Effects of Placental Extract on Cell Proliferation, Type I Collagen Production, and ALP Secretion in Human Osteosarcoma Cell Line Saos-2

Abstract

Porcine placenta extract (P-placenta) is widely applied in medicine and cosmetics. However, few studies have examined the effect of the extract on the cellular behavior of the osteoblastic cell line Saos-2. Here, we demonstrated that P-placenta enhances the proliferation, collagen type I production, and alkaline phosphatase (ALP) secretion of Saos-2 in vitro. Proliferation of Saos-2 was assessed by MTT and DNA synthesis assays. Type I collagen production and ALP secretion were evaluated using enzyme-linked immunosorbent assay and ALP assays. The cells were treated with/without 20, 200 and 2000 μg/ml of P-placenta for 24 h. We found that 200 μg/ml P-placenta significantly induced the proliferation of Saos-2 and enhanced type I collagen production and ALP secretion. The results indicate that P-placenta controls the cellular behavior of osteoblasts, resulting in the secretion of early bone-related biomarkers.