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.
复制标题
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
中科院分区:
文献类型:
--
作者:
D. Guludec;A. Cohen;J. Delforge;N. Delahaye;A. Syrota;P. Merlet
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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影响因子:
5
作者:
Wei,HB;Yamamura,HI;Roeske,WR
通讯作者:
Roeske,WR
影响因子:
6.1
作者:
Habecker,BA;Tietje,KM;vanKoppen,CJ;Creason,SA;Goldman,PS;Migeon,JC;Parenteau,LA;Nathanson,NM
通讯作者:
Nathanson,NM
DOI:
--
发表时间:
1982
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Galper,JB;Dziekan,LC;O'Hara,DS;Smith,TW
通讯作者:
Smith,TW
影响因子:
37.8
作者:
Vatner,DE;Sato,N;Galper,JB;Vatner,SF
通讯作者:
Vatner,SF
DOI:
10.1172/jci113528
发表时间:
1988
期刊:
The Journal of clinical investigation
影响因子:
--
作者:
Vatner,DE;Lee,DL;Schwarz,KR;Longabaugh,JP;Fujii,AM;Vatner,SF;Homcy,CJ
通讯作者:
Homcy,CJ