共查询到20条相似文献，搜索用时 265 毫秒
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每天在固定时间用不同梯度温度(42℃,37℃和33℃)处理实验组鼠1 h,热应激前后分别记录小鼠的肛温和体重.在应激的第8 d、13 d分别处死受试鼠后分离睾丸、附睾并分别称量其重量,计算睾丸、附睾与体重指数,将睾丸和附睾组织切片后镜检.结果表明,应激组小鼠的肛温显著升高(P＜0.05);睾丸和附睾内的精子数量、生精细胞上皮层数显著减少,精母细胞数量减少,且排列混乱,细胞的凋亡数量增多;而睾丸、附睾与体重指数无明显变化. 相似文献
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用组织学和免疫组织化学方法调查达乌尔黄鼠精子形成季节性变化和细胞色素芳香化酶(P450 arom)在精巢和附睾中的免疫位置。黄鼠繁殖期与非繁殖期精巢大小、重量、生精小管直径存在显著差异;黄鼠繁殖期精巢中存在从精原细胞到有尾精子各期生殖细胞,非繁殖期精巢中只存在精原细胞和初级精母细胞。另外,繁殖期黄鼠附睾管中存在大量有尾精子,而非繁殖期附睾中未见精子存在。繁殖期P450 arom在黄鼠精巢的间质细胞、支持细胞、精子细胞和附睾头部输出小管上皮细胞都有发现,而在非繁殖期没有发现它的活力。这些结果表明达乌尔黄鼠精子形成、成熟是伴随着精巢复发和退行呈现显著季节性变化,雌激素在精子形成和成熟过程中起着重要的生理性作用。 相似文献
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单次肌注亚硒酸钠硒在犊牛体内的药代动力学研究 总被引：1，自引：0，他引：1
实验研究了单次肌注(OAmg/kg)亚硒酸钠注射液后,不同时间采血,用荧光分光光度计测定血硒浓度。经微机处理获得出血硒浓度理论值及药动学参数。血硒浓度—时间曲线符合—室开放模型,最佳药时方程:Ci=0.8688×(e-0.0023t-e-15.8967t)。主要动力学参数:T_(1/2) Ka=0.05±0.01(hrε);T_(1/2) Kel=322.62±45.86(hrs);Tp=0.58±0.12(hrs);Cmax=0.8665±0.1031(μg/ml);AUC=387.26±45.51(mg/L·hrs)。按单剂量给药参数,用多剂量给药模型公式计算出多剂量给药参数。 相似文献
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Dandan Zhong Mengjie Chen Lei Zhang Hong Chen Deshun Shi Qingyou Liu Hui Li 《Reproduction in domestic animals》2021,56(1):3-11
Natural modifications of cellular RNA include various chemical modifications, such as N6-methyladenosine (m6A), which enable the orderly metabolism and function of RNA structural diversity, thereby affecting gene expression. Spermatogenesis is a complex differentiating developmental process, which includes the proliferation of spermatogonial stem cells, spermatocyte meiosis and sperm maturation. Emerging evidence has shown that RNA methylation can influence RNA splicing, exportation and translation, which are controlled in the male germline in order to ensure coordinated gene expression. In this review, we summarize the typical characteristics of different types of RNA methylation during the process of spermatogenesis. In particular, we emphasize the functions of the RNA methylation effectors during the male germ cell development. 相似文献
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Flow cytometric assessment of ethylene glycol monoethyl ether on spermatogenesis in rats 总被引：1，自引：0，他引：1
Yoon CY Hong CM Cho YY Chung YH Min HK Yun YW Lee BJ Yang KH Lee YS Kim CK 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2003,65(2):207-212
The effects of ethylene glycol monoethyl ether (EGEE) on testicular cell populations in rats were investigated by a flow cytometric method. Rats were administered by gavage with EGEE at the various doses of 0 (saline alone), 100, 200, 400, and 800 mg/kg body weight/day for 4 weeks. The treatment of EGEE caused decreases in the weight of testis and epididymis and in the number of testicular cells. Histopathologically, exfoliation of germ cells into the tubular lumen was observed at the doses of above 200 mg/kg. The treatment of EGEE at the dose of 400 mg/kg caused moderate testicular degeneration. A significant depletion of haploid cells and a disproportionate ratio of diploid and tetraploid cells were observed as determined by flow cytometric analysis. These results indicate that the toxic effect of EGEE on the male reproductive system may be strongly associated with the disproportion of testicular germ cells. 相似文献
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《中国兽医学报》2020,(1):188-195
为了筛选出与精子发生有关的lncRNAs,本研究利用Illumina HiseQ 4000平台对山羊在出生期、初情期和成年期3个阶段的睾丸进行了lncRNAs测序分析。共产生了8 183个新的lncRNAs转录本。不同组间lncRNAs的差异表达分析显示,分别有1 167,5 392和5 465条lncRNAs转录本的表达有显著性差异,随机选择9个差异表达的基因进行qPCR验证,定量结果与测序结果一致。对lncRNAs的靶基因进行预测,其中5 477个编码蛋白的基因受到顺式作用调控,445个编码蛋白的基因受到反式作用调控。将差异显著的lncRNAs的靶基因进行了GO功能富集分析和KEGG途径富集分析,共有57个候选mRNA富集到精子发生功能中,它们分别靶向到50条新发现的lncRNAs,选出3个进行qPCR验证发现其在不同时期差异显著且表达趋势与靶基因一致,推测这些lncRNAs可能对靶基因有调控作用。该研究为进一步了解lncRNAs在睾丸发育和精子发生中的功能和机制提供了数据支持,极大地缩小了与精子发生相关lncRNA的研究范围,为揭示雄性的生殖功能提供了重要靶点。 相似文献
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J. Kumi-Diaka D. I. K. Osori C. O. Njoku D. Ogwu 《Veterinary research communications》1983,6(1):215-222
Spermatogenesis in bulls (Bos indicus) indigenous to Nigeria, and the significance of Sertoli cell index (SCI) as a measure of testicular degeneration were studied. The mean testicular weights and dimensions were lower than reported forBos taurus breeds. The diameters of the seminiferous tubules were lower than reported forBos taurus, although within the same range. Inter-month and intra-month variations were highly significant (P<0.01). A mean annual spermatogenesis of 77.60% was reported. Active spermatogenesis was observed throughout the year, with a peak during the rainy season and extending toward the predry season. This was consistent with previous reports. Severe testicular degeneration was found to influence spermatogenesis. This was reflected in the decrease in SCI. Mild degeneration had no significant effect on spermatogenesis, and did not significantly change the SCI. The SCI was defined as the ratio of the number of germinal cells to the number of Sertoli cells in the same cross sections of tubules. 相似文献
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Six breeding rams were fed a diet containing 12 mg of zearalenone daily for eight weeks. A control group of six rams was fed a diet free of zearalenone. The weekly production of spermatozoa of both groups was measured during the period of administration of zearalenone and for six weeks after the administration of zearalenone ceased. Semen production was measured in terms of the volume of ejaculate and its concentration, and the motility and abnormalities in the spermatozoa. The feeding of zearalenone had no significant effects on any of these measurements. 相似文献
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Sugiura S Kashiwabara S Iwase S Baba T 《The Journal of reproduction and development》2003,49(1):107-111
The gene encoding TATA-binding protein-related factor 2 (TRF2/TLF/TLP/TRP), essential for the progress of spermiogenesis, is abundantly expressed in mammalian testis. A sequence database search revealed that mouse TRF2 is encoded by two mRNAs containing the same protein-coding region and different 5'-untranslated regions. Northern blot analysis using DNA probes specific for the 5'-untranslated regions demonstrated that these two mRNAs are distinguished from each other by the expression patterns: ubiquitous and testis-specific expression. The ubiquitously expressed form of TRF2 mRNA was present at a very low level throughout testicular development, whereas expression of the testis-specific form was first detectable in the 14-day-old testis, and the mRNA level abundantly increased at the later stages of testicular development. Western blot analysis indicated that the TRF2 level increases during testicular development, which is consistent with the expression pattern of the testicular form of TRF2 mRNA. Thus, the presence of the testis-specific form of TRF2 mRNA may account for overexpression of the TRF2 gene in the testis. 相似文献