alpha receptor


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Related to alpha receptor: beta receptor

al′pha-recep`tor


n.
a site on a cell that, upon interaction with epinephrine or norepinephrine, controls vasoconstriction, intestinal relaxation, pupil dilation, and other physiological processes. Compare beta-receptor.
[1960–65]
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Noun1.alpha receptor - receptors postulated to exist on nerve cell membranes of the sympathetic nervous system in order to explain the specificity of certain agents that affect only some sympathetic activities (such as vasoconstriction and relaxation of intestinal muscles and contraction of smooth muscles)alpha receptor - receptors postulated to exist on nerve cell membranes of the sympathetic nervous system in order to explain the specificity of certain agents that affect only some sympathetic activities (such as vasoconstriction and relaxation of intestinal muscles and contraction of smooth muscles)
sympathetic nervous system - originates in the thoracic regions of the spinal cord; opposes physiological effects of the parasympathetic: reduces digestive secretions; speeds the heart; contracts blood vessels
receptor - a cellular structure that is postulated to exist in order to mediate between a chemical agent that acts on nervous tissue and the physiological response
References in periodicals archive ?
Quantitative analysis of interferon alpha receptor subunit 1 and suppressor of cytokine signaling 1 gene transcription in blood cells of patients with chronic hepatitis C.
Experimental infection in tumor necrosis factor alpha receptor, interferon gamma and interleukin 4 deficient mice by pathogenic Leptospira interrogans.
Estradiol stimulates alpha and beta receptors equally; estrone stimulates the alpha receptor five times more than the beta receptor, meaning that estrone tends to provoke much greater cell proliferation than estradiol.
Second, the relationship between the alpha receptor expression and the plasma noradrenaline concentration was complex and difficult to interpret unequivocally.
The uterus boasts a high concentration of the alpha receptor, and since researchers thought estrogen was only important for female reproduction, they had no reason to go looking for a different receptor in other organs.
This patent pertains to the discovery that the functional polymorphism (Ser/Gly248) in the cytoplasmic domain of Fc alpha receptor (FcAR) determines the proinflammatory potential of serum IgA autoantibodies through cell signaling and production of cytokines such as TNF-alpha, IL-6, and IL-1 in an allele-dependent manner.