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Cell Growth & Differentiation, Vol 7, Issue 4 521-530, Copyright © 1996 by American Association of Cancer Research


ARTICLES

Differential regulation of human ectocervical epithelial cell line proliferation and differentiation by retinoid X receptor- and retinoic acid receptor-specific retinoids

C Agarwal, RA Chandraratna, M Teng, S Nagpal, EA Rorke and RL Eckert
Department of Physiology and Biophysics, Case Western Reserve University School of Medicine, Cleveland, OH 44106-4970, USA.

Retinoids are important regulators of human papillomavirus (HPV)-immortalized cervical epithelial cell differentiation and have been successfully used in the treatment of HPV-involved cervical cancer. In the present study, we examine the effects of a series of natural and synthetic retinoids on differentiation and proliferation of HPV-16-positive lines, ECE16-1 and CaSki. Retinoic acid receptor alpha (RAR alpha), RAR gamma, and retinoid X receptor alpha (RXR alpha) are the major retinoid receptor subtypes expressed when ECE16-1 cells are grown in retinoid-free medium. Our results indicate that ligands that interact with RARs only or both RARs and RXRs, including all-trans-retinoic acid (all-trans-RA), 9-cis-retinoic acid (9-cis-RA), 13-cis-retinoic acid (13-cis-RA), and several synthetic retinoids, suppress ECE16-1 cell proliferation, regulate expression of the retinoid-responsive differentiation marker cytokeratin K5, and increase RAR beta mRNA levels. In contrast, ligands that specifically interact with RXRs do not suppress proliferation and are less efficient regulators of gene expression. CaSki cells express greatly reduced RAR and RXR levels compared to ECE16-1 cells. However, both RAR- and RXR-specific ligands increase CaSki number by > or = 20%. In addition, RXR-specific ligands suppress cytokeratin K5 mRNA levels slightly, compared to RAR-specific ligands that strongly suppress K5 mRNA levels. We also compare the effects of these agents on the proliferation of other cervical cell lines, including ECE16-D2, ME180, and SiHa cells. ECE16-D2 and ME180 cells are growth suppressed by RAR-specific, but not RXR-specific, retinoids. SiHa cells are not responsive to either class of retinoid. Our results indicate that: (a) the response of different human cervical cell lines varies following treatment with receptor type-specific retinoids; and (b) the relationship between retinoid regulation of proliferation and differentiation can be uncoupled.


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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1996 by the American Association of Cancer Research.