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Decreased IGF1R Attenuates Senescence and Improves Function in Pancreatic beta-Cells

ABSTRACT: We previously reported that increased expression of IGF1R in mouse and human beta-cells is a marker of older beta-cells; however, its contribution to age-related dysfunction and cellular senescence remains to be determined. In this study, we explored the direct role of IGF1R in beta-cell function and senescence using inducible beta-cell specific IGF1R knockdown (betaIgf1rKD) mice. Adult betaIgf1rKD mice showed improved glucose clearance and glucose-induced insulin secretion, accompanied by decreased p21Cip1 protein expression in beta-cells. RNASeq of islets isolated from these betaIgf1rKD mice revealed restoration of 3 signaling pathways known to be downregulated by aging: sulfide oxidation, autophagy, and mTOR signaling. Additionally, deletion of IGF1R in mouse beta-cells increased transcription of genes important for maintaining beta-cell identity and function, such as Mafa, Nkx6.1, and Kcnj11, while decreasing senescence-related genes, such as Cdkn2a, Il1b, and Serpine 1. These results suggest that IGF1R signaling plays a causal role in aging-induced beta-cell dysfunction.

ORGANISM(S): Mus musculus

PROVIDER: GSE229709 | GEO | 2023/06/19

REPOSITORIES: GEO

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Project description:Purpose:Renal injury with the loss of podocyte was characteristic pathology of diabetic nephropathy (DN) and correlated with increased albuminuria. Many studies have found the nephroprotective effect of the novel inhibitors of sodium-glucose cotransporter 2 (SGLT2-is), like Dapagliflozin, delaying the progression of DN. However, the underlying mechanisms of SGLT2 associated with podocyte injury are still not fully elucidated. Methods: Through mRNA sequencing, streptozotocin-induced and Dapagliflozin-intraperitoneal injection mice models were established to explore potential mechanism between Dapagliflozin and renal phenotype. And all changes referring this observed pathway were proven repeatedly in podocyte. Results: Here, we generated the streptozotocin-induced DN models and found the accumulation of nephrotoxin and pathological lesions of the kidney, including interstitial inflammatory infiltration, mesangial expansion and glomerular sclerosis, while low expression of SGLT2 mitigated these injuries in Dapagliflozin-treated mice. Moreover, mRNA expression profile in these treated models determined the significance of insulin-like growth factor-1 receptor (IGF1R)/PI3K regulatory axis in glomerular injury. Particularly, SGLT2-is inhibited the increase of mesenchymal marker, α-SMA and the decrease of podocyte marker, nephrin at the gene or protein level. KEGG analysis also showed the enrichment of phosphatidylinositol signaling system and TGF-β/smad pathway. In parallel, the protein level of IGF1R, phosphorylated PI3K, and α-SMA were increased in high-glucose stimulated human podocyte, and reduced in Dapagliflozin (50nM and 100nM) or OSI-906 (inhibitor of IGF1R, 60nM) used groups. Notably, combination of the two inhibitors produced an accumulative effect in the protection of podocyte integrity. Mechanistically, IGF1 or IGF2 could bind to IGF1 receptors to mediate the epithelial-mesenchymal transition (EMT) of diabetic podocyte in response to the upregulation of SGLT2. Indeed, we enrolled the urine and plasma samples from a cohort consisting of 13 healthy people, and a cohort of 19 patients with DN using SGLT2-inhibitors (n=9) or not (n=10). Compared with pure DN patients, Elisa results suggested an increased circulation and excretion level of IGF1/2 in SGLT2-is used DN cohort. Conclusions: Taken together, our study reported the key role of SGLT2/IGF1R/PI3K signaling in regulating podocyte EMT. Modulating the IGF1R expression may provide a novel idea for DN therapy.

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Decreased IGF1R Attenuates Senescence and Improves Function in Pancreatic beta-Cells

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