insulin resistance/tyrosine

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Defect in tyrosine kinase activity of the insulin receptor from a patient with insulin resistance and acanthosis nigricans.

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We report here a defect in tyrosine kinase activity of the insulin receptor from an insulin-resistant patient with acanthosis nigricans using cultured Ebstein-Barr virus (EBV)-transformed B-lymphocytes. As judged by affinity labeling and immunoblotting, the alpha- and beta-subunits of insulin

A novel protein tyrosine phosphatase 1 B inhibitor-geranylated flavonoid from mulberry leaves ameliorates insulin resistance

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Mulberry leaf is a common vegetable with a variety of beneficial effects, such as hypoglycemic activity. However, the underlying mechanism of its hypoglycemic effect have not been fully revealed. In this study, two flavonoid derivatives were isolated from mulberry leaves, a new geranylated flavonoid

Insulin resistance induced by hyperinsulinemia coincides with a persistent alteration at the insulin receptor tyrosine kinase domain.

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Insulin resistance, the diminished response of target tissues to insulin, is associated with the metabolic syndrome and a predisposition towards diabetes in a growing proportion of the worldwide population. Under insulin resistant states, the cellular response of the insulin signaling pathway is

[Effects of insulin receptor substrate-1 and its serine phosphorylation and tyrosine phosphorylation on insulin resistance in skeletal muscle cells in the state of sepsis: experiment with rats].

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OBJECTIVE To investigate the effects of insulin receptor substrate (IRS)-1 and its serine (Ser)(307) phosphorylation and tyrosine (Tyr) phosphorylation on insulin resistance in skeletal muscle cells in the state of sepsis. METHODS 120 SD rats were randomly divided into 3 groups: 10% group, with 10%

A novel protein tyrosine phosphatase 1B inhibitor with therapeutic potential for insulin resistance.

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Insulin-sensitizing drugs are currently limited, and identifying new candidates is a challenge. Protein tyrosine phosphatase 1B (PTP1B) negatively regulates insulin signalling, and its inhibition is anticipated to improve insulin resistance. Here, the pharmacological properties of CX08005, a novel

Production of inhibitor of insulin-receptor tyrosine kinase in fibroblasts from patient with insulin resistance and NIDDM.

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Although non-insulin-dependent diabetes mellitus (NIDDM) is associated with defects in insulin action, the molecular basis of this resistance is unknown. We studied fibroblasts from a markedly insulin-resistant patient with NIDDM but without acanthosis nigricans. Her fibroblasts were resistant to

Intact adipocyte insulin-receptor phosphorylation and in vitro tyrosine kinase activity in animal models of insulin resistance.

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We evaluated the possibility that impaired insulin-receptor kinase activity contributes to insulin resistance by examining in vitro receptor tyrosine kinase activity and in situ receptor phosphorylation in four models of insulin resistance. Adipocytes from streptozocin-induced nonketotic diabetic

Molecular mechanism of angiotensin II-induced insulin resistance in aortic vascular smooth muscle cells: roles of Protein Tyrosine Phosphatase-1B.

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Insulin resistance is an underlying mechanism of type 2 diabetes and its vascular complications. Recent evidence suggests that crosstalk between angiotensin II (Ang II) and the insulin signaling in vascular smooth muscle cell (VSMC) may contribute to cellular insulin resistance. We hypothesized that

Tyrosine kinase activity of the insulin receptor of patients with type A extreme insulin resistance: studies with circulating mononuclear cells and cultured lymphocytes.

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The syndrome of type A insulin resistance in nonobese women is characterized by hyperinsulinemia, resistance to exogenous insulin, acanthosis nigricans, polycystic ovaries, and masculinization. Insulin binding to intact circulating monocytes and cultured Epstein-Barr virus-transformed B-lymphocytes

Leptin increases hepatic insulin sensitivity and protein tyrosine phosphatase 1B expression.

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Leptin has been shown to improve insulin sensitivity and glucose metabolism in obese diabetic ob/ob mice, yet the mechanisms remain poorly defined. We found that 2 d of leptin treatment improved fasting but not postprandial glucose homeostasis, suggesting enhanced hepatic insulin sensitivity.

Protein-tyrosine phosphatase 1B deficiency reduces insulin resistance and the diabetic phenotype in mice with polygenic insulin resistance.

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Mice heterozygous for insulin receptor (IR) and IR substrate (IRS)-1 deficiency provide a model of polygenic type 2 diabetes in which early-onset, genetically programmed insulin resistance leads to diabetes. Protein-tyrosine phosphatase 1B (PTP1B) dephosphorylates tyrosine residues in IR and

Protein-tyrosine phosphatases are involved in interferon resistance associated with insulin resistance in HepG2 cells and obese mice.

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Insulin resistance is a risk factor for non-response to interferon/ribavirin therapy in patients with chronic hepatitis C. The aim of this study was to determine the role played by protein-tyrosine phosphatases (PTPs) in the absence of interferon-α (IFNα) response associated with insulin resistance.

Tyrosine hydroxylase gene microsatellite polymorphism associated with insulin resistance in depressive disorder.

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A high association between type 2 diabetes mellitus and depressive illness has been reported. Insulin resistance during depressive illness might contribute to the linkage between depression and type 2 diabetes. To determine whether the genetic polymorphisms of the tyrosine hydroxylase ([TH] HUMTH01)

Alterations in specific protein-tyrosine phosphatases accompany insulin resistance of streptozotocin diabetes.

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To test whether protein tyrosine phosphatases (PTPases) may play a role in the insulin resistance of insulinopenic diabetes, we assessed PTPase activity as well as the protein and mRNA abundance of three major candidate PTPases in subcellular fractions of liver and skeletal muscle of

Inducible nitric oxide synthase induction underlies lipid-induced hepatic insulin resistance in mice: potential role of tyrosine nitration of insulin signaling proteins.

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OBJECTIVE The present study was undertaken to assess the contribution of inducible nitric oxide (NO) synthase (iNOS) to lipid-induced insulin resistance in vivo. METHODS Wild-type and iNOS(-/-) mice were infused for 6 h with a 20% intralipid emulsion, during which a hyperinsulinemic-euglycemic clamp

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