短发夹RNA对大鼠阴茎海绵体平滑肌细胞磷酸二酯酶5型基因表达的抑制作用

目的 观察短发夹RNA(shRNA)对大鼠阴茎海绵体平滑肌细胞磷酸二酯酶5型(PDE5)基因表达的抑制作用,探讨运用RNA干扰(RNAi)技术治疗勃起功能障碍(ED)的可行性.方法 构建靶向大鼠PDE5基因的shRNA重组腺病毒rAd-rPDE5-shRNA,将其转染大鼠阴茎海绵体平滑肌细胞48 h后,通过荧光标签进行显微计数确定转染效率,并以逆转录-聚合酶链反应(RT-PCR)及Western blot检测PDE5基因的表达水平.结果 rAd-rPDE5-shRNA构建成功,转染大鼠阴茎海绵体平滑肌细胞效率达95%以上,并使PDE5基因表达在mRNA水平抑制(80.78±2.30)%,在蛋白水平抑制(67.39±3.33)%.结论 以腺病毒为载体表达的shRNA能稳定、有效地抑制大鼠阴茎海绵体平滑肌细胞PDE5基因的表达.     

靶向人PDE5A3基因的shRNA对人阴茎海绵体平滑肌细胞cGMP的影响

目的:观察腺病毒载体介导特异性短发夹RNA(shRNA)对人阴茎海绵体平滑肌细胞环磷酸鸟苷(cGMP)的影响,为应用RNA干扰(RNAi)技术治疗阴茎勃起功能障碍(ED)提供实验依据。方法:成功构建携带3条针对人PDE5A3基因位点特异性shRNA的重组腺病毒(rAd5-shRNA-PDE5A3),并设立阴性对照病毒组和空白对照组,分别转染人阴茎海绵体平滑肌细胞。以放射免疫法分别检测转染重组腺病毒24、48、72h后细胞内cGMP浓度变化,观察rAd5-shRNA-PDE5A3对海绵体平滑肌细胞内cGMP的影响。结果:实验组rAd5-shRNA-PDE5A3转染人阴茎海绵体平滑肌细胞后胞内cGMP水平显著高于阴性对照组和空白对照组,在转染后72h最为显著。结论:3条特异性针对人PDE5A3mRNA靶位点的shRNA可有效地增加海绵体平滑肌细胞内cGMP的水平,增强对PDE5基因的阻抑效果。     

血管活性肠多肽基因转导增强阴茎勃起功能

目的 探讨阴茎海绵体勃起神经递质血管活性肠多肽(VIP)基因转导入糖尿病大鼠阴茎海绵体并表达多量VIP以增强勃起功能的可行性.方法 将构建的重组质粒pcDNA3/VIPcDNA注射入链尿佐菌素诱导的糖尿病大鼠阴茎海绵体,在注射3 d后测定阴茎海绵体内压(ICP),分别以正常空白、空白、单纯注射缓冲液和单纯注射pcDNA3载体对照.Dot blot法测定阴茎组织中VIP mRNA表达水平.结果 糖尿病大鼠阴茎海绵体注射重组质粒后3 d,电刺激海绵体神经,ICP较对照组明显升高(P＜0.05);阴茎组织VIP mRNA表达增多(P＜0.05).结论 成功将重组质粒pcDNA3/VIP cDNA转导入糖尿病阴茎海绵体,VIP mRNA表达增加能增强糖尿病大鼠阴茎海绵体的勃起功能.     

大鼠衰老过程中勃起功能改变与去乙酰化酶SIRT1的关系研究

目的:研究衰老过程中大鼠勃起功能变化、抗衰老蛋白SIRT1表达及其相关因子改变,探索SIRT1与老年性勃起功能障碍(ED)发生的关系。方法:SD大鼠按不同月龄分组,利用电刺激大鼠盆腔星状神经节法测定阴茎海绵体内压(ICP),颈动脉穿刺测定平均动脉压(MAP),ICP/MAP作为勃起功能的评价指标;马松染色观察胶原纤维变化;Western印迹测定不同月龄大鼠阴茎海绵体中SIRT1、P53及FOXO3a的表达变化;NO、c GMP检测试剂盒测定阴茎海绵体中NO、c GMP含量。结果:随月龄增长,大鼠勃起功能(ICP/MAP)在8月龄达到峰值,其后随月龄增长降低。c GMP含量变化与勃起功能一致。随月龄增加,大鼠阴茎海绵体中胶原纤维增多。SIRT1的表达随月龄增加不断降低;而凋亡因子P53、氧化应激因子FOXO3a的表达随月龄增加不断上升。结论:NO/c GMP通路活性降低、凋亡及氧化应激可能是衰老导致ED的原因。抗衰老蛋白SIRT1与其调控的凋亡、氧化应激因子改变与勃起功能一致,推测SIRT1与老年性ED的发病有关。     

靶向人PDESA3基因的shRNA对人阴茎海绵体平滑肌细胞cGMP的影响

目的：观察腺病毒载体介导特异性短发夹RNA（shRNA）对人阴茎海绵体平滑肌细胞环磷酸鸟苷（cGMP）的影响,为应用RNA干扰（RNAi）技术治疗阴茎勃起功能障碍（ED）提供实验依据。方法：成功构建携带3条针对人PDESA3基因位点特异性shRNA的重组腺病毒（rAd5-shRNA-PDE5A3）,并设立阴性对照病毒组和空白对照组,分别转染人阴茎海绵体平滑肌细胞。以放射免疫法分别检测转染重组腺病毒24、48、72h后细胞内cGMP浓度变化,观察rAd5-shRNA-PDE5A3对海绵体平滑肌细胞内cGMP的影响。结果：实验组rA（15-shRNA-PDE5A3转染人阴茎海绵体平滑肌细胞后胞内cGMP水平显著高于阴性对照组和空白对照组,在转染后72h最为显著。结论：3条特异性针对人PDE5A3mRNA靶位点的shRNA可有效地增加海绵体平滑肌细胞内cGMP的水平,增强对PDE5基因的阻抑效果。     

腺病毒载体介导shRNA抑制大鼠阴茎海绵体平滑肌细胞PDE5基因表达的研究

磷酸二酯酶5型(PDE5)作为基因治疗勃起功能障碍(ED)的分子靶点目前已逐渐成为研究热点.我们构建了以大鼠PDE5(rPDE5)为靶基因的重组腺病毒表达载体,将重组腺病毒转染大鼠阴茎海绵体平滑肌细胞后,通过细胞内转录产生的短发夹RNA(shRNA)来诱导针对rPDE5基因的RNA干扰(RNAi),并分别从mRNA和蛋白水平检测其对rPDE基因表达的抑制情况.现报告如下.     

应用RNA干扰技术抑制PDE5A3基因在人阴茎海绵体平滑肌细胞表达

目的应用RNA干扰(RNAi)技术抑制人阴茎海绵体平滑肌细胞PDE5A3基因的表达,探讨应用该技术治疗勃起功能障碍(ED)的可行性.方法构建6个靶向人PDE5A3基因的短发夹RNA(shRNA)重组质粒,转染人阴茎海绵体平滑肌细胞48 h后,逆转录-聚合酶链反应(RT-PCR)及Western blot检测PDE5A3基因的表达抑制效果.结果抑制率最高的1、2、4号重组质粒使PDE5A3基因表达在mRNA水平分别抑制(66.26±4.02)%,(54.90±3.06)%,(23.83±3.61)%;在蛋白质水平分别抑制(64.14±3.32)%,(49.21±2.96)%,(29.85±4.91)%.结论RNAi能明显抑制人阴茎海绵体平滑肌细胞PDE5A3基因的表达,且抑制率具有序列相关性,是潜在的ED基因治疗新方法.     

腺病毒载体介导PDE5-shRNAs对大鼠阴茎海绵体平滑肌细胞游离钙的影响

目的:观察腺病毒载体介导的PDE5-shRNAs对大鼠阴茎海绵体平滑肌细胞游离钙的影响,探讨利用RNAi技术治疗勃起功能障碍(ED)的可行性。方法:利用构建的携带2条靶向PDE5 mRNA靶位点的shRNAs重组腺病毒转染大鼠阴茎海绵体平滑肌细胞,同时设立阴性对照组和空白对照组,于转染后24、48、72 h用钙离子荧光探针Fluo-3/AM进行染色,然后在激光扫描共聚焦显微镜下动态检测细胞内钙离子荧光强度,以平均荧光指数(FI)反映细胞内游离钙的相对水平。结果:实验组在转染PDE5-shRNAs重组腺病毒24、48、72 h后钙离子荧光指数分别为829.3±7.8、801.5±9.5、856.3±8.7,均明显低于阴性对照组的1106.3±10.8、1121.3±10.2、1058.5±12.1和空白对照组的1076.6±9.7、1133.4±11.2、1104.3±10.5,差异有统计学意义(P<0.05)。结论:腺病毒介导的靶向PDE5基因的shRNAs能够明显降低大鼠阴茎海绵体平滑肌细胞内游离钙水平。     

糖尿病性勃起功能障碍大鼠阴茎组织内Cx43和eNOS表达的研究

目的:探讨糖尿病(DM)性勃起功能障碍(DMED)与阴茎组织中连接蛋白(Cx43)和eNOS水平变化的相关性。方法:25只SD大鼠腹腔内注射四氧嘧啶建立DM模型,8周后注射阿朴吗啡观察大鼠阴茎勃起情况,筛选出DMED大鼠,应用RT-PCR和免疫组化法分别检测阴茎组织中Cx43和eNOSmRNA表达水平。结果:DMED大鼠阴茎海绵体组织eNOSmRNA表达(0.155±0.157)与DM组(0.508±0.242)比较,显著降低(P<0.01),而Cx43mRNA则显著升高(0.993±0.157vs0.545±0.138,P<0.01),二者存在负相关性(r=-0.987)。免疫组化检测也显示DMED组大鼠阴茎组织平滑肌细胞中eNOS蛋白表达减少,而Cx43蛋白水平增多。结论:阴茎组织内eNOS水平下降可能是DM患者发生ED的主要机制之一;同时,Cx43的表达呈代偿性增加,其功能有待进一步探讨。     

腺病毒介导的激活大鼠阴茎海绵体平滑肌细胞中NO／cGMP通路的实验研究

目的：探讨靶向大鼠iNOS基因的shRNA重组腺病毒载体对大鼠阴茎海绵体平滑肌细胞iN0s基因的激活作用,为阴茎勃起功能障碍（ED）的基因治疗提供实验依据。方法：将前期构建的重组腺病毒AdS—iN—OSrshRNA-EGFP（AdU6／shiNOS）和对照病毒AdU6／shControl,分别转染大鼠阴茎海绵体平滑肌细胞,分别在不同病毒MOI（25,50,75）值下72小时后采样检测。采用realtimeRT-PCR半定量检测AdU6／shiNOS对细胞iNOS基因mRNA表达影响;Western—blot法检测海绵体平滑肌细胞iNOS蛋白表达变化。然后培养基中加L—Arg（10mmol／L）,用酶联免疫法检测病毒转染72小时后海绵体平滑肌细胞内cGMP的浓度变化,记录AdU6／shiNOS对平滑肌细胞内cGMP的影响。结果：AdU6／shiNOS转染大鼠阴茎海绵体平滑肌细胞72小时后,和空白对照组、阴性对照组相比iN0s基因在mRNA和蛋白表达水平均显著上调（P〈O．05）,呈剂量依赖性,MOI一75时RNAa效果最好。而且转染72小时后,实验组原代平滑肌细胞内cGMP水平显著高于对照组及空白组（Pd0．05）。结论：利用腺病毒介导的RNAa技术,提高海绵体平滑肌细胞iN0s基因表达获得成功,可以增加阴茎海绵体平滑肌细胞cGMP水平,激活了NO／cGMP通路,这为勃起功能障碍的基因治疗研究开辟了新的方向。     

Transplantation of endothelial progenitor cells transfected with VEGF165 to restore erectile function in diabetic rats

The present study investigated the effect of transplanting endothelial progenitor cells (EPCs) transfected with the vascular endothelial growth factor gene (VEGF165) into the corpora cavernosa of rats with diabetic erectile dysfunction (ED). A rat model of diabetic ED was constructed via intraperitoneal injection of streptozotocin. After streptozotocin treatment, pre-treated EPCs from each of three groups of rats were transplanted into their corpora cavernosa. Our results, following intracavernosal pressure (ICP) monitoring, showed that ICP increased significantly among rats in the trial group when compared to the results from rats in the blank-plasmid and control groups during basal conditions and electrical stimulation (P<0.01 for both comparisons). Histological examination revealed extensive neovascularisation in the corpora cavernosa of rats in the trial group. Fluorescence microscopy indicated that many of the transplanted EPCs in the trial group survived, differentiated into endothelial cells and integrated into the sites of neovascularisation. Based on the results of this study, we conclude that transplantation of VEGF165-transfected EPCs into the corpora cavernosa of rats with diabetic ED restores erectile function.     

Effect of caffeine on erectile function via up-regulating cavernous cyclic guanosine monophosphate in diabetic rats

Erectile dysfunction (ED) is a common complication of diabetes mellitus. Phosphodiesterase-5 (PDE5) inhibitors, which inhibit the breakdown of intracellular cyclic guanosine monophosphate (cGMP), are used to treat diabetic ED. Caffeine, a nonselective PDE inhibitor used in our daily diet, is controversial regarding its effect on erectile function. To investigate the effect of caffeine on erectile function in diabetic rat models and explore the mechanism, male Sprague-Dawley rats were injected with streptozotocin to induce diabetes mellitus. The rats with blood glucose levels above 300 mg/dL were selected for the study. The rats were divided into 4 groups: group A (normal control rats), group B (diabetic rats treated with normal saline), group C (diabetic rats treated with caffeine, 10 mg/kg per day), and group D (diabetic rats treated with caffeine, 20 mg/kg per day). After 8 weeks of treatment, intracavernous pressure (ICP) was measured to assess erectile function. The radioimmunoassay was used to evaluate the level of cGMP in the cavernosum. The ICP and the cavernous cGMP decreased significantly in the diabetic rats compared with normal controls. An 8-week administration of caffeine at the given dosages increased the ICP and cavernous cGMP in diabetic rats. Caffeine consumption improved the erectile function of diabetic rats by up-regulating cavernous cGMP.     

Valsartan treatment reverses erectile dysfunction in diabetic rats

In order to investigate the effect of angiotensin receptor blockage (ARB) for the treatment on diabetic erectile dysfunction (ED), we used male Sprague-Dawley rats injected with 65 mg/kg streptozotocin to induce diabetes mellitus. The diabetic rats with ED were selected by hypodermic injection of apomorphine (APO) after 8 weeks of model setting. All rats were divided into four groups: G1 (normal control rats), G2 (diabetic rats treated with normal saline), G3 (diabetic rats treated with valsartan) and G4 (diabetic rats treated with spironolactone). After treatment with drugs for 8 weeks, the rate of erection for each group was evaluated after the injection of APO. The intracavernous pressure (ICP) of each rat was then recorded before and after the electrostimulation of the major pelvic ganglion. The rates of erection and the ICP after electrostimulation for diabetic rats treated with valsartan were significantly higher than that in diabetic rats treated with normal saline and spironolactone. The ARB may be an effective therapy for diabetics with ED.     

负压吸引对糖尿病性ED大鼠阴茎海绵体组织一氧化氮合酶表达的影响

目的研究负压吸引对糖尿病性勃起功能障碍（ED）大鼠阴茎组织一氧化氮合酶（NOS）表达水平的影响。方法25只实验鼠中随机选取5只为正常对照组（A组）,其余火鼠用链脲左菌素和阿朴吗啡诱导建立Ⅰ型糖尿病性ED大鼠模型。之后把造模成功的糖尿病性ED大鼠随机分成糖尿病ED吸引组（B组）和糖尿病ED非吸引组（C组）。在B组大鼠负压吸引治疗结束后将A、B、C3组大鼠处死并取阴茎组织进行石蜡包埋。采用免疫组织化学方法检测各组大鼠阴茎组织中三种一氧化氮合酶亚型（nNOS、eNOS、iNOS）的表达情况。结果A组大鼠阴茎组织中nNOS蛋白表达水平高于B组和C组（均P〈0.001）;A组和B组大鼠阴茎组织中eNOS蛋白表达水平高于C组（均P〈0.01）;A组iNOS蛋白表达水平低于B组和C组（P〈0.01,P〈0.001）,同时B组iNOS蛋白表达水平低于C组（P〈0.01）;剩余其他各组间的比较差异无统计学意义（P〉0.05）。结论负压吸引可以通过升高阴茎组织中的eNOS和降低iNOS的表达来改善勃起功能。     

2型糖尿病伴勃起功能障碍的相关发病因素探讨

目的:探讨中青年2型糖尿病(T2DM)患者伴发勃起功能障碍(ED)与血管、神经和雄激素等因素的关系,为ED早期防治提供临床依据。方法:53例50岁以下男性T2DM患者按国际勃起功能指数-5(IIEF-5)评分分为ED组(IIEF评分≤21,n=28)和非ED组(NED组)(IIEF评分≥22,n=28),测定两组血脂、血糖、血清总睾酮(TT)、性激素结合蛋白(SHBG)、硫酸脱氢表雄酮(DHEA-S)、计算法游离睾酮(cFT)等指标,检查两组视网膜病变(DR)、大血管病变和周围神经病变(DPN)等并发症,比较两组各指标及并发症的差异。结果:两组年龄、糖尿病病程、体重指数、血压、血脂、血糖水平具有可比性(P>0.05),ED组DR发生率(39.3%)高于NED组(4.0%)(P<0.05),两组TT、DHEA-S、cFT水平及大血管病变和DPN发生率差异均无统计学意义(P>0.05)。结论:T2DM患者伴ED发生与DR关系密切,对合并DR的T2DM患者尤应早期关注其勃起功能。     

Therapeutic effect of combination of alagebrium (ALT-711) and sildenafil on erectile function in diabetic rats

Recently, the relationship between advanced glycation end products (AGEs) and erectile dysfunction (ED) has been reported. The present study aimed to investigate whether a combination of an AGE cross-link breaker (alagebrium/ALT-711) and sildenafil could enhance the erectile capacity in streptozotocin (STZ) diabetic rats. Additionally, we assessed the effect of that treatment option on some molecules that have been suggested to have crucial roles in AGE-related ED pathways. Four groups of animals were utilized: (1) age-matched control rats, (2) STZ-induced diabetic rats (40 mg kg(-1) i.p.), (3) STZ rats+sildenafil (5 mg kg(-1) p.o.), (4) STZ rats treated with a combination of sildenafil (5 mg kg(-1) p.o)+alagebrium/ALT-711 (10 mg kg(-1) p.o.) for the final 1 month of the 2 months of diabetes period. At 2 months after i.p. injection of STZ, all animals underwent cavernosal nerve stimulation (CNS) to assess erectile function. Penile tissue AGEs, MDA (malondialdehyde), cyclic guanosine monophosphate (cGMP) (ELISA), endothelial nitric oxide (NO) synthase (eNOS), inducible NO synthase (iNOS) (western blot), nuclear factor (NF)-κB, mitogen-activated protein (MAP) kinase (immunohistochemistry) and apoptosis (terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate nick-end labeling) analyses were performed in all groups of rats. STZ diabetic rats had a significant decrease in erectile function as determined by the peak intracavernosal pressure (ICP) and total ICP (area under the erectile curve) after CNS when compared with control rats (P<0.05). The increase in both ICP and area under the erectile curve of STZ diabetic rats treated with a combination of sildenafil+alagebrium/ALT-711 as well as in STZ diabetic rats treated with sildenafil alone was significantly greater than STZ diabetic rats. Additionally, combination treatment decreased AGE, MDA, iNOS, NF-κB, MAP kinase and apoptosis levels, whereas it preserved cGMP contents in diabetic penile tissue. Decreased AGE, MDA, iNOS, NF-κB, MAP kinase and increased cGMP levels at the combination (sildenafil+alagebrium/ALT-711) therapy group increased both the peak ICP and total ICP to CNS in the STZ diabetic rats, which was similar to the response observed in control rats. These results may explain the role of AGEs in diabetes-related ED and the effect of an AGE cross-link breaker alagebrium/ALT-711+sildenafil therapy on some critical molecules related to AGE-related ED pathways.     

降钙素基因相关肽对糖尿病性ED大鼠阴茎海绵体平滑肌细胞表型转化的影响

目的:了解降钙素基因相关肽(CGRP)对糖尿病性ED大鼠阴茎海绵体平滑肌细胞表型转化的影响。方法:利用链脲佐菌素建立糖尿病及糖尿病性ED大鼠模型。阴茎海绵体平滑肌细胞原代培养,并进行免疫细胞化学染色鉴定。实验分为2组:正常对照组和糖尿病性ED大鼠组。不同浓度(0、10,60,100 nmol/L)CGRP作用24h后,利用qRT-PCR检测各组细胞碱性调宁蛋白和骨桥蛋白mRNA的表达。结果:各组原代培养阴茎海绵体平滑肌细胞α-肌动蛋白阳性细胞率为(95.94±0.03)%。与正常对照组比较,糖尿病组ED大鼠阴茎海绵体平滑肌细胞碱性调宁蛋白mRNA表达显著减少(4.41±0.29 vs 10.35±0.62,P<0.01),而骨桥蛋白mRNA表达水平显著上调(5.28±0.32 vs 1.32±0.24,P<0.01)。当CGRP作用的终浓度为100 nmol/L时,糖尿病组大鼠阴茎海绵体平滑肌细胞经CGRP作用后,与未经其作用相比,碱性调宁蛋白mRNA表达显著上调(6.90±0.22 vs 4.41±0.29,P<0.01),而骨桥蛋白mRNA表达水平显著减少(3.26±0.31 vs 5.28±0.32,P<0.01)。结论:CGRP可使糖尿病性ED大鼠阴茎海绵体平滑肌细胞表型从合成型向收缩型转化。     

前列腺癌根治术后勃起功能障碍动物模型的建立

目的 对大鼠海绵体神经(CN)进行解剖并对其造成钳夹损伤,以建立前列腺癌根治术(RP)后勃起功能障碍(ED)的动物模型.方法 将36只雄性SD大鼠随机分为模型组、假手术组、正常组,术后4周通过阿朴吗啡(APO)实验及海绵体内压(ICP)/平均动脉压(MAP)测定、阴茎神经型一氧化氮合酶(nNOS)免疫组织化学检测以评估建立模型的效果.结果 术后4周3组大鼠的阴茎勃起率和平均勃起次数分别为0%和0次、100%(11/11)和(2.24±0.86)次、100%(12/12)和(2.39±0.92)次.模型组大鼠无明显勃起反应,假手术组、正常组可见明确勃起反应.电刺激盆腔星状神经节(MPG)前3组大鼠ICP/MAP分别为(0.13±0.04)、(0.10±0.03)、(0.12±0.03),电刺激MPG后分别为(0.12±0.05)、(0.57±0.08)、(0.58±0.06),电刺激MPG前3组ICP/MAP差异均无统计学意义(P＞0.05),模型组与假手术组、正常组的电刺激MPG后ICP/MAP差异有统计学意义(P＜0.05).3组大鼠阴茎nNOS阳性神经纤维数分别为(23.04±2.59)、(73.94±7.51)、(80.26±6.95),模型组大鼠阴茎nNOS阳性神经纤维数明显少于假手术组、正常组(P＜0.05).结论 大鼠CN结构与人类非常相似,CN钳夹损伤是建立RP术后ED模型的可靠的方法.

Abstract：

Objective To identify rat cavernous nerve (CN) and develop a rat model of erectile dysfunction (ED) after radical prostatectomy (RP) caused by injury of cavernous nerve.Methods Thirty-six male SD rats were were randomly divided into 3 groups:model group,sham-operation group and nomal group.Four weeks after surgery,rat models were evaluated by apomorphine test,ICP/MAP measurement and nNOS-positive nerve fibres in penis.Results The rats in model group had no erectilty in apomorphine test and electical stimulating MPG.The rats in sham-operation group and nomal group had erectility at the same conditions,accompanied with increased ICP/MAP in electrical stimulation ( P＜0.05 ).The nNOS-positive nerve fibres in model group ( 23.04 ± 2.59 ) were less than those in sham-operation group (73.94 ±7.51 ) and normal group (80.26 ±6.95 ).Conclusion Cavernous nerve in rats is highly similar to that in human beings.The rat model of erectile dysfunction after radical prostatectomy caused by cavernous nerve crush injury is reliable.     

糖尿病大鼠阴茎海绵体细胞凋亡的实验研究

目的 观察糖尿病(DM)大鼠阴茎海绵体细胞凋亡,探讨DM性阴茎勃起功能障碍(ED)的发病机理。方法 本文通过四氧嘧啶(Alloxan,AXN)诱导的DM大鼠模型,饲养8周后处死动物并取阴茎海绵体。用琼脂糖凝胶电泳法进行DNA片段分析;用TUNEL法检测细胞凋亡。结果 DM组DNA片段分析出现凋亡特征性梯带。DM组较对照组勃起组织凋亡细胞数明显增多(P<0.01)。结论 DM大鼠阴茎海绵体凋亡细胞增加,细胞凋亡可能是DM性ED的发病机理。