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Mol. Cell. Biol., Jun 1997, 3013-3020, Vol 17, No. 6
H Chiba, J Clifford, D Metzger and P Chambon
The F9 murine embryonal carcinoma cell line represents a well- established
system for the study of retinoid signaling in vivo. We have investigated
the functional specificity of different retinoid X receptor (RXR)-retinoic
acid (RA) receptor (RAR) isotype pairs for the control of expression of
endogenous RA-responsive genes, by using wild- type (WT), RXR alpha(-/-),
RAR alpha(-/-), RAR gamma(-/-), RXR alpha(-/- )-RAR alpha(-/-), and RXR
alpha(-/-)-RAR gamma(-/-) F9 cells, as well as panRXR and RAR isotype
(alpha, beta, and gamma)-selective retinoids. We show that in these cells
the control of expression of different sets of RA-responsive genes is
preferentially mediated by distinct RXR-RAR isotype combinations. Our data
support the conclusion that RXR-RAR heterodimers are the functional units
transducing the retinoid signal and indicate in addition that these
heterodimers exert both specific and redundant functions on the expression
of particular sets of RA- responsive genes. We also show that the presence
of a given receptor isotype can hinder the activity of another isotype and
therefore that functional redundancy between retinoid receptor isotypes can
be artifactually generated by gene knockouts.
Copyright © 1997, American Society for Microbiology
Distinct retinoid X receptor-retinoic acid receptor heterodimers are differentially involved in the control of expression of retinoid target genes in F9 embryonal carcinoma cells
Institut de Genetique et de Biologie Moleculaire et Cellulaire, CNRS/INSERM/ULP, College de France, Illkirch, France.
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