O impacto na expressão agnors e apoptose na próstata do hamster-mesocricetus auratus (HMA) submetido à aplicação de finasterida

OBJETIVO: Avaliar o impacto na expressão AgNORs e apoptose na próstata do hamster-Mesocricetus auratus (hMa) submetido à aplicação de finasterida. MÉTODOS: Vinte roedores da espécie hMa (n=20), machos foram separados aleatoriamente em grupos de dez animais: grupo-Finasterida (n=10) e grupo-Controle (n=10). No grupo-finasterida foi administrado 7,14 ng/mL de finasterida, subcutâneo (SC), no dorso, três vezes por semana, por 90 dias. Foi avaliada a expressão AgNORs como marcador de proliferação celular e a apoptose como marcador de morte celular. RESULTADOS: A expressão de AgNORs foi menor no grupo-finasterida, 2,846±0,877 versus 3,68 ±1,07 grumos argilófilos por micrômetro ao quadrado (µm²) no grupo-controle, p= < 0,0001. A apoptose foi mais frequente no grupo-finasterida, 53,62±1,389 versus 14,76 ± 2,137 µm² no grupo-controle, p= 0,0408. CONCLUSÃO: Observou-se diminuição da expressão de AgNORs e promoção da apoptose na próstata dos roedores em estudo, que foram submetidos à aplicação de finasterida.

The impact in the agnors expression and apoptosis in the prostate of hamster-mesocricetus auratus (HMA) submitted to finasteride application

OBJECTIVE

To evaluate the impact on the AgNORs expression and apoptosis in the prostate of the hamster-Mesocricetus auratus (HMA) submitted to the application of finasteride.

METHODS

Twenty male rodents of the species HMA (n = 20) were randomly assigned to groups of ten animals: Finasteride group (n = 10) and the Control group (n = 10). In the finasteride group 7.14 ng / mL finasteride was subcutaneously (SC) administered on the back of the animals three times a week for 90 days. AgNOR expression was evaluated as a marker of cell proliferation and apoptosis as a marker of cell death.

RESULTS

The expression of AgNORs was lower in the finasteride group, 2.846 ± 0.877 vs. 3.68 ± 1.07 argyrophilic regions per square micrometer (µm2) in the control group, p = <0.0001. Apoptosis was more frequent in the finasteride group, 53.62 ± 1.389 versus 14.76 ± 2.13 per µm2 in the control group, p = 0.0408.

CONCLUSION

We observed decreased expression of AgNORs and promotion of apoptosis in the prostate of rodents treated with finasteride.

Effect of finasteride on serum prostate-specific antigen (PSA) and on prostate of hamster Mesocricetus auratus (hMa)

PURPOSE

Evaluate the effects of finasteride on the serum PSA and on the prostate of hamster-Mesocricetus auratus(hMa).

METHODS

Twenty hMa male adults were split in groups control and experimental (n=10). Animals of the experimental group received 7.14ng/mL of finasteride, subcutaneously (SC) on the back three times per week, during 90 days. The finasteride dose was equivalent to 5.0mg administered to a 70kg man. At the end of the experiment the mean age for the animals in the control group was 15.2 + or - 1.13 months and for the experimental group was 17.7 + or - 0.67 months. There was a statistically significant difference between mean ages of both groups (t value=5.98; p=0.001). The animals of the control group weighted 129.0 + or - 18.8g and the experimental group weighted 145.0 + or - 15.5g, t=1.88 e p=0.0514. The serum PSA was assessed through ELISA method. Prostates of those animals were collected and processed to histology and morphometry: the diameter of the acinous glands and the acinous epithelium, apoptosis, AgNORs and cellularity were assessed in both groups.

RESULTS

Serum PSA decreased in the experimental group, 0.003ng/mL versus 0.763ng/mL, H= 7.982 e p= 0.0047. Decrease in the acinous area occurred in animals that received finasteride, 238.000 + or - 24.600 microm(2) versus 398.600 + or - 55.320 microm(2); t= 2.653; p= 0.0122. A remarkable decrease in the area of the acinous epithelium occurred in the animals that received finasteride, 111.900 + or -12.820 microm(2) versus 160.400 + or - 18.430 microm(2) t= 2.162; p= 0.0361. AgNORs were less expressed in finasteride treated animals, 2.846 + or - 0.877 versus 3.68 + or - 1.07 argyrophilic clusters for microm(2), p= < 0.0001. Apoptosis was more intense in the experimental group, 53.62 + or - 1.389 than in controls, 14.76 + or - 2.137, p= 0.0408. However, there was no statistical difference in the cellularity between both groups, 74.75 + or - 5.5 cells, in controls versus 65.07 + or - 13.24, in treated animals, p=0.5105.

CONCLUSIONS

Use of finasteride decreased serum PSA and several histological parameters of the Hamster's prostate, such as lumen area, acinous and epithelium area, and AgNORs expression. Finasteride increased apoptosis in the prostate acinous cells although no significant difference in the cellularity could be found between the two groups of animals under study.

The effect of finasteride on spermatogenesis of Mesocricetus auratus

PURPOSE: To study the effect of finasteride on the spermatogenesis of adult Mesocricetus auratus. METHODS: Twenty adult hamsters were evaluated. The animals were one year-older, and were randomly divided in 2 different groups: control group with ten animals (n=10) and experimental group also with ten animals (n=10). The animals in the experimental group were shot 7.14 ng/mL (0.5mL) of finasteride by 100mg/Kg, subcutaneously in the dorsal region three times per week during 90 days. This dose correspondes to 5mg of the drug used in adult men for the treatment of benign prostatic hyperplasia (BPH). After three months, the animals were anesthetized through association of 200mg/kg ketamine chloridrate and 2.5 mg/kg of diazepan and were dead through hypovolemia.. The testis removed along with the whole genitourinary apparel were fixed with 10% formalin and submitted to histological analisys by optical microscopy. The hematoxilin-eosin (HE) method was used to stain the slides. RESULTS: The mean weight of animals in the control group before death was 129.0±18.8gr. The mean weight of animals in experimental group was 145.0±15.25gr. The mean age of animals in control group before death was 15.2±1.13 months. The mean age of animals in experimental group before death was 17.16±0.82 months. The mean difference in weight between both groups was not statistical significant (p=0.0514). The totality of animals in control group (100%) presented no tubular alterations and showed no disturbancy in the spermatogenesis stages. Four animals (40%) in the experimental group showed hypotrophy of the seminiferous tubules and six (60%) showed normal spermatogenesis, however reduced compared to control group. There was statiscally significant difference (p=0.043) between the control and experimental group related to testicular alterations. CONCLUSION: The animals that were administered finasteride showed significant tubules atrophy and spermatogenesis reduction compared to control group.