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American Journal of Pathology, Vol 151, 1741-1749, Copyright © 1997 by American Society for Investigative Pathology

REGULAR ARTICLES

Cellular retinol-binding protein-1 is transiently expressed in granulation tissue fibroblasts and differentially expressed in fibroblasts cultured from different organs

G Xu, M Redard, G Gabbiani and P Neuville
Department of Pathology, University of Geneva-CMU, Switzerland.

We have reported that cellular retinol-binding protein-1 (CRBP-1) is transiently expressed by arterial smooth muscle cells during experimental intimal repair (P. Neuville, A. Geinoz, G. Benzonana, M. Redard, F. Gabbiani, P. Ropraz, G. Gabbiani: Am J Pathol 1997, 150:509- 521). We have examined here the expression of CRBP-1 during wound healing after a full-thickness rat skin wound. CRBP-1 was transiently expressed by a significant proportion of fibroblastic cells including myofibroblasts. Expression started 4 days after wounding, reached a maximum at 12 days, and persisted up to 30 days when a scar was formed. After wound closure, most CRBP-1-containing fibroblastic cells underwent apoptosis. We have further investigated CRBP-1 expression in rat fibroblasts cultured from different organs. CRBP-1 was abundant in lung and heart fibroblasts and was detected in decreasing amounts in muscle, tendon, subcutaneous tissue, and granulation tissue fibroblasts. Dermis fibroblasts contained no detectable levels of CRBP- 1. All-trans retinoic acid and transforming growth factor-beta1 inhibited cell proliferation and increased CRBP-1 expression in fibroblastic populations except dermis fibroblasts. We demonstrate that during granulation tissue formation a subpopulation of fibroblastic cells express CRBP-1 de novo. We also demonstrate that CRBP-1 expression by fibroblasts is regulated in vitro by retinoic acid and transforming growth factor-beta1. Our results suggest that CRBP-1 and possibly retinoic acid play a role in the evolution of granulation tissue.

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