Introduction: Inappropriate and excess vitamin supplementation, particularly for vitamin A, is increasingly recognized as a public health problem in developed countries. On the other hand, blind supplementation of vit...Introduction: Inappropriate and excess vitamin supplementation, particularly for vitamin A, is increasingly recognized as a public health problem in developed countries. On the other hand, blind supplementation of vitamin A, for children in developing countries is a subject of controversy in the literature. The crucial role of vitamin A in the process of spermatogenesis in adult rodents is well established, but only a few publications are consecrated to the long-term effect of vitamin A intake at a young age on testicular development and differentiation. Objectives: Our study aimed to evaluate the long-term effects of acute supplementation at an early age, in the post-natal period, on spermatogenesis and testicular trophicity at adult age. Material and Methods: Young Wistar Albinos rats of 22 days received an acute high dose of supplementation of vitamin A (retinyl palmitate). The control group, group 1, received only extra virgin olive oil, Group 2 a dose of 7000 IU/kg of retinyl palmitate, group 3, 14,000 IU/kg, and Group 4 a dose of 28,000 IU/kg. At 10 weeks of age, the testes’ testosterone levels were measured by ELISA. For histological assessment, sections were stained with Hematoxylin eosin, and the Johnsen score was used to evaluate spermatogenesis in the seminiferous tubules. Results: The average testicular weights of rats were significantly lower in group 4 (p < 0.05), and so was the testosterone level in the testis compared to the control group (p .01). Most of the seminiferous tubules were concerned by an arrest of spermatogenesis and the Johnsen score was decreased with a mean score of 5.96 ± 1.60 (p .001) in that Group. In Group 3, Johnsen’s score was significantly better than the one obtained with the control. Conclusion: We observed a negative effect in the long term with a high acute dose of supplementation of retinyl palmitate at a young age, on testicular development and differentiation. Despite a return to normal diet after that supplementation, during childhood, impaired spermatogenesis was identified at the adult age with an arrest of spermatogenesis. The reversibility of that lack of differentiation by a return to a normal diet is questionable and would need more investigation.展开更多
目的观察血液样本处理方式对大鼠血液生化指标检测结果的影响。方法取体重180~220 g的SPF级Wistar大鼠40只,雌雄各半,禁食不禁水12 h后,用3%戊巴比妥钠麻醉后取全血和肝素抗凝血各3 m L。将每种血样分别置于3个1.5 m L的离心管和肝素抗...目的观察血液样本处理方式对大鼠血液生化指标检测结果的影响。方法取体重180~220 g的SPF级Wistar大鼠40只,雌雄各半,禁食不禁水12 h后,用3%戊巴比妥钠麻醉后取全血和肝素抗凝血各3 m L。将每种血样分别置于3个1.5 m L的离心管和肝素抗凝管中各1 m L,并分别在室温放置1 h、2 h、4 h后进行离心,测定血糖、血脂、蛋白、肝功能、肾功能、心肌酶等指标。结果血液样本类型和采集后离心前的放置时间对Wistar大鼠的血清或血浆TC、TG、TP、ALB、ALT、ALP、BUN和CREA等指标均无明显影响（P〉0.05）。但血浆的GLU值显著高于血清（P〈0.05,P〈0.01）,并随着采集后离心前放置时间的延长持续下降。血清AST和CK、LDH值则均显著高于血浆（P〈0.05,P〈0.01）,且随采集后离心前放置的延长呈现持续显著的上升（P〈0.05,P〈0.01）。而采集后离心前放置时间对Wistar大鼠血浆AST和CK、LDH值均无明显影响（P〉0.05）。结论血液样本类型对血脂、蛋白和肾功能指标无明显影响,但对GLU、AST、CK、LDH等检测结果有一定影响。采集后离心前的放置时间延长可导致血清血浆GLU下降,血清AST、CK、LDH升高,但对血浆AST、CK、LDH指标无明显影响。展开更多
文摘Introduction: Inappropriate and excess vitamin supplementation, particularly for vitamin A, is increasingly recognized as a public health problem in developed countries. On the other hand, blind supplementation of vitamin A, for children in developing countries is a subject of controversy in the literature. The crucial role of vitamin A in the process of spermatogenesis in adult rodents is well established, but only a few publications are consecrated to the long-term effect of vitamin A intake at a young age on testicular development and differentiation. Objectives: Our study aimed to evaluate the long-term effects of acute supplementation at an early age, in the post-natal period, on spermatogenesis and testicular trophicity at adult age. Material and Methods: Young Wistar Albinos rats of 22 days received an acute high dose of supplementation of vitamin A (retinyl palmitate). The control group, group 1, received only extra virgin olive oil, Group 2 a dose of 7000 IU/kg of retinyl palmitate, group 3, 14,000 IU/kg, and Group 4 a dose of 28,000 IU/kg. At 10 weeks of age, the testes’ testosterone levels were measured by ELISA. For histological assessment, sections were stained with Hematoxylin eosin, and the Johnsen score was used to evaluate spermatogenesis in the seminiferous tubules. Results: The average testicular weights of rats were significantly lower in group 4 (p < 0.05), and so was the testosterone level in the testis compared to the control group (p .01). Most of the seminiferous tubules were concerned by an arrest of spermatogenesis and the Johnsen score was decreased with a mean score of 5.96 ± 1.60 (p .001) in that Group. In Group 3, Johnsen’s score was significantly better than the one obtained with the control. Conclusion: We observed a negative effect in the long term with a high acute dose of supplementation of retinyl palmitate at a young age, on testicular development and differentiation. Despite a return to normal diet after that supplementation, during childhood, impaired spermatogenesis was identified at the adult age with an arrest of spermatogenesis. The reversibility of that lack of differentiation by a return to a normal diet is questionable and would need more investigation.
文摘目的观察血液样本处理方式对大鼠血液生化指标检测结果的影响。方法取体重180~220 g的SPF级Wistar大鼠40只,雌雄各半,禁食不禁水12 h后,用3%戊巴比妥钠麻醉后取全血和肝素抗凝血各3 m L。将每种血样分别置于3个1.5 m L的离心管和肝素抗凝管中各1 m L,并分别在室温放置1 h、2 h、4 h后进行离心,测定血糖、血脂、蛋白、肝功能、肾功能、心肌酶等指标。结果血液样本类型和采集后离心前的放置时间对Wistar大鼠的血清或血浆TC、TG、TP、ALB、ALT、ALP、BUN和CREA等指标均无明显影响（P〉0.05）。但血浆的GLU值显著高于血清（P〈0.05,P〈0.01）,并随着采集后离心前放置时间的延长持续下降。血清AST和CK、LDH值则均显著高于血浆（P〈0.05,P〈0.01）,且随采集后离心前放置的延长呈现持续显著的上升（P〈0.05,P〈0.01）。而采集后离心前放置时间对Wistar大鼠血浆AST和CK、LDH值均无明显影响（P〉0.05）。结论血液样本类型对血脂、蛋白和肾功能指标无明显影响,但对GLU、AST、CK、LDH等检测结果有一定影响。采集后离心前的放置时间延长可导致血清血浆GLU下降,血清AST、CK、LDH升高,但对血浆AST、CK、LDH指标无明显影响。
