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2007 ; 40
(6
): 849-65
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Importance of melastatin-like transient receptor potential 7 and cations
(magnesium, calcium) in human osteoblast-like cell proliferation
#MMPMID18021175
Abed E
; Moreau R
Cell Prolif
2007[Dec]; 40
(6
): 849-65
PMID18021175
show ga
Bone tissue in the adult is continuously being remodelled, and overall bone mass
is maintained constant by the balance between osteoclastic bone resorption and
osteoblastic bone formation. Adequate osteoblastic proliferation is essential for
both appropriate formation and for regulation of resorption, and thereby the
maintenance of bone remodelling equilibrium. OBJECTIVES: Here, we have
investigated the roles of melastatin-like transient receptor potential 6 and 7
(TRPM6, TRPM7), which are calcium (Ca2+) and magnesium (Mg2+) conducting
channels, during proliferation of human osteoblasts. RESULTS: Genetic expression
of TRPM6 and TRPM7 was shown in human osteoblast-like MG-63, SaOS and U2-OS
cells, and reduction of extracellular Mg2+ or Ca2+ led to a decrease of cell
proliferation. Concomitant reduction of both ions further accentuated reduction
of cell proliferation. Expression of TRPM7 channels was increased under
conditions of reduced extracellular Mg2+ and Ca2+ levels whereas expression of
TRPM6 was not modified, suggesting compensatory mechanisms afforded by TRPM7 in
order to maintain intracellular ion homeostasis. Pre-incubation of cells in
reduced extracellular Mg2+ conditions led to activation of Ca2+ and Mg2+ influx.
Reduction of TRPM7 expression by specific siRNA prevented latter influx and
inhibited cell proliferation. CONCLUSIONS: Our results indicate that
extracellular Mg2+ and Ca2+ deficiency reduces the proliferation of human
osteoblastic cells. Expression and activity of TRPM7 is modulated by
extracellular Mg2+ and Ca2+ availability, indicating that TRPM7 channels are
involved in intracellular ion homeostasis and proliferation of osteoblasts.