Journal
DIABETOLOGIA
Volume 53, Issue 2, Pages 229-233Publisher
SPRINGER
DOI: 10.1007/s00125-009-1558-6
Keywords
Cancer; Farnesyltransferase; Hyperinsulinaemia; Insulin resistance; Mitogenic action
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Either endogenous or exogenous hyperinsulinaemia in the setting of insulin resistance promotes phosphorylation and activation of farnesyltransferase, a ubiquitous enzyme that farnesylates Ras proteins. Increased availability of farnesylated Ras at the plasma membrane enhances mitogenic responsiveness of cells to various growth factors, thus contributing to progression of cancer and atherosclerosis. This effect is specific to insulin, but is not related to the type of insulin used. The stimulatory effect of hyperinsulinaemia on farnesyltransferase in the presence of insulin resistance represents one potential mechanism responsible for mitogenicity and atherogenicity of insulin.
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