Abstract:
:Osteoblastic cells have been shown to be involved in osteoclast formation through cell to cell contacts. This study was designed to examine the possible function of vascular cell adhesion molecule 1 (VCAM-1) during osteoclastogenesis. As a source for stromal cells we used the recently established mouse bone marrow stromal cell line mBMS-B1 which has the ability to support osteoclastogenesis when used in co-culture with a crude spleen cell suspension. mBMS-B1 cells express a single approximately 3.9 kb VCAM-1 mRNA species. Expression was low under basal culture conditions and a 5-10-fold increase was observed in the presence of 1,25(OH)2D3. Cell surface expression of VCAM-1 examined by FACS analysis was increased about 2-fold after 1,25(OH)2D3 treatment. Immunoprecipitation of cell surface expressed VCAM-1 or total VCAM-1 protein using the anti-VCAM-1 monoclonal antibody MK2.7 resulted in a single approximately 110 kDa protein on SDS-PAGE. Induction by 1,25(OH)2D3 was about 2-5-fold on day 3. The stromal cell-osteoclast precursor cell interaction was investigated in a co-culture of the mBMS-B1 and mouse spleen cells in the presence of 1,25(OH)2D3. The monoclonal antibody MK2.7 which is known to block hemopoietic-stromal cell recognition inhibited the formation of osteoclasts when added to the co-culture at day 2 but not day 4. These data suggest that VCAM-1 is involved in the interaction between stromal cells and osteoclastic precursor cells during osteoclastogenesis presumably most important during early stages of the formation of osteoclasts.
journal_name
FEBS Lettjournal_title
FEBS lettersauthors
Feuerbach D,Feyen JHdoi
10.1016/s0014-5793(96)01495-0subject
Has Abstractpub_date
1997-01-27 00:00:00pages
21-4issue
1eissn
0014-5793issn
1873-3468pii
S0014-5793(96)01495-0journal_volume
402pub_type
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