title: The expression of Msi-1 and its significance in small intestinal mucosa severely damaged by high-dose 5-FU.
abstract: OBJECTIVE
  The purpose was to investigate the expression of musashi-1 (msi-1) and its significances in small intestinal mucosa that was severely damaged by high-dose 5-FU.
  
  
  METHODS
  A total of 40 adult C57BL/6J mice were divided into two groups: the control group (n = 8, group A) and experimental group (n = 32). The mice in the control group were treated with PBS by intraperitoneal injection, and the other mice were treated with high-dose 5-FU (150 mg/kg body weight for 5 consecutive days) by intraperitoneal injection. At the 1st (group B), 3rd (group C) and 5th (group D) day after treatment with high-dose 5-FU, the dying mice were killed, HE staining and immunohistochemical techniques were used to detect the expression of the putative marker of intestinal epithelial stem cells, msi-1, in samples of the middle intestine from these mice, and the percentage of the msi-1-positive cells from the intestinal mucosal cells of the mice in group B was detected by FACS.
  
  
  RESULTS
  After treatment with high-dose 5-FU, the intestinal mucosa suffered severe damage: the villi and crypts disappeared, the number of msi-1-positive cells increased greatly, the intestinal epithelial cells could be divided into two fractions by FACS, and the percentage of msi-1-positive cells was up to 67.75% in the fraction in which the value of FSC was higher.
  
  
  CONCLUSIONS
  After treatment with high-dose 5-FU, the percentage of intestinal stem cells had increased significantly, which was useful for the further isolation and enrichment of intestinal epithelial stem cells.
authors.affiliation: Department of General Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, China.
authors.forename: Luo
authors.initials: L
authors.lastname: Yuqi
authors.forename: Wu
authors.initials: W
authors.lastname: Chengtang
authors.forename: Wen
authors.initials: W
authors.lastname: Ying
authors.forename: Lei
authors.initials: L
authors.lastname: Shangtong
authors.forename: Liao
authors.initials: L
authors.lastname: Kangxiong
mesh_terms: D000818:Animals; D000964:Antimetabolites, Antineoplastic / Q000633:toxicity*; D004305:Dose-Response Relationship, Drug; D005472:Fluorouracil / Q000633:toxicity*; D007274:Injections, Intraperitoneal; D007413:Intestinal Mucosa / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism*; D051379:Mice; D008810:Mice, Inbred C57BL; D008871:Microvilli / Q000187:drug effects; D009419:Nerve Tissue Proteins / Q000378:metabolism*; D016601:RNA-Binding Proteins / Q000378:metabolism*
chemical_list: D000964:Antimetabolites, Antineoplastic; C104786:Msi1h protein, mouse; D009419:Nerve Tissue Proteins; D016601:RNA-Binding Proteins; D005472:Fluorouracil