Title : Cell-type specific activation of p38 and ERK mediates calcitonin gene-related peptide involvement in tolerance to morphine-induced analgesia.

Pub. Date : 2009 Aug

PMID : 19299480






9 Functional Relationships(s)
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1 Cell-type specific activation of p38 and ERK mediates calcitonin gene-related peptide involvement in tolerance to morphine-induced analgesia. Morphine calcitonin-related polypeptide alpha Rattus norvegicus
2 We previously suggested a possible role for spinal calcitonin gene-related peptide (CGRP) in the development of tolerance to morphine-induced analgesia. Morphine calcitonin-related polypeptide alpha Rattus norvegicus
3 We previously suggested a possible role for spinal calcitonin gene-related peptide (CGRP) in the development of tolerance to morphine-induced analgesia. Morphine calcitonin-related polypeptide alpha Rattus norvegicus
4 In the present study, we demonstrate that CGRP is involved in morphine tolerance by differentially regulating the ERK-dependent up-regulation of IL-1beta, TNF-alpha, and microsomal prostaglandin E synthase-1 (mPGES-1) in astrocytes and p38-dependent up-regulation of IL-6 in microglia in the rat spinal cord. Morphine calcitonin-related polypeptide alpha Rattus norvegicus
5 A 7-d treatment with morphine induced tolerance to the antinociceptive effect and increased phosphorylated ERK localized in astrocytes and phosphorylated p38 enriched in microglia, both effects being inhibited by blocking CGRP receptors. Morphine calcitonin-related polypeptide alpha Rattus norvegicus
6 Taken together, these data suggest that chronic morphine induces the synthesis of CGRP, which in turn acts on CGRP receptors located on astrocytes and microglia to stimulate ERK and p38, respectively, leading to increased synthesis and release of proinflammatory mediators resulting in tolerance to morphine-induced analgesia. Morphine calcitonin-related polypeptide alpha Rattus norvegicus
7 Taken together, these data suggest that chronic morphine induces the synthesis of CGRP, which in turn acts on CGRP receptors located on astrocytes and microglia to stimulate ERK and p38, respectively, leading to increased synthesis and release of proinflammatory mediators resulting in tolerance to morphine-induced analgesia. Morphine calcitonin-related polypeptide alpha Rattus norvegicus
8 Taken together, these data suggest that chronic morphine induces the synthesis of CGRP, which in turn acts on CGRP receptors located on astrocytes and microglia to stimulate ERK and p38, respectively, leading to increased synthesis and release of proinflammatory mediators resulting in tolerance to morphine-induced analgesia. Morphine calcitonin-related polypeptide alpha Rattus norvegicus
9 Taken together, these data suggest that chronic morphine induces the synthesis of CGRP, which in turn acts on CGRP receptors located on astrocytes and microglia to stimulate ERK and p38, respectively, leading to increased synthesis and release of proinflammatory mediators resulting in tolerance to morphine-induced analgesia. Morphine calcitonin-related polypeptide alpha Rattus norvegicus