Susana Theas1, Claudia Rival, Livia Lustig. 1. Centro de Investigaciones en Reproducción, Facultad de Medicina, Universidad de Buenos Aires, Bs. As., Argentina. ciruba@fmed.uba.ar
Abstract
PROBLEM: The aim of this study was to determine the mechanism of germ cell death in experimental autoimmune orchitis (EAO) and the involvement of the Fas-FasL system in this process. METHOD OF STUDY: The EAO was induced in rats by immunization with testis homogenate and adjuvants. Apoptosis was studied by light microscopy, in situ end labeling of apoptotic DNA and DNA fragmentation techniques. Fas, FasL and caspase 3 expression was detected by immunohistochemistry. RESULTS: In rats with orchitis the number of Fas+ and FasL+ apoptotic germ cells increased from day 50, when the lesion develops, to 150 days, and correlates with the degree of testicular damage. Most spermatocytes expressing Fas were apoptotic. Many Fas+ germ cells were also immunoreactive for FasL. Moreover, these cells also expressed caspase 3. CONCLUSIONS: In rats with EAO germ cell death occurs through an apoptotic mechanism preceding germ cell sloughing. Immunohistochemical data suggest that the Fas-FasL system mediates germ cell apoptosis in an autocrine and/or paracrine way.
PROBLEM: The aim of this study was to determine the mechanism of germ cell death in experimental autoimmune orchitis (EAO) and the involvement of the Fas-FasL system in this process. METHOD OF STUDY: The EAO was induced in rats by immunization with testis homogenate and adjuvants. Apoptosis was studied by light microscopy, in situ end labeling of apoptotic DNA and DNA fragmentation techniques. Fas, FasL and caspase 3 expression was detected by immunohistochemistry. RESULTS: In rats with orchitis the number of Fas+ and FasL+ apoptotic germ cells increased from day 50, when the lesion develops, to 150 days, and correlates with the degree of testicular damage. Most spermatocytes expressing Fas were apoptotic. Many Fas+ germ cells were also immunoreactive for FasL. Moreover, these cells also expressed caspase 3. CONCLUSIONS: In rats with EAO germ cell death occurs through an apoptotic mechanism preceding germ cell sloughing. Immunohistochemical data suggest that the Fas-FasL system mediates germ cell apoptosis in an autocrine and/or paracrine way.
Authors: Cecilia V Pérez; María S Theas; Patricia V Jacobo; Sabrina Jarazo-Dietrich; Vanesa A Guazzone; Livia Lustig Journal: Spermatogenesis Date: 2013-01-01
Authors: Monika Fijak; Adrian Pilatz; Mark P Hedger; Nour Nicolas; Sudhanshu Bhushan; Vera Michel; Kenneth S K Tung; Hans-Christian Schuppe; Andreas Meinhardt Journal: Hum Reprod Update Date: 2018-07-01 Impact factor: 15.610