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Antinociceptive action of botulinum toxin type A in carrageenan-induced mirror pain

  • Neurology and Preclinical Neurological Studies - Original Article
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Abstract

“Mirror pain” or mirror-image pain (MP) is pain opposite to the side of injury. Mechanism and frequency in humans are not known. There is no consent on therapy. Here we report that unilaterally injected botulinum toxin type A (BT-A) has bilateral effect in experimental MP, thus deserves to be investigated as therapy for this condition. We examined the localization of BT-A’s bilateral antinociceptive action in MP induced by 3 % carrageenan intramuscular injection in Wistar rats. BT-A was applied peripherally (5 U/kg), into ipsilateral or contralateral hind paw pad (i.pl.) and centrally (1 U/kg), at spinal (intrathecally, i.t.) or supraspinal (intracisternally, i.c.) level. Additionally, we examined the involvement of central opioid and GABAergic systems, as well as the contribution of peripheral capsaicin-sensitive neurons to BT-A’s bilateral antinociceptive effect. Ipsilateral i.pl. and i.t. BT-A reduced the bilateral mechanical sensitivity to von Frey filaments, while contralateral i.pl. and i.c. treatments had no effect on either tested side. Bilateral antinociceptive effect of ipsilateral i.pl. BT-A was prevented by μ-opioid antagonist naloxonazine (1.5 μg/10 μl) and GABAA antagonist bicuculline (1 μg/10 μl) if applied at the spinal level, in contrast to supraspinal application of the same doses. Local treatment of sciatic nerve with 2 % capsaicin 5 days following BT-A i.pl. injection caused desensitization of sciatic capsaicin-sensitive fibers, but did not affect bilateral antinociceptive effect of BT-A and the presence of cleaved SNAP-25 at the spinal cord slices. Present experiments suggest segmental actions of peripheral BT-A at spinal level, which are probably not solely dependent on capsaicin-sensitive neurons.

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Abbreviations

BT-A:

Botulinum toxin type A

B:

Bicuculline

N:

Naloxonazine

SNAP-25:

Synaptosomal Associated Protein of 25 kDa

clSNAP-25:

Cleaved SNAP-25

MP:

Mirror pain

ASIC3:

Acid-sensing ion channel 3

CGRP:

Calcitonin gene-related polypeptide

SP:

Substance P

GABA:

γ-aminobutyric acid

TRPV1:

Transient receptor potential vanilloid type 1

CFA:

Complete Freund’s adjuvant

IoNC:

Infraorbital nerve constriction

CSF:

Cerebrospinal fluid

DRG:

Dorsal root ganglion

RVM:

Rostral ventromedial medulla

TNC:

Trigeminal nucleus caudalis

TENS:

Transcutaneous electric nerve stimulation

i.m.:

Intramuscular

i.pl.:

Intraplantar

i.t.:

Intrathecal

i.c.:

Intracisternal

i.c.v.:

Intracerebroventricular

PBS:

Phosphate-buffered saline

PBST:

Triton X-100 in phosphate buffered saline

NGS:

Normal goat serum

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Acknowledgments

We thank Božica Hržan for excellent technical assistance and Ivica Matak for help in performing capsaicin experiment and advices in SNAP-25 immunohistochemistry. This work was supported by Croatian Science Foundation (IP-2014-09-4503), University of Zagreb financial support (Project BM005) and Croatian Ministry of Science, Education and Sports (Project No. 101-1010003- 0001).

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Correspondence to L. Bach-Rojecky.

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We declare no conflict of interest.

Ethical approval

All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. Experiments were approved by the Ethical Committee of the University of Zagreb School of Medicine (permit No. 07-76/2005-43).

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Drinovac Vlah, V., Bach-Rojecky, L. & Lacković, Z. Antinociceptive action of botulinum toxin type A in carrageenan-induced mirror pain. J Neural Transm 123, 1403–1413 (2016). https://doi.org/10.1007/s00702-016-1605-7

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  • DOI: https://doi.org/10.1007/s00702-016-1605-7

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