Arachidonic acid metabolism by bovine placental tissue during the last month of pregnancy

Journal Article · Tue Jan 01 00:00:00 EST 1991 · Prostaglandins; (USA)

DOI:https://doi.org/10.1016/0090-6980(91)90107-Q· OSTI ID:5768657

Hoedemaker, M; Weston, P G; Wagner, W C ^[1]

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1. Univ. of Illinois, Urbana (USA)

Conversion of tritiated arachidonic acid (AA) into metabolites of the cyclo- and lipoxygenase pathways by bovine fetal placental tissue (200 mg) and fetal plus maternal placental tissue (400 mg) of Days 255, 265, 275 of gestation and at parturition (n = 5) during a 30 min incubation was measured using reverse-phase high pressure liquid chromatography. Fetal placental tissue produced 13,14-dihydro-15-keto-prostaglandin E2 (PGEM) as the major metabolite, the synthesis of which increased from Day 265 to Day 275 and parturition by 150% and 475%, respectively. In tissues collected at parturition, PGE2 synthesis was also detected. On Day 275 and at parturition fetal placental tissue synthesized the metabolite 12-hydroxyheptadecatrienoic acid (HHT), and throughout the experimental period the lipoxygenase product 15-HETE was detected with synthesis rates increasing over time of gestation. In addition, an unidentified metabolite was regularly found in the radiochromatograms which eluted at 1 h and 1 min (U101), between HHT and 15-HETE. The synthesis of this metabolite decreased as pregnancy progressed. Furthermore, various other polar and nonpolar metabolites pooled under the heading UNID were eluted, the production of which increased over time of gestation. The presence of maternal placental tissue did not influence the synthesis of PGEM, 15-HETE and U101, but the production of HHT was decreased when maternal tissue was present. Also, as pregnancy progressed, maternal placental tissue seemed to contribute to the pool of unidentified metabolites. In conclusion, fetal placental tissue seems to be the major source of the AA metabolites when compared with maternal placental tissue, and AA metabolism by bovine placental tissue is markedly increased throughout the last month of pregnancy, suggesting a role for AA metabolites in mechanisms controlling parturition.

• OSTI ID: 5768657
• Journal Information: Prostaglandins; (USA), Vol. 41:1; ISSN 0090-6980
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
ARACHIDONIC ACID
METABOLISM
BIOLOGICAL PATHWAYS
CATTLE
LIQUID COLUMN CHROMATOGRAPHY
METABOLITES
OXYGENASES
PLACENTA
PREGNANCY
TRACER TECHNIQUES
TRITIUM COMPOUNDS
ANIMALS
CARBOXYLIC ACIDS
CHROMATOGRAPHY
DOMESTIC ANIMALS
ENZYMES
FETAL MEMBRANES
HYDROGEN COMPOUNDS
ISOTOPE APPLICATIONS
MAMMALS
MEMBRANES
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDOREDUCTASES
RUMINANTS
SEPARATION PROCESSES
VERTEBRATES
550501* - Metabolism- Tracer Techniques