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β-Cell Mass and Turnover in Humans Effects of obesity and aging
Published Web Locationhttps://doi.org/10.2337/dc12-0421
ObjectiveWe sought to establish β-cell mass, β-cell apoptosis, and β-cell replication in humans in response to obesity and advanced age.
Research design and methodsWe examined human autopsy pancreas from 167 nondiabetic individuals 20-102 years of age. The effect of obesity on β-cell mass was examined in 53 lean and 61 obese subjects, and the effect of aging was examined in 106 lean subjects.
Resultsβ-Cell mass is increased by ~50% with obesity (from 0.8 to 1.2 g). With advanced aging, the exocrine pancreas undergoes atrophy but β-cell mass is remarkably preserved. There is minimal β-cell replication or apoptosis in lean humans throughout life with no detectable changes with obesity or advanced age.
Conclusionsβ-Cell mass in human obesity increases by ~50% by an increase in β-cell number, the source of which is unknown. β-Cell mass is well preserved in humans with advanced aging.
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