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Text
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<a href="http://doi.org/10.1016/s0165-5728(03)00213-3" target="_blank" rel="noreferrer">http://doi.org/10.1016/s0165-5728(03)00213-3</a>
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Title
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Different mechanisms of intrinsic pain inhibition in early and late inflammation
Publisher
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Journal Of Neuroimmunology
Date
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2003
Subject
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Male; Time Factors; Pain Threshold; Animals; Rats; Biomarkers of Pain; Injections; Subcutaneous; Enkephalin; Hindlimb; Wistar; Corticotropin-Releasing Hormone/administration & dosage; Dynorphins/antagonists & inhibitors/biosynthesis/physiology; Edema/immunology/metabolism/physiopathology; Endorphins/antagonists & inhibitors/biosynthesis/physiology; Freund's Adjuvant/administration & dosage; Inflammation/immunology/metabolism/physiopathology; Leukocytes/drug effects/metabolism/physiology; Methionine/antagonists & inhibitors/biosynthesis/physiology; Naloxone/administration & dosage; Pain/immunology/pathology/prevention & control; Stress/immunology/metabolism/physiopathology
Creator
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Machelska H; Schopohl JK; Mousa SA; Labuz D; Schafer M; Stein C
Description
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Neuroimmune interactions control pain through activation of opioid receptors on sensory nerves by immune-derived opioid peptides. Here we evaluate mechanisms of intrinsic pain inhibition at different stages of Freund's adjuvant-induced inflammation of the rat paw. We use immunohistochemistry and paw pressure testing. Our data show that in early (6 h) inflammation leukocyte-derived beta-endorphin, met-enkephalin and dynorphin A activate peripheral mu-, delta- and kappa-receptors to inhibit nociception. In addition, central opioid mechanisms seem to contribute significantly to this effect. At later stages (4 days), antinociception is exclusively produced by leukocyte-derived beta-endorphin acting at peripheral mu and delta receptors. Corticotropin-releasing hormone (CRH) is an endogenous trigger of these effects at both stages. These findings indicate that peripheral opioid mechanisms of pain inhibition gain functional relevance with the chronicity of inflammation.
2003
Identifier
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<a href="http://doi.org/10.1016/s0165-5728(03)00213-3" target="_blank" rel="noreferrer">10.1016/s0165-5728(03)00213-3</a>
Rights
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Article information provided for research and reference use only. PedPalASCNET does not hold any rights over the resource listed here. All rights are retained by the journal listed under publisher and/or the creator(s).
Type
The nature or genre of the resource
Journal Article
2003
Animals
Backlog
Biomarkers of Pain
Corticotropin-Releasing Hormone/administration & dosage
Dynorphins/antagonists & inhibitors/biosynthesis/physiology
Edema/immunology/metabolism/physiopathology
Endorphins/antagonists & inhibitors/biosynthesis/physiology
Enkephalin
Freund's Adjuvant/administration & dosage
Hindlimb
Inflammation/immunology/metabolism/physiopathology
Injections
Journal Article
Journal Of Neuroimmunology
Labuz D
Leukocytes/drug effects/metabolism/physiology
Machelska H
Male
Methionine/antagonists & inhibitors/biosynthesis/physiology
Mousa SA
Naloxone/administration & dosage
Pain Threshold
Pain/immunology/pathology/prevention & control
Rats
Schafer M
Schopohl JK
Stein C
Stress/immunology/metabolism/physiopathology
Subcutaneous
Time Factors
Wistar