Anti-Mycobacterium tuberculosis activity of essential oil and 6,7-dehydroroyleanone isolated from leaves of Tetradenia riparia (Hochst.) Codd (Lamiaceae).

Abstract

BACKGROUND:

The global resurgence of tuberculosis (TB) and the development of drug resistance, as multidrug-resistant (MDR) and extensively drug-resistant (XDR) Mycobacterium tuberculosis isolates, are a threat to TB control and have created a need for new and more effective anti-TB drugs.

AIM:

The current study evaluated the in vitro cytotoxicity and activity of Tetradenia riparia essential oil (TrEO) and 6,7-dehydroroyleanone pure compound against M. tuberculosis H37Rv and susceptible and resistant clinical isolates.

METHODS:

The in vitro activities of TrEO and 6,7-dehydroroyleanone were determined by Resazurin Microtiter Assay Plate (REMA). The cytotoxicity was evaluated in murine peritoneal macrophages by Alamar Blue assay. The cytotoxic effects were expressed as median concentration cytotoxicity (CC50) and the selectivity index (SI) was calculated.

RESULTS:

TrEO and 6,7-dehydroroyleanone showed activity against M. tuberculosis H37Rv with minimum inhibitory concentration (MIC) 62.5 µg/ml and 31.2 µg/ml, respectively. Both of them exhibited activities against resistant and susceptible M. tuberculosis clinical isolates with MIC values between 31.2 and 62.5 µg/ml. Cytotoxicity assays showed SI 1.9 and 7.9 for TrEO and 6,7-dehydroroyleanone, respectively.

CONCLUSION:

These results revealed that TrEO isolated from leaves of T. riparia and the pure compound 6,7-dehydroroyleanone display good activity against M. tuberculosis clinical isolates, including MDR isolates, with low cytotoxicity to murine macrophages. The 6,7-dehydroroyleanone compound is a potential candidate for anti-TB drug.

• Authors: Vanessa Pietrowski Baldin, Regiane Bertin de Lima Scodro, Mariana Aparecida Lopes-Ortiz, Aryadne Larissa de Almeida, Zilda Cristiani Gazim, Letícia Ferarrese, Viviane Dos Santos Faiões, Eduardo Caio Torres-Santos, Claudia Terencio Agostinho Pires, Katiany Rizzieri Caleffi-Ferracioli, Vera Lucia Dias Siqueira, Diógenes Aparício Garcia Cortez, Rosilene Fressatti Cardoso
• Journal: Phytomedicine : international journal of phytotherapy and phytopharmacology (Phytomedicine) Vol. 47 Pg. 34-39 (Aug 01 2018) ISSN: 1618-095X [Electronic] Germany
• PMID: 30166106 (Publication Type: Journal Article)
• Copyright: Copyright © 2018. Published by Elsevier GmbH.

Chemical References

• Abietanes
• Antitubercular Agents
• Oils, Volatile
• Plant Extracts
• Plant Oils
• 6,7-dehydroroyleanone

Topics

• Abietanes (pharmacology)
• Animals
• Antitubercular Agents (pharmacology)
• Cells, Cultured
• Lamiaceae (chemistry)
• Macrophages, Peritoneal (drug effects)
• Mice
• Microbial Sensitivity Tests
• Mycobacterium tuberculosis (drug effects)
• Oils, Volatile (pharmacology)
• Plant Extracts (pharmacology)
• Plant Leaves (chemistry)
• Plant Oils (pharmacology)