Compromised Metabolic Reprogramming Is an Early Indicator of CD8+ T Cell Dysfunction during Chronic Mycobacterium tuberculosis Infection.
Cell Rep
; 29(11): 3564-3579.e5, 2019 12 10.
Article
in En
| MEDLINE
| ID: mdl-31825836
ABSTRACT
The immunometabolic mechanisms underlying suboptimal T cell immunity in tuberculosis remain undefined. Here, we examine how chronic Mycobacterium tuberculosis (Mtb) and M. bovis BCG infections rewire metabolic circuits and alter effector functions in lung CD8+ T cells. As Mtb infection progresses, mitochondrial metabolism deteriorates in CD8+ T cells, resulting in an increased dependency on glycolysis that potentiates inflammatory cytokine production. Over time, these cells develop bioenergetic deficiencies that reflect metabolic "quiescence." This bioenergetic signature coincides with increased mitochondrial dysfunction and inhibitory receptor expression and was not observed in BCG infection. Remarkably, the Mtb-triggered decline in T cell bioenergetics can be reinvigorated by metformin, giving rise to an Mtb-specific CD8+ T cell population with improved metabolism. These findings provide insights into Mtb pathogenesis whereby glycolytic reprogramming and compromised mitochondrial function contribute to the breakdown of CD8+ T cell immunity during chronic disease, highlighting opportunities to reinvigorate immunity with metabolically targeted pharmacologic agents.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Cytokines
/
CD8-Positive T-Lymphocytes
/
Latent Tuberculosis
/
Glycolysis
/
Mitochondria
Limits:
Animals
Language:
En
Journal:
Cell Rep
Year:
2019
Document type:
Article
Affiliation country:
Sudáfrica