Abstract

In 2015 we investigated the mechanisms by which activated CD8+ T cells unregulated inhibitor molecules and became dysfunctional. We found that the Treg-suppressed CD8+ T cells unregulated expression of SIRPa, the ligand for CD47, which is upregulated on infected cells. Interestingly, SIRPa appears to be a new marker for exhausted/suppressed CD8+ T cells suggesting that blockade of CD47-SIRPa interactions could lead to reactivation of the effector CD8+ T cells, particlulary if done in conjunction with blockade of the PD-1-PDL-1 axis. A patent protection the IP of our findings on CD47 was filed.

  Funding Agency

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Investigator-Initiated Intramural Research Projects (ZIA)
Project #
1ZIAAI001100-07
Application #
9161657
Study Section
Project Start
Project End
Budget Start
Budget End
Support Year
7
Fiscal Year
2015
Total Cost
Indirect Cost

  Institution

Name
Niaid Extramural Activities
Department
Type
DUNS #
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State
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  Publications

Lavender, Kerry J; Messer, Ronald J; Race, Brent et al. (2014) Production of bone marrow, liver, thymus (BLT) humanized mice on the C57BL/6 Rag2(-/-)?c(-/-)CD47(-/-) background. J Immunol Methods 407:127-34
Halemano, Kalani; Guo, Kejun; Heilman, Karl J et al. (2014) Immunoglobulin somatic hypermutation by APOBEC3/Rfv3 during retroviral infection. Proc Natl Acad Sci U S A 111:7759-64
Messer, Ronald J; Lavender, Kerry J; Hasenkrug, Kim J (2014) Mice of the resistant H-2(b) haplotype mount broad CD4(+) T cell responses against 9 distinct Friend virus epitopes. Virology 456-457:139-44
Joedicke, Jara J; Zelinskyy, Gennadiy; Dittmer, Ulf et al. (2014) CD8+ T cells are essential for controlling acute friend retrovirus infection in C57BL/6 mice. J Virol 88:5200-1
Li, Sam X; Barrett, Bradley S; Heilman, Karl J et al. (2014) Tetherin promotes the innate and adaptive cell-mediated immune response against retrovirus infection in vivo. J Immunol 193:306-16
Thorborn, Georgina; Ploquin, Mickaël J; Eksmond, Urszula et al. (2014) Clonotypic composition of the CD4+ T cell response to a vectored retroviral antigen is determined by its speed. J Immunol 193:1567-77
Manzke, Nora; Akhmetzyanova, Ilseyar; Hasenkrug, Kim J et al. (2013) CD4+ T cells develop antiretroviral cytotoxic activity in the absence of regulatory T cells and CD8+ T cells. J Virol 87:6306-13
Lavender, Kerry J; Pang, Wendy W; Messer, Ronald J et al. (2013) BLT-humanized C57BL/6 Rag2-/-?c-/-CD47-/- mice are resistant to GVHD and develop B- and T-cell immunity to HIV infection. Blood 122:4013-20
Harper, Michael S; Barrett, Bradley S; Smith, Diana S et al. (2013) IFN-? treatment inhibits acute Friend retrovirus replication primarily through the antiviral effector molecule Apobec3. J Immunol 190:1583-90
Kubinak, J L; Ruff, J S; Cornwall, D H et al. (2013) Experimental viral evolution reveals major histocompatibility complex polymorphisms as the primary host factors controlling pathogen adaptation and virulence. Genes Immun 14:365-72

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