Leptin activates PI-3 kinase in C2C12 myotubes via janus kinase-2 (JAK-2) and insulin receptor substrate-2 (IRS-2) dependent pathways
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چکیده
منابع مشابه
The leptin receptor activates janus kinase 2 and signals for proliferation in a factor-dependent cell line.
The antiobesity effects of leptin are mediated by the obese receptor (OB-R), a member of the cytokine receptor superfamily. Several isoforms of OB-R that differ in the length of the cytoplasmic domain have been described. An isoform with a long cytoplasmic domain of 302 amino acids, termed OB-Rb, contains the conserved box 1 and box 2 motifs and is likely to be responsible for leptin-induced si...
متن کاملJanus kinase 2: an epigenetic 'writer' that activates leukemogenic genes.
Activation of Janus kinase 2 (JAK2) plays a critical role in normal hematopoiesis and leukemogenesis. Dawson et al. (2009; JAK2 phosphorylates histone H3Y41 and excludes HP1alpha from chromatin. Nature 461, 819-822) report that JAK2 performs this function by displacing the heterochromatin protein HP1α from chromatin through phosphorylation of histone H3.
متن کاملCalorie restriction increases muscle insulin action but not IRS-1-, IRS-2-, or phosphotyrosine-PI 3-kinase.
Skeletal muscle insulin sensitivity improves with a moderate reduction in caloric intake. We studied possible mechanisms in calorie-restricted [CR: 60% ad libitum (AL) intake] compared with AL rats, utilizing a time-matched feeding protocol (3, 5, 10, or 20 days). Visceral fat mass was lower for CR vs. AL at 10 and 20 days, but insulin-stimulated muscle 3-O-methylglucose transport was higher in...
متن کاملInsufficiency of Janus Kinase 2–Autonomous Leptin Receptor Signals for Most Physiologic Leptin Actions
OBJECTIVE Leptin acts via its receptor (LepRb) to signal the status of body energy stores. Leptin binding to LepRb initiates signaling by activating the associated Janus kinase 2 (Jak2) tyrosine kinase, which promotes the phosphorylation of tyrosine residues on the intracellular tail of LepRb. Two previously examined LepRb phosphorylation sites mediate several, but not all, aspects of leptin ac...
متن کاملLeptin receptor signaling via Janus kinase 2/Signal transducer and activator of transcription 3 impacts on ovarian cancer cell phenotypes
Ovarian cancer is a leading cause of cancer mortality in women world-wide. Considerable progress has been made to characterize the different subtypes of ovarian cancer, but specific therapies remain limited and prognosis poor. Cytokine signaling via the interleukin-6 receptor (IL-6R) family and related receptors has been implicated in a number of cancers, including those with an ovarian origin....
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ژورنال
عنوان ژورنال: Diabetologia
سال: 1997
ISSN: 0012-186X,1432-0428
DOI: 10.1007/s001250050832