Novel function of histamine in atherosclerotic artery

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The relation of histamine signaling in the arterial wall and atherogenesis was investigated using apoE-H1R-KO, apoE-H2R-KO and apoE-HDC-KO mice. The mice were fed by high cholesterol diet (1.25% cholesterol, 15% lard and 0.5% cholic acid) for 12 weeks, and pathological examination and expression of inflammation-related genes were evaluated in the aortas. Even the high cholesterol diet induced much higher hypercholesterolemia in apoE-H2R-KO and apoE-HDC-KO mice, the atherosclerotic lesion formation and expression of many inflammation-related genes were reduced in these KO mice than in apoE-KO mice. The histamine signaling mediated through H2 receptor would play a pivotal role in atherogenesis by regulating the inflammatory response in the vascular wall.