Study on testis gene chip of mouse model with syndrome of deficiency of kidney yang / 中华中医药杂志

Objective: To inquire into the testis gene change of mouse model with kidney-yang deficiency induced by overfatigue and excessive sexual life, the modern science mechanism of syndrome of kidney-yang deficiency and kidney controlling reproduction can be revealed on the gene level. Methods: The model of kidney-yang deficiency was established by each male mouse with six female mice keeping in the same cage, and all the male mice were forced to swim for 30-40 minutes everyday lasting for four weeks. The testis genes of mice in control group and model group were detected with Mouse OneArrayTM Whole Genome DNA microarray. The differentially expressed genes were screened under the condition of the relative fluorescence intensity ratio of the two groups ≥2 and ≤0.5 and further classified according to gene function by using Molecule Annotation System (MAS) created by CapitalBio Corp. Beijing, China. Results: The mouse model with kidney-yang deficiency was established successfully by the method of overfatigue and excessive sexual life. The scatter plot of gene expression profiles of comparing control group with model group was drawn. Differentially expressed genes were screened, including 2425 up-regulated genes and 3080 down-regulated genes. Among the first one hundred up-regulated genes, 41 genes were known and among the first one hundred down-regulated genes, 62 genes were known. These genes were mainly related to the cellular structure/function, material/energy metabolism, signal transduction/transmission, inflammation/immunization, cell apoptosis, transcription/translation,proliferation/differentiation and cell cycle. Conclusion: The testis gene of kidney-yang deficiency mouse had a wide change. The essence of kidney-yang deficiency syndrome and the theory of the kidney originating and controlling life reproduction were explained on the gene level.

Protective Effect of Several Metals Against Cadmium Injury to Mouse Testicle / 대한비뇨기과학회지

One of the most obvious effects of cadmium poisoning in experimental animals is induction of testicular necrosis. Many studies have been conducted, but the mechanism of the disturbance, which is peculiar to the testicle, has not been elucidated. Testicular damage due to cadmium exposure greatly differs depending upon strains of mice and methods of administration. As a preventive measure against testicular necrosis due to cadmium, pretreatment of small doses of cadmium and several kinds of metals have been found to be effective. In order to examine testicular damage by cadmium doses and protective effects by small doses of metals (Cd, Cu, Se, Mn) and phenobarbital which were administered before single challenge dose of cadmium, mature male I. C. R. mice, 16 weeks of age, weighing approximately 40g were used in this study. The weights of the body and the testicle, cadmium concentration in the testicle and results of histopathological findings of the experimental groups were as follows. 1. With regard to the body weight of each group that was injected intraperitoneally with single cadmium doses of 0.5, 1.O, 2.O and 3.Omg/kg the last two groups showed a significant decrease in one week. 2. Relative testicular weight (testicular weight ,body weight) one week after cadmium administration decreased significantly in the group of more than 1.Omg/kg administration. However, in the pretreatment groups, it was found that the group pretreated with cadmium did not decrease. 3. Cadmium concentration in the testicle in each group increased with the amount of cadmium doses. However, in the pretreatment group, the groups pretreated with cadmium and manganese did not increase. 4. In histopathological findings of the testicle on the 7the day after cadmium administration, the minimum dose of cadmium that induced edema in the interstitial tissue and inactive spermatogenesis in a few germinal epithelia was O.5 mg/kg, but the changes seemed to be due to inhibitory effect for spermatogenesis rather than direct injury to the testicular tissue. Necrosis was observed in the spermatogenic epithelium in the 2.O mg/kg group and severe necroses were extended to the interstitial tissue in the 3.O mg/kg group. The critical concentrations of cadmium for the histopathological change in the testicular tissue was 0.32ug/g and that for necrotic change was 0.60ug/g. 5. Protective effect in the pretreatment groups was noticeable in the cadmium pretreated group and moderate effect in the manganese group; however, in the other metal groups and the phenobarbital group little effect was observed. 6. Comparison of the histopathological findings between the group of pretreatment showing effect.

THE HISTOLOGICAL OBSERVATION OF THE STEPWISE DEVELOPMENT OF NEONATAL MOUSE TESTIS IN IMMUNODEFICIENT MICE / 解剖学报

Objective To investigate the development of neonatal mouse testis in castrated immunodeficient mice by monitoring the graft survival and weight and observing the structure of seminiferous epithelium and the composition of spermatogenic cells in grafts. Methods Neonatal Kun-ming mouse testis were grafted under the skin of castrated nude mice(7-12week-old).Grafts were then taken out at different time intervals(namely 16 time points: 3 days,1-11 weeks respectively and 3-6 months respectively).The survival rate of grafts was calculated and the wet weight was measured.Histological analysis was performed for the observation of the structure of seminiferous epithelium and the composition of spermatogenic cells in grafts. Results Four hundrcd and five grafts recovered out of 450 testis grafted, resulting in a recovery rate of 90.0%.The graft weight increased more than 40 times.The developmental pattern of seminiferous tubules and the appearance time of various spermatogenic cells in grafts were similar as seen in intact mice.Eight weeks after the grafrting,an increasing degradation of seminiferous epithelium was observed.Conclusion When neonatal mouse testis were grafted into nude mice,the developmental course was similar as that in normal donors.The optimal retrieval time of round spermatids and sperms was around the end of the first spermatogenesis wave,about 5-7weeks after the grafting procedure.