Bovine CRABP-I transcripts were undetectable in undifferentiated intramuscular fibroblast-like cells, but were markedly induced during differentiation.
The level of CRABP-I transcripts increased by more than two-fold after RA treatment at low or high concentrations (Figure 5C); however, the expression of CRABP-II mRNA decreased by more than four-fold compared with cultures lacking RA (Figure 5D).
The primary structure of bovine CRABP-II was similar to that of the bovine CRABP-I; approximately 75% of the amino acids were identical.
Moreover, we cloned CRABP-II in sirloin tissue and CRABP-I in adipose tissue, so perhaps CRABP-I is involved in the regulation of bovine adipogenesis.