Lymphatic endothelial cells are a replicative niche for Mycobacterium tuberculosis
File(s)JCI83379.pdf (7.74 MB)
Published version
Author(s)
Type
Journal Article
Abstract
In extrapulmonary tuberculosis, the most common site of infection is within the lymphatic system, and there is growing recognition that lymphatic endothelial cells (LECs) are involved in immune function. Here, we identified LECs, which line the lymphatic vessels, as a niche for Mycobacterium tuberculosis in the lymph nodes of patients with tuberculosis. In cultured primary human LECs (hLECs), we determined that M. tuberculosis replicates both in the cytosol and within autophagosomes, but the bacteria failed to replicate when the virulence locus RD1 was deleted. Activation by IFN-γ induced a cell-autonomous response in hLECs via autophagy and NO production that restricted M. tuberculosis growth. Thus, depending on the activation status of LECs, autophagy can both promote and restrict replication. Together, these findings reveal a previously unrecognized role for hLECs and autophagy in tuberculosis pathogenesis and suggest that hLECs are a potential niche for M. tuberculosis that allows establishment of persistent infection in lymph nodes.
Date Issued
2016-02-22
Date Acceptance
2016-01-04
Citation
Journal of Clinical Investigation, 2016, 126 (3), pp.1093-1108
ISSN
1558-8238
Publisher
American Society for Clinical Investigation
Start Page
1093
End Page
1108
Journal / Book Title
Journal of Clinical Investigation
Volume
126
Issue
3
Copyright Statement
© 2016 American Society for Clinical Investigation
Sponsor
Wellcome Trust
Grant Number
104803/Z/14/ZR
Subjects
Science & Technology
Life Sciences & Biomedicine
Medicine, Research & Experimental
Research & Experimental Medicine
NITRIC-OXIDE SYNTHASE
INTERFERON-GAMMA
IMMUNE-RESPONSE
CALMETTE-GUERIN
INFECTION
AUTOPHAGY
VASCULATURE
TRAFFICKING
ATTENUATION
GRANULOMAS
Immunology
11 Medical And Health Sciences
Publication Status
Published