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Effects of prostaglandins E1 and E2 on the growth and differentiation of osteoblast-like cells cultured in vitro

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Prostaglandins E (PGEs) are abundantly produced in the skeletal tissue, the turnover of which they can modulate acting on both bone deposition and resorption. We compared the effects of PGE1 and PGE2 on the growth and differentiation of rat bone-marrow osteoblast-like cells cultured in vitro. Both PGEs stimulated cultured cell growth, PGE2 being more effective than PGE1. PGE1 inhibited and PGE2 enhanced alkaline phosphatase activity. Both PGEs markedly raised osteocalcin synthesis, without apparently affecting collagenase-digestible protein production. Scanning electron microscopy showed that untreated cultured osteoblast-like cells were arranged in clusters and displayed a polygonal shape. PGE1 did not alter cell morphology, while PGE2 provoked elongation of cultured cells and sprouting of slend cytoplasmic processes. Morphometric analysis indicated that PGE1 decreased and PGE2 increased cultured-cell dimensions. Collectively, these findings allow us to conclude that PGE1 and PGE2, although being both able to enhance proliferation of osteoblast-like cells cultured in vitro, exert divergent effects on their differentiation. PGE1 seems to slow-down osteoblast maturation, while PGE2 appears to stimulate osteoblast differentiation to mature osteocytes.
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Document Type: Research Article

Affiliations: Department of Pharmaceutical Sciences, University of Padua, I-35121 Padua, Italy

Publication date: January 1, 2002

More about this publication?
  • The International Journal of Molecular Medicine is a monthly, peer-reviewed journal devoted to the publication of high quality studies related to the molecular mechanisms of human disease. The journal welcomes research on all aspects of molecular and clinical research, ranging from biochemistry to immunology, pathology, genetics, human genomics, microbiology, molecular pathogenesis, molecular cardiology, molecular surgery and molecular psychology.

    The International Journal of Molecular Medicine aims to provide an insight for researchers within the community in regard to developing molecular tools and identifying molecular targets for the diagnosis and treatment of a diverse number of human diseases.
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