Background The prevalence of type 2 diabetes mellitus (T2DM) increases with age, and cellular senescence of pancreatic β-cells plays a key role in T2DM pathogenesis. As canagliflozin and acarbose have been shown to increase lifespan in mice, we investigated the effect of sodium-glucose cotransporter 2 (SGLT2) inhibitor, α-glucosidase inhibitor or both on the cellular senescence of β-cells in a T2DM mouse model.
Methods Enavogliflozin (0.3 mg/kg), acarbose (10 mg/kg), or vehicle was orally administered daily to db/db mice for 6 weeks. The levels of senescence markers (p16, p21, and p53) in the pancreas and kidney were measured through real-time polymerase chain reaction (PCR), immunofluorescence staining, and Western blot. In an in vitro analysis, isolated pancreatic islets were exposed to H2O2 to induce cellular senescence, then treated with β-hydroxybutyrate (β-HB), and subsequently assessed for levels of senescent markers.
Results Enavogliflozin alone or combined with acarbose effectively lowered blood glucose levels in db/db mice. The combined treatment resulted in the greatest increase in β-cell function calculated using insulinogenic index and homeostasis model assessment of β-cell function compared to the vehicle. Additionally, the combined treatment significantly reversed the increase in p16, with a similar trend observed in p21 and p53 in the islets. Treatment increased circulating β-HB and in vitro analysis suggested the activation of nuclear factor erythroid 2-related factor 2 (Nrf2) by β-HB in reducing senescence in the islets.
Conclusion The combined administration of enavogliflozin and acarbose significantly reduced blood glucose, improved β-cell function, and reduced senescent β-cells in db/db mice. This combination therapy holds potential as a senotherapeutic strategy for managing T2DM.
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Mitochondria are complex metabolic organelles with manifold pathophysiological implications in diabetes. Currently published mitochondrial-encoded peptides, which are expressed from the mitochondrial open reading frame of the 12S ribosomal RNA type-c (MOTS-c), 16S rRNA (humanin and short humanin like peptide 1-6 [SHLP1-6]), or small human mitochondrial open reading frame over serine tRNA (SHMOOSE) are associated with regulation of cellular metabolism and insulin action in age-related diseases, such as type 2 diabetes mellitus. This review focuses mainly on recent advances in MOTS-c research with regards to diabetes, including both type 1 and type 2. The emerging understanding of MOTS-c in diabetes may provide insight into the development of new therapies for diabetes and other age or senescence-related diseases.
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