Abstract

We reported in 1981 that prostaglandin D2 (PGD2) selectively inhibits tumor cell growth (1). It was verified by Dr. Fukushima’s group in 1985 (2) that a metabolite of PGD2, Δ12-PGJ2 (9-deoxy-Δ9,12-13,14- dihydro-PGD2) was the active form of this PG. Recently we have found that PGD2 and PGA1 derivatives (3,4), which are called the anti-tumor PGs, facilitate mineralization in human osteoblasts. Considering that carcinogenesis enhances bone resorption in general, the concept that anti-tumor PGs stimulate mineralization is an attractive one. I will present data on the stimulative effect of these cyclopentenone PGs and their derivatives on mineralization in human osteoblasts, and discuss a possible mechanism.

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