Abstract
The sympathetic nervous system is the primary extrinsic control of heart rate and contractility and is activated during periods of stress to compensate for increased cardiovascular demand. Signal transduction by the neurotransmitter norepinephrine via postsynaptic β-adrenoceptors and second messenger pathways increases calcium supply in the myocardium, leading to enhanced contractile function. Clinical evidence demonstrates elevated sympathetic tone in cardiovascular disease, resulting in altered expression patterns of multiple proteins involved in sympathetic neuronal transmission. Molecular imaging techniques have been developed targeting these proteins by single-photon emission computed tomography (SPECT) or positron emission tomography (PET). A number of radiotracers have been developed, evaluated, and deployed targeting presynaptic neuronal function (uptake-1 norepinephrine reuptake pathway), postsynaptic α- and β-adrenoceptor density, and second messenger systems (adenylate cyclase/cyclic adenosine monophosphate (cAMP) and phospholipase C/inositol trisphosphate cascades). While the majority of clinical applications to date have utilized analogues of norepinephrine including 123I-metaiodobenzylguanidine ([123I]-MIBG) with SPECT and 11C-meta-hydroxyephedrine ([11C]-mHED) with PET, recent studies have demonstrated added value to multitracer approaches, providing insight not only into neuronal function but also into receptor binding and downstream signaling. In this chapter, the physiology of sympathetic neuronal signaling is discussed with attention to specific targets of current radiotracers in molecular imaging. A summary of the available tracers that have been evaluated in preclinical and clinical settings is provided, with particular attention to those tracers currently utilized in patients.
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Abbreviations
- AC:
-
Adenylate cyclase
- AR:
-
Adrenoceptor
- ATP:
-
Adenosine triphosphate
- BNP:
-
B-type natriuretic peptide
- cAMP:
-
Cyclic adenosine monophosphate
- COMT:
-
Catechol-O-methyltransferase
- DA:
-
Dopamine
- DDC:
-
DOPA-decarboxylase
- DOPA:
-
Dihydrxoyphenylalanine
- DβH:
-
Dopamine-β-hydroxylase
- Epi:
-
Epinephrine
- ICD:
-
Implantable cardioverter-defibrillator
- IP3:
-
Inositol trisphosphate
- IPKI:
-
Isoquinolinesulfonamide protein kinase inhibitor
- MAO:
-
Monoamine oxidase
- NE:
-
Norepinephrine
- NYHA:
-
New York Heart Association
- PDE:
-
Phosphodiesterases
- PDE4:
-
Phosphodiesterase-4
- PET:
-
Positron emission tomography
- PKA:
-
Protein kinase A
- PKC:
-
Protein kinase C
- PLC:
-
Phospholipase C
- PMNT:
-
Phenylethanolamine methyltransferase
- SNARE:
-
Soluble N-ethylmaleimide-sensitive factor attachment protein receptor
- SPECT:
-
Single-photon emission computed tomography
- TH:
-
Tyrosine hydroxylase
- t-SNARE:
-
Target-SNARE
- Tyr:
-
Tyrosine
- VMAT2:
-
Vesicular monoamine transporter 2
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Thackeray, J.T., DaSilva, J.N., Elsinga, P.H. (2015). Tracers for Sympathetic Cardiac Neurotransmission Imaging. In: Slart, R., Tio, R., Elsinga, P., Schwaiger, M. (eds) Autonomic Innervation of the Heart. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-45074-1_5
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