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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Anwar-Mohamed, Anwar Elshenawy, Osama H. El-Sherbeni, Ahmed A. Abdelrady, Mohamed El-Kadi, Ayman O. S. |
| Description | Country affiliation: Canada Author Affiliation: Anwar-Mohamed A ( Faculty of Pharmacy and Pharmaceutical Sciences, 2142J Katz Group-Rexall Centre for Pharmacy and Health Research, University of Alberta, Edmonton, AB T6G 2E1, Canada.) |
| Abstract | The toxic effects of arsenic on the whole brain, as well as the discrete regions, has been previously reported for mice. We investigated the effects of acute arsenite (As(III)) on brain levels of arachidonic acid (AA) and its associated metabolites generated through cytochrome P450 (CYP), cyclooxygenase (COX), and lipoxygenase (LOX) pathways. Our results demonstrated that acute As(III) treatment (12.5 mg·(kg body mass)(-1)) decreases cytosolic phospholipase A2 (cPLA2) with a subsequent decrease in its catalytic activity and brain AA levels. In addition, As(III) differentially altered CYP epoxygenases and CYP ω-hydroxylases, but it did not affect brain Ephx2 mRNA or sEH catalytic activity levels. As(III)-mediated effects on Cyps caused an increase in brain 5,6-epoxyeicosatrienoic acid (5,6-EET) and 16/17-hydroxyeicosatetreinoic acid (16/17-HETE) levels, and a decrease in 18- and 20-HETE levels. Furthermore, As(III) increased cyclooxygenase-2 (COX-2) mRNA while decreasing prostaglandins F2 (PGF2 ) and PGJ2. As(III) also increased brain 5-lipoxygenase (5-LOX) and 15-LOX mRNA, but decreased 12-LOX mRNA. These changes in LOX mRNA were associated with a decrease in 8/12-HETE levels only. In conclusion, this is the first demonstration that As(III) decreases AA levels coinciding with alterations to EET, HETE, and PG levels, which affects brain development and neurochemistry. |
| File Format | HTM / HTML |
| ISSN | 00084212 |
| e-ISSN | 12057541 |
| Journal | Canadian Journal of Physiology and Pharmacology |
| Issue Number | 8 |
| Volume Number | 92 |
| Language | English |
| Publisher | Canadian Science Publishing |
| Publisher Date | 2014-08-01 |
| Publisher Place | Canada |
| Access Restriction | Open |
| Subject Keyword | Discipline Physiology Discipline Pharmacology Arachidonic Acid Metabolism Arsenites Toxicity Brain Drug Effects Environmental Pollutants Sodium Compounds Animals Cytochrome P-450 Enzyme System Eicosanoids Epoxide Hydrolases Lipoxygenases Mice, Inbred C57bl Prostaglandin-endoperoxide Synthases Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physiology Physiology (medical) Pharmacology |
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