Modulation of the rabbit chondrocyte phenotype by retinoic acid terminates type II collagen synthesis without inducing type I collagen: the modulated phenotype differs from that produced by subculture

Developmental Biology
P D Benya, S R Padilla

Abstract

The differentiated phenotype of rabbit articular chondrocytes can be characterized by the synthesis of high levels of cartilage specific proteoglycan and collagen (type II). Treatment of these cells in primary monolayer culture for periods of up to 18 days with 0.03 to 3.0 micrograms/ml retinoic acid (RA) resulted in suppression of colony formation, altered morphology, and decreased (eightfold) proteoglycan and collagen synthesis. With the exception of collagen synthesis, these changes were complete with all doses after 4 days of treatment. Collagen synthesis declined more slowly; it was dose dependent after 4 days and maximally inhibited by all doses by 9 days. Detailed analysis of the collagen phenotype was performed using SDS-PAGE of intact chains and 2-D CNBr peptide analysis. RA caused cessation of type II synthesis, and transient stimulation of type III and type I trimer collagen synthesis, without induction of type I collagen. Essentially identical results were obtained with retinol. The resultant collagen phenotype differed significantly from the type I-containing phenotype induced by subculture. Thus, suppression of this differentiated program did not elicit a common modulated phenotype. The results are discussed in th...Continue Reading

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