Hydatid fluid from Echinococcus granulosus induces phagophore and autophagosome formation in dendritic cells through an upregulation of Beclin-1

CHOP, MAIA; NICOLAO, MARÍA CELESTE; LOOS, JULIA A.; LEDO, CAMILA; CUMINO, ANDREA C.; RODRIGUEZ RODRIGUES, CHRISTIAN

Congreso; Reunión conjunta SAIC-SAI-AAFE-NANOMED.AR; 2021

Background: The cestode Echinococcus granulosus (Eg) is the etiological agent of cystic echinococcosis. This parasite develops cysts filled with hydatid fluid (HF) in the viscera of the intermediate host. Autophagy is a cellular catabolic process that plays a key role in the presentation of endogenous and exogenous proteins, promoting the activation of T cells. The aim of this work is to analyze if HF, constituted by a wide range of parasite proteins, could trigger autophagy in dendritic cells. Methods: HF was punctured from the hydatid cysts collected of infected cattle slaughtered. Murine BMDCs were cultured in RPMI 1640 medium, supplemented with FLT3-L. First, lysosome activity was evaluated using Acridine Orange, a fluorophore that can be trapped in acidic vesicular organelles. Then, autophagy induction was evaluated by FACS, qPCR, Confocal and Transmission Electron Microscopy. Rapamycin (20 nM) and chloroquine (100μM) were used to modulate autophagic flux. LC3-attachment to the autophagic membrane, were analyzed by stained DCs with anti LC3-β antibody (clone H50). Results: HF significantly increased acridine orange cytoplasmic accumulation compared to control cells (***p