TRPA1 activation mediates nociception behaviors in a mouse model of relapsing-remitting experimental autoimmune encephalomyelitis.

Publication date: Feb 08, 2020

Central neuropathic pain is the main symptom caused by spinal cord lesion in relapsing-remitting multiple sclerosis (RRMS), but its management is still not effective. The transient receptor potential ankyrin 1 (TRPA1) is a pain detecting ion channel involved in neuropathic pain development. Thus, the aim of our study was to evaluate the role of TRPA1 in central neuropathic nociception induced by relapsing-remitting experimental autoimmune encephalomyelitis (RR-EAE) mouse model. In this model, we observed the development of similar clinical conditions of RRMS in C57BL/6 female mice through RR-EAE using MOG antigen and Quil A adjuvant. At the thirty-fifth day post-induction, C57BL/6 female mice demonstrated alteration in the RR-EAE score without motor impairment, mechanical and cold allodynia. Also, significative changes in demyelinating (Mog and olig-1) and neuroinflammatory (Iba1, Gfap and Tnfa) markers were observed, but this model did not alter Trpa1 RNA expression levels in the spinal cord. The hydrogen peroxide and 4-hydroxynonenal levels (TRPA1 agonists) were increased in RR-EAE induced mice, as well as the NADPH oxidase activity. The intragastric treatment of RR-EAE induced mice with TRPA1 antagonists (HC-030031 and A-967079) and antioxidant (?-lipoic acid and apocynin) caused an antiallodynic effect. Moreover, the intrathecal administration of TRPA1 antisense oligonucleotide, HC-030031, ?-lipoic acid, and apocynin transiently attenuated mechanical and cold allodynia. Thus, TRPA1 plays a key role in the induction of neuropathic pain in this model of RR-EAE and can be a possible target for investigating the development of pain in RRMS patients.

Dalenogare, D.P., Theisen, M.C., Peres, D.S., Fialho, M.F.P., L”uckemeyer, D.D., de David Antoniazzi, C.T., Kudsi, S.Q., de Amorim Ferreira, M., Dos Santos Ritter, C., Ferreira, J., Oliveira, S.M., and Trevisan, G. TRPA1 activation mediates nociception behaviors in a mouse model of relapsing-remitting experimental autoimmune encephalomyelitis. 20186. 2020 Exp Neurol.

Concepts Keywords
Adjuvant Pain
Allodynia Branches of biology
Ankyrin Ion channels
Antiallodynic Pain
Antigen TRPA1
Antioxidant Experimental autoimmune encephalomyelitis
Antisense Oligonucleotide Neuropathic pain
Gfap Multiple sclerosis
Hydrogen Peroxide Apocynin
Intrathecal EAE
Ion Channel Myelin oligodendrocyte glycoprotein
Lesion
Lipoic Acid
Mice
MOG
Mog
Multiple Sclerosis
NADPH Oxidase
Neuropathic
Neuropathic Pain
Nociception
Pain
Quil
Spinal Cord
Symptom
Transient Receptor Potential
TRPA1
Trpa1

Semantics

Type Source Name
disease MESH experimental autoimmune encephalomyelitis
disease MESH neuropathic pain
disease MESH relapsing-remitting multiple sclerosis
disease MESH development
disease MESH allodynia
drug DRUGBANK Hydrogen peroxide
drug DRUGBANK Lipoic Acid
drug DRUGBANK Apocynin
disease MESH Oxidative stress

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