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New treatment of psoriasis-Epidural nerve block with lidocaine

Written By : Dr. Kamal Kant Kohli Published On 2022-08-16T20:00:39+05:30  |  Updated On 11 Oct 2023 4:51 PM IST
New treatment of psoriasis-Epidural nerve block with lidocaine
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Psoriasis is a chronic inflammatory, debilitating skin disorder for which there is apparently no cure. Several treatment options have been tried that can inhibit inflammation and relieve signs and symptoms of this disease.

Epidural nerve block with lidocaine may be new treatment of psoriasis, according to a new study. Investigators have reported surprising results for treating psoriasis using epidural lidocaine injections.

The study has been published in the Journal of Investigative Dermatology.

"Case studies have shown that psoriasis patients have experienced significant symptom relief after receiving epidural anesthesia during surgery, suggesting a pivotal role of the nervous system in psoriasis pathogenesis," explained lead investigator Honglin Wang, PhD, Shanghai Institute of Immunology, Precision Research Center for Refractory Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.

"Additionally, there is increasing evidence linking the neuroimmune connection to psoriasis and other skin diseases. These factors inspired us to explore the possibility of directly targeting the nervous system for psoriasis treatment and the detailed mechanism of neuroimmune crosstalk in psoriasis."

Investigators conducted a proof-of-concept study using an epidural injection of lidocaine to treat four patients with psoriasis. An epidural catheter was inserted between T12 (i.e., the 12th thoracic vertebra) and L1 (i.e., the first lumbar vertebra) of the spinal cord. Lidocaine solution was injected through the catheter. Each patient received three or four treatments in total. Two patients had psoriatic lesions throughout the whole body; two patients had psoriatic lesions mainly distributed on the legs.

By the end of the study period, all patients achieved remarkable improvements in almost all lesions, showing a 35%-70% reduction in Psoriasis Area and Severity Index (PASI) scores. Furthermore, skin improvements were maintained for at least 24 weeks after discontinuation of lidocaine treatment. No adverse effects occurred. This research provides the first clinical evidence that sensory nerves are potential targets for psoriasis treatment.

To evaluate the neuroimmune communication signaling in psoriasis and the mechanism for lidocaine therapy, investigators also conducted a number of experiments on rats in which a psoriasis-like skin inflammation had been induced. They found that lidocaine acts on sensory neurons by downregulating disordered neurite growth and proinflammatory CGRP (calcium gene-related peptide) release. Concomitantly, restricted CGRP+ nerve density leads to reduced IL-23 production from dendritic cells, which express excessive CGRP receptors.

In summary, this proof-of-concept pilot study highlights the potential for epidural lidocaine injection as an effective and safe therapeutic strategy for psoriasis treatment and expands understanding of the role of the peripheral nerve system in psoriasis and possibly other skin diseases.

Manipulating the neuroimmune interplay puts a brake on neurogenic inflammation and downstream key inflammatory cytokine production, providing therapeutic prospects for sensory neuron‒orchestrated inflammatory skin diseases.

"Epidural lidocaine therapy provides a novel choice for patients who respond poorly to the current treatment modalities for psoriasis," added lead author Qianqian Yin, PhD, Shanghai Institute of Immunology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.

"Although these findings are promising, this was a small pilot study that lacks a placebo-controlled arm and controls to prevent interference by environmental changes. We next need to conduct large-scale clinical studies," commented co-investigator Libo Sun, PhD, Shanghai Institute of Immunology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.

Psoriasis affects more than 3% of the US adult population. It is a chronic immune-mediated skin disorder with the peripheral sensory nervous system taking an active part in its pathogenesis. The most common type of psoriasis is plaque psoriasis. Symptoms are patches of skin that are dry, red and covered in silver scales that usually appear on the elbows, knees, lower back and scalp.

There is no cure for psoriasis, but a range of systemic and topical treatments can relieve symptoms and signs and improve the appearance of skin patches.

Reference:

Lidocaine Ameliorates Psoriasis by Obstructing Pathogenic CGRP Signaling‒Mediated Sensory Neuron‒Dendritic Cell Communication Qianqian Yin, Libo Sun, Xiaojie Cai, Buwei Yu, Qifang Li, Honglin Wang, Published: January 12, 2022 DOI: https://doi.org/10.1016/j.jid.2022.01.002

psoriaticskinlesionsskin disorderinflammatory disorderdrug therapypsoriasis treatmentlidocaineJournal of Investigative Dermatology
Source : Journal of Investigative Dermatology
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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