L'influence de divers métabolites glucidiques sur l'intensité respiratoire du testicule de rat blanc

The Metabolic Activity of the Bovine Epididymis

“…In an earlier study, Turner & Johnson (1973) found that the 14C02 evolution of G-3,4 ([3,4-14C02]glucose) approached the rate shown for S-l in this study. Other researchers have shown a higher preference for Krebs' cycle intermediates than for glucose by spermatozoa (O'Shea & Voglmayr, 1970), testicular tissue (Serfaty & Boyer, 1956) and epididymal homogenates (Elliot, 1965b). Whereas this study found acetate to be utilized preferentially to glucose, Annison et al (1963) in a study on ram testicular and epididymal metabolism in vivo found uniformly labelled acetate to be utilized at a lower rate than uniformly labelled glucose.…”

“…This is in contrast to a later study in vivo on the ram by Annison, Scott & Wakes (1963) where testicular and epididymal tissue utilized uniformly labelled glucose in preference to uni¬ formly labelled acetate. In studies on testicular tissue, pyruvate has been shown to cause greater 02 uptake than glucose (Elliot, Greig & Benoy, 1937;Serfaty & Boyer, 1956). Lactate also has been shown to cause greater 02 uptake than glucose (Elliot et al, 1937).…”

Exogenous lactate is essential for metabolic activities in isolated rat spermatocytes and spermatids

“…In isolated testicular tissue from adult rats, the addition of glucose to the incubation medium resulted in increased RNA synthesis (Hollinger & Hwang, 1972), protein synthesis (Means & Hall, 1968b; Davis, 1969;Hollinger & Hwang, 1972), ATP levels (Means & Hall, 1968a) and oxygen consumption (Tepperman, Tepperman & Dick, 1949;Serfaty & Boyer, 1956;Gomes, 1971). Testicular protein synthesis was increased 7-fold by glucose while in 16 other tissues from adult rats the stimulation was less than 1-5 times (Davis, 1969).…”

Free amino acids of testes. Concentrations of free amino acids in the testes of several species and the precursors of glutamate and glutamine in rat testes in vivo

“…Insulin hypoglycaemia is damaging to both tissues. Studies by various investigators have suggested dependency of testicular tissue on glucose utilization (Schuler, 1944;Serfaty & Boyer, 1956;Mancini et al, 1960;Free, 1970). No comprehensive study of comparison of possible precursors in vivo of free amino acids in testicular tissue has been reported.…”