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Am J Physiol Gastrointest Liver Physiol 284: G434-G444, 2003. First published November 20, 2002; doi:10.1152/ajpgi.00324.2002
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Vol. 284, Issue 3, G434-G444, March 2003

Quantitative assessment and characterization of visceral nociception and hyperalgesia in mice

Elizabeth H. Kamp, R. Carter W. Jones III, Shelly R. Tillman, and G. F. Gebhart

University of Iowa, College of Medicine, Department of Pharmacology, Iowa City, Iowa 52242

Colorectal distension (CRD) is a well-characterized model of visceral nociception, which we adapted to the mouse. CRD reproducibly evoked contractions of the abdominal musculature [visceromotor response (VMR)], which was graded to stimulus intensity. The magnitude of VMR was greater in male C57BL6 and female 129S6 mice than in male 129S6 and B6.129 mice. In 129S6, C57BL6, and B6.129 mice strains, VMR was reduced dose dependently by morphine (1-10 mg/kg) and by the kappa -opioid agonist U-69593 (0.2-2 mg/kg), although U-69593 was significantly less potent in C57BL6 mice. In additional experiments, the VMR was recorded from adult male 129S6 mice before and after intracolonic administration of various irritants. Only 30% ethanol significantly enhanced responses to CRD. The colon hyperalgesia persisted for 14 days and was associated with a significant shift of the morphine dose-response function to the left. We believe this will be a useful model for study of visceral nociception and hyperalgesia, including studies of transgenic mice with mutations relevant to pain.

colon; visceral pain; knockout mice; strain; gender; kappa -opioid


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