ArticleEndocrinology2026
eNAMPT induces alpha-cell mass expansion but impaired glucagon counter regulatory response.
Article in Endocrinology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
1 citing paper in PubMed.
- eNAMPT induces alpha-cell mass expansion but impaired glucagon counter regulatory response.Endocrinology · 2026Article
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Authors and funding
11 authors.
Funding
Abstract
contextLoss of functional beta-cell mass, coupled with alpha-cell dysfunction are key factors in pathophysiology of type 1 and type 2 diabetes. We have reported that extracellular nicotinamide phosphoribosyltransferase (eNAMPT) is elevated in type 2 diabetes and that elevated eNAMPT levels promote beta-cell dysfunction.
objectiveTo further investigate the effects of eNAMPT on beta-cell mass.
methodsIslets isolated from CD1 and Ins1tm1.1(cre)Thor+/-; mTmGfl/- mice and human donors were exposed to eNAMPT (48-96 hours). CD1 mice were administered eNAMPT for 14 days. Alpha-, beta-, and delta-cell numbers were determined by glucagon, insulin, and somatostatin staining, respectively. Alpha-cell proliferation was assessed by bromodeoxyuridine (BrDU) uptake and Ki67 expression. Glucagon secretion was assessed via radioimmunoassay. Trans-differentiation was assessed by determining changes in presence of bi-hormonal cells in CD1/human islets and using Ins1tm1.1(cre)Thor+/-; mTmGfl/- islets to determine changes in GLU+/GFP+ and GLU+/TdT+ cells.
resultseNAMPT treatment reduced beta-cell number and induced corresponding increases in alpha-cell number. Indicative of beta- to alpha-cell trans-differentiation eNAMPT induced increased presence of bi-hormonal INS+/GLU+ cells and PDX1+/GLU+ cells, and increased GLU+/GFP+ cells in Ins1tm1.1(cre)Thor+/-; mTmGfl/- mouse islets. In addition, eNAMPT induced alpha-cell proliferation, indicated by increased BrDU uptake. Despite marked elevation in alpha-cell number, alpha-cell function was compromised following eNAMPT exposure, indicated by impaired glucagon counterregulatory response (CCR) to low glucose levels.
conclusionThis data supports a role for elevated eNAMPT levels in driving increased alpha-cell mass via a combination of beta- to alpha-cell trans-differentiation and alpha-cell proliferation. When combined with observed impaired CCR, these data have implications for both type 1 and type 2 diabetes pathophysiology.
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