Since inhibition of protein tyrosine phosphatase (PTPase) activity by peroxovanadate (pV) affects insulin release and phosphorylation of pancreatic islet proteins in the insulin signaling pathway, we studied whether pV also modulates glucagon release. At 3.3mM glucose, pV (0.1-1mM) enhanced glucagon
Protein tyrosine phosphatases (PTPs) play important roles in cell growth and differentiation of normal and tumor cells. In this study, we analyzed the PTP profile in two pancreatic islet tumor cell lines. Transcripts were isolated from alphaTC-1 (glucagon-secreting) and betaTC-1 (insulin-secreting)
A novel cDNA, IA-2beta, was isolated from a mouse neonatal brain library. The predicted protein sequence revealed an extracellular domain, a transmembrane region, and an intracellular domain. The intracellular domain is 376 amino acids long and 74% identical to the intracellular domain of IA-2, a
In this study, we describe the isolation, expression, and characterization of a new member of the transmembrane protein tyrosine phosphatase family from human brain, designated IA-2 beta. The 3853-bp cDNA encodes 986 amino acids with a molecular mass of 108,044 daltons (a predicted pI value of 5.8).
A newly recognized disease in dogs, ulcerative dermatosis associated with diabetes mellitus (diabetic dermatopathy), was diagnosed in 2 dogs with pancreatic endocrine tumors that had immunohistologic evidence of glucagon production. Dogs developed diabetes mellitus in the later stages of the
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