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Home NEWS Science News Health

Serotonin linked to somatic awareness, a condition long thought to be imaginary

Bioengineer by Bioengineer
June 19, 2019
in Health
0

New research suggests serotonin could be involved in a condition where patients experience physical discomforts for which there is no physiological explanation

An international team spearheaded by researchers at McGill University has discovered a biological mechanism that could explain heightened somatic awareness, a condition where patients experience physical discomforts for which there is no physiological explanation.

Patients with heightened somatic awareness often experience unexplained symptoms – headaches, sore joints, nausea, constipation or itchy skin – that cause emotional distress, and are twice as likely to develop chronic pain. The condition is associated with illnesses such as fibromyalgia, rheumatoid arthritis and temporomandibular disorders, and is thought to be of psychological origin.

“Think of the fairy tale of the princess and the pea,” says Samar Khoury, a postdoctoral fellow at McGill’s Alan Edwards Centre for Research on Pain. “The princess in the story had extreme sensitivity where she could feel a small pea through a pile of 20 mattresses. This is a good analogy of how someone with heightened somatic awareness might feel; they have discomforts caused by a tiny pea that doctors can’t seem to find or see, but it’s very real.”

Thanks to an existing study on genetic association, Samar Khoury and her colleagues might have found the elusive pea capable of explaining somatic awareness.

Their work, recently published in the Annals of Neurology, used data available through the Orofacial Pain: Prospective Evaluation and Risk Assessment cohort and demonstrates that patients who suffer from somatic symptoms share a common genetic variant. The mutation leads to the malfunctioning of an enzyme critical for the production of serotonin, a neurotransmitter with numerous biological functions.

“I am very happy and proud that our work provides a molecular basis for heightened somatic symptoms,” says Luda Diatchenko, lead author of the new study and a professor in McGill’s Faculty of Dentistry. “We believe that this work is very important to patients because we can now provide a biological explanation of their symptoms. It was often believed that there were psychological or psychiatric problems, that the problem was in that patient’s head, but our work shows that these patients have lower levels of serotonin in their blood.”

The results of their study have laid the groundwork for the development of animal models that could be used to better characterize the molecular pathways in heightened somatic awareness. Above all, Diatchenko and Khoury hope their work will pave the way for treatment options.

“The next step for us would be to see if we are able to target serotonin levels in order to alleviate these symptoms,” says Diatchenko, who holds the Canada Excellence Research Chair in Human Pain Genetics.

###

This work was supported by the Canadian Institutes of Health Research, Natural Sciences and Engineering Research Council of Canada, the National Institutes of Health and the National Institute of Dental and Craniofacial Research.

“A functional substitution in the L-aromatic amino acid decarboxylase enzyme worsens somatic symptoms via a serotonergic pathway,” by Samar Khoury et al. was published in the Annals of Neurology.

Contacts:

Cynthia Lee

McGill Media Relations Office

514-398-6754

[email protected]

Media Contact
Cynthia Lee
[email protected]

Related Journal Article

https://mcgill.ca/newsroom/channels/news/serotonin-linked-somatic-awareness-condition-long-thought-be-imaginary-297893
http://dx.doi.org/10.1002/ana.25521

Tags: Medicine/HealthPainPhysiologyPublic Health

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