Effect of DSS-induced colitis on visceral sensitivity to colorectal distension in mice: DSS-induced colitis and visceral sensitivity

Larsson, Marie,1972Gothenburg University,Göteborgs universitet,Institutionen för neurovetenskap och fysiologi, sektionen för fysiologi,Institute of Neuroscience and Physiology, Department of Physiology (författare)

Effect of DSS-induced colitis on visceral sensitivity to colorectal distension in mice : DSS-induced colitis and visceral sensitivity

The current study aimed at evaluating the effect of dextran sodium sulphate (DSS)-induced colitis on visceral sensitivity, measured as the visceromotor response (VMR) to colorectal distension (CRD) in Balb/c and C57Bl/6 male mice. Inflammation was induced by addition of 4% DSS to the drinking water for 5 (C57Bl/6) or 6-7 days (Balb/c). Parallel groups were used to monitor histopathological changes and visceral sensitivity. Pseudo-affective visceral pain responses were evoked using an increasing phasic CRD-paradigm (10-60 mmHg) in conscious mice on predetermined days (pre-treatment controls, 12, 16, 20, 30, 40 and 51). In both mouse strains, significant histopathological changes developed between days 2 and 5 of DSS treatment, and persisted until day 12 (p<0.05). On day 15, inflammatory scores were reduced by about 50%. Despite evidence of inflammation in DSS-treated mice, no differences could be shown in the VMR to CRD between DSS treated mice and controls at any time point tested. In addition, no differences were seen before and after DSS-treatment in the same group of mice. In conclusion, these data suggest that DSS-induced colonic inflammation does not affect the visceral sensitivity to CRD, neither at short or long term, in Balb/c or C57Bl/6 male mice.

Göteborgs universitetInstitutionen för neurovetenskap och fysiologi, sektionen för fysiologi (creator_code:org_t)

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