Oridonin induces apoptosis via PI3K/Akt pathway in cervical carcinoma HeLa cell line
Aim: To investigate the apoptosis-inducing effect of oridonin, a diterpenoid isolated from Rabdosia rubescens, in the human cervical carcinoma HeLa cell line. Methods: A morphological analysis, nuclear condensation, and fragmentation of chromatin were monitored using Hoechst 33342 staining. Cell via...
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Published in | Acta pharmacologica Sinica Vol. 28; no. 11; pp. 1819 - 1826 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
Nature Publishing Group
01.11.2007
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Subjects | |
Online Access | Get full text |
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Summary: | Aim: To investigate the apoptosis-inducing effect of oridonin, a diterpenoid isolated from Rabdosia rubescens, in the human cervical carcinoma HeLa cell line. Methods: A morphological analysis, nuclear condensation, and fragmentation of chromatin were monitored using Hoechst 33342 staining. Cell viability was assessed using the 3-(4, 5-dimethylthiazol-(2)-yl)-2, 5-diphenyl tetrazolium bromide (MTT) assay. Cell apoptosis and the apoptosis-related activation in the HeLa cell line were evaluated by flow cytometry and Western blotting. Results: Oridonin suppressed the proliferation of the HeLa cell line in a dose- and time-dependent fashion. Oridonin treatment downregulated the activation of protein kinase B (Akt), the expression of forkhead box class O (FOXO) transcription factor, and glycogen synthase kinase 3 (GSK3). Oridonin also induced the release of cytochrome c accompanied by the activation of caspase-3 and poly-adenosine diphosphate-ribose polymerase cleavage. In addition, Z-D(OMe)-E(OMe)-V-D(OMe)- FMK (z-DEVD-fmk), an inhibitor of caspases, prevented caspase-3 activation and abrogated oridonin-induced cell death. Finally, oridonin treatment of the HeLa cell line downregulated the expression of the inhibitor of the apoptosis protein. Conclusion: Our results showed that oridonin-induced apoptosis involved several molecular pathways. Oridonin may suppress constitutively activated targets of phosphatidylinositol 3-kinase (Akt, FOXO, and GSK3) in the HeLa cell line, inhibiting the proliferation and induction of caspase-dependent apoptosis. |
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Bibliography: | R737.33 cervical carcinoma; oridonin; apoptosis; Akt cervical carcinoma oridonin apoptosis Akt 31-1347/R ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1671-4083 1745-7254 |
DOI: | 10.1111/j.1745-7254.2007.00667.x |