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2014 ; 28
(9
): 1435-47
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Activated FoxM1 attenuates streptozotocin-mediated ?-cell death
#MMPMID25073103
Golson ML
; Maulis MF
; Dunn JC
; Poffenberger G
; Schug J
; Kaestner KH
; Gannon MA
Mol Endocrinol
2014[Sep]; 28
(9
): 1435-47
PMID25073103
show ga
The forkhead box transcription factor FoxM1, a positive regulator of the cell
cycle, is required for ?-cell mass expansion postnatally, during pregnancy, and
after partial pancreatectomy. Up-regulation of full-length FoxM1, however, is
unable to stimulate increases in ?-cell mass in unstressed mice or after partial
pancreatectomy, probably due to the lack of posttranslational activation. We
hypothesized that expression of an activated form of FoxM1 could aid in recovery
after ?-cell injury. We therefore derived transgenic mice that inducibly express
an activated version of FoxM1 in ?-cells (RIP-rtTA;TetO-hemagglutinin
(HA)-Foxm1(?)(NRD) mice). This N-terminally truncated form of FoxM1 bypasses 2
posttranslational controls: exposure of the forkhead DNA binding domain and
targeted proteasomal degradation. Transgenic mice were subjected to
streptozotocin (STZ)-induced ?-cell ablation to test whether activated FoxM1 can
promote ?-cell regeneration. Mice expressing HA-FoxM1(?NRD) displayed decreased
ad libitum-fed blood glucose and increased ?-cell mass. ?-Cell proliferation was
actually decreased in RIP-rtTA:TetO-HA-Foxm1(NRD) mice compared with that in
RIP-rtTA mice 7 days after STZ treatment. Unexpectedly, ?-cell death was
decreased 2 days after STZ treatment. RNA sequencing analysis indicated that
activated FoxM1 alters the expression of extracellular matrix and immune cell
gene profiles, which may protect against STZ-mediated death. These studies
highlight a previously underappreciated role for FoxM1 in promoting ?-cell
survival.