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Reproductive function in male rats with chronic nephrosis
G Ortiz1, F Vilchis, M Cárdenas
1Department of Reproductive Biology, Hospital Juárez de México, Mexico City.
Abstract:
Endocrine dysfunction has been associated with renal diseases. The present study was conducted to explore reproductive function in male rats with chronic nephrosis. Experimental chronic nephrosis was induced by the administration of 7.5, 5.0 and 5.0 mg per 100 g body weight of puromycin aminonucleoside on days 0, 21 and 35, respectively. Reproductive function was evaluated on the basis of hormonal concentrations, mass of accessory sex organs and fertility during an 84 day period. Circulating LH, FSH, testosterone and oestradiol concentrations were measured by specific radioimmunoassays, while fertility was estimated by the rate of pregnancy induction. Samples were collected on days 7, 14, 28, 56 and 84. The results showed an important endocrine dysfunction characterized by low concentrations of LH and FSH during the first month, after which concentrations were similar to control values or even increased on days 56 and 84. Testosterone and oestradiol decreased significantly at all time points evaluated. The mass of the testes did not alter. However, the mass of the prostate and seminal vesicle decreased only during the first 2 weeks, and became essentially normal thereafter. The reproductive capacity of nephrotic males was eliminated on day 7, whereas on day 14, 16% of the group was able to mate successfully and subsequently most animals recovered their normal reproductive function. This study demonstrates for the first time that rats with experimental chronic nephrosis develop an important endocrine dysfunction, characterized mainly by persistent reduction in testosterone concentrations, which impairs reproductive capacity only transiently.
Insights
Male rats with chronic nephrosis experienced transient reproductive dysfunction due to endocrine changes. Persistent low testosterone levels in nephrotic rats temporarily impaired fertility, but function recovered over time.
Area of Science:
- Endocrinology
- Nephrology
- Reproductive Biology
Background:
- Endocrine dysfunction is linked to renal diseases.
- Chronic nephrosis can impact male reproductive health.
- Understanding these links is crucial for managing kidney disease complications.
Purpose of the Study:
- To investigate the effects of experimental chronic nephrosis on male rat reproductive function.
- To analyze hormonal changes, accessory sex organ mass, and fertility in nephrotic rats.
- To determine the transient or persistent nature of reproductive impairment.
Main Methods:
- Induction of chronic nephrosis using puromycin aminonucleoside in male rats.
- Evaluation of reproductive parameters over 84 days, including hormonal assays (LH, FSH, testosterone, oestradiol) and fertility assessments.
- Measurement of accessory sex organ weights (testes, prostate, seminal vesicles).
Main Results:
- Nephrotic rats showed initial decreases in LH and FSH, followed by normalization or increase.
- Significant reductions in testosterone and oestradiol were observed throughout the study.
- Reproductive capacity was initially eliminated but showed recovery by day 14, with most animals regaining normal function.
Conclusions:
- Experimental chronic nephrosis induces significant endocrine dysfunction in male rats.
- Persistent reduction in testosterone is the primary cause of transiently impaired reproductive capacity.
- Male rats with experimental chronic nephrosis can recover reproductive function over time.