Biol Reprod Keystone Symposia Conference on Frontiers in Reproductive Biology & Regulation of Fertility.
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Biology of Reproduction 59, 309-313 (1998)
©Copyright 1998 Society for the Study of Reproduction, Inc.

Prostasome-Like Particles in Stallion Semen1

Giuseppe Arienti2,c, Enrico Carlinic, Attilio M. De Cosmod, Pietro Di Profioe, , and Carlo A. Palmerinif

c Istituto di Biochimica e Chimica Medica, Università di Perugia, 06127 Perugia, Italy d Facoltà di Medicina Veterinaria, Università di Camerino, Matelica - MC, Italy e Dipartimento di Chimica, Università di Perugia, 06123 Perugia, Italy f Dipartimento di Biologia Cellulare e Molecolare, Università di Perugia, 06127 Perugia, Italy

Human semen contains membranous vesicles called prostasomes. They are secreted by the prostate gland and contain large amounts of cholesterol, sphingomyelin, and Ca2+. Prostasomes enhance the motility of ejaculated spermatozoa and are involved in a number of additional biological functions.

No prostasome-like vesicles have been described in horse semen up to now. We have demonstrated the presence of prostasome-like vesicles in the equine semen and characterized them as to size, morphology, and lipid composition; we have found that they are similar to human prostasomes in many respects. We propose that these vesicles might be important for the fecundity of horse semen. This is of interest since the success of artificial insemination is limited by the fact that stallion sperm barely survive cryopreservation.

1 This paper was supported by research grants from The Ministry for University and Scientific Research (MURST, Rome) and the National Research Council (CNR, Rome).

2 Correspondence: Giuseppe Arienti, Istituto di Biochimica e Chimica Medica, Università di Perugia, Via del Giochetto, 06126 Perugia, Italy. FAX: 39.75.5853424; arienti{at}unipg.it




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