Rationale:This case report describes a couple with recurrent fertilization failure despite undergoing multiple cycles of intracytoplasmic sperm injection(ICSI).The principal clinical concern was suspected oocyte activ...Rationale:This case report describes a couple with recurrent fertilization failure despite undergoing multiple cycles of intracytoplasmic sperm injection(ICSI).The principal clinical concern was suspected oocyte activation deficiency(OAD),in which fertilization is impeded due to the oocyte’s inability to initiate embryogenesis,commonly attributed to inadequate intracellular calcium(Ca^(2+))release following sperm injection.Patient concerns:The couple repeatedly experienced complete or near-complete fertilization failure in previous ICSI cycles,raising suspicion of an underlying oocyte activation defect.Diagnosis:Based on the repeated absence of fertilization post-ICSI and clinical history,a diagnosis of suspected OAD leading to recurrent ICSI fertilization failure was considered.Interventions:Artificial oocyte activation(AOA)using the calcium ionophore A23187 was performed.After ICSI,unfertilized oocytes were exposed to the ionophore to induce Ca^(2+)influx,simulating physiological calcium oscillations essential for oocyte activation.The efficacy of intervention was evaluated through subsequent embryonic development,morphological grading,and chromosomal integrity.Outcomes:Following AOA treatment,successful oocyte activation occurred,resulting in the formation of high-grade embryos with normal developmental progression.Chromosomal analysis revealed no detectable abnormalities,indicating genomic stability.Lessons:Calcium ionophore–mediated AOA may serve as an effective adjunct in cases of recurrent ICSI failure attributed to OAD.This case highlights the importance of individualized therapeutic strategies in assisted reproduction;however,further research is needed to refine protocols,validate broader clinical efficacy,and assess long-term safety,including potential epigenetic risks.展开更多
目的:研究孕酮与钙离子载体A23187诱导顶体反应(Acrosom e reaction,AR)特征。方法:10例健康生育男性精液,采用Percoll密度梯度分离法优选精子,采用FITC-PSA荧光染色法分析AR。结果:A23187诱导AR类型主要为III型和IV型,孕酮诱导AR类型...目的:研究孕酮与钙离子载体A23187诱导顶体反应(Acrosom e reaction,AR)特征。方法:10例健康生育男性精液,采用Percoll密度梯度分离法优选精子,采用FITC-PSA荧光染色法分析AR。结果:A23187诱导AR类型主要为III型和IV型,孕酮诱导AR类型主要为II型。精子获能4、6、8和16 h时,A23187和孕酮诱导AR率与获能0 h组相比较,均明显增加,两组比较差异均有显著性(P<0.05),同一获能时间A 23187和孕酮诱导的AR率比较,差异均无显著性(P>0.05)。A23187诱导15 m in、30 m in和60 m in时,AR率均明显高于诱导前AR率(P<0.005)。孕酮诱导15 m in时,AR率与诱导前组比较没有明显差异(P>0.05),孕酮诱导30 m in和60 m in时,AR率均明显高于诱导前组(P<0.005),同一诱导时间,A23187诱导AR率均明显高于孕酮诱导的AR率,差异均有显著性(P<0.05)。结论:孕酮可诱导精子发生AR,诱导AR类型主要为II型,可比A23187诱导的AR更接近生理过程。展开更多
The aim of the study was to prepare berberine hydrochloride long-circulating liposomes and optimize the formulation and process parameters,and investigate the influence of different factors on the encapsulation effici...The aim of the study was to prepare berberine hydrochloride long-circulating liposomes and optimize the formulation and process parameters,and investigate the influence of different factors on the encapsulation efficiency.Berberine hydrochloride liposomes were prepared in response to a transmembrane ion gradient that was established by ionophore A23187.Free and liposomal drug were separated by cation exchange resin,and then the amount of intraliposomal berberine hydrochloride was determined by UV spectrophotometry.The optimized encapsulation efficiency of berberine hydrochloride liposomes was 94.3%2.1%when the drug-to-lipid ratio was 1:20,and the mean diameter was 146.9 nm3.2 nm.As a result,the ionophore A23187-mediated ZnSO_(4)gradient method was suitable for the preparation of berberine hydrochloride liposomes that we could get the desired encapsulation efficiency and drug loading.展开更多
Effects of procainamide (PA) on human platelet aggregation and the cytosolic free-Ca2+ concentration ([Ca2+]) were investigated in vitro. PA at doses of 8.5 , 34 and 136 μmol·L-1 could inhibit the human platelet...Effects of procainamide (PA) on human platelet aggregation and the cytosolic free-Ca2+ concentration ([Ca2+]) were investigated in vitro. PA at doses of 8.5 , 34 and 136 μmol·L-1 could inhibit the human platelet aggregation induced by 0. 5 μmol · L-1 A23187 with a good concentration -effect relationship. One min and maximal aggregation rates were also inhibited ( P<0. 01 ,vs control). The [Ca2+], was decreased in the presence of PA ,and the changes of [Ca2+], showed a significant linear correlation with 1 min or maximal aggregation rate (P<0.05). These results suggest that the mechanisms of PA inhibiting platelet aggregation relate to the decrease of [Ca2+].展开更多
文摘Rationale:This case report describes a couple with recurrent fertilization failure despite undergoing multiple cycles of intracytoplasmic sperm injection(ICSI).The principal clinical concern was suspected oocyte activation deficiency(OAD),in which fertilization is impeded due to the oocyte’s inability to initiate embryogenesis,commonly attributed to inadequate intracellular calcium(Ca^(2+))release following sperm injection.Patient concerns:The couple repeatedly experienced complete or near-complete fertilization failure in previous ICSI cycles,raising suspicion of an underlying oocyte activation defect.Diagnosis:Based on the repeated absence of fertilization post-ICSI and clinical history,a diagnosis of suspected OAD leading to recurrent ICSI fertilization failure was considered.Interventions:Artificial oocyte activation(AOA)using the calcium ionophore A23187 was performed.After ICSI,unfertilized oocytes were exposed to the ionophore to induce Ca^(2+)influx,simulating physiological calcium oscillations essential for oocyte activation.The efficacy of intervention was evaluated through subsequent embryonic development,morphological grading,and chromosomal integrity.Outcomes:Following AOA treatment,successful oocyte activation occurred,resulting in the formation of high-grade embryos with normal developmental progression.Chromosomal analysis revealed no detectable abnormalities,indicating genomic stability.Lessons:Calcium ionophore–mediated AOA may serve as an effective adjunct in cases of recurrent ICSI failure attributed to OAD.This case highlights the importance of individualized therapeutic strategies in assisted reproduction;however,further research is needed to refine protocols,validate broader clinical efficacy,and assess long-term safety,including potential epigenetic risks.
文摘目的:研究孕酮与钙离子载体A23187诱导顶体反应(Acrosom e reaction,AR)特征。方法:10例健康生育男性精液,采用Percoll密度梯度分离法优选精子,采用FITC-PSA荧光染色法分析AR。结果:A23187诱导AR类型主要为III型和IV型,孕酮诱导AR类型主要为II型。精子获能4、6、8和16 h时,A23187和孕酮诱导AR率与获能0 h组相比较,均明显增加,两组比较差异均有显著性(P<0.05),同一获能时间A 23187和孕酮诱导的AR率比较,差异均无显著性(P>0.05)。A23187诱导15 m in、30 m in和60 m in时,AR率均明显高于诱导前AR率(P<0.005)。孕酮诱导15 m in时,AR率与诱导前组比较没有明显差异(P>0.05),孕酮诱导30 m in和60 m in时,AR率均明显高于诱导前组(P<0.005),同一诱导时间,A23187诱导AR率均明显高于孕酮诱导的AR率,差异均有显著性(P<0.05)。结论:孕酮可诱导精子发生AR,诱导AR类型主要为II型,可比A23187诱导的AR更接近生理过程。
文摘The aim of the study was to prepare berberine hydrochloride long-circulating liposomes and optimize the formulation and process parameters,and investigate the influence of different factors on the encapsulation efficiency.Berberine hydrochloride liposomes were prepared in response to a transmembrane ion gradient that was established by ionophore A23187.Free and liposomal drug were separated by cation exchange resin,and then the amount of intraliposomal berberine hydrochloride was determined by UV spectrophotometry.The optimized encapsulation efficiency of berberine hydrochloride liposomes was 94.3%2.1%when the drug-to-lipid ratio was 1:20,and the mean diameter was 146.9 nm3.2 nm.As a result,the ionophore A23187-mediated ZnSO_(4)gradient method was suitable for the preparation of berberine hydrochloride liposomes that we could get the desired encapsulation efficiency and drug loading.
文摘Effects of procainamide (PA) on human platelet aggregation and the cytosolic free-Ca2+ concentration ([Ca2+]) were investigated in vitro. PA at doses of 8.5 , 34 and 136 μmol·L-1 could inhibit the human platelet aggregation induced by 0. 5 μmol · L-1 A23187 with a good concentration -effect relationship. One min and maximal aggregation rates were also inhibited ( P<0. 01 ,vs control). The [Ca2+], was decreased in the presence of PA ,and the changes of [Ca2+], showed a significant linear correlation with 1 min or maximal aggregation rate (P<0.05). These results suggest that the mechanisms of PA inhibiting platelet aggregation relate to the decrease of [Ca2+].
