Background:Recently,defects in mammalian oocytes maturation induced by environmental pollution results in the decreasing animal reproduction.Animal exposed to glyphosate is largely unavoidable because glyphosate is on...Background:Recently,defects in mammalian oocytes maturation induced by environmental pollution results in the decreasing animal reproduction.Animal exposed to glyphosate is largely unavoidable because glyphosate is one of the most widely used herbicide worldwide due to its high-efficiency and broad-spectrum effects,which causes glyphosate an environmental contaminant found in soil,water and food.During the last few years,the growing and wider use of glyphosate has raised great concerns about its effects of reproductive toxicity.In this study,using porcine models,we investigated effects of glyphosate on organelle functions during oocyte meiosis.Results:The results showed glyphosate exposure disrupted porcine oocyte maturation.Expression levels of cumulus expansion-related genes were interfered,further indicating the meiotic defects.The damaging effects were mediated by destruction of mitochondrial distribution and functions,which induced ROS accumulation and oxidative stress,also indicated by the decreased mRNA expression of related antioxidant enzyme genes.We also found an interference of endoplasmic reticulum(ER)distribution,disturbance of Ca^(2+)homeostasis,as well as fluctuation of ER stress,showing with the reduced ER stress-related mRNA or protein expression,which could indicate the dysfunction of ER for protein processing and signal transduction in glyphosate-exposed oocytes.Moreover,glyphosate exposure induced the disruption of lysosome function for autophagy,showing with the decrease of LAMP2 expression and autophagy-related genes mRNA expression.Additionally,our data showed the distribution of Golgi apparatus and the functions of ribosome were disturbed after glyphosate exposure,which might affect protein synthesis and transport.Conclusions:Collectively,our study showed that exposed to glyphosate could affect animal reproduction by compromising the quality of oocytes through its wide toxic effects on organelle functions.展开更多
Background: Environmental pollution induces oxidative stress and apoptosis in mammalian oocytes, which can cause defects in reproduction;however, the molecular regulation of oxidative stress in oocytes is still largel...Background: Environmental pollution induces oxidative stress and apoptosis in mammalian oocytes, which can cause defects in reproduction;however, the molecular regulation of oxidative stress in oocytes is still largely unknown. In the present study, we identified that dynamin-related protein 1(DRP1) is an important molecule regulating oocyte mitochondrial function and preventing oxidative stress/apoptosis. DRP1 is a member of the dynamin GTPase superfamily localized at the mitochondrial-endoplasmic reticulum interaction site, where it regulates the fission of mitochondria and other related cellular processes.Results: Our results show that DRP1 was stably expressed during different stages of porcine oocyte meiosis, and might have a potential relationship with mitochondria as it exhibited similar localization. Loss of DRP1 activity caused failed porcine oocyte maturation and cumulus cell expansion, as well as defects in polar body extrusion.Further analysis indicated that a DRP1 deficiency caused mitochondrial dysfunction and induced oxidative stress,which was confirmed by increased reactive oxygen species levels. Moreover, the incidence of early apoptosis increased as detected by positive Annexin-V signaling.Conclusions: Taken together, our results indicate that DRP1 is essential for porcine oocyte maturation and that a DRP1 deficiency could induce mitochondrial dysfunction, oxidative stress, and apoptosis.展开更多
Aluminum(Al)can lead to an exposure of creature in varieties ways for its universality,and it could disturb normal physiological metabolism,with the damage to multisystem including reproduction.Since the oocyte qualit...Aluminum(Al)can lead to an exposure of creature in varieties ways for its universality,and it could disturb normal physiological metabolism,with the damage to multisystem including reproduction.Since the oocyte quality is critical for female reproduction,we inspected the toxicity of Al on mouse oocyte maturation.We constructed in vitro exposure mouse model,and we found that 5 mmol/L Al had adverse effects on oocyte maturation by impairing organelle and cytoskeleton.Aberrant spindle and misaligned chromosomes which might be considered to be caused by elevated levels of acetylation,as well as abnormal distribution of actin dynamics could hinder normal meiosis of oocytes.Organelle dysfunction indicated that Al affected proteins synthesis,transport and digestion,which would further damage oocyte maturation.In order to explore the mechanism of Al toxicity,our further investigation demonstrated that Al caused mitochondrial dysfunction and imbalance calcium homeostasis,resulting in limited energy supply.Moreover,high level of reactive oxygen species,DNA damage and apoptosis caused by oxidative stress were also the manifestation of Al toxicity on oocytes.In conclusion,our study provided the evidence that Al exposure affected oocyte quality through its effects on spindle organization,actin dynamics,organelle function and the induction of DNA damage-related apoptosis with mouse model.展开更多
The resistance characteristics of a corrugated flame arrester in hydrogen explosions were investigated using a visual explosion-retardant system.By varying the structural parameters of the corrugated flame-retardant s...The resistance characteristics of a corrugated flame arrester in hydrogen explosions were investigated using a visual explosion-retardant system.By varying the structural parameters of the corrugated flame-retardant system and the concentration of hydrogen,the flame resistance characteristics and the mechanisms affecting hydrogen explosions were summarized.The results indicate that there was a clear correlation between the flame propagation and pressure rise during explosion resistance.When the flame resistance failed,a significant enhancement effect was observed at the backend of the flame-retardant system.Additionally,a noticeable oscillation occurred in the initial stage of flame propagation due to the obstruction caused by the flame-retardant system.The thickness and porosity of the flame-retardant system,along with the hydrogen concentration,influenced the intensities of shock waves and flames entering the narrow channel,as well as the physical and chemical effects during internal propagation,thereby affecting the overall flame resistance.展开更多
基金supported by the Fundamental Research Funds for the Central Universities(KYCXJC2022001,KYYZ202102)the National Natural Science Foundation of China(32170857).
文摘Background:Recently,defects in mammalian oocytes maturation induced by environmental pollution results in the decreasing animal reproduction.Animal exposed to glyphosate is largely unavoidable because glyphosate is one of the most widely used herbicide worldwide due to its high-efficiency and broad-spectrum effects,which causes glyphosate an environmental contaminant found in soil,water and food.During the last few years,the growing and wider use of glyphosate has raised great concerns about its effects of reproductive toxicity.In this study,using porcine models,we investigated effects of glyphosate on organelle functions during oocyte meiosis.Results:The results showed glyphosate exposure disrupted porcine oocyte maturation.Expression levels of cumulus expansion-related genes were interfered,further indicating the meiotic defects.The damaging effects were mediated by destruction of mitochondrial distribution and functions,which induced ROS accumulation and oxidative stress,also indicated by the decreased mRNA expression of related antioxidant enzyme genes.We also found an interference of endoplasmic reticulum(ER)distribution,disturbance of Ca^(2+)homeostasis,as well as fluctuation of ER stress,showing with the reduced ER stress-related mRNA or protein expression,which could indicate the dysfunction of ER for protein processing and signal transduction in glyphosate-exposed oocytes.Moreover,glyphosate exposure induced the disruption of lysosome function for autophagy,showing with the decrease of LAMP2 expression and autophagy-related genes mRNA expression.Additionally,our data showed the distribution of Golgi apparatus and the functions of ribosome were disturbed after glyphosate exposure,which might affect protein synthesis and transport.Conclusions:Collectively,our study showed that exposed to glyphosate could affect animal reproduction by compromising the quality of oocytes through its wide toxic effects on organelle functions.
基金supported by the National Key Research and Development Program (2018YFC1003802, 2018YFC1004003)。
文摘Background: Environmental pollution induces oxidative stress and apoptosis in mammalian oocytes, which can cause defects in reproduction;however, the molecular regulation of oxidative stress in oocytes is still largely unknown. In the present study, we identified that dynamin-related protein 1(DRP1) is an important molecule regulating oocyte mitochondrial function and preventing oxidative stress/apoptosis. DRP1 is a member of the dynamin GTPase superfamily localized at the mitochondrial-endoplasmic reticulum interaction site, where it regulates the fission of mitochondria and other related cellular processes.Results: Our results show that DRP1 was stably expressed during different stages of porcine oocyte meiosis, and might have a potential relationship with mitochondria as it exhibited similar localization. Loss of DRP1 activity caused failed porcine oocyte maturation and cumulus cell expansion, as well as defects in polar body extrusion.Further analysis indicated that a DRP1 deficiency caused mitochondrial dysfunction and induced oxidative stress,which was confirmed by increased reactive oxygen species levels. Moreover, the incidence of early apoptosis increased as detected by positive Annexin-V signaling.Conclusions: Taken together, our results indicate that DRP1 is essential for porcine oocyte maturation and that a DRP1 deficiency could induce mitochondrial dysfunction, oxidative stress, and apoptosis.
基金supported by the Natural Science Foundation of Guangxi in China(No.2021GXNSFDA220001)Baise Engineering Technology Research Center(No.20212210)2022 Scientific Research and Technological Development Foundation of Baise in China(No.20221403)。
文摘Aluminum(Al)can lead to an exposure of creature in varieties ways for its universality,and it could disturb normal physiological metabolism,with the damage to multisystem including reproduction.Since the oocyte quality is critical for female reproduction,we inspected the toxicity of Al on mouse oocyte maturation.We constructed in vitro exposure mouse model,and we found that 5 mmol/L Al had adverse effects on oocyte maturation by impairing organelle and cytoskeleton.Aberrant spindle and misaligned chromosomes which might be considered to be caused by elevated levels of acetylation,as well as abnormal distribution of actin dynamics could hinder normal meiosis of oocytes.Organelle dysfunction indicated that Al affected proteins synthesis,transport and digestion,which would further damage oocyte maturation.In order to explore the mechanism of Al toxicity,our further investigation demonstrated that Al caused mitochondrial dysfunction and imbalance calcium homeostasis,resulting in limited energy supply.Moreover,high level of reactive oxygen species,DNA damage and apoptosis caused by oxidative stress were also the manifestation of Al toxicity on oocytes.In conclusion,our study provided the evidence that Al exposure affected oocyte quality through its effects on spindle organization,actin dynamics,organelle function and the induction of DNA damage-related apoptosis with mouse model.
文摘The resistance characteristics of a corrugated flame arrester in hydrogen explosions were investigated using a visual explosion-retardant system.By varying the structural parameters of the corrugated flame-retardant system and the concentration of hydrogen,the flame resistance characteristics and the mechanisms affecting hydrogen explosions were summarized.The results indicate that there was a clear correlation between the flame propagation and pressure rise during explosion resistance.When the flame resistance failed,a significant enhancement effect was observed at the backend of the flame-retardant system.Additionally,a noticeable oscillation occurred in the initial stage of flame propagation due to the obstruction caused by the flame-retardant system.The thickness and porosity of the flame-retardant system,along with the hydrogen concentration,influenced the intensities of shock waves and flames entering the narrow channel,as well as the physical and chemical effects during internal propagation,thereby affecting the overall flame resistance.
