Male infertility has evolved from a common reproductive system disease to a major social issue.Youjing granule(YG)is a Chinese medicinal material used as a therapy method for tonifying the kidneys and removing dampnes...Male infertility has evolved from a common reproductive system disease to a major social issue.Youjing granule(YG)is a Chinese medicinal material used as a therapy method for tonifying the kidneys and removing dampness due to its pathogenic characteristics.YG has been shown to regulate sperm quality in clinical trials,but the underlying mechanism is not fully understood.The present study was aimed to explore the protective effects and mechanism of action of YG on male reproductive system damage caused by methyl methane sulfonate(MMS).We first established an infertility model of rats through oral administration of MMS and then treated with YG.To determine the effect of YG,spermatogenesis,microvascular density,and secretory function of Leydig cells and Sertoli cells in rats were assessed.Spermatogonial stem cells(SSCs)were co-cultured with mouse embryo fibroblast(MEF)cells as an in vitro cell model before exposure to serum containing YG.Furthermore,the proliferation and apoptosis of SSCs were measured.Results indicated that YG increased the expression of self-renewal and proliferation-related molecules such as glial cell line derived neurotrophic factor(GDNF)and fibroblast growth factor-2(FGF2),and improved the quality of sperm and the proliferation of SSCs.In conclusion,YG may protect spermatogenetic function of rats through regulating the proliferation and self-renewal of SSCs.展开更多
The vibration of a single protein bubble may take place under the action of high pressure difference. In this process, the bubble wall may experience a finite deformation. The equation describing the dynamics of the p...The vibration of a single protein bubble may take place under the action of high pressure difference. In this process, the bubble wall may experience a finite deformation. The equation describing the dynamics of the protein bubble with viscoelastic film in Bingham liquid is derived. A numerical solution to this equation is carried out to study the effect of liquid pressure, the characteristic parameters of Bingham liquid and the viscosity of the protein film on the finite deformation of the bubble. The results show that the vibration of the protein bubble wall is caused by the action of pressure difference, the elastic stress in finite deformation and the dissipation of viscosity of the protein film and Bingham liquid. The vibration is nonlinear. Decreasing the pressure difference between gas and Bingham liquid on both sides of the protein bubble will lead to a change of vibration performance. The frequency and amplitude are reduced, tegether with the speed of vibration damping. In addition, the deformation rate of the bubble is smaller when the amplitude of vibration is reduced, which means shorter time to reach a balance state. On the other side, the increase of the magnitude of viscosity of the protein film or the plastic viscosity of Bingham liquid can restrain the vibration of the protein bubble wall in the course of finite deformation, as a result, the load bearing capacity of bubble is enhanced.展开更多
基金supported by the National Natural Science Foundation of China(No.81774314)the Foundation of Clinical Science and Technology of Wuxi(No.Q202059)+1 种基金the Top Talent Support Program for Young and Middle-Aged People of Wuxi Health Committee(Nos.BJ2020105 and HB2020108)the Clinical Medical Science and Technology Development Foundation of Jiangsu University(No.JYL20180068)。
文摘Male infertility has evolved from a common reproductive system disease to a major social issue.Youjing granule(YG)is a Chinese medicinal material used as a therapy method for tonifying the kidneys and removing dampness due to its pathogenic characteristics.YG has been shown to regulate sperm quality in clinical trials,but the underlying mechanism is not fully understood.The present study was aimed to explore the protective effects and mechanism of action of YG on male reproductive system damage caused by methyl methane sulfonate(MMS).We first established an infertility model of rats through oral administration of MMS and then treated with YG.To determine the effect of YG,spermatogenesis,microvascular density,and secretory function of Leydig cells and Sertoli cells in rats were assessed.Spermatogonial stem cells(SSCs)were co-cultured with mouse embryo fibroblast(MEF)cells as an in vitro cell model before exposure to serum containing YG.Furthermore,the proliferation and apoptosis of SSCs were measured.Results indicated that YG increased the expression of self-renewal and proliferation-related molecules such as glial cell line derived neurotrophic factor(GDNF)and fibroblast growth factor-2(FGF2),and improved the quality of sperm and the proliferation of SSCs.In conclusion,YG may protect spermatogenetic function of rats through regulating the proliferation and self-renewal of SSCs.
基金supported by the Leading Academic Disciplin Project of Shanghai Municipal Education Commission (Gran No.J50501)
文摘The vibration of a single protein bubble may take place under the action of high pressure difference. In this process, the bubble wall may experience a finite deformation. The equation describing the dynamics of the protein bubble with viscoelastic film in Bingham liquid is derived. A numerical solution to this equation is carried out to study the effect of liquid pressure, the characteristic parameters of Bingham liquid and the viscosity of the protein film on the finite deformation of the bubble. The results show that the vibration of the protein bubble wall is caused by the action of pressure difference, the elastic stress in finite deformation and the dissipation of viscosity of the protein film and Bingham liquid. The vibration is nonlinear. Decreasing the pressure difference between gas and Bingham liquid on both sides of the protein bubble will lead to a change of vibration performance. The frequency and amplitude are reduced, tegether with the speed of vibration damping. In addition, the deformation rate of the bubble is smaller when the amplitude of vibration is reduced, which means shorter time to reach a balance state. On the other side, the increase of the magnitude of viscosity of the protein film or the plastic viscosity of Bingham liquid can restrain the vibration of the protein bubble wall in the course of finite deformation, as a result, the load bearing capacity of bubble is enhanced.
