The aim of the present study was to develop a new animal model for use in uterine torsion, uterine ischemia-reperfusion, and fetal hypoxia studies in rats. A total of 14 pregnant rats on their 18 th-19 th gestational ...The aim of the present study was to develop a new animal model for use in uterine torsion, uterine ischemia-reperfusion, and fetal hypoxia studies in rats. A total of 14 pregnant rats on their 18 th-19 th gestational days were used. The animals were randomly divided into two groups: those undergoing the shame operation(group 1),and those in which a 360 uterine torsion was performed using a novel technique,which was corrected 6 hours later(group 2). Subsequently, seven female and seven male rat pups aged 1 month were separated from the mothers in each group. The female rats were monitored until puberty via measuring the vaginal apertures. The 1-month old male rats and the female rats on reaching puberty were decapitated and histopathological tests were performed on the dissected organs, including the cerebral, visceral and genital organs. At the end of the study, no differences were observed between the groups with regard to abortions, offspring death rates and congenital abnormalities. It was observed that the time to reach puberty in female rats born from mothers with uterine torsion was longer, but the difference was statistically insignificant. No microscopic lesions were detected in the cerebral, visceral or genital organs of the offspring. Accordingly, it was concluded that offspring of mothers with the uterine torsion were not affected, at least in the short term. It was generally concluded that this animal model is appropriate for use in uterine torsion and ischemia-reperfusion studies, but is not appropriate for fetal hypoxia studies.展开更多
BACKGROUND： Both c-Fos protein and nitricoxide synthase （NOS） have been used as general indexes in relative research about neurons, but it is lack of reports that c-Fos protein and NOS are applied synchronously to ...BACKGROUND： Both c-Fos protein and nitricoxide synthase （NOS） have been used as general indexes in relative research about neurons, but it is lack of reports that c-Fos protein and NOS are applied synchronously to study the neurons of hypoxic fetal rats in uterus. OBJECTIVE： To study the effect of hypoxia in uterus on the expression of c-Fos protein and NOS in neurons of cerebral cortex from fetal rats and whether Angelica sinensis has the protective effect on these neurons in hypoxia. DESIGN： Randomized control experiment.SETTING ： Department of Histology and Embryology, Luzhou Medical College.MATERIALS ： Twelve adult female Wistar rats in oestrum and 1 male Wistar rat with bodymass from 220 to 250 g were chosen. Parenteral solution of Angelica sinensis mainly contained angelica sinensis, 10 mL/ampoule, was provided by Department of Agent of the Second Hospital Affiliated to Hubei Medical University （batch number： 01062310）. METHODS ： This experiment was completed in the Department of Histology and Embryology of Luzhou Medical College from September 2003 to June 2004. ①Twelve adult female Wistar rats in oestrum and 1 male Wistar rat were housed in one rearing cage. Vaginal embolus was performed on conceive female rat at 8： 00 am next day. On the 15^th conceiving day, all conceiving rats were divided randomly into three groups： control group, hypoxia group and Angelica group with 4 in each group. Rats in hypoxia group and Angelica group were modeled with hypotonic hypoxia in uterus. Angelica group： Rats were injected with 8 mL/kg Angelica sinensis injection through caudal veins before hypoxia. Hypoxia group： Rats were injected with the same volume of saline. Control group： Rats were not modeled and fed with normal way. ② Twenty embryos of rats were chosen randomly from each group and then routinely embedded in paraffin. Paraffin sections were cut from the brain of embryos to anterior fontanelle. Double-label staining was used to detect the expression of nNOS and c-Fos in neurons of cerebral cortex from embryos of rats. OLYMPUS Bx-50 microscope was used to observe sections and DP12 digit camera was also used under 400 times to detect types of cells. Under microscope, the number of c-Fos, NOS, c-Fos/NOS positive neurons in cerebral cortex from embryos of rats were counted in 2 fields with magnification of 400 in one section per animal. ③ The data in experiments were analyzed by one-way analysis of variance （ANOVA） followed by q test. MAIN OUTCOME MEASURES： ① Results of immunohistochemical double-label staining of c-Fos/NOS from cerebral cortex; ② Comparison of amount immunohistochemical double-label staining of c-Fos/NOS positive cells from cerebral cortex. RESULTS：① The positive NOS cells and c-Fos/NOS cells in the three groups were mainly distributed in cerebral cortex, but positive c-Fos neurons were not observed. ② Positive NOS cells and c-Fos/NOS cells in hypoxia group were more than those in control group （76.55±12.02, 50.45±10.39; 33.35±7.42, 26.35±6.67, P 〈 0.05）, but those in Angelica group were less than those in hypoxia group （51.70±9.82, 35.65±8.37, P 〈 0.05）. CONCLUSION： Hypoxia can stimulate the increase of expression of c-Fos protein and NOS in neurons of cerebral cortex. However, Angelica sinensis can decrease this expression so as to play a protective role in cerebral neurons of hypoxic fetal rats.展开更多
Objective To investigate the development and characterizations of the hepatocytes isolated from fetal ovine and to determine the effect of hypoxia on their growth and metabolism.Methods Fresh hepatocytes were isolated...Objective To investigate the development and characterizations of the hepatocytes isolated from fetal ovine and to determine the effect of hypoxia on their growth and metabolism.Methods Fresh hepatocytes were isolated from the liver of fetal ovine at late gestation, cultured in specific media, and exposed to normoxia(21% O2) or hypoxia(2% O2).The cellular characteristics and population purity were identified by immunocytochemistry and flow cytometry(FCM).The effects of hypoxia on cell cycle and apoptosis of the hepatocytes were evaluated by FCM, whereas the cellular ultrastructure changes were examined with a transmission electron microscope.Results The cell purity of hepatocytes was over 95%.Under hypoxia exposure, the hepatocytes showed a gradual increase in proportion at the S phase and in proliferative index, followed with a compatible increase in apoptosis and progressively decreased cell viability.Additionally, the organelles of the hepatocytes demonstrated dramatic changes, including swelling of mitochondria, disorder in cristae arrangement, expansion of endoplasmic reticulum, and a large number of circular lipid droplets emerging in the cytoplasm.Conclusion Fetal ovine hepatocytes could be primarily cultured in a short-term culture system with a high purity of over 95% and with their preserved original characteristics.Hypoxia could induce changes in ultrastructural and inhibit the proliferation of cultured fetal ovine hepatocytes through apoptotic mechanisms.展开更多
Treatment and outcome of childbirth depend on the acidobasic balance of the fetal blood related to the oxygen and carbon dioxide level. Hypoxemia could lead to asphyxia that is why fetal monitoring and biochemical par...Treatment and outcome of childbirth depend on the acidobasic balance of the fetal blood related to the oxygen and carbon dioxide level. Hypoxemia could lead to asphyxia that is why fetal monitoring and biochemical parameters assessment are mandatory. Although there are compensatory mechanisms that temporarily protect the fetus, there are also other factors that interfere with the oxygenation of the fetus and determine the development of the fetus and the newborn. Actually, the level of the oxygen, the carbon dioxide, the acidobasic balance and the pH are the cornerstones of the well-being of the fetus.展开更多
目的探讨超声检查在胎儿大脑中动脉及脐动脉血流在胎儿宫内缺氧及分娩结局诊断中的应用价值。方法选取2020年8月—2022年2月广东省中山市东凤人民医院收治的孕妇60例,根据是否出现宫内缺氧分为缺氧组(31例)与正常组(29例),再根据围产儿...目的探讨超声检查在胎儿大脑中动脉及脐动脉血流在胎儿宫内缺氧及分娩结局诊断中的应用价值。方法选取2020年8月—2022年2月广东省中山市东凤人民医院收治的孕妇60例,根据是否出现宫内缺氧分为缺氧组(31例)与正常组(29例),再根据围产儿是否出现不良妊娠结局分为正常结局组(32例)与不良结局组(28例)。比较超声检查大脑中动脉(middle cerebral artery,MCA)及脐动脉(umbilical artery,UmA)血流情况,并对脉动指数(pulsatility index,PI)、阻力指数(resistance index,RI)、收缩期峰值/舒张末期流速(systolic peak value and the end-diastolic velocity of blood flow,S/D)指标。结果孕30周时正常组MCA的PI、RI、S/D高于缺氧组,UmA的PI、RI、S/D低于缺氧组(P<0.05);正常结局组MCA的PI、RI、S/D高于不良结局组,UmA的PI、RI、S/D低于不良结局组(P<0.05)。结论应用超声检查可有效诊断胎儿大脑中动脉及脐动脉血流宫内缺氧和分娩结局,为胎儿宫内缺氧情况采取早期预防措施提供可靠依据,可有效避免围产儿出现不良结局,临床上可借鉴及推广。展开更多
文摘The aim of the present study was to develop a new animal model for use in uterine torsion, uterine ischemia-reperfusion, and fetal hypoxia studies in rats. A total of 14 pregnant rats on their 18 th-19 th gestational days were used. The animals were randomly divided into two groups: those undergoing the shame operation(group 1),and those in which a 360 uterine torsion was performed using a novel technique,which was corrected 6 hours later(group 2). Subsequently, seven female and seven male rat pups aged 1 month were separated from the mothers in each group. The female rats were monitored until puberty via measuring the vaginal apertures. The 1-month old male rats and the female rats on reaching puberty were decapitated and histopathological tests were performed on the dissected organs, including the cerebral, visceral and genital organs. At the end of the study, no differences were observed between the groups with regard to abortions, offspring death rates and congenital abnormalities. It was observed that the time to reach puberty in female rats born from mothers with uterine torsion was longer, but the difference was statistically insignificant. No microscopic lesions were detected in the cerebral, visceral or genital organs of the offspring. Accordingly, it was concluded that offspring of mothers with the uterine torsion were not affected, at least in the short term. It was generally concluded that this animal model is appropriate for use in uterine torsion and ischemia-reperfusion studies, but is not appropriate for fetal hypoxia studies.
基金the Natural Science Foundation of Sichuan Educational Bureau, No. Chuanjiaoji (2001) 149-01LA40
文摘BACKGROUND： Both c-Fos protein and nitricoxide synthase （NOS） have been used as general indexes in relative research about neurons, but it is lack of reports that c-Fos protein and NOS are applied synchronously to study the neurons of hypoxic fetal rats in uterus. OBJECTIVE： To study the effect of hypoxia in uterus on the expression of c-Fos protein and NOS in neurons of cerebral cortex from fetal rats and whether Angelica sinensis has the protective effect on these neurons in hypoxia. DESIGN： Randomized control experiment.SETTING ： Department of Histology and Embryology, Luzhou Medical College.MATERIALS ： Twelve adult female Wistar rats in oestrum and 1 male Wistar rat with bodymass from 220 to 250 g were chosen. Parenteral solution of Angelica sinensis mainly contained angelica sinensis, 10 mL/ampoule, was provided by Department of Agent of the Second Hospital Affiliated to Hubei Medical University （batch number： 01062310）. METHODS ： This experiment was completed in the Department of Histology and Embryology of Luzhou Medical College from September 2003 to June 2004. ①Twelve adult female Wistar rats in oestrum and 1 male Wistar rat were housed in one rearing cage. Vaginal embolus was performed on conceive female rat at 8： 00 am next day. On the 15^th conceiving day, all conceiving rats were divided randomly into three groups： control group, hypoxia group and Angelica group with 4 in each group. Rats in hypoxia group and Angelica group were modeled with hypotonic hypoxia in uterus. Angelica group： Rats were injected with 8 mL/kg Angelica sinensis injection through caudal veins before hypoxia. Hypoxia group： Rats were injected with the same volume of saline. Control group： Rats were not modeled and fed with normal way. ② Twenty embryos of rats were chosen randomly from each group and then routinely embedded in paraffin. Paraffin sections were cut from the brain of embryos to anterior fontanelle. Double-label staining was used to detect the expression of nNOS and c-Fos in neurons of cerebral cortex from embryos of rats. OLYMPUS Bx-50 microscope was used to observe sections and DP12 digit camera was also used under 400 times to detect types of cells. Under microscope, the number of c-Fos, NOS, c-Fos/NOS positive neurons in cerebral cortex from embryos of rats were counted in 2 fields with magnification of 400 in one section per animal. ③ The data in experiments were analyzed by one-way analysis of variance （ANOVA） followed by q test. MAIN OUTCOME MEASURES： ① Results of immunohistochemical double-label staining of c-Fos/NOS from cerebral cortex; ② Comparison of amount immunohistochemical double-label staining of c-Fos/NOS positive cells from cerebral cortex. RESULTS：① The positive NOS cells and c-Fos/NOS cells in the three groups were mainly distributed in cerebral cortex, but positive c-Fos neurons were not observed. ② Positive NOS cells and c-Fos/NOS cells in hypoxia group were more than those in control group （76.55±12.02, 50.45±10.39; 33.35±7.42, 26.35±6.67, P 〈 0.05）, but those in Angelica group were less than those in hypoxia group （51.70±9.82, 35.65±8.37, P 〈 0.05）. CONCLUSION： Hypoxia can stimulate the increase of expression of c-Fos protein and NOS in neurons of cerebral cortex. However, Angelica sinensis can decrease this expression so as to play a protective role in cerebral neurons of hypoxic fetal rats.
基金funded by National Natural Science Foundation [81370719 and 81671535]Jiangsu Science Foundation [BE2015642]+3 种基金Jiangsu Key Discipline of Human Assisted Reproduction Medicine Foundation [FXK201749]Jiangsu Provincial Medical Talent of the Project of Invigorating Healthcare through Science,Technology and Education [ZDRCA2016044]and Chinese Medical Association Clinical Medicine Research Reproductive Medicine [17020270696]The Priority Academic Program Development of the Jiangsu Higher Education Institutes(PAPD)
文摘Objective To investigate the development and characterizations of the hepatocytes isolated from fetal ovine and to determine the effect of hypoxia on their growth and metabolism.Methods Fresh hepatocytes were isolated from the liver of fetal ovine at late gestation, cultured in specific media, and exposed to normoxia(21% O2) or hypoxia(2% O2).The cellular characteristics and population purity were identified by immunocytochemistry and flow cytometry(FCM).The effects of hypoxia on cell cycle and apoptosis of the hepatocytes were evaluated by FCM, whereas the cellular ultrastructure changes were examined with a transmission electron microscope.Results The cell purity of hepatocytes was over 95%.Under hypoxia exposure, the hepatocytes showed a gradual increase in proportion at the S phase and in proliferative index, followed with a compatible increase in apoptosis and progressively decreased cell viability.Additionally, the organelles of the hepatocytes demonstrated dramatic changes, including swelling of mitochondria, disorder in cristae arrangement, expansion of endoplasmic reticulum, and a large number of circular lipid droplets emerging in the cytoplasm.Conclusion Fetal ovine hepatocytes could be primarily cultured in a short-term culture system with a high purity of over 95% and with their preserved original characteristics.Hypoxia could induce changes in ultrastructural and inhibit the proliferation of cultured fetal ovine hepatocytes through apoptotic mechanisms.
文摘Treatment and outcome of childbirth depend on the acidobasic balance of the fetal blood related to the oxygen and carbon dioxide level. Hypoxemia could lead to asphyxia that is why fetal monitoring and biochemical parameters assessment are mandatory. Although there are compensatory mechanisms that temporarily protect the fetus, there are also other factors that interfere with the oxygenation of the fetus and determine the development of the fetus and the newborn. Actually, the level of the oxygen, the carbon dioxide, the acidobasic balance and the pH are the cornerstones of the well-being of the fetus.
文摘目的探讨超声检查在胎儿大脑中动脉及脐动脉血流在胎儿宫内缺氧及分娩结局诊断中的应用价值。方法选取2020年8月—2022年2月广东省中山市东凤人民医院收治的孕妇60例,根据是否出现宫内缺氧分为缺氧组(31例)与正常组(29例),再根据围产儿是否出现不良妊娠结局分为正常结局组(32例)与不良结局组(28例)。比较超声检查大脑中动脉(middle cerebral artery,MCA)及脐动脉(umbilical artery,UmA)血流情况,并对脉动指数(pulsatility index,PI)、阻力指数(resistance index,RI)、收缩期峰值/舒张末期流速(systolic peak value and the end-diastolic velocity of blood flow,S/D)指标。结果孕30周时正常组MCA的PI、RI、S/D高于缺氧组,UmA的PI、RI、S/D低于缺氧组(P<0.05);正常结局组MCA的PI、RI、S/D高于不良结局组,UmA的PI、RI、S/D低于不良结局组(P<0.05)。结论应用超声检查可有效诊断胎儿大脑中动脉及脐动脉血流宫内缺氧和分娩结局,为胎儿宫内缺氧情况采取早期预防措施提供可靠依据,可有效避免围产儿出现不良结局,临床上可借鉴及推广。
