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Related Experiment Videos

Putative cyclooxygenase-3 expression in rat brain cells.

Bela Kis1, James A Snipes, Toyohi Isse

  • 1Department of Physiology and Pharmacology, Wake Forest University, School of Medicine, Winston-Salem, NC 27157, USA. bkis@wfubmc.edu

Journal of Cerebral Blood Flow and Metabolism : Official Journal of the International Society of Cerebral Blood Flow and Metabolism
|November 6, 2003
PubMed
Summary
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Researchers identified cyclooxygenase-3 (COX-3) mRNA in various rat brain cells, excluding neurons. COX-3 is constitutively expressed and not stimulated by lipopolysaccharide (LPS), differing from COX-2.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • Cyclooxygenase-3 (COX-3), an acetaminophen-sensitive isoform, was recently identified in canine tissues.
  • Canine COX-3 shares similarities with COX-1 but retains intron 1 in its mRNA, with high expression in the brain.

Purpose of the Study:

  • To investigate the expression of putative rat COX-3 mRNA in primary cultures of various rat brain cell types.
  • To determine if COX-3 expression is modulated by lipopolysaccharide (LPS) challenge.

Main Methods:

  • Primary cultures of rat neurons, astrocytes, endothelial cells, pericytes, and choroidal epithelial cells were established.
  • Specific RT-PCR primers were designed to detect putative rat COX-3 mRNA.
  • RT-PCR products were sequenced and compared to rat COX-1 sequences.

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Main Results:

  • Putative COX-3 mRNA was detected in all tested rat brain cell types except neurons.
  • Cerebral endothelial cells exhibited the highest COX-3 expression.
  • COX-1 and COX-3 expression remained unchanged after LPS challenge, unlike COX-2.

Conclusions:

  • This study provides the first evidence of detectable putative COX-3 mRNA in rats.
  • COX-3 mRNA is differentially expressed across various rat brain cell types.
  • COX-3 expression appears to be constitutive and not induced by LPS.