Kuo, Soong-Yu IUFRO Division 5 Conference 5.07B Using Plantation And Small- Diameter Timber In Composites.

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Kuo, Soong-Yu IUFRO Division 5 Conference 5.07B Using Plantation And Small- Diameter Timber In Composites

Chemical and Cytotoxic Constituents from the Leaves of Cinnamomum subavenium 1 Basic Medical Science Education Center, Fooyin University; Kaohsiung County 83101, Taiwan (R.O.C.); 2 Department of Forest Products Science, National Chia-Yi university, Chiayi, Taiwan (R.O.C.) Soong-Yu Kuo 1, Wen-Li Lo 1, Chung-Yi Chen 1, Jin-Cherng Huang 2 and Hsien-Toung Huang 2

Motive : The chemical constituents and the biological activity of the leaves of Cinnamomum subavenium Miq. (Lauraceae) have not yet been reported. Purpose : To elucidate the cytotoxic mechanism of subamolides (1 and 2), the capacity of subamolide D (1) and subamolide E (2) to inhibit cell cycle phase distribution. Method : Propidium iodide staining and cytometry analysis were used to evaluate the cell cycle progression of the treated SW480 cells. Aim of Work And Methods

Results The marked increase in sub-G1 apoptotic fraction appeared in cells treated with μM subamolide D (1) or subamolide E (2) in a concentration-dependent manner. Additionally, incubation with 25, 50 and 75 μM subamolide D (1) for 24 h resulted in the accumulation of cells in G2/M phase (25.4, 29.8 and 23.0 %, respectively) compared with that in control (15.4 %). When cells were treated with 100 μM subamolide D (1) or subamolide E (2), > 25 %, > 78 %, and > 85 % sub-G1 fraction was noted for treated cells after 8 h, 16 h, and 24 h exposure, respectively.

Conclusion Subamolides D (1) and E (2) caused DNA damage in a dose- and time-dependent manners. These findings suggest that compounds present in C. subavenium Miq. (e.g. subamolides D (1) and E (2)) may have chemopreventive properties. This study is the first to investigate the effect of subamolides D (1) and E (2) on cell cycle phase distribution in human colorectal cancer cells.