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2014 ; 4
(ä): 7599
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Elucidating the role of the TRPM7 alpha-kinase: TRPM7 kinase inactivation leads
to magnesium deprivation resistance phenotype in mice
#MMPMID25534891
Ryazanova LV
; Hu Z
; Suzuki S
; Chubanov V
; Fleig A
; Ryazanov AG
Sci Rep
2014[Dec]; 4
(ä): 7599
PMID25534891
show ga
TRPM7 is an unusual bi-functional protein containing an ion channel covalently
linked to a protein kinase domain. TRPM7 is implicated in regulating cellular and
systemic magnesium homeostasis. While the biophysical properties of TRPM7 ion
channel and its function are relatively well characterized, the function of the
TRPM7 enzymatically active kinase domain is not understood yet. To investigate
the physiological role of TRPM7 kinase activity, we constructed mice carrying an
inactive TRPM7 kinase. We found that these mice were resistant to dietary
magnesium deprivation, surviving three times longer than wild type mice; also
they displayed decreased chemically induced allergic reaction. Interestingly,
mutant mice have lower magnesium bone content compared to wild type mice when fed
regular diet; unlike wild type mice, mutant mice placed on magnesium-depleted
diet did not alter their bone magnesium content. Furthermore, mouse embryonic
fibroblasts isolated from TRPM7 kinase-dead animals exhibited increased
resistance to magnesium deprivation and oxidative stress. Finally,
electrophysiological data revealed that the activity of the kinase-dead TRPM7
channel was not significantly altered. Together, our results suggest that TRPM7
kinase is a sensor of magnesium status and provides coordination of cellular and
systemic responses to magnesium deprivation.