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<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">Front. Cell. Infect. Microbiol.</journal-id>
<journal-title>Frontiers in Cellular and Infection Microbiology</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. Cell. Infect. Microbiol.</abbrev-journal-title>
<issn pub-type="epub">2235-2988</issn>
<publisher>
<publisher-name>Frontiers Media S.A.</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.3389/fcimb.2023.1143950</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Cellular and Infection Microbiology</subject>
<subj-group>
<subject>Original Research</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>
<italic>Schistosoma japonicum</italic>-derived peptide SJMHE1 ameliorates allergic symptoms and responses in mice with allergic rhinitis</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Gao</surname>
<given-names>Xuerong</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author" corresp="yes">
<name>
<surname>Mao</surname>
<given-names>Chaoming</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="author-notes" rid="fn001">
<sup>*</sup>
</xref>
<uri xlink:href="https://loop.frontiersin.org/people/773001"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Zheng</surname>
<given-names>Tingting</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Xu</surname>
<given-names>Xiaowei</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Luo</surname>
<given-names>Xinkai</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Zhang</surname>
<given-names>Shan</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Liu</surname>
<given-names>Jiameng</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Wang</surname>
<given-names>Xuefeng</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/414413"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Chen</surname>
<given-names>Xiaojun</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<uri xlink:href="https://loop.frontiersin.org/people/1507767"/>
</contrib>
<contrib contrib-type="author" corresp="yes">
<name>
<surname>Dong</surname>
<given-names>Liyang</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="author-notes" rid="fn001">
<sup>*</sup>
</xref>
<uri xlink:href="https://loop.frontiersin.org/people/2169061"/>
</contrib>
</contrib-group>
<aff id="aff1">
<sup>1</sup>
<institution>Department of Nuclear Medicine, The Affiliated Hospital of Jiangsu University</institution>, <addr-line>Zhenjiang, Jiangsu</addr-line>, <country>China</country>
</aff>
<aff id="aff2">
<sup>2</sup>
<institution>Department of Central Laboratory, The Affiliated Hospital of Jiangsu University</institution>, <addr-line>Zhenjiang, Jiangsu</addr-line>, <country>China</country>
</aff>
<aff id="aff3">
<sup>3</sup>
<institution>Department of Pathogen Biology &amp; Immunology, Jiangsu Key Laboratory of Pathogen Biology, Nanjing Medical University</institution>, <addr-line>Nanjing, Jiangsu</addr-line>, <country>China</country>
</aff>
<author-notes>
<fn fn-type="edited-by">
<p>Edited by: Anna Zawistowska-Deniziak, Polish Academy of Sciences, Poland</p>
</fn>
<fn fn-type="edited-by">
<p>Reviewed by: Marta Guimar&#xe3;es Cavalanti, Federal University of Rio de Janeiro, Brazil; Hermelijn Helene Smits, Leiden University Medical Center (LUMC), Netherlands</p>
</fn>
<fn fn-type="corresp" id="fn001">
<p>*Correspondence: Chaoming Mao, <email xlink:href="mailto:jq1001@ujs.edu.cn">jq1001@ujs.edu.cn</email>; Liyang Dong, <email xlink:href="mailto:liyangdong@ujs.edu.cn">liyangdong@ujs.edu.cn</email>
</p>
</fn>
</author-notes>
<pub-date pub-type="epub">
<day>06</day>
<month>06</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="collection">
<year>2023</year>
</pub-date>
<volume>13</volume>
<elocation-id>1143950</elocation-id>
<history>
<date date-type="received">
<day>13</day>
<month>01</month>
<year>2023</year>
</date>
<date date-type="accepted">
<day>22</day>
<month>05</month>
<year>2023</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#xa9; 2023 Gao, Mao, Zheng, Xu, Luo, Zhang, Liu, Wang, Chen and Dong</copyright-statement>
<copyright-year>2023</copyright-year>
<copyright-holder>Gao, Mao, Zheng, Xu, Luo, Zhang, Liu, Wang, Chen and Dong</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>
<p>Helminth derived excretory/secretory molecules have shown efficacy in the treatment of allergic asthma in mice, but their roles in allergic rhinitis (AR) are little known. In this study, we aimed to determine the intervention effect of SJMHE1, a <italic>Schistosoma japonicum</italic> derived small molecular peptide, on ovalbumin (OVA)-induced AR mice and investigate its possible mechanism. AR was induced in BALB/c mice, following which the mice were treated with phosphate-buffered saline (PBS), OVA<sup>323-339</sup> and SJMHE1 respectively. SJMHE1 treatment improved clinical symptoms (rubbing and sneezing), suppressed infiltrates of inflammatory cells and eosinophils in nasal mucosa, modulated the production of type-2 (IL-4 and IL-13) and anti-inflammatory (IL-10) cytokines in the nasal lavage fluids (NLF), spleen, and serum. To investigate the underlying mechanism, fluorescein isothiocyanate (FITC)-labeled SJMHE1 was subcutaneously injected into AR mice, and we found that the FITC-SJMHE1 could accumulate in spleen, but not in nasal mucosa. FITC-SJMHE1 mainly bound to CD19 positive cells (B cells), and the SJMHE1 treatment significantly increased the proportion of regulatory B cells (Bregs) and B10 cells, along with the enhancement of PR domain containing protein 1 (Prdm1) protein levels. SJMHE1 may alleviate AR by upregulating Bregs, and has great potential as a new avenue for the AR treatment.</p>
</abstract>
<kwd-group>
<kwd>
<italic>Schistosoma japonicum</italic> peptide SJMHE1</kwd>
<kwd>allergic rhinitis</kwd>
<kwd>spleen</kwd>
<kwd>CD19 cells</kwd>
<kwd>Bregs</kwd>
</kwd-group>
<contract-sponsor id="cn001">National Natural Science Foundation of China<named-content content-type="fundref-id">10.13039/501100001809</named-content>
</contract-sponsor>
<counts>
<fig-count count="8"/>
<table-count count="0"/>
<equation-count count="0"/>
<ref-count count="43"/>
<page-count count="11"/>
<word-count count="4593"/>
</counts>
<custom-meta-wrap>
<custom-meta>
<meta-name>section-in-acceptance</meta-name>
<meta-value>Parasite and Host</meta-value>
</custom-meta>
</custom-meta-wrap>
</article-meta>
</front>
<body>
<sec id="s1" sec-type="intro">
<title>Introduction</title>
<p>Allergic rhinitis (AR) is a common allergic inflammatory disease of the nasal airways, affecting 10%-40% of the global population, and having become a serious global public health concern (<xref ref-type="bibr" rid="B5">Brozek et&#xa0;al., 2017</xref>; <xref ref-type="bibr" rid="B3">Bousquet et&#xa0;al., 2020</xref>). Type-2 immune environment is the fundamental element of AR, which induces immunoglobulin E (IgE) produce and results in the appearance of symptoms such as rubbing and sneezing (<xref ref-type="bibr" rid="B20">Meng et&#xa0;al., 2019</xref>). Antihistamines, corticosteroids and antileukotrienes are effective for the symptom management of AR patients, however they cannot induce the disease regression, which prompts us to seek new therapeutic strategies.</p>
<p>Epidemiological studies exhibited an inverse geographic distribution of allergic inflammatory response and parasitic infections (<xref ref-type="bibr" rid="B22">Okada et&#xa0;al., 2010</xref>). Based on this, helminth therapy, especially helminth derived excretory/secretory molecules (helminth-E/S) (<xref ref-type="bibr" rid="B14">Harnett and Harnett, 2010</xref>), has rapidly been attempted as potential option to control dysregulated allergic responses. Indeed, some helminth-E/S, such as ES-62 (<xref ref-type="bibr" rid="B27">Rzepecka et&#xa0;al., 2014</xref>; <xref ref-type="bibr" rid="B6">Coltherd et&#xa0;al., 2016</xref>), HpARI (<xref ref-type="bibr" rid="B23">Osbourn et&#xa0;al., 2017</xref>), rSjP40 (<xref ref-type="bibr" rid="B25">Ren et&#xa0;al., 2016</xref>) and AIP-2 (<xref ref-type="bibr" rid="B21">Navarro et&#xa0;al., 2016</xref>), were reported to effectively prevent allergic airway inflammation in asthmatic mice, which confirmed that helminth-E/S are a new promising drugs for the treatment of allergic disease (<xref ref-type="bibr" rid="B7">Cruz et&#xa0;al., 2017</xref>; <xref ref-type="bibr" rid="B2">Bohnacker et&#xa0;al., 2020</xref>; <xref ref-type="bibr" rid="B19">Lothstein and Gause, 2021</xref>).</p>
<p>We have identified a peptide from the heat shock protein 60 (HSP60) of <italic>Schistosoma japonicum</italic> and named it SJMHE1 (<xref ref-type="bibr" rid="B40">Wang et&#xa0;al., 2009</xref>). In comparison with the above-mentioned helminth-E/S, SJMHE1 is a small molecule. SJMHE1 could suppress the inflammatory response in mice with ovalbumin (OVA)-induced delayed-type hypersensitivity (<xref ref-type="bibr" rid="B39">Wang et&#xa0;al., 2016</xref>), collagen-induced arthritis (<xref ref-type="bibr" rid="B36">Wang et&#xa0;al., 2017</xref>) and dextran sulfate sodium-induced colitis (<xref ref-type="bibr" rid="B29">Shan et&#xa0;al., 2021</xref>). Moreover, SJMHE1 ameliorated the airway inflammation of OVA-induced asthmatic mice and down regulated the expression of type 2-related cytokines (such as IL-4 and IL-13) (<xref ref-type="bibr" rid="B43">Zhang et&#xa0;al., 2019</xref>; <xref ref-type="bibr" rid="B17">Li et&#xa0;al., 2021</xref>). We hypothesized that SJMHE1 might be effective for the treatment of AR.</p>
<p>In this study, we explored the roles of SJMHE1 in AR mice and sought to determine its possible mechanisms.</p>
</sec>
<sec id="s2" sec-type="materials|methods">
<title>Materials and methods</title>
<sec id="s2_1">
<title>Peptides</title>
<p>Peptide SJMHE1 (VPGGGTALLRCIPVLDTLSTKNED) and its control OVA<sup>323-339</sup> were synthesized and purified from Top-peptide (Shanghai, China). Polymyxin B-agarose was used to remove possible Lipopolysaccharide (LPS) contamination.</p>
</sec>
<sec id="s2_2">
<title>Murine model of AR</title>
<p>Six week female BALB/c mice were purchased from the Comparative Medicine Centre of Yangzhou University (Yangzhou, China). Experimental AR was induced according to a previous report (<xref ref-type="bibr" rid="B31">Suzuki et&#xa0;al., 2020</xref>). Briefly, mice were sensitized with OVA (10 &#x3bc;g) and 2 mg of Al(OH)<sub>3</sub> in 200 &#x3bc;l PBS intraperitoneally on days 0, 7 and 14. Subsequently, the mice were challenged intranasally with OVA (100 &#xb5;g) on days 21&#x2013;27 and 29-35 (once a day).</p>
</sec>
<sec id="s2_3">
<title>Study design</title>
<p>Mice were randomly divided into four groups: Control, PBS, OVA<sup>323-339</sup> and SJMHE1. Control group was normal healthy mouse. In groups PBS, OVA<sup>323-339</sup> and SJMHE1, each mouse was sensitized with OVA (10 &#x3bc;g) and 2 mg of Al(OH)<sub>3</sub> in 200 &#x3bc;l PBS intraperitoneally on days 0, 7 and 14, then, these mice were challenged intranasally with OVA (100 &#xb5;g) on days 21&#x2013;27 and 29-35. On days 0, 14 and 28, mice in the PBS, OVA<sup>323-339</sup> and SJMHE1 groups were injected subcutaneously (inner thigh) with PBS (50 &#x3bc;L), OVA<sup>323-339</sup> (10 &#xb5;g; emulsified with incomplete Freund&#x2019;s adjuvant) and SJMHE1 (10 &#xb5;g; emulsified with incomplete Freund&#x2019;s adjuvant), respectively. Mice were sacrificed at day-36, and the samples (such as nasal mucosa and serum) were collection. Study design was displayed in <xref ref-type="fig" rid="f1">
<bold>Figure&#xa0;1</bold>
</xref>.</p>
<fig id="f1" position="float">
<label>Figure&#xa0;1</label>
<caption>
<p>Experimental protocol for the development of allergic rhinitis and treatment with SJMHE1. BALB/c mice were sensitized with OVA and aluminum hydroxide in PBS on days 0, 7 and 14 by intraperitoneal injection (i.p.). Subsequently, the sensitized mice were challenged intranasally with OVA daily from days 21 to 27 and 29 to 35. PBS, emulsified OVA<sup>323-339</sup> or SJMHE1 with incomplete Freund&#x2019;s adjuvant were subcutaneously (inner thigh) injected into mice on days 0, 14 and 28. The mice were sacrificed on day 36 and the samples were collected.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fcimb-13-1143950-g001.tif"/>
</fig>
</sec>
<sec id="s2_4">
<title>Nasal allergic symptoms</title>
<p>The number of nasal rubbing movements and sneezes was counted for 20 min immediately after the last OVA challenge on day 35.</p>
</sec>
<sec id="s2_5">
<title>Histopathological analysis</title>
<p>All mice were sacrificed on day 36. The specimens of mice from each group were removed and immersed in 4% buffered paraformaldehyde, embedded in paraffin wax and sectioned at a thickness of 4 &#x3bc;m. Then, the paraffin-embedded sections were stained with hematoxylin and eosin (HE). Nasal mucosal smears have been used for morphological analysis (<xref ref-type="bibr" rid="B24">Pipkorn and Karlsson, 1988</xref>). The nasal mucosa was evenly smeared onto glass slides for Wright-Giemsa staining (BASO, Zhuhai, China).</p>
</sec>
<sec id="s2_6">
<title>Nasal lavage fluids and serum cytokine detection</title>
<p>Levels of IL-4, IL-13 and IL-10 in the NLF and serum were measured using commercial enzyme-linked immune sorbent assay (ELISA) according to the manufacturer&#x2019;s instructions (MultiSciences, Hangzhou, China).</p>
</sec>
<sec id="s2_7">
<title>OVA-specific IgE measurement</title>
<p>The levels of OVA-specific IgE in mouse serum were carried out by ELISA in accordance with the method previously reported (<xref ref-type="bibr" rid="B43">Zhang et&#xa0;al., 2019</xref>; <xref ref-type="bibr" rid="B17">Li et&#xa0;al., 2021</xref>). The absorbance at 450 nm was detected with a microplate reader (Biotek Winooski, Vermont).</p>
</sec>
<sec id="s2_8">
<title>Immunofluorescence</title>
<p>FITC-labeled SJMHE1 (10 &#xb5;g; emulsified with incomplete Freund&#x2019;s adjuvant) was injected into mice (inner thigh) subcutaneously (PBS was used as blank control). On day 3, 7, and 14, the OVA mice were sacrificed, the nasal mucosa and spleen were collected for frozen section. Finally, the sections were observed under an inverted fluorescence microscope (Nikon, Japan).</p>
</sec>
<sec id="s2_9">
<title>Real-time PCR</title>
<p>Total RNA was extracted from the splenocytes of mice, and was reverse-transcribed into cDNA by using the Prime Script 1st Strand cDNA synthesis kit (Takara, Tokyo, Japan). Quantitative analysis of the relative mRNA expression was performed by using SYBR Premix Ex Taq (Takara) in a QuantStudio 5 Real-Time system (Termo Fisher Scientifc, Waltham, MA). All of the primers for real-time PCR were purchased from Tsingke Biotechnology (Nanjing, China). The average transcript levels of genes were normalized to &#x3b2;-actin. The relative mRNA expression was calculated using the formula 2<sup>&#x2212;&#x25b3;&#x25b3;Ct</sup> method, based on our previous description (<xref ref-type="bibr" rid="B8">Dong et&#xa0;al., 2014</xref>).</p>
</sec>
<sec id="s2_10">
<title>Flow cytometry analysis</title>
<p>The fluorescent mAbs CD4, CD19, CD11c, F4/80, CD1d, CD5 and IL-10 were purchased from Elabscience (Wuhan, China). Intracellular staining was conducted as described previously (<xref ref-type="bibr" rid="B42">Yang et&#xa0;al., 2012</xref>). Splenocytes from mice were suspended in the presence of PMA/ionomycin mixture (Phorbol 12-myristate 13-acetate, Multisciences) and monensin (Multisciences) for 5 hours to analyze B10 cells (CD1d<sup>hi</sup>CD5<sup>+</sup>B19<sup>+</sup>IL-10<sup>+</sup>). Then, the cells were collected and stained with PE Anti-CD19 mAbs, FITC anti-CD1d mAbs and PerCP/Cyanine5.5 anti-CD5 mAbs. After removing the unbound antibodies, the cells were fixed and permeabilized with Cytofix/Cytoperm (BD Biosciences, San Jose, CA). Then, they were stained with APC mouse anti-IL-10 following the manufacturer&#x2019;s instructions. The samples were performed using BD FACSCanto flow cytometer (BD Biosciences), and the results were analyzed using FlowJo Software (Version X; TreeStar, Ashland, OR).</p>
</sec>
<sec id="s2_11">
<title>Western blot analysis</title>
<p>The proteins of the splenocytes in mice were extracted for Western Blot analysis as described previously (<xref ref-type="bibr" rid="B9">Dong et&#xa0;al., 2021</xref>). Anti-PRDM1/Blimp1 (abcam; 1:1000 dilution) and GAPDH (Proteintech, Wuhan, China; 1:1000 dilution) were used as the primary antibodies. HRP-conjugated ant-mouse IgG (Affinity Biosciences, Changzhou, China) was also utilized. ECL chemiluminescence kit (Thermo Fisher Scientific) was used for chemiluminescent detection followed by image analysis.</p>
</sec>
<sec id="s2_12">
<title>RNA sequencing and analysis</title>
<p>1.5&#xd7;10<sup>6</sup> CD19<sup>+</sup> cells from splenocytes were isolated by fluorescence-activated cell sorting (FACS). Total RNA samples extracted from the splenic B cells were subjected to RNA sequencing and analysis. The three samples from each group were mixed together separately for testing. RNA-seq experiment was carried out by LC-BIO Bio Technology (Hangzhou, China). After sequencing, the data were analyzed on the free online platform of LC-Bio Cloud Platform (<ext-link ext-link-type="uri" xlink:href="https://www.omicstudio.cn/">https://www.omicstudio.cn/</ext-link>).</p>
</sec>
<sec id="s2_13">
<title>Safety assessment of SJMHE1</title>
<p>Mice were treated with SJMHE1 every 2 weeks for 36 days (days 0, 14 and 28). Healthy mice were used as controls. Mice survival and body weight were recorded once a week. At day 36, mice serum were collected and the serum biochemistry including alanine aminotransferase (ALT), aspartate aminotransferase (AST), creatinine (CREA) and urea nitrogen (UREA) were measured using Beckman Coulter AU2700 automatic biochemical analyzer (Beckman Coulter, Miami, FL). Major organs (heart, liver, spleen, lungs and kidneys) of mice were collected for HE staining to assess histological changes.</p>
</sec>
<sec id="s2_14">
<title>Statistical analyses</title>
<p>Statistical analyses were performed with GraphPad Prism 8.01 (GraphPad Software, San Diego, CA). The data are expressed as the mean &#xb1; standard deviation (SD). The groups were compared using the Student&#x2019;s <italic>t</italic> test, one way ANOVA with Tukey Kramer <italic>post hoc</italic> tests. <italic>P</italic>&lt;0.05 was considered statistically significant.</p>
</sec>
</sec>
<sec id="s3" sec-type="results">
<title>Results</title>
<sec id="s3_1">
<title>SJMHE1 treatment reduced the numbers of rubbing movements and nasal sneezes in AR mice</title>
<p>AR mouse model was induced by OVA. PBS, OVA<sup>323-339</sup> and SJMHE1 were subcutaneously injected into mice to examine the intervene effect (<xref ref-type="fig" rid="f1">
<bold>Figure&#xa0;1</bold>
</xref>). The number of rubbing movements and nasal sneezes were counted immediately after the last nasal challenge on day 35. Compared with control group (normal health mice), the OVA-challenged mice treated with PBS or OVA<sup>323-339</sup> presented significantly increased number of rubbing movements and nasal sneezes. Compared with PBS or OVA<sup>323-339</sup> group, SJMHE1 treatment dramatically reduced the nose-rubbing/sneezing events (<xref ref-type="fig" rid="f2">
<bold>Figures&#xa0;2A, B</bold>
</xref>), and inhibited OVA-induced skin denudation (<xref ref-type="fig" rid="f2">
<bold>Figure&#xa0;2C</bold>
</xref>).</p>
<fig id="f2" position="float">
<label>Figure&#xa0;2</label>
<caption>
<p>SJMHE1 treatment inhibits nasal rubbing and sneezes in allergic mice. The number of nasal rubbing <bold>(A)</bold> and sneezes movements <bold>(B)</bold> was counted for 20 min immediately after the last nasal challenge. Data are presented as mean &#xb1; SD (n = 11) from three independent experiments. Each dot represents data from one animal. <bold>(C)</bold> Representative image showing nasal external skin lesion induced by scratching. One-way analysis of variance (Tukey Kramer <italic>post hoc</italic> tests): **<italic>P</italic>&lt;0.01, ***<italic>P</italic>&lt;0.001.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fcimb-13-1143950-g002.tif"/>
</fig>
</sec>
<sec id="s3_2">
<title>SJMHE1 attenuated inflammatory cell infiltration in nasal mucosa</title>
<p>The symptoms of AR are concentrated in the nose. Thus, the pathological changes of nasal mucosa in each group were investigated by using HE. As shown in <xref ref-type="fig" rid="f3">
<bold>Figure&#xa0;3A</bold>
</xref>, compared with control group, the PBS and OVA<sup>323-339</sup> groups had a large amount of inflammatory cell infiltration. SJMHE1 treatment significantly reduced OVA-induced inflammatory cell infiltration. Next, the number of eosinophils in nasal mucosa was examined by using Wright-Giemsa staining. We found that SJMHE1 administration dramatically decreased eosinophils numbers, compared with PBS even or OVA<sup>323-339</sup> treatments (<xref ref-type="fig" rid="f3">
<bold>Figures&#xa0;3B, C</bold>
</xref>).</p>
<fig id="f3" position="float">
<label>Figure&#xa0;3</label>
<caption>
<p>SJMHE1 treatment inhibits the development of nasal mucosa inflammation in allergic mice. <bold>(A)</bold> Representative photographs of HE-stained nasal mucosa sections from each group. 20&#xd7; magnification. <bold>(B)</bold> Histological analysis of nasal mucosa from mice by Wright-Giemsa staining. 100&#xd7; magnification. Representative images are showed. <bold>(C)</bold> The number of eosinophils in nasal mucosa was measured microscopically. Data are presented as mean &#xb1; SD (n = 11) from three independent experiments. Each dot represents data from one animal. One-way analysis of variance (Tukey Kramer <italic>post hoc</italic> tests): ***<italic>P</italic>&lt;0.001.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fcimb-13-1143950-g003.tif"/>
</fig>
</sec>
<sec id="s3_3">
<title>SJMHE1 treatment modulated cytokine expression in the NLF of AR mice</title>
<p>AR is accompanied by the release of type-2 cytokines, such as IL-4 and IL-13 (<xref ref-type="bibr" rid="B10">Eifan and Durham, 2016</xref>). As shown in <xref ref-type="fig" rid="f4">
<bold>Figures&#xa0;4A, B</bold>
</xref>, increased levels of IL-4 and IL-13 in NLF form PBS and OVA<sup>323-339</sup> groups were observed. While, compared with PBS or OVA<sup>323-339</sup> groups, treatment with SJMHE1 was able to significantly reduce the concentrations of IL-4 and IL-13. Then, the expression of IL-10, a famous anti-inflammatory factor that inhibits type 2 immune responses (<xref ref-type="bibr" rid="B16">Kosaka et&#xa0;al., 2011</xref>), was detected. No significant difference in IL-10 contents was found among the Control, PBS and OVA<sup>323-339</sup> groups. SJMHE1 treatment upregulated the IL-10 levels compared with PBS and OVA<sup>323-339</sup> groups (<xref ref-type="fig" rid="f4">
<bold>Figure&#xa0;4C</bold>
</xref>). Overall, the above results indicated that SJMHE1 could amend AR symptoms and reduce inflammatory responses in AR mice.</p>
<fig id="f4" position="float">
<label>Figure&#xa0;4</label>
<caption>
<p>SJMHE1 treatment modulates the expression of cytokines in nasal lavage fluid (NLF) of allergic mice. On day 36, the mice were killed, and the NLF from each mouse was tested by ELISA. Statistical analysis of IL-4 <bold>(A)</bold>, IL-13 <bold>(B)</bold> and IL-10 <bold>(C)</bold> levels in the NLF. Data are presented as mean &#xb1; SD (n = 9-11) from three independent experiments. Each dot represents data from one animal. One-way analysis of variance (Tukey Kramer <italic>post hoc</italic> tests): *<italic>P</italic>&lt;0.05, **<italic>P</italic>&lt;0.01, ***<italic>P</italic>&lt;0.001.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fcimb-13-1143950-g004.tif"/>
</fig>
</sec>
<sec id="s3_4">
<title>SJMHE1 accumulated in spleen and regulate the systemic immune response in AR mice</title>
<p>To explore the mechanisms of SJMHE1-induced protection in AR, FITC-SJMHE (green) was injected into mice. First, the green signal in nasal mucosa was detected, as AR is a nasal airway inflammatory disease. While, no green fluorescence was observed at day 3, 7, and 14 post FITC-SJMHE1 injection. Given that SJMHE1 could regulate the spleen immune responses (<xref ref-type="bibr" rid="B43">Zhang et&#xa0;al., 2019</xref>; <xref ref-type="bibr" rid="B17">Li et&#xa0;al., 2021</xref>), we further scan the distribution of FITC-SJMHE1 in spleen. Indeed, green fluorescence was observed in mouse spleen at all inspection days (<xref ref-type="fig" rid="f5">
<bold>Figure&#xa0;5A</bold>
</xref>). Compared with the PBS group, the spleen mRNA levels of IL-4 and IL-13 in SJMHE1-treated mice were significantly down-regulated, and IL-10 expression was upregulated (<xref ref-type="fig" rid="f5">
<bold>Figures&#xa0;5B-D</bold>
</xref>). In addition, SJMHE1 treatment reduced the protein levels of IL-4 and IL-13 in serum, and increased the level of IL-10 (<xref ref-type="fig" rid="f5">
<bold>Figures&#xa0;5E-G</bold>
</xref>). Correspondingly, OVA-specific IgE levels in serum were significantly reduced after SJMHE1 treatment (<xref ref-type="fig" rid="f5">
<bold>Figure&#xa0;5H</bold>
</xref>).</p>
<fig id="f5" position="float">
<label>Figure&#xa0;5</label>
<caption>
<p>SJMHE1 accumulates in spleen and regulates the systemic immune response in AR mice. <bold>(A)</bold> Immunofluorescence of FITC-SJMHE1 (green) in nasal mucosa and spleen of mice at day 3, 7, and 14 after FITC-SJMHE1 treatment. Quantitative analysis for relative IL-4 <bold>(B)</bold>, IL-13 <bold>(C)</bold> and IL-10 <bold>(D)</bold> genes expression in the spleen of mice. Data are presented as mean &#xb1; SD (n = 11) from two independent experiments. Each dot represents data from one animal. <bold>(E&#x2013;G)</bold> Statistical analysis of IL-4, IL-13 and IL-10 levels in the serum, respectively. Data are presented as mean &#xb1; SD (n = 11) from three independent experiments. Each dot represents data from one animal. <bold>(H)</bold> OVA-specific IgE level in serum of mice. Data are presented as mean &#xb1; SD (n = 11) from three independent experiments. Each dot represents data from one animal. One-way analysis of variance (Tukey Kramer <italic>post hoc</italic> tests): *<italic>P</italic>&lt;0.05, **<italic>P</italic>&lt;0.01, ***<italic>P</italic>&lt;0.001.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fcimb-13-1143950-g005.tif"/>
</fig>
</sec>
<sec id="s3_5">
<title>SJMHE1 mainly bound to B cells and increased the proportion of Bregs</title>
<p>To identify the specific cell targeted by the SJMHE1, spleen cells were collected from AR mice post FITC-SJMHE1 injection 7 days and stained by using CD4 (T cells), CD19 (B cells), CD11c (DC cells), and F4/80 (macrophage). Intriguingly, flow cytometry showed that the percentage of CD19<sup>+</sup>FITC<sup>+</sup> cells in the spleens were the highest in relative comparison to the CD4<sup>+</sup>FITC<sup>+</sup>, CD11c<sup>+</sup>FITC<sup>+</sup>, and F4/80<sup>+</sup>FITC<sup>+</sup> (<xref ref-type="fig" rid="f6">
<bold>Figure&#xa0;6A</bold>
</xref>). Therefore, B cells were regarded as the focus of attention. Then, we analyzed the co-localization between FITC-SJMHE1 and B cells using fluorescence microscopy and found most FITC signal (green) co-localize with splenic CD19 cells (red), which further verified that SJMHE1could indeed directly bind with B cells (<xref ref-type="supplementary-material" rid="SF1">
<bold>Supplementary Figure&#xa0;1</bold>
</xref>). B cells were not expanded upon SJMHE1 treatment compared with PBS group in AR mice (<xref ref-type="fig" rid="f6">
<bold>Figure&#xa0;6B</bold>
</xref>). To better understand the biological processes of SJMHE1 on B cells, spleen B cells were isolated from PBS and SJMHE1 groups by flow sorting method (<xref ref-type="fig" rid="f6">
<bold>Figure&#xa0;6C</bold>
</xref>), and then, a global RNA sequencing was performed. Data were analyzed based on Fragments Per Kilobase per Million mapped reads (FPKM), and the comparison generated a heat map and volcano plot of differentially expressed genes (<xref ref-type="fig" rid="f6">
<bold>Figures&#xa0;6D, E</bold>
</xref>). In total, SJMHE1 treatment showed 162 upregulated mRNAs and 292 downregulated mRNAs (<xref ref-type="supplementary-material" rid="SF3">
<bold>Additional file 1</bold>
</xref>). Interestingly, the most upregulated gene in above modules were <italic>Hspa1a</italic> and <italic>Hspa1b</italic> (<xref ref-type="fig" rid="f6">
<bold>Figures&#xa0;6E, F</bold>
</xref>), which encode heat shock protein 70 (HSP70) (<xref ref-type="bibr" rid="B28">Schroder et&#xa0;al., 2003</xref>) that are primarily expressed on Bregs (<xref ref-type="bibr" rid="B34">Wang et&#xa0;al., 2021</xref>). Bregs are immunosuppressive cells and they can inhibit immune response by producing IL-10 (<xref ref-type="bibr" rid="B26">Rosser and Mauri, 2015</xref>). Thus, the AR protection induced by SJMHE1 might involve in the upregulation of Bregs. Indeed, compare with the PBS group, the proportion of Bregs was increased in SJMHE1-treated mice (<xref ref-type="fig" rid="f6">
<bold>Figures&#xa0;6G, H</bold>
</xref>). Particularly, B10 cells (CD1d<sup>hi</sup>CD5<sup>+</sup>B19<sup>+</sup>IL-10<sup>+</sup>), a major Bregs subpopulation producing IL-10 (<xref ref-type="bibr" rid="B41">Xie et&#xa0;al., 2021</xref>), were also significantly increased by SJMHE1 administration (<xref ref-type="fig" rid="f6">
<bold>Figures&#xa0;6I, J</bold>
</xref>).</p>
<fig id="f6" position="float">
<label>Figure&#xa0;6</label>
<caption>
<p>SJMHE1 binds to B cells in the spleen and upregulates the ratio of Bregs and B10 cells. <bold>(A)</bold> The percentages of CD4<sup>+</sup>FITC<sup>+</sup> cells, CD19<sup>+</sup>FITC<sup>+</sup> cells, CD11c<sup>+</sup>FITC<sup>+</sup> cells and F4/80<sup>+</sup>FITC<sup>+</sup> cells in spleen were analyzed by flow cytometry, and <bold>(B)</bold> percentage of CD19<sup>+</sup> cells is shown (n = 3-5). <bold>(C)</bold> Splenocytes from mice were enriched for CD19<sup>+</sup> cells using a flow cytometry sorter. <bold>(D)</bold> Gene expression profiles of the PBS and SJMHE1 groups were clustered in an unsupervised hierarchical manner. The heat map of differentially expressed genes identified by clustering analysis is shown in the figure. Each column represents a sample and each row represents a gene. Red and blue colors indicate genes with up- and down-regulated expression, respectively. <bold>(E)</bold> Dot plot shows 454 significantly differentially expressed (<italic>P</italic> &lt; 0.05 and |log<sub>2</sub>FC| &gt; 1) genes with 292 downregulated and 162 upregulated in the SJMHE1 group. FC: fold change. <bold>(F)</bold> Real-time PCR analysis of <italic>Hspa1a</italic> and <italic>Hspa1b</italic> mRNA levels in CD19<sup>+</sup> B cells isolated from mouse splenocytes (n = 3). <bold>(G, H)</bold> Percentages of CD19<sup>+</sup>IL-10<sup>+</sup> cells. Data are presented as mean &#xb1; SD (n = 9-11) from three independent experiments. Each dot represents data from one animal. <bold>(I, J)</bold> IL-10<sup>+</sup> B-cell frequencies gated on CD1d<sup>hi</sup>CD5<sup>+</sup> (n = 3-5). <bold>(K)</bold> Prmd1 expression in spleen of mice was detected by Western blotting (n = 2-3). One-way analysis of variance (Tukey Kramer <italic>post hoc</italic> tests) and Student&#x2019;s <italic>t</italic> test: **<italic>P</italic>&lt;0.01, ***<italic>P</italic>&lt;0.001.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fcimb-13-1143950-g006.tif"/>
</fig>
<p>PR domain containing protein 1 (Prdm1) is considered as the key transcription factor for mediating Bregs differentiation (<xref ref-type="bibr" rid="B38">Wang et&#xa0;al., 2019b</xref>). Then, we detected its expression in spleen by Western blot analysis. As shown in <xref ref-type="fig" rid="f6">
<bold>Figure&#xa0;6K</bold>
</xref>, compared with PBS group, the protein levels of Prdm1 were enhanced in AR mice post-SJMHE1 administration.</p>
<p>In addition, we performed an <italic>in vitro</italic> experiment where splenic B cells are exposed to the SJMHE1. Compared with control, SJMHE1 could significantly induce the numbers of IL-10 producing B cells (<xref ref-type="fig" rid="f7">
<bold>Figures&#xa0;7A, B</bold>
</xref>). In addition, a significantly higher levels of IL-10 were found in the supernatant of the B cell treated by SJMHE1 (<xref ref-type="fig" rid="f7">
<bold>Figure&#xa0;7C</bold>
</xref>).</p>
<fig id="f7" position="float">
<label>Figure&#xa0;7</label>
<caption>
<p>Breg cells can be generated <italic>in vitro</italic> by direct interaction with SJMHE1. <bold>(A, B)</bold> Splenic B cells from na&#xef;ve mice were cultured for 24 h with SJMHE1 (0.5 &#x3bc;g/ml), OVA<sup>323-339</sup> (0.5 &#x3bc;g/ml), or medium. Intracellular IL-10 expression of total B cells after addition of PMA/ionomycin and monenisn to the last 4 hours of the culture was determined by flow cytometry. Data are presented as mean &#xb1; SD (n = 9) from three independent experiments. <bold>(C)</bold> Splenic B cells from na&#xef;ve mice were cultured with SJMHE1 (0.5 &#x3bc;g/ml) for 24 hours, and the protein levels of IL-10 in the supernatant were detected by ELISA. Data are presented as mean &#xb1; SD (n = 6) from two independent experiments. One-way analysis of variance (Tukey Kramer <italic>post hoc</italic> tests): ***<italic>P</italic>&lt;0.001.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fcimb-13-1143950-g007.tif"/>
</fig>
</sec>
<sec id="s3_6">
<title>OVA-induced AR mice treated with SJMHE1 display changes in the pathway in the B cells</title>
<p>RNA-seq analysis on the spleen B cell were also performed comparing control group versus the SJMHE1 group, and control group versus PBS group. As shown in <xref ref-type="supplementary-material" rid="SF2">
<bold>Supplementary Figure&#xa0;2</bold>
</xref>; <xref ref-type="supplementary-material" rid="SF4">
<bold>Additional files 2</bold>
</xref>, <xref ref-type="supplementary-material" rid="SF5">
<bold>3</bold>
</xref>, compared with control group, 1588 upregulated mRNAs and 1849 downregulated mRNAs was observed in SJMHE1 group, and 1662 upregulated mRNAs and 1804 downregulated mRNAs in PBS group. Kyoto Encyclopedia of Genes and Genomes (KEGG) was used to identify the biological pathways that were enriched most significantly in the above groups, and the top 20 most significantly enriched pathways included those related to lyfomome, ferroptosis, asthma, intestinal immune network for IgA production, and so on.</p>
<p>In addition, KEGG pathway analysis revealed that the genes that were most significantly differentially expressed between SJMHE1 and PBS groups were those associated with cytokine-cytokine receptor interactions, T cell receptor signaling pathway, JAK-STAT signaling pathway, MAPK signaling pathway, suggesting that SJMHE1 might drive the differentiation of B cells into Bregs through multiple targets.</p>
</sec>
<sec id="s3_7">
<title>Toxicity of SJMHE1</title>
<p>The safety of SJMHE1 treatment was evaluated during all <italic>in vivo</italic> studies (<xref ref-type="fig" rid="f8">
<bold>Figure&#xa0;8A</bold>
</xref>). No animal died in 36 days (date not shown). Compared with the health mice (Control group), no obvious tissue damages and inflammatory infiltration happened after SJMHE1 treatment in the HE staining of heart, liver, spleen, lung, and kidney (<xref ref-type="fig" rid="f8">
<bold>Figure&#xa0;8B</bold>
</xref>). SJMHE1 had no impact on mouse body weight (<xref ref-type="fig" rid="f8">
<bold>Figure&#xa0;8C</bold>
</xref>). ALT, AST, UREA, and CREA (the liver and kidney function-related blood biochemical values) in the serum of mice on day 36 were detected, and compared with the control, no significant differences have been found in the mice after SJMHE1 administration (<xref ref-type="fig" rid="f8">
<bold>Figures&#xa0;8D, E</bold>
</xref>).</p>
<fig id="f8" position="float">
<label>Figure&#xa0;8</label>
<caption>
<p>Biocompatibility evaluation of SJMHE1. <bold>(A)</bold> Schematic diagram for SJMHE1 treatment. <bold>(B)</bold> HE staining. <bold>(C)</bold> Body weight of mice. <bold>(D, E)</bold> The indicators reflecting the physiological functions of the liver (ALT and AST) and kidneys (CREA and UREA) were tested. Each dot represents data from one animal, and data are presented as mean &#xb1; SD (n = 10) from three independent experiments. Student&#x2019; s <italic>t</italic> test.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fcimb-13-1143950-g008.tif"/>
</fig>
</sec>
</sec>
<sec id="s4" sec-type="discussion">
<title>Discussion</title>
<p>AR is a widespread allergic disease and the ideal treatment strategies are still lacking. Recently, helminth-E/S are thought to be new promising therapeutics option for immunological disorders (<xref ref-type="bibr" rid="B7">Cruz et&#xa0;al., 2017</xref>; <xref ref-type="bibr" rid="B2">Bohnacker et&#xa0;al., 2020</xref>; <xref ref-type="bibr" rid="B19">Lothstein and Gause, 2021</xref>). Based on the previous findings that SJMHE1 was effective against airway inflammation in allergic asthma mice (<xref ref-type="bibr" rid="B43">Zhang et&#xa0;al., 2019</xref>; <xref ref-type="bibr" rid="B17">Li et&#xa0;al., 2021</xref>), we further explored the intervention effect of SJMHE1 on OVA-induced AR. To the best of our knowledge, this is the first report about the roles of helminth-E/S in AR.</p>
<p>OVA intraperitoneal injection followed by repeated upper-airway OVA challenge (intranasal) was used to induce allergic inflammation of the nasal mucosa, which is the well-established protocols of AR model (<xref ref-type="bibr" rid="B31">Suzuki et&#xa0;al., 2020</xref>; <xref ref-type="bibr" rid="B12">Fang et&#xa0;al., 2021</xref>). The nasal symptoms (eg, rubbing and sneezing) and antigen-specific IgE in serum play important roles in AR diagnosis (<xref ref-type="bibr" rid="B13">Greiner et&#xa0;al., 2011</xref>). Compared with PBS and OVA<sup>323-339</sup>, SJMHE1 effectively attenuated the allergic nasal symptoms, rubbing-caused nasal skin denudation, and OVA-specific IgE in OVA-induced AR mice, which was sufficient to demonstrate that SJMHE1 had an intervention effect on AR. In addition, compared with PBS, OVA<sup>323-339</sup> did not exhibit intervention effect, partly suggesting that the SJMHE1&#x2019; effectiveness had certain specificity.</p>
<p>The nasal mucosa inflammation of AR is characterized by the eosinophils recruited to the nasal mucosa and the increased level of type-2 cytokines (eg, IL-4 and IL-13) (<xref ref-type="bibr" rid="B20">Meng et&#xa0;al., 2019</xref>). Our results showed that SJMHE1 was effective in alleviating nasal mucosa eosinophil infiltrations, accompanied by reduced protein levels of IL-4 and IL-13 in NALF. These findings were similar to previous reports that SJMHE1 possessed strong ability to inhibit local (lung) type-2 immune response in asthma animals (<xref ref-type="bibr" rid="B43">Zhang et&#xa0;al., 2019</xref>; <xref ref-type="bibr" rid="B17">Li et&#xa0;al., 2021</xref>). Furthermore, in this study, we first investigated the distribution of SJMHE1 in local (nasal mucosa) or peripheral (spleen) immune organ in AR mice, and found that SJMHE1 could accumulate in spleen, but not in the nasal mucosa. Added to the fact that compared with PBS and OVA<sup>323-339</sup>, SJMHE1 treatment significantly reduced the expression of IL-4 and IL-13 in AR mouse spleen and serum, and decreased the levels of OVA-specific IgE in serum, we considered that the intervention roles of the SJMHE1 in AR were mediated through the systemic immune response, indicating that SJMHE1 might also have intervention effect on other type-2 diseases.</p>
<p>The percentage of Bregs significantly decreased in the peripheral blood of AR patients (<xref ref-type="bibr" rid="B15">Kim et&#xa0;al., 2016</xref>; <xref ref-type="bibr" rid="B37">Wang and Tan, 2020</xref>) and in OVA-challenged AR mouse (<xref ref-type="bibr" rid="B35">Wang et&#xa0;al., 2019a</xref>). The subset of Bregs in peripheral blood was described to suppress the Th2 response through the secretion of IL-10 (<xref ref-type="bibr" rid="B4">Braza et&#xa0;al., 2014</xref>; <xref ref-type="bibr" rid="B30">Stanic et&#xa0;al., 2015</xref>). Bregs regulate the immune tolerance in AR and Bregs-based immunotherapy is in the making (<xref ref-type="bibr" rid="B11">Fan et&#xa0;al., 2022</xref>). Interestingly, Breg cells are considered relevant in helminth infection disease (<xref ref-type="bibr" rid="B33">van der Vlugt et&#xa0;al., 2014</xref>; <xref ref-type="bibr" rid="B18">Li et&#xa0;al., 2022</xref>), and during Schistosoma infection, active Breg cells were enriched in the spleen and suppressed allergic responses <italic>via</italic> elevated IL-10 production (<xref ref-type="bibr" rid="B1">Amu et&#xa0;al., 2010</xref>; <xref ref-type="bibr" rid="B32">van der Vlugt et&#xa0;al., 2012</xref>). Thus, whether SJMHE1 has a regulatory effect on Breg is worth exploring. In this study, we found that SJMHE1 (1) mostly bound to spleen B cells; (2) increased the proportion of Bregs and its major subpopulation B10 in AR mouse, together with the upregulation of <italic>Hspa1a</italic> and <italic>Hspa1b</italic> (encode HSP70 that are primarily expressed on Bregs); (3) enhanced the levels of IL-10; (4) upregulated the protein levels of Prdm1 in spleen; (5) could significantly induce the numbers of IL-10 producing B cells <italic>in vitro</italic>. Taken together, these data strongly confirmed that SJMHE1 had the ability to up-regulate the proportion of Bregs, which might partly explain its protective effect in AR. Although, we do not know how SJMHE1 regulate Bregs, it is still an interesting attempt to regard SJMHE1 as the agonist of Bregs and to treat other inflammatory disease.</p>
<p>In recent years, the therapeutic potential of SJMHE1 in several animal models has been verified (<xref ref-type="bibr" rid="B19">Lothstein and Gause, 2021</xref>), while, it is necessary to explore its toxicology. Compared with health mice, no significant changes in survival, body weight, pathological changes (including heart, liver, spleen, lungs and kidneys) and serum indices were found post SJMHE1 treatment, partially confirming the safety of SJMHE1 administration.</p>
<p>This study does have a number of limitations: (1) Different doses of SJMHE1 and different time points of SJMHE1 administration should be investigated, which are used to determine the optimal concentration and time of SJMHE1 for AR treatment. (2) Although the FITC-labeled SJMHE1 could be taken up by B cells, this effector mechanism is not clear.</p>
<p>In conclusions, SJMHE1 effectively reduced allergic symptoms and inflammatory parameters in the AR mouse, providing a potential therapeutic modality in AR.</p>
</sec>
<sec id="s5" sec-type="data-availability">
<title>Data availability statement</title>
<p>The datasets presented in this study can be found in online repositories. The name of the repository and accession number(s) can be found below: NCBI Gene Expression Omnibus; accession number GSE229347.</p>
</sec>
<sec id="s6" sec-type="ethics-statement">
<title>Ethics statement</title>
<p>The animal study was reviewed and approved by Institutional Animal Care and Use Committee of Jiangsu University.</p>
</sec>
<sec id="s7" sec-type="author-contributions">
<title>Author contributions</title>
<p>XG, CM, LD conceived and designed the experiments. XG, CM, TZ, XX, LD analyzed the data. XG, CM, TZ, XX, XL, SZ, JL, XW, XC, LD performed the experiments. The manuscript was written by XG, CM, LD. All authors read and approved the final manuscript.</p>
</sec>
</body>
<back>
<sec id="s8" sec-type="funding-information">
<title>Funding</title>
<p>This work was supported by the grants from the National Natural Science Foundation of China (81370889 and 81900562). The key research and development plan of Zhenjiang city (SH2022046).</p>
</sec>
<sec id="s9" 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="s10" 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="s11" 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/fcimb.2023.1143950/full#supplementary-material">https://www.frontiersin.org/articles/10.3389/fcimb.2023.1143950/full#supplementary-material</ext-link>
</p>
<supplementary-material xlink:href="Image_1.tif" id="SF1" mimetype="image/tiff">
<label>Supplementary Figure&#xa0;1</label>
<caption>
<p>SJMHE1 bind to B cells. Immunofluorescence of FITC-SJMHE1 (green) in spleen of mice at day 3 after FITC-SJMHE1 treatment. Fluorescence microscopic image shows localization of FITC-SJMHE1 to CD19 B cells (indicated by the arrows). 10&#xd7; magnification.</p>
</caption>
</supplementary-material>
<supplementary-material xlink:href="Image_2.tif" id="SF2" mimetype="image/tiff">
<label>Supplementary Figure&#xa0;2</label>
<caption>
<p>OVA-induced AR mice treated with SJMHE1 display changes in the pathway in the B cells. <bold>(A)</bold> Volcano diagrams of mRNAs comparative gene expression analysis, and <bold>(B)</bold> differentially expressed genes were analyzed by KEGG enrichment analysis.</p>
</caption>
</supplementary-material>
<supplementary-material xlink:href="Table_1.xlsx" id="SF3" mimetype="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet">
<label>Additional file 1</label>
<caption>
<p>RNA sequencing of spleen B cells. The SJMHE1 group had 454 differentially expressed genes compared to the PBS group.</p>
</caption>
</supplementary-material>
<supplementary-material xlink:href="Table_2.xlsx" id="SF4" mimetype="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet">
<label>Additional file 2</label>
<caption>
<p>RNA sequencing of spleen B cells. The SJMHE1 group had 3437 differentially expressed genes compared to the Control group.</p>
</caption>
</supplementary-material>
<supplementary-material xlink:href="Table_3.xlsx" id="SF5" mimetype="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet">
<label>Additional file 3</label>
<caption>
<p>RNA sequencing of spleen B cells. The PBS group had 3466 differentially expressed genes compared to the Control group.</p>
</caption>
</supplementary-material>
</sec>
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