| First Author | Kos O | Year | 2018 |
| Journal | Int Immunopharmacol | Volume | 57 |
| Pages | 112-120 | PubMed ID | 29477972 |
| Mgi Jnum | J:272175 | Mgi Id | MGI:6282607 |
| Doi | 10.1016/j.intimp.2018.02.010 | Citation | Kos O, et al. (2018) Regulation of fetal hemoglobin expression during hematopoietic stem cell development and its importance in bone metabolism and osteoporosis. Int Immunopharmacol 57:112-120 |
| abstractText | We have shown that an altered tissue redox environment in mice lacking either murine beta Hemoglobin major (HgbbetamaKO) or minor (HgbbetamiKO) regulates inflammation. The REDOX environment in marrow stem cell niches also control differentiation pathways. We investigated osteoclastogenesis (OC)/osteoblastogenesis (OB), in bone cultures derived from untreated or FSLE-treated WT, HgbbetamaKO or HgbbetamiKO mice. Marrow mesenchymal cells from 10d pre-cultures were incubated on an osteogenic matrix for 21d prior to analysis of inflammatory cytokine release into culture supernatants, and relative OC:OB using (TRAP:BSP, RANKL:OPG) mRNA expression ratios and TRAP or Von Kossa staining. Cells from WT and HgbbetamaKO mice show decreased IL-1beta,TNFalpha and IL-6 production and enhanced osteoblastogenesis with altered mRNA expression ratios and increased bone nodules (Von Kossa staining) in vitro after in vivo stimulation of mRNA expression of fetal Hgb genes (Hgbepsilon and Hgbbetami) by a fetal liver extract (FSLE). Marrow from HgbbetamiKO showed enhanced cytokine release and preferential enhanced osteoclastogenesis relative to similar cells from WT or HgbbetamaKO mice, with no increased osteoblastogenesis after mouse treatment with FSLE. Pre-treatment of WT or HgbbetamaKO, but not HgbbetamiKO mice, with other molecules (rapamycin; hydroxyurea) which increase expression of fetal Hgb genes also augmented osteoblastogenesis and decreased cytokine production in cells differentiating in vitro. Infusion of rabbit anti- Hgbepsilon or anti- Hgbbetami, but not anti-Hgbalpha or anti- Hgbbetama into WT mice from day 13 gestation for 3weeks led to attenuated osteoblastogenesis in cultured cells. We conclude that increased fetal hemoglobin expression, or use of agents which improve fetal hemoglobin expression, increases osteoblast bone differentiation in association with decreased inflammatory cytokine release. |
