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Combination Activity of Standard Antituberculosis Drugs and Extracts of Medicinal Plants Commonly Used in Traditional Treatment of Tuberculosis in Uganda

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Advances in Infectious Diseases 2024年第3期14卷 511-522页

作者： Moses Mpeirwe Kevin Komakech Duncan Ssesazi patrick engeu ogwang Joel Bazira Department of Microbiology Mbarara University of Science and Technology Mbarara Uganda Department of Medical Microbiology Mycobacteriology (BSL-3) Laboratory Makerere University Kampala Uganda Department of Pharmaceutical Sciences Mbarara University of Science and Technology Mbarara Uganda Department of Pharmacy Mbarara University of Science and Technology Mbarara Uganda

Introduction: Resistance to antituberculosis drugs and adverse drug reactions remain the leading causes of tuberculosis therapeutic failure globally. Despite the increasing acceptance of medicinal plant use in combination with conventional antituberculosis drugs in treatment of tuberculosis (TB) in Uganda, there is paucity of knowledge on their combination effect. Aim: This research aimed to determine combination activity of standard antituberculosis drugs with extracts of Zanthoxylum leprieurii Guill. & Perr. and Rubia cordifolia L., the two common antituberculosis medicinal plants in Uganda, against pansensitive (H37Rv) and multi-drug resistant (MDR) Mycobacterium tuberculosis strains. Materials and Methods: Two reference MTB strains (H37Rv and MDR strain) were inoculated on Middlebrook 7H11 medium containing a combination of standard antituberculosis drugs and methanol extracts of Z. leprieurii and R. cordifolia at varying concentrations. The number of colonies on the plates was observed and counted weekly for up to 8 weeks. In vitro combination activity was determined using proportion method. Mean percentage inhibition was calculated for the reduction of number of colonies on drug-extract combination medium in relation to drug-extract-free control medium. Results: Drug-extract combinations showed good combination activity against Mycobacterium tuberculosis strains when compared with individual standard anti-TB drugs. This was more exhibited against MDR strain. There was however a reduction in percentage inhibition when extracts were combined with ethambutol and streptomycin against H37Rv strain. Conclusions: Zanthoxylum leprieurii and Rubia cordifolia in combination with standard anti-TB drugs exhibited increased in vitro activity against Mycobacterium tuberculosis, especially MDR-TB strain. This justifies the local use of these plants in traditional treatment of tuberculosis especially in resistant cases in Uganda.

关键词： Combination Activity Medicinal Plants Zanthoxylum leprieurii Rubia cordifolia Standard Antituberculosis Drugs

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Anti-Mycobacterial Activity of Medicinal Plant Extracts Used in the Treatment of Tuberculosis by Traditional Medicine Practitioners in Uganda

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Pharmacology & Pharmacy 2023年第2期14卷 33-42页

作者： Moses Mpeirwe Ivan Mugisha Taremwa patrick Orikiriza patrick engeu ogwang Duncan Ssesazi Joel Bazira Department of Microbiology Mbarara University of Science and Technology Mbarara Uganda Institute of Allied Health Sciences Clarke International University Kampala Uganda Department of Microbiology Division of Basic Medical Sciences University of Global Health Equity Kigali Rwanda Department of Pharmacy Mbarara University of Science and Technology Mbarara Uganda Department of Pharmaceutical Sciences Mbarara University of Science and Technology Mbarara Uganda

Tuberculosis (TB) remains a public health challenge and one of the leading causes of death worldwide. TB is preventable and curable. However, treatment of tuberculosis has continued to be difficult as a result of rapid increase of multidrug and extensively drug resistant strains of Mycobacterium tuberculosis. Medicinal plants have for centuries been traditionally used in treatment of tuberculosis and similar ailments. They possess antimicrobial properties which render them a new hope as a source of novel bioactive leads in the development of antimycobacterial agents. In this study, 2 plant species commonly used traditionally in Uganda for treatment of tuberculosis, Zanthoxylum leprieurii and Rubia cordifolia were screened for in vitro antimycobacterial activity against Mycobacterium tuberculosis strains;pan sensitive MTB H37Rv, Rifampicin resistant TMC 331 strain and two wild strains (one rifampicin resistant and another one rifampicin susceptible). Antimycobacterial activity of aqueous, ethanolic and methanolic plant extracts was determined using Resazurin Microtiter Assay (REMA). Both plant extracts exhibited significant in vitro antimycobacterial activity against all strains of Mycobacterium tuberculosis. Minimum inhibitory concentrations (MIC) of methanolic crude extracts of both plants ranged from 23.4 μg/mL to 187.5 μg/mL. Comparatively, methanol extracts of both plants possessed superior antimycobacterial activity against all Mycobacterium tuberculosis strains. Our findings indicated that both plants exhibited activity against susceptible and resistant strains of Mycobacterium tuberculosis. While antimycobacterial activity of Z. leprieurii confirms results from previous studies, activity of the extracts of R. cordifolia is reported for the first time in East Africa. Further studies aimed at determining the effects of combination of these plant extracts and standard anti-TB drugs should be carried out.

关键词： Tuberculosis Antimycobacterial Activity Medicinal Plants Zanthoxylum leprieurii Rubia cordifolia

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Dried-leaf Artemisia annua: A practical malaria therapeutic for developing countries?

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World Journal of Pharmacology 2014年第4期3卷 39-55页

作者： Pamela J Weathers Melissa Towler Ahmed Hassanali Pierre Lutgen patrick ogwang engeu Department of Biologyand Biotechnology Worcester Polytechnic Institute Worcester MA 01609 United States School of Pure and Applied Sciences Kenyatta University IFBV-BELHERB PO Box 98 L-6908 Nieder-anven Luxembourg Natural Chemotherapeutics Research Institute Ministry of Health PO Box 4864 Kampala Uganda

Artemisinin from the plant Artemisia annua （A. annua） L., and used as artemisinin combination therapy （ACT）, is the current best therapeutic for treating malaria, a disease that hits children and adults especially in developing countries. Traditionally, A. annua was used by the Chinese as a tea to treat “fever”. More recently, investiga-tors have shown that tea infusions and oral consumption of the dried leaves of the plant have prophylactic and therapeutic effcacy. The presence of a complex matrix of chemicals within the leaves seems to enhance both the bioavailability and effcacy of artemisinin. Although about 1000-fold less potent than artemisinin in their antiplasmodial activity, these plant chemicals are mainly small molecules that include other artemisinic compounds, terpenes （mainly mono and sesqui）, favonoids, and polyphenolic acids. In addition, polysaccharide constituents of A. an-nua may enhance bioavailability of artemisinin. Rodent pharmacokinetics showed longer T？ and Tmax and greater Cmax and AUC in Plasmodium chabaudi -infected mice treated with A. annua dried leaves than in healthy mice. Pharmacokinetics of deoxyartemisinin, a liver metabolite of artemisinin, was more inhibited in infected than in healthy mice. In healthy mice, artemisinin serum levels were 〉 40-fold greater in dried leaf fed mice than those fed with pure artemisinin. Human trial data showed that when delivered as dried leaves, 40-fold less artemisinin was required to obtain a therapeutic response compared to pure artemisinin. ACTs are still unaffordable for many malaria patients, and cost estimates for A. annua dried leaf tablet production are orders of magnitude less than for ACT, despite improvements in the production capacity. Considering that for 〉 2000 years this plant was used in traditional Chinese medicine for treatment of fever with no apparent appearance of artemisinin drug resistance, the evidence argues for inclusion of affordable A. annua dried leaf tablets into the a

关键词： Malaria Infectious disease Artemisia annua Artemisinin Combination therapy Artemisinin combination therapy

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Pharmacognostic and phytochemical studies as an invaluable approach for correct identification of medicinal plants:The case of Artemisia vulgaris *** for Artemisia annua *** Western Uganda

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TMR Integrative Medicine 2023年第4期7卷 1-13页

作者： Ivan Kahwa Clement Olusoji Ajayi Reenu Yadav Nagendra Singh Chauhan Kamal Shah Abdelgadir Alamin Abdelgadir Efrata Ashuro Shegena Salome Daniel Timothy Omara John Baptist Asiimwe Hilda Ikiriza Shabnoor Iqbal Casim Umba Tolo Anke Weisheit patrick engeu ogwang Pharm-BioTechnology and Traditional Medicine Centre Mbarara University of Science and TechnologyP.O.Box 1410MbararaUganda Department of Pharmacy Faculty of MedicineMbarara University of Science and TechnologyP.O.Box 1410MbararaUganda Department of Pharmacy IES UniversityBhopal-462044Madhya PradeshIndia Drugs Testing Laboratory Avam Anusandhan Kendra Raipur(CG)492010India Institute of Pharmaceutical Research GLA UniversityMathuraUttar Pradesh 281406India Department of Pharmacognosy Faculty of PharmacyUniversity of GeziraP.O Box 20Wad MadaniSudan Department of Pharmaceutics and Pharmacy Practice Kampala International UniversityP.O.Box 9790Dares SalaamTanzania Institute of Chemistry of Renewable Resources Department of ChemistryUniversity of Natural Resources and Life Sciences Vienna(BOKU)Konrad-Lorenz-Straße 243430Tulln an der DonauAustria Aga Khan University P.O.Box 8842KampalaUganda Department of Biology Mbarara University of Science and TechnologyP.O.Box 1410MbararaUganda Department of Zoology Government College UniversityFaisalabadPunjab 38000Pakistan

Background:Different parts of Artemisia vulgaris L.(***)are ethno-medicinally used as an emmenagogue and for the treatment of ailments such as malaria fever,ulcers,and ***,anecdotal evidence shows that the plant is often substituted for Artemisia annua L.(***)by herbalists in Western Uganda due to similarities in their *** of medicinal plants and mislabelling of herbal products have been incriminated in toxicity and adverse health outcomes in traditional medicine *** safety continues to be a major issue with the use of herbal remedies,it becomes imperative therefore that medicinal plants should be correctly ***:This study focused on investigating the macroscopic,microscopic,physicochemical characteristics and phytochemical composition of *** leaves compared to *** to ease its correct ***:The results showed that there are some colour differences between the leaves of the two species,with a close arrangement of microscopic features but different leaf *** leaves of the two Artemisia species had similar tastes,but their shapes and colours(greenish-yellow for *** and dark green for ***)can be used by the local community to distinguish between *** artemisinin content was higher in *** leaves(1.72%)than in ***(1.43%),but the reverse was observed for the total flavonoid ***:This observation could justify the change in the use of *** by the indigenous community in western *** studies should consider the pharmacognostic comparison of *** with other species in the genus Artemisia and the use of molecular techniques such as DNA barcoding.

关键词： Artemisinin traditional medicine misidentification microscopic studies

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