Electrolytic lesion of the anterior cingulate cortex decreases inflammatory, but not neuropathic nociceptive behavior in rats

被引:79
作者
Donahue, RR [1 ]
LaGraize, SC [1 ]
Fuchs, PN [1 ]
机构
[1] Univ Texas, Dept Psychol, Arlington, TX 76019 USA
关键词
L5; ligation; tonic pain; limbic system; mechanical hyperalgesia; formalin test;
D O I
10.1016/S0006-8993(01)02103-5
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
The present study investigated the effect of lesions of the anterior cingulate cortex (ACC) on mechanical allodynia/hyperalgesia after L5 ligation or on inflammatory nociceptive responses following formalin injection in the rat. For both the neuropathic and inflammatory pain models, three groups of animals were used. The control groups consisted of a group of sham lesioned animals and a group of animals that had unilateral damage to the ACC or unilateral/bilateral damage to surrounding cortical tissue. The third group consisted of animals that had at least 75% bilateral damage of the ACC. Subjects received L5 ligation or a 0.05-ml injection of 1% formalin into the planter surface of the hindpaw. In contrast to the control soups, bilateral ACC lesions significantly decreased inflammatory nociceptive responses during the prolonged, tonic portion of the formalin test (20-35 min). The difference between the groups was most prevalent in the amount of time spent licking the paw. However, ACC lesions did not significantly attenuate the enhanced mechanical paw withdrawal threshold in the neuropathic nociceptive model. These results suggest a differential role of the ACC in the modulation of different types of pain conditions. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:131 / 138
页数:8
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