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• W2057403026 abstract "Unilateral intraplantar injection of Freund's complete adjuvant (FCA) into 1 hind paw of rats was used as a model of peripheral inflammation and persistent pain in order to examine time course effects of a continuous barrage of nociceptive input on the second-messenger transducing systems in the spinal cord. cAMP, cGMP and inositol 1,4,5-trisphosphate (insP3) were extracted from the lumbosacral cord at days 1, 7, 14, 21 and 42 following FCA injection and quantified by either radioreceptor-assay (RRA) or radioimmunoassay (RIA). The lumbosacral contents of cAMP and cGMP when quantified in whole lumbosacral cord segment were not significantly changed by FCA treatment at all time points. InsP3 accumulation was significantly increased on days 14, 21 and 42 following FCA injection relative to sham-treated time-matched controls. However, cGMP and insP3 contents were significantly increased in the left longitudinal half of the lumbar enlargement ipsilateral to the injected paw on day 21 following FCA treatment, but not in the sham-treated time-matched controls. With [3H]insP3 as a ligand, Scatchard (Rosenthal) analyses of the concentration-dependent saturation curves showed that the densities (Bmax) of insP3 receptors (insP3R) were significantly increased throughout the time course of adjuvant-induced peripheral inflammation. The binding affinities (KD) for insP3R were significantly decreased on days 7, 14 and 21 following FCA injection corresponding to the times of most stable and peak inflammation. InsP3R from the cerebelli of the same rats as used in the lumbosacral insP3R characterization was used as a positive control in this study and did not show any change in both Bmax and KD as a result of FCA treatment, thus demonstrating that the changes in lumbosacral insP3R characteristics might be specific to the nociceptive sensory pathway such as the spinal cord. Thus it appears that sustained afferent nociceptive input induced by FCA injection increased the accumulation of cGMP, insP3 and insP3R density in the spinal cord through increased neuronal activities of functional receptors coupled to major classes of chemical mediators of nociception including neuropeptides and excitatory aminoacids. Changes in insP3 accumulation in the lumbosacral cord following FCA injection were significantly correlated with changes in insP3R density. Changes in the ratios of lumbosacral insP3 contents and insP3R density were also significantly correlated with changes in body weight and hind paw size induced by FCA injection.(ABSTRACT TRUNCATED AT 400 WORDS)" @default.
• W2057403026 created "2016-06-24" @default.
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• W2057403026 date "1994-07-01" @default.
• W2057403026 modified "2023-09-24" @default.
• W2057403026 title "Regulation of the second-messenger systems in the rat spinal cord during prolonged peripheral inflammation" @default.
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• W2057403026 doi "https://doi.org/10.1016/0304-3959(94)90185-6" @default.
• W2057403026 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/7970840" @default.
• W2057403026 hasPublicationYear "1994" @default.
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