Abstract
CTK 01512–2 toxin is a recombinant peptide of the Phα1β version derived from the venom of the Phoneutria nigriventer spider. It acts as an N-type voltage-gated calcium channel (VGCC) blocker and shows a prolonged effect on preventing and reducing nociception. Herein, CTK 01512–2 was tested on two models of persistent pain, the chronic post-ischemia pain (CPIP) and the paclitaxel-induced peripheral neuropathy, to evaluate its systemic, intrathecal, and intracerebroventricular effects on mechanical hypersensitivity and thermal allodynia. Glial cell viability was also investigated using the MTT test. The results showed that CTK 01512–2 intrathecal and systemic treatments reduced the mechanical hypersensitivity induced by CPIP, mainly between 1–4 h after its administration. Additionally, intrathecal treatment reduced the CPIP-induced thermal allodynia. In its turn, the intracerebroventricular treatment showed mechanical antihyperalgesic and thermal antiallodynic effects in the paclitaxel-induced peripheral neuropathy. These data reinforce the therapeutic potential of CTK 01512–2 to treat persistent pain conditions and offer a perspective to use the systemic route. Moreover, CTK 01512–2 increased the glial cell viability in the MTT reduction assay, and it may indicate a new approach to managing chronic pain. The results found in this study help to pave new perspectives of pain relief treatments to patients affected by chronic pain.
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Data Availability
The datasets used and/or analyzed during the current study are available from the corresponding author upon reasonable request.
Abbreviations
- CRPS-I:
-
Complex regional pain syndrome-type I
- CPIP:
-
Chronic post-ischemia pain
- IR:
-
Ischemia and reperfusion
- TRP:
-
Transient receptor potential channel
- LAIF:
-
Laboratory of Autoimmunity and Immunopharmacology
- CEUA:
-
Committee on Ethics in the Use of Animals
- ANOVA:
-
Analysis of variance
- ARRIVE:
-
Animal Research: Reporting in vivo Experiments
- CNS:
-
Central nervous system
- IL:
-
Interleukin
- CONCEA:
-
Brazilian Council of Animal Experimentation
- g:
-
Grams
- h:
-
Hours
- i.p.:
-
Intraperitoneal
- kg:
-
Kilograms
- mg:
-
Milligrams
- min:
-
Minutes
- ml:
-
Milliliters
- PTX:
-
Paclitaxel
- PWT:
-
Paw withdrawal threshold
- SEM:
-
Standard error of mean
- mmol:
-
Millimolar
- UFSC:
-
Universidade Federal de Santa Catarina
- AUC:
-
Area under the curve
- μl:
-
Microliters
- LPS:
-
Lipopolysaccharide
- CGRP:
-
Calcitonin gene-related peptide
- MTT:
-
Methyl-thiazolyl diphenyl-tetrazolium bromide
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Acknowledgements
We thank the Fundação de Amparo à Pesquisa e Inovação do Estado de Santa Catarina (FAPESC), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Universidade Federal de Santa Catarina (UFSC), Programa de Pós-Graduação em Neurociências (PPGNEURO/UFSC), and Programa INCT-INOVAMED (grant 465430/2014-7), all from Brazil.
Funding
E.C.D.G. and P.M.A are Ph.D. student in the Neuroscience and Health Program, respectively, receiving grants from the CAPES/FAPESC. A.Q.S., M.V.G., and R.C.D. are recipients of a research productivity fellowship from the CNPq.
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Contributions
Study design and concept, and manuscript writing: JC, PMA, ECDG, LDB, AQS, RCD; experiment implementation and manuscript drafting: JC, PMA, ECDG, LDB, AQS, RCD; figure production: JC, PMA, RCD; data analysis: JC, LDB, AQS, RCD; experiment support: JC, ECDG, LDB, AQS, RCD; the manuscript draft was critically revised by JC, LDB, AQS, NRBR, MVG, RCD. All authors read and approved the final manuscript.
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The manuscript does not contain clinical studies or patient data. The Animal Ethics Committee approved all procedures in this study involving animals of the Universidade Federal de Santa Catarina (CEUA/UFSC, protocol number 3914220319). All of the experimental procedures were conducted according to the guidelines of CONCEA and CEUA/UFSC, based on the principles of the 3Rs (Replacement, Reduction, and Refinement).
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Cavalli, J., de Assis, P.M., Cristina Dalazen Gonçalves, E. et al. Systemic, Intrathecal, and Intracerebroventricular Antihyperalgesic Effects of the Calcium Channel Blocker CTK 01512–2 Toxin in Persistent Pain Models. Mol Neurobiol 59, 4436–4452 (2022). https://doi.org/10.1007/s12035-022-02864-w
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DOI: https://doi.org/10.1007/s12035-022-02864-w