Mikael Tiger

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The aim of the present clinical positron emission tomography study was to examine if the 5-HTT is a common target, both for tricyclic antidepressants (TCAs) and selective serotonin reuptake inhibitors (SSRIs). Serotonin transporter (5-HTT) occupancy was estimated during treatment with TCA, SSRI and mirtazapine in 20 patients in remission from depression.(More)
PURPOSE Age-related changes in the serotonin system have been described, and proposed to be associated with behavioral changes observed particularly in the elderly population. The 5-HT1B receptor is thought to have a regulatory role in a number of physiological functions, and has been implicated in several age-related diseases. The purpose of the present(More)
Impairment of the central serotonin system in Parkinson's disease (PD) has been shown postmortem and in vivo with positron emission tomography (PET). The aim of this PET study was to examine and compare the availability of the 5-hydroxytryptamine (5-HT)(1B)-receptor subtype in patients with PD and age-matched control subjects. Twelve control subjects and 12(More)
Most G protein-coupled receptors are desensitized by a uniform two-step mechanism: phosphorylation followed by arrestin binding and internalization. In this study we explored the time-, ligand-, and concentration dependence of alpha2-adrenoceptor internalization in human embryonal kidney (HEK-293) cells expressing alpha2A- and alpha2B-adrenoceptors. We also(More)
Major depression is a significant contributor to the global burden of disease, and its pathophysiology is largely unknown. The serotonin hypothesis is, however, the model with most supporting data, although the details are only worked out to some extent. Recent clinical imaging measurements indeed imply a role in major depressive disorder (MDD) for the(More)
The pathophysiology of major depressive disorder (MDD) is not fully understood and the diagnosis is largely based on history and clinical examination. So far, several lines of preclinical data and a single imaging study implicate a role for the serotonin1B (5-HT1B) receptor subtype. We sought to study 5-HT1B receptor binding in brain regions of reported(More)
[(11) C]AZ10419369 is sensitive to pharmacologically enhanced endogenous serotonin levels. Twelve healthy volunteers underwent [(11) C]AZ10419369 PET and lumbar puncture. There were no correlations between [(11) C]AZ10419369 binding and concentrations of serotonin and its metabolite 5-HIAA in cerebrospinal fluid, suggesting that [(11) C]AZ10419369 brain(More)
Major depressive disorder (MDD) has a lifetime prevalence of 11–15% (Bromet et al., 2011) and is the leading cause of disability worldwide (World Health Organization, 2017). It is a clinically heterogeneous disease of variable course in which the core symptoms, low mood and loss of interest, are related to emotional dysregulation. Recent research has(More)
Cover picture: Summation PET images of an untreated reference subject (left) and of a patient treated with an SSRI (citalopram, right), after intravenous injection of [ 11 C]MADAM. All previously published papers were reproduced with permission from the publisher. ABSTRACT The serotonin system has been implicated in major depression since the 1960s, mainly(More)
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