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2017 ; 28
(6
): 834-842
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Cryptochromes regulate IGF-1 production and signaling through control of
JAK2-dependent STAT5B phosphorylation
#MMPMID28100634
Chaudhari A
; Gupta R
; Patel S
; Velingkaar N
; Kondratov R
Mol Biol Cell
2017[Mar]; 28
(6
): 834-842
PMID28100634
show ga
Insulin-like growth factor (IGF) signaling plays an important role in cell growth
and proliferation and is implicated in regulation of cancer, metabolism, and
aging. Here we report that IGF-1 level in blood and IGF-1 signaling demonstrates
circadian rhythms. Circadian control occurs through cryptochromes
(CRYs)-transcriptional repressors and components of the circadian clock. IGF-1
rhythms are disrupted in Cry-deficient mice, and IGF-1 level is reduced by 80% in
these mice, which leads to reduced IGF signaling. In agreement, Cry-deficient
mice have reduced body (?30% reduction) and organ size. Down-regulation of IGF-1
upon Cry deficiency correlates with reduced Igf-1 mRNA expression in the liver
and skeletal muscles. Igf-1 transcription is regulated through growth
hormone-induced, JAK2 kinase-mediated phosphorylation of transcriptional factor
STAT5B. The phosphorylation of STAT5B on the JAK2-dependent Y699 site is
significantly reduced in the liver and skeletal muscles of Cry-deficient mice. At
the same time, phosphorylation of JAK2 kinase was not reduced upon Cry
deficiency, which places CRY activity downstream from JAK2. Thus CRYs link the
circadian clock and JAK-STAT signaling through control of STAT5B phosphorylation,
which provides the mechanism for circadian rhythms in IGF signaling in vivo.