Selecting oocytes that are most likely to develop is crucial for in vitro fertilization and animal cloning. Brilliant cresyl blue （BCB） staining has been used for oocyte selection in large animals, but its wider uti...Selecting oocytes that are most likely to develop is crucial for in vitro fertilization and animal cloning. Brilliant cresyl blue （BCB） staining has been used for oocyte selection in large animals, but its wider utility needs further evaluation. Mouse oocytes were divided into those stained （BCB＋） and those unstained （BCB-） according to their ooplasm BCB coloration. Chromatin configurations, cumulus cell apoptosis, cytoplasmic maturity and developmental competence were compared between the BCB＋ and BCB- oocytes. The effects of oocyte diameter, sexual maturity and gonadotropin stimulation on the competence of BCB＋ oocytes were also analyzed. In the large- and medium-size groups, BCB＋ oocytes were larger and showed more surrounded nucleoli （SN） chromatin configurations and higher frequencies of early atresia, and they also gained better cytoplasmic maturity （determined as the intracellular GSH level and pattern of mitochondrial distribution） and higher developmental potential after in vitro maturation （IVM） than the BCB-oocytes. Adult mice produced more BCB＋ oocytes with higher competence than the prepubertal mice when not primed with PMSG. PMSG priming increased both proportion and developmental potency of BCB＋ oocytes. The BCB＋ oocytes in the large-size group showed more SN chromatin configurations, better cytoplasmic maturity and higher developmental potential than their counterparts in the medium-size group. It is concluded that BCB staining can be used as an efficient method for oocyte selection, but that the competence of the BCB＋ oocytes may vary with oocyte diameter, animal sexual maturity and gonadotropin stimulation. Taken together, the series of criteria described here would allow for better choices in selecting oocytes for better development.展开更多
目的蓝氏贾第鞭毛虫作为一种重要的人兽共患寄生虫病贾第虫病的病原,其对SPF实验动物质量造成的潜在威胁不容忽视。本研究的目的是建立蓝氏贾第鞭毛虫快速诊断方法,并对17个生产厂家516批2562只SPF实验动物检查结果进行分析。方法用直...目的蓝氏贾第鞭毛虫作为一种重要的人兽共患寄生虫病贾第虫病的病原,其对SPF实验动物质量造成的潜在威胁不容忽视。本研究的目的是建立蓝氏贾第鞭毛虫快速诊断方法,并对17个生产厂家516批2562只SPF实验动物检查结果进行分析。方法用直接镜检法、快速姬姆萨染色法和多重PCR方法,对蓝氏贾第鞭毛虫进行检测。结果在SPF实验动物中检出数量众多的蓝氏贾第鞭毛虫滋养体和包囊,鉴定出蓝氏贾第鞭毛虫18S r DNA、β-giardin、TPI和GDH基因。直接镜检法、快速姬姆萨染色法和多重PCR方法均能检出蓝氏贾第鞭毛虫。17个生产厂家516批2562只SPF实验动物蓝氏贾第鞭毛虫阳性检出率22.9%(586/2562)。结论直接镜检法、快速姬姆萨染色法和多重PCR方法具有高度的敏感性和特异性,可用于蓝氏贾第鞭毛虫的快速诊断。17个生产厂家516批SPF实验动物蓝氏贾第鞭毛虫检查结果未能全部符合规定。展开更多
基金Acknowledgments This study was supported by grants from the China National Natural Science Foundation （Nos. 30430530 and 30571337） and from the Momentous Research Project of the China Ministry of Science and Technology （No. 2006CB944003）.
文摘Selecting oocytes that are most likely to develop is crucial for in vitro fertilization and animal cloning. Brilliant cresyl blue （BCB） staining has been used for oocyte selection in large animals, but its wider utility needs further evaluation. Mouse oocytes were divided into those stained （BCB＋） and those unstained （BCB-） according to their ooplasm BCB coloration. Chromatin configurations, cumulus cell apoptosis, cytoplasmic maturity and developmental competence were compared between the BCB＋ and BCB- oocytes. The effects of oocyte diameter, sexual maturity and gonadotropin stimulation on the competence of BCB＋ oocytes were also analyzed. In the large- and medium-size groups, BCB＋ oocytes were larger and showed more surrounded nucleoli （SN） chromatin configurations and higher frequencies of early atresia, and they also gained better cytoplasmic maturity （determined as the intracellular GSH level and pattern of mitochondrial distribution） and higher developmental potential after in vitro maturation （IVM） than the BCB-oocytes. Adult mice produced more BCB＋ oocytes with higher competence than the prepubertal mice when not primed with PMSG. PMSG priming increased both proportion and developmental potency of BCB＋ oocytes. The BCB＋ oocytes in the large-size group showed more SN chromatin configurations, better cytoplasmic maturity and higher developmental potential than their counterparts in the medium-size group. It is concluded that BCB staining can be used as an efficient method for oocyte selection, but that the competence of the BCB＋ oocytes may vary with oocyte diameter, animal sexual maturity and gonadotropin stimulation. Taken together, the series of criteria described here would allow for better choices in selecting oocytes for better development.
文摘目的蓝氏贾第鞭毛虫作为一种重要的人兽共患寄生虫病贾第虫病的病原,其对SPF实验动物质量造成的潜在威胁不容忽视。本研究的目的是建立蓝氏贾第鞭毛虫快速诊断方法,并对17个生产厂家516批2562只SPF实验动物检查结果进行分析。方法用直接镜检法、快速姬姆萨染色法和多重PCR方法,对蓝氏贾第鞭毛虫进行检测。结果在SPF实验动物中检出数量众多的蓝氏贾第鞭毛虫滋养体和包囊,鉴定出蓝氏贾第鞭毛虫18S r DNA、β-giardin、TPI和GDH基因。直接镜检法、快速姬姆萨染色法和多重PCR方法均能检出蓝氏贾第鞭毛虫。17个生产厂家516批2562只SPF实验动物蓝氏贾第鞭毛虫阳性检出率22.9%(586/2562)。结论直接镜检法、快速姬姆萨染色法和多重PCR方法具有高度的敏感性和特异性,可用于蓝氏贾第鞭毛虫的快速诊断。17个生产厂家516批SPF实验动物蓝氏贾第鞭毛虫检查结果未能全部符合规定。
