六味地黄汤对快速老化小鼠海马差异表达基因的影响

目的研究六味地黄汤(LW)对快速老化小鼠(senescenceacceleratedmouse,SAM)海马差异表达基因的影响,揭示LW增强认知功能的分子作用机制。方法应用快速老化小鼠亚系SAMP8和SAMR1海马差异表达cDNA芯片,比较SAMP8和SAMR1、SAMP8阴性对照和SAMR1阳性对照、石衫碱甲处理的SAMP8和SAMP8阴性对照以及LW处理的SAMP8和SAMP8阴性对照8个基因表达谱,并对LW的药物效应基因进行比较。结果给予SAMP8LW后,基因DUSP12、NSF、STUB1、CAMKⅡα、AMFR、UQCRFS1和11个新基因的表达出现显著差异,这些基因涉及蛋白酪氨酸磷酸酶家族、苏氨酸/丝氨酸蛋白激酶家族、泛素连接酶和线粒体功能等,LW对SAMP8海马的基因表达具有明显的调控作用。结论提示LW作用于认知功能也许是通过维持正常的细胞增殖和分化、保护正常的突触传递、调节Ca2+信号转导、改善线粒体的功能等途径实现的,基因DUSP12、NSF、STUB1、CAMKⅡα、AMFR、UQCRFS1和11个新基因可能是LW改善学习记忆功能的潜在作用靶标。     

快速老化小鼠脑内能量代谢及学习记忆能力的研究

目的观察快速老化小鼠(SAM)这一较理想的阿尔茨海默病模型,其脑内能量代谢及学习记忆能力随增龄的动态变化情况,研究脑内能量代谢与学习记忆能力的关系。方法选择2,6和12月龄雄性快速老化小鼠(SAMP8)为研究对象,同月龄的抗快速老化小鼠(SAMR1)作为对照。应用新物体识别、Morris水迷宫、穿梭箱等实验研究快速老化小鼠学习记忆能力的变化;应用小动物氟脱氧葡萄糖正电子断层扫描(FDG-PET)技术检测小鼠脑内葡萄糖摄取水平;应用高效液相色谱法检测小鼠海马内ATP,ADP和AMP等能量物质的增龄性变化;应用Western蛋白印迹法检测糖酵解及三羧酸循环葡萄糖代谢关键酶己糖激酶(HK)和丙酮酸脱氢酶(PDH)及葡萄糖转运蛋白的表达情况;应用分光光度法检测HK和PDH的活性。结果在新物体识别实验中,2,6和12月龄SAMP8的1和24 h优先指数显著低于同月龄SAMR1(P<0.05)。在Morris水迷宫实验中,学习期6月龄和12月龄SAMP8的逃避潜伏期显著高于同月龄SAMR1(P<0.05);测试期6月龄和12月龄SAMP8穿环次数显著少于同月龄SAMR1(P<0.05)。在穿梭箱实验中,6月龄和12月龄SAMP8的学习期成功回避次数显著低于同月龄SAMR1(P<0.05),SAMP8的测试期成功回避次数显著低于同月龄SAMR1(P<0.05),表明SAMP8的物体识别记忆能力、空间学习记忆能力及主动回避反应能力呈增龄性衰退。FDG-PET结果显示,2,6和12月龄SAMP8全脑、海马、皮层葡萄糖摄取低于同月龄SAMR1,且SAMP8葡萄糖摄取随着增龄而减少。与同月龄SAMR1比较,6月龄和12月龄SAMP8海马的ATP,ADP和AMP含量均显著降低(P<0.05)。2,6和12月龄SAMP8小鼠海马中HK和PDH的蛋白表达和活性均随着增龄而逐渐降低,其中12月龄SAMP8海马的HK和PDH活性显著低于同月龄SAMR1(P<0.01)。结论 SAMP8学习记忆能力随增龄进行性衰退,SAMP8脑内能量代谢随增龄逐渐降低,其学习记忆能力的衰退可能与其脑内能量代谢的异常相关。     

姜黄素对痴呆模型小鼠学习记忆能力的改善作用及对细胞凋亡的影响

目的探讨姜黄素对痴呆模型小鼠学习记忆能力的改善作用和对脑细胞凋亡及凋亡相关蛋白的影响。方法选用自然快速脑老化小鼠为研究对象,随机将SAMP8脑老化小鼠分为模型组、姜黄素治疗组和盐酸多奈哌齐对照组,将SAMR1小鼠作为正常对照组。采用行为学方法评价各组小鼠治疗前后的学习记忆能力变化,TUNEL法检测海马与皮层的细胞凋亡率,免疫细胞化学法测定细胞凋亡相关蛋白bcl-2和bax的表达情况。结果姜黄素能够明显改善自然快速脑老化小鼠的学习记忆能力,与模型组比较差异有统计学意义(P<0.05);姜黄素治疗组小鼠海马和皮层的细胞凋亡数减少,与模型组比较差异有统计学意义(P<0.05);凋亡相关蛋白bcl-2表达升高,bax表达降低,并且bcl-2/bax比值升高,差异具有统计学意义(P<0.05)。结论姜黄素对痴呆模型小鼠的学习记忆能力具有一定的改善作用,其作用机制可能与其调节凋亡相关蛋白bcl-2与bax的表达有关。     

G蛋白在快速老化痴呆小鼠SAMP8脑组织中的异常表达

摘要 目的：探索在不同月龄小鼠SAMP8皮层和海马中G蛋白的异常表达情况。方法：以正常老化小鼠SAMR1为对照,利用Western-blot方法检测Gαq/11、Gαi和GαS蛋白在8月龄和18月龄小鼠SAMP8的异常表达。结果：与同月龄SAMR1相比,GαS、Gαi和Gαq蛋白在8月龄小鼠SAMP8皮层和海马组织中的表达无明显异常（p﹥0.05）,而到18月龄时,SAMP8皮层部位Gαq表达量明显低于SAMR1（p﹤0.05）,海马部位Gαq和 Gαi的表达量也明显低于SAMR1（p﹤0.05）。结论：18月龄SAMP8脑组织中Gαq和 Gαi的异常表达参与了阿尔海默病（Alzheimer’s, AD）的病理进展,并有望作为AD治疗的一个靶点。     

利用基因芯片技术筛选汉族人群甲基苯丙胺依赖相关基因的初步研究

目的探索汉族群体中甲基苯丙胺依赖相关的差异表达基因。方法采集14例汉族甲基苯丙胺依赖者以及8例年龄、性别相匹配正常人的外周全血,利用mRNA表达谱芯片对其进行基因表达谱分析,并对差异表达基因进行功能分类分析。结果在27 958条转录本中,实验组和对照组差异表达倍数在2倍或2倍以上的转录本有3 560条,其中上调表达基因1 510个,下调表达基因2 576个。对这些差异基因分析发现甲基苯丙胺对细胞组分、分子功能、生物学过程的负调节有重要影响,并与转录调控、核苷酸代谢和修饰、蛋白质修饰、细胞凋亡、应激调节、自身免疫反应等相关。结论甲基苯丙胺成瘾的发生涉及多基因表达的改变,芯片技术可以有效地筛选出甲基苯丙胺依赖者与正常对照的差异表达基因,对进一步探索甲基苯丙胺成瘾机制、有效的干预或逆转毒品成瘾具有重要意义。     

天胡荽积雪草苷对SAMP8小鼠学习记忆功能的改善作用

目的观察天胡荽积雪草苷(asiaticoside from Hydrocotyle sibthorpioides,AHS)对快速老化模型SAMP8小鼠学习记忆功能的影响及其可能机制。方法选用6月龄SAMP8小鼠75只,随机分为SAMP8空白组、阳性药石杉碱甲对照组和AHS低、中、高剂量组,每组15只;另选用6月龄SAMR1小鼠15只作正常对照。各组分别灌胃相应药物3个月后,采用Morris水迷宫法检测小鼠的学习记忆能力,采用Western blot测定Aβ1-42蛋白和可塑性相关蛋白在海马组织的表达水平,采用实时荧光定量PCR测定Aβ相关基因的表达。结果 AHS能明显提高小鼠的学习记忆能力。其机制研究表明,AHS明显降低脑组织Aβ1-42蛋白的含量,抑制Aβ相关基因APP、BACE1和CatB的表达,但提高NEP和IDE的水平;另外,AHS能明显提高突触可塑性相关蛋白包括突触后密度蛋白-95、磷-N-甲基-D-天门冬氨酸受体1、磷酸-钙-钙调素依赖性蛋白激酶Ⅱ、磷酸蛋白激酶A Cβ亚基、蛋白激酶Cγ亚单位、磷酸化CREB和脑源性神经营养因子的表达。结论 AHS能明显改善学习记忆功能,其机制可能与降低脑组织Aβ的形成与沉积、提高突触可塑性相关蛋白的表达有关。     

淫羊藿苷对快速老化小鼠SAMP8学习记忆功能影响的研究

目的:研究淫羊藿苷(Icaritin,ICA)对快速老化小鼠SAMP8学习记忆功能的影响。方法:按体重随机挑选10只8月龄抗快速老化小鼠SAMR1和50只同月龄快速老化小鼠SAMP8,并将SAMP8随机分为5组(模型组、多奈哌齐组和ICA50mg/kg、100mg/kg、200mg/kg组),灌胃给药1个月,在给药前后分别用Morris水迷宫、SMG-2迷宫和跳台方法检测SAMR1和SAMP8的学习记忆功能能力。结果:与给药前相比,给药后的快速老化小鼠SAMP8定位航行和空间搜索能力以及被动反应能力得到提高。结论:ICA可以改善SAMP8的学习记忆能力。     

施普睿达对荷H22肝癌小鼠基因表达谱的影响

目的研究苦豆子生物碱衍生物施普睿达对荷H22肝癌小鼠基因表达谱的影响,探讨施普睿达抗肝癌的分子机制。方法应用包含4096个小鼠基因的cDNA芯片检测施普睿达对荷H22肝癌小鼠基因表达谱的影响,并对差异基因进行GO聚类和统计分析。结果施普睿达治疗前后共有358个基因出现差异表达,83个基因的表达差异达到3倍以上,表达差异在2倍以上的基因共有275个。经GO分析,差异表达基因包括许多与细胞凋亡、细胞周期、代谢、免疫应答和DNA修复等相关的基因。结论施普睿达主要是通过调控肿瘤细胞周期进程、影响代谢和免疫应答、调节肿瘤细胞凋亡相关基因的表达等多种途径抑制肿瘤的增殖和转移。     

脂筏蛋白质组学分析揭示快速老化因素对SAMP8 小鼠海马组织的关键影响

摘要：目的 探讨快速老化小鼠SAMP8老年性痴呆的关键细胞学机制。方法 以2月龄和8月龄SAMP8小鼠 各40只为痴呆相关快速老化动物模型,以同月龄各40只正常老化小鼠SAMR1为对照,从小鼠海马组织提取脂筏蛋 白,采用高效液相色谱-串联质谱法分析。脂筏蛋白质组学检测数据导入DAVID生物信息学分析工具,进行Gene Ontology（GO）生物信息学分析和Kyoto Encyclopedia of Genes and Genomes（KEGG）代谢网络分析,并用线粒体膜电位 和Morris水迷宫方法验证生物信息学分析结果。结果 与SAMR1小鼠比较,快速老化的SAMP8小鼠出现明显的认 知障碍。GO 分析显示,老年期 SAMP8 小鼠脂筏蛋白组中线粒体相关蛋白大幅度减少。KEGG 分析显示,老年期 SAMP8小鼠海马组织线粒体的氧化磷酸化功能大幅度衰退。线粒体膜电位分析显示,老年期SAMP8小鼠海马组织 线粒体膜电位大幅度降低。结论 在老化过程中,SAMP8小鼠海马组织最关键的细胞变化是线粒体氧化磷酸化功 能的过度衰退,这可能是其痴呆发生的重要细胞学机制。     

通络醒脑泡腾片对SAMP8小鼠海马的NeuN蛋白及其超微结构的影响

目的 观察通络醒脑泡腾片对快速老化小鼠亚系8(SAMP8)海马的NeuN蛋白及其超微结构的影响.方法 将SAMP8小鼠随机分为SAMP8组、安理申组、通络醒脑泡腾片组(高、中、低剂量),另取抗快速老化小鼠亚系1(SAMR1)作为对照组,分组后连续给药60d,采用Morris水迷宫和避暗法评价其学习记忆的改变;采用免疫组化法考察海马Aβ和NeuN蛋白的表达;采用电镜法考察海马的超微结构.结果 通络醒脑泡腾片能够缩短SAMP8模型小鼠的潜伏期、明显地增加平台所在象限的时间百分比和进入目标象限的次数,可显著地减少(避暗)错误次数和延长逃避潜伏期;能够下调海马Aβ的表达并上调NeuN蛋白的表达,可显著地减少核糖体的丢失,降低线粒体的肿胀度,改善海马的超微结构.结论 通络醒脑泡腾片可通过抑制Aβ沉积,提高NeuN的表达来修复神经元,保护线粒体,从而提高SAMP8小鼠的学习记忆能力.     

Effects of LW-AFC,a new formula derived from Liuwei Dihuang decoction,on intestinal microbiome in senescence-accelerated mouse prone 8 strain,a mouse model of Alzheimer disease

OBJECTIVE To investigate the effects of LW-AFC,a new formula derived fromLiuwei Dihuang decoction,on gut microbiota and the behavior of learning and memory of SAMP8 mice,a mouse model of Alzheimer Disease(AD),and identify the specific intestinal microbiota correlating with cognitive ability.METHODS Morris-water maze test,novel object recognition test and shuttle-box test were conducted to observe the ability of learning and memory.16S rRNA amplicon sequencing(Illumina,San Diego,CA,USA)was employed to investigate gut microbiota.RESULTS The treatment of LW-AFC improved cognitive impairments of SAMP8 mice,including spatial learning and memory ability,active avoidance response,and object recognition memory capability.Our data indicated that there were significantly 8 increased and 12 decreased operational taxonomic units(OTUs)in the gut microbiota of SAMP8 mice compared with senescence accelerated mouse resistant 1(SAMR1) strains,the control of SAMP8 mice.The treatment of LW-AFC altered 22(16 increased and 6 decreased)OTUs in SAMP8 mice and among them,15 OTUs could be reversed by LW-AFC treatment resulting in a microbial composition similar to that of SAMR1 mice.We further showed that there were7(3 negative and 4 positive correlation)OTUs significantly correlated with all the three types of cognitive abilities,at the order level,including Bacteroidales,Clostridiales,Desulfovibrionales,CW040,and two unclassified orders.LW-AFC had influences on bacterial taxa correlated with the abilities of learning and memory in SAMP8 mice and restored them to SAMR1 mice.CONCLUSION The effects of LW-AFC on improving cognitive impairments of SAMP8 mice might be via modulating intestinal microbiome and LW-AFC could be used as a potential anti-AD agent.     

黄连解毒汤对人细胞色素P450酶6个亚型的体外抑制作用研究

目的:研究黄连解毒汤对人肝微粒体6个亚型CYP1A2、CYP2C8、CYP2C9、CYP2C19、CYP2D6和CYP3A4的体外抑制作用。方法:采用液相色谱-串联质谱法(LC-MS/MS)同时测定对乙酰氨基酚、6α-羟基紫杉醇、4-羟基双氯芬酸、4-羟基美芬妥英、右啡烷、1-羟基咪达唑仑和6β-羟基睾酮,分别代表CYP1A2、CYP2C8、CYP2C9、CYP2C19、CYP2D6和CYP3A4的活性;黄连解毒汤提取物和7种混合探针底物在人肝微粒体中共同孵育,并计算其IC50值表示对CYP450酶的抑制程度。结果:在人肝微粒体体外孵育体系中,黄连解毒汤对CYP2D6的IC50值为3.54μg/mL,对CYP1A2的IC50值为10.8μg/mL,对CYP2C8、CYP2C9、CYP2C19、CYP3A4_T和CYP3A4_M亚酶的IC50值依次为67.7、299、530、199和607μg/mL。结论:在正常剂量下,黄连解毒汤对人肝微粒体CYP2D6和1A2可能有抑制作用,对人肝微粒体CYP2C8、CYP2C9、CYP2C19和CYP3A4无明显抑制作用。     

Propranolol restores cognitive deficits and improves amyloid and Tau pathologies in a senescence-accelerated mouse model

Ageing is associated with a deterioration of cognitive performance and with increased risk of neurodegenerative disorders. Hypertension is the most-prevalent modifiable risk factor for cardiovascular morbidity and mortality worldwide, and clinical data suggest that hypertension is a risk factor for Alzheimer's disease (AD). In the present study we tested whether propranolol, a β-receptor antagonist commonly used as antihypertensive drug, could ameliorate the cognitive impairments and increases in AD-related markers shown by the senescence-accelerated mouse prone-8 (SAMP8). Propranolol administration (5?mg/kg for 3 weeks) to 6-month-old SAMP8 mice attenuated cognitive memory impairments shown by these mice in the novel object recognition test. In the hippocampus of SAMP8 mice it has been found increases in Aβ(42) levels, the principal constituent of amyloid plaques observed in AD, accompanied by both an increased expression of the cleaving enzyme BACE1 and a decreased expression of the degrading enzyme IDE. All these effects were reversed by propranolol treatment. Tau hyperphosphorylation (PHF-1 epitope) shown by SAMP8 mice at this age was also decreased in the hippocampus of propranolol-treated mice, an effect probably related to a decrease in JNK1 expression. Interestingly, propranolol also phosphorylated Akt in SAMP8 mice, which was associated with an increase of glycogen synthase kinase-3β phosphorylation, contributing therefore to the reductions in Tau hyperphosphorylation. Synaptic pathology in SAMP8 mice, as shown by decreases in synaptophysin and BDNF, was also counteracted by propranolol treatment. Overall, propranolol might be beneficial in age-related brain dysfunction and could be an emerging candidate for the treatment of other neurodegenerative diseases. This article is part of a Special Issue entitled 'Cognitive Enhancers'.     

DL0410 ameliorates cognitive disorder in SAMP8 mice by promoting mitochondrial dynamics and the NMDAR-CREB-BDNF pathway

Alzheimer’s disease (AD) is a worldwide problem and there are no effective drugs for AD treatment. Previous studies show that DL0410 is a multi-target, anti-AD agent. In this study, we investigated the therapeutic effect of DL0410 and its action mechanism in SAMP8 mice. DL0410 (1−10 mg·kg⁻¹·d⁻¹) was orally administered to 8-month-old SAMP mice (SAMP8) for 8 weeks. We showed that DL0410 administration effectively ameliorated the cognitive deficits in the Morris water maze test, novel object recognition test, and nest building test. We revealed that DL0410 dose-dependently increased the expression levels of the mitochondrial proteins (PGC-1α, Mitofusin 2, OPA1, and Drp1), and subsequently ameliorated the processes of mitochondrial biosynthesis, fusion, and fission in the cortex and hippocampus of SAMP8 mice. Furthermore, DL0410 administration promoted the expression of synaptic proteins (synaptophysin and PSD95) in the brain of SAMP8 mice, and upregulated the protein phosphorylation in NMDAR-CAMKII/CAMKIV-CREB pathway responsible for the synaptic plasticity. DL0410 administration dose-dependently increased the expression of BDNF and TrkB, and the neurotrophic effect was mediated via the ERK1/2 and PI3K-AKT-GSK-3β pathways. DL0410 administration upregulated Bcl-2, increased the Bcl-2/Bax ratio and the level of caspase 3 and PARP-1, alleviating neuronal apoptosis. We proposed that the NMDAR-CREB-BDNF pathway might establish a positive feedback loop between synaptic plasticity and neurotrophy, with CREB at the center. In summary, DL0410 promotes synaptic function and neuronal survival, thus ameliorating cognitive deficits in SAMP8 mice via improved mitochondrial dynamics and increased activity of the NMDAR-CREB-BDNF pathway. DL0410 is a promising candidate to treat aging-related AD, and deserves more research and development in future.     

经输尿管镜钬激光碎石术与气压弹道碎石术治疗输尿管结石的临床疗效比较

目的比较输尿管镜钬激光碎石术（holmium laser lithotfipsy,HL）与气压弹道碎石术（pneumatic lithotripsy,PL）治疗输尿管结石的临床疗效。方法总结应用输尿管镜技术治疗165例输尿管结石患者的临床材料,其中钬激光碎石术有81例,气压弹道碎石术有84例。结果钬激光碎石术碎石总有效率为96.3%,高于气压弹道碎石术的85.7%（P〈0.05）;钬激光碎石术平均手术时间为（26.1±3.5）min,短于气压弹道碎石术的（38.3±5.2）min（P〈0.05）。结论钬激光碎石术的有效率和手术时间均优于气压弹道碎石术。钬激光碎石是治疗输尿管结石的一种安全高效的方法。     

淫羊藿苷对快速老化小鼠SAMP10脑组织单胺类及氨基酸类神经递质的影响

目的:探讨淫羊藿苷(ICA)对快速老化小鼠SAMP10脑组织单胺类及氨基酸类神经递质的影响。方法:本实验采取8月龄快速老化小鼠SAMP10为实验对象,随机分为模型SAMP10组、阳性药多奈哌齐组(1mg/kg)、ICA 3个剂量(50、100、200mg/kg)组,每组12只,以12只同月龄抗快速老化小鼠SAMR1为正常对照。灌胃给药30d,一天一次,高效液相-电化学法检测快速老化小鼠SAMP10大脑皮层的去甲肾上腺素(NE)、5-羟色胺(5-HT)、多巴胺(DA)及其代谢产物3,4-二羟苯乙酸(DOPAC)和高香草酸(HVA)的含量来探讨ICA对SAMP10脑组织单胺类神经递质的影响,通过检测谷氨酸(Glu)、谷氨酰胺(Gln)、天冬氨酸(Asp)、γ-氨基丁酸(GA-BA)、牛磺酸(Tau)、甘氨酸(Gly)的含量来探讨ICA对SAMP10脑组织氨基酸类神经递质的影响。结果:ICA可显著降低SAMP10大脑皮层内Glu、Gln、GABA含量(P<0.01),升高NE、DA、DOPAC、5-HT、HVA、Asp以及Tau的含量(P<0.01或P<0.05),但对SAMP10大脑皮层内Gly的含量并没有显著影响(P>0.05)。结论:ICA可能通过升高脑内单胺类神经递质的含量、调节兴奋性氨基酸类递质的代谢平衡以及调节抑制性氨基酸的代谢平衡达到改善SAMP10的学习记忆的作用。     

六味地黄汤及其拆方对快速老化小鼠免疫功能的调节作用

目的比较六味地黄汤全方（LW）及其拆方三补（地黄、山茱萸、山药）和三泻（茯苓、泽泻、牡丹皮）对快速老化小鼠（SAM）免疫功能的调节作用。方法分别灌胃给予SAM亚系小鼠（SAMP8）LW（10g/kg）、三补（6.4g/kg）和三泻（3.6g/kg）,每日1次,连续60d;抗快速老化亚系小鼠（SAMR1）作为对照。采用3H-TdR掺入法检测脾脏淋巴细胞增殖能力,流式细胞术观察脾脏CD3＋、CD4＋、CD8＋、CD19＋淋巴细胞百分率。结果与SAMR1组相比,SAMP8组经刀豆蛋白A（ConA）和脂多糖（LPS）诱导的脾细胞增殖能力、脾脏CD3＋、CD4＋细胞百分率、CD3＋/CD19＋和CD4＋/CD8＋比值均显著下降,而CD19＋细胞百分率显著上升;灌胃给予LW全方及折方对上述指标具有不同程度的改善作用,其中,LW对LPS诱导的脾细胞增殖能力、CD3＋和CD19＋细胞百分率、CD3＋/CD19＋比值、CD4＋细胞百分率及CD4＋/CD8＋比值的改善作用优于三补和三泻;三补对升高ConA诱导的脾细胞增殖能力优于LW和三泻,对脾脏CD3＋和CD19＋细胞百分率、CD3＋/CD19＋细胞比值及CD4＋细胞百分率的改善作用优于三泻;三泻升高CD4＋/CD8＋比值的作用优于三补。结论 LW可显著改善SAMP8低下的T、B淋巴细胞功能,纠正脾脏CD4＋/CD8＋T细胞亚群比例失衡,其作用优于单独应用三补和三泻;三补和三泻对SAMP8的免疫改善作用各有侧重,三补的作用可能在于调节T、B淋巴细胞的数量和功能,三泻则可能着重于调节T细胞亚群的比例。本研究提示LW对免疫功能的调节是三补和三泻相互协调综合作用的结果 ,该结果为揭示LW配伍规律及其科学内涵提供了一定的实验依据。     

Depressive behavior and alterations in receptors for dopamine and 5-hydroxytryptamine in the brain of the senescence accelerated mouse (SAM)-P10

The senescence accelerated mouse (SAM) is known as a murine model of aging. SAM consists of senescence accelerated-prone mouse (SAMP) and senescence accelerated-resistant mouse (SAMR). Previous studies reported that SAMP10 exhibits age-related learning impairments and behavioral depression in a tail suspension test after 7 months. We investigated the changes in emotional behavior in a forced swimming test and in receptors for dopamine and 5-hydroxytryptamine (5-HT) in SAMP10. SAMP10 at 8 months showed an increase of immobility in the test compared with SAMR1. Treatment with desipramine (25 mg/kg, i.p., 3 days) in SAMP10 caused a decrease in immobility. In the cortex from SAMP10, [3H]quinpirole binding to D2/D3 dopamine receptors increased significantly compared with control SAMR1. In the hippocampus from SAMP10, [3H]8-hydroxy DPAT binding to 5-HT1A receptor increased. In midbrains from SAMP10, bindings of [3H]quinpirole and [3H]8-hydroxy DPAT increased. [3H]SCH23390 binding to D1/D5 receptors and [3H]ketanserin binding to 5-HT2 receptor in brain regions examined in SAMP10 were similar to those in SAMR1. The present findings represent the first neurochemical evidence of an increase of D2/D3 and 5-HT1A receptors in SAMP10. SAMP10 may be a useful model of aging associated depressive behavior.