title: Gene silencing by RNAi in mouse Sertoli cells.
abstract: BACKGROUND
  RNA interference (RNAi) is a valuable tool in the investigation of gene function. The purpose of this study was to examine the availability, target cell types and efficiency of RNAi in the mouse seminiferous epithelium.
  
  
  METHODS
  The experimental model was based on transgenic mice expressing EGFP (enhanced green fluorescent protein). RNAi was induced by in vivo transfection of plasmid vectors encoding for short hairpin RNAs (shRNAs) targeting EGFP. shRNAs were transfected in vivo by microinjection into the seminiferous tubules via the rete testis followed by square wave electroporation. As a transfection reporter, expression of red fluorescent protein (HcRed 1) was used. Cell types, the efficiency of both transfections and RNAi were all evaluated.
  
  
  RESULTS
  Sertoli cells were the main transfected cells. A reduction of about 40% in the level of EGFP protein was detected in cells successfully transfected both in vivo and in vitro. However, the efficiency of in vivo transfection was low.
  
  
  CONCLUSIONS
  In adult seminiferous epithelial cells, in vivo post-transcriptional gene silencing mediated by RNAi via shRNA is efficient in Sertoli cells. Similar levels of RNAi were detected both in vivo and in vitro. This also indicates that Sertoli cells have the necessary silencing machinery to repress the expression of endogenous genes via RNAi.
authors.affiliation: Department of Cell and Developmental Biology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain. emilio76@stanford.edu
authors.forename: Emilio
authors.initials: E
authors.lastname: González-González
authors.forename: Pedro P
authors.initials: PP
authors.lastname: López-Casas
authors.forename: Jesús
authors.initials: J
authors.lastname: Del Mazo
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D018274:Electroporation; D004847:Epithelial Cells / Q000166:cytology / Q000502:physiology; D020868:Gene Silencing; D049452:Green Fluorescent Proteins / Q000235:genetics; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D034622:RNA Interference; D012670:Seminiferous Epithelium / Q000166:cytology / Q000502:physiology*; D012708:Sertoli Cells / Q000166:cytology / Q000502:physiology*; D014162:Transfection
chemical_list: D049452:Green Fluorescent Proteins