Histamine, Free Base

A potent vasodilator found in normal tissues and blood. Activates nitric oxide synthase.

A potent vasodilator found in normal tissues and blood. Activates nitric oxide synthase. Formed by the decarboxylation of L-histidine. Activation of histamine H₁ receptors leads to Ca²⁺ mobilization, whereas histamine H₂ receptor activation stimulates adenylate cyclase activity in neurons. Stimulated time- and concentration-dependent increase in p38 and p42/p44 MAP kinases in DDT(1) MF2 cells.

A potent vasodilator found in normal tissues and blood. Formed by the decarboxylation of L-histidine. Activates nitric oxide synthase (NOS), resulting in the release of nitric oxide. Activation of histamine H₁ receptors leads to Ca²⁺ mobilization; whereas, histamine H₂ receptor activation stimulates adenylate cyclase activity in neurons. Inhibits the synthesis of IL-2 and γ-IFN in peripheral blood mononuclear cells and lipopolysaccharide-induced synthesis of TNF-α in monocytes via H₂ receptor activation.

Packaged under inert gas

Toxicity: Harmful (C)

Following reconstitution, aliquot and freeze (-20°C). Stock solutions are stable for up to 3 months at -20°C.

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Bloom, F.E. 1990. in Pharmacological Basis of Therapeutics p. 224 (Gilman, A.G., et al., Eds.) Pergamon Press, New York.

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