Mitochondrial respiratory capacity is a critical regulator of CD8+ T cell memory development.
CD8(+) T cells undergo major metabolic changes upon activation, but how metabolism influences the establishment of long-lived memory T cells after infection remains a key question. We have shown here that CD8(+) memory T cells, but not CD8(+) T effector (Teff) cells, possessed substantial mitochondrial spare respiratory capacity (SRC). SRC is the extra capacity available in cells to produce energy in response to increased stress or work and as such is associated with cellular survival. We found that interleukin-15 (IL-15), a cytokine critical for CD8(+) memory T cells, regulated SRC and oxidative metabolism by promoting mitochondrial biogenesis and expression of carnitine palmitoyl transferase (CPT1a), a metabolic enzyme that controls the rate-limiting step to mitochondrial fatty acid oxidation (FAO). These results show how cytokines control the bioenergetic stability of memory T cells after infection by regulating mitochondrial metabolism.
Trudeau Institute, Saranac Lake, NY 12983, USA.
Gerritje J W
GJ
van der Windt
Bart
B
Everts
Chih-Hao
CH
Chang
Jonathan D
JD
Curtis
Tori C
TC
Freitas
Eyal
E
Amiel
Edward J
EJ
Pearce
Erika L
EL
Pearce
D000818:Animals; D018414:CD8-Positive T-Lymphocytes / Q000166:cytology* / Q000201:enzymology / Q000276:immunology*; D002334:Carnitine O-Palmitoyltransferase / Q000378:metabolism; D019069:Cell Respiration / Q000502:physiology; D005227:Fatty Acids / Q000378:metabolism; D005434:Flow Cytometry; D007156:Immunologic Memory; D019409:Interleukin-15 / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D008928:Mitochondria / Q000201:enzymology / Q000378:metabolism*; D008954:Models, Biological; D010084:Oxidation-Reduction; D060888:Real-Time Polymerase Chain Reaction
D005227:Fatty Acids; D019409:Interleukin-15; D002334:Carnitine O-Palmitoyltransferase