Abstract:
PURPOSE:Positron emission tomography (PET) imaging of serotonin 2A (5-HT(2A)) receptors with agonist tracers holds promise for the selective labelling of 5-HT(2A) receptors in their high-affinity state. We have previously validated [(11)C]Cimbi-5 and found that it is a 5-HT(2A) receptor agonist PET tracer. In an attempt to further optimize the target-to-background binding ratio, we modified the chemical structure of the phenethylamine backbone and carbon-11 labelling site of [(11)C]Cimbi-5 in different ways. Here, we present the in vivo validation of nine novel 5-HT(2A) receptor agonist PET tracers in the pig brain. METHODS:Each radiotracer was injected intravenously into anaesthetized Danish Landrace pigs, and the pigs were subsequently scanned for 90 min in a high-resolution research tomography scanner. To evaluate 5-HT(2A) receptor binding, cortical nondisplaceable binding potentials (BP(ND)) were calculated using the simplified reference tissue model with the cerebellum as a reference region. RESULTS:After intravenous injection, all compounds entered the brain and distributed preferentially into the cortical areas, in accordance with the known 5-HT(2A) receptor distribution. The largest target-to-background binding ratio was found for [(11)C]Cimbi-36 which also had a high brain uptake compared to its analogues. The cortical binding of [(11)C]Cimbi-36 was decreased by pretreatment with ketanserin, supporting 5-HT(2A) receptor selectivity in vivo. [(11)C]Cimbi-82 and [(11)C]Cimbi-21 showed lower cortical BP(ND), while [(11)C]Cimbi-27, [(11)C]Cimbi-29, [(11)C]Cimbi-31 and [(11)C]Cimbi-88 gave rise to cortical BP(ND) similar to that of [(11)C]Cimbi-5. CONCLUSION:[(11)C]Cimbi-36 is currently the most promising candidate for investigation of 5-HT(2A) receptor agonist binding in the living human brain with PET.
journal_name
Eur J Nucl Med Mol Imagingauthors
Ettrup A,Hansen M,Santini MA,Paine J,Gillings N,Palner M,Lehel S,Herth MM,Madsen J,Kristensen J,Begtrup M,Knudsen GMdoi
10.1007/s00259-010-1686-8subject
Has Abstractpub_date
2011-04-01 00:00:00pages
681-93issue
4eissn
1619-7070issn
1619-7089journal_volume
38pub_type
杂志文章abstract:PURPOSE:To determine whether the metabolic features of breast tumours differ among molecular subtypes. METHODS:This prospective study included 168 women diagnosed with locally advanced breast cancer. PET/CT was requested in the initial staging before neoadjuvant treatment (multicentre study, FISCAM grant). All patient...
journal_title:European journal of nuclear medicine and molecular imaging
pub_type: 杂志文章
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更新日期:2013-09-01 00:00:00
abstract:PURPOSE:The objective of this study was to investigate and present the early results on the efficacy, safety, and quality of life of 225Ac-DOTATATE targeted alpha therapy (TAT) in patients with advanced, progressive, 177Lu-DOTATATE refractory, and somatostatin receptor (SSTR) expressing metastatic GEP-NETs. METHODS:In...
journal_title:European journal of nuclear medicine and molecular imaging
pub_type: 杂志文章
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journal_title:European journal of nuclear medicine and molecular imaging
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journal_title:European journal of nuclear medicine and molecular imaging
pub_type: 临床试验,杂志文章,多中心研究
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journal_title:European journal of nuclear medicine and molecular imaging
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journal_title:European journal of nuclear medicine and molecular imaging
pub_type: 临床试验,杂志文章
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journal_title:European journal of nuclear medicine and molecular imaging
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journal_title:European journal of nuclear medicine and molecular imaging
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更新日期:2015-01-01 00:00:00
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journal_title:European journal of nuclear medicine and molecular imaging
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journal_title:European journal of nuclear medicine and molecular imaging
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更新日期:2007-07-01 00:00:00
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pub_type: 临床试验,杂志文章
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journal_title:European journal of nuclear medicine and molecular imaging
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journal_title:European journal of nuclear medicine and molecular imaging
pub_type: 杂志文章
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更新日期:2004-06-01 00:00:00
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journal_title:European journal of nuclear medicine and molecular imaging
pub_type: 杂志文章,多中心研究
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更新日期:2018-09-01 00:00:00
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journal_title:European journal of nuclear medicine and molecular imaging
pub_type: 临床试验,杂志文章
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更新日期:2012-11-01 00:00:00