Clastogenic, anti-clastogenic profile and safety assessment of Camel urine towards the development of new drug target.

Camel Urine (CU) is composed of components that have antitumor properties and other therapeutic benefits. Regardless of short-term preliminary CU genotoxicity is reported, comprehensive genotoxic studies are limited. In this study, sensitive in vitro and in vivo genotoxic bioassays such as mitotic index (MI), chromosomal aberrations (CA), micronucleated polychromatic erythrocytes (MPE), and analysis of primary spermatocytes were employed. The adventitious roots of Allium cepa L. and mice (Mus musculus), as an experimental mammalian system, were employed to assess the MI and CA of CU induced by sodium nitrate and cyclophosphamide respectively. In contrast, other clastogenic assays were studied in mice (Mus musculus). Twenty-eight days of four repeated doses (2.5, 5, 25, and 50 mL/kg BW) of CU were tested and compared with three doses (10, 25, and 50 mg/kg BW) cyclophosphamide as a positive control and deionized water as the negative control. The results proved that cytological examination of CU was cytotoxic since a decrease in mitotic activity (16.8-1.1) was observed, since the significant reduction in cell proliferation in A. cepa L. and also in mice bone marrow cells. On the other hand, CU did not induce a clastogenic effect since no significant stickiness, fragment, multinucleoli were observed compared to the control group. Additionally, the data showed that CU decreased the CA when mice had received cyclophosphamide (25 mg BW) followed by CU doses. CU was found to be cytotoxic but no clastogenic effect. Furthermore, it possesses anticlastogenic properties. The observed results suggest that CU in whole or the metabolites present in CU could be a potent drug target. Further research is warranted to study the complete metabolites profiling and to study the molecular mechanisms.

In vivo anticlastogenic effect of silymarin from milk thistle Silybum marianum L.

OBJECTIVE: Silymarin, extracted from the seeds of Silybum marianum L. (Milk thistle), is traditionally used for treating various illnesses such as diabetes, cancer, inflammation, hepatitis, liver cirrhosis, and renal problems. Acute cytotoxicity and genotoxicity studies have been reported with ambiguous outcomes; however, its relevant anticlastogenic potential is not yet evaluated. This study was aimed to evaluate in vivo subacute anticlastogenic properties of silymarin to validate its use as a medicinal agent. MATERIALS AND METHODS: Silymarin was isolated from seeds of milk thistle. Various genotoxicity bioassays of silymarin were performed using mice. First, the bone marrow cell proliferation was estimated by calculating mitotic index. Second, the chromosomal abnormalities in mice bone marrow cells were studied. Third, micronucleated polychromatic erythrocytes (MPE) test and in vivo activation of sister chromatid exchanges (SCEs) were carried out in mice bone marrow cells. Finally, primary spermatocytes were analyzed to estimate genotoxic effect of silymarin on germ cells. RESULTS: We found that silymarin is capable of inducing a significant increase (P ≤ 0.05) in cell proliferation of bone marrow cells. There is no increase in chromosomal aberrations following silymarin treatments. Results clearly showed that it significantly (P ≤ 0.05) decreased the MPE. Likewise, it was found to be a negative inducer of SCEs. It decreased in total abnormal metaphase, SCEs, MPE, and aberrant diakinesis. CONCLUSION: The results demonstrated that silymarin has a strong anticlastogenic activity upon mice genome in somatic and germ cells, indicating its safe use as a medicinal substance. Furthermore, it is not only safe but also has protective effect from clastogens.