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1.
AIM: To observe the level of metallothionein (MT) in liver, aorta and plasma of rabbit with atherosclerosis (AS) in order to recognize the alteration of oxidative defense system in body when AS occurred.METHODS:Preparation of AS model of rabbit induced by having high-fat diet for eight weeks; the levels of MT and malondialdehyde (MDA) were measured in the tissues of liver and aorta and plasma of rabbit.RESULTS:The MT levels in liver tissues and plasma in atherosclerotic group increased 318%(P＜0.01) and 62% (P＜0.01), compared with control group, but its level in aortic tissue in atherosclerotic group decreased 33% (P＜0.01). The MDA levels in liver, aortic and plasma in atherosclerotic group increased 95%(P＜0.01), 76%(P＜0.01) and 42%(P＜0.01), respectively, compared with control group. The changes of contents of MT in liver and plasma have relation with level of MDA in liver tissues and plasma.CONCLUSION:The alteration of MT in liver tissues and plasma in atherosclerotic rabbits may be related to lipid hyperoxidative injury.  相似文献   

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3.
AIM:To investigate the protective effect of preconditioning on rabbit liver during total ischemia and reperfusion and its mechanism. METHODS: Using hepatic ischemia and reperfusion injury (HIRI) model in rabbits, animals were randomly divided into three groups: control group (A), non-preconditioning group(B) and preconditioning group(C), different effects of preconditioning on several parameters including alanine aminotransferase (ALT) activity and levels of nitric oxide (NO) and malondialdehyde (MDA) in plasma or liver tissue as well as hepatocellular morphological changes were measured and observed during HIRI. RESULTS:In C group NO levels of plasma and liver tissue were higher than those in B group (P＜0.05);While MDA levels and ALT value in plasma were lower than those in B group (P＜0.05 and P＜0.01); and there were not significant differences between C and A group (P＞0.05); abnormal morphological chages of liver cells in A group were ameliorated remarkably too during HIRI. CONCLUSION:Preconditioning can attenuate HIRI by improving NO level and reducing oxygen free radicals level.  相似文献   

4.
AIM: To investigate the relationship between the thrombin-activatable fibrinolysis inhibitor (TAFI) level in plasma and atherosclerosis, the TAFI level in plasma and blood fat and blood clotting index.METHODS: Totally 40 healthy male Wistar rats were randomly divided into 4 groups (n=10), control group, high lipid group, high lipid +vitamin D3 overload group, and high lipid +vitamin D3+endothelium injure group by treating the animals with normal diet, high lipid, high lipid+ vitamin D overload, and high lipid+vitamin D overload+endothelium injury, respectively, for inducing three stages of AS in rats. Then, the total cholesterol (TC), total triglyeride (TG), high density lipoprotein (HDL), low density lipoprotein (LDL), and prothrombin time (PT), activated partial thromboplasin time (APTT), fibrinogen (Fib), the activity of TAFI were measured.RESULTS: TC, TG, LDL-C, Fib and the activity level of TAFI in plasma in three model groups increased gradually compared with the control (P＜0.01). HDL-C, PT and APTT in plasma of three model groups decreased gradually compared with the control (P＜0.01 or P＜0.05). The activity of TAFI in plasma had positive correlation with TG, TC and Fib.CONCLUSION: The activity of TAFI increases in the progress of atherosclerosis. The activity of TAFI in plasma has a correlation with blood fat and coagulation, which indicates that TAFI might participate in the process of atherosclerosis, and TAFI is one of etiological factors of atherosclerosis.  相似文献   

5.
AIM:To investigate the effect of insulin on ox-LDL transferring the THP-1 cells to foam cells and influencing the LPL mRNA expression in THP-1 cells.METHODS:THP-1 cells were incubated with 50 mg/Lox-LDL and insulin at concentrations of 10 mU/L, 100 mU/L, 1 000 mU/L and 10 000 mU/L, respectively. The expression of LPL mRNA in cells was detected by RT-PCR. Lipoprotein lipase of THP-1 cells was presented by no-specific lipase staining. THP-1 cells were stained with oil red O. Accumulation of total cholesterol (TC) in THP-1 cells was determined with oxidase assay.RESULTS:In 100 mU/L、1 000 mU/L、10 000 mU/L insulin groups, LPL mRNA expression increased 2 times, the average cell perilength was longer, the percentage of positive oil red O staining cells was significant higher, the content of cholesterol in THP-1 cells was higher than in ox-LDL control (P＜0.05).CONCLUSION:Insulin accelerates transferring of THP-1 cells to foam cell with exposed to ox-LDL because LPL mRNA expression increased in the cells.  相似文献   

6.
AIM: To compare effects of SiNi-decoction and Vitamin E on vascular endothelial function of experimental atherosclerosis rabbits and their therapeutic action on atherosclerosis.METHODS:The model of experimental atherosclerosis rabbits fed with forage of high lipid was established and treated in groups randomly. At the end of the experiment, samples of aorta and blood were taken and the percentage of lipid plaque area of aortic endothelium ,lipid metabolism and vascular endothelial oxidative injury (SOD activity, MDA content, NO level, endothelin concentration) of each group were analyzed. RESULTS: In comparison with model group,the percentage of the lipid plaque area of aortic endothelium and endothelial oxidative injury (except for SOD of VitE group) of SiNi-high and mid-dose group and VitE group are reduced obviously (P＜0.05),and the index of lipid metabolism of SiNi-decoction group is improved (P＜0.05). CONCLUSION:The comprehensive therapentic effects of SiNi decoction on vascular endothelial oxidative injury and atherosclerosis are superior to VitE.  相似文献   

7.
AIM:To evaluate the effects of interfer α-2b (IFN α-2b ) on atherosclerosis(AS).METHODS:Thirty normal male rabbits were randomly divided into five groups:normal controlgroup(NCgroup,n＝6),atherosclerosisgroup(AS group, n=6),virus (herpesvirus Ⅰ,HSV-Ⅰ)infected atherosclerosis group(V group,n＝6), interferon (interferon α-2b) intervented atherosclerosis group (IFN-Ⅰgroup,n＝6),interferon intervented and virus infected atherosclerosis group (IFN-Ⅱ group, n＝6). Serum lipids were measured and the thoracic aortas were sampled for histopathological, immunohistochemical and in situ hybridization study.RESULTS:The aorta atherosclerosis areas of NC, IFN-Ⅰ and IFN-Ⅱ groups were lower than that of AS group significantly, respectively, and the area of AS group was lower than that of V group (P＜0.05). Platelet-derived growth factor B-chain (PDGF-β) expression was reduced both in IFN-Ⅰand IFN-Ⅱ groups(P＜0.05).CONCLUSIONS:Our data provide evidence that virus could cause atherosclerosis, and the AS formation could be inhibited by IFN α-2b through its antivirus effect and inhibitory effect on PDGF-β and VSMC proliferation.  相似文献   

8.
AIM:To investigate the effects of sodium ferulate on cholesterol and triglyceride metabolism in atherosclerosis with hyperlipidemia. METHODS:The rabbit model of atherosclerosis was produced by feeding high lipid forages. RAW264.7 foam cell and HepG2 injured cell models were established by incubation with oxidized low density lipoprotein (ox-LDL). The atherosclerotic plaque area was measured, and serum lipids were detected. The cellular lipid accumulation was examined by oil red O staining. The cellular contents of total cholesterol and cholesterol ester were quantified by high performance liquid chromatography. The hepatic lipase (HL) mRNA expression was determined by RT-PCR. RESULTS:(1) Compared with hyperlipid group, the aorta atherosclerosis plaque area and the serum triglyceride level were significantly decreased in sodium ferulate-treated rabbits, but the serum cholesterol level showed little change. (2) Compared with ox-LDL group, the HL mRNA expression in HepG2 cells was enhanced significantly in sodium ferulate-treated group, but the cellular contents of total cholesterol and cholesterol ester in RAW264.7 foam cells showed little change. CONCLUSION:Sodium ferulate inhibits the formation of atherosclerotic plaque in high-cholesterol-fed rabbits aorta. This antiatherosclerotic function may reduce serum triglyceride level through enhancing the expression of HL mRNA without influencing serum cholesterol level and foam cell formation.  相似文献   

9.
AIM:To explore the significance of platelet activation, fibrinolytic activity and the changes of vasoactive mediators in acute myocardial infarction in rabbits and the intervention of amiodarone and metoprolol.METHODS:Fifty New Zealand white rabbits were randomly assigned to five groups, ten for each. Group Ⅰ: sham group, group Ⅱ: acute myocardial infarction(AMI) group, group Ⅲ: AMI and lidocaine group, group Ⅳ: AMI and amiodarone group, group Ⅴ: AMI and metoprolol group.The middle point of left ventricular coronary artery was ligated (groupⅡ,Ⅲ, Ⅳ and Ⅴ ) or a sham ligation(group Ⅰ). Four hours later, blood was collected for measuring plasma concentration of TXB2, 6-Keto-PGF1α, ET, NO, plasma activity of t-Pa and PAI.After that, the heart was taken out to evaluate the infarction size(IS).RESULTS:Plasma concentration of TXB2, ET, NO and plasma activity of PAI were significantly higher in groupⅡ,Ⅲ, Ⅳ and Ⅴ than those in group Ⅰ(P＜0.01), but the plasma concentration of 6-Keto-PGF1α and plasma activity of t-Pa were remarkably lower in groupⅡ,Ⅲ, Ⅳ and Ⅴ than those in group Ⅰ(P＜0.01). There were no difference in plasma concentration of TXB2, 6-Keto-PGF1α, t-Pa activity and infarction size in group Ⅱ,Ⅲ and Ⅳ(P＞0.05).Compared to group Ⅱ, plasma concentration of ET, NO and PAI activity were significantly decresed (P＜0.01)in group Ⅳ. Plasma concentration of TXB2, ET, NO and plasma activity of PAI were significantly lower in groupⅤ than those in group Ⅱ(P＜0.01). Conversely, plasma concentration of 6-Keto-PGF1 and plasma activity of t-Pa were remarkably higher in group Ⅴ than those in group Ⅱ(P＜0.01). The infarction size was remarkly decrease(P＜0.01)in group Ⅴ.CONCLUSIONS:Amiodarone inhibited PAI avtivity, decreased release of ET and NO in AMI in rabbits. Metoprolol inhibited platelet activation, improved fibrinolytic, decreased release of ET and NO, and reduced myocardial infarction size in AMI in rabbits; Lidocaine had no effect above.  相似文献   

10.
AIM: To observe the changes of metallothionein (MT) in various tissues of mice during hyperhomocysteinemia. METHODS: Intraperitoneal injection of homocysteine into mice induced hyperhomocysteinemia. The contents of tissue MT and malondialdehyde (MDA) in liver, heart and kidney were determined. RESULTS: Compared with control group, tissue MT levels in Hcy-group animals were increased by 210% (P＜0.01) for liver, by 133% (P＜0.05) for heart and by 60% (P＜0.01) for kidney. Tissue MDA contents were increased by 6%, 52%(P＜0.05) and 69% (P＜0.05), respectively. However, in treated animals with Hcy plus superoxide dismutase (SOD), the tissue MT contents in liver, heart and kidney were decreased by 22% (P＜0.05), 33% (P＜0.05) and 13% (P＞0.05), respectively, compared with Hcy alone group. Tissue MDA contents were decreased by 24% (P＜0.05), 21% (P＜0.05) and 48% (P＜0.01). There was a positive correlation between tissue MT content and MDA level. CONCLUSION: Hcy could induce tissue MT formation through oxidative stress.  相似文献   

11.
AIM:To investigate the effect of tea-polyphenols (TP) on the activation of NF-κB and the expression of TGF-β1 mRNA in THP-1 cells (a human acute monocytic leukemia cell line). METHODS:THP-1 cells were incubated with the different concentrations of TP, VLDL, LDL or ox-LDL. In the THP-1 cellls, the nuclear malposition rate of NF-κB was detected with immunohistochemistry technique, the positive index of the TGF-β1 mRNA expression was detected by hybridization in situ, and accumulation of total cholesterol (TC) in cells incubated with 0.4-40 μg/L TP was determined with oxidase assay. RESULTS:The nuclear malposition rate of NF-κB, the positive index of the TGF-β1 mRNA expression and TC in THP-1 cells incubated with 0.4-40 μg/L of TP were lower than those with 0 μg/L of TP in TP-V group, TP-L group and TP-O (P＜0.05). The differences of these markers in THP-1 cells incubated with more than 40 μg/L TP in TP-V group, TP-L group and TP-O were not statistically significant, compared with TP-C group (P＞0.05). CONCLUSION:TP inhibited the activation of NF-κB, the expression of TGF-β1 mRNA and the foam cell formation in the mono-macrophage.  相似文献   

12.
AIM: To study the effects of Tongxinluo on the activation of platelets in a rabbit model of atherosclerosis. METHODS: New Zealand rabbits were randomly divided into 7 groups: normal group, model group, the groups treated with high, medium and low doses of Tongxinluo micropowder (0.15, 0.3 and 0.6 g·kg-1·d-1), atorvastatin group (2.5 mg·kg-1·d-1), and aspirin group (12.5 mg·kg-1·d-1). The rabbits in normal group was fed with common diet for 12 weeks, and the rabbits in model group were fed with high-fat diet for 12 weeks to establish atherosclerosis model. The rabbits in the rest groups were treated with the corresponding drugs, at the same time to give high-fat diet. Fasting for 12 h after the last treatment, whole blood was collected to perform the blood routine test, and to measure serum and plasma levels of lipids, platelet factor 4 (PF4) and soluble CD62P (sCD62P). Flow cytometry was used to analyze platelet calcium ion concentration. Electron microscopy was used for platelet superfine observations, and light microscopy for observing the pathological changes. RESULTS: Compared with normal group, the levels of triglyceride (TG), total cholesterol (TC), low-density lipoprotein cholesterol (LDL-C), platelet counts, and mean platelet volume in model group were significantly elevated, and the levels of PF4, sCD62P and calcium were also significantly increased (P < 0.05). Compared with model group, except aspirin group, the levels of TG, TC and LDL-C in high, medium and low doses of Tongxinluo groups and atorvastatin group were effectively decreased. The platelet counts and mean platelet volume in all treatment groups were markedly decreased, and the serum levels of PF4, sCD62P and Ca2+ in platelet (P < 0.05) were reduced. In electron microscopic observation, the shape of platelet was regular and organelles distributed uniform in normal group. However, in model group, the shape of platelet was irregular, pseudopodia forming was obviously observed, and α particles and dense granules decreased, indicating that the platelet was activated. To a different extent, the platelet shape, increase in the number of α particles and dense granules were improved in treatment groups and the damage of the cytoplasm was attenuated. Through histopathological observation, the intimal was smooth and complete in normal group. In the model group, the intimal thickness markedly increased, foam cell aggregated, and plaque was formed. Compared with model group, the intimal thickening and the number of foam cells were significantly decreased, and plaque formation was not obvious in atorvastatin group and high dose of Tongxinluo group. The pathological damages in the other treatment groups were alleviated in different degrees. CONCLUSION: Tongxinluo significantly inhibits the activation of platelets in the process of atherosclerosis, and has important clinical value to delay the atherosclerotic thrombosis.  相似文献   

13.
AIM: To investigate the changes of plasma glutathione peroxidase (GSH-PX) and catalase (CAT) activities in nude mice (NM) bearing human nasopharyngeal carcinoma (NPC) and observe the effect of naja naja atra venom (NNAV) on them. METHODS: Plasma GSH-PX and CAT activities in human NPC bearing NM treated (i.p.) by low, middle or high concentration NNAV solution (1 mg/L, 5 mg/L, 10 mg/L) were determined by colorimetry. RESULTS: Plasma CAT activity (16 450 U/L) in NM bearing tumor group decreased significantly in comparison with the control group (20 680 U/L)(P＜0.05). Plasma GSH-PX activity (27 670 U/L) in NM bearing tumor group had no apparent alteration in comparison with the control group (28 790 U/L)(P＞0.05). Treated by low, middle or high concentration NNAV solution, CAT activities of three NM bearing tumor groups (20 570 U/L, 23 090 U/L, 21 280 U/L) were higher than that of the NM bearing tumor group without NNAV treatment (16 450 U/L) (P＜0.05), and reached to control level (20 680 U/L)(P＞0.05). GSH-PX activities of the three groups (especially high concentration group) were higher than that of the group without NNAV treatment (P＜0.05). CONCLUSION: The antitumor effect of NNAV might be by means of increasing GSH-PX activity and CAT activity in NM bearing human NPC.  相似文献   

14.
AIM:To investigate the effect of urantide on the liver function and histomorphology in the rats with atherosclerosis (AS).METHODS:The AS Wistar rat model was induced by intraperitoneal injection of vitamin D3 (VD3) and feeding with high-fat diet. The rats were randomly divided into normal control group, AS model group, positive medicine group and urantide group. The liver function indexes of the rats were measured by biochemical test, and the pathological changes of the aorta and liver of the rats were observed by hematoxylin-eosin (HE) staining. The mRNA expression of urotensin Ⅱ (UⅡ) and GPR14 at mRNA and protein levels in rat livers was determined by RT-qPCR and Western blot. RESULTS:The levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), γ-glutamyltransferase (γ-GT), lactate dehydrogenase (LDH), total bilirubin (TBIL), indirect bilirubin (IBIL) and alkaline phosphatase (ALP) in AS model group were significantly increased compared with normal control group (P<0.05). The above indexes in urantide group were remarkably decreased compared with AS model group (P<0.05). No change of the levels of direct bilirubin (DBIL), total protein (TP), globulin (GLB) and albumin (ALB) in each group was observed. Urantide postponed hepatocyte fatty degeneration and repaired hepatocyte injury in the AS rats. Compared with normal control group, the mRNA and protein levels of UⅡ and GPR14 in the liver were significantly increased in AS model group (P<0.05). With the prolongation of dosing time, the mRNA and protein levels of UⅡ and GPR14 in the liver were significantly decreased in urantide group compared with AS model group (P<0.05). CONCLUSION:Urantide significantly attenuates the liver damage caused by liver fatty degeneration in AS rats.  相似文献   

15.
Endothelial lipase (EL),a newly described member of the triglyceride lipase gene family,displays a previously phospholipase A1 activity,remodels high density lipoprotein (HDL) particle and reduced plasma HDL-cholesterol levels and the ability to joint to scavenger receptor class B type 1 (SR-B1).Furthermore,EL also increases cellular apolipoprotein B-containing lipoprotein uptake,monocyte adhesion and infiltration into the tissues.Recently,some studies showed that the vascular atherosclerotic lesions were markedly attenuated in EL deficient mice compared with control,suggesting that EL may play a significant role in the formation of atherosclerotic lesions.  相似文献   

16.
AIM: To study the effect of Salvia miltiorrhiza injection on rat atherosclerosis (AS), and elucidate the possible mechanism. METHODS: Wistar rats were fed with fat-rich diet and high dose of vitamin D3 to induce AS, then treated with Salvia miltiorrhiza injection. Concentrations of triglyceride (TG) and total cholesterol (TC) in serum were measured by automatic serum biochemical assay. The level of ICAM-1 protein and mRNA were determined by Western blot and RT-PCR. RESULTS: Compared with the AS model group, the levels of TG and TC in serum were significantly lower in Salvia miltiorrhiza injection group (P<0.05). Western blot and RT-PCR showed that the level of ICAM-1 protein and mRNA were decreased in Salvia miltiorrhiza injection group compared with AS group. CONCLUSION: Salvia miltiorrhiza injection decreased blood lipid and reduced the ICAM-1 gene expression in rats with atherosclerosis.  相似文献   

17.
AIM:To explore the therapeutic effect of Qishen-Yiqi dripping pills (QS) on atherosclerosis (AS) and the mechanism. METHODS:AS rat model was established by high-fat diet, and SD rats were randomly divided into normal control group, AS model group, low-dose, middle-dose and high-dose QS groups, and positive group (n=6 each). After administration for 12 weeks, serum samples were collected to detect the serum lipid and Ca2+ levels. HE staining was used evaluated the histopathological changes of arterial tissue. The serum levels of interleukin-1β (IL-1β), IL-6 and tumor necrosis factor-α (TNF-α) were measured by ELISA. The nitric oxide (NO) level was detected by nitrate reductase method. The protein levels of transient receptor potential channel protein 1 (TRPC1), stromal interaction molecule 1 (STIM1) and endothelial NO synthase (eNOS) were determined by Western blot. RESULTS:QS significantly reduced the arterial damage via inhibiting the formation of atherosclerotic plaque and attenuated intimal thickening and vascular stenosis. Compared with AS group, the serum levels of total cholesterol (TC), triglyceride (TG) and low-density lipoprotein cholesterol (LDL-C) were decreased significantly and the levels of high-density lipoprotein cholesterol (HDL-C) were increased significantly in high-dose QS group (P<0.05). The serum levels of IL-1β, IL-6 and TNF-α in high-dose QS group were lower than those in AS group (P<0.05). Compared with AS group, the serum Ca2+ level was lowered and the arterial tissue NO level was elevated in QS groups (P<0.05). Compared with AS rats, the protein levels of TRPC1 and STIM1 were decreased significantly and the protein level of eNOS was increased significantly in the rats treated with QS (P<0.05). CONCLUSION:QS regulate calcium homeostasis via TRPC1/STIM1 pathway, increase the production of NO and inhibit the inflammatory responses, thus exerting anti-AS effect.  相似文献   

18.
AIM:To observe the effects of Sini decoction on atherosclerosis(AS) and ceramide content of aorta in rabbits. METHODS:28 rabbits were randomly divided into three groups. Control group was fed with a normal diet; High cholesterol group was fed 1% cholesterol and 5% fat diet; Sini decotion+ high cholesterol group was fed 1% cholesterol and 5% fat diet plus Sini decotion (4.2 g·kg-1·d-1). At the end of study, the plaque area were measured, the atorta ceramide and cell apoptosis were also detected. RESULTS:Sini decotion diminished lipid plaque area on the aortic endothelium, reduced the levels of aorta ceramide and the apoptosis index. CONCLUSION:Sini decoction has an inhibitory effect on AS, the mechanism may be that Sini decotion reduces concentration of ceramide in aorta.  相似文献   

19.
AIM: To observe the inhibitory effect of recombinant human endostatin (rhES) on plaque angiogenesis, and to explore the regulatory mechanism of Dll4/Notch pathway in the anti-angiogenic effect of rhES. METHODS: Male Wistar rats were randomized into 3 groups:normal control group (N group), atherosclerotic model group (AS group), and rhES treated group (AS+rhES group). The rats in N group were fed a normal diet, while the remaining 2 groups were established to atherosclerotic rat model via high-cholesterol diet, intraperitoneal injection of vitamin D3 and aortic balloon injury. The rats in AS+rhES group received intraperitoneal injection of rhES. The blood total cholesterol (TC), triglyceride (TG), low-density lipoprotein cholesterol (LDL-C), C-reactive protein (CRP), interleukin-1 (IL-1) and troponin I (TnI) were measured. The atherosclerotic abdominal aortas were taken for pathological observation. Immunohistochemical staining was used to measure the density of neovessels in the plaques, which were marked by CD31. The protein levels of Dll4 and Notch1 in the aortas were analyzed by Western blot. RESULTS: The levels of blood TC, TG, LDL-C, CRP and IL-1 in AS group and AS+rhES group were much higher than those in N group (P<0.05), and no statistical difference between AS group and AS+rhES group was observed. The expression of CD31 in AS group was the highest among all groups. Compared with AS group, the density of neovessels in the plaques of AS+rhES group decreased significantly (P<0.05). The protein expression of Dll4 and Notch1 in AS group was lower than that in N group (P<0.05). Compared with AS group, the protein expression of Dll4 and Notch1 increased significantly (P<0.05). CONCLUSION: rhES has the ability to inhibit plaque angiogenesis in rats. The activation of Dll4/Notch pathway may be the mechanism of rhES in inhibiting plaque angiogenesis.  相似文献   

20.
AIM: To explore the effect of dietary black rice outlayer fraction (BRF) on inducible nitric oxide synthase (iNOS) expression, and elucidate the possible mechanism of BRF anti-atherogenesis in apoE-deficient mice. METHODS: After 16 weeks intervention by 5% BRF, aortic iNOS activity in different groups was determined by RIA. iNOS mRNA expression in aorta were analyzed by RT-PCR. RESULTS: Mice in BRF group showed weaker expression of iNOS mRNA and lower iNOS activity than those in positive and WRF group (P＜0.05). No significant difference was observed between positive group and WRF group (P＞0.05). CONCLUSION:The supplementation of BRF has dra- matically reduced aortic sinus atherosclerotic plaque areas compared to WRF in apoE-deficient mice and its action of ant-atherogenesis may be attributed to its inhibition of iNOS activity and iNOS mRNA expression.  相似文献   

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