Article
Induction of autophagy correlates with increased parasite load of Leishmania amazonensis in BALB/c but not C57BL/6 macrophages
Registro en:
PINHEIRO, Roberta O. et al. Induction of autophagy correlates with increased parasite load of Leishmania amazonensis in BALB/c but not C57BL/6 macrophages. Microbes and Infection, v. 11, p. 181-190, 2009.
1286-4579
10.1016/j.micinf.2008.11.006
1769-714X
Autor
Pinheiro, Roberta O.
Nunes, Marise P.
Pinheiro, Carla S.
D'Avila, Heloisa
Bozza, Patrícia T.
Takiya, Christina M.
Côrte-Real, Suzana
Lima, Célio G. Freire de
Reis, George A. dos
Resumen
We investigated the role of autophagy in infection of macrophages by Leishmania amazonensis. Induction of autophagy by IFN-gamma or starvation increased intracellular parasite load and the percentages of infected macrophages from BALB/c but not from C57BL/6 mice. In contrast, starvation did not affect the replication of either Leishmania major or Trypanosoma cruzi in BALB/c macrophages. In BALB/c macrophages, starvation resulted in increased monodansylcadaverine staining and in the appearance of double-membrane and myelin-like vesicles characteristic of autophagosomes. Increased parasite load was associated with a reduction in NO levels and was attenuated by wortmannin, an inhibitor of autophagy. In infected macrophages from BALB/c, but not from C57BL/6 mice, starvation increased the number of lipid bodies and the amounts of PGE(2) produced. Exogenous PGE(2) increased parasite load in macrophages from BALB/c, but not C57BL/6 mice. The cyclooxygenase inhibitor indomethacin prevented the increase of parasite load in starved BALB/c macrophages, and actually induced parasite killing. These results suggest that autophagy regulates the outcome of L. amazonensis infection in macrophages in a host strain specific manner. 2030-01-01