NDLI: Platelet-activating factor acetylhydrolase activity in maternal, fetal, and newborn rabbit plasma during pregnancy and lactation.

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Platelet-activating factor acetylhydrolase activity in maternal, fetal, and newborn rabbit plasma during pregnancy and lactation.

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Platelet-activating factor acetylhydrolase activity in maternal, fetal, and newborn rabbit plasma during pregnancy and lactation.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Hoffman, D. R. Maki, N. Johnston, J. M.
Description	Author Affiliation: Maki N ( Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas 75235.);
Abstract	The inactivation of the biologically active ether-containing glycerophospholipid platelet-activating factor (PAF) is catalyzed by the enzyme PAF acetylhydrolase (1-alkyl-2-acetyl-sn-glycero-3-phosphocholine acetylhydrolase, EC 3.1.1.48). The specific activity of acetylhydrolase has been assayed in maternal rabbit plasma prior to and throughout pregnancy and after parturition. The specific activity of acetylhydrolase was 131 +/- 8 nmol.min-1.ml-1 of plasma (mean +/- SEM) in the nonpregnant rabbit. Similar specific activities were found throughout the first half of pregnancy; however, on day 15 the acetylhydrolase activity began to decrease and reached a minimum around day 27. Within 24-48 hr following delivery, the specific activity of the enzyme increased to the levels found in the nonpregnant animals. The specific activity of acetylhydrolase in fetuses (gestational ages of 21-30 days) and neonates increased from 22 nmol.min-1.ml-1 of plasma (21-day-old) to 328 nmol.min-1.ml-1 of plasma (35-day-old rabbits). The decrease in enzymatic activity of the pregnant rabbit plasma cannot be accounted for by the presence of an inhibitor as determined by plasma-mixing experiments with nonpregnant and pregnant (27-day) plasma. The properties of this enzyme in the rabbit were consistent with those reported by others, i.e., substrate specificity, inactivation by heat and various inhibitors, and Ca2+ independency. The activity of PAF acetylhydrolase was associated primarily with the high density lipoprotein fraction in rabbit plasma. The decrease of this enzymatic activity during pregnancy may serve to remove the protective effect on myometrium to allow an increased amount of PAF to come in contact with this tissue.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	3
Volume Number	85
Language	English
Publisher	National Academy of Sciences
Publisher Date	1988-03-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Fetal Blood Enzymology Lactation Phospholipases A Blood Phospholipases Pregnancy, Animal 1-Alkyl-2-acetylglycerophosphocholine Esterase Animals Animals, Newborn Pregnancy Rabbits Embryology Comparative Study Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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