Mycobacterium tuberculosis induces the miR-33 locus to reprogram autophagy and host lipid metabolism
Ouimet, Mireille ; Cecchini, Katharine ; Zamore, Philip D. ; Moore, Kathryn J.
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Abstract
Mycobacterium tuberculosis (Mtb) survives in macrophages by evading delivery to the lysosome and promoting the accumulation of lipid bodies, which serve as a bacterial source of nutrients. We found that by inducing the microRNA (miRNA) miR-33 and its passenger strand miR-33*, Mtb inhibited integrated pathways involved in autophagy, lysosomal function and fatty acid oxidation to support bacterial replication. Silencing of miR-33 and miR-33* by genetic or pharmacological means promoted autophagy flux through derepression of key autophagy effectors (such as ATG5, ATG12, LC3B and LAMP1) and AMPK-dependent activation of the transcription factors FOXO3 and TFEB, which enhanced lipid catabolism and Mtb xenophagy. These data define a mammalian miRNA circuit used by Mtb to coordinately inhibit autophagy and reprogram host lipid metabolism to enable intracellular survival and persistence in the host.
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Nat Immunol. 2016 Jun;17(6):677-86. doi: 10.1038/ni.3434. Epub 2016 Apr 18. Link to article on publisher's site
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Full list of authors omitted for brevity. For full list see article.