title: alpha-Adrenergic blocking action of 1-O-hexadecyl-2-O-acetyl-sn-glycero-3-phosphocholine in rats.
abstract: The effect of 1-O-hexadecyl-2-O-acetyl-sn-glycero-3-phosphocholine (HAGPC), a major component of antihypertensive polar renomedullary lipid, on the pressor responses to norepinephrine and angiotensin II was investigated in normal Wistar rats. The pressor activity of norepinephrine (1 microgram/kg of body weight (BW)) and angiotensin II (40 ng/kg BW) were markedly suppressed when these substances were injected immediately after intravenous administration of 80 nmol/kg BW of HAGPC. When HAGPC was infused continuously at a rate of 20 nmol/kg BW/min, pressor responses to bolus injection of graded doses (0.5 to 10 micrograms/kg BW) of norepinephrine were significantly lowered, but pressor responses to 10 to 200 ng/kg BW of angiotensin II were not affected. These observations suggest that HAGPC has alpha-adrenergic blocking activity and does not influence angiotensin II receptors.
mesh_terms: D000317:Adrenergic alpha-Antagonists; D000804:Angiotensin II / Q000494:pharmacology; D000818:Animals; D000959:Antihypertensive Agents; D001794:Blood Pressure / Q000187:drug effects; D008297:Male; D008353:Mannitol / Q000378:metabolism; D009638:Norepinephrine / Q000378:metabolism; D010972:Platelet Activating Factor / Q000031:analogs & derivatives* / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D000317:Adrenergic alpha-Antagonists; D000959:Antihypertensive Agents; D010972:Platelet Activating Factor; D000804:Angiotensin II; D008353:Mannitol; C037145:1-hexadecyl-2-acetyl-glycero-3-phosphocholine; D009638:Norepinephrine