Rabbit anti-Human alpha 2a Adrenergic Receptor polyclonal antibody

Objective Clozapine-induced sialorrhea (CIS) is a common, inconvenient and socially stigmatizing adverse effect. The pathophysiology of CIS may be related to the effect of clozapine on the muscarinic and adrenergic receptors as well as the disruption of the circadian rhythms. The aim of this study was to find out if polymorphisms in muscarinic M1 and M3 receptor genes (CHRM1 and CHRM3), adrenoceptor alpha 2A gene (ADRA2A) or clock circadian regulator gene (CLOCK) are associated with CIS. Methods Two hundred and thirty-seven clozapine-treated Finnish schizophrenia patients were genotyped for CHRM1, CHRM3, CLOCK and ADRA2A polymorphisms, and their salivary dysfunction was assessed with two questions. Twenty-six of these patients had previously been on medication to treat CIS. Comparisons of the genotypes between patients with excessive versus non-excessive salivation were analysed. Genotype distributions between patients and control group and haplotypes were also studied. Results CHRM1, CHRM3 and CLOCK polymorphisms and haplotypes were not associated with CIS. ADRA2A (rs1800544) genotype was associated with CIS (p = 0.029). In patients with CIS, CC genotype (n = 103) was more common than in G-allele carriers (n = 79) (p = 0.013, OR 2.13, 95% CI: 1.17-3.88). No differences were found in the distributions of genotypes between patients and controls. Conclusions ADRA2A genotype was associated with CIS. Copyright (C) 2014 John Wiley & Sons, Ltd.

The thyroid hormone metabolite 3-iodothyronamine (3-T1AM) exerts diverse physiological reactions such as a decrease of body temperature, and negative inotropic and chronotropic effects. This observed pleomorphic effect in physiology can be barely explained by interaction with only one target protein such as the trace-amine receptor 1 (TAAR1), a class A G-protein coupled receptor (GPCR). Moreover, Taar1 knock-out mice still react to 3-T1AM through physiological responses with a rapid decrease in body temperature. These facts propelled our group and others to search for further targets for this molecule. The group of TAARs evolved early in evolution and, according to sequence similarities, they are closely related to adrenoceptors and other aminergic receptors. Therefore, several of these receptors were characterized by their potential to interplay with 3-T1AM. Indeed, 3-T1AM acts as a positive allosteric modulator on the beta2-adrenoceptor (ADRB2) and as a biased agonist on the serotonin receptor 1B (5HT1b) and the alpha2-adrenoceptor (ADRA2A). In addition, 3-T1AM was reported to be a weak antagonist at a non-aminergic muscarinic receptor (M3). These findings impressively reflect that such trace amines can unselectively and simultaneously function at different receptors expressed by one cell or at different tissues. In conclusion, the role of 3-T1AM is hypothesized to concert the fine-tuning of specific cell reactions by the accentuation of certain pathways dependent on distinct receptors. 3-T1AM acts as a regulator of signals by blocking, modulating, or inducing simultaneously distinct intracellular signaling cascades via different GPCRs.