Apoptosis and cell cycle effects induced by extracts of the Chinese herbal preparation PC SPES.

Abstract:

:A herbal preparation denoted PC SPES(R) is available in 'natural food' or 'health food' stores in the United States. This mixture (patent pending, US Serial number 08/697,920) consists of extracts from 8 different herbs, 7 originating from China and one from America, and is sold as a dietary supplement. Although several components of this herbal mixture were reported to have antiproliferative and/or antitumor activity little is known about the possible in vitro cytostatic or cytotoxic properties of the formulation. Composition of PC SPES is standardized by HPLC; the ethanol extract is characterized by the presence of 6 distinct components, reproducible from batch to batch. This extract suppressed cell proliferation and reduced the clonogenicity of a variety of human tumor cell lines, including PC-3 and LNCaP prostate carcinomas, MCF-7 and T47-D breast carcinomas, SK-N-MC neuroepithelioma, Cole 38 melanoma, U937 histiomonocytic lymphoma, as well as HL-60 and MOLT-4 leukemias. The sensitivity to PC SPES was different for particular cell lines, with MCF-7 cells being the most sensitive (IC50 = 20 nl/ml) and Cole 38 the most resistant (IC50 = 430 nl/ml) in clonogenicity assays. The predominant cell cycle effect induced by PC SPES was the prolongation of G(1) phase. Apoptosis was observed after exposure of tumor cells to PC SPES for 48 h and longer. PC SPES also downregulated expression of bcl-2, the gene protecting cells against apoptosis (studied in U937 cells) and sensitized these cells to gamma-irradiation. The cell cycle progression of mitogen stimulated human lymphocytes was not affected at PC SPES concentrations which induced cytotoxic and cytostatic effects in tumor cells. The data indicate that PC SPES is cytostatic and cytotoxic for different tumor cell lines and modulates the cell's propensity to undergo apoptosis.

journal_name

Int J Oncol

authors

Halicka H,Ardelt B,Juan G,Mittelman A,Chen S,Traganos F,Darzynkiewicz Z

doi

10.3892/ijo.11.3.437

subject

Has Abstract

pub_date

1997-09-01 00:00:00

pages

437-48

issue

3

eissn

1019-6439

issn

1791-2423

journal_volume

11

pub_type

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