Modulation of responses to TGF-beta by 1, 25 dihydroxyvitamin D3 in MG-63 osteoblastic cells: possible involvement of regulation of TGF-beta type II receptor.
The effect of TGF-beta 1 on the expression of alkaline phosphatase (ALPase) activity was examined during osteoblastic cell line (MG-63) differentiation induced by 1,25-dihydroxyvitamin D3 (1,25D3). TGF-beta 1 and 1,25D3 were found to enhance ALPase activity. However, preincubation of the cells with 1,25D3 transiently abolished the effects of TGF- beta 1. Kinetics of the complex responses to TGF- beta 1 and 1,25D3 were found to correlate well with that of the expression level of type II receptor for TGF- beta. These results suggest that 1,25D3 may regulate the cellular responses to TGF- beta 1 in part via regulation of functional receptor for TGF- beta.
Iimura
T
T
Department of Biochemistry, Faculty of Dentistry, Tokyo Medical and Dental University, Japan.
Oida
S
S
Ichijo
H
H
Goseki
M
M
Maruoka
Y
Y
Takeda
K
K
Sasaki
S
S
D000469:Alkaline Phosphatase / Q000378:metabolism; D002117:Calcitriol / Q000494:pharmacology*; D002454:Cell Differentiation; D006801:Humans; D010006:Osteoblasts / Q000187:drug effects* / Q000201:enzymology; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D018125:Receptors, Transforming Growth Factor beta / Q000235:genetics / Q000502:physiology*; D016212:Transforming Growth Factor beta / Q000502:physiology*; D014407:Tumor Cells, Cultured
D012333:RNA, Messenger; D018125:Receptors, Transforming Growth Factor beta; D016212:Transforming Growth Factor beta; D000469:Alkaline Phosphatase; D002117:Calcitriol