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Abstract Title:

Oral administration of geraniol ameliorates acute experimental murine colitis by inhibiting pro-inflammatory cytokines and NF-κB signaling.

Abstract Source:

Food Funct. 2015 Sep ;6(9):2984-95. PMID: 26190278

Abstract Author(s):

Kanakaraju Medicherla, Bidya Dhar Sahu, Madhusudana Kuncha, Jerald Mahesh Kumar, Godi Sudhakar, Ramakrishna Sistla

Article Affiliation:

Kanakaraju Medicherla

Abstract:

Ulcerative colitis is associated with a considerable reduction in the quality of life of patients. The use of phyto-ingredients is becoming an increasingly attractive approach for the management of colitis. Geraniol is a monoterpene with anti-inflammatory and antioxidative properties. In this study, we investigated the therapeutic potential of geraniol as a complementary and alternative medicine against dextran sulphate sodium (DSS)-induced ulcerative colitis in mice. Disease activity indices (DAI) comprising body weight loss, presence of occult blood and stool consistency were assessed for evaluation of colitis symptoms. Intestinal damage was assessed by evaluating colon length and its histology. Pre-treatment with geraniol significantly reduced the DAI score, improved stool consistency (without occult blood) and increased the colon length. The amount of pro-inflammatory cytokines, specifically TNF-α, IL-1β and IL-6 and the activity of myeloperoxidase in colon tissue were significantly decreased in geraniol pre-treated mice. Western blot analyses revealed that geraniol interfered with NF-κB signaling by inhibiting NF-κB (p65)-DNA binding, and IκBα phosphorylation, degradation and subsequent increase in nuclear translocation. Moreover, the expressions of downstream target pro-inflammatory enzymes such as iNOS and COX-2 were significantly reduced by geraniol. Pre-treatment with geraniol also restored the DSS-induced decline in antioxidant parameters such as reduced glutathione and superoxide dismutase activity and attenuated the increase in lipid peroxidation marker, thiobarbituric acid reactive substances and nitrative stress marker, nitrites in colon tissue. Thus, our results suggest that geraniol is a potential therapeutic agent for inflammatory bowel disease.

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