Park C, Kim GY, Kim WI, Hong SH, Park DI, Kim ND, Bae SJ, Jung JH, Choi YH. Induction of Apoptosis by
(Z)-Stellettic Acid C, an Acetylenic Acid from the Sponge
Stelletta sp., Is Associated with Inhibition of Telomerase Activity in Human Leukemic U937 Cells.
Chemotherapy 2007;
53:160-8. [PMID:
17356266 DOI:
10.1159/000100809]
[Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2006] [Accepted: 06/13/2006] [Indexed: 01/04/2023]
Abstract
BACKGROUND
(Z)-stellettic acid C, an acetylenic acid from the marine sponge Stelletta sp., has been shown to have cytotoxic activity in some cancer cells; however, its mechanisms on malignant cell growth are not known. In this study, the potential of (Z)-stellettic acid C to induce apoptosis in human leukemic U937 cells and its effects on telomerase activity were investigated.
METHODS
Cytotoxicity was evaluated by MTT assays. Apoptosis was detected using DAPI staining and annexin V fluorescein. The mRNAs of Bcl-2, inhibitor of apoptosis proteins (IAPs) family and Fas/FasL system were determined by RT-PCR. Caspases and telomerase activities were measured using colorimetric assay and telomeric repeat amplification protocol enzyme-linked immunosorbent assay (TRAP-ELISA), respectively.
RESULTS
Exposure of U937 cells to (Z)-stellettic acid C resulted in growth inhibition and induction of apoptosis in a dose-dependent manner, which was associated with the modulation of Bcl-2 family expression, activation of caspases and downregulation of IAPs family members. (Z)-Stellettic acid C treatment markedly inhibited the activity of telomerase in a dose-dependent fashion. Additionally, the expression of human telomerase reverse transcriptase, a main determinant of the telomerase enzymatic activity, was progressively downregulated by (Z)-stellettic acid C treatment.
CONCLUSIONS
These results suggest that (Z)-stellettic acid C could have a possible cancer therapeutic potential.
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