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Carcinogenesis, Vol. 20, No. 6, 1133-1135, June 1999
© 1999 Oxford University Press

Short Communication

Retinoic acid and 4-hydroxyphenylretinamide induce growth inhibition and tissue transglutaminase through different signal transduction pathways in mouse fibroblasts (NIH 3T3 cells)

Valeria Giandomenico, Fausto Andreola, Maria Luisa Rodriguez de la Concepcion, Steven J. Collins1 and Luigi M. De Luca2

Laboratory of Cellular Carcinogenesis and Tumor Promotion, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892-4255 and
1 Fred Hutchinson Cancer Research Center, Seattle, WA 98104, USA

4-Hydroxyphenylretinamide (4-HPR) is a synthetic retinoid with minimal toxicity and favorable pharmacokinetics during long-term administration to patients in clinical trials. Since 4-HPR binds poorly to the retinoic acid receptors, the issue of whether 4-HPR exerts its biological actions via classical retinoid receptor pathways remains to be resolved. We have previously reported that stable expression of a truncated retinoic acid receptor {alpha}, RAR{alpha}403, transduced in NIH 3T3 cells by a retroviral vector, rendered the cells resistant to retinoic acid for growth inhibition and induction of tissue transglutaminase (TGase II). Here, we report that stable expression of the dominant negative construct RAR{alpha}403 fails to blunt growth inhibition and TGase II induction by 4-HPR, a potent chemopreventive retinoid, in the same cells. These data show that retinoic acid receptors do not mediate either growth inhibition or induction of TGase II activity by 4-HPR in mouse fibroblast cells.

Abbreviations: 4-HPR, 4-hydroxyphenylretinamide; RA, all-trans-retinoic acid; RAR, retinoic acid receptor; TGase II, tissue transglutaminase.

2 To whom correspondence should be addressed at: Building 37 Room 3A/17, 37 Convent Drive, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892-4255, USA Email: luigi_de_luca{at}nih.gov


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