title: [Study on the distribution of lactase in the small intestine of SD rats].
abstract: OBJECTIVE
  The article deals with the study on the distribution of lactase and its mRNA in the SD rat intestine.
  
  
  METHODS
  15 of the 3-4 wk old SD rats were selected for this research project. From SD rat duodenum, we scissored the small intestine into 3 segments of each 10 cm length to determine the lactase activities and mRNA levels.
  
  
  RESULTS
  The lactase activities of all 3 part intestines were declined from the duodenum stage by stage (the upper, middle and lower segment was 0.179, 0.160, or 0.151 U/ml homogenate respectively, P < 0.05), but there were no significant difference of mRNA levels happening among the 3 groups.
  
  
  CONCLUSIONS
  The results suggest that the lactase activity mainly distribute over the upper intestine, although there were lactase along whole intestine.
authors.affiliation: Department of Nutrition and Food Hygiene, West China School of Public Health, Sichuan University, Chengdu.
authors.forename: Wei
authors.initials: W
authors.lastname: He
authors.forename: Bin
authors.initials: B
authors.lastname: Lü
authors.forename: Cheng-yu
authors.initials: CY
authors.lastname: Huang
mesh_terms: D000818:Animals; D005260:Female; D007421:Intestine, Small / Q000201:enzymology*; D043322:Lactase / Q000378:metabolism*; D008297:Male; D012333:RNA, Messenger / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D014018:Tissue Distribution
chemical_list: D012333:RNA, Messenger; D043322:Lactase