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Abstract
In ethane dimethane sulfonate (EDS)-treated adult Sprague Dawley rats, Leydig cells (LC) were not present up to 14 days but seen at 21 days. They increased in number thereafter and reached the values of age-matching controls (i.e., 150-day-old untreated) at day 60. Mesenchymal cell number per testis also increased and reached a peak at day 21, and remained at a higher ( p <.05) value than the controls at days 28-60. LC were smaller at day 21, but were larger at days 28-60 (compared to untreated 90- and 150-day-old rats) and secreted more testosterone at day 60 compared to both control groups. Testes of treated rats had greater numbers of macrophages (except at day 28) and they were smaller than those in untreated rats and 60-day EDS rats. Immunolabeling studies on 3 g -HSD, 11 g -HSD1, and LH receptor activity and androgen data agreed with morphological findings. The relationship between mesenchymal and LC numbers during LC differentiation following EDS treatment is reminiscent of this process in prepubertal testis. The presence of increased numbers of macrophages in treated testes agreed with the role of macrophages on LC differentiation. The absence of aging signs in LC of 60-day treated rats who were 150 days of age can be attributed at least in part to their newly differentiated status in older rats (i.e., equivalent to pubertal LC and not to aged LC). Larger LC observed in EDS rats at days 28-60 and their increased testosterone secretory capacity at day 60 (compared to controls) are attributed to elevated plasma LH levels and locally produced factors in EDS rats.