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National Repository of Grey Literature 1 records found  Search took 0.00 seconds. 
The Mode of Catecholamine Adrenergic Action in Human Peripheral Mononuclear Blood Cells
 MIKULKA, Aleš
Effects of {$\alpha$}1, {$\alpha$}2, {$\beta$}3 adrenergic agonists on resting oxygen consumption and effects of {$\alpha$} and {$\beta$}2 adrenergic antagonists on noradrenaline stimulated oxygen consumption of the human peripheral blood mononuclear cells (PBMC) were studied using the Clark oxygen electrode. It was found that, the {$\alpha$}2 agonist increases slightly the resting oxygen consumption in the PBMC while, the {$\beta$}2 and the {$\alpha$} antagonists inhibit the noradrenaline stimulated oxygen consumption considerably. The {$\alpha$}1 and {$\beta$}3 agonists have no effect on the resting oxygen consumption. The NA termogenesis in the PBMC is mediated by {$\beta$}1 (25%), {$\beta$}2 (8%) and {$\alpha$}2 (12%) adrenergic receptors and not by {$\beta$}3 adrenoreceptors. The NA thermogenesis in the PBMC is mediated by different adrenoreceptors than the NA thermogenesis in the brown adipose tissue. The NA thermogenesis of PBMC is independent on the presence of organic substrates in the cultivation medium. Administration of external substrates (glucose, glutamine, methionine) to the medium has no effect on resting and NA stimulated oxygen consumption of PBMC, while administration of cysteine increases NA stimulated oxygen consumption considerably, indicating that acetyl-CoA could be an important substrate for NA thermogenesis in PBMC.
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