The FOXP1, FOXP2 and FOXP4 transcription factors are required for islet alpha cell proliferation and function in mice

Diabetologia. 2015 Aug;58(8):1836-44. doi: 10.1007/s00125-015-3635-3. Epub 2015 May 29.


Aims/hypothesis: Several forkhead box (FOX) transcription factor family members have important roles in controlling pancreatic cell fates and maintaining beta cell mass and function, including FOXA1, FOXA2 and FOXM1. In this study we have examined the importance of FOXP1, FOXP2 and FOXP4 of the FOXP subfamily in islet cell development and function.

Methods: Mice harbouring floxed alleles for Foxp1, Foxp2 and Foxp4 were crossed with pan-endocrine Pax6-Cre transgenic mice to generate single and compound Foxp mutant mice. Mice were monitored for changes in glucose tolerance by IPGTT, serum insulin and glucagon levels by radioimmunoassay, and endocrine cell development and proliferation by immunohistochemistry. Gene expression and glucose-stimulated hormone secretion experiments were performed with isolated islets.

Results: Only the triple-compound Foxp1/2/4 conditional knockout (cKO) mutant had an overt islet phenotype, manifested physiologically by hypoglycaemia and hypoglucagonaemia. This resulted from the reduction in glucagon-secreting alpha cell mass and function. The proliferation of alpha cells was profoundly reduced in Foxp1/2/4 cKO islets through the effects on mediators of replication (i.e. decreased Ccna2, Ccnb1 and Ccnd2 activators, and increased Cdkn1a inhibitor). Adult islet Foxp1/2/4 cKO beta cells secrete insulin normally while the remaining alpha cells have impaired glucagon secretion.

Conclusions/interpretation: Collectively, these findings reveal an important role for the FOXP1, 2, and 4 proteins in governing postnatal alpha cell expansion and function.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Animals
  • Cell Proliferation*
  • Forkhead Transcription Factors / genetics
  • Forkhead Transcription Factors / metabolism*
  • Glucagon / blood
  • Glucagon-Secreting Cells / cytology
  • Glucagon-Secreting Cells / metabolism*
  • Insulin / blood
  • Mice
  • Mice, Transgenic
  • Repressor Proteins / genetics
  • Repressor Proteins / metabolism*


  • Forkhead Transcription Factors
  • Foxp1 protein, mouse
  • Foxp2 protein, mouse
  • Foxp4 protein, mouse
  • Insulin
  • Repressor Proteins
  • Glucagon