Chloride-dependent acceleration of cell cycle via modulation of Rb and cdc2 in osteoblastic cells.

Abstract:

:In the present study, we investigated if Cl(-) regulates the proliferation of the MC3T3-E1 osteoblastic cells. The proliferation of MC3T3-E1 osteoblastic cells was diminished by lowering the extracellular Cl(-) concentration ([Cl(-)](o)) in the culture medium. The lowered in [Cl(-)](o) increased the periods of the G(0)/G(1) and the G(2)/M phases in cell cycle. We further studied the effects of [Cl(-)](o) on the key enzymes, Rb and cdc2, playing key roles in checking points of the G(0)/G(1) and the G(2)/M phases in cell cycle. The lowered in [Cl(-)](o) diminished the active forms of enzymes, Rb and cdc2. We further found that the action of lowered [Cl(-)](o) on the cell proliferation, the cell cycle, Rb and cdc2 was abolished by the presence of 2mM glutamine, but not by that of pyruvate as another Krebs cycle substrate. Taken together, these observations indicate here for the first time that Cl(-) modulates Rb and cdc2, enhancing the proliferation of the MC3T3-E1 osteoblastic cells.

authors

Maki M,Miyazaki H,Nakajima K,Yamane J,Niisato N,Morihara T,Kubo T,Marunaka Y

doi

10.1016/j.bbrc.2007.07.131

subject

Has Abstract

pub_date

2007-10-05 00:00:00

pages

1038-43

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(07)01638-5

journal_volume

361

pub_type

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