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Journal of Integrative Medicine: Volume 16, 2018   Issue 1,  Pages: 62-70

DOI: 10.1016/j.joim.2017.12.009
Research Article
Anti-inflammatory and bronchodilatory constituents of leaf extracts of Anacardium occidentale L. in animal models
1. Oluwakemi Josephine Awakan (Department of Biological Sciences, College of Science and Engineering, Landmark University, PMB 1001, Omu-Aran, Nigeria )
2. Sylvia Omonirume Malomo (Department of Biochemistry, Faculty of Life Sciences, University of Ilorin, PMB 1515, Ilorin, Nigeria )
3. Abdullahi Adeyinka Adejare (Department of Physiology, Faculty of Basic Medical Sciences, College of Medicine of the University of Lagos, PMB 1203, Lagos, Nigeria )
4. Adedoyin Igunnu (Department of Biochemistry, Faculty of Life Sciences, University of Ilorin, PMB 1515, Ilorin, Nigeria )
5. Abiodun Humphrey Adebayo (Department of Biochemistry, College of Science and Technology, Covenant University, PMB 1023, Ota, Nigeria )
6. Bamidele Victor Owoyele (Department of Physiology, Faculty of Basic Medical Sciences, College of Health Sciences, University of Ilorin, PMB 1515, Ilorin, Nigeria )

ABSTRACT
OBJECTIVE: Anacardium occidentale L. leaf is useful in the treatment of inflammation and asthma, but the bioactive constituents responsible for these activities have not been characterized. Therefore, this study was aimed at identifying the bioactive constituent(s) of A. occidentale ethanolic leaf extract (AOEL) and its solvent-soluble portions, and evaluating their effects on histamine-induced paw edema and bronchoconstriction.
METHODS: The bronchodilatory effect was determined by measuring the percentage protection provided by plant extracts in the histamine-induced bronchoconstriction model in guinea pigs. The anti-inflammatory effect of the extracts on histamine-induced paw edema in rats was determined by measuring the increase in paw diameter, after which the percent edema inhibition was calculated. The extracts were analyzed using gas chromatography-mass spectrometry to identify the bioactive constituents. Column chromatography and Fourier transform infrared spectroscopy were used respectively to isolate and characterize the constituents. The bronchodilatory and anti-inflammatory activities of the isolated bioactive constituent were evaluated.
RESULTS: Histamine induced bronchoconstriction in the guinea pigs and edema in the rat paw. AOEL, hexane-soluble portion of AOEL, ethyl acetate-soluble portion of AOEL, and chloroform-soluble portion of AOEL significantly increased bronchodilatory and anti-inflammatory activities (P < 0.05). Oleamide (9-octadecenamide) was identified as the most abundant compound in the extracts and was isolated. Oleamide significantly increased bronchodilatory and anti-inflammatory activities by 32.97% and 98.41%, respectively (P < 0.05).
CONCLUSION: These results indicate that oleamide is one of the bioactive constituents responsible for the bronchodilatory and anti-inflammatory activity of A. occidentale leaf, and can therefore be employed in the management of bronchoconstriction and inflammation.
 

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Please cite this article as:
Oluwakemi Josephine Awakan, Sylvia Omonirume Malomo, Abdullahi Adeyinka Adejare, Adedoyin Igunnu, Abiodun Humphrey Adebayo, Bamidele Victor Owoyele. Anti-inflammatory and bronchodilatory constituents of leaf extracts of Anacardium occidentale L. in animal models. J Integr Med. 2018; 16(1): 62-70.
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