Lilly lecture 1990. Molecular defects in diabetes mellitus - PubMed (original) (raw)

Review

Lilly lecture 1990. Molecular defects in diabetes mellitus

G I Bell. Diabetes. 1991 Apr.

Abstract

The application of molecular biology to problems in diabetes mellitus has begun to reveal the underlying molecular defects contributing to the development of hyperglycemia. Islet amyloid represents the most common pathological lesion occurring in the islets of NIDDM subjects. The use of both biochemistry and molecular biology has lead to the identification of the major protein component of human islet amyloid and elucidation of the structure of its precursor. This protein, termed islet amyloid polypeptide, is related to two neuropeptides, calcitonin gene-related peptides 1 and 2, and represents a new beta-cell secretory product whose normal physiological function remains to be determined. The use of molecular biology has also led to a better understanding of the molecular defects contributing to insulin resistance. Characterization of the insulin-receptor gene in patients with extreme forms of insulin resistance has resulted in the identification of mutations that impair its function and lead to tissue resistance to the action of insulin. Molecular biological approaches have also led to a better understanding of the regulation of glucose transport. They have revealed that there is a family of structurally related proteins encoded by distinct genes and expressed in a tissue-specific manner that are responsible for the transport of glucose across the plasma membrane. Moreover, they have shown that specific depletion of the glucose-transporter isoform that mediates insulin-stimulated glucose transport is responsible for decreased transport activity in adipose tissue in insulin-resistant states.

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Lilly lecture 1990. Molecular defects in diabetes mellitus - PubMed (original) (raw)