TY - JOUR
T1 - Hyperalgesia induced by altered glycinergic activity at the spinal cord
AU - Beyer, Carlos
AU - Roberts, Lowell A.
AU - Komisaruk, Barry R.
N1 - Funding Information:
Contribution No. 383 from the Institute of Animal Behavior. We thank Ms. Cynthia Banas for her outstanding technical assistance. This research was supported by National Science Foundation Grant BNS 8217702 (BRK).
PY - 1985/9/2
Y1 - 1985/9/2
N2 - Glycine or its receptor antagonist, strychnine, were administered perispinally to investigate their effect on nociceptive responses selicited by activation of various cutaneous receptors. Strychnine produced dose-dependent sensory and motor disturbances; 1 and 5 μg doses were sub-convulsive, eliciting recurrent episodes of coordinated grooming, scratching and biting at the skin, which persisted for approximately 10 minutes post-injection; higher doses (25 and 100 μg) increased the intensity and duration of these effects, and produced convulsive motor seizures. Motor disturbances were not elicited by glycine (5, 25, 100 and 400 μg). Strychnine treated rats, at all doses, vocalized consistently in response to light cutaneous stimulation; a significant proportion of glycine treated rats also vocalized, but were not as sensitive to mild stimulation. Skin hyperalgesia persisted for at least 30 minutes in both strychnine and glycine treated rats. Both strychnine and glycine significantly reduced vocalization thresholds to tail shock. However, no clear effect on tail flick latency was observed following either strychnine or glycine. These results indicate that glycinergic neurons contribute to the tonic regulation of nociceptive input at the spinal cord.
AB - Glycine or its receptor antagonist, strychnine, were administered perispinally to investigate their effect on nociceptive responses selicited by activation of various cutaneous receptors. Strychnine produced dose-dependent sensory and motor disturbances; 1 and 5 μg doses were sub-convulsive, eliciting recurrent episodes of coordinated grooming, scratching and biting at the skin, which persisted for approximately 10 minutes post-injection; higher doses (25 and 100 μg) increased the intensity and duration of these effects, and produced convulsive motor seizures. Motor disturbances were not elicited by glycine (5, 25, 100 and 400 μg). Strychnine treated rats, at all doses, vocalized consistently in response to light cutaneous stimulation; a significant proportion of glycine treated rats also vocalized, but were not as sensitive to mild stimulation. Skin hyperalgesia persisted for at least 30 minutes in both strychnine and glycine treated rats. Both strychnine and glycine significantly reduced vocalization thresholds to tail shock. However, no clear effect on tail flick latency was observed following either strychnine or glycine. These results indicate that glycinergic neurons contribute to the tonic regulation of nociceptive input at the spinal cord.
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U2 - 10.1016/0024-3205(85)90523-5
DO - 10.1016/0024-3205(85)90523-5
M3 - Article
C2 - 3839886
AN - SCOPUS:0022246192
VL - 37
SP - 875
EP - 882
JO - Life Sciences
JF - Life Sciences
SN - 0024-3205
IS - 9
ER -