Evaluation of Anti-asthmatic Activities of Ixora coccinea Linn (Rubiaceae)
Ixora coccinea L. (Rubiaceae) possess anti-inflammatory and antitussive properties. It is traditionally used for various respiratory ailments including catarrhal bronchitis cough and asthma. In the present study we investigated anti-asthmatic properties of an hydroalcoholic leaf extract of I. coccinea in an ovalbumin (OVA)-induced asthmatic rat model. We also evaluated the anti-allergic property of the extract by Abdominal Wall (AW) method and histamine-induced cutaneous reaction. Rats were sensitized with intraperitoneal (i.p.) ovalbumin and challenged by OVA intranasally to induce chronic airway inflammation. Randomized treatment groups of sensitized rats received I. coccinea extract or distilled water. I. coccinea extract at doses of 1000 and 1500 mg kg-1 suppressed eosinophilia and significantly inhibited AHR in rat with OVA-induced asthma. Based on lung histopathological study using hematoxylin and eosin I. coccinea reduced inflammatory cell infiltration and repaired epithelial cells damaged. In addition the extract at the same doses significantly decreased the diameter of the blue spot (16 and 55%, respectively) compared with the controls and inhibited the skin reactions induced by histamine (23.55 and 53.36%, respectively). In conclusion our results provide evidence that I. coccinea has anti-asthmatic properties and then can support its use in folk medicine to treat asthma.
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