[Junction zones of luteal cells in the luteotrophic phase in humans].
Three different types of junctions were revealed studying human corpus luteum during luteotrophic phasis : tight-junctions, gap-junctions and septate junctions. Tight-junctions were characterized by a discontinuous central leaflet formed by osmiophilous punctiform components separated by osmiophobic spaces. Lanthanum nitrate permeability of these junctions lead us to think that they may be leaky. They were only a very few gap-junctions, they were found to be as classically described, made up of seven leaflets. Septate junctions were about 250 A long, some septa were arrayed in a discordely fashion and were separated by lanthanum nitrate permeable spaces. The location of these different junctions was determined with accuracy: tight and gap junctions were located on the lateral faces and around cellular interdigitations, septate junctions were shown to bind either the microvillosities of a same cell or the microvillosities of two bordering cells. The fonctionnal signification of these junctions is discussed. Les auteurs remercient vivement M. le Professeur SOUTOUL et M. le Docteur LANSAC du Service de Gynécologie-Obstétrique (C.H.U. Bretonneau) pour leur aimable collaboration.
D000328:Adult; D003338:Corpus Luteum / Q000648:ultrastructure*; D005260:Female; D006801:Humans; D007365:Intercellular Junctions / Q000648:ultrastructure*; D008184:Luteal Cells / Q000648:ultrastructure
Les zones de jonctions des cellules lutéales en phase lutéotrophique dans l'espèce humaine