Abstract
The experimental arthritis of the knee joint used in the present study leads to joint swelling, increased joint temperature, limping, guarding, and a decrease in paw withdrawal latency (PWL) to radiant heat (hyperalgesia) within hours in rats. Unexpectedly, administration of the non-NMDA receptor antagonist, CNQX, in the spinal cord 4 h after initiation of the arthritis significantly reduced the degree of joint inflammation and returned PWL times to baseline. Therefore, the present results indicate that established joint swelling and hyperalgesia can be reduced significantly by CNQX.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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6-Cyano-7-nitroquinoxaline-2,3-dione / administration & dosage
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6-Cyano-7-nitroquinoxaline-2,3-dione / therapeutic use*
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Animals
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Arthritis, Experimental / complications
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Arthritis, Experimental / drug therapy*
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Arthritis, Experimental / pathology
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Behavior, Animal / drug effects
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Carrageenan
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Edema / chemically induced
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Edema / drug therapy*
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Edema / pathology
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Excitatory Amino Acid Antagonists / therapeutic use*
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Hindlimb / pathology
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Hot Temperature
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Hyperalgesia / chemically induced
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Hyperalgesia / drug therapy*
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Hyperalgesia / etiology
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Injections, Spinal
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Male
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Microdialysis
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Pain Measurement / drug effects
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Rats
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Rats, Sprague-Dawley
Substances
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Excitatory Amino Acid Antagonists
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6-Cyano-7-nitroquinoxaline-2,3-dione
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Carrageenan