大鼠脑缺血再灌注后血脑屏障超微结构的改变

目的：研究大鼠脑缺血再灌注后电镜超微结构血脑屏障的特异改变。方法：采用线栓法制成大鼠大脑中动脉闭塞（MCAO）局灶性缺血2h再灌注24h模型。利用电镜技术研究脑缺血再灌注后电镜超微结构血脑屏障的特异改变。结果：在脑微血管内皮细胞核固缩，内皮细胞连接间隙和通透性增加，有的可见连接内皮细胞的基质和基膜的完整性缺失，微血管周围胶质细胞的伪足肿胀、进行性退变，微血管腔狭窄。白毛细血管内皮细胞向管腔内伸出许多突起。结论：局灶性脑缺血再灌注后24h血脑屏障的超微结构改变，可能对血液和神经元之间的营养传递有益。这可能是代偿修复和血管再生的机制之一。     

Down regulation of cyclooxygenase-2 is involved in delayed neuroprotection by ischemic preconditioning in rats

Aim: To examine whether the prostaglandins (PGs) pathway is involved in triggering delayed neuroprotection by ischemic preconditioning (IPC) and evaluate the effects of IPC on cyclooxygenase-2 (COX-2) expression following focal cerebral ischemia and reperfusion in rats. Methods: IPC was induced by 10min of saline infusion into the left internal carotid artery with the right common carotid artery clamped at the same time. Middle cerebral artery occlusion (MCAO) and reperfusion model was prodt:ced using intraluminal filament method. Results: IPC 48h priorto MCAO significantly reduced infarct area as compared with MCAO alone. A nonselective inhibitor of COX indomethacin (3mg/kg ip) applied 1h prior to or 1h after IPC failed to affect its protective effects. IPC had no direct effect on the cortex COX-2 mRNA and protein expression 72h later, but decreased the expression of COX-2 mRNA and protein following ischemia and reperfusion insult. Conclusion: PGs pathways was not involved in triggering delayed neuroprotection by IPC, and IPC induced down-regulation of COX-2 following focal cerebral ischemia and reperfusion in rats in vivo.     

脑缺血再灌注损伤后神经细胞凋亡及Bcl-2、Bax蛋白表达与罗非昔布的影响

目的观察大鼠局灶性脑缺血再灌注损伤后脑梗死面积的变化、脑组织神经细胞凋亡、Bcl2与Bax蛋白表达以及罗非昔布的保护作用。方法线栓法制备大鼠大脑中动脉闭塞2h/再灌注24h模型,于再灌注开始时灌胃给予罗非昔布。TTC染色观察脑梗死面积,TUNEL法检测神经细胞凋亡,免疫组化法检测脑组织Bcl2和Bax蛋白表达。结果损伤侧脑组织出现明显梗死灶,神经细胞凋亡率与Bax蛋白表达均明显升高,Bcl2/Bax比值明显下降。罗非昔布1.12、2.24mg·kg-1均可明显减少脑梗死面积,2.24mg·kg-1剂量还可显著降低神经细胞凋亡率与Bax蛋白表达,增高Bcl2蛋白表达与Bcl2/Bax比值。结论选择性COX2抑制剂罗非昔布可促进Bcl2蛋白表达并减少Bax蛋白表达,上调Bcl2/Bax比值而抑制神经细胞凋亡,从而明显改善缺血再灌注引起的脑损伤。     

Hydroxysafflor yellow a protects neuron against hypoxia injury and suppresses inflammatory responses following focal ischemia reperfusion in rats

Previous data demonstrated that hydroxysafflor yellow A (HSYA), a yellow color pigments extracted from the safflower, was an effective agent against focal cerebral ischemia. In the present study we demonstrated that HSYA prevented the injury in cultured cerebral cortical neurons induced by oxygen-glucose deprivation and increased the cell viability, as shown by the inhibition of both LDH and NO efflux. Further, HSYA administered orally 3 d before middle cerebral artery occlusion has the capacity to reduce cerebral infarct size and edema after 2 h cerebral ischemia followed by 24 h reperfusion in rats, and to significantly improve neurological behavior scores. Mean while, treatment with HSYA significantly decreased both mRNA and protein levels of IL-1beta, TNF-alpha in ischemic brain tissue. These results suggested that the protection of HSYA results from, at least in part, suppression of inflammatory responses following focal ischemia reperfusion.     

缺血预处理对大鼠局灶性脑缺血再灌注损伤的影响

目的:探讨缺血预处理对大鼠局灶性脑缺血再灌注损伤的的保护作用。方法:SD大鼠60只,随机分为假手术组、模型组、预处理组。建立大鼠局灶性(MCAO)脑缺血再灌注损伤模型,预处理组24h前先行20min的缺血预处理,再缺血2h再灌注24h;假手术组不阻断血流,模型组未做缺血预处理。比较各组的神经功能评分、脑匀浆LDH、CK及MAD含量。结果:模型组神经功能障碍高于预处理组(P<0.01),模型组和预处理组大鼠脑缺血再灌注后脑匀浆LDH、CK明显低于假手术组(P<0.01),脑匀浆MAD明显高于假手术组(P<0.01),模型组大鼠脑缺血再灌注后脑匀浆LDH、CK明显低于预处理组(P<0.05),模型组大鼠脑缺血再灌注后脑匀浆MAD明显高于预处理组(P<0.05)。结论:缺血预处理对模型局灶性脑缺血再灌注损伤具有保护作用。     

油酰乙醇胺对小鼠局灶性脑缺血的保护作用

目的观察新型PPARα激动剂油酰乙醇胺(oleoyleth-anolamide,OEA)对小鼠局灶性脑缺血损伤的保护作用及特点。方法线栓法制备小鼠大脑中动脉栓塞模型诱导脑缺血。OEA(10、20、40mg·kg-1)在术前3d开始每天灌胃给药1次;或在缺血前0.5h、1h、再灌注同时、再灌后1h,各单次灌胃给予OEA40mg·kg-1。脑缺血1.5h,再灌注24h后,测定小鼠神经功能缺失评分、脑梗死体积、脑水肿等评定脑缺血损伤的指标。结果OEA(20、40mg·kg-1)术前多次给药及OEA(40mg·kg-1)缺血前0.5h或再灌注同时单次给药可明显改善小鼠神经功能损伤,减小脑梗死体积和减轻脑水肿程度,且以再灌注同时单次给药效果最为明显。结论OEA剂量及时间依赖性的保护小鼠局灶性脑缺血急性损伤,有效剂量为20mg·kg-1和40mg·kg-1,最佳治疗时间点为再灌注同时。     

乐尔脉胶囊对大鼠缺血再灌注后期大脑皮层细胞凋亡的干预作用

目的:研究乐尔脉胶囊(LEM)对大鼠局灶性脑缺血2h再灌注30d后所致大脑皮层神经细胞凋亡的干预作用。方法:以线栓阻断(MCAO)法制备大鼠右侧大脑中动脉缺血再灌注模型,分为假手术、模型、盐酸氟桂利嗪及LEM高、低剂量组;应用免疫组化、凋亡细胞原位末端标记法(TUNEL)与逆转录聚合酶链反应(RT-PCR)技术检测大鼠大脑细胞凋亡和细胞凋亡相关基因产物(Fas)、凋亡促进基因(Bax)mRNA的表达,并进行图像分析。结果:模型组凋亡细胞主要位于缺血侧大脑皮层缺血边缘区(半暗带区);缺血侧大脑皮层Fas、Bax mRNA的表达在缺血再灌注30d后仍有升高;LEM组Fas、Bax mRNA的表达显著低于模型组(P<0.01),凋亡细胞数也显著低于模型组(P<0.01)。LEM组可明显降低损伤侧脑组织Fas、Bax mRNA的表达,抑制细胞凋亡,减轻缺血再灌注对大鼠大脑皮层神经细胞的损伤。结论:LEM对大鼠脑缺血再灌注30d后的细胞凋亡有一定的干预作用。     

前胡甲素对小鼠局灶性脑缺血的保护作用

目的观察前胡甲素(Pd-Ia)对小鼠局灶性脑缺血损伤的保护作用及特点。方法线栓法制备小鼠大脑中动脉栓塞脑缺血损伤模型。Pd-Ia(1,5,10mg/kg)在缺血前0.5h腹腔给药1次;或在缺血前1,0.5h、缺血同时、再灌注同时、再灌后0.5h及再灌后1h各腹腔给予Pd-Ia5mg/kg。脑缺血1.5h,再灌注24h后,测定小鼠神经功能缺失评分、脑梗死体积、脑水肿等评定脑缺血损伤的指标;测定血清中丙二醛(MDA)和超氧化物岐化酶(SOD)的活性。结果Pd-Ia(5,10mg/kg)缺血前0.5h给药及Pd-Ia5mg/kg缺血前0.5h、缺血同时、再灌注同时及再灌后0.5h给药可明显改善小鼠神经功能损伤,减小脑梗死体积和减轻脑水肿程度,且以再灌注同时单次给药效果最为显著;Pd-Ia(5,10mg/kg)能够明显提高脑缺血损伤小鼠血清中SOD活性,降低MDA含量。结论Pd-Ia保护小鼠局灶性脑缺血急性损伤,最佳剂量为5mg/kg,最佳治疗时间点为再灌注同时;其保护脑缺血损伤的机制可能与抑制脂质过氧化、提高氧化酶的活性有关。     

白三烯受体拮抗剂ONO—1078对大鼠局灶性脑缺血的神经保护作用

AIM: To determine whether ONO-1078 (pranlukast), a potent leukotriene receptor antagonist, has neuroprotective effect on focal cerebral ischemia in the rat. METHODS: Focal cerebral ischemia was induced by 30 min of middle cerebral artery (MCA) occlusion and followed by 24 h reperfusion. ONO-1078 (0.003-1.0 mg/kg) or vehicle (saline 1 mL/kg) was ip injected 30 min before MCA occlusion and 2 h after reperfusion. The neurological score, infarct volume, neuron density (in cortex, hippocampus, and striatum), brain edema, and albumin exudation around the vessels were determined 24 h after reperfusion. RESULTS: ONO-1078 slightly improved the neurological deficiency, and dramatically decreased infarct volume and neuron loss which showed a bell shaped dose response effect with highest effect at doses of 0.01-0.3 mg/kg. Enlargement of the ischemic hemisphere and albumin exudation were inhibited at doses of 0.01-1.0 mg/kg. CONCLUSION: ONO-1078 has the protective effect on focal cerebral ischemia in rats, which is partially attributed to the inhibition of brain edema. This may represent a novel approach to the treatment of acute cerebral ischemia with cysteinyl leukotriene receptor antagonists.     

油酰乙醇胺在小鼠急性局灶性脑缺血再灌注损伤中的作用及机制

目的研究油酰乙醇胺(OEA)在脑缺血再灌注损伤中的作用及机制。方法线栓法制备小鼠大脑中动脉栓塞模型,缺血90 min后再灌注。应用HPLC-MS/MS方法测定脑组织内OEA的含量。给予OEA(5,10,40 mg/kg,ig)或OEA水解酶抑制剂URB597(1 mg/kg,ig),观察其对小鼠急性脑缺血再灌注损伤的影响。测定脑组织丙二醛(MDA)含量,超氧化物歧化酶(SOD)及过氧化氢酶(CAT)的活性。观察MK886对OEA抗脂质过氧化损伤的影响。结果脑缺血再灌注后6 h,损伤侧脑内OEA含量开始升高,再灌注后24 h升高最明显。脑缺血再灌注后给予OEA(40 mg/kg)或URB597(1 mg/kg)可减少神经功能缺失评分,减小脑梗死体积,减轻脑水肿程度。OEA可减少脑内MDA含量,增加抗氧化酶SOD的活性。OEA这一抗氧化作用可被MK886所取消。结论脑缺血再灌注可增加脑内OEA的含量,OEA通过激动PPARα,减轻脂质过氧化损伤发挥抗脑缺血再灌注损伤作用。     

Effect of late treatment with gamma-hydroxybutyrate on the histological and behavioral consequences of transient brain ischemia in the rat

It has been previously described that gamma-hydroxybutyrate (GHB) provides significant protection against transient global cerebral ischemia in the rat (four vessel occlusion model), when given 30 min before or 10 min after artery occlusion. Here, we show that in the same rat model, significant protection can also be obtained when treatment is started 2 h after the ischemic episode. In saline-treated animals, 30 min of global ischemia followed by reperfusion caused a massive loss of neurons in the hippocampal CA1 subfield (examined 63 days after the ischemic episode), and an impairment of sensory-motor performance (tested on the 51st and 63rd days after ischemia) and of spatial learning and memory (evaluated starting 46 days after the ischemic episode). Treatment with GHB--300 mg/kg intraperitoneally (i.p.) 2 h after the ischemia-reperfusion episode, followed by 100 mg/kg i.p. twice daily for the following 10 days--afforded a highly significant protection, against both histological damage and sensory-motor and learning-memory impairments. These data further suggest the possible therapeutic effectiveness of GHB in brain ischemia, and indicate that the underlying mechanism of action involves non-immediate steps of the ischemia-induced cascade of events.     

芪穹胶囊对大鼠局部脑缺血再灌注损伤的保护作用

目的探讨芪穹胶囊（QQJN）对局部脑缺血再灌注损伤的保护作用及其机制。方法采用大鼠线栓法制备局脑缺血再灌注模型,观察QQJN对神经功能评分、脑梗死百分比、脑组织病理形态学、脑组织SOD活性、MDA含量、体外血栓形成及血小板聚集的影响。结果与模型组比较,QQJN（4．4、8．8g／kg）对脑缺血再灌注8h和22h的神经功能评分有一定的降低作用,可以减少脑梗死百分比,不同程度的改善脑组织病理形态学的变化;QQJN（4．4,8．8g/kg）可以增加脑组织SOD活性,降低MDA含量,具有抑制体外血栓形成和血小板聚集等作用。结论QQJN对局脑缺血再灌注损伤具有一定的保护作用,其机制可能与抗自由基损伤、抑制血小板聚集、血栓形成等有关。     

三乙酰莽草酸对大鼠局灶性脑缺血再灌注过程中血浆血管活性物质量和脑髓过氧化物酶活性的抑制作用(英文)

目的探索血浆内血管活性物质和白细胞浸润在大鼠局灶性脑缺血再灌损伤中是否影响力不同及三乙酰莽草酸(TSA)的保护作用。方法线栓法制备大鼠大脑中动脉缺血90 min再灌注3 ~48 h模型。分别于缺血开始和缺血60 min时给予TSA 50~200 mg·kg-1ig。分别用荧光分光光度法和放射免疫法测定血浆5-羟色胺(5-HT)和血栓烷素B2(TXB2)含量,化学法测定脑皮层中髓过氧化物酶(MPO)活性。结果大鼠脑缺血再灌注3 ~24 h时血浆5-HT和TXB2含量及脑MPO活性呈时间依赖性升高,48 h后5-HT, TXB2含量降至假手术组水平,而MPO活性仍明显高于未缺血侧脑皮层。TSA(100和200 mg·kg-1)可显著抑制缺血90 min再灌注24 h时血浆5-HT和TXB2含量及脑MPO活性增高。结论大鼠局灶性脑缺血再灌注过程中血浆中血管活性物质量和脑组织中MPO活性表现出不同的时相变化,并且对脑损伤影响力不同,TSA可有效保护缺血脑组织。     

丹参酮Ⅱ-A对局灶性脑缺血大鼠COX-2、PGI2以及TXA2含量的影响

目的探讨丹参酮Ⅱ-A对局灶性脑缺血大鼠脑组织环氧化酶2(COX-2)及其下游产物含量的影响。方法 46只SD大鼠随机分为假手术(S)组(n=10)、缺血模型(I)组(n=11)和丹参酮Ⅱ-A低(T1)(n=12,丹参酮Ⅱ-A腹腔预注射1周,每日2mg/kg)、高(T2)(n=13,丹参酮Ⅱ-A腹腔预注射1周,每日4mg/kg)剂量预防组。采用持续性大脑中动脉线栓法制作局灶性脑缺血模型。持续栓塞3h后进行神经行为学评分,6h后断头取脑,干湿重法求出脑组织含水量,ELISA法测定脑组织中COX-2、6-酮前列腺素F1α(6-keto-PGF1α)、血栓素B2(TXB2)含量。结果与I组相比,T1、T2组神经功能损伤改善,脑组织含水量减少,COX-2、6-keto-PGF1α和TXB2的产生呈剂量依赖性的降低(P<0.01)。结论抑制COX-2及其下游产物TXA2、前列环素(PGI2)可能是丹参酮Ⅱ-A保护局灶性脑缺血大鼠神经功能的作用机制之一。     

Orally administered oleoylethanolamide protects mice from focal cerebral ischemic injury by activating peroxisome proliferator-activated receptor α

Oleoylethanolamide (OEA) is a high-affinity agonist of peroxisome proliferator-activated receptor α (PPARα) which may act as an endogenous neuroprotective factor. However, it is not clear whether orally administered OEA is effective against ischemic brain injury. In our study, transient focal cerebral ischemia was induced by middle cerebral artery occlusion for 90 min followed by reperfusion. To evaluate its preventive effects, OEA (10, 20 or 40 mg/kg, ig) was administered for 3 days before ischemia. To evaluate its therapeutic effects, OEA (40 mg/kg, ig) was administered at 0.5 or 1h before reperfusion or at 0 or 1h after reperfusion. In some experiments, the PPARα antagonist MK886 (10mg/kg, ig) was administered 0.5h before OEA. Neurological deficit score, infarct volume and brain edema degree were determined at 24h after reperfusion. Blood-brain barrier (BBB) disruption was evaluated by Evans blue (EB) leakage at 6h after reperfusion. Real-time RT-PCR and western blot were performed to detect PPARα mRNA and protein expression. Oral OEA pretreatment improved neurological dysfunction reduced infarct volume and alleviated brain edema in a dose-dependent manner; the most effective dose was 40 mg/kg. The therapeutic time is within 1h after reperfusion. OEA also increased PPARα mRNA and protein expression in the ischemic brain. The PPARα antagonist MK886 abolished the protective effects of OEA. In conclusion, our results indicate that orally administered OEA protects against acute cerebral ischemic injury in mice, at least in part by activating PPARα.     

ZW1-2对局灶脑缺血小鼠纹状体、皮质及海马脑区BDNF和VEGF蛋白表达的影响

目的观察化合物zome wermel 1-2(ZW1-2)对小鼠永久性局灶脑缺血后的神经功能,以及对脑源性营养因子和血管内皮生长因子的影响。方法制备小鼠永久性局灶脑缺血模型,并分别于脑缺血后2.5 h和7.5 h,灌胃给予不同剂量的化合物ZW1-2,脑缺血后24 h采用免疫组化法测定小鼠各个脑缺血易损区的脑源性神经营养因子和血管内皮生长因子表达情况。结果 ZW1-2能够显著降低小鼠局灶性脑缺血导致的行为功能评分,可以显著提高皮质、纹状体和海马脑区的脑源性神经营养因子表达,显著降低这些脑区中的血管内皮生长因子蛋白表达。结论 ZW1-2具有抗实验性脑缺血作用,其作用机制可能通过调控脑源性神经营养因子以及血管内皮生长因子而起到对脑缺血损伤的治疗作用。     

氧化苦参碱对大鼠局灶性脑缺血损伤的保护作用及其抑制凋亡的作用机制

目的探讨氧化苦参碱(oxymatrine,OMT)对大鼠局灶性脑缺血损伤的保护作用及其抑制凋亡的作用机制。方法采用大鼠永久性大脑中动脉阻塞(permanent middle cer-ebral artery occlusion,pMCAO)方法,建立脑缺血模型,大鼠pMCAO术后通过腹腔给予OMT(30、60、120 mg.kg-1),以脑梗死体积、脑含水量和行为学症状等指标评价OMT对脑缺血的神经保护作用。通过HE染色方法观察OMT对缺血皮层神经细胞的形态变化以及数目的影响;应用Westernblot法检测OMT对缺血皮层Caspase-3、Bcl-2、Bax蛋白水平的表达。结果在大鼠局灶性脑缺血体内模型中,OMT(30、60、120 mg.kg-1)可明显减小脑梗死体积、脑含水量和改善行为学体征(P<0.01)。HE染色结果提示:OMT可明显增加神经细胞的存活率改善神经细胞的形态。Western blot结果显示:与假手术组相比,大鼠pMCAO后3、6、12、24 h,缺血皮层Caspase-3、Bax蛋白的表达水平在3 h开始上升,24 h达到峰值;而Bcl-2的表达水平在3h开始下降,24 h降到最低。给予OMT后可下调pMCAO大鼠缺血皮层中Caspase-3、Bax蛋白,上调Bcl-2蛋白。结论氧化苦参碱对脑缺血损伤有直接的神经保护作用,其机制可能通过上调Bcl-2及下调Bax、Caspase-3蛋白水平抑制凋亡发生。     

Antagonistic effects of ultra-low-molecular-weight heparin against cerebral ischemia/reperfusion injury in rats.

Heparin and low-molecular-weight heparin have long been proposed for stroke treatment. This study was conducted to demonstrate the antagonistic effects of ultra-low-molecular-weight heparin (ULMWH) on cerebral ischemic injury in rats and the mechanisms underlying the effects. Male Wistar rats were subjected to middle cerebral artery occlusion (MCAO) for 2h followed by reperfusion for 24h. ULMWH (0.5, 1 mg kg(-1), i.v.) was administered after the MCAO and reperfusion. Twenty-four hours after the reperfusion, neurological deficit scores, body weight and infarct volume were assessed. Spectrophotometric assay was used to determine the activity of superoxide dismutase (SOD) and content of malondialdehyde (MDA) of the brain. Furthermore, the intracellular Ca(2+) concentration ([Ca(2+)]i) was measured. The results showed that vein injection of ULMWH at doses of 0.5 and 1.0 mg kg(-1) exerted significant neuroprotective effects on rats with focal cerebral ischemic injury via significantly decreasing neurological deficit scores, increasing body weight, reducing the infarct volume. At the same time, ULMWH significantly decreased MDA content, and increased SOD activity in ischemic brain. Compared with model group, ULMWH decreased the intracellular calcium concentration remarkably. All these findings suggest that ultra-low-molecular-weight heparin might act as a neuroprotective agent useful in the treatment in focal cerebral ischemia.     

Effects of beta-aescin on apoptosis induced by transient focal cerebral ischemia in rats.

AIM: To investigate the effects of beta-aescin on apoptosis induced by transient focal brain ischemia in rats. METHODS: Rats were pretreated with beta-aescin for 7 d and then subjected to brain ischemia/reperfusion (I/R) injury induced by a middle cerebral artery occlusion. After 2 h ischemia and 24 h reperfusion, Hematoxylin-Eosin (HE) staining, in situ end-labeling of nuclear DNA fragmentation (TUNEL) were employed to determine the level of apoptosis. The expressions of caspase-3 and Bcl-2 in the cortex were determined by immunohistochemistry and Western blot. The release of cytochrome c was analyzed by Western blot. RESULTS: The increased numbers of HE- and TUNEL-positive staining cells were significantly observed at 24 h after reperfusion. The immunoreactivity was inhibited by beta-aescin (30, 60 mg/kg) (P<0.01 or P<0.05 vs vehicle-treated). After cerebral I/R, cytochrome c was released into the cytosol and caspase-3 was activated, whereas Bcl-2 expression was inhibited. beta-Aescin (30, 60 mg/kg) markedly inhibited the expression of caspase-3 and the release of cytochrome c, and up-regulated the expression of Bcl-2 (P<0.05, P<0.01 vs vehicle-treated). CONCLUSION: beta-Aescin could potently inhibit caspase-3 activation and the release of cytochrome c, increasing the expression of Bcl-2 after cerebral I/R in rats. These findings on the inhibitory effects of beta-aescin on brain ischemic injury-induced apoptosis might have important theoretical basis for the treatment on ischemic cerebrovascular diseases.     

COX-2抑制剂对大鼠局灶性脑缺血再灌注损伤的保护作用研究

目的观察选择性环氧合酶2(cyclooxygenase2,COX2)抑制剂尼美舒利(nimesulide)对大鼠局灶性脑缺血/再灌注损伤后神经功能缺陷、脑梗死体积及前列腺素E2(PGE2)含量的影响。方法用线栓法制作大鼠脑缺血/再灌注损伤模型,动物分别于缺血前30min、再灌注后6h、12h给予3个不同剂量尼美舒利(3、6和12mg/kg,ip)或等体积的溶媒。于再灌注后6、12、24h进行神经功能评分;采用TTC染色法测定脑梗死体积;应用ELISA法检测PGE2含量。结果尼美舒利呈剂量依赖性减少脑梗死体积并改善功能预后,与溶媒组比较有显著性差异;各尼美舒利治疗组脑梗死后PGE2含量和溶媒组相比显著降低。结论尼美舒利对缺血性脑损伤具有明显的保护作用,其保护作用可能与通过减少花生四烯酸环氧酶途径的代谢产物,从而抑制脑缺血后的炎症反应有关。