Synthesis of osteoprotegerin and RANKL by megakaryocytes is modulated by oestrogen
| Autor: | S, Bord, E, Frith, D C, Ireland, M A, Scott, J I O, Craig, J E, Compston |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Membrane Glycoproteins
Estradiol Receptor Activator of Nuclear Factor-kappa B RANK Ligand Osteoprotegerin Receptors Cytoplasmic and Nuclear Immunohistochemistry Receptors Tumor Necrosis Factor Gene Expression Regulation Humans RNA Messenger Carrier Proteins Megakaryocytes Cells Cultured Glycoproteins |
| Zdroj: | British journal of haematology. 126(2) |
| ISSN: | 0007-1048 |
| Popis: | To investigate the mechanisms by which megakaryocytes (MKs) may influence bone remodelling, CD34(+) cells were cultured for 6, 9 and 12 d with or without 17beta-oestradiol (E) and immunolocalized for osteoprotegerin (OPG), receptor activator of nuclear factor (NF)-kappaB ligand (RANKL) and CD61. Specific protein expression was measured quantitatively by image analysis. Fluorescence-based immunocytochemistry was used to co-localize OPG and RANKL with CD61. OPG and RANKL mRNA was assessed in CD61(+) cells with or without E at 24 and 48 h. At 6 d, OPG and RANKL expression was unchanged by E treatment. At 9 d, the E-treated cultures with maturing MKs showed a 1.72-fold (P0.01) increase in OPG expression and a 1.8-fold (P0.01) reduction in RANKL. Maximal OPG expression was seen at 12 d with a threefold induction of expression (P0.001), whilst RANKL levels were further suppressed by 2.3-fold compared with controls (P0.001). CD61 co-localized with OPG and RANKL. mRNA data were consistent with that of protein, with a 90-fold induction in OPG expression and a 34-fold suppression of RANKL expression by E (P0.001). Thus, E stimulates megakaryocytopoiesis and modulates OPG and RANKL expression, providing evidence that MKs may play a role in bone remodelling and, in particular, in E-induced changes in osteoclastogenesis and bone resorption. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text