title: Identifying putative contraceptive targets by dissecting signal transduction networks in the epididymis using an in vivo electroporation (electrotransfer) approach.
abstract: Our studies have focused on understanding how the initial segment is regulated, in particular, by testicular luminal fluid factor(s). Our working hypothesis is that testicular luminal fluid growth factors, e.g. FGFs, regulate initial segment function via activation of signal transduction pathways and PEA3 family transcription factors. These, in turn, regulate downstream genes that are important for providing an appropriate fluid milieu for the protection and survival of sperm and the initial segment. To test this hypothesis and to look for potential contraceptive targets, we used an in vivo electroporation technique to introduce dominant-negative plasmids of FGF Receptor 1 and ERM into the initial segment of the rat epididymis. The levels of several putative downstream genes were estimated using quantitative-PCR (q-PCR). Data suggests that initial segment genes are regulated by 5alpha-reductase-dependent and -independent pathways and that multiple growth factor pathways are activated to coordinate the expression of these genes.
authors.affiliation: Department of Cell Biology, University of Virginia Health System, Charlottesville, VA 22908, USA.
authors.forename: Sallie A
authors.initials: SA
authors.lastname: Fox
authors.forename: Ling
authors.initials: L
authors.lastname: Yang
authors.forename: Barry T
authors.initials: BT
authors.lastname: Hinton
mesh_terms: D000818:Animals; D042944:Cholestenone 5 alpha-Reductase / Q000235:genetics / Q000378:metabolism; D003272:Contraceptive Agents, Male / Q000494:pharmacology; D004268:DNA-Binding Proteins / Q000235:genetics*; D018274:Electroporation; D004822:Epididymis / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism*; D005306:Fertilization / Q000187:drug effects / Q000235:genetics*; D005786:Gene Expression Regulation / Q000187:drug effects; D018014:Gene Transfer Techniques; D008297:Male; D009154:Mutation; D010957:Plasmids / Q000235:genetics; D051381:Rats; D051496:Receptor, Fibroblast Growth Factor, Type 1 / Q000235:genetics*; D015398:Signal Transduction; D014157:Transcription Factors / Q000235:genetics*
chemical_list: D003272:Contraceptive Agents, Male; D004268:DNA-Binding Proteins; C513243:Etv5 protein, rat; D014157:Transcription Factors; D042944:Cholestenone 5 alpha-Reductase; D051496:Receptor, Fibroblast Growth Factor, Type 1