HIV and germinal cells: how close an association?

HIV-1 chemokine co-receptor CCR5 is expressed on the surface of human spermatozoa

Viruses adhering to the sperm surface are described in the semen of HIV-1-infected individuals, although viral adhesion mechanisms have yet to be fully understood. We demonstrate, by cytometric analysis and immunofluorescence microscopy, the presence of beta-chemokine receptor 5 (CCR5) on the periacrosomal region of ejaculated spermatozoa. CCR5 expressed on the sperm cell surface may allow sperm to act as virion cellular carriers during the sexual transmission of HIV-1 infection.

HIV and gamete interactions

With the development of combination therapies and their use for the treatment of the human immunodeficiency virus (HIV), the health and life expectancy of HIV-positive patients has improved significantly. As a result, HIV-discordant couples are looking to a future that involves starting a family. However, the potential risks of exposing HIV-infected sperm to oocytes are still being assessed. This article outlines the clinical detection of HIV in semen samples, the relationships between HIV and semen parameters, and HIV-sperm and oocyte interactions. It also considers the implications of introducing exogenous genetic material into an oocyte via intracytoplasmic sperm injection (ICSI) and the possible implications of this for assisted reproduction.

Viruses in the mammalian male genital tract and their effects on the reproductive system

This review describes the various viruses identified in the semen and reproductive tracts of mammals (including humans), their distribution in tissues and fluids, their possible cell targets, and the functional consequences of their infectivity on the reproductive and endocrine systems. The consequences of these viral infections on the reproductive tract and semen can be extremely serious in terms of organ integrity, development of pathological and cancerous processes, and transmission of diseases. Furthermore, of essential importance is the fact that viral infection of the testicular cells may result not only in changes in testicular function, a serious risk for the fertility and general health of the individual (such as a fall in testosteronemia leading to cachexia), but also in the possible transmission of virus-induced mutations to subsequent generations. In addition to providing an exhaustive account of the data available in these domains, this review focuses attention on the fact that the interface between endocrinology and virology has so far been poorly explored, particularly when major health, social and economical problems are posed. Our conclusions highlight the research strategies that need to be developed. Progress in all these domains is essential for the development of new treatment strategies to eradicate viruses and to correct the virus-induced dysfunction of the endocrine system.