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Cytotoxicity and chromosomal aberrations induced by methanolic extract of Cuscuta reflexa and its pure compounds on meristematic cells of Allium species.
Pakistan Journal of Pharmaceutical Sciences 2017 March
Cuscuta reflexa (Convolvulaceae), is commonly known as amarbel or akashbel. In Bangladesh and Nepal some of the tribes use C. reflexa against edema, body ache, cancer, skin infections and liver disorders. Despite its traditional uses there is no information regarding genotoxic effects of either the plant extract or its pure compounds. Methanolic extract of C. reflexa (MECR) and pure compounds derived from it namely, odoroside H, neritaloside, and strospeside, were evaluated in Allium cepa L. and A. sativum L. for their effects on root growth, root apical meristem mitotic index (MI) , and chromosomal aberrations (CAs). In this study, we adopted a new method of calculating percent change in root length. MECR caused a concentration- and time- dependent inhibition in root length at 100 - 10000μg/ml in A. cepa root. It was accompanied by a subsequent decline in MI which is an indicative of its cytotoxic effect. On the contrary, at low concentrations a significant rise in root length was noticeable. In A. sativum, MECR also reduced the root length having IC50 values ~8 x and 4.3 x lower than A. cepa. A variety of CAs were evident in both Allium systems after treatment with MECR, odoroside H and neritaloside. Thus in MECR, cardenolides glycosides, i.e. odoroside H and neritaloside could be accountable for its genotoxicity.
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