Expansion of Natural (NK1+) T Cells That Express Alpha Beta T Cell Receptors in Transporters Associated with Antigen Presentation-1 Null and Thymus Leukemia Antigen Positive Mice
Overview
General Medicine
Affiliations
Thymic selection of natural killer-1+ natural T cells that express alpha beta T cell receptors requires a conserved beta 2-microglobulin-associated molecule, presumably CD1d, displayed by CD4+8+ thymocytes. Here we demonstrate that positive selection of natural T cells occurs independent of transporters associated with antigen presentation-1 (TAP-1) function. Moreover, natural T cells in TAP-1o/o mice are numerically expanded. Several H-2 class Ib molecules function in a TAP-independent manner, suggesting that if expressed in TAP-1o/o thymocytes, they could play a role in natural T cell development. Of these class Ib molecules, H-2TL is expressed by TAP-1o/o thymocytes. Moreover, we find that thymi of TL+ mice congenic or transgenic for H-2T18 also have a numerically expanded natural T cell repertoire compared with TL- mice. This expansion, as in TAP-1o/o thymi, is evident in each of the limited T cell receptor V beta chains expressed by natural T cells, suggesting that TL and CD1d impact similar repertoires. Thus TL, in addition to CD1d, plays a role in natural T cell development.
Forming a complex with MHC class I molecules interferes with mouse CD1d functional expression.
Gourapura R, Khan M, Gallo R, Shaji D, Liu J, Brutkiewicz R PLoS One. 2013; 8(8):e72867.
PMID: 24009709 PMC: 3756957. DOI: 10.1371/journal.pone.0072867.
Rakhshandehroo M, Kalkhoven E, Boes M Cell Mol Life Sci. 2013; 70(24):4711-27.
PMID: 23835837 PMC: 11113180. DOI: 10.1007/s00018-013-1414-1.
TL and CD8αα: Enigmatic partners in mucosal immunity.
Olivares-Villagomez D, Van Kaer L Immunol Lett. 2010; 134(1):1-6.
PMID: 20850477 PMC: 2967663. DOI: 10.1016/j.imlet.2010.09.004.
Tsujimura K, Obata Y, Takahashi T Cancer Sci. 2004; 95(6):469-74.
PMID: 15182425 PMC: 11160087. DOI: 10.1111/j.1349-7006.2004.tb03234.x.
Halder R, Kawamura T, Bannai M, Watanabe H, Kawamura H, Mannoor M Immunology. 2001; 102(4):450-9.
PMID: 11328379 PMC: 1783195. DOI: 10.1046/j.1365-2567.2001.01210.x.