Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0184567 (acute pain)
 3,962 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Pharmacological effects of a novel opioid receptor-like1 (ORL(1)) receptor antagonist, [N-(4-amino-2-methylquinolin-6-yl)-2-(4-ethylphenoxymethyl) benzamide monohydrochloride] (JTC-801), were examined in in vitro and in vivo. JTC-801 inhibited the binding of [(3)H]-nociceptin to human ORL(1) receptors expressed in HeLa cells with a K(i) value of 44.5 nM. JTC-801 completely antagonized the suppression of nociceptin on forskolin-induced accumulation of cyclic AMP (IC(50) : 2.58 microM) using ORL(1) receptor expressing HeLa cells in vitro. In in vivo, when given intravenously at dosages of 0.01 mg kg(-1) and above, or orally at dosages 1 mg kg(-1) and above, JTC-801 antagonized the nociceptin-induced allodynia in mice. Effects of JTC-801 on various nociceptive models were examined. In mouse hot-plate test, JTC-801 prolonged escape response latency (ERL) to exposed heat stimulus with minimum effective doses (MED) of 0.01 mg kg(-1) by i.v. or 1 mg kg(-1) by p.o. In the rat formalin test, JTC-801 reduced both the first and second phases of the nociceptive response with MED of 0.01 mg kg(-1) by i.v. administration or 1 mg kg(-1) by p.o. administration. This anti-nociceptive action of JTC-801 was not inhibited by naloxone (10 mg kg(-1), s.c.). We have demonstrated that JTC-801 antagonizes the ORL(1) receptor response, and that JTC-801 has efficacious and potent anti-nociceptive effects in acute pain animal models not only by intravenous injection but also oral administration. These results suggest that JTC-801 may represent a new class of analgesics.
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PMID:Pharmacological profiles of a novel opioid receptor-like1 (ORL(1)) receptor antagonist, JTC-801. 1181 67

Both presynaptic and postsynaptic alterations are associated with plastic changes of brain circuits, such as learning and memory, drug addiction and chronic pain. However, the dissection of the relative contributions of pre- and postsynaptic components to brain functions is difficult. We have previously shown peripheral inflammation caused both presynaptic and postsynaptic changes and calcium-stimulated cyclic AMP (cAMP) pathway in the anterior cingulate cortex (ACC) is critical in the synaptic plasticity and behavioral sensitization to pain. It remains to be elucidated whether presynaptic or postsynaptic modulation by cAMP in the ACC could be sufficient for enhancing inflammatory pain. In order to address this question, we took advantage of a novel transgenic mouse model, heterologously expressing an Aplysia octopamine receptor (Ap oa1). This receptor is G protein-coupled and selectively activates the cAMP pathway. We found that activation of Ap oa1 by octopamine enhanced glutamatergic synaptic transmission in the ACC by increasing presynaptic glutamate release in vitro. Bilateral microinjection of octopamine into the ACC significantly facilitated behavioral responses to inflammatory pain but not acute pain. The present study provides the first evidence linking enhanced presynaptic glutamate release in the ACC to behavioral sensitization caused by peripheral inflammation.
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PMID:Enhancement of presynaptic glutamate release and persistent inflammatory pain by increasing neuronal cAMP in the anterior cingulate cortex. 1882 48

Labor pain has been reported as a severe pain and can be considered as a model of acute visceral pain. It is well known that extracellular purines have an important role in pain signaling in the central nervous system. This study analyzes the relationship between extracellular purines and pain perception during active labor. A prospective observational study was performed. Cerebrospinal fluid (CSF) levels of the purines and their metabolites were compared between women at term pregnancy with labor pain (n = 49) and without labor pain (Caesarian section; n = 47). Control groups (healthy men and women without chronic or acute pain-n = 40 and 32, respectively) were also investigated. The CSF levels of adenosine were significantly lower in the labor pain group (P = 0.026) and negatively correlated with pain intensity measured by a visual analogue scale (r = -0.48, P = 0.0005). Interestingly, CSF levels of uric acid were significantly higher in healthy men as compared to women. Additionally, pregnant women showed increased CSF levels of ADP, GDP, adenosine and guanosine and reduced CSF levels of AMP, GTP, and uric acid as compared to non-pregnant women (P < 0.05). These findings suggest that purines, in special the nucleoside adenosine, are associated with pregnancy and labor pain.
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PMID:Changes in Purines Concentration in the Cerebrospinal Fluid of Pregnant Women Experiencing Pain During Active Labor. 2640 94