Potential Antiproliferative Activity and Evaluation of Essential Oil Composition of the Aerial Parts of Tamarix aphylla (L.) H.Karst.: A Wild Grown Medicinal Plant in Jordan

Essential (volatile) oil from aerial parts of Tamarix aphylla (L.) H.Karst. (Tamaricaceae) grown wild in Jordan was hydrodistilled by Clevenger apparatus and analyzed by means of GC and GC-MS techniques. In vitro screening of potential cytotoxicity of the aqueous (AE) and ethanol (EE) extracts was also evaluated against human breast adenocarcinoma (MCF-7), colorectal adenocarcinoma (Caco-2), and pancreatic carcinoma (Panc-1) cancer cell lines as well as normal human fibroblasts. GC-MS analysis of T. aphylla EO revealed its richness in nonterpenoid nonaromatic hydrocarbons (52.39%), with predominance of 6,10,14-trimethyl-2-pentadecanone as the principal component. Biologically, the plant extracts exhibited cytotoxicity effects in dose-dependent manner against most of the tested cell lines, but potent effects were only predicted against MCF-7 cells with IC50 values of 2.17 ± 0.10 and 26.65 ± 3.09 μg/mL for T. aphylla AE and EE, respectively. T. aphylla AE demonstrated a comparable cytotoxic effect with that offered by the control drug cisplatin (IC50 value of 1.17 ± 0.13 μg/mL), even with higher safety profile against normal fibroblast cells (IC50 values of T. aphylla AE versus cisplatin: 79.99 ± 4.90 versus 9.08 ± 0.29 μg/mL). T. aphylla extracts could be a valuable source for cytotoxic agents with high safety and selective cytotoxicity profiles. Unfortunately, no antiproliferative potential against Caco-2 or Panc-1 cancer cell lines was detected at a concentration less than 30 μg/mL.

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