Abstract
The aim of this study was to evaluate the preventive and/or protective action of Mimosa
caesalpiniifolia (M. caesalpiniifolia) following experimental colitis in rats. The
rats were randomized into ten groups (n=10 per group), as follows: G1 – Sham group:;
G2 – TNBS group; G3, G4 –colitis and treated with hydroalcoholic extract of M. caesalpiniifolia
250 mg/kg/day after and before/after inducing colitis, respectively; G5, G6 – colitis
and treated with hydroalcoholic extract of M. caesalpiniifolia at 125 mg/kg/day after
and before/after inducing colitis respectively; G7,G8 – colitis and treated with ethylacetate
fraction of M. caesalpiniifolia at 50 mg/kg/day after and before/after inducing colitis,
respectively; G9,G10 – colitis and treated with ethylacetate fraction of M. caesalpiniifolia
at 50 mg/kg/day after and before/after inducing colitis, respectively. Rats treated
with hydroalcoholic extract of M. caesalpiniifolia for both doses showed lower tissue
damage in the distal colon. Ethylacetate fraction was effective at the highest dose
only when administrated after inducing colitis. A downregulation of COX-2 was detected
to rats suffering colitis and treated with M. caesalpiniifolia at high dose. On the
other hand, TNF-alpha immunoexpression decreased in groups treated with M. caesalpiniifolia
at low dose after inducing colitis. In summary, our results suggest that M. caesalpiniifolia
attenuated the lesions of the colon, reduced inflammation, and modulates the expression
of COX-2 and TNF-α during chronic colitis induced by TNBS when using for therapeutic
purposes on a dose-dependent manner.
Key words
inflammatory bowel disease - TNBS-colitis - mimosa - TNF-alpha - COX-2