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Synthesis and Significance of Arachidonic Acid, a Substrate for Cyclooxygenases, Lipoxygenases, and Cytochrome P450
Jan Korbecki1, Ewa Rębacz-Maron2, Patrycja Kupnicka1
1Department of Biochemistry and Medical Chemistry, Pomeranian Medical University in Szczecin, Powstańców Wlkp. 72, 70-111 Szczecin, Poland.
Abstract:
Glioblastoma multiforme (GBM) is one of the most aggressive gliomas. New and more effective therapeutic approaches are being sought based on studies of the various mechanisms of GBM tumorigenesis, including the synthesis and metabolism of arachidonic acid (ARA), an omega-6 polyunsaturated fatty acid (PUFA). PubMed, GEPIA, and the transcriptomics analysis carried out by Seifert et al. were used in writing this paper. In this paper, we discuss in detail the biosynthesis of this acid in GBM tumors, with a special focus on certain enzymes: fatty acid desaturase (FADS)1, FADS2, and elongation of long-chain fatty acids family member 5 (ELOVL5). We also discuss ARA metabolism, particularly its release from cell membrane phospholipids by phospholipase A2 (cPLA2, iPLA2, and sPLA2) and its processing by cyclooxygenases (COX-1 and COX-2), lipoxygenases (5-LOX, 12-LOX, 15-LOX-1, and 15-LOX-2), and cytochrome P450. Next, we discuss the significance of lipid mediators synthesized from ARA in GBM cancer processes, including prostaglandins (PGE2, PGD2, and 15-deoxy-Δ12,14-PGJ2 (15d-PGJ2)), thromboxane A2 (TxA2), oxo-eicosatetraenoic acids, leukotrienes (LTB4, LTC4, LTD4, and LTE4), lipoxins, and many others. These lipid mediators can increase the proliferation of GBM cancer cells, cause angiogenesis, inhibit the anti-tumor response of the immune system, and be responsible for resistance to treatment.
Insights
Arachidonic acid (ARA) metabolism is crucial in glioblastoma multiforme (GBM) development. Targeting enzymes and lipid mediators involved in ARA pathways may offer new glioblastoma treatment strategies.
Area of Science:
- Neuro-oncology
- Cancer Biology
- Molecular Biology
Background:
- Glioblastoma multiforme (GBM) is an aggressive brain tumor with limited treatment options.
- Understanding GBM tumorigenesis mechanisms is vital for developing novel therapies.
- Arachidonic acid (ARA), an omega-6 polyunsaturated fatty acid (PUFA), plays a role in cancer development.
Purpose of the Study:
- To detail the biosynthesis and metabolism of ARA in GBM.
- To highlight key enzymes and pathways involved in ARA processing.
- To explore the role of ARA-derived lipid mediators in GBM progression and treatment resistance.
Main Methods:
- Literature review using PubMed.
- Analysis of GEPIA and transcriptomics data (Seifert et al.).
- Detailed discussion of enzymes like FADS1, FADS2, ELOVL5, phospholipases A2, cyclooxygenases, lipoxygenases, and cytochrome P450.
Main Results:
- Specific enzymes (FADS1, FADS2, ELOVL5) are involved in ARA biosynthesis in GBM.
- ARA is metabolized via various pathways, including phospholipase A2, COX, LOX, and CYP450.
- ARA-derived lipid mediators (prostaglandins, leukotrienes, etc.) promote GBM cell proliferation, angiogenesis, and immune evasion.
Conclusions:
- ARA metabolism is significantly altered in GBM.
- Lipid mediators derived from ARA contribute to GBM aggressiveness and treatment resistance.
- Targeting ARA pathways presents a promising therapeutic strategy for glioblastoma.
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