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2012 ; 109
(28
): 11324-9
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Loss of insulin-induced activation of TRPM6 magnesium channels results in
impaired glucose tolerance during pregnancy
#MMPMID22733750
Nair AV
; Hocher B
; Verkaart S
; van Zeeland F
; Pfab T
; Slowinski T
; Chen YP
; Schlingmann KP
; Schaller A
; Gallati S
; Bindels RJ
; Konrad M
; Hoenderop JG
Proc Natl Acad Sci U S A
2012[Jul]; 109
(28
): 11324-9
PMID22733750
show ga
Hypomagnesemia affects insulin resistance and is a risk factor for diabetes
mellitus type 2 (DM2) and gestational diabetes mellitus (GDM). Two single
nucleotide polymorphisms (SNPs) in the epithelial magnesium channel TRPM6
(V(1393)I, K(1584)E) were predicted to confer susceptibility for DM2. Here, we
show using patch clamp analysis and total internal reflection fluorescence
microscopy, that insulin stimulates TRPM6 activity via a phosphoinositide
3-kinase and Rac1-mediated elevation of cell surface expression of TRPM6.
Interestingly, insulin failed to activate the genetic variants TRPM6(V(1393)I)
and TRPM6(K(1584)E), which is likely due to the inability of the insulin
signaling pathway to phosphorylate TRPM6(T(1391)) and TRPM6(S(1583)). Moreover,
by measuring total glycosylated hemoglobin (TGH) in 997 pregnant women as a
measure of glucose control, we demonstrate that TRPM6(V(1393)I) and
TRPM6(K(1584)E) are associated with higher TGH and confer a higher likelihood of
developing GDM. The impaired response of TRPM6(V(1393)I) and TRPM6(K(1584)E) to
insulin represents a unique molecular pathway leading to GDM where the defect is
located in TRPM6.