Anti-allergy and anti-tussive activity of Clitoria ternatea L. in experimental animals

J Ethnopharmacol. 2018 Oct 5;224:15-26. doi: 10.1016/j.jep.2018.05.026. Epub 2018 May 19.

Abstract

Ethnopharmacological relevance: Clitoria ternatea flower is traditionally used in the treatment of respiratory disorders including bronchitis and is one of the ingredients in different Ayurvedic preparations that are used in respiratory disorders. However, till date there is no scientific report on the anti-asthmatic activity of this flower.

Aim of the study: Ethanolic extract of Clitoria ternatea flowers (ECT) was evaluated for its anti-allergy and anti-tussive potential in experimental animals. Additionally, the anti-inflammatory potential of ECT was carried out to draw a plausible mechanism of action of the drug.

Materials and methods: In-vitro anti-asthmatic activity of ECT was evaluated in goat tracheal chain and isolated guinea pig ileum preparations. Acute and chronic anti-asthmatic activity of ECT (100, 200 and 400 mg/kg; p.o.) was estimated in histamine aerosol exposed guinea pigs and in OVA sensitized and challenged mice respectively. Anti-tussive activity of ECT (100, 200 and 400 mg/kg; p.o.) was evaluated against sulfur dioxide- and citric acid-induced cough in experimental animals. Moreover, the anti-inflammatory activity of ECT (100, 200 and 400 mg/kg; p.o.) was evaluated against carrageenan- and acetic acid-induced inflammation in rats.

Results: ECT attenuated histamine-induced contraction in both goat tracheal chain and isolated guinea pig ileum preparations. ECT (400 mg/kg) attenuated histamine-induced dyspnoea and OVA-induced changes in differential cell count in broncheoalveolar fluid, levels of interleukins (IL-1beta and IL-6) and immunoglobulin (OVA-sensitive IgG1) in animals. ECT (400 mg/kg) further ameliorated sulfur dioxide- and citric acid-induced cough in experimental animals. Additionally, ECT (400 mg/kg) attenuated inflammation in carrageenan and acetic acid challenged rodents.

Conclusions: Standardized ECT could be considered as a potential therapeutic alternative in the management of allergy-induced asthma.

Keywords: Allergy; Asthma; Clitoria ternatea; Immunoglobulin; Interleukin.

MeSH terms

  • Animals
  • Anti-Allergic Agents / analysis
  • Anti-Allergic Agents / pharmacology
  • Anti-Allergic Agents / therapeutic use*
  • Anti-Inflammatory Agents / analysis
  • Anti-Inflammatory Agents / pharmacology
  • Anti-Inflammatory Agents / therapeutic use*
  • Antitussive Agents / analysis
  • Antitussive Agents / pharmacology
  • Antitussive Agents / therapeutic use*
  • Asthma / blood
  • Asthma / drug therapy
  • Asthma / immunology
  • Asthma / pathology
  • Bronchoalveolar Lavage Fluid / cytology
  • Bronchoalveolar Lavage Fluid / immunology
  • Clitoria*
  • Dyspnea / drug therapy
  • Edema / chemically induced
  • Edema / drug therapy
  • Flowers
  • Goats
  • Granuloma / drug therapy
  • Guinea Pigs
  • Ileum / drug effects
  • Ileum / physiology
  • Immunoglobulin E / blood
  • Immunoglobulin E / immunology
  • Immunoglobulin G / blood
  • Immunoglobulin G / immunology
  • Lung / drug effects
  • Lung / immunology
  • Lung / pathology
  • Male
  • Mice
  • Phytochemicals / analysis
  • Phytochemicals / pharmacology
  • Phytochemicals / therapeutic use
  • Phytotherapy
  • Plant Extracts / analysis
  • Plant Extracts / pharmacology
  • Plant Extracts / therapeutic use*
  • Rats
  • Trachea / drug effects
  • Trachea / physiology

Substances

  • Anti-Allergic Agents
  • Anti-Inflammatory Agents
  • Antitussive Agents
  • Immunoglobulin G
  • Phytochemicals
  • Plant Extracts
  • Immunoglobulin E