title: Production of lysophosphatidic acid by lysophospholipase D in incubated plasma of spontaneously hypertensive rats and Wistar Kyoto rats.
abstract: Lysophosphatidic acid has been identified as a vasopressor principle in incubated mammalian plasma and sera, and shown to be generated extracellulary by lysophospholipase D-like activity. In this study, we monitored the time course of changes in the major phospholipid fractions during incubation of plasma, and found that polyunsaturated lysophosphatidic acids accumulate more rapidly than saturated lysophosphatidic acids at expense of the corresponding lysophosphatidylcholines. We compared the phospholipase activities for producing bioactive LPA in age-matched spontaneously hypertensive rats and Wistar Kyoto rats. The lysophospholipase D activity in rat plasma was found to be independent of strain and age. We suggest that lysophospholipase D functions in rat for persistent production of bioactive LPA in the circulation throughout life. However, our finding that production of LPA in spontaneously hypertensive rats was not greater than that in Wistar Kyoto rats does not seem to support the idea that increased production of LPA is involved in the pathogenesis of hypertension.
authors.affiliation: Faculty of Pharmaceutical Sciences, The University of Tokushima, Japan. tokumura@ph.tokushima-u.ac.jp
authors.forename: A
authors.initials: A
authors.lastname: Tokumura
authors.forename: H
authors.initials: H
authors.lastname: Fujimoto
authors.forename: O
authors.initials: O
authors.lastname: Yoshimoto
authors.forename: Y
authors.initials: Y
authors.lastname: Nishioka
authors.forename: M
authors.initials: M
authors.lastname: Miyake
authors.forename: K
authors.initials: K
authors.lastname: Fukuzawa
mesh_terms: D000375:Aging / Q000378:metabolism; D000818:Animals; D002849:Chromatography, Gas; D002855:Chromatography, Thin Layer; D005227:Fatty Acids / Q000032:analysis; D066298:In Vitro Techniques; D008246:Lysophospholipids / Q000096:biosynthesis* / Q000097:blood / Q000737:chemistry; D008297:Male; D010713:Phosphatidylcholines / Q000097:blood; D010727:Phosphoric Diester Hydrolases / Q000097:blood / Q000378:metabolism*; D051381:Rats; D011918:Rats, Inbred SHR; D011921:Rats, Inbred WKY; D013045:Species Specificity; D013997:Time Factors; D000099189:Lysophospholipase D
chemical_list: D005227:Fatty Acids; D008246:Lysophospholipids; D010713:Phosphatidylcholines; D010727:Phosphoric Diester Hydrolases; D000099189:Lysophospholipase D