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2016 ; 59
(11
): 2280-2291
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IRS proteins and diabetic complications
#MMPMID27514532
Lavin DP
; White MF
; Brazil DP
Diabetologia
2016[Nov]; 59
(11
): 2280-2291
PMID27514532
show ga
IRS proteins are cellular adaptor molecules that mediate many of the key
metabolic actions of insulin. When tyrosine is phosphorylated by the activated
insulin receptor, IRS proteins recruit downstream effectors, such as
phosphoinositide 3-kinase and mitogen-activated protein kinase, in order to
elicit cellular responses such as glucose uptake, lipid metabolism and cell
proliferation. There are two main IRS proteins in humans (IRS1 and IRS2), both of
which are widely expressed. Given their central role in the insulin signalling
pathway, it is not surprising that male mice lacking Irs1 or Irs2 present with
elevated blood glucose or type 2 diabetes, respectively. For reasons yet to be
identified, female Irs2 (-/-) mice do not develop type 2 diabetes. A number of
organs are affected by complications of diabetes; macrovascular complications
include stroke and coronary artery disease, while nephropathy, neuropathy and
retinopathy fall into the category of microvascular complications. Given the
serious consequences of these complications on patient morbidity and mortality,
it is essential to identify the molecular pathogenesis underlying diabetic
complications, with a view to improving therapeutic intervention and patient
outcomes. A number of recently published papers have converged on the hypothesis
that the loss of insulin signalling and IRS proteins is instrumental to the
development and/or progression of diabetic complications. This review will
summarise some highlights from the published work in which this hypothesis is
discussed.