Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0344307 (analgesia)
 28,200 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Initial responsiveness to morphine was studied in two inbred strains of mice, C57BL/6J and DBA/2J, and their F1 hybrid, using both a hot-plate analgesia test and a locomotor-activity test. Three dose levels of morphine were used, 0 mg/kg 5 mg/kg, and 15 mg/kg. The inclusion of the 0 mg/kg group revealed differences between the inbred strains in the effects of test experience. These data also led to some new conclusions about the differences in responsiveness to morphine between the strains studied. On both tests, the DBA mice showed no effect of morphine, the C57 mice showed large effects, and the F1 mice showed an intermediate effect.
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PMID:Genotype and test experience determine responsiveness to morphine. 41 28

Analgesia and locomotor activity are genetically differentiated in C 57 and DBA mice. In fact, DBA strain, unlike C 57, is very sensitive to the analgesic effects of morphine. On the contrary, morphine elicits an increase of locomotor activity only in C 57 mice. We have used this genetic approach to study the in vitro response of vas deferens contractions to morphine and methionine-enkephalin. The results obtained are the following: 1. The percentage of morphine inhibition of the electrically evoked contractions of the longitudinal muscle of the vas deferens is greater in DBA strain, which is sensitive to the analgesic effects of morphine, than in C 57 mice in which morphine exerts a stimulating effect of the locomotor activity; 2. Met-enkephalin has been found to be more active than morphine on the same preparation; 3. The inhibitory effects of Met-enkephalin appear to be greater in C 57 than in DBA mice; 4. Different doses of Naltrexone are required to reverse the effects of morphine and Met-enkephalin; 5. Cumulative doses of Met-enkephalin and morphine induce different responses in the vas deferens of C 57 and DBA mice. The results emphasize the usefulness to study analgesic activity in these strains of mice.
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PMID:Genotype dependent response of morphine and methionine-enkephalin on the electrically induced contractions of the mouse vas deferens. 72 70

Groups of two inbred strains of mice (C 57 B1/6J and DBA/2J) with septal and control lesions were tested for morphine-induced analgesia and running activity (running fit). As previously observed the effects of morphine on the running fit and analgesia were strain-dependent and a negative strain correlation was evident between the two measures in C 57 and DBA operated control mice which are characterized by different brain levels and turnover of cholinergic and adrenergic mediators. Septal lesions, which cause a reduction in the levels of acetylcholine in the brain areas which receive a cholinergikc input from the septum, anatogonized morphine analgesia in both strains while the running fit syndrome was unaffected. Pharmacological manipulation of brain catecholamines did not interfer with morphine-induced analgesia. The effacts of different pharmacological agents with interfere with noradrenaline synthesis and catecholamine oxidation were assessed in the two strains which are characterized by presence (C 57) or absence (DBA) of increased motor activity following the injection of morphine. The results argue against an exclusive association of morphine-induced motor activity with noradrenergic mechanism.
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PMID:Morphine-induced running analgesia in two strains of mice following septal lesions or modification of brain amines. 110 Oct 77

A genetic analysis of morphine-induced analgesia and activity was conducted in mice belonging to the strains BALB/cJ, C57BL/6J, DBA/2J and to their F1 and backcross progenies. The results support previous findings showing that a negative correlation is evident between these two behavioral measures and support that their mode of inheritance is characterized by dominance or partial dominance. The biometric analysis conducted on the parental, F1 hybrid and backcross populations indicates very clearly that the effects of morphine are genetically determined.
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PMID:A genetic analysis of morphine-induced running and analgesia in the mouse. 115 8

The effects of a number of 5-HT receptor ligands were examined on nonopioid defensive analgesia in male DBA/2 mice. MDL 73005EF (0.05-1.0 mg/kg), a selective 5-HT1A receptor agonist, potently and dose-dependently inhibited the analgesic consequences of social defeat. CGS 12066B (0.5-10.0 mg/kg) and MK-212 (0.3-10.0 mg/kg), selective agonists for 5-HT1B and 5-HT1C sites, respectively, failed to influence this particular form of adaptive pain inhibition. Two 5-HT2/1C receptor antagonists, ritanserin (0.05-10.0 mg/kg) and ICI 169.369 (0.3-10.0 mg/kg), were also devoid of specific effects upon defensive analgesia. Both ritanserin and ICI 169,369 were found to have intrinsic analgetic efficacy and to induce behavioural changes indicative of increased defensiveness. These data, together with previous findings, confirm the specific involvement of 5-HT1A receptor mechanisms in the analgesic consequences of social defeat in male mice. Results are discussed in relation to the role of anxiety in adaptive pain inhibition.
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PMID:Differential effects of novel ligands for 5-HT receptor subtypes on nonopioid defensive analgesia in male mice. 179 10

The analgesic response (tail-flick latency) induced by the muscarinic cholinergic agonist oxotremorine was investigated in DBA/2 mice exposed to acute (a single 2 h session) and chronic (2 h once daily for 10 days) restraint stress. While a single exposure to stress did not influence the antinociceptive effects of the cholinergic agonist, chronic stress induced a clear-cut reduction of the oxotremorine-induced analgesia. The results show an involvement of cholinergic mechanisms in the adaptive modulation of nociception after chronic stressful events.
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PMID:Reduction of oxotremorine-induced analgesia after chronic but not acute restraint stress. 188 4

1. Four different strains of mice were used to study the influence of psychogenetics in opiate tolerance and abstinence. 2. The CD1 strain seemed to be more sensitive to naloxone administration after four days of morphine implantation, because administration of the antagonist induces a number of jumps in the withdrawal phase higher than in the case of the DBA or C3H strains. 3. DBA and C3H mice elicit analgesia before the CD1 strain, whereas the C3H mice lose body weight at a faster rate than the other strains. 4. C57 bl mice died after morphine implantation (100%). 5. These findings are discussed in relation with neurochemical and receptor variations.
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PMID:Influence of psychogenetics in opiate tolerance and abstinence in mice. 193 7

1. Prominent strain differences of mice were found in analgesic effects of D-amino acids. 2. In C57BL/6CrSlc and C3H/HeSlc mice, pain threshold, which was determined by using a hot-plate method, increased to 140-175% of the control after the systemic treatment of all three D-amino acids employed, such as D-phenylalanine, -leucine and -methionine, whereas in DBA/2CrSlc or BALB/cCrSlc mice, out of three only one D-amino acid, D-phenylalanine or -leucine, produced significant increase of pain threshold. 3. This lack of ability to perceive analgesic effects of specific amino acids observed in the latter two strains suggests that there probably exist different analgesia-inducing mechanisms for each of three D-amino acids in mice and the latter two strains lack two of them.
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PMID:Analgesic effects of D-amino acids in four inbred strains of mice. 198 75

The two inbred strains of mice C57BL/6 and DBA/2 are characterized by a different behavioral reactivity to cholinergic agents during development. The present experiment revealed that the strain-dependent differences in cholinergic-mediated analgesia during development disappeared during adult life. In fact, oxotremorine administration (0.0025 and 0.005 mg/kg) exerted the same analgesic effect in both strains at 6 months of age, in contrast with the finding of the lack of any effect of the drug in C57 mice at two months of age in comparison with DBA.
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PMID:Age-related cholinergic drug effects on analgesia in two inbred strains of mice. 232 40

Using the hot plate assay of analgesia, several investigators have reported DBA/2J mice to be much more sensitive to morphine and other opioids than C57BL/6J mice using paw-lick as the behavioral end point. In the present studies, we compared DBA/2J, C57BL/6J, and C3H/HeJ mice on two behavioral end points, either (1) the initial response to the hot plate, either a hind paw-lift, paw-shake, or paw-lick, whichever occurred first, or (2) the paw-lick response. In response to either morphine or saline, all three strains showed roughly equivalent latencies to the initial response, but the DBA/2J strain was markedly slow to show paw-lick as a nocifensive response compared to the C57BL/6J strain. As a result, only for the paw-lick response were there significant differences among the three inbred strains in morphine analgesia. Thus, differences in analgesic sensitivity among these strains are largely a function of the behavioral end point used to assess nociception to the hot plate.
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PMID:Inbred strain differences in morphine-induced analgesia with the hot plate assay: a reassessment. 235 15


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