SOD、Vc和Zn对老年性白内障大鼠晶状体中Na-K ATP酶、Mg-ATP酶活性的影响

目的 :旨在为防治大鼠半乳糖性白内障提供实验依据 ,进而为探索防治老年性白内障提供一定的理论依据。方法 :分别给予纯系 Wistar大鼠 4～ 5周龄腹腔注射 SOD,SOD和 Zn,SOD、 Zn和 Vc,共观察 2 0 d。结果 :SOD,SOD和 Zn,SOD、 Zn和 Vc联合用药均可使 Na- K ATP酶、Mg- ATP酶活性显著增高 (P <0 .0 1)。结论 :不同药物组对晶体混浊的抑制作用不同 ,联合用药组与单一用药组均对延缓晶体混浊效果最显著     

Lack of correlation between [3H]ouabain binding and Na-K ATPase inhibition in rat aorta

The binding of [3H]ouabain to intact strips of rat aorta was compared with the ability of ouabain to inhibit the uptake of 86Rb by the same preparation. When a cold temperature wash was used to process tissues after binding of [3H]ouabain, a class of relatively high affinity binding sites was found (KD = 1.2 X 10(-7) M). Binding was saturable and sensitive to both ATP depletion and elevated potassium. Elevation of cytoplasmic Ca2+ levels by phenylephrine or c-AMP levels by theophylline and terbutaline had no influence on [3H]ouabain binding. Ouabain inhibition of 86Rb uptake progressed to 60% of the total 86Rb uptake at 2 X 10(-3) from a threshold of about 10(-5) M. Half-maximal inhibition by ouabain occurred at a concentration of 10(-4) M. The disparity between [3H]ouabain binding and inhibition of 86Rb uptake indicates that the high affinity binding site in the rat does not contribute to inhibition of Na-K ATPase function.     

Role of Mitochondrial Enzymes and Sarcoplasmic ATPase in Cardioprotection Mediated by Aqueous Extract of Desmodium gangeticum (L) DC Root on Ischemic Reperfusion Injury

The present study investigate the protective effect of aqueous root extract of Desmodium gangeticum in preserving mitochondrial and sarcoplasmic ATPase during ischemia reperfusion injury. The isolated rat hearts in both drug and control group were subjected to warm ischemia (37°), followed by reperfusion with the Langendorff perfusion system. The aqueous root extract of Desmodium gangeticum (L) at a dose of 50 mg/kg body weight was found to be effective in the rat heart for the management of ischemic reperfusion injury. Physiological parameters were significantly (P<0.05) improved in drug treated rat hearts. Creatine phosphokinase in coronary perfusate found to be declined. Moreover, sarcoplasmic ATPase and mitochondrial enzymes were significantly (P<0.05) improved in drug treated rat hearts. In fact, histological analysis of the myocardium also suggested an improved ultra structure in Desmodium gangeticum treated rat heart. These results suggest that Desmodium gangeticum aqueous root extract can preserve the mitochondrial and sarcoplasmic ATPase in the myocardium, resulting in the improvement of cardiac function after ischemia reperfusion injury.     

参附注射液对大鼠肝缺血再灌注损伤时ATP酶的影响

目的:研究参附注射液对肝缺血再灌注损伤大鼠的保护作用及可能机制。方法:将36只大鼠随机分为参附注射液(SF)组与生理盐水对照(NS)组。肝脏缺血15min,分别于再灌注后1、3、24h取肝组织测定Na+-K+-ATP酶、Ca2+-Mg2+-ATP酶水平,并行酶组织化学染色,观察Ca2+-ATP酶的活性变化。结果:再灌注1、3h后,SF组肝组织中Na+-K+-ATP酶、Ca2+-Mg2+-ATP酶水平显著高于NS组;但在24h时,2组数据无显著性差异(P>0.05)。结论:参附注射液可以通过保护ATP酶发挥对大鼠肝缺血再灌注损伤早期保护作用。     

芍药苷对脑缺血再灌注沙土鼠ATP酶和兴奋性氨基酸的影响

目的探讨芍药苷对沙土鼠脑缺血再灌注（CI/R）损伤的保护作用及其作用机制。方法采用结扎双侧颈总动脉缺血10 min再灌注6 h,建立沙土鼠CI/R模型,随机分为假手术组、模型组、芍药苷3个剂量组（20、10、5 mg·kg^-1）,每组10只,术前3天开始腹腔注射给药。观察再灌注6 h内神经症状,计算卒中指数;取脑组织匀浆,定磷法测定ATP酶活性,高效液相色谱法测定谷氨酸（Glu）和天冬氨酸（Asp）含量。结果与模型组比较,芍药苷各剂量均能降低CI/R沙土鼠的卒中指数（P〈0.05或P〈0.01）,各剂量均可显著升高脑组织Ca2＋-ATP酶活性（P〈0.05）,高、中剂量组能显著升高Na＋-K＋-ATP酶活性（P〈0.05或P〈0.01）,各剂量均能降低脑组织Glu含量（P〈0.05或P〈0.01）。芍药苷对脑组织Mg2＋-ATP酶活性和Asp含量则无明显影响。结论芍药苷预处理对CI/R损伤的保护作用与其保护脑细胞膜ATP酶的活性、抑制Glu的释放、降低兴奋性氨基酸毒性等有关。     

Effects of vanadate on mechanical responses and Na-K pump in vascular smooth muscle

The effects of vanadate on tension and on the Na-K pump in isolated guinea-pig aorta were investigated. Vanadates (NH₄VO₃ or Na₃VO₄ · nH₂O) (10^?3 M) produced a sustained contraction (about 0.5 g) which was not influenced by phentolamine (10^?6 M). In the absence of external Ca, vanadate and norepinephrine (2 × 10^?6 M) induced a small contraction, although high K (45.4 mM) did not. In a Ca-depleted, high K (142.2 mM) solution, vanadate and norepinephrine still caused muscle contraction. D600 (10^?6 M) slightly inhibited the contractions induced by vanadate and norepinephrine, while this agent completely inhibited the contraction induced by high K. Sodium nitroprusside (10^?5 M) strongly inhibited the contractions induced by vanadate and norepinephrine but not the contraction induced by high K. Vanadate produced a contraction in K-free solution with ouabain (10^?4 M). The tissue K content did not change during a 2 h treatment of the muscle with vanadate. Reaccumulation of K following a 3 h treatment of the muscle with K-free solution was inhibited by ouabain but not by vanadate. These results indicate a similarity between the contractions induced by vanadate and by norepinephrine and suggest that the vanadate-induced contraction is not due to an inhibition of the Na-K pump.     

可乐定对原代培养大鼠皮质神经元氧糖剥夺损伤的保护作用

目的：研究可乐定对原代培养大鼠皮质神经元氧糖剥夺( OGD)损伤的保护作用。方法取培养8 d的皮质神经元,分为正常对照组、模型对照组、可乐定(1.0,3.0,10.0μmol·L-1)预处理组。神经元氧糖剥脱损伤模型通过化学性缺氧、孵育液缺糖的方法建立。神经元损伤程度采用噻唑蓝( MTT)染色法和检测乳酸脱氢酶( LDH)的释放量来进行评价,观察预给予可乐定(1.0,3.0,10.0μmol·L-1)对神经元损伤的保护作用。结果显微镜下,正常对照组细胞密集,胞体饱满,边缘光滑,有较强折光性;神经元存活率(100.00±32.12)％,LDH释放比率(100.00±37.51)％。模型对照组细胞核固缩,细胞膜不完整,折光性差,MTT染色吸光度值明显降低,神经元存活率(53.61±7.62)％,LDH释放量显著增加,释放率为(166.07±9.65)％。可乐定(1.0,3.0,10μmol·L-1)预处理可明显逆转ODG损伤所致细胞形态的改变,剂量依耐性升高MTT染色吸光度值,神经元存活率分别为(67.53±10.54)％,(71.50±9.79)％和(87.48±5.29)％,同时可明显降低LDH的释放量,释放率分别为(136.45±25.72)％,(130.92±24.94)％和(121.63±32.68)％。结论可乐定对原代培养大鼠皮质神经元ODG损伤具有良好的保护作用。     

通窍健脑胶囊对大鼠脑缺血再灌注损伤后ATP酶的影响

目的 :研究通窍健脑胶囊对实验性脑缺血再灌注损伤的保护作用。方法 :用结扎大鼠双侧颈总动脉不完全脑缺血 4 5min再灌注 90min模型 ,观察通窍健脑胶囊对脑组织ATP酶活性的影响。结果 :通窍健脑胶囊可明显升高各ATP酶的活性。结论 :通窍健脑胶囊对脑缺血再灌注有显著的保护作用 ,其机制与防止脑内多种ATP酶活性降低有关。     

The Protective Effect of Ischemic Postconditioning Against Ischemic Injury: From the Heart to the Brain

Postconditioning, a series of mechanical interruptions of reperfusion after ischemia, prevents ischemia/reperfusion injury in myocardial infarction. The extensive studies of postconditioning in myocardial infarction have led to clinical trials. This article reviews the protective effects of postconditioning against ischemia from the heart to the brain and provides insights on how studies of postconditioning in the field of heart ischemia have shed light on postconditioning of the brain. Because brain ischemia has many mechanisms in common with heart ischemia, it is logical to test whether postconditioning protects against brain ischemia as well. A few groups have reported that postconditioning reduces infarct size in focal cerebral ischemia and improves deficits of short-term memory and motor coordination after global cerebral ischemia. However, many outstanding issues remain elusive regarding the protective effects of postconditioning against cerebral ischemia. Future studies should further identify parameters that generate the strongest protection for postconditioning against cerebral ischemia and should study whether postconditioning provides long-term protection. In addition, clarification of the underlying protective mechanisms should be pursued. This will certainly enhance our understanding of this novel phenomenon and may provide important clues for developing pharmacological analogues for stroke treatment. An erratum to this article can be found at     

丹红注射液对缺血性脑损伤大鼠海马CA1区醛糖还原酶表达的影响

目的 考察丹红注射液对脑缺血再灌注模型大鼠海马CA1区醛糖还原酶（aldose reductase,AR）表达的影响,并探讨其作用机制。方法 SD大鼠随机分为假手术组、缺血再灌注组（模型组）、缺血再灌注加丹红注射液组（丹红注射液组）、缺血再灌注加依帕司他组（依帕司他组）,采用改良线栓法制作大脑中动脉缺血1 h再灌注模型,在大鼠脑缺血再灌注开始时丹红注射液组、依帕司他组分别按2 mL·kg^-1、20 μg·kg^-1在0,24,48 h尾静脉注射给药,72 h后处死大鼠取材。通过HE染色、免疫组化及Western blot等方法考察大鼠海马CA1区神经元细胞病理形态变化、AR的阳性细胞指数以及AR蛋白的表达变化。结果 给药72 h后,与假手术组相比,模型组大鼠脑组织海马CA1区神经元细胞凋亡较多,分布排列紊乱,且AR的阳性细胞数表达增多（P<0.05）,Western blot显示AR表达量升高（P<0.05）。与模型组相比,丹红注射液组和依帕司他组神经元细胞凋亡减少,分布排列更整齐;丹红注射液组AR的阳性指数降低（P<0.05）,且Western blot显示AR表达量降低（P<0.05）。结论 脑缺血再灌注损伤可激活大鼠海马CA1区AR的表达。丹红注射液对脑组织海马CA1区神经元细胞具有保护作用,其作用机制可能与降低AR的表达有关。     

Regulation of NO-dependent acetylcholine relaxation by K channels and the Na-K ATPase pump in porcine internal mammary artery

This study was designed to determine whether K⁺ channels play a role in nitric oxide (NO)-dependent acetylcholine relaxation in porcine internal mammary artery (IMA). IMA segments were isolated and mounted in organ baths to record isometric tension. Acetylcholine-elicited vasodilation was abolished by muscarinic receptor blockade with atropine (10^-6 M). Incubation with indomethacin (3 × 10⁻⁶ M), superoxide dismutase (150 U/ml) and bosentan (10⁻⁵ M) did not modify the acetylcholine response ruling out the participation of cyclooxygenase-derivates, reactive oxygen species or endothelin. The relaxation response to acetylcholine was strongly diminished by NO synthase- or soluble guanylyl cyclase-inhibition using l-NOArg (10⁻⁴ M) or ODQ (3 × 10⁻⁶ M), respectively. The vasodilation induced by acetylcholine and a NO donor (NaNO₂) was reduced when rings were contracted with an enriched K⁺ solution (30 mM), by voltage-dependent K⁺ (K_v) channel blockade with 4-amynopiridine (4-AP; 10⁻⁴ M), by Ca²⁺-activated K⁺ (K_Ca) channel blockade with tetraethylammonium (TEA; 10⁻³ M), and by apamin (5 × 10⁻⁷ M) plus charybdotoxin (ChTx; 10⁻⁷ M) but not when these were added alone. In contrast, large conductance K_Ca (BK_Ca)_, ATP-sensitive K⁺ (K_ATP) and inwardly rectifying K⁺ (K_ir) channel blockade with iberiotoxin (IbTx; 10⁻⁷ M), glibenclamide (10⁻⁶ M) and BaCl₂ (3 × 10⁻⁵ M), respectively, did not alter the concentration-response curves to acetylcholine and NaNO₂. Na⁺−K⁺ ATPase pump inhibition with ouabain (10⁻⁵ M) practically abolished acetylcholine and NaNO₂ relaxations. Our findings suggest that acetylcholine-induced relaxation is largely mediated through the NO-cGMP pathway, involving apamin plus ChTx-sensitive K⁺ and K_v channels, and Na⁺−K⁺-ATPase pump activation.     

Human Herpesvirus 6 (HHV-6) Induces Dysregulation of Glutamate Uptake and Transporter Expression in Astrocytes

Human herpesvirus 6 (HHV-6) infects and establishes latency in the central nervous system (CNS). Reactivation of latent HHV-6 has been associated with neurologic diseases including epilepsy and multiple sclerosis (MS). In vivo, HHV-6 has been localized to astrocytes and can infect human astrocytes in vitro, suggesting that this virus may have a tropism for glial cells and may affect glial cell function. An essential role of astrocytes in the CNS is active maintenance of the excitatory neurotransmitter glutamate. Dysregulation of glutamate has been implicated as a potential mechanism of disease in both epilepsy and MS. Both disorders have demonstrated elevated glutamate in CSF and may be associated with dysregulation of glutamate signaling, uptake, and metabolism. This study demonstrates dysregulation of glutamate uptake in human astrocytes infected with both variants of HHV-6, A and B, with differential effects of HHV-6 in acute and persistently infected cells. Whereas astrocytes acutely infected with HHV-6 demonstrated increased glutamate uptake, cells persistently infected with HHV-6A and HHV-6B demonstrated impaired glutamate uptake. Functional dysregulation of glutamate uptake was associated with early increases in mRNA and protein expression of the glial glutamate transporter EAAT-2 followed by a sustained decrease in mRNA expression in astrocytes infected with both HHV-6A and HHV-6B. Dysregulated glutamate uptake and transporter expression suggests a mechanism for dysregulation of glutamate levels in vivo and a potential mechanism for virus-associated neurologic disease. This work was supported by the National Institutes of Health/National Institute of Neurological Disorders and Stroke. JF was supported by the MS Society of Canada.     

大鼠脑缺血损伤后MDA含量和SOD活性变化及胡黄连苷Ⅱ干预作用

目的通过正交试验优化胡黄连苷Ⅱ治疗大鼠脑缺血损伤的最佳剂量和时间窗。方法应用双侧颈总动脉结扎法(BCCAO)建立大鼠前脑缺血模型,按照正交试验设计分组,经腹腔注射胡黄连苷Ⅱ干预治疗,硫代巴比妥酸法测定血清和脑组织中脂质过氧化物丙二醛(MDA)的含量。黄嘌呤氧化酶法检测血清和脑组织中超氧化物歧化酶(SOD)的活性。结果胡黄连苷Ⅱ治疗脑缺血损伤的最佳效果,根据血清和脑组织MDA含量分析,均为脑缺血1.5h腹腔注射10mg/kg体质量。根据血清和脑组织SOD活性分析,均为脑缺血1.5h腹腔注射20mg/kg体质量。结论从用药剂量最小化和治疗时间窗最大化的角度综合评价,胡黄连苷Ⅱ治疗脑缺血损伤的最佳治疗时间窗和剂量为脑缺血1.5 h腹腔注射10-20mg/kg体质量。     

丁苯酞对于星型胶质细胞炎症反应的保护作用及缝隙连接蛋白Cx43表达的影响

目的 研究丁苯酞（dl-3-n-butylphthalidle,NBP）对于脂多糖（lipopolysaccharide,LPS）诱导的星型胶质细胞（astrocytes,Ast）炎症反应的抑制作用和机制,同时观察其对于缝隙连接蛋白Cx43表达的影响。方法 Ast细胞采用梯度浓度的NBP处理,1 μg·mL^-1的LPS诱导炎症反应。试剂盒检测乳酸脱氢酶（lactate dehydrogenase,LDH）漏出量,CCK-8法检测细胞存活率,Griess法检测NO的释放水平,ELISA法检测培养基中炎症因子IL-1β、IL-6及TNF-α的表达水平。Western blotting法检测p65,p-IκB,Cx43的表达。免疫荧光染色法检测Cx43的分布。siRNA沉默Ast中Cx43的表达,LPS诱导炎症发生后,检测Ast的炎症因子释放以及细胞存活水平。结果 NBP可以降低Ast细胞中LDH的漏出,提高细胞存活率,抑制炎症因子的释放,同时抑制细胞中p65、p-IκB的表达。NBP可以同时抑制Ast中Cx43的表达。siRNA沉默Cx43后,Ast的炎症反应得到抑制。结论 丁苯酞可以抑制LPS诱导的Ast炎症反应,而Cx43与炎症反应的发生有关。丁苯酞抑制Ast炎症反应与抑制Cx43的表达有关。     

氯胺酮对脑缺血大鼠纹状体DA含量和Na~+,K~+-ATP酶活性的影响

目的研究脑缺血大鼠纹状体多巴胺含量和Ｎａ＋，Ｋ＋－ＡＴＰ酶活性的变化以及ＮＭＤＡ受体拮抗剂氯胺酮对这些变化的影响。方法采用大鼠４－Ｖ－Ｏ造成急性脑缺血模型，缺血１０ｍｉｎ后分别应用ＨＰＬＣ－ＥＣＤ和比色法测量纹状体ＤＡ含量以及Ｎａ＋，Ｋ＋－ＡＴＰ酶活性。结果脑缺血前１５ｍｉｎ腹腔注射氯胺酮（２５ｍｇｋｇ－１和５０ｍｇｋｇ－１）能明显拮抗脑缺血时ＤＡ含量和Ｎａ＋，Ｋ＋－ＡＴＰ酶活性的降低。结论氯胺酮可通过阻断ＮＭＤＡ受体，抑制纹状体ＤＡ释放和Ｎａ＋，Ｋ＋－ＡＴＰ酶活性的降低，对抗脑缺血损伤。     

体内外急性酒精性肝损伤模型的研究

目的:建立体内外急性酒精性肝损伤模型,为进一步研究药物对肝损伤的保护作用奠定基础。方法:测定乙醇的半数致死量,观察不同给药途径不同剂量下血清丙氨酸氨基转移酶(ALT)、门冬氨酸氨基转移酶(AST)活性变化。利用乙醇体外诱导原代培养的肝细胞损伤,检测不同时间和剂量下培养液上清乳酸脱氢酶(LDH)释放量。结果:小鼠灌胃乙醇的半数致死量为9．98 g·kg-1,乙醇灌胃剂量大于6．4 g·kg-1、腹腔注射剂量大于4．0 g·kg-1时,血清ALT、AST有升高趋势。50-400 mmol·L-1乙醇作用于大鼠肝细胞,培养液上清中LDH释放量有增加趋势。结论:体内、体外急性酒精性肝损伤的最适损伤剂量分别为7．2 g·kg-1和50～100 mmol·L-1。     

粉防己碱对缺血顿抑大鼠心肌功能和ATP酶活力的影响

目的：观察粉防己碱（ｔｅｔｒａｎｄｒｉｎｅ，Ｔｅｔ）对缺血顿抑心肌的保护作用并分析与心肌ＡＴＰ酶活力的关系。方法：离体大鼠工作心脏，全心缺血３０ｍｉｎ再灌４０ｍｉｎ，无机磷显色法分析ＡＴＰ酶活力。结果：顿抑心肌收缩舒张功能均明显降低，再灌期末ＬＶＳＰ×ＨＲ仅恢复５２％±８％，ＬＶＥＤＰ抬高２９８％±６４％，ＣＯ仅恢复４０％±８％，心肌细胞膜和线粒体Ｎａ＋，Ｋ＋－ＡＴＰ酶和Ｃａ２＋，Ｍｇ２＋－ＡＴＰ酶活力均下降，Ｔｅｔ（３０ｍｇ·ｋｇ－１·ｄ－１，ｉｐ，３ｄ，１０μｍｏｌ·Ｌ－１灌流缺血全程）可使ＬＶＳＰ×ＨＲ恢复８５％±１２％，ＬＶＥＤＰ仅抬高１６６％±４４％，ＣＯ恢复７５％±１１％，心肌细胞膜及线粒体Ｎａ＋，Ｋ＋－ＡＴＰ酶和Ｃａ２＋，Ｍｇ２＋－ＡＴＰ酶活力增高。结论：Ｔｅｔ对心肌缺血后顿抑损伤有一定保护作用，这一作用与维护顿抑期心肌细胞ＡＴＰ酶活力有关。     

Responses of Cultured Astrocytes, C6 Glioma and 1321NI Astrocytoma Cells to Amyloid ��-Peptide Fragments

The effect of amyloid β-peptide (βAP), which can have both neurotrophic or neurotoxic effects on neurons and has been implicated in the pathogenesis of Alzheimer’s disease (AD), was studied on astrocytes using primary cultures and astrocyte cell lines (rat C6 glioma, human 1321NI astrocytoma cells). The cultures were exposed to 0.0005–50 μg/ml) βAP fragments 1–40, 25–35, 31–35, or 40–41 (control) for 24 hr. Some of the fragments were maintained at 37°C for 48 hr to induce aggregation and some of the cell cultures were pretreated with the differentiating agent dBcAMP before the experiments. The astrocyte responses were evaluated for lysosome activity (neutral red assay) and levels of structural proteins, glial fibrillary acidic protein, vimentin, and S-100, which are altered in the dystrophic plaques with associated astrogliosis in AD. The cells frequently responded with biphasic responses, with initial (low-dose) activation-type responses (i.e., increases of indicator compared to controls), before reductions with altered morphology (increased branching of cells) at higher concentrations. However, cell death (with EC₅₀ values) was not observed, even at the maximum concentrations of βAP fragments. The findings suggest that the astrocytes have a relatively high resistance against the βAP toxicity.     

Astrocytes Increase the Functional Expression of P-Glycoprotein in an In Vitro Model of The Blood-Brain Barrier

Purpose. To investigate the influence of astrocytes on P-glycoprotein (Pgp) expression and intracellular accumulation of Pgp substrates, separate from their net transcellular transport across the blood-brain barrier (BBB). Methods. An in vitroBBB model was used, comprising of brain capillary endothelial cells (BCEC) monolayers or BCEC co-cultured with astrocytes. Results. BCEC+astrocyte co-cultures seemed to express a higher level of Pgp compared to BCEC monolayers. Inhibition of Pgp results in an increased intracellular accumulation of Pgp substrates in both BCEC monolayers and BCEC+astrocyte co-cultures, and increased the sensitivity for vinblastine mediated disruption of the in vitro BBB (called the vinblastine exclusion assay). BCEC monolayers were more sensitive to vinblastine mediated disruption compared to BCEC+astrocyte co-cultures. In the latter, but not in BCEC monolayers, an inhibitable polar transport of Pgp substrates was only found from the brain to the blood side of the filter. Conclusions. Astrocytes increase the functional expression of Pgp in our in vitroBBB model. These results also illustrate that an important role for Pgp on the BBB is to protect the barrier against intracellular accumulation of cytotoxic BBB disrupting compounds.     

Methylamine irisolidone,a novel compound,increases total ATPase activity and inhibits apoptosis in vivo and in vitro

We propose to further research the protective effect of MMI on myocardium ischemic rat model and H9c2 cells that underwent cell apoptosis induced by hypoxia. We established the myocardium ischemic rat model via the cardiac surgical procedures in vivo and treated the model rats with different concentration of MMI. In vitro, with the pretreatment of MMI for 12 h in the model of Na₂S₂O₄-induced hypoxia injury, the H9c2 cells viability was determined by MTT assay. We found that MMI had significantly improved cardiac function of the myocardial ischemia, and significantly decreased the reactive oxygen species level. The expression of P53, Bcl-2, Bax, and caspase-9 was also induced by MMI. In vitro study revealed a concentration-dependent increase in cell viability associated with MMI pretreatment. Annexin V-FITC and PI staining results showed that MMI had a preventive effect on hypoxia-induced apoptosis in H9c2 cells. MMI also inhibited the mitochondrial membrane potential decrease and increased total ATPase activity during hypoxia in H9c2 cells. In conclusion, MMI can enhance the cardiac function in myocardial ischemic rat and increase cell viability and attenuate the apoptosis in H9c2 cells induced by hypoxia, which was associated with inhibiting MMP decreasion and increasing total ATPase activity.