Objective The aim of this study was to explore the role and mechanism of ferroptosis in SiO_(2)-induced cardiac injury using a mouse model.Methods Male C57BL/6 mice were intratracheally instilled with SiO_(2) to creat...Objective The aim of this study was to explore the role and mechanism of ferroptosis in SiO_(2)-induced cardiac injury using a mouse model.Methods Male C57BL/6 mice were intratracheally instilled with SiO_(2) to create a silicosis model.Ferrostatin-1(Fer-1)and deferoxamine(DFO)were used to suppress ferroptosis.Serum biomarkers,oxidative stress markers,histopathology,iron content,and the expression of ferroptosis-related proteins were assessed.Results SiO_(2) altered serum cardiac injury biomarkers,oxidative stress,iron accumulation,and ferroptosis markers in myocardial tissue.Fer-1 and DFO reduced lipid peroxidation and iron overload,and alleviated SiO_(2)-induced mitochondrial damage and myocardial injury.SiO_(2) inhibited Nuclear factor erythroid 2-related factor 2(Nrf2)and its downstream antioxidant genes,while Fer-1 more potently reactivated Nrf2 compared to DFO.Conclusion Iron overload-induced ferroptosis contributes to SiO_(2)-induced cardiac injury.Targeting ferroptosis by reducing iron accumulation or inhibiting lipid peroxidation protects against SiO_(2) cardiotoxicity,potentially via modulation of the Nrf2 pathway.展开更多
Aim: To observe effects of angiotensin (Ang) II receptor antagonist (ATI) irbesartan and angiotensin-converting enzyme (ACE) inhibitor perindopril on rat myocardium calcineurin expression and sarcoplasmic retic...Aim: To observe effects of angiotensin (Ang) II receptor antagonist (ATI) irbesartan and angiotensin-converting enzyme (ACE) inhibitor perindopril on rat myocardium calcineurin expression and sarcoplasmic reticulum Ca^2+-ATPase activity in the model of pressure-overload cardiac hypertrophy. Methods: Forty male adult Sprague Dawley rats were divided into 5 groups One group was treated by sham operation; four groups were myocardium hypertrophy cases caused by banding aortic above renal artery. Drugs were given one week after operation. Group 1: sham group, rats (n=8) were gavaged with normal saline 2 ml/(kg·d) (ig); Group 2: control group, rats (n=8) were treated with normal saline 2 ml/(kg·d) (ig); Group 3: rats (n=8) were given perindopril 2 mg/(kg·d) (ig); Group 4: rats (n=8) were treated with irbesartan 20 mg/(kg·d) (ig); Group 5: rats (n=8) were given irbesartan 20 mg/(kg·d) plus perindopril 2 mg/(kg·d) (ig). Morphometric determination, calcineurin expression and sarcoplasmic reticulum Ca^2+-ATPase activity were done at the end of 6 week of drug intervention. Expression of calcineurin in myocardium was detected by immunohistochemistry. Results: Left ventricular mass index (LVMI), transverse diameter of myocardial cell (TDM), calcineurin activity were remarkably decreased after drug intervention and this decrease was most remarkable in the combination drug therapy group. Sarcoplasmic reticulum Ca^2+-ATPase activity was increased after drug intervention, especially in the combined drug therapy group. Calcineurin expression in myocardium was remarkably decreased after drug intervention. LVMI was positively correlated with TDM and calcineurin, negatively correlated with sarcoplasmic reticulum Ca^2+-ATPase. Conclusion: These data suggest that irbesartan and perindopril inhibit cardiac hypertrophy through the increased activity of sarcoplasmic reticulum Ca^2+-ATPase and decreased expression of calcineurin. Their combination had better effects on regressing of ventricular hypertrophy.展开更多
Inhibitors are important for flotation separation of quartz and feldspar.In this study,a novel combined inhibitor was used to separate quartz and feldspar in near-neutral pulp.Selective inhibition of the combined inhi...Inhibitors are important for flotation separation of quartz and feldspar.In this study,a novel combined inhibitor was used to separate quartz and feldspar in near-neutral pulp.Selective inhibition of the combined inhibitor was assessed by micro-flotation experiments.And a series of detection methods were used to detect differences in the surface properties of feldspars and quartz after flotation reagents and put forward the synergistic strengthening mechanism.The outcomes were pointed out that pre-mixing combined inhibitors were more effective than the addition of Ca^(2+)and SS in sequence under the optimal proportion of 1:5.A concentrate from artificial mixed minerals that was characterized by a high quartz grade and a high recovery was acquired,and was found to be 90.70wt% and 83.70%,respectively.It was demonstrated that the combined inhibitor selectively prevented the action of the collector and feldspar from Fourier-transform infrared(FT-IR)and adsorption capacity tests.The results of X-ray photoelectron spectroscopy(XPS)indicated that Ca^(2+)directly interacts with the surface of quartz to increase the adsorption of collectors.In contrast,the chemistry property of Al on the feldspar surface was altered by combined inhibitor due to Na^(+)and Ca^(2+)taking the place of K^(+),resulting in the composite inhibitor forms a hydrophilic structure,which prevents the adsorption of the collector on the surface of feldspar by interacting with the Al active site.The combination of Ca^(2+)and SS synergically strengthens the difference of collecting property between quartz and feldspar by collector,thus achieving the effect of efficient separation.A new strategy for flotation to separate quartz from feldspar in near-neutral pulp was provided.展开更多
in hippocampal neurons is an important contributor to depression. [Ca^2+]i of hippocampal neurons may raise rapidly with increased corticosterone concentrations, leading to apoptosis. The anti-depressant effects of X...in hippocampal neurons is an important contributor to depression. [Ca^2+]i of hippocampal neurons may raise rapidly with increased corticosterone concentrations, leading to apoptosis. The anti-depressant effects of Xiaoyaosan (Free and Easy Wanderer's Powder) may inhibit apoptosis by down regulating the [Ca^2+]i overload. PC12 cells were containing with corticosterone to simulate neuronal injury, dosed with Xiaoyaosan-containing serum, and the following parameters were measured: apoptosis,[Ca^2+]i overload, and changes in mitochondrial membrane potential (△ψm) and bioenergetics. High-dose Xiaoyaosan-containing serum (the dose of intragastric administration was 2.633 g herb/mL) not only inhibited morphological injury and cell apoptosis, but also suppressed [Ca^2+]i overload induced by corticosterone. Xiaoyaosan also blocked the decrease in mitochondrial membrane potential and adenosine triphosphate levels induced by corticosterone. Xiaoyaosan dose-dependently suppresses corticosterone-induced apoptosis, potentially via inhibiting [Ca^2+]ioverload, and prevents impaired mitochondrial bioenergetics by maintaining mitochondrial membrane potential and adenosine triphosphate production, providing a putative mechanism for its antidepressant effects.展开更多
基金supported by the National Natural Science Foundation of China[No.U21A20334,82373544]Hebei Provincial Department of Science and Technology Centrally Guided Local Development Fund Project[236Z7705G]Occupational health risk assessment and the formulation of national occupational health standards[102393220020090000020].
文摘Objective The aim of this study was to explore the role and mechanism of ferroptosis in SiO_(2)-induced cardiac injury using a mouse model.Methods Male C57BL/6 mice were intratracheally instilled with SiO_(2) to create a silicosis model.Ferrostatin-1(Fer-1)and deferoxamine(DFO)were used to suppress ferroptosis.Serum biomarkers,oxidative stress markers,histopathology,iron content,and the expression of ferroptosis-related proteins were assessed.Results SiO_(2) altered serum cardiac injury biomarkers,oxidative stress,iron accumulation,and ferroptosis markers in myocardial tissue.Fer-1 and DFO reduced lipid peroxidation and iron overload,and alleviated SiO_(2)-induced mitochondrial damage and myocardial injury.SiO_(2) inhibited Nuclear factor erythroid 2-related factor 2(Nrf2)and its downstream antioxidant genes,while Fer-1 more potently reactivated Nrf2 compared to DFO.Conclusion Iron overload-induced ferroptosis contributes to SiO_(2)-induced cardiac injury.Targeting ferroptosis by reducing iron accumulation or inhibiting lipid peroxidation protects against SiO_(2) cardiotoxicity,potentially via modulation of the Nrf2 pathway.
文摘Aim: To observe effects of angiotensin (Ang) II receptor antagonist (ATI) irbesartan and angiotensin-converting enzyme (ACE) inhibitor perindopril on rat myocardium calcineurin expression and sarcoplasmic reticulum Ca^2+-ATPase activity in the model of pressure-overload cardiac hypertrophy. Methods: Forty male adult Sprague Dawley rats were divided into 5 groups One group was treated by sham operation; four groups were myocardium hypertrophy cases caused by banding aortic above renal artery. Drugs were given one week after operation. Group 1: sham group, rats (n=8) were gavaged with normal saline 2 ml/(kg·d) (ig); Group 2: control group, rats (n=8) were treated with normal saline 2 ml/(kg·d) (ig); Group 3: rats (n=8) were given perindopril 2 mg/(kg·d) (ig); Group 4: rats (n=8) were treated with irbesartan 20 mg/(kg·d) (ig); Group 5: rats (n=8) were given irbesartan 20 mg/(kg·d) plus perindopril 2 mg/(kg·d) (ig). Morphometric determination, calcineurin expression and sarcoplasmic reticulum Ca^2+-ATPase activity were done at the end of 6 week of drug intervention. Expression of calcineurin in myocardium was detected by immunohistochemistry. Results: Left ventricular mass index (LVMI), transverse diameter of myocardial cell (TDM), calcineurin activity were remarkably decreased after drug intervention and this decrease was most remarkable in the combination drug therapy group. Sarcoplasmic reticulum Ca^2+-ATPase activity was increased after drug intervention, especially in the combined drug therapy group. Calcineurin expression in myocardium was remarkably decreased after drug intervention. LVMI was positively correlated with TDM and calcineurin, negatively correlated with sarcoplasmic reticulum Ca^2+-ATPase. Conclusion: These data suggest that irbesartan and perindopril inhibit cardiac hypertrophy through the increased activity of sarcoplasmic reticulum Ca^2+-ATPase and decreased expression of calcineurin. Their combination had better effects on regressing of ventricular hypertrophy.
基金the financial support from the National Key Research and Development Program of China(No.2018YFC1903403)Young Elite Scientists Sponsorship Program by CAST(No.2022QNRC001).
文摘Inhibitors are important for flotation separation of quartz and feldspar.In this study,a novel combined inhibitor was used to separate quartz and feldspar in near-neutral pulp.Selective inhibition of the combined inhibitor was assessed by micro-flotation experiments.And a series of detection methods were used to detect differences in the surface properties of feldspars and quartz after flotation reagents and put forward the synergistic strengthening mechanism.The outcomes were pointed out that pre-mixing combined inhibitors were more effective than the addition of Ca^(2+)and SS in sequence under the optimal proportion of 1:5.A concentrate from artificial mixed minerals that was characterized by a high quartz grade and a high recovery was acquired,and was found to be 90.70wt% and 83.70%,respectively.It was demonstrated that the combined inhibitor selectively prevented the action of the collector and feldspar from Fourier-transform infrared(FT-IR)and adsorption capacity tests.The results of X-ray photoelectron spectroscopy(XPS)indicated that Ca^(2+)directly interacts with the surface of quartz to increase the adsorption of collectors.In contrast,the chemistry property of Al on the feldspar surface was altered by combined inhibitor due to Na^(+)and Ca^(2+)taking the place of K^(+),resulting in the composite inhibitor forms a hydrophilic structure,which prevents the adsorption of the collector on the surface of feldspar by interacting with the Al active site.The combination of Ca^(2+)and SS synergically strengthens the difference of collecting property between quartz and feldspar by collector,thus achieving the effect of efficient separation.A new strategy for flotation to separate quartz from feldspar in near-neutral pulp was provided.
基金a Grant from the Ministry of Education of the People’s Republic of China,No.NCET-05-0750a Grant from Guangdong Provincial Natural Science Research Team,No.5200491
文摘in hippocampal neurons is an important contributor to depression. [Ca^2+]i of hippocampal neurons may raise rapidly with increased corticosterone concentrations, leading to apoptosis. The anti-depressant effects of Xiaoyaosan (Free and Easy Wanderer's Powder) may inhibit apoptosis by down regulating the [Ca^2+]i overload. PC12 cells were containing with corticosterone to simulate neuronal injury, dosed with Xiaoyaosan-containing serum, and the following parameters were measured: apoptosis,[Ca^2+]i overload, and changes in mitochondrial membrane potential (△ψm) and bioenergetics. High-dose Xiaoyaosan-containing serum (the dose of intragastric administration was 2.633 g herb/mL) not only inhibited morphological injury and cell apoptosis, but also suppressed [Ca^2+]i overload induced by corticosterone. Xiaoyaosan also blocked the decrease in mitochondrial membrane potential and adenosine triphosphate levels induced by corticosterone. Xiaoyaosan dose-dependently suppresses corticosterone-induced apoptosis, potentially via inhibiting [Ca^2+]ioverload, and prevents impaired mitochondrial bioenergetics by maintaining mitochondrial membrane potential and adenosine triphosphate production, providing a putative mechanism for its antidepressant effects.