Comparative Study of the Antibacterial and Cytotoxic Activity of Leaves, Trunk and Roots of Schumanniophyton Magnificum

Abstract

Aims: Schumanniophyton magnificum is a plant reputed traditionally to treat numerous urogenital infections linked to several germs, notably: Escherichia coli, Staphylococcus aureus, Neisseria gonhorhea, Treponema palidum, Candida albican. This study aims to evaluate and compare the in vitro antibacterial and cytotoxic activities of the leaves, trunk and roots of S. magnificum in order to determine the parts displaying the best activity. Study Design: This is an experimental study. Location and Duration of the Study: The work was conducted at the Pharmacochemistry and Natural Substances Laboratories of the Faculty of Medicine and Pharmaceutical Sciences, University of Douala for the extraction and at the Medical Analysis Laboratory of the Douala General Hospital for antibacterial test as well as Biomedical Chemistry Research Center of Rhodes University in South Africa for cytotoxic essay. All the experiments were carried out from the 15th November 2020 to the 31th May 2021. Methodology: The in vitro Antibacterial activity essay was conducted on two strains, one Gram+ bacteria: Staphylococcus aureus and one Gram- bacteria: Escherichia coli, while cytotoxicity was evaluated on HeLa cell line. Results: The root wood extract and the root bark extract presented a good antibacterial activity (MIC = 195.31 µg/mL) and average activity (MIC = 390.63 µg/mL) respectively with E. coli. The different extracts were found to be bactericidal against the tested micro-organisms. At the concentration of 20 µg/mL, all extracts tested did not significantly reduce HeLa cells, with an inhibition rate ranging from 13.5 to 37.6%, suggesting a low cytotoxicity of S. magnificum extracts towards these human cells line. Conclusion: This is the first comparative report on the antibacterial and cytotoxic study conducted on the different parts of S. magnificum. It appears from this study that these results could justify the use of the stem bark of S. magnificum in the traditional pharmacopeia for the treatment of urogenital infections. However, the roots wood having presented the best antibacterial activity (MIC = 195.31 µg/mL), it would be beneficial to suggest this plant part to the local populations for the treatment of bacterial diseases specific to E. coli and S. aureus, after the preclinical and clinical tests are carried out.