Biomaterial Database

Calcium mobilization and its desensitization induced by endothelins and sarafotoxin in human astrocytoma cells (1321N1): comparison of histamine-induced calcium mobilization. 1992

K Yanai, and K Maeyama, and N Nakahata, and H Nakanishi, and T Watanabe

Department of Pharmacology I, Tohoku University School of Medicine, Sendai, Japan.

Intracellular free Ca2+ concentration ([Ca2+]i) was monitored in monolayer of 1321 N1 astrocytoma cells by using a fluorescent Ca2+ indicator fura-2. Endothelin-1 (ET-1), endothelin-2 (ET-2), and sarafotoxin Sb6 (SRTX) increased [Ca2+]i from 56 +/- 6 nM to 360 +/- 82, 120 +/- 51, 143 +/- 29 nM, respectively, immediately after their addition to the perfusate with maximum response of more than 0.1 microM of peptides. Endothelin-3 (less than 1 microM) did not affect [Ca2+]i. The increase in [Ca2+]i in response to either ET-1, ET-2, or SRTX could be almost completely inhibited by pretreating cells with ET-1 or ET-2. The homologous desensitization of [Ca2+]i induced by ETs and SRTX is in good agreement with their affinity toward an ETA receptors. The responses in [Ca2+]i by ETs and SRTX were not affected in the desensitized state induced by the pretreatment of histamine in the presence of extracellular Ca2+. However, the response in [Ca2+]i by ETs and SRTX were reduced in the desensitized state induced by pretreatment of histamine in the absence of extracellular Ca2+. These results indicate that depletion of the intracellular Ca2+ stores is responsible for the heterologous desensitization between ETs and histamine.

UI	MeSH Term	Description	Entries
D007457	Iodine Radioisotopes	Unstable isotopes of iodine that decay or disintegrate emitting radiation. I atoms with atomic weights 117-139, except I 127, are radioactive iodine isotopes.	Radioisotopes, Iodine
D002118	Calcium	A basic element found in nearly all tissues. It is a member of the alkaline earth family of metals with the atomic symbol Ca, atomic number 20, and atomic weight 40. Calcium is the most abundant mineral in the body and combines with phosphorus to form calcium phosphate in the bones and teeth. It is essential for the normal functioning of nerves and muscles and plays a role in blood coagulation (as factor IV) and in many enzymatic processes.	Coagulation Factor IV,Factor IV,Blood Coagulation Factor IV,Calcium-40,Calcium 40,Factor IV, Coagulation
D002217	Carbachol	A slowly hydrolyzed CHOLINERGIC AGONIST that acts at both MUSCARINIC RECEPTORS and NICOTINIC RECEPTORS.	Carbamylcholine,Carbacholine,Carbamann,Carbamoylcholine,Carbastat,Carbocholine,Carboptic,Doryl,Isopto Carbachol,Jestryl,Miostat,Carbachol, Isopto
D004305	Dose-Response Relationship, Drug	The relationship between the dose of an administered drug and the response of the organism to the drug.	Dose Response Relationship, Drug,Dose-Response Relationships, Drug,Drug Dose-Response Relationship,Drug Dose-Response Relationships,Relationship, Drug Dose-Response,Relationships, Drug Dose-Response
D006632	Histamine	An amine derived by enzymatic decarboxylation of HISTIDINE. It is a powerful stimulant of gastric secretion, a constrictor of bronchial smooth muscle, a vasodilator, and also a centrally acting neurotransmitter.	Ceplene,Histamine Dihydrochloride,Histamine Hydrochloride,Peremin
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D014407	Tumor Cells, Cultured	Cells grown in vitro from neoplastic tissue. If they can be established as a TUMOR CELL LINE, they can be propagated in cell culture indefinitely.	Cultured Tumor Cells,Neoplastic Cells, Cultured,Cultured Neoplastic Cells,Cell, Cultured Neoplastic,Cell, Cultured Tumor,Cells, Cultured Neoplastic,Cells, Cultured Tumor,Cultured Neoplastic Cell,Cultured Tumor Cell,Neoplastic Cell, Cultured,Tumor Cell, Cultured
D014757	Viper Venoms	Venoms from SNAKES of the viperid family. They tend to be less toxic than elapid or hydrophid venoms and act mainly on the vascular system, interfering with coagulation and capillary membrane integrity and are highly cytotoxic. They contain large amounts of several enzymes, other factors, and some toxins.	Russell Viper Venom,Russell Viper Venoms,Russell's Viper Venom,Russell's Viper Venoms,Viperidae Venoms,Cerastes Venom,Cerastes Venoms,Egyptian Sand Viper Venom,Viper Venom,Viperotoxin,Russells Viper Venom,Russells Viper Venoms,Venom, Cerastes,Venom, Russell Viper,Venom, Russell's Viper,Venom, Viper,Venoms, Cerastes,Venoms, Russell Viper,Venoms, Russell's Viper,Venoms, Viper,Venoms, Viperidae,Viper Venom, Russell,Viper Venom, Russell's,Viper Venoms, Russell,Viper Venoms, Russell's
D015544	Inositol 1,4,5-Trisphosphate	Intracellular messenger formed by the action of phospholipase C on phosphatidylinositol 4,5-bisphosphate, which is one of the phospholipids that make up the cell membrane. Inositol 1,4,5-trisphosphate is released into the cytoplasm where it releases calcium ions from internal stores within the cell's endoplasmic reticulum. These calcium ions stimulate the activity of B kinase or calmodulin.	1,4,5-InsP3,Inositol 1,4,5-Triphosphate,Myo-Inositol 1,4,5-Trisphosphate,1,4,5-IP3,Myoinositol 1,4,5-Triphosphate
D016232	Endothelins	21-Amino-acid peptides produced by vascular endothelial cells and functioning as potent vasoconstrictors. The endothelin family consists of three members, ENDOTHELIN-1; ENDOTHELIN-2; and ENDOTHELIN-3. All three peptides contain 21 amino acids, but vary in amino acid composition. The three peptides produce vasoconstrictor and pressor responses in various parts of the body. However, the quantitative profiles of the pharmacological activities are considerably different among the three isopeptides.	Endothelium-Derived Vasoconstrictor Factors,Endothelin,Vasoconstrictor Factors, Endothelium-Derived