Results 151 to 160 of about 14,642 (203)
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Presence of Octopamine and an Octopamine Receptor in Crassostrea virginica.
In vivoOctopamine is a biogenic amine first identified in octopus. It has been well studied in arthropods and a few gastropods, serving as a neurotransmitter and hormone. The presence of octopamine has rarely been reported in bivalves and has not been reported in Crassostrea virginica.
Kerri, Pryce +8 more
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Responsiveness of neurogenic hearts to octopamine
Comparative Biochemistry and Physiology Part C: Comparative Pharmacology, 1975Abstract 1. The neurogenic hearts of the horseshoe crab Limulus polyphemus, the spider Eurypelma marxi, and the lobster Homarus americanus were examined for their responsiveness to octopamine. 2. Octopamine always produced a moderate increase in the rate and strength of the heartbeat when applied to isolated heart preparations of the horseshoe crab ...
D S, Grega, R G, Sherman
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Excretion of octopamine metabolites in neuroblastoma
Clinica Chimica Acta, 1986The urinary concentrations of o-hydroxymandelic acid, m-hydroxymandelic acid, p-hydroxymandelic acid, homovanillic acid and vanillylmandelic acid were determined in 57 healthy children and 9 patients with neuroblastoma. The concentrations of o-hydroxymandelic acid and p-hydroxymandelic were not significantly different for both groups whereas the ...
M W, Couch, D M, Greer, C M, Williams
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DISTRIBUTION AND TURNOVER OF OCTOPAMINE IN TISSUES
Journal of Neurochemistry, 1972Abstract— Octopamine is a normally occurring amine in several species of animals. Particularly high concentrations are found in the crustacean central nerve cord. In the rat it is specifically localized to sympathetic nerve endings, has a subcellular distribution similar to that of norepinephrine, and is asymmetrically distributed in the CNS.
P B, Molinoff, J, Axelrod
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Octopamine fuels fighting flies
Nature Neuroscience, 2008The neural basis of aggression is poorly understood. A study in this issue used genetic scalpels to dissect the circuitry of the fly brain and identified a small cluster of octopaminergic neurons that can make a fly fighting mad.
Christopher J, Potter, Liqun, Luo
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Science, 1973
An adenylate cyclase that is activated specifically by very low concentrations of octopamine has been identified both in homogenates and in intact cells of the thoracic ganglia of an insect nervous system. This enzyme appears to be distinct from two other adenylate cyclases present in the same tissue, which are activated by dopamine and by 5 ...
J A, Nathanson, P, Greengard
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An adenylate cyclase that is activated specifically by very low concentrations of octopamine has been identified both in homogenates and in intact cells of the thoracic ganglia of an insect nervous system. This enzyme appears to be distinct from two other adenylate cyclases present in the same tissue, which are activated by dopamine and by 5 ...
J A, Nathanson, P, Greengard
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High-affinity octopamine receptors revealed in Drosophila by binding of [3H]octopamine
Neuroscience Letters, 1982The study describes, for the first time, detection of a putative, high-affinity octopamine receptor by direct binding studies with a radiolabeled ligand. Crude membranes prepared from heads of Drosophila melanogaster bind [3H]octopamine at a level of 0.4 pmol per mg protein with an apparent Kd of 5 nM.
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Octopamine in leeches—I. Distribution of octopamine in Macrobdella decora and Erpobdella octoculata
Comparative Biochemistry and Physiology Part C: Comparative Pharmacology, 1980Abstract 1. The nervous and other tissues of the leeches M. decora and E. octoculata were asayed for octopamine using a radiochemical-enzymatic technique. 2. Octopamine was found at mean concentrations of 12–40 ng/mg tissue protein in the ganglionated nervous tissue; lesser amounts of 7.4–19 ng/mg tissue protein were observed in the non-ganglionated
Rodney A. Webb, I. Orchard
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-Octopamine as a substrate for monoamine oxidase
Life Sciences, 1979Abstract m -Octopamine was characterized as substrate for monoamine oxidase (MAO) in rat brain and liver mitochondria. The K m and V max values of the brain enzyme were 735 μM and 32.5 nmoles/mg protein/30 min, and those of the liver enzyme 351 μM and 125 nmoles/mg protein/30 min, respectively.
O, Suzuki +3 more
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Journal of Experimental Biology, 1998
ABSTRACT Octopamine release has been demonstrated from the dorsal unpaired median neurone to the locust extensor-tibiae muscle (DUMETi) in response to high-[K+] saline. Here, we provide evidence for the existence of presynaptic inhibitory autoreceptors for octopamine on the DUMETi terminals and report on their pharmacological profile ...
, Howell, , Evans
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ABSTRACT Octopamine release has been demonstrated from the dorsal unpaired median neurone to the locust extensor-tibiae muscle (DUMETi) in response to high-[K+] saline. Here, we provide evidence for the existence of presynaptic inhibitory autoreceptors for octopamine on the DUMETi terminals and report on their pharmacological profile ...
, Howell, , Evans
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