Abstract
Extracellular superoxide dismutase (SODEX), an antioxidant enzyme, was found to be present in the testis at a relatively high
concentration versus other organs. In a more detailed survey of several rat tissues
and cells by reverse transcriptase-polymerase chain reaction, it was shown that germ
cells expressed approximately one-third that of Sertoli cells, suggesting both cell
types are equipped with the machinery needed to defend themselves from radical-induced
damage. When we used an in vitro model in which germ cells were co-cultured with Sertoli
cells at a Sertoli:germ cell ratio of 1:1, we failed to detect any changes in the
mRNA level of SODEX. However, the addition of increasing concentrations of germ cell secretory proteins
into Sertoli cell cultures resulted in a decrease in Sertoli cell SODEX expression, illustrating that germ cells can indeed regulate Sertoli cell SODEX. On the other hand, Sertoli cell SODEX expression was stimulated when human recombinant interleukin-1α (IL-1α), a germ cell
product, was included into Sertoli cells in vitro. These results, taken collectively,
suggest SODEX is an important antioxidant molecule in the testis that is under germ cell regulation.
Keywords
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