Biomaterial Database

Pharmacological evidence for the existence of presynaptic alpha-like receptors in Mytilus muscle. 1983

M Matsuura, and M Kamura, and Y Muneoka

The effects of alpha-adrenoceptor agonists and antagonists on contractions of the ABRM of M. edulis were examined. Naphazoline (10(-11)-10(-7)M) as well as octopamine potentiated both contractions in response to ACh and to repetitive electrical stimulation with brief pulses, while clonidine (10(-12)-10(-6)M), imidazole (10(-4)-10(-3)M) and tolazoline (10(-6)-10(-4)M) potentiated only the contraction in response to repetitive electrical stimulation. Potentiating actions of octopamine and naphazoline on ACh contraction were blocked by tolazoline but were little affected by clonidine and imidazole. Potentiating after-effect of repetitive electrical stimulation on subsequent ACh-contraction was not affected by clonidine and imidazole but was blocked by tolazoline. These results suggest that in the ABRM there are probably at least two classes of alpha-like receptors for octopamine; one may be on the muscle fibres and the other may be on the excitatory nerve terminals. Activation of the latter class of receptors may result in enhancement of ACh release from the terminals.

UI	MeSH Term	Description	Entries
D009119	Muscle Contraction	A process leading to shortening and/or development of tension in muscle tissue. Muscle contraction occurs by a sliding filament mechanism whereby actin filaments slide inward among the myosin filaments.	Inotropism,Muscular Contraction,Contraction, Muscle,Contraction, Muscular,Contractions, Muscle,Contractions, Muscular,Inotropisms,Muscle Contractions,Muscular Contractions
D009132	Muscles	Contractile tissue that produces movement in animals.	Muscle Tissue,Muscle,Muscle Tissues,Tissue, Muscle,Tissues, Muscle
D009278	Naphazoline	An adrenergic vasoconstrictor agent used as a decongestant.	AK-Con,Afazol Grin,Albalon,All Clear,Clear Eyes,Colirio Alfa,Idril,Miraclar,Nafazair,Naphazoline Hydrochloride,Naphazoline Monohydrochloride,Naphazoline Nitrate,Naphcon,Naphcon Forte,Optazine,Privin,Privine,Proculin,Siozwo,Tele-Stulln,VasoNit,Vasoclear,Vasocon,Vasocon Regular,Vasoconstrictor Pensa,AK Con,Hydrochloride, Naphazoline,Monohydrochloride, Naphazoline,Nitrate, Naphazoline,Pensa, Vasoconstrictor,Tele Stulln
D009655	Octopamine	An alpha-adrenergic sympathomimetic amine, biosynthesized from tyramine in the CNS and platelets and also in invertebrate nervous systems. It is used to treat hypotension and as a cardiotonic. The natural D(-) form is more potent than the L(+) form in producing cardiovascular adrenergic responses. It is also a neurotransmitter in some invertebrates.	Norsynephrine,p-Octopamine,para-Octopamine,4-Octopamine,Norsympatol,alpha-(Aminoethyl)-4-hydroxybenzenemethanol
D004558	Electric Stimulation	Use of electric potential or currents to elicit biological responses.	Stimulation, Electric,Electrical Stimulation,Electric Stimulations,Electrical Stimulations,Stimulation, Electrical,Stimulations, Electric,Stimulations, Electrical
D000316	Adrenergic alpha-Agonists	Drugs that selectively bind to and activate alpha adrenergic receptors.	Adrenergic alpha-Receptor Agonists,alpha-Adrenergic Receptor Agonists,Adrenergic alpha-Agonist,Adrenergic alpha-Receptor Agonist,Receptor Agonists, Adrenergic alpha,Receptor Agonists, alpha-Adrenergic,alpha-Adrenergic Agonist,alpha-Adrenergic Agonists,alpha-Adrenergic Receptor Agonist,Adrenergic alpha Agonist,Adrenergic alpha Agonists,Adrenergic alpha Receptor Agonist,Adrenergic alpha Receptor Agonists,Agonist, Adrenergic alpha-Receptor,Agonist, alpha-Adrenergic,Agonist, alpha-Adrenergic Receptor,Agonists, Adrenergic alpha-Receptor,Agonists, alpha-Adrenergic,Agonists, alpha-Adrenergic Receptor,Receptor Agonist, alpha-Adrenergic,Receptor Agonists, alpha Adrenergic,alpha Adrenergic Agonist,alpha Adrenergic Agonists,alpha Adrenergic Receptor Agonist,alpha Adrenergic Receptor Agonists,alpha-Agonist, Adrenergic,alpha-Agonists, Adrenergic,alpha-Receptor Agonist, Adrenergic,alpha-Receptor Agonists, Adrenergic
D000317	Adrenergic alpha-Antagonists	Drugs that bind to but do not activate alpha-adrenergic receptors thereby blocking the actions of endogenous or exogenous adrenergic agonists. Adrenergic alpha-antagonists are used in the treatment of hypertension, vasospasm, peripheral vascular disease, shock, and pheochromocytoma.	Adrenergic alpha-Receptor Blockaders,alpha-Adrenergic Blocking Agents,alpha-Adrenergic Receptor Blockaders,alpha-Blockers, Adrenergic,Adrenergic alpha-Blockers,alpha-Adrenergic Antagonists,alpha-Adrenergic Blockers,Adrenergic alpha Antagonists,Adrenergic alpha Blockers,Adrenergic alpha Receptor Blockaders,Agents, alpha-Adrenergic Blocking,Antagonists, alpha-Adrenergic,Blockaders, Adrenergic alpha-Receptor,Blockaders, alpha-Adrenergic Receptor,Blockers, alpha-Adrenergic,Blocking Agents, alpha-Adrenergic,Receptor Blockaders, alpha-Adrenergic,alpha Adrenergic Antagonists,alpha Adrenergic Blockers,alpha Adrenergic Blocking Agents,alpha Adrenergic Receptor Blockaders,alpha Blockers, Adrenergic,alpha-Antagonists, Adrenergic,alpha-Receptor Blockaders, Adrenergic
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D049872	Bivalvia	A class in the phylum MOLLUSCA comprised of mussels; clams; OYSTERS; COCKLES; and SCALLOPS. They are characterized by a bilaterally symmetrical hinged shell and a muscular foot used for burrowing and anchoring.	Mussels,Bivalves,Clams,Bivalve,Bivalvias,Clam,Mussel