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THE ANTI-PROMYELOCYTIC LEUKEMIA MODE OF ACTION OF TWO ENDOPHYTIC SECONDARY METABOLITES UNVEILED BY A PROTEOMIC APPROACH
Papulaspora immersa
Trichosphaeriaceae
Nigrospora sphaerica
Aphidicolin
Epoxyergostane‑type steroid
Autor
Afiliación
University of Pittsburgh. Department of Pharmaceutical Sciences. Pittsburgh, PA, USA / Universidade de São Paulo. Faculdade de Ciências Farmacêuticas de Ribeirão Preto. Ribeirão Preto, SP, Brasil / Fundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, Brasil.
University of Pittsburgh. Department of Pharmacology & Chemical Biology. Pittsburgh, PA, USA.
Fundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, Brasil / Escola Bahiana de Medicina e Saúde Pública. Núcleo de Biotecnologia e Bioprospecção. Salvador, BA, Brasil.
Escola Bahiana de Medicina e Saúde Pública. Núcleo de Biotecnologia e Bioprospecção. Salvador, BA, Brasil.
University of Pittsburgh. Department of Pharmaceutical Sciences. Pittsburgh, PA, USA.
University of Pittsburgh. Center for Vaccine Research. Pittsburgh, PA, USA.
Universidade de São Paulo. Faculdade de Ciências Farmacêuticas de Ribeirão Preto. Ribeirão Preto, SP, Brasil.
University of Pittsburgh. Department of Pharmaceutical Sciences. Pittsburgh, PA, USA.
University of Pittsburgh. Department of Pharmacology & Chemical Biology. Pittsburgh, PA, USA.
Fundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, Brasil / Escola Bahiana de Medicina e Saúde Pública. Núcleo de Biotecnologia e Bioprospecção. Salvador, BA, Brasil.
Escola Bahiana de Medicina e Saúde Pública. Núcleo de Biotecnologia e Bioprospecção. Salvador, BA, Brasil.
University of Pittsburgh. Department of Pharmaceutical Sciences. Pittsburgh, PA, USA.
University of Pittsburgh. Center for Vaccine Research. Pittsburgh, PA, USA.
Universidade de São Paulo. Faculdade de Ciências Farmacêuticas de Ribeirão Preto. Ribeirão Preto, SP, Brasil.
University of Pittsburgh. Department of Pharmaceutical Sciences. Pittsburgh, PA, USA.
Resumen en ingles
As a result of a program to find antitumor compounds of endophytes from medicinal Asteraceae, the steroid (22E,24R)-8,14-epoxyergosta-4,22-diene-3,6-dione (a) and the diterpene aphidicolin (b) were isolated from the filamentous fungi Papulaspora immersa and Nigrospora sphaerica, respectively, and exhibited strong cytotoxicity against HL-60 cells. A proteomic approach was used in an attempt to identify the drugs' molecular targets and their respective antiproliferative mode of action. Results suggested that the (a) growth inhibition effect occurs by G2/M cell cycle arrest via reduction of tubulin alpha and beta isomers and 14-3-3 protein gamma expression, followed by a decrease of apoptotic and inflammatory proteins, culminating in mitochondrial oxidative damage that triggered autophagy-associated cell death. Moreover, the decrease observed in the expression levels of several types of histones indicated that (a) might be disarming oncogenic pathways via direct modulation of the epigenetic machinery. Effects on cell cycle progression and induction of apoptosis caused by (b) were confirmed. In addition, protein expression profiles also revealed that aphidicolin is able to influence microtubule dynamics, modulate proteasome activator complex expression, and control the inflammatory cascade through overexpression of thymosin beta 4, RhoGDI2, and 14-3-3 proteins. Transmission electron micrographs of (b)-treated cells unveiled dose-dependent morphological characteristics of autophagy- or oncosis-like cell death.
Palabras clave en ingles
ChaetomiaceaePapulaspora immersa
Trichosphaeriaceae
Nigrospora sphaerica
Aphidicolin
Epoxyergostane‑type steroid
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