Where are the mu receptors that mediate opioid analgesia? An autoradiographic study in the HAR and LAR selection lines

John Belknap, S. E. Laursen, K. E. Sampson, A. Wilkie

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

One line (strain) of mouse has been selectively bred in our laboratory for 15 generations to exhibit a very high sensitivity to levorphanol-induced analgesia on the hot plate assay (HAR or high antinociceptive response line). Concurrently, a second line (LAR or low antinociceptive response line) has been bred in the opposite direction, i.e., to exhibit a very low sensitivity under the same conditions. This has resulted in a 7-fold difference in sensitivity between HAR and LAR mice as a result of changes in gene frequency. Receptor autoradiographic studies with 3H-DAGO were carried out in the central gray to find receptor populations differing greatly in density between HAR and LAR mice to parallel their in vivo sensitivity differences: such receptors would then be implicated in mediating in vivo analgesia. The caudal portions of the dorsal raphe nucleus (DRN) showed 1.5- to 2-fold differences in density of mu sites, while the periaqueductal gray (PAG) showed relatively small differences. These results strongly suggest that mu receptors in a portion of the DRN are involved in mediating analgesia due to systemically administered opioids in this population of mice.

Original languageEnglish (US)
Title of host publicationBehavioral and Biochemical Issues in Substance Abuse
PublisherTaylor and Francis
Pages29-44
Number of pages16
ISBN (Electronic)9781315825403
ISBN (Print)9781560240884
DOIs
StatePublished - Jun 3 2014

Fingerprint

mu Opioid Receptor
Analgesia
Levorphanol
Ala(2)-MePhe(4)-Gly(5)-enkephalin
Periaqueductal Gray
Gene Frequency
Opioid Analgesics
Population
Dorsal Raphe Nucleus

ASJC Scopus subject areas

  • Medicine(all)
  • Psychology(all)
  • Social Sciences(all)

Cite this

Belknap, J., Laursen, S. E., Sampson, K. E., & Wilkie, A. (2014). Where are the mu receptors that mediate opioid analgesia? An autoradiographic study in the HAR and LAR selection lines. In Behavioral and Biochemical Issues in Substance Abuse (pp. 29-44). Taylor and Francis. https://doi.org/10.4324/9781315825403

Where are the mu receptors that mediate opioid analgesia? An autoradiographic study in the HAR and LAR selection lines. / Belknap, John; Laursen, S. E.; Sampson, K. E.; Wilkie, A.

Behavioral and Biochemical Issues in Substance Abuse. Taylor and Francis, 2014. p. 29-44.

Research output: Chapter in Book/Report/Conference proceedingChapter

Belknap, J, Laursen, SE, Sampson, KE & Wilkie, A 2014, Where are the mu receptors that mediate opioid analgesia? An autoradiographic study in the HAR and LAR selection lines. in Behavioral and Biochemical Issues in Substance Abuse. Taylor and Francis, pp. 29-44. https://doi.org/10.4324/9781315825403
Belknap J, Laursen SE, Sampson KE, Wilkie A. Where are the mu receptors that mediate opioid analgesia? An autoradiographic study in the HAR and LAR selection lines. In Behavioral and Biochemical Issues in Substance Abuse. Taylor and Francis. 2014. p. 29-44 https://doi.org/10.4324/9781315825403
Belknap, John ; Laursen, S. E. ; Sampson, K. E. ; Wilkie, A. / Where are the mu receptors that mediate opioid analgesia? An autoradiographic study in the HAR and LAR selection lines. Behavioral and Biochemical Issues in Substance Abuse. Taylor and Francis, 2014. pp. 29-44
@inbook{16bd9338e4cc49d2a9a487c84c76e221,
title = "Where are the mu receptors that mediate opioid analgesia? An autoradiographic study in the HAR and LAR selection lines",
abstract = "One line (strain) of mouse has been selectively bred in our laboratory for 15 generations to exhibit a very high sensitivity to levorphanol-induced analgesia on the hot plate assay (HAR or high antinociceptive response line). Concurrently, a second line (LAR or low antinociceptive response line) has been bred in the opposite direction, i.e., to exhibit a very low sensitivity under the same conditions. This has resulted in a 7-fold difference in sensitivity between HAR and LAR mice as a result of changes in gene frequency. Receptor autoradiographic studies with 3H-DAGO were carried out in the central gray to find receptor populations differing greatly in density between HAR and LAR mice to parallel their in vivo sensitivity differences: such receptors would then be implicated in mediating in vivo analgesia. The caudal portions of the dorsal raphe nucleus (DRN) showed 1.5- to 2-fold differences in density of mu sites, while the periaqueductal gray (PAG) showed relatively small differences. These results strongly suggest that mu receptors in a portion of the DRN are involved in mediating analgesia due to systemically administered opioids in this population of mice.",
author = "John Belknap and Laursen, {S. E.} and Sampson, {K. E.} and A. Wilkie",
year = "2014",
month = "6",
day = "3",
doi = "10.4324/9781315825403",
language = "English (US)",
isbn = "9781560240884",
pages = "29--44",
booktitle = "Behavioral and Biochemical Issues in Substance Abuse",
publisher = "Taylor and Francis",

}

TY - CHAP

T1 - Where are the mu receptors that mediate opioid analgesia? An autoradiographic study in the HAR and LAR selection lines

AU - Belknap, John

AU - Laursen, S. E.

AU - Sampson, K. E.

AU - Wilkie, A.

PY - 2014/6/3

Y1 - 2014/6/3

N2 - One line (strain) of mouse has been selectively bred in our laboratory for 15 generations to exhibit a very high sensitivity to levorphanol-induced analgesia on the hot plate assay (HAR or high antinociceptive response line). Concurrently, a second line (LAR or low antinociceptive response line) has been bred in the opposite direction, i.e., to exhibit a very low sensitivity under the same conditions. This has resulted in a 7-fold difference in sensitivity between HAR and LAR mice as a result of changes in gene frequency. Receptor autoradiographic studies with 3H-DAGO were carried out in the central gray to find receptor populations differing greatly in density between HAR and LAR mice to parallel their in vivo sensitivity differences: such receptors would then be implicated in mediating in vivo analgesia. The caudal portions of the dorsal raphe nucleus (DRN) showed 1.5- to 2-fold differences in density of mu sites, while the periaqueductal gray (PAG) showed relatively small differences. These results strongly suggest that mu receptors in a portion of the DRN are involved in mediating analgesia due to systemically administered opioids in this population of mice.

AB - One line (strain) of mouse has been selectively bred in our laboratory for 15 generations to exhibit a very high sensitivity to levorphanol-induced analgesia on the hot plate assay (HAR or high antinociceptive response line). Concurrently, a second line (LAR or low antinociceptive response line) has been bred in the opposite direction, i.e., to exhibit a very low sensitivity under the same conditions. This has resulted in a 7-fold difference in sensitivity between HAR and LAR mice as a result of changes in gene frequency. Receptor autoradiographic studies with 3H-DAGO were carried out in the central gray to find receptor populations differing greatly in density between HAR and LAR mice to parallel their in vivo sensitivity differences: such receptors would then be implicated in mediating in vivo analgesia. The caudal portions of the dorsal raphe nucleus (DRN) showed 1.5- to 2-fold differences in density of mu sites, while the periaqueductal gray (PAG) showed relatively small differences. These results strongly suggest that mu receptors in a portion of the DRN are involved in mediating analgesia due to systemically administered opioids in this population of mice.

UR - http://www.scopus.com/inward/record.url?scp=85065588353&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85065588353&partnerID=8YFLogxK

U2 - 10.4324/9781315825403

DO - 10.4324/9781315825403

M3 - Chapter

SN - 9781560240884

SP - 29

EP - 44

BT - Behavioral and Biochemical Issues in Substance Abuse

PB - Taylor and Francis

ER -