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Adenylyl cyclase type 5 (AC5) is an essential mediator of morphine action.

Abstract
Opioid drugs produce their pharmacological effects by activating inhibitory guanine nucleotide-binding regulatory protein-linked mu, delta, and kappa opioid receptors. One major effector for these receptors is adenylyl cyclase, which is inhibited upon receptor activation. However, little is known about which of the ten known forms of adenylyl cyclase are involved in mediating opioid actions. Here we show that all of the major behavioral effects of morphine, including locomotor activation, analgesia, tolerance, reward, and physical dependence and withdrawal symptoms, are attenuated in mice lacking adenylyl cyclase type 5 (AC5), a form of adenylyl cyclase that is highly enriched in striatum. Furthermore, the behavioral effects of selective mu or delta opioid receptor agonists are lost in AC5-/- mice, whereas the behavioral effects of selective kappa opioid receptor agonists are unaffected. These behavioral data are consistent with the observation that the ability of a mu or delta opioid receptor agonist to suppress adenylyl cyclase activity was absent in striatum of AC5-/- mice. Together, these results establish AC5 as an important component of mu and delta opioid receptor signal transduction mechanisms in vivo and provide further support for the importance of the cAMP pathway as a critical mediator of opioid action.
AuthorsKyoung-Shim Kim, Ko-Woon Lee, Kang-Woo Lee, Joo-Young Im, Ji Yeoun Yoo, Seung-Woo Kim, Ja-Kyeong Lee, Eric J Nestler, Pyung-Lim Han
JournalProceedings of the National Academy of Sciences of the United States of America (Proc Natl Acad Sci U S A) Vol. 103 Issue 10 Pg. 3908-13 (Mar 07 2006) ISSN: 0027-8424 [Print] United States
PMID16537460 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Isoenzymes
  • Receptors, Opioid
  • Receptors, Opioid, delta
  • Receptors, Opioid, mu
  • Morphine
  • Adenylyl Cyclases
  • adenylyl cyclase type V
Topics
  • Adenylyl Cyclases (deficiency, genetics, metabolism)
  • Animals
  • Behavior, Animal (drug effects, physiology)
  • Conditioning, Psychological (drug effects)
  • Corpus Striatum (drug effects, enzymology)
  • Isoenzymes (deficiency, genetics, metabolism)
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Morphine (pharmacology)
  • Motor Activity (drug effects)
  • Pain Measurement
  • Receptors, Opioid (agonists, drug effects, physiology)
  • Receptors, Opioid, delta (drug effects, physiology)
  • Receptors, Opioid, mu (drug effects, physiology)
  • Signal Transduction
  • Substance Withdrawal Syndrome

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