Brain oxylipin concentrations following hypercapnia/ ischemia: Effects of brain dissection and dissection time

Marie Hennebelle, Adam H. Metherel, Alex P. Kitson, Yurika Otoki, Jun Yang, Kin Sing Stephen Lee, Bruce D. Hammock, Richard P. Bazinet, Ameer Y. Taha

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

PUFAs are precursors to bioactive oxylipin metabolites that increase in the brain following CO2-induced hypercapnia/ischemia. It is not known whether the brain-dissection process and its duration also alter these metabolites. We applied CO2 with or without head-focused microwave fixation for 2 min to evaluate the effects of CO2-induced asphyxiation, dissection, and dissection time on brain oxylipin concentrations. Compared with head-focused microwave fixation (control), CO2 followed by microwave fixation prior to dissection increased oxylipins derived from lipoxygenase (LOX), 15-hydroxyprostaglandin dehydrogenase (PGDH), cytochrome P450 (CYP), and soluble epoxide hydrolase (sEH) enzymatic pathways. This effect was enhanced when the duration of postmortem ischemia was prolonged by 6.4 min prior to microwave fixation. Brains dissected from rats subjected to CO2 without microwave fixation showed greater increases in LOX, PGDH, CYP and sEH metabolites compared with all other groups, as well as increased cyclooxygenase metabolites. In nonmicrowave-irradiated brains, sEH metabolites and one CYP metabolite correlated positively and negatively with dissection time, respectively. This study presents new evidence that the dissection process and its duration increase brain oxylipin concentrations, and that this is preventable by microwave fixation. When microwave fixation is not available, lipidomic studies should account for dissection time to reduce these artifacts.

Original languageEnglish
Pages (from-to)671-682
Number of pages12
JournalJournal of lipid research
Volume60
Issue number3
DOIs
Publication statusPublished - 2019

Keywords

  • Brain lipids
  • Lipid mediators
  • Polyunsaturated fatty acid metabolites

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology
  • Cell Biology

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