title: A dominant-negative pleiotrophin mutant introduced by homologous recombination leads to germ-cell apoptosis in male mice.
abstract: Pleiotrophin (PTN) is an 18-kDa heparin-binding secretory growth/differentiation factor for different cell types. Its gene is differentially expressed in both mesenchyme and central nervous system during development and highly expressed in a number of different human tumors. Recently, a PTN mutant was found to act as a dominant-negative effector of PTN signaling. We have now used homologous recombination to introduce the dominant-negative PTN mutant into embryonic stem cells to generate chimeric mice. All highly chimeric male mice with germinal epithelium exclusively derived from embryonic stem cells with the heterologous PTN mutation were sterile. Their testes were uniformly atrophic, and the spermatocytes were strikingly apoptotic at all stages of development. The results support a central role of PTN signaling in normal spermatogenesis and suggest that interruption of PTN signaling may lead to sterility in males.
authors.affiliation: Division of Growth Regulation, Beth Israel Deaconess Medical Center at Harvard Medical School, 41 Avenue Louis Pasteur, Boston, MA 02215, USA.
authors.forename: N
authors.initials: N
authors.lastname: Zhang
authors.forename: H J
authors.initials: HJ
authors.lastname: Yeh
authors.forename: R
authors.initials: R
authors.lastname: Zhong
authors.forename: Y S
authors.initials: YS
authors.lastname: Li
authors.forename: T F
authors.initials: TF
authors.lastname: Deuel
mesh_terms: D000483:Alleles; D000818:Animals; D017209:Apoptosis / Q000235:genetics*; D002352:Carrier Proteins / Q000235:genetics*; D002454:Cell Differentiation / Q000235:genetics; D016207:Cytokines / Q000235:genetics*; D005260:Female; D018507:Gene Expression Regulation, Developmental; D005799:Genes, Dominant; D006133:Growth Substances / Q000235:genetics; D006801:Humans; D008297:Male; D051379:Mice; D009154:Mutation; D009419:Nerve Tissue Proteins / Q000235:genetics; D011995:Recombination, Genetic; D013737:Testis / Q000196:embryology / Q000473:pathology* / Q000502:physiology*
chemical_list: D002352:Carrier Proteins; D016207:Cytokines; D006133:Growth Substances; D009419:Nerve Tissue Proteins; C066845:pleiotrophin