B2 adrenergic receptors and morphological changes of the enteric nervous system in colorectal adenocarcinoma

To study the morphology of the enteric nervous system and the expression of beta-2 adrenergic (B2A) receptors in primary colorectal cancer.METHODSIn this study, we included forty-eight patients with primary colorectal cancer and nine patients for control tissue from the excision of a colonic segment for benign conditions. We determined the clinicopathological features and evaluated the immunohistochemical expression pattern of B2A receptors as well as the morphological changes of the enteric nervous system (ENS). In order to assess statistical differences, we used the student t-test for comparing the means of two groups and one-way analysis of variance with Bonferroni’s post hoc analysis for comparing the means of more than two groups. Correlations were assessed using the Pearson’s correlation coefficient.RESULTSB2A receptors were significantly associated with tumor grading, tumor size, tumor invasion, lymph node metastasis (P < 0.05), while there were no statistically significant associations with gender, CRC location and gross appearance (P > 0.05). We observed, on one hand, a decrease of the relative area for both Auerbach and Meissner plexuses with the increase of the tumor grading, and on the other hand, an increase of the relative area of other nervous elements not in the Meissner plexus or in the Auerbach plexus with the tumor grading. For G1 tumors we found that epithelial B2A area showed an inverse correlation with the Auerbach plexus areas [r(14) = -0.531, P < 0.05], while for G2 tumors, epithelial B2A areas showed an indirect variation with both the Auerbach plexus areas [r(14) = -0.453, P < 0.05] and the Meissner areas [r(14) = -0.825, P < 0.01]. For G3 tumors, the inverse dependence increased for both Auerbach [r(14) = -0.587, P < 0.05] and Meissner [r(14) = -0.934, P < 0.05] plexuses.CONCLUSIONB2A receptors play an important role in colorectal carcinogenesis and can be utilized as prognostic factors. Furthermore, study of the ENS in colorectal cancer may lead to targeted molecular therapies.

Relationship between catecholamine level and gene polymorphism of β1 adrenergic receptor G1165C in children with EV71 infection in hand foot and mouth disease

Objective:To investigate the relationship between the levels of plasma adrenaline and norepinephrine and gene polymorphism of β1 adrenergic receptor G1165 C in children with enterovirus 71(EV71) infection in hand foot and mouth disease(HFMD). Methods:The polymerase chain reaction(PCR) was used to detect the expression of gene polymorphism of β1 adrenergic receptor G1165 C in vitro. The levels of plasma adrenaline and norepinephrine were measured by enzyme-linked immunosorbent assay(ELISA). Results:The plasma norepinephrine level of severe group was significantly higher than the mild group in children with EV71 infection in HFMD(P<0.05); however,the levels of plasma adrenalinein in two groups had no statistical differences(P>0.05); There was no significant difference in the distribution of β1 adrenergic receptor G1165 C genotype and allele between EV71 infection group and healthy control group(P> 0.05). Further analysis of EV71 infection group by dividing it into mild and severe groups showed that there was no significant difference in the distribution of genotype and allele between these two groups as well(P> 0.05). There was no significant difference in the levels of epinephrine and norepinephrine in different genotypes of EV71 infection group(P> 0.05),and in the levels of plasma epinephrine and norepinephrine in the mild and severe groups(P> 0.05). Conclusions:As the disease gets worse,the plasma norepinephrine level has a rising trend in children with EV71 infection in HFMD,which is an important indicator to evaluate the progress of the disease. However,the gene polymorphism of eptor G1165 C have no significant correlation,not only with the susceptibility and severit β1 adrenergic recy of EV71 infection in hand,foot and mouth disease,but also with the levels of catecholamine.

Association between essential hypertension and polymorphisms of beta 1 adrenergic receptor gene G1165C (Gly389Arg) in Chinese Mongolian population

BACKGROUND： The prevalences of hypertension, cerebrovascular diseases, etc. are higher in Mongolian population because of the influence of various factors including genetics, geography, diet, etc. Therefore, it is helpful to develop researches on the genetics of various diseases including hypertension in Mongolian population. OBJECTIVE： To analyze the association between the polymorphism of beta1 adrenergic receptor （β1-AR） gene G1165C （Arg389Gly）, an important candidate gene for various diseases of cardiovascular system, and essential hypertension in Mongolian population. DESIGN ： A cross-sectional study SETTINGS： Department of Neurology, the First Affiliated Hospital of Inner Mongolia Medical College; Wulate Houqi Red Cross Society. PARTICIPANTS： The survey was carried out from February 2003 to March 2005. Totally 239 Mongolian residents, whose blood relations of 3 generations were all Mongolians, were selected from Wulate Houqi, Inner Mongolia, and they were all informed with the survey and detected items. Based on the diagnostic standard of hypertension set by WHO in 1999, the subjects were divided into two groups according to the level blood pressure： ① Normal blood pressure group （n=117）： systolic blood pressure （SBP） 〈 140 mm Hg （1 mm Hg =0.133 kPa）, diastolic blood pressure （DBP） 〈 90 mm Hg, and those having histories of cerebrovascular disease, heart disease, diseases of liver, kidney and tiroides, and diabetes mellitus were excluded. ② Essential hypertension group （n=122）： including 51 patients with simple high SBP. All the enrolled subjects had no blood relationship with each other, and had no history of miscegenation. METHODS ： The body height, body mass, waist circumference and blood lipids were measured routinely, and their habits of smoking and drinking were also investigated. Penpheral venous blood （5 mL） was drawn, the genome DNA was extracted, and the polymorphisms of the β1-AR Gl165C （Gly389Arg） genotype were detected with the Sequenom system. Polymerase chain reaction （PCR） experiment and SNP detection were performed in Huada Gene Laboratory of Bejing, then the univariate analysis of variance was applied in the sample comparison among groups, and the chi-square test was used to compare the genotypes and allele frequencies. The odd ratio （OR） and 95% confidence interval （CO were calculated. MAIN OUTCOME MEASURES： The distributions of β1-AR Gl165C （Gly389Arg） genotypes and alleles were observed. RESULTS： A11 the 239 subjects were involved in the analysis of results, and no one missed, ①Comparison of β1-AR G1165C （Gly389Arg） genotypes and allele distnbutions： In Mongolian population, the frequencies of CC and GG＋GC genotypes at β1-AR G1165C （Gly389Arg） site in the essential hypertension group （72%, 28%） were not significantly different from those in the normal blood pressure group （67%, 33%） （xz=0.841, P=-0.359; OR 0.773, 95%Cl： 0.445-1.342）; The frequencies of C and G alleles also had no significant differences between the essential hypertension group （85%, 15%） and the normal blood pressure group （82%, 18%） （x^2=1.136, P=-0.287; OR： 0.769, 95%Cl： 0.747-1.248）. ②The frequencies of CC and GG＋GC genotypes at β1-AR G1165C （Gly389Arg） site had no significant differences between the patients with simple high SBP （71%, 29%） and the normal blood pressure group （x^2=0.250, P=-0.617; OR： 0.833, 95%C/： 0.408-1.703）; The frequencies of C and G alleles were not significantly different between the patients with simple high SBP （86%, 14%） and the normal blood pressure group （x^2=0.670, P=-0.413; OR 0.766, 95%Cl： 0.404-1.453）. CONCLUSION： In Mongolian population, the distributions of the genotypes and alleles of β1-AR Gl165C （Gly389Arg） have no obvious differences between the subjects with normal blood pressure and the patients with essential hypertension （including simple SBP increase）, which suggests that G1165C （Glu389Asp） site of β1-AR gene may be not a genetic mark of essential hypertension and simple high SBP in Mongolian population.

Association of β3 Adrenergic Receptor and Peroxisome Proliferator-activated Receptor Gamma 2 Polymorphisms With Insulin Sensitivity:A Twin Study

Objective To study the effect of β3 adrenergic receptor （β3AR） Trp64Arg and peroxisome proliferator activated receptor gamma 2 （PPAR72） Prol2Ala polymorphisms on insulin resistance. Methods One hundred and eight dizygotic twin pairs were enrolled in this study. Microsatellite polymorphism was used to diagnose zygosity of twins. Insulin sensitivity was estimated with logarithm transformed homeostasis model assessment （HOMA）. PCR-RFLP analysis was performed to detect the variants. As a supplement to the sib-pair method, identity by state （IBS） was used to analyze the association of polymorphisms with insulin sensitivity. Results The genotype frequencies of Trp64Trg, Trp64Arg, and Arg64Arg were 72.3%, 23.8%, and 3.9%, respectively, while the genotype frequencies of Pro12Pro, Pro12Ala, and Ala12Ala were 89.9%, 9.6%, and 0.5%, respectively. For β3AR Trp64Arg the interclass co-twin correlations of Waist-to-hip ratio （WHR）, blood glucose （GLU）, and insulin （INS）, homeostasis model assessment insulin resistance index （HOMA-IR） of the twin pairs sharing 2 alleles of IBS were greater than those sharing 0-1 allele of IBS, and HOMA4R had statistic significance. For PPAR3t2 Prol2Ala most traits of twin pairs sharing 2 alleles of IBS had greater correlations and statistic significance in body mass index （BMI）, WHR, percent of body fat （PBF） and GLU, but there were low correlations of either insulin or HOMA-IR of twin pairs sharing 1 or 2 alleles of IBS. The combined effects of the two variations showed less squared significant twin-pair differences of INS and HOMA-IR among twins sharing 4 alleles of IBS. Condusions β3AR Trp64Arg and PPAR）,2 Pro 12Ala polymorphisms might be associated with insulin resistance and obesity, and there might be slight synergistic effects between this two gene loci, and further studies are necessary to confirm this finding.

Expression of hippocampal adrenergic receptor mRNA in a rat model of depression

Adrenergic receptor dysfunction is suggested as a potential cause of hippocampal vulnerability to stress-related pathology. We examined mRNA expression of adrenergic receptor （AR） subtypes α1-AR, α1-AR, and β1-AR in hippocampal subregions （CA1, CA3, dentate gyrus） using in situ hybridization in a depression model induced by chronic unpredictable mild stress and social isolation, α1-AR mRNA expression was significantly increased in the CA3 and dentate gyrus, β1-AR mRNA was significantly increased in the CA1, and α1-AR mRNA remained unchanged in all regions of depression rats compared with controls. Thus, different AR subtypes exhibit a differing pattern of mRNA expression in various hippocampal subregions following depression.

Autoantibodies against the myocardial β_1-adrenergic and M_2-muscarinic receptors in patients with congestive heart failure

Objective To determine whether autoantibodies against β 1-adrenergic and M 2-muscarinic receptors are related to patients with congestive heart failure (CHF).Methods Both synthetic peptides corresponding to amino acids sequence 197-222 and 169-173 of the second extracellular loops of the β 1 and M 2 receptors were used as antigens to screen sera from 265 patients. 188 were congestive heart failure (CHF) patients with different heart diseases, among them 42 were ischemic cardiomyopathy (ICD) and 52 were idiopathic dilated cardiomyopathy (IDCM),44 were hypertensive heart disease (HHD),50 were rheumatic valvular heart disease (RVHD); 77 were controls, among them 36 were simple hypertension and 41 were healthy donors (NC). Results Positive sera for β 1-adrenergic receptor was found in 45.73% (86/188) of CHF patients, while in the controls it was 10.4% (8/77) ( P <0.01); positive sera for M 2-muscarinic receptor in CHF patients was found in 49.5% (99/188), while in the control it was 11.7% (9/77) ( P <0.01). The positive ratio of autoantibodies against β 1-adrenergic and M 2-muscarinic receptors in CHF patients with cardiac function class Ⅱ-Ⅲ (NYHA) were significantly higher than cardiac function class Ⅳ. The average titer of autoantibodies against β 1-adrenergic and M 2-muscarinic receptors of the former was significantly higher than the latter; 56.1% of patients with autoantibodies against β 1-adrenergic receptor had autoantibodies against M 2-muscarinic receptor. Conclusions Autoantibodies against β 1-adrenergic receptor and M 2-muscarinic receptor were found in sera from heart failure patients with different cardiac diseases. We propose that autoantibodies against β 1 and M 2 receptors are not only related to the IDCM, but also to cardiac structural and functional changes.

Autoantibodies against the myocardial β1-adrenergic and M2-muscarinic receptors in patients with congestive heart failure

Objective To determine whether autoantibodies against β 1-adrenergic and M 2-muscarinic receptors are related to patients with congestive heart failure (CHF).Methods Both synthetic peptides corresponding to amino acids sequence 197-222 and 169-173 of the second extracellular loops of the β 1 and M 2 receptors were used as antigens to screen sera from 265 patients. 188 were congestive heart failure (CHF) patients with different heart diseases, among them 42 were ischemic cardiomyopathy (ICD) and 52 were idiopathic dilated cardiomyopathy (IDCM),44 were hypertensive heart disease (HHD),50 were rheumatic valvular heart disease (RVHD); 77 were controls, among them 36 were simple hypertension and 41 were healthy donors (NC). Results Positive sera for β 1-adrenergic receptor was found in 45.73% (86/188) of CHF patients, while in the controls it was 10.4% (8/77) ( P 【0.01); positive sera for M 2-muscarinic receptor in CHF patients was found in 49.5% (99/188), while in the control it was 11.7% (9/77) ( P 【0.01). The positive ratio of autoantibodies against β 1-adrenergic and M 2-muscarinic receptors in CHF patients with cardiac function class Ⅱ-Ⅲ (NYHA) were significantly higher than cardiac function class Ⅳ. The average titer of autoantibodies against β 1-adrenergic and M 2-muscarinic receptors of the former was significantly higher than the latter; 56.1% of patients with autoantibodies against β 1-adrenergic receptor had autoantibodies against M 2-muscarinic receptor. Conclusions Autoantibodies against β 1-adrenergic receptor and M 2-muscarinic receptor were found in sera from heart failure patients with different cardiac diseases. We propose that autoantibodies against β 1 and M 2 receptors are not only related to the IDCM, but also to cardiac structural and functional changes.

Blocking beta 2-adrenergic receptor inhibits dendrite ramification in a mouse model of Alzheimer's disease

Dendrite ramification affects synaptic strength and plays a crucial role in memory. Previous studies revealed a correlation between beta 2-adrenergic receptor dysfunction and Alzheimer＇s disease （AD）, although the mechanism involved is still poorly understood. The current study investigated the potential effect of the selective β2-adrenergic receptor antagonist, ICI 118551 （ICI）, on Aβ deposits and AD-related cognitive impairment. Morris water maze test results demonstrated that the performance of AD-transgenic （TG） mice treated with ICI （AD-TG/ICI） was significantly poorer compared with NaCl-treated AD-TG mice （AD-TG/NaCl）, suggesting that β2-adrenergic receptor blockage by ICI might reduce the learning and memory abilities of mice. Golgi staining and immunohistochemical staining revealed that blockage of the β2-adrenergic receptor by ICI treatment decreased the number of dendritic branches, and ICI treatment in AD-TG mice decreased the expression of hippocampal synaptophysin and synapsin 1. Western blot assay results showed that the blockage of β2-adrener- gic receptor increased amyloid-β accumulation by downregulating hippocampal a-secretase activity and increasing the phosphorylation of amyloid precursor protein. These findings suggest that blocking the β2-adrenergic receptor inhibits dendrite ramification of hippocampal neurons in a mouse model of AD.

ADRB1 Arg389Gly多态性对比索洛尔疗效影响的Meta分析

目的探索ADRB1 Arg389Gly多态性对比索洛尔疗效的影响,为比索洛尔个体化药物治疗提供参考。方法从PubMed、Embase、Cochrane Library、中国生物医学文献服务系统、中国知网、万方等数据库系统性搜索与比索洛尔和ADRB1 Arg389Gly多态性相关的文献,检索时间为建库至2023年5月。根据研究制定的纳入与排除标准筛选、提取相关文献并进行文献质量评估。使用RevMan 5.4软件对相关结局指标进行Meta分析。结果最终纳入7项研究,共计1339人次。其中4项研究涉及比索洛尔治疗前后收缩压(SBP)和舒张压(DBP)的变化量(ΔSBP和ΔDBP),有4项研究涉及治疗前后左室射血分数(LVEF)的变化量(ΔLVEF)。研究结果显示,比索洛尔对ADRB1 Arg389Gly野生组(AA)和突变组(AG+GG)血压改善的差异均无统计学意义{ΔSBP[SMD=0.17,95%CI(-0.97,1.31),P=0.77]、ΔDBP[SMD=-0.01,95%CI(-0.65,0.62),P=0.97]};比索洛尔对两组ΔLVEF改善的差异亦无统计学意义[SMD=-0.61,95%CI(-2.74,1.53),P=0.58]。结论ADRB1 Arg389Gly多态性对比索洛尔改善心血管患者SBP、DBP和LVEF的作用无显著影响。

β_(1)肾上腺素受体自身抗体激活对心室空间电生理特性的影响及其干预研究

目的室性心律失常的发生与β_(1)肾上腺素受体自身抗体(β_(1)AAbs)有关。本研究旨在探讨β_(1)AAbs对大鼠心室空间电生理特性的作用及干预效果。方法将30只6~8周龄雄性SD大鼠(体重180~220 g)随机分为3组(每组n=10):对照组、β_(1)AAbs组和比索洛尔组。在0、2、4、6周经背部多点注射β_(1)肾上腺素受体第二细胞外环抗原肽建立主动免疫室性心律失常易感模型。测定不同时间节点的血清β_(1)AAbs水平验证模型。在心室不同区域测量电生理参数心室有效不应期、有效不应期离散度、传导速度和传导异质性。马松染色检测心室组织不同区域的纤维化水平。结果与对照组相比,β_(1)AAbs组与比索洛尔组自第2~8周β_(1)AAbs水平显著增高(P<0.05)。与对照组和比索洛尔组相比,β_(1)AAbs组的心率显著增加,RR间期、QT间期和QTc间期明显缩短(P<0.05);不同区域心室有效不应期均明显缩短,有效不应期离散度显著增加(P<0.05),不同区域传导速度减慢、传导异质性增加(P<0.05),不同部位胶原容积百分比明显升高(P<0.05),以上参数改变在中间部最为明显,均可被比索洛尔逆转(P<0.05)。结论β_(1)AAbs可增加心室空间电生理特性改变,其潜在机制可能与不同区域纤维化程度有关,比索洛尔具有潜在治疗价值。

β_(1)-肾上腺素能受体基因多态性对STEMI患者室性心律失常和短期预后的影响

目的:分析β_(1)-肾上腺素能受体基因多态性对急性ST段抬高型心肌梗死(STEMI)患者室性心律失常以及6个月预后的影响。方法:采用回顾性队列研究方式,按照纳入与排除标准选择云浮市人民医院2021年1月至2023年2月间收治的STEMI患者为研究对象,采用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)分析患者β_(1)-肾上腺素能受体Arg389Gly基因型多态性,并根据β_(1)-肾上腺素能受体Arg389Gly基因型多态性类别分为CC组(Arg389Arg,87例)、CG组(Arg389Gly,73例)和GG组(Gly389Gly,18例)三组。对比三组患者收集的入院临床资料[包括Killip分级、心率、收缩压、舒张压、左心室射血分数(LVEF)、左心室舒张末径(LVDD),以及血清肿瘤坏死因子α(TNF-α)、N末端B型利钠肽前体(NT-proBNP)、肌酸激酶同工酶(CK-MB)、超敏C反应蛋白(hs-CRP)等]和出院后通过门诊或电话对其进行6个月随访的结果(包括心率、NT-proBNP、CK-MB、LVEF、LVDD及主要心脏不良事件)的差异。结果:研究共纳入178例STEMI合并室性心律失常的患者,其中CC组有87例(48.9%),CG组有73例(41.0%),GG组有18例(10.1%);三组患者的年龄、性别、体重、BMI、吸烟史、饮酒史、合并疾病、收缩压、舒张压、心率、Killip分级(Ⅲ和Ⅳ级)以及血清TNF-α、NT-proBNP、CK-MB、hs-CRP及LVEF和LVDD均没有显著差异(P>0.05);随访6个月GG组和CG组心功能各项指标结果均显著优于CC组(P<0.05),而GG组的NT-proBNP和CK-MB结果显著低于CG组(P<0.05);统计三组患者随访期间主要心脏不良事件的发生情况,显示CC组的总发生数为17例(19.5%),CG组的总发生数为5例(6.9%),GG组的总发生数为1例(5.6%),组间差异显著(χ^(2)=6.887,P<0.05)。结论:β_(1)-肾上腺素能受体Arg389Gly基因多态性与STEMI合并室性心律失常患者的病情严重程度无关,但与治疗后心功能改善情况以及短期预后有关。

ADRB1基因多态性对比索洛尔疗效影响的Meta分析

目的基于Meta分析评价β_(1)肾上腺素受体(ADRB1)389位点(rs 1801253)基因多态性对比索洛尔疗效的影响。方法通过计算机检索中国知网、维普网、万方数据知识服务平台、Web of Science、PubMed等数据库收集关于ADRB1与比索洛尔研究的文献,检索时间为建库至2023年7月。研究人员对发表的文献进行筛选,并将纳入文献进入质量评价,提取文献数据,对纳入文献结局指标使用Review Manager 5.3软件进行Meta分析。结果最终纳入文献6篇,其中Gly389Gly(GG型)69例,Gly389Arg(GC型)458例,Arg389Arg(CC型)611例。在降收缩压、舒张压及控制心率疗效方面,GG与CC基因型差异无统计学意义(P=0.96,P=0.84,P=0.87),GC与CC基因型差异无统计学意义(P=0.43,P=0.35,P=0.07),GG与GC基因型差异亦无统计学意义(P=0.60,P=0.68,P=0.77)。结论在比索洛尔降压及控制心率方面,ADRB1389位点基因多态性对其疗效影响并不明显。GG、GC及CC 3个基因型之间均未发现明显差异。

不同浓度β_(1)肾上腺素能受体自身抗体对大鼠心电指标和心肌病理的早期影响

目的探讨不同浓度β_(1)肾上腺素能受体自身抗体(β_(1)-adrenergic receptor autoantibodies,β_(1)AAbs)对大鼠心电指标及心肌细胞病理的早期影响。方法24只雄性SD大鼠随机分为对照组,免疫组(低浓度组、中浓度组、高浓度组),免疫组经尾静脉注射β_(1)AAbs建立被动免疫β_(1)AAbs升高模型,通过酶联免疫吸附试验测定大鼠心肌组织中环磷酸腺苷(cAMP)含量,验证造模是否成功。各组大鼠均佩戴穿戴式心电传感器在自然状态下连续监测5 d,分析心率,昼夜节律;使用LEAD-7000心电生理仪记录大鼠基线、免疫第一天、第三天、第五天的6导心电图,免疫5 d后行大鼠心肌细胞HE染色。结果(1)各组大鼠夜间心率均高于白天,各免疫组5 d内平均心率较对照组增快(P<0.05);(2)免疫低浓度组在免疫第四天达到心率高峰;中浓度组在免疫5 d内心率持续增快;高浓度组在免疫第二天达到心率高峰,第三天开始下降(P<0.05);(3)各免疫组P波时限延长,免疫中、高浓度组P波振幅增高,免疫低浓度组QTc间期延长,免疫低、中浓度组QRS波振幅增高(P<0.05);(4)免疫低、中浓度组心肌细胞完整性降低,免疫高浓度组心肌细胞明显碎裂,细胞核空泡状。结论β_(1)AAbs增高早期可增加大鼠心率,延长P波时限;低浓度β_(1)AAbs延长QTc间期;低、中浓度β_(1)AAbs可使心肌细胞完整性降低,高浓度使心肌细胞碎裂。

消癃通闭对α_1-肾上腺素受体的拮抗作用

目的 :研究消癃通闭对α1 肾上腺素受体 (α adrenoceptor,α1 AR)的拮抗作用 ,为寻找有治疗作用的先导化合物提供理论依据。方法 :(1)采用放射配体结合实验 ,在犬脑细胞膜中分别加入标记后的12 5I BE2 2 5 4和 15种浓度的消癃通闭 ,测定其放射性活度。通过Hill作图求出IC50 值 ;(2 )采用离体组织收缩功能实验 ,测定消癃通闭对去甲肾上腺素介导离体大鼠前列腺收缩的拮抗作用 ,求得 pKB 值。结果 :消癃通闭对12 5I BE2 2 5 4与犬大脑皮层α1 AR的结合呈竞争性抑制作用 ,其半效抑制 (质量 )浓度IC50 为 (34 .0± 6 .0 ) g·L-1,Hill系数为 0 .7。消癃通闭可使α1 AR介导的大鼠前列腺平滑肌收缩效应曲线平行右移 ,消癃通闭在两种不同浓度时 ,其拮抗的 pKB 值分别为(37.0± 11.0 ) g·L-1和 (30 .0± 8.0 ) g·L-1。结论 :消癃通闭对α1

β1-肾上腺素受体、血管紧张素Ⅱ-1型受体基因多态性与高寒地区高血压的关系研究

背景高血压是最常见的慢性心血管病,也是全球疾病负担的主要原因,我国高血压发病率存在着地域差异,其中高寒地区高血压患者明显多于非高寒地区,这主要由生活环境和遗传因素决定,本文将从遗传学的角度对高血压的发病进行研究。目的探究β1-肾上腺素受体(ADRB1)、血管紧张素Ⅱ-1型受体(AGTR1)基因多态性与高寒地区高血压的关系。方法选取2014年8月—2017年2月于佳木斯大学附属第一医院高血压和心内科门诊就诊及住院的符合研究标准的高血压患者1084例,其中546例进行ADRB1基因检测(记为高寒地区1组),702例进行AGTR1基因检测(记为高寒地区2组)。选取同期于本院进行体检的健康且未服用任何药物的志愿者169例(记为对照组受试者)。采用荧光染色原位杂交法检测所有受试者ADRB1、AGTR1基因型。比较高寒地区1组与对照组受试者ADRB1基因型、等位基因频率,高寒地区2组与对照组受试者AGTR1基因型、等位基因频率;并分析高寒地区高血压患者与非高寒(北京、湖南、福建)地区高血压患者及高寒地区健康人群与非高寒(北京、湖南、福建)地区高血压患者ADRB1、AGTR1基因型、等位基因频率。结果高寒地区1组与对照组受试者ADRB1基因型比较,差异无统计学意义(P>0.05);高寒地区1组与对照组受试者ADRB1等位基因频率比较,差异有统计学意义(P<0.05)。高寒地区2组与对照组受试者AGTR1基因型、等位基因频率比较,差异无统计学意义(P>0.05)。高寒地区1组高血压患者与北京地区、湖南地区、福建地区高血压患者ADRB1基因型、等位基因频率比较,差异无统计学意义(P>0.05)。高寒地区2组高血压患者与北京地区高血压患者AGTR1基因型、等位基因频率比较,差异无统计学意义(P>0.05);高寒地区2组高血压患者与湖南地区、福建地区高血压患者AGTR1基因型、等位基因频率比较,差异有统计学意义(P<0.05)。对照组受试者与北京地区高血压患者ADRB1基因型比较,差异有统计学意义(P<0.05);对照组受试者与北京地区高血压患者ADRB1等位基因频率比较,差异无统计学意义(P>0.05);对照组受试者与湖南、福建地区高血压患者ADRB1基因型、等位基因频率比较,差异无统计学意义(P>0.05)。对照组受试者与北京地区高血压患者AGTR1基因型、等位基因频率比较,差异无统计学意义(P>0.05);对照组受试者与湖南、福建地区高血压患者AGTR1基因型、等位基因频率比较,差异有统计学意义(P<0.05)。结论ADRB1基因C等位基因与高寒地区高血压发病相关,暂未发现AGTR1基因多态性与高寒地区高血压发病相关。

大鼠内毒素性肺损伤中肺α_1和β受体的变化

本研究动态观察大鼠内毒素性肺损伤中肺α１－和β－ＡＲ的变化，以探讨肺ＡＲ变化与急性肺损伤的关系及其机制。结果表明，内毒素诱导大鼠急性肺损伤过程中，肺α１－ＡＲ和β－ＡＲ的Ｂｍａｘ值均明显降低（下调），分别较对照组下降３５和４３％。β－ＡＲ下调可能是导致急性肺损伤的原因之一；α－ＡＲ下调则是一种保护性反应。活性氧在肺ＡＲ下调中起重要作用，而循环血去甲肾上腺素和肾上腺素水平的升高不是其主要因素。

大鼠高位脊髓损伤后α_1-肾上腺素受体表达变化

目的:观察大鼠高位脊髓损伤后,脊髓损伤段及其邻近上下段α1 肾上腺素受体表达的变化,旨在探讨临床自主高反射下严重高血压发生的可能机制。方法:健康雄性Wistar大鼠42只,随机分为2 组:假手术组(6 只)和脊髓损伤组(36 只)。采用改良Allens打击法,建立脊髓T4节段重度损伤动物模型。假手术组仅咬除椎板,未打击脊髓。分别于损伤后1 d、3 d、1周、2周、3周和4周各处死脊髓损伤动物6只,取损伤段及邻近上下段脊髓,假手术组亦取相应不同节段脊髓组织。采用RT PCR法测定脊髓不同节段α1 肾上腺素受体mRNA表达情况。结果:与假手术组相比,脊髓损伤段以上节段在损伤后1 d受体表达无明显变化,但3 d后表达减少(P<0.05),1周时降至最低(P<0.01),此后表达开始增加,2 周时与假手术组无明显差异,至损伤后4周受体表达未见明显变化;损伤段在损伤后受体表达持续减少(P<0.05),损伤后1周达最低(P<0.01),此后受体表达开始逐步增加,但至损伤后4周仍未超过假手术组(P<0.05);损伤段以下节段在损伤后1 d受体表达显著减少(P<0.01),损伤后3 d受体表达接近假手术组,此后受体表达持续增加,至损伤后4 周受体表达超过假手术组(P<0.05)。结论:大鼠高位脊髓损伤4周后,脊髓损伤段以下节段α1 肾上腺素受体表达增加。α1 肾上腺素受体数目上调?

糖尿病肾病患者抗血管紧张素Ⅱ的1型受体和肾上腺素能α_1受体自身抗体改变的观察

目的探讨2型糖尿病(T2DM)抗血管紧张素Ⅱ的1型受体(AT1)和肾上腺素能α1(Adrα1)受体自身抗体与肾功能不全的关系。方法以合成的AT1和Adrα1受体多肽片段为抗原,应用ELISA技术,检测糖尿病肾病(DN)79例,T2DM52例,40例正常人血清中抗AT1和Adrα1受体自身抗体。结果DN组AT1和Adrα1受体自身抗体阳性率分别为45.6%和32.9%,明显高于T2DM组的13.5%和9.6%及正常对照组的10.0%、12.5%,差异有统计学意义(P<0.01)。结论抗G蛋白偶联AT1和Adrα1受体自身抗体可能与DN的发病有关。

扩张型心肌病患者血清抗β_1肾上腺素受体自身抗体生物学效应

目的研究扩张型心肌病(DCM)患者血清中抗β1肾上腺素能受体(β1-AR)自身抗体的生物学效应及其作用机制。方法采用酶联免疫吸附测定(SA-ELISA)技术,检测39例DCM患者和97例正常人血清标本中的抗β1-AR自身抗体;利用亲和层析法纯化抗体阳性和阴性血清中的IgG,观察抗β1-AR自身抗体对乳鼠心肌细胞搏动频率和成年大鼠心肌细胞腺苷酸环化酶活性的影响。结果DCM患者血清中抗β1-AR自身抗体的阳性率和抗体滴度明显高于正常人;纯化的抗β1-AR自身抗体IgG既可增加乳鼠心肌细胞的搏动频率,又可增强成鼠心肌细胞腺苷酸环化酶的活性,使cAMP产生量增加。结论DCM患者血清中的抗β1-AR自身抗体对心脏的β1-AR具有激动剂样正性变时效应,该自身抗体可能通过β1AR-Gs-AC-cAMP-PKA信号通路起作用。

糖尿病肾病患者治疗前后血清中抗AT1、α1、β1及M2受体水平变化及其临床意义

目的探讨糖尿病肾病(DN)患者治疗前后血清中抗血管紧张素Ⅱ受体1型(AT 1-受体)、α1-肾上腺素受体(α1-受体)、β1肾上腺素受体(β1-受体)及M 2胆碱能受体(M 2-受体)水平变化及其临床意义。方法纳入DN患者115例(DN组)、2型糖尿病(T2DM)患者65例(T2DM组)和健康体检者46例(NC组),检测DN组、T2DM组治疗前及治疗8周后和NC组的相关实验室指标和自身抗体阳性率,分析两者相关性及不同疗效对自身抗体阳性率的影响,并将治疗前AT 1、α1、β1及M 2受体水平诊断DN做ROC曲线分析。结果治疗后,DN组、T2DM组的尿素氮(BUN)、肌酐(Scr)、尿白蛋白排泄率(Urea)值显著降低(P<0.05),肾小球过滤率(GFR)显著提高(P<0.05),差异均有统计学意义(P<0.05);治疗后,DN组AT 1、α1、β1及M 2受体阳性率显著降低(P<0.05),显著低于治疗前(P<0.05)、T2DM组治疗后(P<0.05)和NC组(P<0.05),差异有统计学意义(P<0.05);DN组患者中,AT 1受体、α1受体、β1受体、M 2受体与血BUN、血Scr、尿Urea呈显著正相关性(P<0.05),与GFR呈显著负相关性(P<0.05);DN治疗有效组的AT 1、α1、β1及M 2受体阳性率显著低于无效组(P<0.05);治疗前AT 1、α1、β1及M 2受体水平诊断DN做ROC曲线分析发现,四者受体和其联合诊断DN的曲线下的面积(AUC)分别为0.669、0.676、0.711、0.675和0.724,灵敏度分别为87.7%、90.8%、89.2%及92.3%和92.3%,特异性分别为53.9%、55.7%、47.0%及57.4%和50.4%。结论AT 1、α1、β1及M 2受体不仅可反映DN患者慢性肾功能不全情况,还可预测DN疗效,临床诊断价值确切。