title: Regulation of the strypsin-related proteinase ISP2 by progesterone in endometrial gland epithelium during implantation in mice.
abstract: Hormones prepare the uterus for the arrival and subsequent invasion of the embryo during pregnancy. Extracellular matrix-degrading proteinases and their inhibitors are involved in this integration process. Recent genetic evidence indicates that there is redundancy within the implantation proteinase cascade, indicating that additional proteinases may be involved. Recently, we described a novel implantation serine proteinase (ISP1) gene that encodes the embryo-derived enzyme strypsin, which is necessary for blastocyst hatching in vitro and the initiation of invasion. The evidence presented in the present study indicates that a second proteinase secreted from the uterus also participates in lysis of the zona pellucida. A second implantation serine proteinase gene (ISP2) was isolated, which encodes a related secreted tryptase expressed specifically within uterine endometrial glands. In pseudopregnancy, ISP2 gene expression is dependent on progesterone priming and is inhibited by the antiprogestin RU486. On the basis of similarities between ISP2 gene expression and that of a progesterone-regulated luminal proteinase associated with lysis of the zona pellucida, it is possible that the strypsin-related protein, ISP2, may encode a zona lysin proteinase.
authors.affiliation: Southern Alberta Cancer Research Centre, Department of Biochemistry and Molecular Biology, University of Calgary, Alberta T2N 4N1, Canada.
authors.forename: C M
authors.initials: CM
authors.lastname: O'Sullivan
authors.forename: S Y
authors.initials: SY
authors.lastname: Liu
authors.forename: S L
authors.initials: SL
authors.lastname: Rancourt
authors.forename: D E
authors.initials: DE
authors.lastname: Rancourt
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D010064:Embryo Implantation; D004622:Embryo, Mammalian / Q000201:enzymology; D004717:Endometrium / Q000201:enzymology*; D004848:Epithelium / Q000201:enzymology; D005260:Female; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects*; D006727:Hormone Antagonists / Q000494:pharmacology; D051379:Mice; D015735:Mifepristone / Q000494:pharmacology; D008969:Molecular Sequence Data; D010052:Ovariectomy; D016133:Polymerase Chain Reaction; D011247:Pregnancy; D011374:Progesterone / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D011555:Pseudopregnancy; D012333:RNA, Messenger / Q000032:analysis; D017422:Sequence Analysis, DNA; D012697:Serine Endopeptidases / Q000737:chemistry / Q000235:genetics*; D015044:Zona Pellucida / Q000201:enzymology
chemical_list: D006727:Hormone Antagonists; D012333:RNA, Messenger; D015735:Mifepristone; D011374:Progesterone; C436409:Prss29 protein, mouse; D012697:Serine Endopeptidases; C048419:strypsin