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The development of neuropathic pain is associated with multiple changes in gene expression occurring in the dorsal root ganglia (DRG) and spinal cord. The goal of this study was to evaluate whether the disruption of CB1 cannabinoid receptor gene modulates the changes induced by neuropathic pain in the expression of mu- (MOR), delta- (DOR) and kappa-opioid(More)
The antinociception induced by the intraperitoneal coadministration of combinations of paracetamol with the nonsteroidal anti-inflammatory drugs (NSAIDs) diclofenac, ibuprofen, ketoprofen, meloxicam, metamizol, naproxen, nimesulide, parecoxib and piroxicam was studied by isobolographic analysis in the acetic acid abdominal constriction test of mice(More)
The effect of two commonly used methods to immobilize the animals, viz. tube restrainer and wrapping in a diaper (chux) on the tail flick latency in immersion test, was evaluated in mice using a stimulus temperature of 50 degrees C. The animals were immobilized either in the tube or chux briefly (25-30 sec) during the tail flick measurements. The basal tail(More)
In humans, remifentanil anesthesia enhances nociceptive sensitization in the postoperative period. We hypothesized that activation of extracellular signal-regulated kinases 1 and 2 (ERK1/2) and the expression of c-Fos, prodynorphin (mRNA), and dynorphin in the spinal cord could participate in the molecular mechanisms underlying postoperative opioid-induced(More)
BACKGROUND Opioid-induced delayed hyperalgesia and allodynia have been reported in human and animal models. The authors evaluated the influence of different opioids used during clinical anesthesia on nociceptive sensitivity and incisional pain in mice. The role of the inducible nitric oxide synthase on surgical pain and opioid-induced pronociception also(More)
The ultra-short-acting mu-opioid receptor (MOR) agonist remifentanil enhances postsurgical pain when used as main anesthetic in animal models and man. Although the mechanism/s involved are poorly characterized, changes in opioid receptor expression could be a relevant feature. Using a mouse model of postoperative pain, we assessed the expression of MOR and(More)
The effects of morphine on plasma corticosterone and hypothalamic noradrenaline (NA) and dopamine (DA) content were studied in naive and in morphine-tolerant rats. Acutely administered morphine (30 mg/kg i.p.) significantly increased the plasma levels of corticosterone and significantly reduced the hypothalamic NA and DA content. In chronically(More)
The long-lasting post-surgical changes in nociceptive thresholds in mice, indicative of latent pain sensitization, were studied. The contribution of kappa opioid and N-methyl-d-aspartate (NMDA) receptors was assessed by the administration of nor-binaltorphimine or MK-801; dynorphin levels in the spinal cord were also determined. Animals underwent a plantar(More)
In the gut, mu-, delta-, and kappa-opioid receptors are present in the submucous and myenteric plexi and in enterocytes. Using pharmacological methods, our group has shown that intestinal inflammation enhances the antitransit and antisecretory effects of systemic opioids. The aim of the present study was to evaluate whether the enhanced antisecretory(More)
The purpose of the present study was to characterize the antinociceptive effects of tramadol, fentanyl and morphine, when two of them were systemically combined in a 1:1 potency ratio, in the hot plate, the acetic acid writhing, and the formalin tests in mice. Interaction indexes and isobolographic analysis were used to assess the type of interaction.(More)