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Genetic recording of pancreatic beta cell proliferation

ABSTRACT: Pancreatic beta cell generation and proliferation primarily rely on the self renewal of preexisting beta cells, making precise quantification of beta cell proliferation essential for understanding pancreatic homeostasis and pathogenesis. However, previous methods had limitations and were unable to trace beta cell proliferation in vivo over extended periods. Here, we developed beta cell ProTracer, a genetic system that uses dual recombinase technology to enable continuous and cell type–specific recording of beta cell proliferation in mice. The beta cell ProTracer system allows for the quantification of the proliferation rate of adult pancreatic beta cells during homeostasis and in response to injury or drug treatment. Clonal analysis of the proliferated beta cell population reveals a uniform proliferative capacity among these cells. Our findings enhance the understanding of beta cell proliferation dynamics in homeostasis, repair, and regeneration.

ORGANISM(S): Mus musculus

PROVIDER: GSE313841 | GEO | 2026/01/22

REPOSITORIES: GEO

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Project description:The NF-κB pathway is a master regulator of inflammatory processes and is implicated in insulin resistance and pancreatic beta cell dysfunction in the metabolic syndrome. While canonical NF-κB signaling is well studied, there is little information on the divergent non-canonical NF-κB pathway in the context of pancreatic islet dysfunction in diabetes. Here, we demonstrate that pharmacological activation of the non-canonical NF-κB inducing kinase (NIK) disrupts glucose homeostasis in zebrafish in vivo. Further, we identify NIK as a critical negative regulator of beta cell function as pharmacological NIK activation results in impaired glucose-stimulated insulin secretion in mouse and human islets. NIK levels are elevated in pancreatic islets isolated from diet-induced obese (DIO) mice, which exhibit increased processing of non-canonical NF-κB components p100 to p52, and accumulation of RelB. Tumor necrosis factor α (TNFα) and receptor activator of NF-κB ligand (RANKL), two ligands associated with diabetes, induce NIK in islets. Mice with constitutive beta cell intrinsic NIK activation present impaired insulin secretion with DIO. NIK activation triggers the non-canonical NF-κB transcriptional network to induce genes identified in human type 2 diabetes genome-wide association studies linked to beta cell failure. These studies reveal that NIK contributes a central mechanism for beta cell failure in diet-induced obesity. We identify a role for Nuclear Factor inducing κB (NIK) in pancreatic beta cell failure. NIK activation disrupts glucose homeostasis in zebrafish in vivo and impairs glucose-stimulated insulin secretion in mouse and human islets in vitro. NIK activation also perturbs beta cell insulin secretion in a diet-induced obesity mouse model. These studies reveal that NIK contributes a central mechanism for beta cell failure in obesity. To uncover the role of NIK in pancreatic beta cells, we performed a gene expression microarray analysis comparing pancreatic islets with constitutive beta cell intrinsicNIK activation from the 16 week old mice (beta cell specific TRAF2 and TRAF2 knockout mice) to their controls (n=3 per group).

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Genetic recording of pancreatic beta cell proliferation

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