Two class I genes of the chicken MHC have different functions: BF1 is recognized by NK cells while BF2 is recognized by CTLs
The function of the chicken’s major histocompatibility complex (MHC or B complex) class I major (BF2) and minor (BF1) glycoproteins is compared for their expression, ability to present viral antigens to cytotoxic T lymphocytes (CTLs), and interaction with natural killer (NK) cells. MHC-restricted CTLs recognized virus antigen in the context of the BF2*21 major glycoprotein but not the BF1*21 minor glycoprotein. Marek’s disease virus (MDV), a large DNA virus known to reduce the cell surface expression of class I glycoprotein, reduced the expression of BF2 glycoprotein while BF1glycoprotein expressions are remained as no change or slight increase. In addition, the expression of BF1*21 class I glycoprotein protected target cells from NK cell lysis while the expression of the BF2*21 class I glycoprotein enhanced NK cell lysis of target cells. Therefore, BF1 and BF2 provide two different cellular immune functions; BF1 negatively regulates the NK cell killing activity and BF2 restricts the antigen specific CTL immune response.
KeywordsChicken MHC Antigen presentation/processing NK cells Cytotoxic T cells
- B complex
(chicken MHC class I)
(avian leukosis virus)
(Marek’s disease virus)
(Avian Disease and Oncology Laboratory)
We would like to acknowledge Dr. Terry Lemme and Dr. Noah Koller for excellent technical assistance. The authors would like to extend many thanks to Dr. Jim Kaufman for helpful review of this manuscript.
Compliance with ethical standards
Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the U.S. Department of Agriculture.
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