磷酸二酯酶4抑制剂咯利普兰逆转慢性酒精中毒及戒断诱导的小鼠抑郁样行为

目的:研究磷酸二酯酶4(PDE4)抑制剂咯利普兰对酒精中毒戒断诱导的抑郁样行为的作用及对小鼠海马和前额叶皮质脑区环磷酸腺苷(cAMP)、蛋白激酶A(PKA)、cAMP反应元件结合蛋白(CREB)、磷酸化CREB(p-CREB)和脑源性神经营养因子(BDNF)表达的影响。方法:取60只雄性ICR小鼠,随机分为空白对照组、空白+咯利普兰组、慢性酒精模型组和咯利普兰治疗组(0.1、0.5和1 mg/kg)。给予酒精28 d期间每周进行酒精戒断处理。慢性酒精处理后,进行强迫游泳测试(FST)和悬尾测试(TST),观察小鼠抑郁样行为;ELISA检测小鼠海马和前额叶皮质cAMP含量,Western blot检测小鼠海马和额叶皮质PKA、CREB、p-CREB和BDNF的表达。结果:随着饮酒天数及戒断次数的增加,小鼠表现出明显嗜酒现象,饮酒量增加(P0.01),FST和TST测试中的不动时间增加(P0.01)。小鼠给药咯利普兰(0.5和1 mg/kg)28 d后,FST和TST不动时间与模型组相比明显减少(P0.05),且能改善小鼠的嗜酒现象,小鼠饮酒量与模型组相比明显减少(P0.01);相比于正常组,模型组小鼠海马和前额叶皮质cAMP含量明显降低(P0.01),并且海马和额叶皮质PKA、p-CREB和BDNF也明显低于正常水平(P0.01)。咯利普兰(0.5和1 mg/kg)给药28 d后,海马与前额叶皮质cAMP含量明显增加(P0.01),酒精抑制的海马脑区PKA、p-CREB和BDNF表达被逆转(P0.05),且酒精抑制的前额叶皮质PKA和p-CREB表达被逆转(P0.05)。结论:磷酸二酯酶4抑制剂咯利普兰能明显改善酒精中毒及戒断引起的抑郁样症状,且能减轻嗜酒症状,机制可能涉及第二信使cAMP通路。咯利普兰通过抑制PDE4,增加海马与前额叶皮质cAMP水平,进而激活PKA-CREB-BDNF通路,从而产生抗抑郁作用。     

足底电击应激对小鼠脑组织神经递质水平变化的影响

目的:分析足底电击应激对小鼠前额叶皮层、海马、杏仁核神经递质的影响。方法:选择健康雌性成年C57BL/6J小鼠,随机分为对照组和足底电击应激组。应激组给予不可逃避足底电击,隔日1次,持续14d。足底电击应激结束次日进行糖水偏爱实验评估小鼠抑郁样行为;提取小鼠前额叶皮层、海马、杏仁核,试剂盒检测谷氨酸和γ-氨基丁酸(GABA)含量,高效液相色谱方法检测去甲肾上腺素(NE)和5-羟色胺(5-HT)含量。结果:与对照组相比,足底电击应激小鼠糖水偏爱指数明显降低;足底电击应激小鼠杏仁核谷氨酸水平显著升高、前额叶皮层及海马GABA水平显著下降;前额叶皮层、海马谷氨酸及杏仁核GABA表达水平无显著差异;足底电击应激小鼠前额叶皮层5-HT、杏仁核NE水平显著升高;前额叶皮层、海马NE,以及海马、杏仁核5-HT表达水平无显著差异。结论:足底电击应激引起小鼠抑郁样行为,上调杏仁核谷氨酸、NE以及前额叶皮层5-HT的表达,下调前额叶皮层、海马GABA的表达。     

解郁丸对WKY大鼠的抑郁样行为及海马和前额叶皮层BDNF表达的影响

目的:观察解郁丸对Wistar-Kyoto(WKY)大鼠抑郁样行为及脑源性神经营养因子(BDNF)在海马和前额叶皮层表达的影响,探讨其抗抑郁作用及相关机制。方法:成年雄性WKY大鼠为内源性抑郁动物模型,选取同品系Wistar大鼠作为空白对照组,WKY大鼠随机分为模型组、西酞普兰组和解郁丸组,分别灌胃给药21 d后,用糖水偏好实验及强迫游泳实验观察各组大鼠抑郁行为变化;采用免疫荧光法和Western blot法检测海马及前额叶皮层BDNF表达水平的变化。结果:WKY大鼠表现出明显的抑郁样行为,海马及前额叶皮层的BDNF表达量显著下降,且海马区神经元轴突减少(P0.01);在药物治疗后,WKY大鼠的抑郁样行为明显减少,BDNF在海马及前额叶皮层中的表达增加,且轴突数目也增加(P0.01)。结论:解郁丸能有效减少WKY大鼠的抑郁样行为;BDNF是其抗抑郁作用发挥的关键因子。本研究也进一步验证BDNF参与抑郁的发生发展过程。     

慢性间歇性缺氧对阻塞性睡眠呼吸暂停低通气综合征模型大鼠抑郁的影响及机制

目的:通过建立具有阻塞性睡眠呼吸暂停低通气综合征(obstructive sleep apnea-hypopnea syndrome,OSAHS)病理生理特性的慢性间歇性缺氧(chronic intermittent hypoxia,CIH)动物模型,研究CIH对大鼠抑郁状态的影响及可能机制。方法:设立空白对照组(CON),慢性间歇性缺氧模型组(CIH)和缺氧后复氧组(RH),每组SD大鼠8只。PET/CT脑部显像观察代谢水平,糖水偏好实验、旷场实验、强迫游泳实验评价抑郁状态,电镜下观察海马CA1区突触形态、数量,酶联免疫法(ELISA)测量海马区PSD-95、BDNF、5-HT、DA、NE含量。结果:与CON组相比,CIH组旷场实验中央活动路程比降低(P0.05),强迫游泳不动时间延长(P0.05),电镜下突触数量减少(P0.05),海马组织5-HT、NE、BDNF、PSD-95表达水平下降(P0.05,P0.01);RH组中央活动路程比降低(P0.05),海马组织5-HT、BDNF表达下降(P0.05)。与CIH组相比,RH组大鼠海马组织5-HT含量增高(P0.05)。结论:CIH可一定程度增加抑郁的发生风险,机制可能与海马区5-HT、BDNF表达水平降低和突触可塑性改变有关。纠正缺氧可部分改善神经损伤。     

三种中药复方对慢性束缚应激大鼠皮层和海马BDNF、TrkB的影响

目的： 研究慢性束缚应激时大鼠皮层和海马BDNF、TrkB的变化以及逍遥散、四君子汤、金匮肾气丸3种中药复方对其影响。方法： 用特制束缚架连续束缚7 d与21 d，每天3 h的方法制作大鼠束缚应激模型，用免疫组织化学方法结合图像分析检测大鼠皮层和海马CA1区BDNF、TrkB的变化。结果： 连续束缚7 d、21 d后大鼠大脑额叶皮层与海马CA1区的BDNF均显著低于正常对照组（P<0.05, P<0.01）,尤以21 d模型组明显。连续束缚7 d、21 d后大鼠大脑额叶皮层与海马CA1区的TrkB分别显著高于正常对照组（P<0.05，P<0.01）。3个中药复方均能升高皮层BDNF的积分吸光度和海马中BDNF的阳性细胞数；逍遥散能降低海马和皮层中的TrkB阳性细胞数和海马TrkB的积分吸光度；四君子汤和金匮肾气丸能降低皮层TrkB的积分吸光度；金匮肾气丸能降低皮层TrkB的阳性细胞数；逍遥散升高皮层和海马中BDNF的作用比四君子汤和金匮肾气丸明显。结论： 皮层和海马CA1区BDNF下降参与慢性应激的变化，疏肝、健脾、补肾的中药复方均有一定程度的逆转作用，但以逍遥散的作用较强，优于四君子汤和金匮肾气丸。     

气味对小鼠学习记忆能力及海马cAMP反应元件结合蛋白的影响

目的:探讨不同气味(苹果、香水、樟脑)对小鼠学习记忆能力及海马cAMP反应元件结合蛋白(CREB)和磷酸化的CREB(pCREB)的影响。方法:让小鼠在不同气味的环境下生活14d,在第7d开始方形水迷宫训练,3d后进行测试,连续测试5d。测试完后断髓处死动物,取出脑组织,用免疫组织化学染色观察海马pCREB和CREB表达情况,并进行图像分析。结果:樟脑组和香水组水迷宫的潜伏期较对照组延长,错误次数增多(P＜0.05)。免疫组化染色显示鼠海马CREB的磷酸化水平大大降低(P＜0.05),但对CREB的表达无明显影响。苹果组与对照组比各指标均无显著差异(P＞0.05)。结论:樟脑气味和香水气味对小鼠记忆能力有负面作用,且这种作用可能是通过降低CREB磷酸化水平而实现的。苹果气味对小鼠记忆能力无明显影响。     

mBDNF/Akt/CREB和proBDNF/RhoA信号传导失衡在丙泊酚致新生鼠认知功能障碍的作用

目的探讨m BDNF/Akt/CREB和pro BDNF/Rho A信号传导失衡在丙泊酚致新生鼠认知功能障碍的作用。方法新生7 d大鼠随机分为6组(每组n=12):C组连续7 d腹腔注射0.9%氯化钠溶液;P1组注射0.9%氯化钠溶液6d后,第7天注射丙泊酚;P2组连续7 d注射丙泊酚;T、K及D组连续7 d注射丙泊酚后,第7天再分别注射TATPep5、K252a与DMSO。各组随机抽取6只大鼠进行血糖血气的监测,其余大鼠喂养至第25天进行Morris水迷宫实验,测试空间学习记忆能力。取海马组织,通过Western blot检测m BDNF/Akt/CREB及pro BDNF/Rho A信号通路的表达。结果与C组比较,P1组与P2组大鼠幼年期逃逸潜伏期延长,空间探索时间缩短(P0.05),且P2组改变更为显著。与D组比较,K组大鼠幼年期逃逸潜伏期延长,空间探索时间缩短(P0.05);T组大鼠幼年期逃逸潜伏期缩短,空间探索时间延长(P0.05)。与C组比较,P1组与P2组海马m BDNF/Akt/CREB表达下调(P0.05),且P2组下调更为显著;P1组与P2组海马pro BDNF/Rho A表达上调(P0.05),且P2组上调更为显著。与D组比较,K组海马Akt/CREB下调(P0.05),T组海马Rho A下调(P0.05)。结论丙泊酚导致新生大鼠幼年期学习记忆功能障碍与m BDNF/Akt/CREB抗凋亡信号通路抑制,pro BDNF/Rho A促凋亡信号通路增强有关。     

葛根素对围绝经期抑郁症模型小鼠的神经保护作用及机制研究

目的:探讨葛根素对围绝经期抑郁症模型小鼠行为影响及神经生物学机制。方法:清洁级昆明小鼠饲养1周以适应环境。旷场实验(OFT)筛选后,随机分为假手术组、围绝经期抑郁症模型组、氟西汀组(FLU,3mg/kg)、雌激素组(E,0.15 mg/kg)和葛根素组(92 mg/kg),每组10只。采用小鼠双侧卵巢切除(OVX)联合慢性不可预知性温和应激(CUMS)法建立围绝经期抑郁症动物模型。各给药组于每日应激前1 h灌胃给药,其余各组给予等体积生理盐水,共计21 d。观察小鼠动情周期变化,测定行为学变化,观察海马组织形态学改变,测定脑组织单胺类递质含量,测定海马组织c AMP反应元件结合蛋白(CREB)-脑源性神经营养因子(BDNF)信号通路主要蛋白表达。结果:与假手术组比较,各OVX组小鼠连续7 d内连续监测未见动情周期变化,证明去势成功;围绝经期抑郁症模型组小鼠呈现抑郁样行为,表现为自发活动及探索行为减少、行为绝望时间增加、体质量增长缓慢(P0.01或P0.05),海马神经元损伤、萎缩、数量减少、尼氏体减少及早期凋亡变化,脑组织五羟色胺(5-HT)、去甲肾上腺素(NE)及多巴胺(DA)含量减少(P0.01);海马组织CREB-1、磷酸化c AMP反应元件结合蛋白(p-CREB-1)、BDNF及酪氨酸蛋白激酶B(Trk B)蛋白表达减少(P0.01)。与围绝经期抑郁症模型组比较,给予葛根素(Pue)治疗后,可改善围绝经期抑郁症模型小鼠抑郁样行为,表现为增加自发活动及探索行为、减少行为绝望时间、体质量增加迅速(P0.01或P0.05);减轻海马组织神经元损伤及凋亡细胞,增加脑组织5-HT、NE及DA含量(P0.01),增加海马组织CREB-1、p-CREB、BDNF及Trk B蛋白表达(P0.01),差异具有统计学意义。结论:采用小鼠双侧OVX联合CUMS可成功制备围绝经期抑郁症动物模型。葛根素具有神经保护及抗围绝经期抑郁症作用,其机制主要通过减轻海马神经元损伤、抑制神经元早期凋亡、增加脑组织单胺类递质含量及上调脑组织CREB-BDNF信号通路主要蛋白表达而发挥的。     

慢性间歇低氧对幼鼠认知及相关脑区CREB的影响

目的:观察慢性间歇低氧(CIH)对幼鼠认知的影响并探讨其潜在的机制。方法:取八臂迷宫训练成功的SPF级健康雄性SD幼鼠40只,随机分为:间歇低氧2周(2IH)、4周组(4IH),对照2周(2C)、4周组(4C),建立IH幼鼠模型,低氧结束后进行八臂迷宫测试,观察海马和前额叶皮层超微结构变化及cAMP反应元件结合蛋白(CREB)mRNA和磷酸化CREB蛋白的表达。结果:4组幼鼠的记忆错误次数比较均有显著差别(均P0.05);IH各组海马及前额叶皮层神经元均出现早期凋亡和变性,尤以4IH组最为明显,对照组则基本正常;与相应对照组相比,2IH、4IH组幼鼠海马和前额叶皮层CREB mRNA和p-CREB蛋白的表达水平显著降低(均P0.05),且以4IH组最低(均P0.01),差异显著,两对照组之间无显著差异(P0.05)。结论:慢性间歇低氧诱导海马和前额叶皮层神经元超微结构改变,还下调CREB的基因转录和抑制CREB蛋白磷酸化,抑制记忆相关蛋白的合成,这可能是引起学习记忆能力下降的重要机制之一。     

米诺环素对CCI大鼠抑郁样行为的影响及机制研究

目的:观察海马CA1区注射米诺环素对坐骨神经慢性缩窄性损伤(CCI)大鼠的抑郁样行为、海马和前额叶皮层小胶质细胞激活的影响并分析其机制。方法:成年SD雄性大鼠随机分为:对照组、假手术组、CCI模型组、CCI+米诺环素组。糖水偏好及旷场实验检测大鼠抑郁样行为;免疫组化观察海马以及前额叶皮层Iba-1表达;取海马以及前额叶皮层组织,real-time PCR观察Iba-1、NLRP3和caspase1 mRNA表达,ELISA测定IL-1β和IL-18含量。结果:与假手术组相比,CCI大鼠7、10 d和14 d的糖水偏好明显降低(P 0. 05),旷场中央活动距离和中央活动时间明显减少(P 0. 05);与CCI组相比,CA1区注射米诺环素后CCI大鼠7 d和14 d的糖水偏好明显升高(P 0. 05),旷场中央活动距离和中央活动时间明显增加(P 0. 05)。与假手术组相比,CCI组大鼠海马CA1、CA3及DG区和前额叶皮层Iba-1阳性细胞数目显著增多(P 0. 05),Iba-1、NLRP3和caspase1 mRNA表达明显上调; IL-1β和IL-18含量也明显升高(P 0. 05)。与CCI组相比,注射米诺环素后,CCI大鼠海马CA1、CA3及DG区和前额叶皮层Iba-1阳性细胞数目减少(P 0. 05),Iba-1、NLRP3和caspase1 mRNA表达降低(P 0. 05),IL-1β和IL-18含量降低(P 0. 05)。结论:海马CA1区注射米诺环素明显抑制CCI大鼠的抑郁样行为;其机制可能是抑制海马和前额叶皮层小胶质细胞激活,下调NLRP3和caspase1表达,从而使IL-1β和IL-18产生减少。     

Fluoxetine treatment induces dose dependent alterations in depression associated behavior and neural plasticity in female mice

Antidepressant-induced increases in neurogenesis and neurotrophin mobilization in rodents and primates are proposed to be necessary for behavioral efficacy. The current study examines the relationship between the effects of fluoxetine treatment on behavior, cell proliferation and the neurotrophin BDNF in females. Female MRL/MpJ mice were treated acutely (5 and 10 mg/kg) or chronically (2.5, 5 and 10 mg/kg b.i.d.) with fluoxetine and tested in the tail suspension test (TST) and or novelty-induced hypophagia test (NIH), respectively. Mice treated chronically with fluoxetine received 4 (100 mg/kg) injections of 5-bromo-2′-deoxyuridine (BrdU) on the last 4 days of treatment to measure DNA synthesis. The other half of the hippocampus and the frontal cortex was removed and examined for BDNF levels. Fluoxetine treatment decreased immobility in the TST and latency to eat in the NIH test, but only the highest dose of fluoxetine significantly altered behavior in both tests. Chronic treatment with 5 and 10 mg/kg of fluoxetine significantly increased cell proliferation and BDNF levels in the hippocampus. Only chronic treatment with the highest of fluoxetine increased BDNF levels in the frontal cortex. Behavioral measures in the NIH test correlated with BDNF levels in the frontal cortex but not in the hippocampus or with cell proliferation in the hippocampus. These data suggest that females require high doses of fluoxetine for behavioral efficacy regardless of elevations of neurogenesis and BDNF mobilization in the hippocampus. Elevations in BDNF levels in the frontal cortex are related to the behavioral efficacy of fluoxetine.     

Autoradiographic analysis of 5-hydroxytryptamine 5-HT2A binding sites in the rat brain after chronic intragastric ethanol treatments

Several evidences indicate altered regulation of brain serotonergic mechanisms in alcohol abuse; changes in 5-HT2A receptor density and functioning have been observed in several lines of alcohol-preferring rats. Using quantitative autoradiography, the present study investigated the influence of chronic intragastric ethanol treatment on forebrain 5-HT2A binding sites in rats. Administration for 7 days of high doses of ethanol, which induced physical dependence, lowered the levels of 5-HT2A binding sites in the cingulate cortex, the frontal cortex and in the agranular insular cortex. The effect was observed immediately after the last ethanol administration, was statistically significant 14 h later, when marked withdrawal signs were observed, and remained significant after 8 days of detoxification, when withdrawal signs were no longer evident. No significant differences were detected in the claustrum, parietal cortex, piriform cortex, caudate putamen, olfactory tubercle, nucleus accumbens, shell and core. Chronic treatment with 6 g/kg of ethanol, which did not induce dependence, did not modify 5-HT2A binding sites. These long-lasting changes in brain 5-HT2A binding sites observed in the present study might contribute to specific aspects of ethanol dependence, such as development of depression and alcohol craving.     

Curcumin reverses corticosterone-induced depressive-like behavior and decrease in brain BDNF levels in rats

A rat model of depression has been recently developed using exogenous corticosterone (CORT) administration. This study aimed to examine the antidepressant-like effect and the possible mechanisms of curcumin in a CORT-induced depression model in rats. The results showed that 3-week CORT injections caused depression-like behavior in rats, as indicated by the significant decrease in sucrose consumption and increase in immobility time in the forced swim test. Repeated CORT injections also significantly decreased brain-derived neurotrophic factor (BDNF) protein levels in the hippocampus and frontal cortex of the rats. Treatment of the rats with curcumin significantly suppressed the depression-like behavior and the decrease in brain BDNF levels induced by the repeated CORT injections. The results suggest that curcumin produces an antidepressant-like effect in CORT-treated rats, which is possibly mediated by increasing BDNF expression in the hippocampus and frontal cortex.     

GSK650394对慢性应激抑郁症模型大鼠行为及海马神经营养的调节作用

目的探讨血清和糖皮质激素调节蛋白激酶1(SGK1)抑制剂GSK650394对抑郁症模型大鼠抑郁样行为及海马神经营养的调节作用。方法将SD大鼠随机分为对照组、抑郁模型(慢性温和不可预见性应激加孤养)组、GSK650394(2.8 g/L,按1 mL/kg腹腔注射)干预组;采用强迫游泳、糖水消耗、Morris水迷宫实验观察模型动物的情绪行为变化;用ELISA检测大鼠海马血浆和血清中皮质酮(CORT)、5-羟色胺(5-HT)、去甲肾上腺素(NE)含量;用Western blot检测海马中脑源性神经营养因子(BDNF)、神经营养素3(NT-3)、神经生长因子(NGF)的表达。结果与对照组比较,模型组大鼠蔗糖水偏食度显著降低、游泳不动时间增加(P<0.01)、逃避潜伏期(EL)、目标象限的潜伏时间(Lat.T)均显著延长(P<0.05或P<0.01);血浆CORT显著升高(P<0.01)、血清5-HT、NE和海马NT-3、BDNF、NGF表达显著降低(P<0.05或P<0.01)。与模型组比较,GSK650394可显著增加蔗糖水偏食度、降低游泳不动时间(P&l...     

慢性酒精中毒对大鼠学习记忆功能和脑组织内CaN和Tau-Thr~(231)的影响

建立慢性酒精中毒致大鼠学习记忆障碍模型,通过免疫组织化学法检测大鼠大脑皮层、海马和丘脑内钙神经素(calci-neurin,CaN)和Tau蛋白Thr231位点(Tau-Thr231)的分布与表达,探讨其在慢性酒精中毒致大鼠学习记忆障碍发病机理中的作用。成年雄性SD大鼠随机平均分为对照组和染毒组。对照组大鼠以生理盐水灌胃,染毒组则以55%酒精灌胃。运用Morris水迷宫检测大鼠学习记忆功能损伤情况,免疫组织化学法检测大脑皮层、海马和丘脑CaN和Tau-Thr231分布及表达,并测定CaN和Tau-Thr231免疫阳性细胞数。慢性酒精中毒后大鼠学习记忆功能有不同程度损伤。染毒组大脑皮层和海马CaN表达较对照组上调(P<0.05);染毒组大脑皮层和海马Tau-Thr231表达较对照组下调(P<0.05)。丘脑未见CaN表达,对照组丘脑可见Tau-Thr231免疫阳性细胞分布,染毒组Tau-Thr231免疫阳性细胞数量逐渐减少,提示慢性酒精中毒致大鼠学习记忆功能损伤可能与大鼠大脑皮层、海马和丘脑内CaN和Tau-Thr231的表达变化相关。     

Changes in 5-HT2A-mediated behavior and 5-HT2A- and 5-HT1A receptor binding and expression in conditional brain-derived neurotrophic factor knock-out mice

Changes in brain-derived neurotrophic factor (BDNF) expression have been implicated in the etiology of psychiatric disorders. To investigate pathological mechanisms elicited by perturbed BDNF signaling, we examined mutant mice with central depletion of BDNF (BDNF^2L/2LCk-cre). A severe impairment specific for the serotonin 2A receptor (5-HT_2AR) in prefrontal cortex was described previously in these mice. This is of much interest, as 5-HT_2ARs have been linked to neuropsychiatric disorders and anxiety-related behavior. Here we further characterized the serotonin receptor alterations triggered by BDNF depletion. 5-HT_2A ([³H]-MDL100907) and 5-HT_1A ([³H]-WAY100635) receptor autoradiography revealed site-specific alterations in BDNF mutant mice. They exhibited lower 5-HT_2A receptor binding in frontal cortex but increased binding in hippocampus. Additionally, 5-HT_1A receptor binding was decreased in hippocampus of BDNF mutants, but unchanged in frontal cortex. Molecular analysis indicated corresponding changes in 5-HT_2A and 5-HT_1A mRNA expression but normal 5-HT_2C content in these brain regions in BDNF^2L/2LCk-cre mice. We investigated whether the reduction in frontal 5-HT_2AR binding was reflected in reduced functional output in two 5-HT_2A-receptor mediated behavioral tests, the head-twitch response (HTR) and the ear-scratch response (ESR). BDNF^2L/2LCk-cre mutants treated with the 5-HT_2A receptor agonist (±)-2,5-dimethoxy-4-iodoamphetamine (DOI) showed a clearly diminished ESR but no differences in HTR compared to wildtypes. These findings illustrate the context-dependent effects of deficient BDNF signaling on the 5-HT receptor system and 5-HT_2A-receptor functional output.     

茶多酚预防慢性酒精中毒对精子损伤的作用及机制研究

目的　探讨茶多酚预防慢性酒精中毒对精子损伤的作用及其可能机制。 方法　40只雄性小鼠随机分为4组：酒精损伤组（CA组）、茶多酚低剂量组（TP-L组）及茶多酚高剂量组（TP-H组）每天先喂服酒精,8 h后再分别喂服纯水、或浓度为1%或2%的茶多酚悬液。正常对照组（NC组）以同样方式和剂量每天2次喂服纯水。90 d后取材制备精子悬液用于精子密度、精子活动率及畸形率的检测。同时,取睾丸组织行免疫组织化学检测Bcl-2和Bax的表达。 结果　与NC组比较, CA组的精子密度和精子活动率明显下降,精子畸形率明显增加。相对于CA组,TP-L组及TP-H组精子密度和精子活动率增高, 精子畸形率降低,其中TP-H组的效果比TP-L组更显著。CA组睾丸组织中Bcl-2的阳性细胞比NC组显著减少,Bax的阳性率却明显升高。喂服茶多酚却能明显逆转由酒精导致的上述变化。 结论　茶多酚能预防酒精对精子的损伤,这可能与精子发生过程Bcl-2及Bax的表达变化有关。