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نویسندگان

  • Kazutaka Ikeda
  • Shinya Kasai
چکیده

The μ-opioid receptor (MOP) is a subtype that belongs to the superfamily of 7-transmembranespanning G-protein-coupled receptors. Pharmacological studies with gene-knockout mice show that MOP is a major target for the clinically important opioid drugs, such as morphine and fentanyl, and it appears to play critical roles in the mediation of the major effects of these opioid drugs, including analgesia, tolerance, dependence and respiratory depression [1,2,201] . Homozygous MOP-deficient mice are insensitive to morphine [3-5] . In addition, heterozygous MOP-deficient mice, which possess approximately half of the amount of MOP protein in wild-type mice, exhibit haploinsufficiency in the analgesic effects of morphine [4,5] . The CXBK mouse strain, a recombinant inbred strain derived from an F2 intercross between BALB/c and C57BL/6 mice, exhibit reduced responses to opioid receptor agonists [6] . The CXBK strain expresses approximately half of the amount of MOP mRNA compared with progenitor strains and display phenotypes similar to those of heterozygous MOP-deficient mice [7] . In the CXBK strain, an intracisternal A-particle transposon is inserted in the 3 ́-UTR of the MOP gene, which would be expected to be the cause of the reduced response to opioids [8] . Among wild-derived inbred mouse strains, many genetic variations were identified in the mouse MOP gene, and some of these variations were associated with interstrain differences in opioid sensitivity [9] . These results suggest that genetic variations in the MOP gene and MOP expression influence morphine sensitivity in a gene dosage-dependent manner.

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تاریخ انتشار 2013