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Pajediene E, Pajeda A, Urnieziute G, Paulekas E, Liesiene V, Bileviciute-Ljungar I, Jurkeviciene G, Petrikonis K. Subjective and objective features of sleep disorders in patients with acute ischemic or haemorrhagic stroke. Sleep Med 2017. [DOI: 10.1016/j.sleep.2017.11.726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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2
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Martinsen S, Flodin P, Berrebi J, Löfgren M, Bileviciute-Ljungar I, Mannerkorpi K, Ingvar M, Fransson P, Kosek E. The role of long-term physical exercise on performance and brain activation during the Stroop colour word task in fibromyalgia patients. Clin Physiol Funct Imaging 2017. [PMID: 28627125 DOI: 10.1111/cpf.12449] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The Stroop colour word test (SCWT) has been widely used to assess changes in cognitive performance such as processing speed, selective attention and the degree of automaticity. Moreover, the SCWT has proven to be a valuable tool to assess neuronal plasticity that is coupled to improvement in performance in clinical populations. In a previous study, we showed impaired cognitive processing during SCWT along with reduced task-related activations in patients with fibromyalgia. In this study, we used SCWT and functional magnetic resonance imagingFMRI to investigate the effects of a 15-week physical exercise intervention on cognitive performance, task-related cortical activation and distraction-induced analgesia (DIA) in patients with fibromyalgia and healthy controls. The exercise intervention yielded reduced fibromyalgia symptoms, improved cognitive processing and increased task-related activation of amygdala, but no effect on DIA. Our results suggest beneficial effects of physical exercise on cognitive functioning in FM.
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Affiliation(s)
- S Martinsen
- Department of Clinical Neuroscience, Osher Center for Integrative Medicine, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden.,Department of Neuroradiology, Karolinska University Hospital, Stockholm, Sweden
| | - P Flodin
- Center for Demographic and Aging research, Umeå Universitet, Umeå, Sweden.,Umeå Center for Functional Brain Imaging, Umeå Universitet, Umeå, Sweden
| | - J Berrebi
- Department of Clinical Neuroscience, Osher Center for Integrative Medicine, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden.,Department of Neuroradiology, Karolinska University Hospital, Stockholm, Sweden
| | - M Löfgren
- Department of Clinical Sciences, Danderyd Hospital, Karolinska Institutet, Stockholm, Sweden
| | - I Bileviciute-Ljungar
- Department of Clinical Sciences, Danderyd Hospital, Karolinska Institutet, Stockholm, Sweden
| | - K Mannerkorpi
- Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy, Gothenburg University, Gothenburg, Sweden
| | - M Ingvar
- Department of Clinical Neuroscience, Osher Center for Integrative Medicine, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden.,Department of Neuroradiology, Karolinska University Hospital, Stockholm, Sweden
| | - P Fransson
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - E Kosek
- Department of Clinical Neuroscience, Osher Center for Integrative Medicine, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden.,Department of Neuroradiology, Karolinska University Hospital, Stockholm, Sweden
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3
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Flodin P, Martinsen S, Mannerkorpi K, Löfgren M, Bileviciute-Ljungar I, Kosek E, Fransson P. Normalization of aberrant resting state functional connectivity in fibromyalgia patients following a three month physical exercise therapy. Neuroimage Clin 2015; 9:134-9. [PMID: 26413476 PMCID: PMC4556735 DOI: 10.1016/j.nicl.2015.08.004] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Revised: 07/29/2015] [Accepted: 08/06/2015] [Indexed: 11/24/2022]
Abstract
Physical exercise is one of the most efficient interventions to mitigate chronic pain symptoms in fibromyalgia (FM). However, little is known about the neurophysiological mechanisms mediating these effects. In this study we investigated resting-state connectivity using functional magnetic resonance imaging (fMRI) before and after a 15 week standardized exercise program supervised by physical therapists. Our aim was to gain an understanding of how physical exercise influences previously shown aberrant patterns of intrinsic brain activity in FM. Fourteen FM patients and eleven healthy controls successfully completed the physical exercise treatment. We investigated post- versus pre-treatment changes of brain connectivity, as well as changes in clinical symptoms in the patient group. FM patients reported improvements in symptom severity. Although several brain regions showed a treatment-related change in connectivity, only the connectivity between the right anterior insula and the left primary sensorimotor area was significantly more affected by the physical exercise among the fibromyalgia patients compared to healthy controls. Our results suggest that previously observed aberrant intrinsic brain connectivity patterns in FM are partly normalized by the physical exercise therapy. However, none of the observed normalizations in intrinsic brain connectivity were significantly correlated with symptom changes. Further studies conducted in larger cohorts are warranted to investigate the precise relationship between improvements in fibromyalgia symptoms and changes in intrinsic brain activity. Physical exercise reduced the impact of fibromyalgia (FM) in everyday life. Longitudinal changes included restored insular-sensory functional connectivity. The links between connectivity and symptom improvements require further studies.
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Affiliation(s)
- P Flodin
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - S Martinsen
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - K Mannerkorpi
- Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy, Gothenburg University, Gothenburg, Sweden
| | - M Löfgren
- Department of Clinical Sciences, Danderyd Hospital, Karolinska Institutet, Stockholm, Sweden
| | - I Bileviciute-Ljungar
- Department of Clinical Sciences, Danderyd Hospital, Karolinska Institutet, Stockholm, Sweden
| | - E Kosek
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - P Fransson
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
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4
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Ericsson A, Palstam A, Larsson A, Löfgren M, Bileviciute-Ljungar I, Bjersing J, Gerdle B, Kosek E, Mannerkorpi K. OP0286-HPR Resistance Exercise Improves Multidimensional Fatigue in Women with Fibromyalgia. A Randomized Controlled Trial. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.4790] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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5
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Pajediene E, Janusauskaite J, Samusyte G, Stasaitis K, Petrikonis K, Bileviciute-Ljungar I. Patterns of acute whiplash-associated disorder in the Lithuanian population after road traffic accidents. J Rehabil Med 2015; 47:52-7. [DOI: 10.2340/16501977-1892] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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6
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Maroti D, Westerberg A, Saury J, Bileviciute-Ljungar I. Computerized training improves verbal working memory in patients with myalgic encephalomyelitis/chronic fatigue syndrome: A pilot study. J Rehabil Med 2015; 47:665-8. [DOI: 10.2340/16501977-1976] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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7
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Larsson A, Palstam A, Löfgren M, Ernberg M, Bjersing J, Bileviciute-Ljungar I, Gerdle B, Kosek E, Mannerkorpi K. FRI0563-HPR Does Resistance Exercise Improve Physical Function, Health Status and Pain in Fibromyalgia? Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.4245] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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8
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Larsson A, Palstam A, Löfgren M, Ernberg M, Bjersing J, Bileviciute-Ljungar I, Gerdle B, Kosek E, Mannerkorpi K. AB0832-HPR Resistance exercise training for women with fibromyalgia. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2013-eular.3154] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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9
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Bileviciute-Ljungar I, Häglund V, Carlsson J, Heijne A. Clinical and radiological findings in methadone-induced delayed leukoencephalopathy. J Rehabil Med 2014; 46:828-30. [DOI: 10.2340/16501977-1820] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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10
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Bileviciute-Ljungar I. 833 EVALUATION OF HEALTH-and PAIN-RELATED PARAMETERS IN CHRONIC PAIN PATIENTS 1 YEAR AFTER INTERVENTION. Eur J Pain 2006. [DOI: 10.1016/s1090-3801(06)60836-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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11
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Bileviciute-Ljungar I, Saxne T, Spetea M. Anti-inflammatory effects of contralateral administration of the kappa-opioid agonist U-50,488H in rats with unilaterally induced adjuvant arthritis. Rheumatology (Oxford) 2005; 45:295-302. [PMID: 16249243 DOI: 10.1093/rheumatology/kei156] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVE The effect of repeated contralateral treatment with the kappa-opioid receptor agonist U-50,488H {trans-(+/-)-3,4-dichloro-N-methyl-N-[2-(1-pyrrolidinyl)-cyclohexyl]-benzene acetamide methanesulphonate} was investigated in rats with unilaterally induced adjuvant arthritis. METHODS Arthritis was induced by injection of Mycobacterium butyricum into the right hindpaw. Inflammatory parameters, nociceptive behaviour and cartilage turnover were evaluated up to 21 days after induction of arthritis. RESULTS Contralateral treatment with 0.3 mg U-50,488H into the left hindpaw twice per week reduced the hindpaw oedema, ankle joint inflammation, pain behaviour to mechanical stimuli and severity score of inflammation in the hindpaws of both sides as well as the systemic spread of inflammation to other areas, e.g. tail and/or forepaws, compared with saline-treated animals. Moreover, a significant decrease in the levels of cartilage oligomeric matrix protein was found in animals treated with U-50,488H, suggesting reduction of cartilage damage. The anti-inflammatory and chondroprotective effects of U-50,488H were abolished by administration of the peripheral opioid receptor antagonist naloxone methiodide. CONCLUSIONS This is the first report demonstrating that repeated contralateral administration of a kappa-opioid receptor agonist diminishes the development of a symmetrical joint disorder.
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MESH Headings
- 3,4-Dichloro-N-methyl-N-(2-(1-pyrrolidinyl)-cyclohexyl)-benzeneacetamide, (trans)-Isomer/administration & dosage
- 3,4-Dichloro-N-methyl-N-(2-(1-pyrrolidinyl)-cyclohexyl)-benzeneacetamide, (trans)-Isomer/therapeutic use
- Analgesics, Non-Narcotic/administration & dosage
- Analgesics, Non-Narcotic/therapeutic use
- Animals
- Ankle Joint/pathology
- Antirheumatic Agents/administration & dosage
- Antirheumatic Agents/therapeutic use
- Arthritis, Experimental/pathology
- Arthritis, Experimental/prevention & control
- Body Weight
- Drug Administration Schedule
- Edema/drug therapy
- Edema/pathology
- Female
- Hindlimb/pathology
- Pain/prevention & control
- Pain Measurement
- Rats
- Rats, Inbred Lew
- Receptors, Opioid, kappa/agonists
- Severity of Illness Index
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Affiliation(s)
- I Bileviciute-Ljungar
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden.
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12
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Bileviciute-Ljungar I, Biella G, Bellomi P, Sotgiu ML. Contralateral treatment with lidocaine reduces spinal neuronal activity in mononeuropathic rats. Neurosci Lett 2001; 311:157-60. [PMID: 11578818 DOI: 10.1016/s0304-3940(01)02154-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In anaesthetised and paralysed rats with chronic constriction of the sciatic nerve, the effects of subcutaneous contralateral lidocaine (100 microl) on the activity of lumbar (L(4)-L(5)) wide dynamic range neurons ipsilateral to the constriction have been investigated. The results show reduction of the spontaneous hyperactivity for 60 min; suppression or reduction of the responses to contralateral noxious stimulation for 60 min; lack of effect on the responses to ipsilateral noxious stimulation, except for the afterdischarge duration, reduced for 60 min. The finding that the altered neuronal activity following peripheral nerve injury associated to behavioural signs of neuropathic pain, can be reduced by contralateral treatment, may provide further suggestions to neuropathic pain mechanisms and management.
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Affiliation(s)
- I Bileviciute-Ljungar
- Department of Physiology and Pharmacology, Karolinska Institutet, 17177 Stockholm, Sweden.
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13
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Stener-Victorin E, Lundeberg T, Waldenström U, Bileviciute-Ljungar I, Janson PO. Effects of electro-acupuncture on corticotropin-releasing factor in rats with experimentally-induced polycystic ovaries. Neuropeptides 2001; 35:227-31. [PMID: 12030806 DOI: 10.1054/npep.2002.0878] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The aims of the present study were to investigate corticotropin-releasing factor (CRF) concentrations in the brain, the adrenal glands, and the ovaries in rats with estradiol valerate (EV) induced polycystic ovaries (PCO). The effect of 12 electro-acupuncture (EA) treatments on CRF concentrations was also investigated. The CRF concentrations in the median eminence (ME) were significantly increased in rats with PCO (both the PCO control group and the PCO group receiving EA) compared with the healthy control group (veichle control group), indicating increased activity in the hypothalamus-pituitary axis. The CRF concentrations in the ovaries were significantly reduced in the PCO group receiving EA compared with the PCO control group. Also, there was a decrease in comparison withthe healthy control group but the decrease was not as significant. This finding indicates that repeated EA treatments change the neuroendocrinological state in the ovaries, which may play an important role in reproductive failure.
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Affiliation(s)
- E Stener-Victorin
- Department of Obstetrics and Gynecology, Göteborg University, Sweden.
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14
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Bileviciute-Ljungar I, Lundeberg T. Contralateral but not systemic administration of bupivacaine reduces acute inflammation in the rat hindpaw. Somatosens Mot Res 2001; 17:285-93. [PMID: 10994598 DOI: 10.1080/08990220050117637] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
The effects of contralateral treatment with local anesthetics following acute hindpaw inflammation were investigated in rats. Inflammation was induced by unilateral injection of either 50 or 100 microl of 1% carrageenan into the right paw. Contralateral injection of either bupivacaine or saline was given immediately before the carrageenan. Hindpaw edema and withdrawal responses to thermal and mechanical stimulation were evaluated after 3, 6 and 24h. The results showed that the pro-inflammatory effects of carrageenan were strongest at 6 h after the injection of 100 microl carrageenan with bilaterally decreased withdrawal latencies and ipsilateral edema formation. Contralateral treatment with bupivacaine (1.25, 2.5 or 5 mg/ml) dose-dependently reduced nociceptive behavior for 3-24h. The edema was also reduced at 6h. No effects on pain-related behavior were observed following systemic administration of bupivacaine. Sciatic nerve ligation on the contralateral side or intrathecal administration of saline significantly reduced the effects of bupivacaine when respectively compared with sham-operation and subcutaneous saline injection. Contralateral treatment with bupivacaine into the knee joint induced the same anti-nociceptive effect as administered into the paw. Our findings indicate that contralateral administration of bupivacaine induces long-lasting anti-nociceptive effects and may serve as a new or complementary treatment approach in acute inflammatory pain conditions.
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Affiliation(s)
- I Bileviciute-Ljungar
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden.
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15
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Bileviciute-Ljungar I, Spetea M. Contralateral but not systemic administration of the kappa-opioid agonist U-50,488H induces anti-nociception in acute hindpaw inflammation in rats. Br J Pharmacol 2001; 132:252-8. [PMID: 11156584 PMCID: PMC1572540 DOI: 10.1038/sj.bjp.0703782] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
1. The anti-nociceptive effects of contralateral administration of kappa-opioid agonist U-50,488H were investigated in rats. 2. Inflammation was induced by unilateral injection of 1% carrageenan into the right hindpaw. Prior to carrageenan injection, U-50,488H or saline was administered into the left hindpaw. Withdrawal responses to mechanical and heat stimulation and oedema levels were evaluated at 3, 6 and 24 h post-carrageenan injection. 3. The results showed that the inflammatory effect of 1% carrageenan peaked after 6 h with bilateral decreases in withdrawal latencies and ipsilateral oedema formation. 4. Contralateral treatment with 0.01, 0.05, 0.3 and 2 mg of U-50,488H attenuated nociceptive reflexes to mechanical stimulation on the inflamed side at 6 h. The anti-nociceptive effect of contralateral treatment was dose-dependent at 3 and 24 h. The hindpaw withdrawal latencies to heat stimulation were prolonged at 3 and 24 h after contralateral treatment with 0.3 mg U-50,488H. No effect on inflammatory oedema formation was observed, except for a decrease at 3 h after treatment with 2 mg of U-50,488H. 5. Sciatic nerve denervation on the contralateral side abolished the anti-nociceptive effects of U-50,488H (0.3 and 2 mg). In contrast, contralateral injection of 1 mg morphine prolonged paw latencies in denervated rats. 6. Both co-administration of the peripherally selective opioid antagonist naloxone methiodide with 0.3 mg U-50,488H, and alternatively, systemic administration of 0.3 mg U-50,488H reversed the anti-nociceptive effects induced by contralateral injection of U-50,488H. 7. Taken together, our findings indicate that the contralateral administration of U-50,488H attenuates nociceptive behaviour resulting from acute inflammation. The effect is mediated via peripheral neuronal kappa-opioid receptors and, possibly, spinal cord mechanisms, suggesting a new treatment approach for acute inflammatory conditions.
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MESH Headings
- 3,4-Dichloro-N-methyl-N-(2-(1-pyrrolidinyl)-cyclohexyl)-benzeneacetamide, (trans)-Isomer/administration & dosage
- 3,4-Dichloro-N-methyl-N-(2-(1-pyrrolidinyl)-cyclohexyl)-benzeneacetamide, (trans)-Isomer/antagonists & inhibitors
- 3,4-Dichloro-N-methyl-N-(2-(1-pyrrolidinyl)-cyclohexyl)-benzeneacetamide, (trans)-Isomer/pharmacology
- Acute Disease
- Analgesics, Opioid/administration & dosage
- Analgesics, Opioid/pharmacology
- Animals
- Behavior, Animal/drug effects
- Denervation
- Hindlimb/pathology
- Hot Temperature
- Inflammation/chemically induced
- Inflammation/complications
- Inflammation/pathology
- Male
- Naloxone/analogs & derivatives
- Naloxone/pharmacology
- Pain/drug therapy
- Pain/etiology
- Pain Measurement
- Physical Stimulation
- Quaternary Ammonium Compounds
- Rats
- Rats, Sprague-Dawley
- Receptors, Opioid, kappa/agonists
- Sciatic Nerve
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Affiliation(s)
- I Bileviciute-Ljungar
- Department of Physiology and Pharmacology, Karolinska Institutet, 171 77 Stockholm, Sweden.
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16
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Veraksits A, Bileviciute-Ljungar I, Maaroos J, Vasar E, Lundeberg T. Neuronal mechanisms contribute to corticotropin-releasing factor-induced anti-oedema effect in the rat hind paw. Neuropeptides 2000; 34:129-34. [PMID: 10985930 DOI: 10.1054/npep.2000.0800] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The present study is designed to elucidate the involvement of neuronal mechanisms in corticotropin-releasing factor (CRF)-induced anti-oedema effects. Oedema was induced in the rat hind paw by subcutaneous injection of 3 nmol of serotonin (5-HT). A single dose of CRF (9.4, 37.5 or 75 pmol) was given either ipsilaterally or contralaterally 30 min before 5-HT injection and oedema formation was subsequently measured every 30 min for 5.5 h. Compared to saline pre-treatment CRF (37.5 pmol) reduced oedema formation for 3.5 h when given ipsilaterally, and at 1.5 h (9.33, 37.5 and 75 pmol) when injected contralaterally. Administration of CRF along with CRF receptor antagonist, alpha-helical CRF, abolished the anti-oedema effects of CRF. Sciatic nerve ligation on the injected side attenuated the ipsilateral CRF-induced anti-oedema effect when compared with saline pre-treatment and sham-operated rats. Ipsilateral pre-treatment with 37.5 pmol of CRF caused a reduction in hind paw temperature compared to treatment with saline. Results of the present study indicate that the nervous system contributes to CRF effects in 5-HT-induced oedema formation.
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Affiliation(s)
- A Veraksits
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden.
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Abstract
The aim of the present study was to establish whether contralateral treatment with local anaesthetics reduces nociceptive behaviour in mononeuropathic rats. Contralateral treatment with xylocaine on day 6 and 11 following sciatic nerve ligation increased withdrawal latencies to thermal but not to mechanical stimulation for 3-4 days. Rats who received contralateral treatment with xylocaine on day 6 and 11 showed a reduced autotomy score during the following 6 weeks. To compare ipsilateral and contralateral effects another set of experiments was performed. Rats treated contralaterally on day 11 had a significantly lower autotomy score at week 4 and 6. Our results demonstrate that contralateral treatment with xylocaine reduces nociceptive behaviour in mononeuropathic rats for days or weeks.
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