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Background  The purpose of this study was to assess the antitumoral effect of the methanol extract (MeOH) from  Nitraria retusa  leaves and to investigate its immunomodulatory activity that mediated the prevention of tumor progression in tumor-bearing mice.    Methods  Balb/c mice weighing 18–20 g were subcutaneously implanted with B16-F10 cells then injected intra-peritoneally, 7 days later with (200 mg/kg bw) of MeOH extract, for 21 days. After euthanization on day 21, the tumors were weighed. Lymphocyte proliferation, cytotoxic T lymphocyte (CTL) and NK activity were evaluated using the MTT assay. Macrophage phagocytosis was studied by measuring their lysosomal activity and nitric oxide production.    Results  The methanol extract inhibited significantly the growth of the implanted tumor, and increased remarkably splenocyte proliferation as well as NK and CTL activities, in tumor-bearing mice. It also promoted lysosomal activity of treated animal macrophages.    Conclusion  Our findings suggest that antitumoral effect of MeOH extract is related with to immunomodulatory activity.

Antitumoral potency of methanolic extract from Nitraria retusa leaves via its immunomodulatory effect