Disruption of glucose sensing and insulin secretion by ribozyme Kir6.2-gene targeting in insulin-secreting cells.
Authors:Li L, Rojas A, Wu J, Jiang C,
Journal:Endocrinology
PubMed ID:15166124
'The ATP-sensitive K+ (KATP) channel, composed of Kir6.2 and sulfonylurea receptor (SUR1), in pancreatic beta-cells is believed to serve as a metabolic sensor regulating insulin secretion according to glucose levels. Thus, genetic disruption of Kir6.2 expression may impair KATP channel function in glucose sensing and insulin secretion. Here we show ... More
The receptor for parathyroid hormone and parathyroid hormone-related peptide is hydrolyzed and its signaling properties are altered by directly binding the calpain small subunit.
Authors:Shimada M, Mahon MJ, Greer PA, Segre GV,
Journal:Endocrinology
PubMed ID:15691895
'We show calcium-dependent, direct binding between the N-terminal portion of the PTH/PTHrP receptor (PTH1R) C-terminal intracellular tail and the calpain small subunit. Binding requires, but may not be limited to, amino acids W474, S475, and W477. The wild-type, full-length rat (r) PTH1R, but not rPTH1R with W474A/W477A substitutions, copurifies with ... More
Authors:Zhang Y, Ma K, Sadana P, Chowdhury F, Gaillard S, Wang F, McDonnell DP, Unterman TG, Elam MB, Park EA,
Journal:J Biol Chem
PubMed ID:17079227
The pyruvate dehydrogenase complex (PDC) catalyzes the conversion of pyruvate to acetyl-CoA in mitochondria and is a key regulatory enzyme in the oxidation of glucose to acetyl-CoA. Phosphorylation of PDC by the pyruvate dehydrogenase kinases (PDK2 and PDK4) inhibits PDC activity. Expression of the PDK genes is elevated in diabetes ... More
Adipose-specific expression, phosphorylation of Ser794 in insulin receptor substrate-1, and activation in diabetic animals of salt-inducible kinase-2.
Authors:Horike N, Takemori H, Katoh Y, Doi J, Min L, Asano T, Sun XJ, Yamamoto H, Kasayama S, Muraoka M, Nonaka Y, Okamoto M,
Journal:J Biol Chem
PubMed ID:12624099
Salt-inducible kinase (SIK), first cloned from the adrenal glands of rats fed a high salt diet, is a serine/threonine protein kinase belonging to an AMP-activated protein kinase family. Induced in Y1 cells at an early stage of ACTH stimulation, it regulated the initial steps of steroidogenesis. Here we report the ... More