Abstract:
:We have studied the effects of rhTGF-beta2, dexamethanosome (dex) and 1,25(OH)2D3 on human bone marrow stromal (HBMS) cells in long-term culture. A fraction on HBMS expressed type I collagen (Col I) and osteopontin, and transient treatment (48 h) with dex increased the number of alkaline phosphatase (ALP) positive cells. Treatment with rhTGF-beta2 inhibited DNA synthesis and attenuated the stimulatory effect of dex on cell growth at 3-4 weeks of culture. 1,25(OH)2D3 inhibited DNA synthesis at 1-4 weeks, and dex partially blocked the inhibitory effect of 1,25(OH)2D3 on cell growth. rhTGF-beta2 and dex increased Col I synthesis at 1 week of culture. Both dex and 1,25(OH)2D3 increased ALP activity and mRNA levels independently, and when combined they had an additive or synergistic effect, whereas rhTGF-beta2 antagonized the stimulatory effect of dex on ALP activity. In addition, dex attenuated the increased osteocalcin expression induced by 1,25(OH)2D3. These results show that rhTGF-beta2, dex and 1,25(OH)2D3 have distinct effects and modulate the action of each other on human marrow stromal cell proliferation and differentiation at different time points during the culture.
journal_name
Cytokinejournal_title
Cytokineauthors
Fromigué O,Marie PJ,Lomri Adoi
10.1006/cyto.1997.0209subject
Has Abstractpub_date
1997-08-01 00:00:00pages
613-23issue
8eissn
1043-4666issn
1096-0023pii
S1043-4666(97)90209-Xjournal_volume
9pub_type
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