Distribution and Dietary Induction of Cellular Retinol-Binding Protein Type II along the Villus-Crypt Axis of the Rat Jejunum

Yuko OGURA, Hiromitsu YASUTAKE, Kazuki MOCHIZUKI, Saori YOSHIKAWA, Kazuhito SURUGA, Hiroshi SUGIYAMA, Sachiko TAKASE, Toshinao GODA
2008 Journal of Nutritional Science and Vitaminology  
Cellular retinol-binding protein type II (CRBPII) is exclusively expressed in the small intestinal absorptive cells. We previously reported that dietary fat induces CRBPII expression within 12 h of fat intake. To examine at which locus of the villus-crypt axis this response to dietary fat occurs, 6-wk-old rats were fed a low-fat diet (7% energy) for 7 d, and then given free access to a high-fat diet (70% energy) for the subsequent 12, 24 or 48 h. Cryostat sectioning of jejunal segments followed
more » ... l segments followed by RNA blot hybridization of the transcripts revealed that CRBPII mRNA was expressed maximally in the lower villus, and the immunoreactive protein of CRBPII was expressed maximally in the mid-villus. Feeding the highfat diet caused a pronounced increase in CRBPII mRNA level from the lower-to middle-villus within 12 h. These results suggest that the CRBPII gene is maximally expressed in the lower villus, and that dietary fat causes an enhancement of CRBPII gene expression in the villus cells.
doi:10.3177/jnsv.54.130 fatcat:cwqkjwydhzhbznx7gt5lxdroca