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2016 ; 7
(ä): 11097
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English Wikipedia
Defects in TRPM7 channel function deregulate thrombopoiesis through altered
cellular Mg(2+) homeostasis and cytoskeletal architecture
#MMPMID27020697
Stritt S
; Nurden P
; Favier R
; Favier M
; Ferioli S
; Gotru SK
; van Eeuwijk JM
; Schulze H
; Nurden AT
; Lambert MP
; Turro E
; Burger-Stritt S
; Matsushita M
; Mittermeier L
; Ballerini P
; Zierler S
; Laffan MA
; Chubanov V
; Gudermann T
; Nieswandt B
; Braun A
Nat Commun
2016[Mar]; 7
(ä): 11097
PMID27020697
show ga
Mg(2+) plays a vital role in platelet function, but despite implications for
life-threatening conditions such as stroke or myocardial infarction, the
mechanisms controlling [Mg(2+)]i in megakaryocytes (MKs) and platelets are
largely unknown. Transient receptor potential melastatin-like 7 channel (TRPM7)
is a ubiquitous, constitutively active cation channel with a cytosolic ?-kinase
domain that is critical for embryonic development and cell survival. Here we
report that impaired channel function of TRPM7 in MKs causes
macrothrombocytopenia in mice (Trpm7(fl/fl-Pf4Cre)) and likely in several members
of a human pedigree that, in addition, suffer from atrial fibrillation. The
defect in platelet biogenesis is mainly caused by cytoskeletal alterations
resulting in impaired proplatelet formation by Trpm7(fl/fl-Pf4Cre) MKs, which is
rescued by Mg(2+) supplementation or chemical inhibition of non-muscle myosin IIA
heavy chain activity. Collectively, our findings reveal that TRPM7 dysfunction
may cause macrothrombocytopenia in humans and mice.