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<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">Front. Immunol.</journal-id>
<journal-title>Frontiers in Immunology</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. Immunol.</abbrev-journal-title>
<issn pub-type="epub">1664-3224</issn>
<publisher>
<publisher-name>Frontiers Media S.A.</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.3389/fimmu.2024.1325868</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Immunology</subject>
<subj-group>
<subject>Original Research</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>Association of autoimmune and allergic diseases with senile cataract: a bidirectional two-sample Mendelian randomization study</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Yuan</surname><given-names>Weichen</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<xref ref-type="aff" rid="aff2"><sup>2</sup></xref>
<uri xlink:href="https://loop.frontiersin.org/people/2665660"/>
<role content-type="https://credit.niso.org/contributor-roles/writing-original-draft/"/>
<role content-type="https://credit.niso.org/contributor-roles/software/"/>
<role content-type="https://credit.niso.org/contributor-roles/formal-analysis/"/>
<role content-type="https://credit.niso.org/contributor-roles/conceptualization/"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Li</surname><given-names>Xiangrui</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<xref ref-type="aff" rid="aff2"><sup>2</sup></xref>
<role content-type="https://credit.niso.org/contributor-roles/writing-original-draft/"/>
<role content-type="https://credit.niso.org/contributor-roles/visualization/"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Wang</surname><given-names>Guan</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<xref ref-type="aff" rid="aff2"><sup>2</sup></xref>
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</contrib>
<contrib contrib-type="author" equal-contrib="yes" corresp="yes">
<name>
<surname>Qu</surname><given-names>Bo</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<xref ref-type="aff" rid="aff2"><sup>2</sup></xref>
<xref ref-type="author-notes" rid="fn001"><sup>*</sup></xref>
<role content-type="https://credit.niso.org/contributor-roles/writing-review-editing/"/>
<role content-type="https://credit.niso.org/contributor-roles/supervision/"/>
</contrib>
<contrib contrib-type="author" equal-contrib="yes" corresp="yes">
<name>
<surname>Zhao</surname><given-names>Fangkun</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<xref ref-type="aff" rid="aff2"><sup>2</sup></xref>
<xref ref-type="author-notes" rid="fn001"><sup>*</sup></xref>
<uri xlink:href="https://loop.frontiersin.org/people/2391788"/>
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<aff id="aff1"><sup>1</sup><institution>Department of Ophthalmology, The Fourth Affiliated Hospital of China Medical University</institution>, <addr-line>Shenyang</addr-line>, <country>China</country></aff>
<aff id="aff2"><sup>2</sup><institution>Key Lens Research Laboratory of Liaoning Province</institution>, <addr-line>Shenyang</addr-line>, <country>China</country></aff>
<author-notes>
<fn fn-type="edited-by">
<p>Edited by: Kai Jin, Zhejiang University, China</p>
</fn>
<fn fn-type="edited-by">
<p>Reviewed by: Xin Ye, Zhejiang Provincial People's Hospital, China</p>
<p>Yao Tan, Jinan University, China</p>
</fn>
<fn fn-type="corresp" id="fn001">
<p>*Correspondence: Fangkun Zhao, <email xlink:href="mailto:fkzhao@cmu.edu.cn">fkzhao@cmu.edu.cn</email>; Bo Qu, <email xlink:href="mailto:qubo@cmu.edu.cn">qubo@cmu.edu.cn</email>
</p>
</fn>
</author-notes>
<pub-date pub-type="epub">
<day>22</day>
<month>03</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="collection">
<year>2024</year>
</pub-date>
<volume>15</volume>
<elocation-id>1325868</elocation-id>
<history>
<date date-type="received">
<day>22</day>
<month>10</month>
<year>2023</year>
</date>
<date date-type="accepted">
<day>19</day>
<month>02</month>
<year>2024</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#xa9; 2024 Yuan, Li, Wang, Qu and Zhao</copyright-statement>
<copyright-year>2024</copyright-year>
<copyright-holder>Yuan, Li, Wang, Qu and Zhao</copyright-holder>
<license xlink:href="http://creativecommons.org/licenses/by/4.0/">
<p>This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.</p>
</license>
</permissions>
<abstract>
<sec>
<title>Background</title>
<p>Many observational studies have been reported that patients with autoimmune or allergic diseases seem to have a higher risk of developing senile cataract, but the views are not consistent. In order to minimize the influence of reverse causality and potential confounding factors, we performed Mendelian Randomization (MR) analysis to investigate the genetic causal associations between autoimmune, allergic diseases and senile cataract.</p>
</sec>
<sec>
<title>Methods</title>
<p>Single nucleotide polymorphisms associated with ten common autoimmune and allergic diseases were obtained from the IEU Open genome-wide association studies (GWAS) database. Summary-level GWAS statistics for clinically diagnosed senile cataract were obtained from the FinnGen research project GWAS, which consisted of 59,522 individuals with senile cataracts and 312,864 control individuals. MR analysis was conducted using mainly inverse variance weighted (IVW) method and further sensitivity analysis was performed to test robustness.</p>
</sec>
<sec>
<title>Results</title>
<p>As for ten diseases, IVW results confirmed that type 1 diabetes (OR = 1.06; 95% CI = 1.05-1.08; <italic>p</italic> = 2.24&#xd7;10<sup>-12</sup>), rheumatoid arthritis (OR = 1.05; 95% CI = 1.02-1.08; <italic>p</italic> = 1.83&#xd7;10<sup>-4</sup>), hypothyroidism (OR = 2.4; 95% CI = 1.42-4.06; <italic>p</italic> = 1.12&#xd7;10<sup>-3</sup>), systemic lupus erythematosus (OR = 1.02; 95% CI = 1.01-1.03; <italic>p</italic> = 2.27&#xd7;10<sup>-3</sup>), asthma (OR = 1.02; 95% CI = 1.01-1.03; <italic>p</italic> = 1.2&#xd7;10<sup>-3</sup>) and allergic rhinitis (OR = 1.07; 95% CI = 1.02-1.11; <italic>p</italic> = 2.15&#xd7;10<sup>-3</sup>) were correlated with the risk of senile cataract. Celiac disease (OR = 1.04; 95% CI = 1.01-1.08; <italic>P</italic> = 0.0437) and atopic dermatitis (OR = 1.05; 95% CI = 1.01-1.10; <italic>P</italic> = 0.0426) exhibited a suggestive connection with senile cataract after Bonferroni correction. These associations are consistent across weighted median and MR Egger methods, with similar causal estimates in direction and magnitude. Sensitivity analysis further proved that these associations were reliable.</p>
</sec>
<sec>
<title>Conclusions</title>
<p>The results of the MR analysis showed that there were causal relationships between type 1 diabetes, rheumatoid arthritis, hypothyroidism, systemic lupus erythematosus, asthma, allergic rhinitis and senile cataract. To clarify the possible role of autoimmune and allergy in the pathophysiology of senile cataract, further studies are needed.</p>
</sec>
</abstract>
<kwd-group>
<kwd>autoimmune diseases</kwd>
<kwd>allergy</kwd>
<kwd>Mendelian randomization</kwd>
<kwd>senile cataract</kwd>
<kwd>GWAS - genome-wide association study</kwd>
</kwd-group>
<counts>
<fig-count count="5"/>
<table-count count="2"/>
<equation-count count="0"/>
<ref-count count="70"/>
<page-count count="11"/>
<word-count count="4585"/>
</counts>
<custom-meta-wrap>
<custom-meta>
<meta-name>section-in-acceptance</meta-name>
<meta-value>Autoimmune and Autoinflammatory Disorders : Autoimmune Disorders</meta-value>
</custom-meta>
</custom-meta-wrap>
</article-meta>
</front>
<body>
<sec id="s1" sec-type="intro">
<title>Introduction</title>
<p>Senile cataract, also known as age-related cataract, is one of the leading causes of treatable blindness in the world, affecting 17% of the global population (<xref ref-type="bibr" rid="B1">1</xref>). Senile cataract is the most common type of cataract among adults, with onset between ages of 45 and 50. Even with the rapid development of cataract surgery, senile cataract still causes a huge disease and economic burden, especially in developing countries (<xref ref-type="bibr" rid="B2">2</xref>). Identifying potential risk factors to determine the mechanism of cataract formation and preventive methods is therefore of paramount importance. Currently, risk factors such as ageing, smoking, alcohol consumption, hypertension, and diabetes have been proved to contribute to the occurrence of cataract (<xref ref-type="bibr" rid="B3">3</xref>&#x2013;<xref ref-type="bibr" rid="B7">7</xref>). However, the influence of immune related diseases as risk factors on cataract is not well studied.</p>
<p>Protecting the host from infection is the primary function of the immune system. The inability to distinguish self from non-self is often referred to as a breach of tolerance and is the underlying mechanism for autoimmune disease. The overall prevalence of autoimmune diseases in the general population is in the range of 3-5% (<xref ref-type="bibr" rid="B8">8</xref>). There are almost 100 different types of autoimmune diseases, the most common of which are autoimmune thyroid disease and type 1 diabetes (T1D) (<xref ref-type="bibr" rid="B9">9</xref>). The incidence of allergic diseases, represented by asthma, atopic dermatitis (AD) and allergic rhinitis (AR) , has increased dramatically in the past three decades, and now affects approximately 20% of the population, becoming a public health problem that imposes a heavy burden on society (<xref ref-type="bibr" rid="B10">10</xref>). Evidence from previous observational studies suggests that some autoimmune and allergic diseases, such as celiac disease (CeD) (<xref ref-type="bibr" rid="B11">11</xref>), systemic lupus erythematosus (SLE) (<xref ref-type="bibr" rid="B12">12</xref>), T1D (<xref ref-type="bibr" rid="B13">13</xref>), multiple sclerosis (MS) (<xref ref-type="bibr" rid="B14">14</xref>), psoriasis (<xref ref-type="bibr" rid="B15">15</xref>), asthma (<xref ref-type="bibr" rid="B16">16</xref>) and AR (<xref ref-type="bibr" rid="B17">17</xref>) may increase the risk of cataracts. These observational studies tend to be susceptible to selection bias, residual confounders and reverse causation. Thus, assessing the causal relationship between autoimmune and allergic diseases and the development of senile cataract can provide clues for the etiology of senile cataract.</p>
<p>Mendelian randomization (MR), as an epidemiological approach, has been widely used to evaluate the potential causal association between exposures and disease results (<xref ref-type="bibr" rid="B18">18</xref>). This approach minimizes residual confounding because genetic variants are randomly assembled at the time of conception and are therefore independent of personal lifestyle and environmental factors (<xref ref-type="bibr" rid="B19">19</xref>). At the same time, the interference of reverse causality can also be avoided (<xref ref-type="bibr" rid="B20">20</xref>). Compared with the gold standard randomized controlled trial (RCT) that established causality, MR used data from large-scale GWAS which is timelier and the sample size is larger. In addition, sometimes randomized controlled trials cannot be conducted because they are costly, unfair, and even unethical. MR studies can overcome these shortcomings while results are broadly consistent with RCTs (<xref ref-type="bibr" rid="B21">21</xref>).</p>
<p>Lens epithelial cells are the most active metabolic cells in the lens, which undergo oxidation, insolubility and cross-linking during cataract formation. These cells then migrate to the lens equator to form lens fibers, which are gradually compressed in the center, resulting in hardening and opacity of the lens nucleus (<xref ref-type="bibr" rid="B22">22</xref>). The pathophysiological mechanism of lens opacity in cataract is usually attributed to oxidative stress (<xref ref-type="bibr" rid="B23">23</xref>). Studies on the mechanisms of autoimmunity or allergy in patients with cataract are not common and have only been reported in a few publications (<xref ref-type="bibr" rid="B24">24</xref>&#x2013;<xref ref-type="bibr" rid="B26">26</xref>). It is still unclear whether autoimmune, allergic diseases and senile cataract are linked through a shared genetic etiology. To our knowledge, there are currently no MR study evaluating the association between autoimmunity, allergic disease and senile cataract. Through this study, it is possible for us to reveal the genetic characteristics and immune related biological processes associated with senile cataract, bridging the significant knowledge gap about the complex causes of this disease.</p>
</sec>
<sec id="s2">
<title>Methods</title>
<sec id="s2_1">
<title>MR assumptions and study design</title>
<p>T1D, rheumatoid arthritis (RA), hypothyroidism, SLE, CeD, MS, psoriasis, asthma, AR and atopic dermatitis (AD) included in our study were determined according to previously published observational studies. In order to assess the causal connections between senile cataract and these diseases, we conducted a two-sample MR analysis. Summary-level data from the GWASs were obtained for autoimmune, allergic diseases and senile cataract. In order to obtain reliable results, the MR analysis meets the following three assumptions (1) instrumental variables (IVs) finally included in the use must be closely related to autoimmune or allergic diseases; (2) IVs and confounding factors (affecting autoimmune, allergic diseases and senile cataract) were independent of each other; (3) IVs only affect senile cataract only through autoimmune or allergic disease. <xref ref-type="fig" rid="f1"><bold>Figure&#xa0;1</bold></xref> shows the flow chart of MR research between autoimmune, allergic diseases and senile cataract and three MR assumptions. To minimize bias due to ethnic stratification, we restricted included individuals to European population.</p>
<fig id="f1" position="float">
<label>Figure&#xa0;1</label>
<caption>
<p>The flow chart of MR research and three MR assumptions.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fimmu-15-1325868-g001.tif"/>
</fig>
</sec>
<sec id="s2_2">
<title>Exposure sources of autoimmune and allergic diseases</title>
<p>Summary level data for all 10 exposures were obtained from Integrative Epidemiology Unit (IEU) Open GWAS database (<ext-link ext-link-type="uri" xlink:href="https://gwas.mrcieu.ac.uk/">https://gwas.mrcieu.ac.uk/</ext-link>). We prioritized using the GWAS dataset with the largest samples size as exposures. If any of the following three situations occur, we will select other relatively large GWAS data: 1) insufficient instrumental variables; 2) racial differences or sample overlap; 3) significant pleiotropy in preliminary analysis. Ultimately, summary GWAS data for hypothyroidism and psoriasis were from UK Biobank. The GWAS summary data for T1D (<xref ref-type="bibr" rid="B27">27</xref>), RA (<xref ref-type="bibr" rid="B28">28</xref>), CeD (<xref ref-type="bibr" rid="B29">29</xref>), SLE (<xref ref-type="bibr" rid="B30">30</xref>), MS (<xref ref-type="bibr" rid="B31">31</xref>), asthma (<xref ref-type="bibr" rid="B32">32</xref>), AR (<xref ref-type="bibr" rid="B33">33</xref>) and AD (<xref ref-type="bibr" rid="B34">34</xref>) were abstracted from different publicly available GWASs. Detailed information for the data sources was presented in <xref ref-type="table" rid="T1"><bold>Table&#xa0;1</bold></xref>.</p>
<table-wrap id="T1" position="float">
<label>Table&#xa0;1</label>
<caption>
<p>Sources and characteristics of exposure.</p>
</caption>
<table frame="hsides">
<thead>
<tr>
<th valign="top" align="center">Exposure</th>
<th valign="top" align="center">GWAS-ID</th>
<th valign="top" align="center">Author, Journal/Consortium</th>
<th valign="top" align="center">Sample size</th>
<th valign="top" align="center">PMID</th>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="center">Type 1 diabetes</td>
<td valign="top" align="center">ebi-a-GCST90018925</td>
<td valign="top" align="center">Sakaue et&#xa0;al., Nat. Genet.</td>
<td valign="top" align="center">457,695</td>
<td valign="top" align="center">34594039</td>
</tr>
<tr>
<td valign="top" align="center">Rheumatoid arthritis</td>
<td valign="top" align="center">ebi-a-GCST005569</td>
<td valign="top" align="center">Eyre et&#xa0;al., Nat. Genet.</td>
<td valign="top" align="center">47,580</td>
<td valign="top" align="center">23143596</td>
</tr>
<tr>
<td valign="top" align="center">Hypothyroidism</td>
<td valign="top" align="center">ukb-a-77</td>
<td valign="top" align="center">UK Biobank</td>
<td valign="top" align="center">337,159</td>
<td valign="top" align="center">NA</td>
</tr>
<tr>
<td valign="top" align="center">Systemic lupus erythematosus</td>
<td valign="top" align="center">ebi-a-GCST003156</td>
<td valign="top" align="center">Bentham et&#xa0;al., Nat. Genet.</td>
<td valign="top" align="center">14,267</td>
<td valign="top" align="center">26502338</td>
</tr>
<tr>
<td valign="top" align="center">Celiac disease</td>
<td valign="top" align="center">ieu-a-1060</td>
<td valign="top" align="center">Dubios et&#xa0;al., Nat. Genet.</td>
<td valign="top" align="center">11,950</td>
<td valign="top" align="center">20190752</td>
</tr>
<tr>
<td valign="top" align="center">Multiple sclerosis</td>
<td valign="top" align="center">ebi-a-GCST001198</td>
<td valign="top" align="center">Sawcer et&#xa0;al., Nature</td>
<td valign="top" align="center">26,621</td>
<td valign="top" align="center">21833088</td>
</tr>
<tr>
<td valign="top" align="center">Psoriasis</td>
<td valign="top" align="center">ukb-a-100</td>
<td valign="top" align="center">UK Biobank</td>
<td valign="top" align="center">337,159</td>
<td valign="top" align="center">NA</td>
</tr>
<tr>
<td valign="top" align="center">Asthma</td>
<td valign="top" align="center">ebi-a-GCST90014325</td>
<td valign="top" align="center">Valette et&#xa0;al., Commun Biol.</td>
<td valign="top" align="center">408,442</td>
<td valign="top" align="center">34103634</td>
</tr>
<tr>
<td valign="top" align="center">Allergic rhinitis</td>
<td valign="top" align="center">ebi-a-GCST90013920</td>
<td valign="top" align="center">Mbatchou et&#xa0;al., Nat. Genet.</td>
<td valign="top" align="center">407,746</td>
<td valign="top" align="center">34017140</td>
</tr>
<tr>
<td valign="top" align="center">Atopic dermatitis</td>
<td valign="top" align="center">ebi-a-GCST90027161</td>
<td valign="top" align="center">Sliz et&#xa0;al., J Allery Clin Immunol.</td>
<td valign="top" align="center">796,661</td>
<td valign="top" align="center">34454985</td>
</tr>
</tbody>
</table>
</table-wrap>
<p>A quality check of the single nucleotide polymorphisms (SNPs) is performed to meet the basic assumptions of MR: (1) SNPs associated with autoimmune diseases reached the genome-wide significance threshold (P&lt;5&#xd7;10<sup>-8</sup>). (2) We further clumped the SNPs in linkage disequilibrium (LD) analysis (R<sup>2</sup> &lt; 0.001, clumping distance = 10,000kb). (3) The palindromic SNPs with intermediate allele frequencies were eliminated. (4) When the original SNP was not available, proxy SNPs with r<sup>2</sup> &gt; 0.9 according to LD link (<ext-link ext-link-type="uri" xlink:href="https://ldlink.nci.nih.gov/">https://ldlink.nci.nih.gov/</ext-link>) were used. To ensure robust associations between instrumental and endogenous variables and to prevent weak instrumental variable bias, we calculated <italic>R</italic><sup>2</sup> [<italic>R</italic><sup>2</sup>&#x2009;=&#x2009;2&#x2009;&#xd7;&#x2009;EAF&#x2009;&#xd7;&#x2009;(1&#x2009;&#x2212;&#x2009;EAF)&#x2009;&#xd7;&#x2009;<italic>b</italic><sup>2</sup>], representing the proportion of variation explained by instrumental variable SNPs. Simultaneously, we performed calculations of the F-statistic [<italic>F</italic>&#x2009;=&#x2009;<italic>R</italic><sup>2</sup>&#x2009;&#xd7;&#x2009;(<italic>N</italic>&#x2009;&#x2212;&#x2009;2) / (1&#x2009;&#x2212;&#x2009;<italic>R</italic><sup>2</sup>)] to assess the potency of IVs, whereby IVs with an F-statistic exceeding 10 are deemed to be valid (<xref ref-type="bibr" rid="B35">35</xref>).</p>
</sec>
<sec id="s2_3">
<title>Outcome sources of senile cataract</title>
<p>To reduce bias due to sample overlap, the summary statistics for the senile cataract GWAS were selected from the FinnGen research project (<ext-link ext-link-type="uri" xlink:href="https://r9.finngen.fi/">https://r9.finngen.fi/</ext-link>), including 59,522 cases of senile cataracts and 312,864 cases of population controls. This study defines senile cataract by H25 of the International Classification of Disease-10 (<xref ref-type="bibr" rid="B36">36</xref>).</p>
<p>All analyses were based on publicly shared databases and no additional ethical approvals were required.</p>
</sec>
<sec id="s2_4">
<title>Statistical analysis</title>
<sec id="s2_4_1">
<title>MR analysis</title>
<p>The &#x201c;TwoSampleMR&#x201d; R package (version 0.5.7) was used for bidirectional univariable two-sample MR analysis between autoimmune, allergic diseases and senile cataract. Inverse variance weighted (IVW) methods were applied to evaluate the causality between autoimmune, allergic disease-related IVs and senile cataract risk, as the IVW approach is most effective in terms of statistical power when all IVs were valid and there is no horizontal pleiotropy (<xref ref-type="bibr" rid="B37">37</xref>). Cochrane's Q test was applied to test whether heterogeneity existed, and if so, an IVW random-effects model was used, otherwise an IVW fixed-effects model was used. The effect size is indicated by the odds ratio (OR) along with its 95% confidence interval (CI). However, even if only one genetic variation is invalid, the IVW method may provide biased estimates. In order to solve the robustness, two other methods are carried out, including weighted median (WM) method and MR-Egger test. WM gives a reliable estimate assuming that no less than 50% of the IVs are valid (<xref ref-type="bibr" rid="B35">35</xref>). The results of MR Egger remain valid when SNPs with pleiotropy were more than 50% (<xref ref-type="bibr" rid="B38">38</xref>).</p>
</sec>
<sec id="s2_4_2">
<title>Sensitivity analysis</title>
<p>If genetic variants have horizontal pleiotropy, our IVW results will be invalidated. Intercept terms obtained from the MR-Egger regression were used to evaluate imbalanced pleiotropic effects (<xref ref-type="bibr" rid="B39">39</xref>). The MR-Egger estimate would be equal to the IVW estimate if the intercept term was zero and the test <italic>p</italic>-value is greater than 0.05. The MR pleiotropy residual sum and outlier (MR-PRESSO) method (R package &#x201c;MR-PRESSO&#x201d; v1.0) can also detect the outliers that may possess the characteristic of horizontal pleiotropy and provide corrected estimates after removing outliers (<xref ref-type="bibr" rid="B40">40</xref>). Cochrane's Q test was used to test heterogeneity (<xref ref-type="bibr" rid="B41">41</xref>). If heterogeneity exists, we will use IVW random-effects model to calculate the main results. Leave-one-out analysis is conducted to assess the sensitivity of results to individual variants by sequentially excluding one SNP at a time to estimate whether results are biased or driven by individual SNPs (<xref ref-type="bibr" rid="B42">42</xref>). In order to reduce false positive rate in batch analysis, we use Bonferroni method for multiple testing. The threshold for statistical significance was defined as a <italic>p</italic>-value &lt;5&#xd7;10<sup>-3</sup> (<italic>p</italic> =0.05 / (ten exposures &#xd7; one outcome) adjusted for ten exposures and one outcome using the Bonferroni method. A p-value ranging from 0.005 to 0.05 was deemed to indicate suggestive significance.</p>
</sec>
</sec>
</sec>
<sec id="s3" sec-type="results">
<title>Results</title>
<sec id="s3_1">
<title>Selection of IVs associated with autoimmune diseases</title>
<p>In this study, we reported our MR analysis according to STROBE-MR (Strengthening the Reporting of Mendelian Randomization Studies) guidelines to improve the clarity, transparency and reproducibility of the study (<xref ref-type="supplementary-material" rid="ST1"><bold>Supplementary Table S1</bold></xref>).</p>
<p>The number of SNPs ranged from 7 to 117, after quality control steps by LD effects and palindromic. The F-statistic of SNPs ranges from 29.4 to 2815.2, indicating that each SNP revealed adequate validity. The detailed information for each SNP and its R<sup>2</sup> and F-statistic value were shown in <xref ref-type="supplementary-material" rid="ST2"><bold>Supplementary Table S2</bold></xref>.</p>
</sec>
<sec id="s3_2">
<title>MR analysis</title>
<p>IVW analysis showed that T1D (OR = 1.06; 95% CI = 1.05-1.08; <italic>p</italic> = 2.24&#xd7;10<sup>-12</sup>), RA (OR = 1.05; 95% CI = 1.02-1.08; <italic>p</italic> = 1.83&#xd7;10<sup>-4</sup>), hypothyroidism (OR = 2.4; 95% CI = 1.42-4.06; <italic>p</italic> = 1.12&#xd7;10<sup>-3</sup>), SLE (OR = 1.02; 95% CI = 1.01-1.03; <italic>p</italic> = 2.27&#xd7;10<sup>-3</sup>), asthma (OR=1.07; 95% CI = 1.03-1.12; <italic>p</italic> = 1.2&#xd7;10<sup>-3</sup>) and AR (OR = 1.07; 95% CI = 1.02-1.11; <italic>p</italic> = 2.15&#xd7;10<sup>-3</sup>) were causally associated with a significantly increased risk of senile cataract in European populations. CeD (OR = 1.04; 95% CI = 1.01-1.08; <italic>P</italic> = 0.0437) and AD (OR = 1.05; 95% CI = 1.01-1.10; <italic>P</italic> = 0.0426) exhibits a suggestive connection with senile cataract after Bonferroni correction. There was insufficient evidence to suggest that genetically predicted MS (OR = 1.01, 95% CI = 0.98-1.04; <italic>P</italic> = 0.45) and psoriasis (OR = 0.18; 95% CI =0.03-1.1; <italic>P</italic> =0.443) were associated with senile cataracts. These associations are consistent across WM and MR Egger methods, with similar causal estimates in direction and magnitude (<xref ref-type="fig" rid="f2"><bold>Figure&#xa0;2</bold></xref>).</p>
<fig id="f2" position="float">
<label>Figure&#xa0;2</label>
<caption>
<p>Mendelian randomization estimates from instrument variants for autoimmune and allergic diseases on risk of senile cataract.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fimmu-15-1325868-g002.tif"/>
</fig>
<p>No genetic predisposition to any of the 10 diseases was associated with senile cataract in the inverse analysis with IVs to senile cataract as exposure and the 10 diseases as outcomes (<xref ref-type="fig" rid="f3"><bold>Figure&#xa0;3</bold></xref>).</p>
<fig id="f3" position="float">
<label>Figure&#xa0;3</label>
<caption>
<p>Mendelian randomization estimates from instrument variants for senile cataract on risk of autoimmune and allergic diseases.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fimmu-15-1325868-g003.tif"/>
</fig>
</sec>
<sec id="s3_3">
<title>Sensitivity analysis</title>
<p>Sensitivity analyses were performed to check the reliability of the IVW results. The effect of pleiotropy of exposures may be negligible given the intercept value, as no evidence of directional pleiotropy was found in the MR-Egger regression analysis (<italic>p</italic>&gt;0.05) (<xref ref-type="table" rid="T2"><bold>Table&#xa0;2</bold></xref>). Cochrane's Q test showed that there was heterogeneity in MR analysis results between RA, hypothyroidism, SLE, psoriasis, asthma, AR with senile cataract (<italic>p&lt;</italic>0.05) (<xref ref-type="table" rid="T2"><bold>Table&#xa0;2</bold></xref>). When the number of IVs is large, the existence of heterogeneity is unavoidable. Since we used random effects IVW as the primary analysis method, heterogeneity is acceptable and does not affect the estimation of causality (<xref ref-type="bibr" rid="B43">43</xref>). The MR-PRESSO test suggested that there were horizontal pleiotropic outliers for RA, hypothyroidism, MS, psoriasis and AR. The outliers-corrected results were shown in <xref ref-type="fig" rid="f2"><bold>Figure&#xa0;2</bold></xref>. The results show that removing outliers did not affect the causal relationships implied by the main IVW results. Leave-one-out analysis results show that all SNPs are evenly distributed on the side of 0. It seems that no SNPs can strongly promote the overall effect of each exposure on senile cataract. The visualized scatter plots and Leave-one-out plots are shown in <xref ref-type="fig" rid="f4"><bold>Figures&#xa0;4</bold></xref>, <xref ref-type="fig" rid="f5"><bold>5</bold></xref>.</p>
<table-wrap id="T2" position="float">
<label>Table&#xa0;2</label>
<caption>
<p>The results of sensitivity analysis.</p>
</caption>
<table frame="hsides">
<thead>
<tr>
<th valign="middle" align="center">Exposure</th>
<th valign="middle" align="center">MRPRESSO<break/><italic>p</italic>
</th>
<th valign="top" align="center">Heterogeneity<break/><italic>p</italic>
</th>
<th valign="middle" align="center">MR-Egger intercept</th>
<th valign="top" align="center">Pleiotropy<break/><italic>p</italic>
</th>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="center">Type 1 diabetes</td>
<td valign="top" align="center">0.107</td>
<td valign="top" align="center">0.09</td>
<td valign="top" align="center">0.00264</td>
<td valign="top" align="center">0.58</td>
</tr>
<tr>
<td valign="top" align="center">Rheumatoid arthritis</td>
<td valign="top" align="center">0.004*</td>
<td valign="top" align="center">1.18&#xd7;10<sup>-4</sup>*</td>
<td valign="top" align="center">-0.0104</td>
<td valign="top" align="center">0.09</td>
</tr>
<tr>
<td valign="top" align="center">Hypothyroidism</td>
<td valign="top" align="center">&lt;0.001*</td>
<td valign="top" align="center">5.27&#xd7;10<sup>-6</sup>*</td>
<td valign="top" align="center">0.00135</td>
<td valign="top" align="center">0.66</td>
</tr>
<tr>
<td valign="top" align="center">Systemic lupus erythematosus</td>
<td valign="top" align="center">0.053</td>
<td valign="top" align="center">0.04*</td>
<td valign="top" align="center">-0.00398</td>
<td valign="top" align="center">0.35</td>
</tr>
<tr>
<td valign="top" align="center">Celiac disease</td>
<td valign="top" align="center">0.219</td>
<td valign="top" align="center">0.174</td>
<td valign="top" align="center">-0.0395</td>
<td valign="top" align="center">0.29</td>
</tr>
<tr>
<td valign="top" align="center">Multiple sclerosis</td>
<td valign="top" align="center">0.048*</td>
<td valign="top" align="center">0.06</td>
<td valign="top" align="center">0.00186</td>
<td valign="top" align="center">0.86</td>
</tr>
<tr>
<td valign="top" align="center">Psoriasis</td>
<td valign="top" align="center">0.021*</td>
<td valign="top" align="center">4.17&#xd7;10<sup>-4</sup>*</td>
<td valign="top" align="center">-0.000765</td>
<td valign="top" align="center">0.14</td>
</tr>
<tr>
<td valign="top" align="center">Asthma</td>
<td valign="top" align="center">0.71</td>
<td valign="top" align="center">1.17&#xd7;10<sup>-3</sup>*</td>
<td valign="top" align="center">0.000269</td>
<td valign="top" align="center">0.94</td>
</tr>
<tr>
<td valign="top" align="center">Allergic rhinitis</td>
<td valign="top" align="center">&lt;0.001*</td>
<td valign="top" align="center">2.76&#xd7;10<sup>-5</sup>*</td>
<td valign="top" align="center">0.000518</td>
<td valign="top" align="center">0.85</td>
</tr>
<tr>
<td valign="top" align="center">Atopic dermatitis</td>
<td valign="top" align="center">0.915</td>
<td valign="top" align="center">0.906</td>
<td valign="top" align="center">0.00609</td>
<td valign="top" align="center">0.69</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn>
<p>MRPRESSO, MR pleiotropy residual sum and outlier; IVW, inverse variance weighted.</p>
</fn>
<fn>
<p>*p&lt;0.05 was considered statistically significant.</p>
</fn>
</table-wrap-foot>
</table-wrap>
<fig id="f4" position="float">
<label>Figure&#xa0;4</label>
<caption>
<p>Scatter plots show the MR effect of each exposure on senile cataract in different MR methods. <bold>(A)</bold> Type 1 diabetes on senile cataract. <bold>(B)</bold> Rheumatoid arthritis on senile cataract. <bold>(C)</bold> Hypothyroidism on senile cataract. <bold>(D)</bold> Systemic lupus erythematosus on senile cataract. <bold>(E)</bold> Celiac disease on senile cataract. <bold>(F)</bold> Asthma on senile cataract. <bold>(G)</bold> Allergic rhinitis on senile cataract. <bold>(H)</bold> Allergic dermatitis on senile cataract.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fimmu-15-1325868-g004.tif"/>
</fig>
<fig id="f5" position="float">
<label>Figure&#xa0;5</label>
<caption>
<p>Leave-one-out plots of the causal relationships between autoimmune, allergic diseases and senile cataract. <bold>(A)</bold> Type 1 diabetes on senile cataract. <bold>(B)</bold> Rheumatoid arthritis on senile cataract. <bold>(C)</bold> Hypothyroidism on senile cataract. <bold>(D)</bold> Systemic lupus erythematosus on senile cataract. <bold>(E)</bold> Celiac disease on senile cataract. <bold>(F)</bold> Asthma on senile cataract. <bold>(G)</bold> Allergic rhinitis on senile cataract. <bold>(H)</bold> Allergic dermatitis on senile cataract.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fimmu-15-1325868-g005.tif"/>
</fig>
</sec>
</sec>
<sec id="s4" sec-type="discussion">
<title>Discussion</title>
<p>In our study, a comprehensive bidirectional two-sample MR study was performed to investigate the causal associations between liabilities to ten diseases and the risk of senile cataract. MR analysis suggested a significant causal relationship between T1D, RA, hypothyroidism, SLE, asthma, AR and senile cataract. To the best of our knowledge, this is the first study to investigate the genetic causal links between autoimmune, allergic disease and senile cataract, making a significant contribution to understanding of the mechanism underlying senile cataract.</p>
<p>As a relatively common autoimmune disease, T1D is charactered by a complete lack of insulin due to the destruction of pancreatic beta cells, and insulin therapy must be given (<xref ref-type="bibr" rid="B44">44</xref>). Wen-Li Lu et&#xa0;al. reported that T1D patients had a higher risk of cataract compared to age- and sex-matched general population using cohort methodology in Taiwan (n=3,622) (<xref ref-type="bibr" rid="B13">13</xref>). Potential pathophysiological mechanisms may involve the aldose reductase pathway, oxidative stress, osmotic damage and autoimmunity (<xref ref-type="bibr" rid="B45">45</xref>). Papadimitriou et&#xa0;al. proposed an autoimmune hypothesis for acute bilateral cataract in T1D (<xref ref-type="bibr" rid="B24">24</xref>). Cataract formation typically occurs within weeks or months of the initiation of insulin therapy, coinciding with the time when insulin autoantibody became positive and the immunoreactivity of insulin receptors in the lens decreases. Further studies are necessary for clarification of these points and possibly for histological evidence of autoimmune processes (<xref ref-type="bibr" rid="B24">24</xref>). RA is a common autoimmune disease associated with hyperplasia of the joint tissues and the inflammation of the synovium, which can eventually lead to several serious systemic diseases, including pulmonary, cardiovascular, skeletal and psychological diseases (<xref ref-type="bibr" rid="B46">46</xref>). Eye diseases such as dry eye, glaucoma are common complications of RA, with a prevalence rate of about 18% (<xref ref-type="bibr" rid="B47">47</xref>). No related reports about RA increasing susceptibility to senile cataract directly were retrieved in PubMed database. However, in the treatment of RA, glucocorticoids (GCs) are commonly used. Posterior subcapsular cataract are known as side effects of long-term use of GCs (<xref ref-type="bibr" rid="B48">48</xref>), but it is still inconclusive whether the risk of cataract will increase during the treatment of RA with GCs (<xref ref-type="bibr" rid="B49">49</xref>). Our MR analysis provided genetic evidence that the onset of RA may increase the genetic susceptibility to cataract (OR=1.05). Primary hypothyroidism is defined by a high thyrotropin concentration along with low thyroid hormone concentrations or concentrations within the reference range. Hypothyroidism is usually an autoimmune disease in adults, which primarily affects middle-aged and elderly females (<xref ref-type="bibr" rid="B50">50</xref>). Limin Wei et&#xa0;al. published a case report that an East Asian 19-year-old male with Klinefelter Syndrome presenting cleft palate, hypothyroidism, cataract, and diabetes (<xref ref-type="bibr" rid="B51">51</xref>). This patient did not have congenital cataract because they were not diagnosed in infancy. Therefore, it is inferred that the formation of cataract in this patient may be related to hypothyroidism or diabetes, and there may be a potential genetic relationship between these diseases (<xref ref-type="bibr" rid="B51">51</xref>). Our results of MR analysis further verified this conjecture. SLE is a long-lasting autoimmune disease affecting multiple organs. It occurs when there is a failure in the regulation and tolerance of the immune system, affecting both the innate and adaptive immune responses (<xref ref-type="bibr" rid="B52">52</xref>). Cataract is the most prevalent ocular impairment in SLE. According to Alderaan et&#xa0;al., cataract development among patients with SLE is multifactorial and associated with the cumulative prednisone dose equivalent, systolic blood pressure and disease activity (<xref ref-type="bibr" rid="B12">12</xref>). Celiac disease, also known as gluten intolerance, is a condition that affects the small intestine and is characterized by an immune-mediated enteropathy. Ocular disease associated with celiac disease can sometimes be the first sign of the condition (<xref ref-type="bibr" rid="B53">53</xref>). Mollazadegan et&#xa0;al. conducted an European population-based cohort study (n=28756) and identified a moderate increase in the risk of cataract development among individuals diagnosed with biopsy-verified CeD (<xref ref-type="bibr" rid="B11">11</xref>). The cause of the condition has not been fully established, but research suggests that it may be related to a lack of absorption of vitamins and trace elements, dehydration, autoimmune factors and oxidative stress (<xref ref-type="bibr" rid="B11">11</xref>). Above findings supported the results obtained from our MR analyses, indicating that there is a positive association between genetically proxied autoimmune diseases and the risk of senile cataract.</p>
<p>Oxidative stress is the result of the imbalance between oxidant production and antioxidant defense mechanism. Reaction intermediates (free radicals and peroxides) that cannot be eliminated in time can have toxic effects on cellular components such as DNA, proteins, and lipids (<xref ref-type="bibr" rid="B54">54</xref>). The inflammatory response is associated with increased production of reactive oxygen species (ROS) and reactive nitrogen species (RNS), which is a shared characteristic among different autoimmune diseases, including RA, hypothyroidism, T1D, SLE, and others (<xref ref-type="bibr" rid="B55">55</xref>, <xref ref-type="bibr" rid="B56">56</xref>). Lipid peroxidation caused by increased free radicals due to increased oxidative pressure of the lens or decreased ability to remove ROS is also an important pathological mechanism for cataract formation. Oxidative stress and autoimmunity-induced DNA damage, telomerase inhibition, and significant telomere shortening also accelerate aging (<xref ref-type="bibr" rid="B57">57</xref>, <xref ref-type="bibr" rid="B58">58</xref>). Therefore, it can be inferred that the oxidative stress state of patients with autoimmune diseases may increase their susceptibility to senile cataract. A large amount of evidence suggests that autophagy deficiency is related to the development of autoimmunity. Meanwhile, the destruction of autophagy of lens cells can also lead to the loss of anti-stress ability and inhibit differentiation, and eventually lead to the formation of cataract (<xref ref-type="bibr" rid="B59">59</xref>, <xref ref-type="bibr" rid="B60">60</xref>). Ferroptosis is a newly discovered type of iron-dependent programmed cell death characterized by excessive iron accumulation, elevated lipid peroxides, reactive oxygen species, reduced glutathione and glutathione peroxidase levels. A large and emerging literature on ferroptosis demonstrates the critical role of these pathological processes in autoimmune and ocular diseases (<xref ref-type="bibr" rid="B61">61</xref>). In addition, improper degradation of DNA during programmed death may also lead to autoimmune diseases and cataract (<xref ref-type="bibr" rid="B62">62</xref>).</p>
<p>Asthma is a chronic inflammatory disorder involving a large number of cells and cellular elements in the respiratory system (<xref ref-type="bibr" rid="B63">63</xref>). Li et&#xa0;al. found that cataracts had a positive correlation with asthma after adjusting for confounding factors by analyzing nationally representative samples from the National Health Interview Survey (NHIS) (<xref ref-type="bibr" rid="B16">16</xref>). Asthma may be closely related to cataracts through the PI3K-AKT-mTOR signaling pathway. In addition, allergy-induced inflammation or immune dysregulation is also one of the potential mechanisms leading to cataract formation (<xref ref-type="bibr" rid="B26">26</xref>). AR is a chronic inflammatory disease of the upper respiratory tract characterized by sneezing, itching, nasal congestion, and rhinorrhea (<xref ref-type="bibr" rid="B64">64</xref>). A Korean population-based survey reported that people with asthma and AR were more likely to develop senile cataracts but not with AD (<xref ref-type="bibr" rid="B17">17</xref>). Intranasal corticosteroids, a well-established and effective treatment for AR, does not appear to increase the risk of cataract in patients (<xref ref-type="bibr" rid="B65">65</xref>). The association between allergic diseases and cataracts may be attributed to multiple mechanisms, such as having similar risk factors, hypertension, hyperglycemia, etc. Other factors including inflammation and oxidative stress may also increase susceptibility to cataract (<xref ref-type="bibr" rid="B66">66</xref>). Our results showed that there is a suggestive genetic association between AD and senile cataract (p=0.0426). Therefore, as for whether AD increases the risk of senile cataract, based on our MR analysis and previous research results, we cannot determine the causal relationship between them, and further RCT is needed (<xref ref-type="bibr" rid="B17">17</xref>, <xref ref-type="bibr" rid="B67">67</xref>).</p>
<p>A cause-and-effect relationship between the risk of senile cataract and MS, psoriasis could not be established in our study. Classified as an organ-specific, T-cell-mediated autoimmune disease, MS is the most common disabling disease in young adults that is not caused by physical trauma (<xref ref-type="bibr" rid="B68">68</xref>). A European population-based cohort study (n = 39,444) showing MS patients under the age of 50, especially young men, are at higher risk of developing cataract, compared with healthy controls (<xref ref-type="bibr" rid="B14">14</xref>). This result is contrary to the results of our MR analysis that there is no causal relationship between MS and the onset of cataract. Compared to observational studies, our MR study results are more compelling due to its ability to reduce confounding factors and reverse-causal association bias to some extent. Nonetheless, more advanced RCTs should be designed to confirm the causal association between the two diseases. Psoriasis, a polygenic disease characterized by erythematous plaques with silvery scales, is a chronic inflammatory autoimmune skin disorder affecting 1-3% of the world's population (<xref ref-type="bibr" rid="B69">69</xref>). Fuying Chen and colleagues have identified a new condition called the CAOP syndrome, which involves cataracts, alopecia, oral mucosal disorders and psoriasis-like symptoms (<xref ref-type="bibr" rid="B70">70</xref>). Contrary to our results, a population-based cohort by Chun-Yu Cheng has been observed a positive correlation between psoriasis and cataract. The common pathogenesis of cataract and psoriasis may be related to interleukin-6, C-reactive protein, intracellular adhesion molecule- 1, oxidative stress and so on (<xref ref-type="bibr" rid="B15">15</xref>). These differences in causality may be due to potential confounding factors, such as steroid hormone use and ultraviolet radiation, because observational studies are difficult to escape the influence of confounding factors. Therefore, there is likely no causal relationship between psoriasis and senile cataract based on MR analysis.</p>
<p>Senile cataract, as a reversible blinding eye disease with a high incidence rate, has caused great damage to labor productivity and brought a heavy economic burden around the world, especially in developing countries with in adequate surgical facilities. Understanding which factors increase the risk of cataracts can help identify high-risk individuals. Through the findings of this paper, people with autoimmune diseases should have regular anterior segment examinations through slit lamp microscopy while actively treating the primary disease, which will help ophthalmologists formulate preventive strategies in real time or select the most appropriate time for surgical treatment.</p>
<p>The main strength of our study is that we conducted an MR analysis and explored the genetic causal relationship between autoimmune, allergic diseases and the risk of senile cataract for the first time. Furthermore, various techniques were employed to perform sensitivity analysis, identifying outliers and correcting any potential pleiotropy and heterogeneity. With the increasing availability of a large amount of genetic data, the extension of GWAS may achieve early prediction of senile cataract and make it possible to achieve genetic-based treatment. The current study also has several limitations. Firstly, we used conventional methods that outcomes data were obtained from the FinnGen database and exposures data were obtained from other GWASs study on European ancestry in IEU Open GWAS database to reduce sample overlap. However, it is difficult to determine whether overlapping subjects were included in our MR analysis. Secondly, there is a possibility that a complete identification of all SNPs linked to these diseases was not achieved. By utilizing a restricted number of SNPs to establish the causal associations, it is possible that the statistical power of certain analyses may have been diminished. Thirdly, there may be potential confounding factors, such as the use of steroid hormone mediating the causality of autoimmune diseases on cataract, but due to the limitations of GWAS, we are not yet able to perform multivariate MR and mediation analysis. Last but not least, the data related to autoimmune, allergic diseases and senile cataracts were mostly from European ancestry. The results of our study should not be directly generalized to other ethnic groups.</p>
</sec>
<sec id="s5" sec-type="conclusion">
<title>Conclusion</title>
<p>In summary, our current findings provide strong genetic evidence in support of the causal relationship among type 1 diabetes, rheumatoid arthritis, hypothyroidism, systemic lupus erythematosus, asthma, allergic rhinitis and senile cataract in a European population. Our study confirms previous observational studies, suggesting that autoimmune and allergy processes may be risk factors of senile cataract. The results of this study suggest that patients with autoimmune or allergy diseases should pay attention to the prevention and treatment of senile cataract and further studies are needed to clarify the potential role of autoimmune and allergy in the pathophysiology of senile cataract.</p>
</sec>
<sec id="s6" sec-type="data-availability">
<title>Data availability statement</title>
<p>The original contributions presented in the study are included in the article/<xref ref-type="supplementary-material" rid="ST1"><bold>Supplementary Material</bold></xref>. Further inquiries can be directed to the corresponding authors.</p>
</sec>
<sec id="s7" sec-type="ethics-statement">
<title>Ethics statement</title>
<p>All analyses were based on publicly shared databases and no additional ethical approvals were required.</p>
</sec>
<sec id="s8" sec-type="author-contributions">
<title>Author contributions</title>
<p>WY: Writing &#x2013; original draft, Software, Formal analysis, Conceptualization. XL: Writing &#x2013; original draft, Visualization. GW: Writing &#x2013; original draft, Resources. BQ: Writing &#x2013; review &amp; editing, Supervision. FZ: Writing &#x2013; review &amp; editing,  Funding acquisition, Investigation, Supervision.</p>
</sec>
</body>
<back>
<sec id="s9" sec-type="funding-information">
<title>Funding</title>
<p>The author(s) declare financial support was received for the research, authorship, and/or publication of this article. This work was supported by grants from Scientific Research Project of Liaoning Provincial Department of Education in 2021 (No. LJKZ0773).</p>
</sec>
<sec id="s10" sec-type="COI-statement">
<title>Conflict of interest</title>
<p>The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.</p>
</sec>
<sec id="s11" sec-type="disclaimer">
<title>Publisher&#x2019;s note</title>
<p>All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.</p>
</sec>
<sec id="s12" sec-type="supplementary-material">
<title>Supplementary material</title>
<p>The Supplementary Material for this article can be found online at: <ext-link ext-link-type="uri" xlink:href="https://www.frontiersin.org/articles/10.3389/fimmu.2024.1325868/full#supplementary-material">https://www.frontiersin.org/articles/10.3389/fimmu.2024.1325868/full#supplementary-material</ext-link>
</p>
<supplementary-material xlink:href="Table_1.docx" id="ST1" mimetype="application/vnd.openxmlformats-officedocument.wordprocessingml.document"/>
<supplementary-material xlink:href="Table_2.xlsx" id="ST2" mimetype="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"/>
</sec>
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