Weaning triggers a maturation step of pancreatic β cells

Dev Cell. 2015 Mar 9;32(5):535-45. doi: 10.1016/j.devcel.2015.01.002. Epub 2015 Feb 5.


Because tissue regeneration deteriorates with age, it is generally assumed that the younger the animal, the better it compensates for tissue damage. We have examined the effect of young age on compensatory proliferation of pancreatic β cells in vivo. Surprisingly, β cells in suckling mice fail to enter the cell division cycle in response to a diabetogenic injury or increased glycolysis. The potential of β cells for compensatory proliferation is acquired following premature weaning to normal chow, but not to a diet mimicking maternal milk. In addition, weaning coincides with enhanced glucose-stimulated oxidative phosphorylation and insulin secretion from islets. Transcriptome analysis reveals that weaning increases the expression of genes involved in replication licensing, suggesting a mechanism for increased responsiveness to the mitogenic activity of high glucose. We propose that weaning triggers a discrete maturation step of β cells, elevating both the mitogenic and secretory response to glucose.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Apoptosis
  • Biomarkers / metabolism*
  • Blotting, Western
  • Cell Proliferation*
  • Cells, Cultured
  • Female
  • Gene Expression Profiling
  • Glucose / pharmacology*
  • Hypoglycemic Agents / pharmacology
  • Immunoenzyme Techniques
  • Insulin / pharmacology*
  • Insulin-Secreting Cells / cytology
  • Insulin-Secreting Cells / drug effects
  • Insulin-Secreting Cells / metabolism
  • Islets of Langerhans / cytology*
  • Islets of Langerhans / drug effects
  • Islets of Langerhans / metabolism
  • Male
  • Mice
  • Mice, Inbred ICR
  • Mice, Transgenic
  • Oligonucleotide Array Sequence Analysis
  • RNA, Messenger / genetics
  • Real-Time Polymerase Chain Reaction
  • Reverse Transcriptase Polymerase Chain Reaction
  • Weaning*


  • Biomarkers
  • Hypoglycemic Agents
  • Insulin
  • RNA, Messenger
  • Glucose

Associated data

  • GEO/GSE64524