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Titolo:
REGIONALIZATION AND REDISTRIBUTION OF MEMBRANE PHOSPHOLIPIDS AND CHOLESTEROL IN MOUSE SPERMATOZOA DURING IN-VITRO CAPACITATION
Autore:
LIN Y; KAN FWK;
Indirizzi:
QUEENS UNIV,FAC MED,DEPT ANAT & CELL BIOL KINGSTON ON K7L 3N6 CANADA QUEENS UNIV,FAC MED,DEPT ANAT & CELL BIOL KINGSTON ON K7L 3N6 CANADA
Titolo Testata:
Biology of reproduction
fascicolo: 5, volume: 55, anno: 1996,
pagine: 1133 - 1146
SICI:
0006-3363(1996)55:5<1133:RAROMP>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLYENE ANTIBIOTIC FILIPIN; GUINEA-PIG SPERMATOZOA; PLASMA-MEMBRANE; ACROSOME REACTION; INVITRO CAPACITATION; MAMMALIAN SPERM; BOAR SPERM; FERTILIZATION; LOCALIZATION; ORGANIZATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
38
Recensione:
Indirizzi per estratti:
Citazione:
Y. Lin e F.W.K. Kan, "REGIONALIZATION AND REDISTRIBUTION OF MEMBRANE PHOSPHOLIPIDS AND CHOLESTEROL IN MOUSE SPERMATOZOA DURING IN-VITRO CAPACITATION", Biology of reproduction, 55(5), 1996, pp. 1133-1146

Abstract

Fracture-label, surface-replica, and routine freeze-fracture techniques were used in combination with phospholipase A(2)-colloidal gold (PLA(2)-CG) and filipin as probes to study changes in the distribution ofphospholipids and cholesterol, respectively, in morphologically defined plasma membrane domains of mouse spermatozoa during in vitro capacitation. In noncapacitated spermatozoa, quantitative analysis revealed that the fractured plasma membrane overlying the equatorial segment carried the highest PLA(2)-CG labeling density. The next highest labeling densities were found in the anterior acrosome region and the postacrosomal region. On the external surface of the plasma membrane revealedby surface replicas, a uniform distribution of PLA(2)-CG was confinedmainly to the acrosomal region of the head. The plasma membrane of the sperm tail had a relatively low labeling density for PLA(2)-CG. In freeze-fracture replicas of filipin-treated spermatozoa, the labeling density of filipin/sterol complexes (FSCs) was high in the plasma membrane over the acrosomal region where the FSCs were uniformly distributed. The postacrosomal region was weakly labeled. After in vitro capacitation, the densities of PLA(2)-CG and FSCs were significantly reduced in the fractured plasma membrane of the sperm head and the middle piece of the tail. However, surface replicas revealed an increased PLA(2)-CG labeling on the external surface of the plasma membrane covering the postacrosomal region, the middle piece, and the principal piece. Another major change detected in capacitated spermatozoa was the presenceof small aggregates and patches of elevated, membrane-associated particles on the surface-replicated plasma membrane in the upper portion of the postacrosomal domain. Here the PLA(2)-CG labeling density was found to be higher than in noncapacitated spermatozoa. These results provide new information with respect to the reorganization and redistribution of phospholipids in specific regions of the plasma membrane during capacitation and provide further support for the concept that removal or loss of antifusigenic sterol from the sperm plasma membrane constitutes an important step of the capacitation process.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 03:03:06