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An upregulation of the endogenous opioid, dynorphin A, in the spinal cord is seen in multiple experimental models of chronic pain. Recent findings implicate a direct excitatory action of dynorphin A at bradykinin receptors to promote hyperalgesia in nerve injured rats, and its upregulation may promote, rather than counteract, enhanced nociceptive input due to injury. Here we examined a model of inflammatory...
The endogenous opioid peptide dynorphin A is distinct from other endogenous opioid peptides in having significant neuronal excitatory and neurotoxic effects that are not mediated by opioid receptors. Some of these non-opioid actions of dynorphin contribute to the development of abnormal pain resulting from a number of pathological conditions. Identifying the mechanisms and the sites of action of dynorphin...
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