Anti-mycobacterial and immunomodulatory activity of n-hexane fraction and spathulenol from Ocotea notata leaves

Abstract Ocotea notata (Lauraceae) is popularly known as white-cinnamon. Ocotea species have several medicinal uses, especially for treating chest pain, rheumatism and wounds. The present study aimed to analyze the chemical composition of O. notata n-hexane fraction, in addition to its anti-mycobacterial and immunomodulatory activities. The n-hexane fraction was analyzed by GC-MS and was chromatographed to afford 15 subfractions (SF1-15), where SF5 was identified, by GC-MS and NMR, as the sesquiterpene spathulenol. The n-hexane fraction was the most potent in inhibiting nitric oxide (NO) and tumor necrosis factor-alpha (TNF-α) production on LPS-stimulated macrophages (IC50 8.3 ± 0.9 and 5.9 ±1.0 μg/mL, respectively). SF4, a major subfraction, that presents a spathulenol analogous as a constituent, also inhibited NO and TNF-α production. Spathulenol only modulated NO production (IC50 45.6 ± 1.4 μg/mL). The n-hexane fraction, SF4, and spathulenol revealed antimycobacterial activity against Mycobacterium bovis BCG, M. tuberculosis H37Rv, and M299 strains. Spathulenol inhibited the growth of Mtb H37Rv with MIC50 36.9 ± 1.5 μg/mL (167.5 ± 6.8 μM), and Mtb M299 with MIC5042.1 ± 0.5 μg/mL (191.0 ± 2.2 μM). This is the first report describing the isolation of spathulenol from O. notata leaves and its anti-mycobacterial activity.

Bibliographic Details

Main Authors:	Costa,Isabela Francisca de Jesus Borges, Simão,Thatiana Lopes Bia Ventura, Calixto,Sanderson Dias, Pereira,Rafaella Velloso, Konno,Tatiana Ungaretti Paleo, Pinto,Shaft Corrêa, Tinoco,Luzineide Wanderley, Lasunskaia,Elena, Leal,Ivana Correa Ramos, Muzitano,Michelle Frazão
Format:	Digital revista
Language:	English
Published:	Instituto de Pesquisas Jardim Botânico do Rio de Janeiro 2021
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2175-78602021000100236
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