PMID- 23959366 OWN - NLM STAT- MEDLINE DCOM- 20140404 LR - 20220408 IS - 1759-5037 (Electronic) IS - 1759-5029 (Linking) VI - 9 IP - 10 DP - 2013 Oct TI - The role of FOXO1 in beta-cell failure and type 2 diabetes mellitus. PG - 615-23 LID - 10.1038/nrendo.2013.157 [doi] AB - Over the past two decades, insulin resistance has been considered essential to the aetiology of type 2 diabetes mellitus (T2DM). However, insulin resistance does not lead to T2DM unless it is accompanied by pancreatic beta-cell dysfunction, because healthy beta cells can compensate for insulin resistance by increasing in number and functional output. Furthermore, beta-cell mass is decreased in patients with diabetes mellitus, suggesting a primary role for beta-cell dysfunction in the pathogenesis of T2DM. The dysfunction of beta cells can develop through various mechanisms, including oxidative, endoplasmic reticulum or hypoxic stress, as well as via induction of cytokines; these processes lead to apoptosis, uncontrolled autophagy and failure to proliferate. Transdifferentiation between beta cells and alpha cells occurs under certain pathological conditions, and emerging evidence suggests that beta-cell dedifferentiation or transdifferentiation might account for the reduction in beta-cell mass observed in patients with severe T2DM. FOXO1, a key transcription factor in insulin signalling, is implicated in these mechanisms. This Review discusses advances in our understanding of the contribution of FOXO1 signalling to the development of beta-cell failure in T2DM. FAU - Kitamura, Tadahiro AU - Kitamura T AD - Metabolic Signal Research Centre, Institute for Molecular and Cellular Regulation, Gunma University, 3-39-15, Showa-machi, Maebashi, Gunma 371-8512, Japan. kitamura@gunma-u.ac.jp. LA - eng PT - Journal Article PT - Review DEP - 20130820 PL - England TA - Nat Rev Endocrinol JT - Nature reviews. Endocrinology JID - 101500078 RN - 0 (FOXO1 protein, human) RN - 0 (Forkhead Box Protein O1) RN - 0 (Forkhead Transcription Factors) SB - IM MH - Diabetes Mellitus, Type 2/*metabolism/*pathology MH - Forkhead Box Protein O1 MH - Forkhead Transcription Factors/genetics/*metabolism MH - Humans MH - Insulin-Secreting Cells/*metabolism/*pathology MH - Oxidative Stress/physiology EDAT- 2013/08/21 06:00 MHDA- 2014/04/05 06:00 CRDT- 2013/08/21 06:00 PHST- 2013/08/21 06:00 [entrez] PHST- 2013/08/21 06:00 [pubmed] PHST- 2014/04/05 06:00 [medline] AID - nrendo.2013.157 [pii] AID - 10.1038/nrendo.2013.157 [doi] PST - ppublish SO - Nat Rev Endocrinol. 2013 Oct;9(10):615-23. doi: 10.1038/nrendo.2013.157. Epub 2013 Aug 20.