Estrogen Potentiates the Combined Effects of Transforming Growth Factor- beta and Tumor Necrosis Factor- alpha on Adult Human Osteoblast-like Cell Prostaglandin E sub(2) Biosynthesis

• Published in: Calcified tissue international Vol. 73; no. 6; pp. 565 - 574
• Main Authors: Secreto, F J, Grover, A, Pacurari, M, Rice, M B, Kantorow, M, Bidwai, A P, Blaha, J D, Keeting, P E
• Format: Journal Article
• Language: English
• Published: 01-12-2003
• ISSN: 0171-967X; 1432-0827
• DOI: 10.1007/s00223-002-0023-z

Reports that estrogen treatment modulates arachidonic acid metabolism by bone and bone cells are found in the literature. However, conflicting indications of the relationship that exists between estrogen and arachidonic acid metabolism emerge from the analysis of those reports. The present studies were undertaken to determine if estrogen effected the production of prostaglandins (PG) in human osteoblast-like (hOB) cell cultures derived from adults, under basal or cytokine-stimulated conditions. A 48-hour estrogen pretreatment did not modify hOB cell PG biosynthesis on a qualitative basis, and PGE sub(2) formation predominated under all tested conditions. Estrogen pretreatment did lead to increased PGE sub(2) production in specimens stimulated conjointly with transforming growth factor- beta sub(1) and tumor necrosis factor- alpha (p < 0.001). No changes in PGE sub(2) production were observed in estrogen pretreated specimens stimulated singly with either tested cytokine, nor in samples in which either TGF beta or TNF was replaced by interleukin-1 beta . Anti-estrogen (ICI 164,384) inclusion prevented the estrogen-dependent increase in PGE sub(2) production in the TGF beta plus TNF-stimulated samples. These results suggest that an estrogen effect on bone cell prostaglandin biosynthesis may be most evident and significant under conditions in which the cells are exposed to multiple osteotropic cytokines, a condition that applies during the bone remodeling process.