Document Detail

Apoptotic mechanism of paclitaxel-induced cell death in human head and neck tumor cell lines.
MedLine Citation:
PMID:  19200178     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Paclitaxel (taxol) is clinically used to treat various human tumors. However, the cellular and molecular mechanism regarding apoptotic effect of paclitaxel on head and neck squamous cell carcinoma (HNSCC) remains elusive. METHODS: The apoptotic effect and the mechanism of paclitaxel on FaDu hypopharyngeal cancer cell line, OEC-M1 gingival cancer cell line, and OC3 betel quid chewing-related buccal cancer cell lines were investigated by morphological observations, cell viability assay, flow cytometry assay and Western blotting methods. RESULTS: Rounded-up cell number increased with membrane blebbing as the treatment of paclitaxel (50-500 nM) increased from 24 to 48 h among these cell lines. In cell viability assay, cell surviving rate significantly decreased from 87 to 27% as the dosage and duration of paclitaxel treatment increased (P < 0.05). Flow-cytometry analysis further demonstrated that 50 nM paclitaxel induced G2/M phase cell arrest among these cell lines within 8 h treatment, and then G2/M phase cell fraction significantly decreased as subG1 phase cell fraction significantly increased after 24 h treatment (P < 0.05), suggesting that cells underwent apoptosis. Furthermore, the activated caspases-8, -9, -3, -6 and poly ADP-ribose polymerase cleavage could all be significantly detected in FaDu, OEC-M1 and OC3 cells (P < 0.05). CONCLUSION: Paclitaxel activated cell cycle arrest and caspase protein expressions to induce apoptosis in HNSCC cell lines.
J-R Hsiao; S-F Leu; B-M Huang
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of oral pathology & medicine : official publication of the International Association of Oral Pathologists and the American Academy of Oral Pathology     Volume:  38     ISSN:  1600-0714     ISO Abbreviation:  J. Oral Pathol. Med.     Publication Date:  2009 Feb 
Date Detail:
Created Date:  2009-02-09     Completed Date:  2009-05-27     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8911934     Medline TA:  J Oral Pathol Med     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  188-97     Citation Subset:  D; IM    
Department of Otolaryngology, College of Medicine, National Cheng Kung University, Tainan, Taiwan.
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MeSH Terms
Antineoplastic Agents, Phytogenic / pharmacology*,  therapeutic use
Blotting, Western
Carcinoma, Squamous Cell / drug therapy
Caspases / metabolism*
Cell Cycle / drug effects*
Cell Line, Tumor / drug effects
Cell Survival / drug effects
Dose-Response Relationship, Drug
Enzyme Activation
Flow Cytometry
Head and Neck Neoplasms / drug therapy
Paclitaxel / pharmacology*,  therapeutic use
Poly(ADP-ribose) Polymerases / metabolism
Reg. No./Substance:
0/Antineoplastic Agents, Phytogenic; 33069-62-4/Paclitaxel; EC Polymerases; EC 3.4.22.-/Caspases

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