Endocannabinoids Could Modulate Various Mood Disorders

by Sudha Bhat on  July 28, 2015 at 4:19 PM Health In Focus   - G J E 4
If you experience constant ups and downs in your mood...on-off, on-off to the extent that you struggle to find the emotional balance to deal with circumstances of life, then you could be suffering from a neuropsychiatric condition known as mood disorder.
 Endocannabinoids Could Modulate Various Mood Disorders
Endocannabinoids Could Modulate Various Mood Disorders

Mood disorders disturb the rhythm of your body, the melody of your mind and the harmony of your soul, thus affecting your quality of life to a great extent. It is estimated that nearly 17.5% of the US population suffers from a mood disorder and as high as 30.7% of the population is at a significant risk of developing one in their lifetime.

Mental disorders and other depressive episodes have become inherent in our society and have the highest rate of prevalence and incidence of morbidity. Untreated cases could end up in suicides.

It is a known fact that the main cause of mood disorders is an imbalance of chemicals in the brain which primarily affect your mood. Irregularities in dopamine is known to lead to psychosis and schizophrenia whereas disruptions in noradrenaline and serotonin could lead to bipolar disorder and depression.

Currently, a plethora of techniques such as psychotherapy, cognitive behavioral therapy, electroconvulsive therapy are utilized to help restore brain chemistry and treat psychiatric symptoms. Anticonvulsant drugs, antipsychotic drugs, antidepressants are used to treat various manic episodes, but they all carry the risk of cognitive and somatic side effects which have to be closely monitored by a qualified health practitioner.

Hence there is a need to explore alternative neurochemical systems for treatment of mood disorders. Endogenous cannabinoid system (ECS) is one such system.

Endocannabinoids are substances that regulate the electrochemical transmission of numerous neurotransmitters like GABA (Gamma Amino Butyric Acid), glutamate, D-aspartate, acetylcholine, dopamine, norepinephrine, 5-hydroxytryptamine among others.

There are two main cannabinoid receptor proteins CB1 and CB2. Research has shown increase in CB1 density in the brain, particularly the dorsolateral prefrontal cortex of individuals who suffered from depression or those who committed suicide. Thus an increase in the activity in the dorsolateral prefrontal cortex could possibly promote pessimistic biases, which includes negative emotional memories and negative mood disturbances in people who are depressed. Hence a protective response would be the upregulation of CB1-mediated endocannabinoid signaling in the dorsolateral prefrontal cortex region.

The synthesis of endogenous cannabinoid ligands, namely, N-arachidonoylethanolamide (AEA; anandamide) and sn-2-arachidonoylglycerol (2-AG) are initiated by distinct signaling cascades, mainly in response to demand from their arachidonate precursor in membrane phospholipids.

In a study conducted in rats, it was seen that rats who were put under chronic unpredictable or mild stress (CUS), which involved daily administration of various stressors such as forced swim, cage rotations, social isolation, deprivation from water etc., exhibited an increased secretion of corticosteroids and pro-inflammatory chemo/cytokines, just as observed in depressed humans.

Chronic unpredictable stress reportedly also alters the physiology of various neural structures including the amygdala, prefrontal cortex, hippocampus, hypothalamus and ventral striatum, which brings about mood disorders.

Researchers observed that low doses of drugs which activate cannabinoid receptor protein-CB1 (agonists) exhibited antidepressant and anxiolytic effects, while high doses exhibited strong anxiogenic effects. In classic behavioral tests, scientists found that indirect enhancement of CB1- mediated signaling also demonstrate antidepressant and anxiolytic effects, thus exhibiting good potential for a new pharmacotherapy for mood disorders including depression.

Thus, it was seen that augmenting CB1-mediated endocannabinoid signaling in the brain is shown to modulate cognitive-affective circuits and rescue both affective and somatic symptoms of depression in rat models, making them a good candidate for treatment of mood disorders. However, this research is only in the pre-clinical stage and more clinical trials are required in the near future, especially in humans, to bring about new pharmacotherapies for anxiety, depression and other affective disorders.


Source: Medindia

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