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Anti-tuberculosis neolignans from Piper regnellii
R B L Scodro1, C T A Pires, V S Carrara
1Postgraduate Program in Pharmaceutical Sciences, State University of Maringá, Maringá, Paraná, Brazil.
Summary
Neolignans from Piper regnellii show promising anti-tuberculosis activity. Eupomatenoid-5 (1) demonstrated significant efficacy against Mycobacterium tuberculosis, making it a potential candidate for new drug development.
Area of Science:
- Natural Product Chemistry
- Medicinal Chemistry
- Microbiology
Background:
- Tuberculosis remains a significant global health challenge, necessitating the discovery of novel therapeutic agents.
- Natural products, particularly from plant sources like Piper regnellii, are a rich source of bioactive compounds.
- Neolignans are a class of phenolic compounds with diverse biological activities.
Purpose of the Study:
- To investigate the anti-Mycobacterium tuberculosis (M. tuberculosis) activities of supercritical CO2 extracts and specific neolignans from Piper regnellii.
- To evaluate the cytotoxicities of these compounds in macrophage cell lines.
- To identify potential new drug leads for tuberculosis treatment.
Main Methods:
- Supercritical CO2 extraction of Piper regnellii leaves and stems.
- Isolation and structural elucidation of neolignans (eupomatenoid-5, conocarpan, eupomatenoid-3) using chromatographic methods and NMR spectroscopy.
- Antimicrobial activity assessed via resazurin microtiter assay (REMA) to determine minimum inhibitory concentrations (MIC) against M. tuberculosis strains.
- Cytotoxicity evaluated using sulforhodamine B colorimetric assay in J774G.8 macrophages.
Main Results:
- Supercritical CO2 extracts from leaves and stems, and conocarpan (4) exhibited anti-M. tuberculosis activity with an MIC of 15.6 μg/ml.
- Eupomatenoid-5 (1) displayed the most potent activity against M. tuberculosis, with an MIC of 1.9 μg/ml and a favorable selectivity index (SI).
- Eupomatenoid-3 (7) and derivative compounds showed limited or no significant anti-M. tuberculosis activity.
Conclusions:
- This study is the first to report the anti-M. tuberculosis activity of neolignans isolated from Piper regnellii.
- Eupomatenoid-5 (1) is identified as a promising candidate for further development as an antituberculosis therapeutic agent.
- Further research is warranted to explore the mechanism of action and optimize the efficacy of eupomatenoid-5.
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