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Mar. Drugs 2013, 11(3), 680-699; doi:10.3390/md11030680

Omega-Conotoxins as Experimental Tools and Therapeutics in Pain Management

Department of Pharmacology & Toxicology, Michigan State University, East Lansing, MI 48824, USA
* Author to whom correspondence should be addressed.
Received: 21 December 2012 / Revised: 14 February 2013 / Accepted: 15 February 2013 / Published: 7 March 2013
(This article belongs to the Special Issue Marine Neurotoxins)
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Neuropathic pain afflicts a large percentage of the global population. This form of chronic, intractable pain arises when the peripheral or central nervous systems are damaged, either directly by lesion or indirectly through disease. The comorbidity of neuropathic pain with other diseases, including diabetes, cancer, and AIDS, contributes to a complex pathogenesis and symptom profile. Because most patients present with neuropathic pain refractory to current first-line therapeutics, pharmaceuticals with greater efficacy in pain management are highly desired. In this review we discuss the growing application of ω-conotoxins, small peptides isolated from Conus species, in the management of neuropathic pain. These toxins are synthesized by predatory cone snails as a component of paralytic venoms. The potency and selectivity with which ω-conotoxins inhibit their molecular targets, voltage-gated Ca2+ channels, is advantageous in the treatment of neuropathic pain states, in which Ca2+ channel activity is characteristically aberrant. Although ω-conotoxins demonstrate analgesic efficacy in animal models of neuropathic pain and in human clinical trials, there remains a critical need to improve the convenience of peptide drug delivery methods, and reduce the number and severity of adverse effects associated with ω-conotoxin-based therapies.
Keywords: neuropathic pain; voltage-gated calcium channel; omega-conotoxin; ziconotide neuropathic pain; voltage-gated calcium channel; omega-conotoxin; ziconotide
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Hannon, H.E.; Atchison, W.D. Omega-Conotoxins as Experimental Tools and Therapeutics in Pain Management. Mar. Drugs 2013, 11, 680-699.

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