Abstract
Emerging evidence has shown that microRNAs (miRNAs) play critical role in the pathogenesis of several disorders. In the present minireview, we focus our attention on the functional role of a specific miRNA, namely miR-34a, in the pathophysiology of frailty and diabetes mellitus. Based on the current literature, we speculate that this miRNA may serve as a potential biomarker of frailty in diabetic older adults. Additionally, its actions on oxidative stress might represent a druggable target to obtain new potentials treatments.
Background
Frailty is a clinical burden which is typical of older adults (Clegg et al., 2013; Hanlon et al., 2018). Frail older adults have a high risk of adverse events such as functional and cognitive impairment, hospitalizations, and death (Puts et al., 2017; Gilbert et al., 2018; Hoogendijk et al., 2019; Pilotto et al., 2020). A prompt diagnosis and a careful management of comorbidities is the first step to avoid adverse outcomes; diabetes is one of these comorbidities and it is very common in frail older adults (Umegaki, 2016; Yarnall et al., 2017; Clegg and Hassan-Smith, 2018; Nagai et al., 2018; Li et al., 2019; Sieber, 2019; Mone et al., 2022a; Mone et al., 2022b; Mone et al., 2022d). Indeed, diabetes leads to a higher risk of cardiovascular complications and functional and physical impairment driving adverse outcomes (Fadini and Avogaro, 2010; Prattichizzo et al., 2018; Yun et al., 2018; Jarvie et al., 2019; Yu et al., 2019; Gulsin et al., 2020).
microRNAs (miRNAs) are small non-coding RNAs that act as post-transcriptional gene regulators (Ambros, 2004; Krol et al., 2010; Santulli, 2015; Ferrante and Conti, 2017; Fridrichova and Zmetakova, 2019; Stavast and Erkeland, 2019; Mone et al., 2021b; Mone et al., Forthcoming 2022c); miRNAs exert their activity in many biological processes and have been proposed as biomarkers and therapeutic strategies (Creemers et al., 2012; Wronska et al., 2015; Barwari et al., 2016; Chen et al., 2018; Wong et al., 2018; Mone et al., 2021b; Fonseca et al., 2021; Mone et al., Forthcoming 2022c). Many miRNAs have been associated to mitochondrial dysfunction, inflammation, and oxidative stress and their concentration may vary in physiological conditions (Zhang et al., 2014; Hathaway et al., 2018; Wei et al., 2018; Rusanova et al., 2019; Song et al., 2019; Gambardella et al., Forthcoming 2022). Interestingly, several investigators evidenced the potential roles of microRNAs (miRNAs) in the pathogenesis of frailty (Rusanova et al., 2019; Carini et al., 2021; Lee et al., 2021; Carini et al., 2022; Dowling et al., 2022).
Specifically, miR-34a has been associated to frailty, aging, and diabetes (Figure 1) (Boon et al., 2013; Chakraborty et al., 2014; Rippo et al., 2014; Badi et al., 2018; Thounaojam and Bartoli, 2019; Kukreti and Amuthavalli, 2020; Ni et al., 2020; Manakanatas et al., 2022) and is generally considered a bona fide biomarker of cellular and vascular senescence (Badi et al., 2015; Park et al., 2020; Manakanatas et al., 2022).
Role of miR-34a in frailty and aging
The pathophysiology of frailty includes chronic inflammation, which is prevailing in aging (“inflammaging”), oxidative stress with or without mitochondrial dysfunction, insulin resistance, loss of anabolic hormones, and reduced tolerance to physical exercise with a reduction in muscle strength (Bandeen-Roche et al., 2015; Cruz-Jentoft and Sayer, 2019; Rusanova et al., 2019).
Frailty onset is due to the failure of multiple organs and/or systems and many pathologic conditions have been associated with frailty (Walston et al., 2008; Afilalo et al., 2014; Mone and Pansini, 2020; Mone et al., 2021a; Waite et al., 2021; Mone et al., 2022e). In 2001, Fried et al. (2001) developed the five criteria now routinely used to diagnose frailty. Equally important, the frailty index is another tool to diagnose and manage frailty (Rockwood et al., 2005; Searle et al., 2008).
In 2011, Khanna et al. (2011) observed an age-dependent decreased expression of miR-34a in the brain of calorie-restricted mice, mirrored by an increase in Bcl-2 expression, and a reduced expression of pro-apoptosis genes such as Bax. The authors concluded that this miRNA was involved in the neuronal survival in long-lived calorie-restricted fed mice.
A subsequent investigation by Zheng and collaborators evidenced the involvement of miR-34a in cellular senescence via MAPK: the authors detected its overexpression in sarcopenia, suggesting a role of this miRNA in the aging process of the skeletal muscle (Zheng et al., 2018). Similarly, miR-34a expression was significantly up-regulated in the hearts of aged mice lacking Calstabin 2, the stabilizing protein of the cardiac isoform of Ryanodine Receptor (Yuan et al., 2014). Another investigation revealed that an increased expression of miR-34a in older rats correlates with a concomitant decrease in the brain of the anti-aging target protein SIRT1 (Hu et al., 2017).
Notably, a clinical paper indicated miR-34a as a biomarker of aging/frailty in oncogeriatric populations (Dalmasso et al., 2018). In line with these observations, a very recent paper evidenced that miR-34 regulates protein translation and protein turnover in the aging brain of Drosophila (Srinivasan et al., 2022).
Role of miR-34a in diabetes
Insulin resistance is one of the most important features of Type 2 Diabetes mellitus (T2DM) (Feve and Bastard, 2009; Taylor, 2013; Mastrototaro and Roden, 2021). Of note, miR-34a supports pancreatic development and has been associated to insulin resistance and to the onset of T2DM (Wei et al., 2013; Chakraborty et al., 2014). Intriguingly, previous investigations had highlighted that the expression of miR-34a is increased in islets of diabetic mice (Rottiers and Naar, 2012). The prolonged exposure of saturated fatty acids to MIN6 β-cells and pancreatic islets increased the expression of miR-34a (Lovis et al., 2008). Furthermore, miR-34a leads to endothelial dysfunction and vascular senescence in diabetes (Li et al., 2016; Carracedo et al., 2019; Thounaojam and Bartoli, 2019), increasing the overall risk of oxidative stress and inflammation with or without diabetes (Li et al., 2016; Cheleschi et al., 2019; Xiong et al., 2019; Zimta et al., 2019; Li et al., 2021; Mahjabeen et al., 2021; Zhu et al., 2021).
Conclusion
Herein, we summarized the investigations linking miR-34a and frailty. Furthermore, miR-34 may be linked to diabetes and endothelial dysfunction. Based on the provided evidence, we speculate that this miRNA may serve as a potential biomarker of frailty in diabetic older adults. Additionally, its actions on oxidative stress might represents a druggable target in order to develop new potentials therapeutic options.
FIGURE 1
Functional role of miR-34 in frailty, aging, and diabetes.
Statements
Author contributions
Study concept and design: PM and GS. Drafting of the manuscript: PM, AP, and GS. Critical revision of the manuscript for important intellectual content: SJ, FV, UK, and GS. Administrative, technical, or material support: PM, AdD, and AP. Study supervision: PM and GS.
Conflict of interest
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.
Publisher’s note
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.
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Summary
Keywords
miRNA, miR-34, frailty, diabetes, aging
Citation
Mone P, de Donato A, Varzideh F, Kansakar U, Jankauskas SS, Pansini A and Santulli G (2022) Functional role of miR-34a in diabetes and frailty. Front. Aging 3:949924. doi: 10.3389/fragi.2022.949924
Received
21 May 2022
Accepted
29 June 2022
Published
18 July 2022
Volume
3 - 2022
Edited by
Manish Kumar Gupta, University of Central Florida, United States
Reviewed by
Angelica Perna, University of Molise, Italy
Alfonso Baldi, University of Campania Luigi Vanvitelli, Italy
Updates
Copyright
© 2022 Mone, de Donato, Varzideh, Kansakar, Jankauskas, Pansini and Santulli.
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.
*Correspondence: Pasquale Mone, pasquale.mone@einsteinmed.edu;, pasqualemone@hotmail.it
This article was submitted to Aging, Metabolism and Redox Biology, a section of the journal Frontiers in Aging
Disclaimer
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