Cytokine-mediated Inflammatory Hyperalgesia Limited by Interleukin-4
Overview
Affiliations
1. The effect of IL-4 on responses to intraplantar (i.pl.) carrageenin, bradykinin, TNFalpha, IL-1beta, IL-8 and PGE2 was investigated in a model of mechanical hyperalgesia in rats. Also, the cellular source of the IL-4 was investigated. 2. IL-4, 30 min before the stimulus, inhibited responses to carrageenin, bradykinin, and TNFalpha, but not responses to IL-1beta, IL-8 and PGE2. 3. IL-4, 2 h before the injection of IL-1beta, did not affect the response to IL-1beta, whereas IL-4, 12 or 12+2 h before the IL-1beta, inhibited the hyperalgesia (-30%, -74%, respectively). 4. In murine peritoneal macrophages, murine IL-4 for 2 h before stimulation with LPS, inhibited (-40%) the production of IL-1beta but not PGE2. Murine IL-4 (for 16 h before stimulation with LPS) inhibited LPS-stimulated PGE2 but not IL-1beta. 5. Anti-murine IL-4 antibodies potentiated responses to carrageenin, bradykinin and TNFalpha, but not IL-1beta and IL-8, as well as responses to bradykinin in athymic rats but not in rats depleted of mast cells with compound 40/80. 6. These data suggest that IL-4 released by mast cells limits inflammatory hyperalgesia. During the early phase of the inflammatory response the mode of action of the IL-4 appears to be inhibition of the production TNFalpha, IL-1beta and IL-8. In the later phase of the response, in addition to inhibiting the production of pro-inflammatory cytokines, IL-4 also may inhibit the release of PGs.
Interleukin-4 Induces the Release of Opioid Peptides from M1 Macrophages in Pathological Pain.
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PMID: 33593854 PMC: 8018889. DOI: 10.1523/JNEUROSCI.3040-20.2021.
IL-4 induces M2 macrophages to produce sustained analgesia via opioids.
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PMID: 32102987 PMC: 7101153. DOI: 10.1172/jci.insight.133093.
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PMID: 31193742 PMC: 6538929. DOI: 10.1016/j.omtm.2019.04.008.
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PMID: 29623147 PMC: 5829432. DOI: 10.1155/2018/8564215.
Targeting Cytokines for Morphine Tolerance: A Narrative Review.
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PMID: 29189168 PMC: 6482476. DOI: 10.2174/1570159X15666171128144441.