Osteogenic activity of constituents from Butea monosperma

Phytochemical investigation from the stem bark of Butea monosperma, led to the isolation and identification of three new compounds named buteaspermin A (1), buteaspermin B (2) and buteaspermanol (3), along with 19 known compounds. The structure of compounds 1–22 were established on the basis of their spectroscopic data. The isolated compounds 2–17 were evaluated using neonatal (1–3 day old) rat calvaria derived primary osteoblast cultures. Five of these compounds 7, 10–13 showed promising osteogenic activity, attributed to increased osteoblast proliferation, differentiation and mineralization as evidenced by marked increase in expression of alkaline phosphatase, an early phase differentiation marker, and alizarin Red S staining of osteoblasts cultured for 48 h and von Kossa silver staining of nodules formed 15 days after culture with these compounds. Quantification of mineralization by optical density measurement of Alizarin Red S extracted from stained osteoblasts cultured for 7 days in presence of these compounds showed significant (P < 0.05, vs corresponding vehicle control group) increase in mineralization. On the basis of biological results, structure–activity relationships are discussed.

Graphical abstractThree new compounds named buteaspermin A (1), buteaspermin B (2) and buteaspermanol (3), along with 19 known compounds were isolated from the stem bark of Butea monosperma. Five of these compounds 7, 10–13 showed promising osteogenic activity.Figure optionsDownload full-size imageDownload as PowerPoint slide