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Arachidonic Acid Cascade – Inflammation & Therapy

The arachidonic acid cascade is a key biochemical signaling pathway that regulates inflammatory responses in the body and plays a central role in many diseases.

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Things worth knowing about "Arachidonic Acid Cascade"

The arachidonic acid cascade is a key biochemical signaling pathway that regulates inflammatory responses in the body and plays a central role in many diseases.

What Is the Arachidonic Acid Cascade?

The arachidonic acid cascade refers to a series of biochemical reactions triggered by the release of the polyunsaturated fatty acid arachidonic acid from cell membranes. It plays a central role in the initiation and regulation of inflammatory processes, pain, fever, and a range of other physiological and pathological events in the human body.

Arachidonic acid is an omega-6 fatty acid found primarily in animal-based foods and can also be synthesized in the body from linoleic acid. It is incorporated into the phospholipids of cell membranes and is released on demand by the enzyme phospholipase A2.

How the Cascade Works

When a trigger – such as tissue injury, infection, or mechanical stress – acts on a cell, phospholipase A2 is activated. This enzyme cleaves arachidonic acid from the membrane phospholipids. The released arachidonic acid is then metabolized through two main pathways:

Cyclooxygenase Pathway (COX Pathway)

Through the enzymes cyclooxygenase-1 (COX-1) and cyclooxygenase-2 (COX-2), arachidonic acid is converted into prostaglandins, thromboxanes, and prostacyclin. These signaling molecules mediate inflammation, influence blood clotting, regulate blood vessel tone, and contribute to pain perception. COX-1 is constitutively active and helps protect the gastric mucosa, while COX-2 is primarily induced during inflammatory states.

Lipoxygenase Pathway (LOX Pathway)

Enzymes of the lipoxygenase family convert arachidonic acid into leukotrienes. Leukotrienes are particularly important in allergic reactions and conditions such as bronchial asthma and allergic rhinitis. They promote the migration of immune cells into tissues and increase vascular permeability.

Relevance to Disease

An excessive or chronically activated arachidonic acid cascade is involved in the development and progression of many diseases:

Chronic inflammatory conditions such as rheumatoid arthritis, Crohn's disease, and psoriasis
Cardiovascular disease: thromboxanes influence platelet aggregation and can increase the risk of heart attack and stroke
Allergies and asthma: leukotrienes play a key role in bronchospasm and allergic reactions
Cancer: COX-2 is overexpressed in various tumor tissues and is associated with tumor progression
Neurodegenerative diseases: neuroinflammation is linked to activation of the arachidonic acid cascade

Therapeutic Approaches

Because the arachidonic acid cascade is a central mediator of inflammation, it represents an important target for many medications:

Nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen and diclofenac inhibit cyclooxygenase, thereby reducing prostaglandin production
Selective COX-2 inhibitors (coxibs) target COX-2 specifically and cause fewer gastrointestinal side effects than traditional NSAIDs
Glucocorticoids (corticosteroids) inhibit phospholipase A2 and thus suppress the entire cascade at an early stage
Leukotriene receptor antagonists such as montelukast are used in the treatment of asthma and allergic rhinitis
Acetylsalicylic acid (aspirin) irreversibly inhibits both COX-1 and COX-2 and is used at low doses to inhibit platelet aggregation

Diet and the Arachidonic Acid Cascade

The availability of arachidonic acid in the body is also influenced by dietary intake. A high consumption of omega-6 fatty acids – particularly from red meat, organ meats, and certain vegetable oils – can enhance the cascade. In contrast, omega-3 fatty acids (EPA and DHA from fatty fish or algae oil) compete with arachidonic acid for the same enzymes and may therefore exert anti-inflammatory effects. A balanced diet with a favorable omega-6 to omega-3 ratio is considered a useful nutritional strategy for modulating inflammatory processes.

References

Rang HP, Dale MM, Ritter JM et al. - Rang and Dale's Pharmacology. 9th edition. Elsevier, 2019.
Calder PC - Omega-3 fatty acids and inflammatory processes: from molecules to man. Biochemical Society Transactions, 2017; 45(5):1105-1115. PubMed PMID: 28900017.
Vane JR, Botting RM - Anti-inflammatory drugs and their mechanism of action. Inflammation Research, 1998; 47 Suppl 2:S78-S87. PubMed PMID: 9831328.

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