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Recent Advances in Endomorphin Engineering
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DOI：10.1002/cmdc.201000077.png)
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Recent statistics from the World Health Organization indicate that a high percentage of people worldwide suffer from a wide variety of acute or cancer-associated chronic pain. At present, with a few exceptions, the treatment of severe pain relies upon oral administration of the mu-opioid receptor-targeting opiate morphine and its surrogates under strict clinical control. In spite of the powerful in vivo efficacy of these drugs, their long-term use is limited by antinociceptive tolerance, physical dependence, and respiratory depression that evolve. As no analgesics with moderate side effect profiles are currently available for the therapy of different types of pain and stages of cancer, considerable efforts must be made in the search for opiate substitutes. Following the recognition that endogenous peptide ligands of the opioid receptors exert striking effects in various pain models, and with the recent advances in chemical synthesis methods, research interest has steadily moved toward peptide-based compounds as potential opioid analgesics. The endomorphins are an attractive set of endogenous opioid peptides that may meet the requirements of opioid-based pain management. By virtue of their excellent mu-opioid receptor labeling and favorable analgesic properties, these tetrapeptides have gained attention in recent years as potential lead compounds. The ever-increasing number of publications in this field strongly suggests that modified analogues of endomorphins could serve as potent substitutes for opiates, with a lower propensity to induce side effects. This review surveys the main results achieved over the past decade regarding the design, radiolabeling, pharmacological characterization, and structure-activity features of a large body of endomorphin derivatives.
Keyword:
endomorphins
opioids
radiolabeling
stability
structure-activity relationships
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