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Background  The vast majority of the population around the world has always used medicinal plants as first source of health care to fight infectious and non infectious diseases. Most of these medicinal plants may have scientific evidence to be considered in general practice.    Objective  The aim of this work was to investigate the antioxidant capacities and anti-inflammatory activities of ethanol extracts of leaves of  Cassia alata, Eleusine indica, Carica papaya, Eremomastax speciosa  and the stem bark of  Polyscias fulva , collected in Cameroon.    Methods  Chemiluminescence was used to analyze the antioxidant activities of plant extracts against hydrogen peroxide or superoxide anion. Comet assays were used to analyze the protection against antioxidant-induced DNA damage induced in white blood cells after treating with hydrogen peroxide. Flow cytometry was used to measure γδ T cells proliferation and anti-inflammatory activity of γδ T cells and of immature dendritic cells (imDC) in the presence of different concentrations of plant extracts.    Results  Ethanol extracts showed strong antioxidant properties against both hydrogen peroxide and superoxide anion.  Cassia alata  showed the highest antioxidant activity. The effect of plant extracts on γδ T cells and imDC was evidenced by the dose dependent reduction in TNF-α production in the presence of  Cassia alata ,  Carica papaya, Eremomastax speciosa Eleusine indica,  and  Polyscias fulva . γδ T cells proliferation was affected to the greatest extent by  Polyscias fulva .    Conclusion  These results clearly show the antioxidant capacity and anti-inflammatory activities of plant extracts collected in Cameroon. These properties of leaves and stem bark extracts may contribute to the value for these plants in traditional medicine and in general medical practice.

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Antioxidant and Anti-Inflammatory Activities of Extracts from Cassia alata, Eleusine indica, Eremomastax speciosa, Carica papaya and Polyscias fulva Medicinal Plants Collected in Cameroon