Increased myocardial muscarinic receptor density in idiopathic dilated cardiomyopathy: an in vivo PET study.

Increased myocardial muscarinic receptor density in idiopathic dilated cardiomyopathy: an in vivo PET study.
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特发性扩张型心肌病心肌毒蕈碱受体密度增加:体内 PET 研究。

DOI:
10.1161/01.cir.96.10.3416
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发表时间:
1997
期刊:
影响因子:
37.8
通讯作者:
P. Merlet
P. Merlet
中科院分区:
医学1区
文献类型:
--
作者:
D. Guludec;A. Cohen;J. Delforge;N. Delahaye;A. Syrota;P. Merlet

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背景 充血性心力衰竭与受刺激的心肌腺苷酸环化酶活性降低、Gi结合蛋白增加、副交感张力减弱以及副交感激动剂对β-肾上腺素能左心室刺激的调节增加有关。尽管存在这些异常,但尚未在患者中证实心室毒蕈碱受体密度或亲和力的变化。 方法和结果 通过正电子发射断层扫描,使用特异性亲水性拮抗剂 11C-MQNB(苯甲酸甲酯),对 20 名因特发性扩张型心肌病(平均左心室射血分数,22+/-9%)导致的充血性心力衰竭患者进行无创评估心肌毒蕈碱受体的密度和亲和常数,并与 12个普通科目。患者的平均受体浓度显着高于对照受试者(B'max,34.5+/-8.9 对比 25+/-7.7 pmol/mL,P<.005),亲和常数没有变化。注射0.6 mg冷MQNB后,患者的心率变化低于对照组(34+/-20% vs 55+/-36%,P<.05),并且受体密度与患者的最大心率呈负相关(r=.45,P<.05)。 结论 充血性心力衰竭与心肌毒蕈碱受体的上调有关。这可能是β-激动剂刺激的一种适应性机制,并且应该增加药物干预的潜在靶标的数量。
BACKGROUND Congestive heart failure is associated with decreased stimulated myocardial adenylate cyclase activity, increased Gi-binding protein, attenuated parasympathetic tone, and increased modulation of beta-adrenergic inotropic left ventricular stimulation by parasympathetic agonists. Despite these abnormalities, changes in the density or affinity of ventricular muscarinic receptors have not been demonstrated in patients. METHODS AND RESULTS The density and affinity constants of myocardial muscarinic receptors were evaluated noninvasively by means of positron emission tomography with 11C-MQNB (methylquinuclidinyl benzilate), a specific hydrophilic antagonist, in 20 patients with congestive heart failure due to idiopathic dilated cardiomyopathy (mean left ventricular ejection fraction, 22+/-9%) and compared with values in 12 normal subjects. The mean receptor concentration was significantly higher in patients than in control subjects (B'max, 34.5+/-8.9 versus 25+/-7.7 pmol/mL, P<.005), with no changes in affinity constants. The change in heart rate after injection of 0.6 mg of cold MQNB was lower in patients than in control subjects (34+/-20% versus 55+/-36%, P<.05), and receptor density correlated negatively with maximal heart rate in the patients (r=.45, P<.05). CONCLUSIONS Congestive heart failure is associated with an upregulation of myocardial muscarinic receptors. This may be an adaptive mechanism to beta-agonist stimulation and should increase the number of potential targets for pharmacological intervention.
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发表时间: 1994
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DOI: 10.1172/jci113528
发表时间: 1988
期刊: The Journal of clinical investigation
影响因子: --
作者:
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