Identification and localization of plasminogen activator inhibitor-1 within the porcine oviduct.
Biol Reprod
; 62(3): 501-10, 2000 Mar.
Article
en En
| MEDLINE
| ID: mdl-10684789
ABSTRACT
The porcine oviduct synthesizes de novo and secretes a number of proteins into culture medium, many of which are unidentified. The objectives of the present study were to 1) semipurify and identify a M(r) 45 000 secreted protein of the oviduct, 2) examine its synthesis within the three functional segments (infundibulum, ampulla, and isthmus), and 3) evaluate its distribution throughout the oviduct. Oviductal tissue was collected during early pregnancy, divided into functional segments, and subsequently cultured. Medium was collected, and the M(r) 45 000 protein was concentrated by gel-filtration chromatography. The semipurified protein was transferred onto a polyvinylidene fluoride membrane and subjected to N-terminal amino acid analysis. The 26-amino acid sequence was 96% identical to that of pig plasminogen activator inhibitor (PAI)-1. Analysis by 1-dimensional SDS-PAGE and fluorography of rabbit anti-human PAI-1-immunoprecipitated product confirmed PAI-1. Subsequent 2-dimensional SDS-PAGE and fluorographic analyses of media revealed greater PAI-1 synthesis by the isthmus than by the ampulla or infundibulum. PAI-1 was immunolocalized throughout the oviduct and was heavily concentrated in the apical region of epithelial cells. Immunogold electron microscopy localized PAI-1 within putative secretory granules in the epithelial apical region and also associated with cilia in the isthmus. Isthmic PAI expression suggests a crucial role in protecting the preimplantation embryo from proteolytic degradation as well as in regulation of extracellular matrix turnover and remodeling.
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Base de datos:
MEDLINE
Asunto principal:
Inhibidor 1 de Activador Plasminogénico
/
Trompas Uterinas
Tipo de estudio:
Diagnostic_studies
Idioma:
En
Revista:
Biol Reprod
Año:
2000
Tipo del documento:
Article