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10.1016/j.mce.2015.12.006

http://scihub22266oqcxt.onion/10.1016/j.mce.2015.12.006
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C4811673!4811673!26733150
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suck abstract from ncbi


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pmid26733150      Mol+Cell+Endocrinol 2016 ; 425 (ä): 48-60
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  • Increased IGFBP-1 phosphorylation in response to leucine deprivation is mediated by CK2 and PKC #MMPMID26733150
  • Malkani N; Biggar K; Shehab MA; Li S; Jansson T; Gupta MB
  • Mol Cell Endocrinol 2016[Apr]; 425 (ä): 48-60 PMID26733150show ga
  • Insulin-like growth factor binding protein-1 (IGFBP-1), secreted by fetal liver, is a key regulator of IGF-I bioavailability and fetal growth. IGFBP-1 phosphorylation decreases IGF-I bioavailability and diminishes its growth-promoting effects. Growth-restricted fetuses have decreased levels of circulating essential amino acids. We recently showed that IGFBP-1 hyperphosphorylation (pSer101/119/169) in response to leucine deprivation is regulated via activation of the amino acid response (AAR) in HepG2 cells. Here we investigated nutrient-sensitive protein kinases CK2/PKC/PKA in mediating IGFBP-1 phosphorylation in leucine deprivation. We demonstrated that leucine deprivation stimulated CK2 activity (enzymatic assay) and induced IGFBP-1 phosphorylation (immunoblotting/MRM-MS). Inhibition (pharmacological/siRNA) of CK2/PKC, but not PKA, prevented IGFBP-1 hyperphosphorylation in leucine deprivation. PKC inhibition also prevented leucine deprivation-stimulated CK2 activity. Functionally, leucine deprivation decreased IGF-I-induced-IGF-1R autophosphorylation when CK2/PKC were not inhibited. Our data strongly support that PKC promotes leucine deprivation-induced IGFBP-1 hyperphosphorylation via CK2 activation, mechanistically linking decreased amino acid availability and reduced fetal growth.
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