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Biomedical subjects

F Rosati

Publications and source records attributed to F Rosati.

77 records · Page 5Linked to original sources
PubMedDate not supplied

Further observations on the morphogenesis of the round headed human spermatozoa.

Sperm and testicular biopsies of an infertile human patient have been investigated using histochemical and electron microscopical technique. Spermiogram revealed a head defect, characterized with lacking acrosome and round and immature nucleoplasm, occuring in practically all cells and coiled tails in about a half of spermatozoa. EM study of spermatids has shown an abortive development of acrosome, whose primordium failed to attach the nucleus and expand, instead regressed. The nucleus failed in shaping and retarded in maturing, a disturbance apparently associated with the aplasia of hypoplasia of caudal manchette. The role of zinc in nuclear differentiation and the shape of head in the movement pattern are discussed.

Acrosome↗
PubMedDate not supplied

Sialyglycoconjugates release during in vitro capacitation of human spermatozoa.

Modifications of the human sperm surface during incubation in capacitating conditions were studied by radiolabeling terminal sialic acid residues of cell surface glycoconjugates using the sodium metaperiodate/sodium tritiated borohydride method. During in vitro capacitation, sialyglycoconjugates were released from the human sperm surface according to well reproducible kinetics. This release could be inhibited by the presence of seminal plasma in the capacitation buffer. Two principal size classes of sialyglycoconjugates were detected in the capacitation medium and analyzed by gel filtration chromatography and SDS-PAGE. The smaller class was characterized by glycopeptides less than 5,000 Da, whereas the larger class was characterized by two sialyglycoproteins of approximately 15,000-16,000 and 22,000-23,000 Mr. The role of human albumin, a key component of the capacitation buffer, in the removal of these molecules from the sperm surface was studied in light of its constant association with large amounts of released material.

Adult↗