Selective modulation of autophagy, innate immunity, and adaptive immunity by small molecules.

ACS Chem Biol
Authors
Keywords
Abstract

Autophagy is an evolutionarily conserved catabolic process that directs cytoplasmic proteins, organelles and microbes to lysosomes for degradation. Autophagy acts at the intersection of pathways involved in cellular stress, host defense, and modulation of inflammatory and immune responses; however, the details of how the autophagy network intersects with these processes remain largely undefined. Given the role of autophagy in several human diseases, it is important to determine the extent to which modulators of autophagy also modify inflammatory or immune pathways and whether it is possible to modulate a subset of these pathways selectively. Here, we identify small-molecule inducers of basal autophagy (including several FDA-approved drugs) and characterize their effects on IL-1β production, autophagic engulfment and killing of intracellular bacteria, and development of Treg, TH17, and TH1 subsets from naïve T cells. Autophagy inducers with distinct, selective activity profiles were identified that reveal the functional architecture of connections between autophagy, and innate and adaptive immunity. In macrophages from mice bearing a conditional deletion of the essential autophagy gene Atg16L1, the small molecules inhibit IL-1β production to varying degrees suggesting that individual compounds may possess both autophagy-dependent and autophagy-independent activity on immune pathways. The small molecule autophagy inducers constitute useful probes to test the contributions of autophagy-related pathways in diseases marked by impaired autophagy or elevated IL-1β and to test novel therapeutic hypotheses.

Year of Publication
2013
Journal
ACS Chem Biol
Volume
8
Issue
12
Pages
2724-33
Date Published
2013 Dec 20
ISSN
1554-8937
DOI
10.1021/cb400352d
PubMed ID
24168452
PubMed Central ID
PMC3951132
Links
Grant list
DK 097485 / DK / NIDDK NIH HHS / United States
T32 CA079443 / CA / NCI NIH HHS / United States
P30 DK043351 / DK / NIDDK NIH HHS / United States
DK092405 / DK / NIDDK NIH HHS / United States
HHSN268201000044C / HL / NHLBI NIH HHS / United States
R01 DK092405 / DK / NIDDK NIH HHS / United States
Howard Hughes Medical Institute / United States
DK 043351 / DK / NIDDK NIH HHS / United States
HHSN268201000044C / PHS HHS / United States
R01 DK097485 / DK / NIDDK NIH HHS / United States