Control of epidermal differentiation by a retinoid analogue unable to bind to cytosolic retinoic acid-binding proteins (CRABP)

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Abstract

The role played by cytosolic retinoic acid-binding proteins (CRABP) in the control of differentiation and morphogenesis by retinoids remains unclear, which contrasts with the presence of these binding proteins in tissues known to be targets for retinoic acid effects. Human epidermis represents a good system to address this question because 1) the effect of retinoids on keratinocyte differentiation is well documented; 2) epidermis contains CRABP, and the amount of these proteins is modulated both by keratinization and retinoids; 3) the architecture of epidermis obtained in vitro by growing adult human keratinocytes on a dermal substrate can be modulated by retinoids added to the culture medium in a dose-dependent manner; and 4) most markers of epidermal differentiation are also modulated by retinoids in a dose-dependent manner. In this study, we compared, in dose-response experiments, the biologic activities of retinoic acid and CD271, a substance unable to bind to CRABP, but able to bind to nuclear retinoic acid receptors (RAR). Our results show that retinoic acid and CD271 exert similar controls on epidermal morphogenesis and keratinocyte differentiation, as shown by the inhibition of the synthesis of suprabasal keratins, filaggrin, and transglutaminase. Therefore, we exclude a qualitative role for CRABP in the control exerted by retinoids on the differentiation and morphogenesis of cultured human keratinocytes. Instead of being involved in the pathway via which retinoids control epidermal gene expression, CRABP might regulate the amount of intracellular-active retinoic acid and thus control quantitatively the intensity of biologic effects. © 1992.

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APA

Asselineau, D., Cavey, M. T., Shroot, B., & Darmon, M. (1992). Control of epidermal differentiation by a retinoid analogue unable to bind to cytosolic retinoic acid-binding proteins (CRABP). Journal of Investigative Dermatology, 98(2), 128–134. https://doi.org/10.1111/1523-1747.ep12555633

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