Publicado

2017-01-01

Dolabellane diterpenes from the Caribbean soft corals Eunicea laciniata and Eunicea asperula and determination of their anti HSV-1 activity

Dolabellanos de los octocorales caribeños Eunicea laciniata y Eunicea asperula y determinación de su actividad anti VHS-1

Palabras clave:

Soft corals, Eunicea, dolabellane diterpenes, antivirals (en)
octocorales, Eunicea, dolabellanos, antivirales (es)

Autores/as

  • Fabián Amaya García Universidad Nacional de Colombia, Departamento de Química
  • Maria Leonisa Sanchez Nuñez Universidade Federal Fluminense, Instituto de Biologia
  • Freddy A. Ramos Universidad Nacional de Colombia, Departamento de Química
  • Mónica Puyana Universidad de Bogotá Jorge Tadeo Lozano, Departamento de Ciencias Biológicas y Ambientales
  • Izabel Christina Nunes de Palmer Paixão Universidade Federal Fluminense, Instituto de Biologia, Departamento de Biologia Celular e Molecular
  • Valeria Laneuville Teixeira Universidade Federal Fluminense, Departamento de Biologia Marinha, Departamento de Biologia Celular e Molecular
  • Leonardo Castellanos Universidad Nacional de Colombia, Departamento de Química
Dolabellane diterpenes have considerable antiviral activity, most studies have been focused towards compounds isolated from Dictyota brown algae. Although soft corals are also a significant source of these diterpenes, their antiviral potential has not been studied in detail. With the aim of assessing the biological activity of marine sources, we evaluated the dolabellane content in the soft corals Eunicea laciniata and E. asperula collected in Santa Marta, Colombian Caribbean. Dolabellanes 1-6 were isolated from E. laciniata while compounds 2, 4 and 5 were isolated from E. asperula. All compounds were identified by NMR, GC-EIMS, optical rotation and comparison with previously reported dolabellanes. GC-EIMS analyses showed that dolabellatrienone (2) transforms into compounds 4 and 5 as oxidation products upon prolonged storage; however, those compounds were also naturally present in the extract of the studied organisms. Pure dolabellanes were tested in vitro in antiviral assays against HSV-1. Compound 6 inhibited virus replication in infected cells (73.7% of inhibition at 50 μM) without cytotoxic effect (CC50 = 959), showing similar activity to the positive control Acyclovir®. Thus, compound 6 is an interesting candidate for further studies of dolabellanes as antivirals.

Los dolabellanos son diterpenos con importante actividad antiviral, la mayor parte de los estudios se han realizado con compuestos aislados de algas pardas del género Dictyota. Los corales blandos son también una importante fuente de dolabellanos, pero el potencial antiviral de éstos ha sido muy poco estudiado. Como parte de nuestra búsqueda de compuestos bioactivos a partir de fuentes marinas, se llevó a cabo el estudio químico de los dolabellanos presentes en los octocorales Eunicea laciniata y Eunicea asperula, recolectados en Santa Marta, Caribe colombiano. Los dolabellanos 1-6 fueron aislados del octocoral E. laciniata mientras que en E. asperula se encontraron los compuestos 2, 4 y 5. La elucidación estructural se llevó a cabo mediante experimentos de RMN, espectrometría de masas, rotación óptica y posterior comparación con reportes previos en la literatura. El análisis por CG-EM evidenció que la dolabellatrienona (2) se puede transformar en los compuestos 4 y 5 como producto del almacenamiento prolongado, no obstante, tales compuestos también estuvieron presentes en los extractos de los organismos estudiados. El compuesto 6 inhibió la replicación del VHS-1 (73,7% de inhibición en células infectadas a una concentración de 50 μM) sin efecto citotóxico (CC50 = 959), mostrando una citotoxicidad similar al Aciclovir®, un control positivo, por lo cual se perfila como un candidato para la realización de estudios adicionales sobre el potencial de los dolabellanos como agentes antivirales.

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