八肽胆囊收缩素对大鼠大脑皮质蛋白激酶CI知性的影响

目的：探讨胆囊收综素受体（CCK receptor)在中枢神经系统的信号传递机制。方法：采用分离的大鼠大脑皮质神经细胞，观察CCK8，CCKA受体拮抗剂L－364，718和CCKB受体拮抗剂L－365，260对大鼠大脑皮质蛋白激酶C（PKC）活性的影响，结果：CCK8在10^-11-10^-6mol/L范围内可刺激PKCI知性的增加，超过10^-6mol/L后，逐渐趋于饱和，CCKA受体拮抗剂L－364，718，CCKB受体拮抗剂L－365，260均可根据剂量的大小不同程度地抑制CCK8引起的PKC活性改变，但两者IC50相差60倍，L－365，260在较低浓度时即能明显拮抗CCK8引起的PKC活性变化。结论：本研究结果提示，CCK8可能通过CCKB受体引起PKC活性变化，而PKC可能是CCKB受体的重要信号传递机制之一。^     

八肽胆囊收缩素对小鼠神经元蛋白质磷酸化的影响

目的:从蛋白质可逆磷酸化修饰的角度,对小鼠神经元在八肽胆囊收缩素(CCK8)刺激下的信号转导通路进行初步研究.方法:将培养的小鼠神经元分为对照组(加入无磷培养基)、实验组(加入CCK8)、拮抗剂组(分别加入CCKA受体拮抗剂L-364 718和(或)CCKB受体拮抗剂L-365 260).采用双向电泳法观察CCK8和受体拮抗剂作用下蛋白质磷酸化水平的改变.结果:CCK8作用不同时间后,神经元蛋白质磷酸化状态发生明显改变,涉及的信号转导相关磷酸化蛋白质包括多种蛋白激酶、胞内信号分子、激素受体、转录因子等;动力学分析结果显示,主要的信号转导相关蛋白的磷酸化时间动力学曲线多数呈峰型;应用CCK受体拮抗剂作用后的结果表明,在皮质神经元中同时存在CCK的2种类型受体,其中B型受体介导的信号转导途径更复杂.结论:CCK A型、B型受体均可介导CCK8在神经元的信号转导,其中B型受体介导的信号途径可能包括肌醇磷脂信使系统、cAMP-PKA途径、MAPK途径和JNK途径等.     

蛋白激酶C不同亚型对丙泊酚血管舒张作用的影响

目的探讨丙泊酚的血管舒张作用与蛋白激酶C(PKC)不同亚型间的关系。方法将SD大鼠胸主动脉环随机分为内皮完整组(n=36)和去内皮组(n=36),每组各分6个亚组:①10 nmol/L Go6976+1×10-6mol/L去甲肾上腺素(NA)+丙泊酚处理组(n=6);②10μmol/L Rottlerin+1×10-6mol/L NA+丙泊酚处理组(n=6);③2μmol/L PKCε-Pseudo(假底物)+1×10-6mol/L NA+丙泊酚处理组(n=6);④2μmol/L PKCθ-Pseudo+1×10-6mol/L NA+丙泊酚处理组(n=6);⑤2μmol/L PKCζ-Pseudo+1×10-6mol/L NA+丙泊酚处理组(n=6);⑥1×10-6mol/L NA+丙泊酚处理组(对照组,n=6)。PKCα抑制剂Go6976,PKCδ抑制剂Rottlerin,PKCζ、θ和ε假底物孵育血管环30 min后,加1×10-6mol/L NA收缩血管环达峰值,每15 min加递增浓度的丙泊酚(1×10-6、5×10-6、1×10-5、5×10-5、1×10-4mol/L),观察血管张力的变化。结果内...     

冬凌草甲素对β-肾上腺素受体及腺苷酸环化酶活性的影响

本研究采用放射性配体结合分析法和腺苷酸环化酶(AC)活性测定,观察了冬凌草甲素(Oridonin)对大鼠外周血淋巴细胞β受体的结合作用和北京鸭虹细胞膜中AC活性的影响。结果表明,Oridonin和普萘洛尔(Propranolol)一样能与标记配基竞争与β受体结合,其IC_(50)分别为6.7×10~(-5)mol/L,6.0×10~(-8)mol/L。KI值分别为1.9×10~(-5)mol/L,1.7×10~(-8)mol/L。阻断肾上腺素对膜制剂中AC活性的激动作用,从而证明Oridonin是一种较弱的β受体拮抗剂。     

食欲素A调控INS-1胰岛素瘤细胞的细胞增殖的分子机制

目的探讨增食欲素A(Orexin A)通过增食欲素受体1(OX1R)和AKT/PKB信号传导途径对胰岛细胞增殖的干预效应。方法体外培养的大鼠INS-1胰岛素瘤细胞暴露于不同浓度的Orexin A,OX1R拮抗剂(SB334867)、PI3K拮抗剂(渥曼青霉素)和AKT拮抗剂(PF-04691502)干预Orexin A的作用,测定INS-1的细胞增殖、凋亡、胰岛素分泌、OX1R蛋白活性及AKT蛋白磷酸化水平。结果 Orexin A(10-10~10-6mol/L)可刺激INS-1细胞的增殖和活化,防止细胞凋亡,并增加胰岛素的分泌;Orexin A(10-10~10-6mol/L)增强了INS-1细胞内AKT的磷酸化,SB334867(10-6mol/L)、渥曼青霉素(10-8mol/L)和PF-04691502(10-6mol/L)可以减弱Orexin A的作用。结论 INS-1细胞内Orexin A通过Orexin A-OX1R的介导而活化AKT信号通路,促进细胞增殖。     

蛋白激酶C对缺血海马突触体谷氨酸摄取的调控作用

采用大鼠脑片体外缺血模型,观察海马突触体内蛋白激酶C(PKC)活性的变化,以及这种变化对突触体谷氨酸(Glu)摄取的影响。结果显示:海马脑片体外“缺血”10min,突触体内PKC活性基本不变,而缺血30min,突触体内PKC活性显著上升(P<0.01,n=6);非NMDA受体拮抗剂DNQX有效地抑制PKC活性的同时,降低胞外Glu的堆积,而NMDA受体阻断剂AP_6无作用。进一步实验证明,PKC激活剂PDB浓度依赖性地抑制突触体对~3H-Glu的摄取(IC_(60)为131±9.8μmol·L~(-1)),此抑制作用可由PKC抑制剂H-7(100μmol·L~(-1))抵消。提示脑缺血诱发Glu堆积的分子机理可能是:脑缺血引起钙内流导致Glu过量释放,Glu又通过突触前非NMDA受体激活PKC,抑制其自身摄取,正反馈性加重胞外Glu的堆积。     

纳洛酮在细胞信号转导系统中对甲硫氨酸脑啡肽的拮抗作用

目的:探讨甲硫氨酸脑啡肽对细胞信号转导系统的影响及其机制.方法:用甲硫氨酸脑啡肽及不同浓度的纳洛酮处理小鼠的骨髓瘤细胞(NS-1),采用组蛋白磷酸化法测定NS-1细胞蛋白激酶A(PKA)和蛋白激酶C(PKC)的活性.结果:1×10-6 mol/L的甲硫氨酸脑啡肽可以升高NS-1细胞胞浆PKA活性,却降低胞浆PKC活性,而且这2种作用均能被不同浓度的纳洛酮所拮抗.结论:甲硫氨酸脑啡肽通过传统的阿片受体机制参与了2条(cAMP-PKA途径及DG-PKC途径)胞外信号传递系统的信号传递.     

纳洛酮在细胞信号转导系统中对甲硫氨酸脑啡肽的拮抗作用

目的探讨甲硫氨酸脑啡肽对细胞信号转导系统的影响及其机制.方法用甲硫氨酸脑啡肽及不同浓度的纳洛酮处理小鼠的骨髓瘤细胞(NS-1),采用组蛋白磷酸化法测定NS-1细胞蛋白激酶A(PKA)和蛋白激酶C(PKC)的活性.结果1×10-6 mol/L的甲硫氨酸脑啡肽可以升高NS-1细胞胞浆PKA活性,却降低胞浆PKC活性,而且这2种作用均能被不同浓度的纳洛酮所拮抗.结论甲硫氨酸脑啡肽通过传统的阿片受体机制参与了2条(cAMP-PKA途径及DG-PKC途径)胞外信号传递系统的信号传递.     

川芎嗪对P2X3受体介导的大鼠伤害性兴奋传入的作用

通过动物痛行为反应(缩足反射)确定局部和鞘内应用川芎嗪(TMP)对ATP等P2X受体激动剂所致大鼠足底急性伤害性行为反应的影响。P2X3受体拮抗剂TNP-ATP(0．3μmol／L)明显抑制P2X受体激动剂ATP(1μmol／L)或α，β-meATP(0．6μmol／L)引起的大鼠足底急性伤害性反应。大鼠足底局部应用TMP(0．1-10mmol／L)剂量依赖性地对ATP(1μmol／L)或α，β-meATP(0．6μmol／L)引起的伤害性反应具有抑制作用。鞘内应用TMP(50mmol／L)对ATP(1μmol／L)或α，β-meATP(0．6μmol／L)引起的伤害性反应具有抑制作用。结果表明，TMP可通过阻断P2X3受体介导的伤害性兴奋传入抑制P2X受体激动剂引起的大鼠足底急性伤害性反应。     

川芎嗪抗伤害性反应作用机制初探

目的　观察川芎嗪(TMP)对嘌呤2 X(P2 X)受体激动剂[三磷酸腺苷(ATP)和α,β-亚甲三磷酸腺苷(α,β- me ATP) ]、前列腺素E2 (PGE2 )及P物质(SP)所致大鼠足底急性伤害性反应的影响。方法　通过大鼠痛行为反应确定局部应用TMP对ATP等P2 X受体激动剂、PGE2 及SP所致大鼠足底急性伤害性反应和足底炎症水肿的影响。结果　TMP (10 mm ol/L )明显抑制ATP (1μm ol/L )或α,β- m e ATP (0 .6μm ol/L )引起的大鼠足底急性伤害性反应。TMP(10 m mol/L)可抑制PGE2 (5 μmol/L)或α,β- me ATP(0 .2 μm ol/L)加PGE2 (5 μmol/L )引起的伤害性反应。TMP (10 m mol/L )不影响α,β- me ATP (0 .2μmol/L )加SP (10μmol/L )引起的伤害性反应。TMP对PGE2 、SP或α,β- m e ATP分别加PGE2 或SP引起的大鼠足底炎症水肿无明显影响。结论　TMP主要通过抑制P2 X受体兴奋介导的伤害性信息传递产生抗伤害性反应作用。     

The effects of cholecystokinin octapeptide on PKC activity in rat cerebral cortex neurocytes]

OBJECTIVE: To investigate the effects of CCK8 on protein kinase C activity in rat cerebral cortex. METHODS: The cerebral cortex neurocytes were isolated and used as a model. The effects of CCK8, L-364, 718 and L-365, 260 on PKC activities were detected by using a non-radioactive method. RESULTS: CCK8 caused a detectable increase in PKC activity at 10(-11) mol/L, and a peak increase of PKC activity was observed at 10(-5) mol/L (about 4.5 U/mg protein). PKC activity was increased in dose-dependent manner by CCK8(10(-11)-10(-6) mol/L). The CCKB-selective receptor antagonist L-365, 260 with a higher efficiency, and the CCKA-selective receptor antagonist L-364, 718 with a lower efficiency were able to block a maximal effect of CCK8-induced PKC activation. CONCLUSIONS: CCK8 may regulate PKC activities in rat cerebral cortex through CCKB receptor.     

大鼠大脑皮质胆囊收缩素受体的体外结合分析法研究

用Ｂｏｌｔｏｎ－Ｈｕｎｔｅｒ试剂联结法标记胆囊收缩素（ＣＣＫ８）,得１２５Ｉ－ＢＨ－ＣＣＫ８,其比放射性为３．４ＴＢｑ／ｍｍｏｌ,放射化学纯度大于９６％。取其与自制的大鼠大脑皮质细胞膜进行受体放射分析,发现标记配体与大鼠大脑皮质ＣＣＫ受体的结合具有温度和时间依赖性,可饱和性,可逆性及特异性。经Ｓｃａｔｃｈａｒｄ分析获大鼠大脑皮质细胞膜ＣＣＫ受体Ｋｄ值为１．０９８ｎｍｏｌ／Ｌ,Ｂｍａｘ为１９７．５ｆｍｏｌ／ｍｇ蛋白。     

Study on the radioligand binding assay of cholecystokinin receptor in rat cerebral cortex]

A radioligand binding assay system for determining the characterization of CCK receptor is presented. Using Bolton-Hunter reagent, we prepared a biologically active, specific 125I-BH-CCK8. The iodination mixture was then transferred to a column of Sephadex G-25 and examined by silica thin layer chromatography. Its specific activity and radiochemical purity were 3.4 TBq/mmol and 96% respectively. Binding of 125I-BH-CCK8 to the membrane of rat cerebral cortex was rapid, reversible, time-temperature dependent, saturable and specific. The labeled CCK was shown to have biological activity as measured by the CCK receptor radioassay. Under our laboratorial conditions, the CCK binding required an hour to reach equilibrium at 4 degrees C. We chose polyethylene glycol 6,000 and gamma-globulin protein for the separation of B and F. Scatchard plot of CCK binding was linear with a Kd value of 1.098 nmol/L and Bmax of 197.5 fmol/mg protein. The results of this study support the stand-point that CCK may function as a regulatory peptide in brain and hence may be of use for clarifying the CCK receptor's function in central nervous system.     

胆囊收缩素对豚鼠结肠平滑肌及其细胞膜L-型钙电流和膜电位的影响

目的 探讨胆囊收缩素8肽(CCK-8S)对豚鼠近端结肠平滑肌及细胞膜L-型钙电流和膜电位的电生理作用及其机制.方法 (1)采用RM6240多道生理信号采集处理系统记录CCK-8S对豚鼠近端结肠平滑肌肌条收缩的影响;(2)检测Fluo-2/AM标记的近端结肠平滑肌细胞膜内钙离子浓度([Ca2+]i)变化;(3)用EPC-10膜片钳放大器测量全细胞模式下CCK-8S对近端结肠平滑肌细胞膜静息电位(RP)、动作电位(AP)和L-型钙通道电流(ICa-L)的影响.结果 CCK-8S(10-1mol/L)作用后:(1)豚鼠近端结肠平滑肌肌条收缩幅值和频率分别为对照组的(149±12)%和(132±13)%(均P＜0.05);(2)近端结肠平滑肌细胞膜的[Ca2+]i为对照组的(738±24)%(P＜0.05);(3)RP、AP峰值及AP快速复极时间分别为对照组的(52±9)%、(140±4)%和(61±13)%(均P＜0.05),该效应可被预先加入的CCK1受体拮抗剂地伐西匹和(或)L-型钙通道阻断剂尼非地平阻断(n=8,均P＜0.05),而预先向灌流液中加入CCK2受体拮抗剂CI 988后,CCK-8S对RP、AP峰值及AP快速复极时间的作用仍存在;(4)从-60 mV去极化至+10 mV,ICa-L为对照组的(138±7)%(P＜0.05),但分别可被相应拮抗剂抑制;当向电极内液加入肝素(10-6 mol/L)或向细胞外液加入staurosporine(10-6 mol/L)后,CCK-8S对Ica-L均没有影响(2.9%±2.6%和1.9%±2.3%,均P＞0.05).结论 CCK-8S通过CCK1受体促进近端结肠平滑肌自发性收缩频率和强度;其机制与激活1,4,5-三磷酸肌醇介导的蛋白激酶C途径进而促进L-型钙通道开放有关.

Abstract：

Objective To investigate the effects and mechanism of cholecystokinin octapeptide (CCK-8S) on the contractile activity of smooth muscles,L-type calcium current and membrane potentials of proximal colon myocytes in guinea pig.Methods ( 1 ) Strips of proximal colon were obtained from adult guinea pigs.The contraction of these stripes was measured by a RM6240 multi-channel physiological signal system.(2) Suspension of single smooth muscle cells (SMCs) were obtained from proximal colon and isolated by enzymatic digestion.The effect of CCK-8S on intracellular calcium concentration ( [Ca2+] i) of SMCs was examined by fura-2-1oaded miscrofluorimetric measurement.(3) Resting potential ( RP),action potential (AP) and L-type calcium current (ICa-L ) were recorded by patch-clamp technique.Results ( 1 )The contractile amplitude and frequency of muscle stripes enhanced by CCK-8S ( 10 -7 mol/L) were ( 149 ±12)% and (132 ± 13 )% respectively of those of control group (all P ＜ 0.05 ).They were significantly attenuated by pretreating strips with CCK1 receptor antagonist devazepide ( 10-7 mol/L),L-type calcium channel blocker nifedipine ( 10 -5 mol/L),Ca2+ -ATPase inhibitor TG (thapsigargin) ( 10-5 mol/L) and BA (boric acid) (10-5 mol/L) respectively.(2) [Ca2+]i of SMCs intensified by CCK-8S was (738 ±24)% of that of control group.And it was inhibited by pretreating SMCs with devazepide(all P ＜0.05).(3) After the superfusion of CCK-8S,RP depolarized to (52 ±9)%,the exogenously stimulated peak values of AP rose to (140±4)% and fast repolarization time of AP decreased to (61 ± 13)% (all P ＜0.05).They were significantly inhibited when these cells were pretreated with devazepide and/or nifedipine (n = 8,P ＜0.05 for each group) whereas CI 988 had little effect.(4) The CCK-8S-evoked ICa-L of SMCs at the voltage of + 10 mV was boosted to ( 138 ± 7 )%.Such an effect was suppressed by a pretreatment with nifedipine,devazepide,TG and BA respectively.In the presence of an inhibitor of inositol 1 ,4,5-trisphosphate (IP3 ) receptors,heparin (10-6 mol/L) and an protein kinase C (PKC) inhibitor,saurosporine (10-6 mol/L),CCK-8S did not significantly intensify ICa-L (all P ＞ 0.05 ).Conclusion CCK-8S promotes proximal colon contraction by CCK1 receptors through the activation of IP3-mediated PKC pathway.     

EFFECT OF PHORBOL ESTER ON cAMP-DEPENDENT PROTEIN KINASE ACTIVITY IN CARDIOMYOCYTES

Cardiomyocytes isolated from neonatal rats were treated with phorbol-12-myristate-13-acetate(PMA) ranging from 10^-11 to 10^-7mol/L for 20 min,causing cytosol protein kinase A (PKA) activity to decrease while particulate PKA activity increase in a concentration-dependent manner.The change of PKA activity induced by PMA was abolished completely by pretreatment of polymyxin B or depletion of protein kinase C (PKC).Type Ⅱ PKA activity in particulate fraction was enhanced remarkably,while that of type I PKA was not altered when the cells were treated with 100 nmol/L PMA.The results suggested that subcellular distribution and activity of PKA in cardiomyocytes may be regulated by PKC.     

嘌呤P2X7 受体介导对氯苯丙酸致大鼠 前额皮质蛋白激酶的变化

目的 探讨脑内5- 羟色胺（5-HT）含量下降后大鼠前额皮质受体后信号P38 MAPK、PKC 和 CaMK Ⅱ蛋白和基因表达的变化及P2X7 受体在其中的作用。方法 大鼠分为正常组、对照组、对氯苯丙氨酸 （PCPA）组、P2X7 受体拮抗剂及激动剂干预组。腹腔注射PCPA 使脑内5-HT 合成下降,脑室注射P2X7 受 体拮抗剂和激动剂,采用免疫组织化学、Western blot 和实时荧光定量PCR 检测前额皮质P38 MAPK、PKC 和 CaMK Ⅱ蛋白和mRNA 的表达。结果 与对照组比较,PCPA 组的P38 MAPK 蛋白和mRNA 表达增加,而PKC 和CaMK Ⅱ的蛋白和mRNA 表达水平下降。与PCPA 组比较,P2X7 受体拮抗剂能使P38 MAPK 蛋白和基因 mRNA 表达下降,PKC 和CaMK Ⅱ的蛋白表达水平升高及mRNA 表达水平上升;而P2X7 受体激动剂引起 P38 MAPK 蛋白和mRNA 表达水平升高,PKC 和CaMK Ⅱ的蛋白表达下降和基因mRNA 表达水平下降。结论 P2X7 受体介导了脑内5-HT 下降所致的前额皮质受体后信号P38 MAPK、PKC 和CaMK Ⅱ蛋白和基因表达 的变化。     

The signal transduction pathway in the proliferation of airway smooth muscle cells induced by urotensin Ⅱ

Background Human urotensin Ⅱ (UⅡ) is the most potent mammalian vasoconstrictor identified so far. Our previous study showed that UⅡ is a potent mitogen of airway smooth muscle cells (ASMC) inducing ASMC proliferation in a dose-dependent manner. The signal transduction pathway of UⅡ mitogenic effect remains to be clarified. This study was conducted to investigate the signal transduction pathway in the proliferation of ASMC induced by UⅡ. Methods In primary cultures of rat ASMCs, activities of protein kinase C (PKC), mitogen-activated protein kinase (MAPK) and calcineurin (CaN) induced by UⅡ were measured. The effect of CaN on PKC and MAPK was studied by adding cyclosporin A (CsA), a specific inhibitor of CaN. Using H7 and PD98059, inhibitors of PKC and MAPK, respectively, to study the effect of PKC and MAPK on CaN. The cytosolic free calcium concentration induced by UⅡ was measured using Fura-2/AM. Results UⅡ 10-7 mol/L stimulated ASMC PKC and MAPK activities by 44% and 24% (P&lt;0.01), respectively, after incubating for 20 minutes. It increased CaN activity in a time-dependent manner, being 1.68 times as that of control for 24 hours (P&lt;0.01). It promoted the cytosolic free calcium concentration increase of 18% (P&lt;0.01). CsA 10-6 mol/L and H7 50 μmol/L inhibited UⅡ-stimulated CaN activity by 45% (P&lt;0.01) and 21% (P&lt;0.05), respectively, while PD98059 50 μmol/L had no effect on CaN activity (P&gt;0.05). CsA 10-6 mol/L inhibited UⅡ-stimulated PKC activity by 14% (P&lt;0.05), while having no effect on MAPK activity (P&gt;0.05). Conclusions UⅡ increases cytosolic free calcium concentration and activates PKC, MAPK and CaN. The signal transduction pathway between PKC and CaN has cross-talk.     

血管紧张素Ⅱ抑制ECV304细胞BKca效应的细胞机制及银杏叶提取物的作用

目的观察血管紧张素Ⅱ(AngiotensinⅡ,AⅡ)抑制人脐静脉内皮细胞株ECV304细胞的大电导钙激活钾通道(Maxi-conductance calcinm-activated potassiun channel,BKCa)效应与AⅡ受体、蛋白激酶C(ProteinKinase C,PKC)和一氧化氮(Nitric Oxide,NO)的关系,以及中药银杏叶提取物(Gingko leaf extract)对AⅡ抑制BKCa效应的影响.方法细胞贴附式膜片箝技术.结果 AⅡ受体拮抗剂saralasin(10-7 mol/L)可对抗AⅡ(10-7mol/L)的抑制效应;PKC的激动剂佛波酯(5×10-8 mol/L,Phorbolester)可加重AⅡ的抑制效应;NO(10-10mol/L.sod-ium nitroprusside,SNP)则削弱AⅡ的抑制作用.中药银杏叶提取物(800μg/ml)可激活BKCa,并可对抗AⅡ的抑制效应.结论 AⅡ对ECV304 BKCa的抑制是由AⅡ受体介导的,PKC参与其中.NO与银杏叶提取物对ECV304 BKCa免受AⅡ的抑制具有保护作用.     

生物法测定血浆胆囊收缩素活性

本文根据胆囊收缩素(CCK)在生理浓度下可刺激离体胰腺泡分泌淀粉酶的特性,来测定血浆CCK浓度。此方法不受血浆中胃泌素的干扰,可反映全部有生物活性的CCK分子,灵敏度为0.86pmol/L CCK-8当量。本文对11例正常人空腹及餐后血浆CCK浓度进行了测定。     

神经肽Y Y1受体拮抗剂促进大鼠BMSCs成骨分化和股骨缺损修复

目的探索神经肽Y Y1受体拮抗剂（PD160170）对大鼠骨髓间充质干细胞（BMSCs）成骨分化以及骨缺损修复的影响。方 法第三代大鼠BMSCs成骨分化诱导培养,随机分为4组,对照组（等体积PBS）,终浓度分别为10-6、10-7、10-8 mol/L Y1受体拮抗 剂三浓度梯度组,在干预7、14 d时,分别进行碱性磷酸酶（ALP）和茜素红染色;在干预7、21 d时,采用q-PCR和Westen blot检测 I 型胶原（COLI）、骨钙素（OCN）和Runt相关转录因子2（Runx2）基因和蛋白的表达。采用300±20 g 雄性SD大鼠构建股骨髁 上骨缺损模型,直径为2.5 mm,随机分为3 组,每组6 只,分别每日局部注射0.2 mL溶液等体积PBS（对照组）、10-6 mol/L 和 10-8 mol/L Y1受体拮抗剂溶液,28 d后处死,Micro-CT检测观察骨缺损修复情况。结果ALP和茜素红染色发现,Y1受体拮抗 剂组细胞胞浆内棕色颗粒、细胞外周基质矿化结节均高于对照组,且具有浓度特异性,以10-8 mol/L最为明显;q-PCR及Westem blot检测发现,在成骨分化诱导第7天,10-8 mol/L Y1受体拮抗剂组COLI mRNA和蛋白表达水平均显著高于对照组,差异具有 统计学意义（P<0.05）;在第21天,10-8 mol/L Y1受体拮抗剂组OCN、Runx2 mRNA和蛋白表达明显高于对照组（P<0.05）。通过 micro-CT分析发现,在局部注射10-6 Y1受体拮抗剂28 d后,骨缺损BV/TV、骨密度、骨小梁数量高于对照组,差异均具有统计学 意义（P<0.05）;而骨小梁厚度（P=0.07）、骨体积（P=0.35）在各组之间差异无统计学意义。结论神经肽Y Y1受体拮抗剂可促进 BMSCs成骨分化以及骨缺损的修复,提示阻断Y1受体信号传导具有预防或治疗骨折、骨质疏松症等潜力,为临床药物研究提 供一定的实验依据。