Pre- and Posttranslational Regulation of Β-Endorphin Biosynthesis in the CNS: Effects of Chronic Naltrexone Treatment
dc.contributor.author | Bronstein, David M. | en_US |
dc.contributor.author | Day, Nicola C. | en_US |
dc.contributor.author | Gutstein, Howard B. | en_US |
dc.contributor.author | Trujillo, Keith A. | en_US |
dc.contributor.author | Akil, Huda | en_US |
dc.date.accessioned | 2010-04-01T15:08:16Z | |
dc.date.available | 2010-04-01T15:08:16Z | |
dc.date.issued | 1993-01 | en_US |
dc.identifier.citation | Bronstein, David M.; Day, Nicola C.; Gutstein, Howard B.; Trujillo, Keith A.; Akil, Huda (1993). "Pre- and Posttranslational Regulation of Β-Endorphin Biosynthesis in the CNS: Effects of Chronic Naltrexone Treatment." Journal of Neurochemistry 60(1): 40-49. <http://hdl.handle.net/2027.42/65603> | en_US |
dc.identifier.issn | 0022-3042 | en_US |
dc.identifier.issn | 1471-4159 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/65603 | |
dc.identifier.uri | http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=retrieve&db=pubmed&list_uids=8417165&dopt=citation | en_US |
dc.description.abstract | There appear to be two anatomically distinct Β-endorphin (ΒE) pathways in the brain, the major one originating in the arcuate nucleus of the hypothalamus and a smaller one in the area of the nucleus tractus solitarius (NTS) of the caudal medulla. Previous studies have shown that these two proopiomelanocortin (POMC) systems may be differentially regulated by chronic morphine treatment, with arcuate cells down-regulated and NTS cells unaffected. In the present experiments, we examined the effects of chronic opiate antagonist treatment on ΒE biosynthesis across different CNS regions to assess whether the arcuate POMC system would be regulated in the opposite direction to that seen after opiate agonist treatment and to determine whether different ΒE-containing areas might be differentially regulated. Male adult rats were administered naltrexone (NTX) by various routes for 8 days (subcutaneous pellets, osmotic minipumps, or repeated intraperitoneal injections). Brain and spinal cord regions were assayed for total ΒE-ir, different molecular weight immunoreactive Β-endorphin (ΒE-ir) peptides, and POMC mRNA. Chronic NTX treatment, regardless of the route of administration, reduced total ΒE-ir concentrations by 30–40% in diencephalic areas (the arcuate nucleus, the remaining hypothalamus, and the thalamus) and the midbrain, but had no effect on ΒE-ir in the NTS or any region of the spinal cord. At the same time, NTX pelleting increased POMC mRNA levels in the arcuate to ∼ 140% of control values. These data suggest that arcuate POMC neurons are up-regulated after chronic NTX treatment (whereas NTS and spinal cord systems remain unaffected) and that they appear to be under tonic inhibition by endogenous opioids. Chromatographic analyses demonstrated that, after chronic NTX pelleting, the ratio of full length ΒE 1–31 to more processed ΒE-ir peptides (i.e., ΒE 1–27 and ΒE 1–26 ) tended to increase in a dose-dependent manner in diencephalic areas. Because ΒE 1–31 is the only POMC product that possesses opioid agonist properties, and ΒE 1–27 has been posited to function as an endogenous anatgonist of ΒE 1–31 , the NTX-induced changes in the relative concentrations of ΒE 1–31 and ΒE 1–27 /ΒE 1–26 may represent a novel regulatory mechanism of POMC cells to alter the opioid signal in the synapse. | en_US |
dc.format.extent | 1222532 bytes | |
dc.format.extent | 3110 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.publisher | Blackwell Publishing Ltd | en_US |
dc.rights | 1993 International Society for Neurochemistry | en_US |
dc.subject.other | Opioids | en_US |
dc.subject.other | Opiate Antagonist | en_US |
dc.subject.other | Proopiomelanocortin | en_US |
dc.subject.other | Β-Endorphin Processing | en_US |
dc.subject.other | Proopiomelanocortin MRNA | en_US |
dc.subject.other | Endogenous Opioids | en_US |
dc.title | Pre- and Posttranslational Regulation of Β-Endorphin Biosynthesis in the CNS: Effects of Chronic Naltrexone Treatment | en_US |
dc.type | Article | en_US |
dc.rights.robots | IndexNoFollow | en_US |
dc.subject.hlbsecondlevel | Neurosciences | en_US |
dc.subject.hlbtoplevel | Health Sciences | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Mental Health Research Institute, Ann Arbor, Michigan, U.S.A. | en_US |
dc.contributor.affiliationum | * Department of Anesthesiology, University of Michigan, Ann Arbor, Michigan, U.S.A. | en_US |
dc.identifier.pmid | 8417165 | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/65603/1/j.1471-4159.1993.tb05820.x.pdf | |
dc.identifier.doi | 10.1111/j.1471-4159.1993.tb05820.x | en_US |
dc.identifier.source | Journal of Neurochemistry | en_US |
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dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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