Endocannabinoid system and essential fatty acids

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The endocannabinoid system (ECS) is a complex biological mechanism that plays a fundamental role in maintaining the body’s homeostasis. It regulates key processes such as energy metabolism, immune response, mood regulation, and pain perception.

Its ligands are endocannabinoids, lipid-derived molecules, which are responsible for:

Maintenance of bodily homeostasis
Regulation of energy metabolism
Response to oxidative stress
Immune response
Modulation of inflammatory states

These physiological responses depend on the ability of the ECS to receive and process signals in proportion to the stimuli received; excessive chronic stimulation undermines bodily homeostasis and induces the production of reactive oxygen species (ROS) as a result of oxidative stress.

Among endocannabinoids are metabolites of polyunsaturated fatty acids (PUFAs), derived from the precursors alpha-linolenic acid (ALA) and linoleic acid (LA), which give rise to the two families of Omega-3 and Omega-6. ALA and LA are essential for cellular life and for maintaining membrane integrity, and must necessarily be obtained through the diet.

Starting from arachidonic acid, an intermediate in the Omega-6 synthesis pathway, lipid molecules such as anandamide and 2-arachidonoylglycerol are generated, which bind to the endocannabinoid receptor. The Omega-3 family also produces other endocannabinoids, as well as anti-inflammatory metabolites, including certain series-3 prostaglandins and series-5 leukotrienes. Furthermore, from both Omega classes, enzymatic reactions give rise to pro-resolving lipid mediators capable of counteracting inflammatory states and restoring homeostasis. These mediators can improve metabolism and immune function.

CB1 AND CB2 RECEPTORS

Central CB1 receptors, once activated, are responsible for regulating anxiety states, emotional well-being, appetite, and energy metabolism. However, increased CB1 activity is also associated with a higher metabolic risk.

Peripheral CB2 receptors are involved in the control of neuropathic pain. They undergo upregulation in response to pro-inflammatory stimuli and are closely linked to stress, inflammatory states, and tissue-protective activity. In particular, targeted action on CB2 leads to a reduction in inflammatory cytokines and regulation of inflammatory cell migration, without the psychoactive effects exerted by CB1 ligands.

PUFAs AND OXIDATIVE STRESS

It has been demonstrated that certain endogenous endocannabinoids, including anandamide, are capable of counteracting oxidative stress in PC12 cells by acting on neurotoxicity and inflammation.

Endocannabinoid receptors have also shown affinity for dietary components; therefore, the ECS can be modulated through appropriate supplementation. Among these, PUFAs are essential for the synthesis of endocannabinoids: both Omega families contribute to maintaining bodily balance through the modulation of signals directed to these receptors. This process plays an important role in counteracting metabolic and immune disorders associated with inflammatory states and oxidative stress.