Effect of methanolic extract from silkworm droppings on proliferation and caspase activity in HT-29 human colon cancer cells.

Abstract:

:Colorectal cancer is the third most common cause of cancer-related deaths in the world. Surgical intervention followed by chemotherapy remains the primary approach to treatment since colon cancers remain refractory to most chemotherapeutic agents. Based on that, we established a program to screen natural products for cytotoxic activity, employing the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) reduction assay system utilizing HT-29 human colon cancer cells. During the course of our screening, we found that the methanolic extract of silkworm droppings (SDME) has cytotoxic effects on HT-29 cells. In the present study, we investigated the possible mechanisms by which SDME exerts its antiproliferative activity in HT-29 cells. As expected, SDME inhibited growth of HT-29 cells in a dose-dependent manner as assessed by the MTT reduction assay, the lactate dehydrogenase release assay, and the colony formation assay. We also investigated whether the apoptotic effects induced by SDME involve the caspase pathway using the caspase colorimetric assay. Interestingly, caspase-9 and -3, but not caspase-8, were activated in response to SDME treatment. Taken together, these results clearly indicate that the induction of apoptosis by SDME involves a mitochondrial-mediated pathway and strongly suggest that SDME may potentially be a chemotherapeutic agent for human colon cancer.

journal_name

J Med Food

authors

Hwang JH,Kim JY,Cha MR,Park HR

doi

10.1089/jmf.2006.165

subject

Has Abstract

pub_date

2007-09-01 00:00:00

pages

467-72

issue

3

eissn

1096-620X

issn

1557-7600

journal_volume

10

pub_type

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