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2014 ; 10
(11
): 1978-88
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Acidocalcisome is required for autophagy in Trypanosoma brucei
#MMPMID25484093
Li FJ
; He CY
Autophagy
2014[]; 10
(11
): 1978-88
PMID25484093
show ga
Lysosomes play important roles in autophagy, not only in autophagosome
degradation, but also in autophagy initiation. In Trypanosoma brucei, an early
divergent protozoan parasite, we discovered a previously unappreciated function
of the acidocalcisome, a lysosome-related organelle characterized by acidic pH
and large content of Ca(2+) and polyphosphates, in autophagy regulation.
Starvation- and chemical-induced autophagy is accompanied with acidocalcisome
acidification, and blocking the acidification completely inhibits autophagosome
formation. Blocking acidocalcisome biogenesis by depleting the adaptor protein-3
complex, which does not affect lysosome biogenesis or function, also inhibits
autophagy. Overall, our results support the role of the acidocalcisome, a
conserved organelle from bacteria to human, as a relevant regulator in autophagy.