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 PMID:25883318  

T cell metabolism. The protein LEM promotes CD8⁺ T cell immunity through effects on mitochondrial respiration.

Isobel Okoye | Lihui Wang | Katharina Pallmer | Kirsten Richter | Takahuru Ichimura | Robert Haas | Josh Crouse | Onjee Choi | Dean Heathcote | Elena Lovo | Claudio Mauro | Reza Abdi | Annette Oxenius | Sophie Rutschmann | Philip G Ashton-Rickardt
Science (New York, N.Y.) | 2015

Protective CD8(+) T cell-mediated immunity requires a massive expansion in cell number and the development of long-lived memory cells. Using forward genetics in mice, we identified an orphan protein named lymphocyte expansion molecule (LEM) that promoted antigen-dependent CD8(+) T cell proliferation, effector function, and memory cell generation in response to infection with lymphocytic choriomeningitis virus. Generation of LEM-deficient mice confirmed these results. Through interaction with CR6 interacting factor (CRIF1), LEM controlled the levels of oxidative phosphorylation (OXPHOS) complexes and respiration, resulting in the production of pro-proliferative mitochondrial reactive oxygen species (mROS). LEM provides a link between immune activation and the expansion of protective CD8(+) T cells driven by OXPHOS and represents a pathway for the restoration of long-term protective immunity based on metabolically modified cytotoxic CD8(+) T cells.

Pubmed ID: 25883318

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Associated grants

  • Agency: NIAID NIH HHS, United States
    Id: AI45108
  • Agency: British Heart Foundation, United Kingdom
    Id: FS/12/38/29640
  • Agency: Cancer Research UK, United Kingdom
    Id: A9995
  • Agency: Medical Research Council, United Kingdom
    Id: G0700795
  • Agency: NIAID NIH HHS, United States
    Id: AI091930
  • Agency: Wellcome Trust, United Kingdom

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International Mouse Phenotyping Consortium (IMPC) (tool)

RRID:SCR_006158

Center that produces knockout mice and carries out high-throughput phenotyping of each line in order to determine function of every gene in mouse genome. These mice will be preserved in repositories and made available to scientific community representing valuable resource for basic scientific research as well as generating new models for human diseases.

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