BACKGROUND: Neuropathic pain should be treated with drug combinations exhibiting multiple analgesic mechanisms of action because the mechanism of neuropathic pain involves multiple physiological causes and is mediated by multiple pathways. In this study, we defined the pharmacological interaction of BRL52537 ([kappa]-opioid agonist), pregabalin (calcium channel modulator), AF 353 (P2X3 receptor antagonist), and A804598 (P2X7 receptor antagonist). METHODS: Animal models of neuropathic pain were established by spinal nerve ligation (SNL) in male Sprague-Dawley rats, and responses to the mechanical stimulation using von Frey filaments were measured. Drugs were administered by intrathecal route and were examined for antiallodynic effects, and drug interactions were evaluated using isobolographic analysis. The mRNA expression levels of pain-related receptors in each spinal cord or dorsal root ganglion of naive, SNL, and drug-treated SNL rats were evaluated using real-time polymerase chain reaction. RESULTS: Intrathecal BRL52537, pregabalin, AF 353, and A804598 produced antiallodynic effects in SNL rats. In the drug combination studies, intrathecal coadministration of BRL52537 with pregabalin or A804598 exhibited synergistic interactions, and other drugs combinations showed additivity. The rank order of potency was observed as follows: BRL52537 + pregabalin > BRL52537 + A804598 > pregabalin + AF 353 > A804598 + pregabalin > BRL52537 + AF 353 > AF 353 + A804598. Real-time polymerase chain reaction indicated that alterations of P2X3 receptor and calcium channel mRNA expression levels were observed, while P2X7 receptor and [kappa]-opioid receptor expression levels were not altered. CONCLUSIONS: These results demonstrated that intrathecal combination of BRL52537, pregabalin, AF 353, and A804598 synergistically or additively attenuated allodynia evoked by SNL, which suggests the possibility to improve the efficacy of single-drug administration. (C) 2017 International Anesthesia Research Society
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Σφακιανάκης Αλέξανδρος
ΩτοΡινοΛαρυγγολόγος
Αναπαύσεως 5 Άγιος Νικόλαος
Κρήτη 72100
00302841026182
00306932607174
alsfakia@gmail.com
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- Response to Tulchinsky and Avram re: “Long-Term Ou...
- Response to Tulchinsky and Avram re: “Long-Term Ou...
- Vaccine Development
- Cell membrane integrity and revascularization: The...
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- Organogelation of self-assembling segmented poly(u...
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- Hemichorea secondary to non-ketotic hyperglycemia ...
- Persistent trigeminal artery trunk giant aneurysm ...
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- The 'reverse' evaluation!
- Description of coma and coma arousal therapy in Ca...
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- Role of functional MRI in identifying network chan...
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- A novel silver nanocluster in situ synthesized as ...
- Enhanced photocurrent production by the synergy of...
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- Can gene editing and silencing technologies play a...
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