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2017 ; 7
(1
): 8806
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TRPM6 and TRPM7 differentially contribute to the relief of heteromeric TRPM6/7
channels from inhibition by cytosolic Mg(2+) and Mg·ATP
#MMPMID28821869
Ferioli S
; Zierler S
; Zaißerer J
; Schredelseker J
; Gudermann T
; Chubanov V
Sci Rep
2017[Aug]; 7
(1
): 8806
PMID28821869
show ga
TRPM6 and its homologue TRPM7 are ?-kinase-coupled divalent cation-selective
channels activated upon reduction of cytosolic levels of Mg(2+) and Mg·ATP. TRPM6
is vital for organismal Mg(2+) balance. However, mechanistically the cellular
role and functional nonredundancy of TRPM6 remain incompletely understood.
Comparative analysis of native currents in primary cells from TRPM6- versus
TRPM7-deficient mice supported the concept that native TRPM6 primarily functions
as a constituent of heteromeric TRPM6/7 channels. However, heterologous
expression of the human TRPM6 protein engendered controversial results with
respect to channel characteristics including its regulation by Mg(2+) and Mg·ATP.
To resolve this issue, we cloned the mouse TRPM6 (mTRPM6) cDNA and compared its
functional characteristics to mouse TRPM7 (mTRPM7) after heterologous expression.
Notably, we observed that mTRPM6 and mTRPM7 differentially regulate properties of
heteromeric mTRPM6/7 channels: In the presence of mTRPM7, the extreme sensitivity
of functionally expressed homomeric mTRPM6 to Mg(2+) is tuned to higher
concentrations, whereas mTRPM6 relieves mTRPM7 from the tight inhibition by
Mg·ATP. Consequently, the association of mTRPM6 with mTRPM7 allows for high
constitutive activity of mTRPM6/7 in the presence of physiological levels of
Mg(2+) and Mg·ATP, thus laying the mechanistic foundation for constant vectorial
Mg(2+) transport specifically into epithelial cells.