title: Species difference exists in the effects of 1alpha,25(OH)(2)D(3) and its analogue 2-methylene-19-nor-(20S)-1,25-dihydroxyvitamin D(3) (2MD) on osteoblastic cells.
abstract: The direct effect of 1alpha,25(OH)(2)D(3) on osteoblasts remains unclear. In this study, we evaluated the in vitro effects of 1alpha,25(OH)(2)D(3) and its analogue, 2-methylene-19-nor-(20S)-1,25-dihydroxyvitamin D(3) (2MD), on osteoblasts from three different species, i.e. bone marrow stromal cells from the Sprague-Dawley (SD) rat, from the C57BL/6 mouse, as well as human osteoblast NHOst cells and human osteosarcoma derived MG-63 cells. We found that in rat cells, both compounds increased cell proliferation, inhibited cell apoptosis and increased alkaline phosphatase (ALP) activity. In mouse cells, however, both compounds initiated cell apoptosis and inhibited ALP activity. In human cells, although cell proliferation was inhibited by both compounds, cell apoptosis was inhibited and ALP activity was enhanced. In each species, 2MD was much more potent than 1alpha,25(OH)(2)D(3). To summarize, species differences should be taken into account in studies of vitamin D effects. However, in all tested species - rat, mouse and human - 2MD is considerably more potent in its effects on osteoblastic cells in vitro than 1alpha,25(OH)(2)D(3).
authors.affiliation: Department for Clinical Science, Intervention and Technology (CLINTEC), Division of Orthopedics, Karolinska Institutet, Huddinge, Sweden. Yan.Li@ki.se
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.forename: Carl-Magnus
authors.initials: CM
authors.lastname: Bäckesjö
authors.forename: Lars-Arne
authors.initials: LA
authors.lastname: Haldosén
authors.forename: Urban
authors.initials: U
authors.lastname: Lindgren
mesh_terms: D000469:Alkaline Phosphatase / Q000378:metabolism; D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D001854:Bone Marrow Cells / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D002117:Calcitriol / Q000031:analogs & derivatives* / Q000494:pharmacology; D002454:Cell Differentiation / Q000502:physiology; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D006801:Humans; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D010006:Osteoblasts / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D013045:Species Specificity; D017154:Stromal Cells / Q000166:cytology / Q000187:drug effects / Q000378:metabolism
chemical_list: C468519:2-methylene-1,25-dihydroxy-19-norvitamin D3; D000469:Alkaline Phosphatase; D002117:Calcitriol