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Antibacterial Activity of Aristolochia brevipes against Multidrug-Resistant Mycobacterium tuberculosis
Laboratory of Microbiology, Biomedical Research Center of the South (IMSS), Argentina 1, Col. Centro, 62790 Xochitepec, Morelos, Mexico
Immunochemistry Laboratory II, Department of Immunology, National School of Sciences Bilogy (IPN), Prolongación Carpio y Plan de Ayala S/N, Col. Casco de Santo Tomás, 11340 Mexico, D.F., Mexico
Chemical Research Center, University of Morelos (UAEM), Av. Universidad 1001, Col. Chamilpa, 62209 Cuernavaca, Morelos, Mexico
* Author to whom correspondence should be addressed.
Received: 20 July 2011; in revised form: 18 August 2011 / Accepted: 23 August 2011 / Published: 29 August 2011
Abstract: The increased incidence of Multidrug-Resistant Mycobacterium tuberculosis (MDR-MT) requires the search for alternative antimycobacterial drugs. The main aim of this study was to evaluate the dichloromethane extract from Aristolochia brevipes (Rhizoma) and the compounds isolated from this extract against several mycobacterial strains, sensitive, resistant (monoresistant), and clinical isolates (multidrug-resistant), using the alamarBlue™ microassay. The extract was fractionated by column chromatography, yielding the following eight major compounds: (1) 6α-7-dehydro-N-formylnornantenine; (2) E/Z-N-formylnornantenine; (3) 7,9-dimethoxytariacuripyrone; (4) 9-methoxy-tariacuripyrone; (5) aristololactam I; (6) β-sitosterol; (7) stigmasterol; and (8) 3-hydroxy-α-terpineol. The structures of these compounds were elucidated by 1H- and 13C- (1D and 2D) Nuclear Magnetic Resonance (NMR) spectroscopy. This study demonstrates that the dichloromethane extract (rhizome) of A. brevipes possesses strong in vitro antimycobacterial activity against Mycobacterium tuberculosis H37Rv (Minimum Inhibitory Concentration value [MIC], 12.5 µg/mL). The most active compound against all mycobacterial strains tested was the compound aristolactam I (5), with MIC values ranging between 12.5 and 25 µg/mL. To our knowledge, this the first report of antimycobacterial activity in this plant.
Keywords: Mycobacterium tuberculosis; Multidrug-resistant (MDR); Aristolochia brevipes; alamarBlue™ microassay; medicinal plant
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Navarro-García, V.M.; Luna-Herrera, J.; Rojas-Bribiesca, M.G.; Álvarez-Fitz, P.; Ríos, M.Y. Antibacterial Activity of Aristolochia brevipes against Multidrug-Resistant Mycobacterium tuberculosis. Molecules 2011, 16, 7357-7364.
Navarro-García VM, Luna-Herrera J, Rojas-Bribiesca MG, Álvarez-Fitz P, Ríos MY. Antibacterial Activity of Aristolochia brevipes against Multidrug-Resistant Mycobacterium tuberculosis. Molecules. 2011; 16(9):7357-7364.
Navarro-García, Víctor Manuel; Luna-Herrera, Julieta; Rojas-Bribiesca, Ma. Gabriela; Álvarez-Fitz, Patricia; Ríos, María Yolanda. 2011. "Antibacterial Activity of Aristolochia brevipes against Multidrug-Resistant Mycobacterium tuberculosis." Molecules 16, no. 9: 7357-7364.