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Murine class II (Ia) molecules associate with human invariant chain
Journal of Immunology (Baltimore, Md. : 1950)
|March 1, 1987
Summary
Major histocompatibility complex (MHC) class II molecules interact with the invariant chain (Ii) within cells. This study shows human invariant chain can bind mouse MHC class II, enabling cell surface expression and T cell recognition.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- Polymorphic class II (Ia) major histocompatibility complex (MHC) molecules associate with the invariant chain (Ii) intracellularly.
- The invariant chain's precise role in Ia molecule assembly, transport, and cell surface expression remains incompletely understood.
Purpose of the Study:
- To investigate the functional interaction between murine class II antigens and human invariant chain.
- To determine if human invariant chain can facilitate the cell surface expression of murine class II antigens.
Main Methods:
- Utilized an interspecies mouse-human hybrid cell line lacking the murine invariant chain gene.
- Performed biochemical analysis to assess the association between murine Ia antigens and human invariant chain.
- Evaluated the cell surface expression and antigen-presenting function of murine Ia antigens.
Main Results:
- Murine polymorphic class II antigens successfully associated with the human invariant chain intracellularly.
- These associated murine Ia antigens were expressed on the cell surface.
- Biochemical analysis confirmed conserved interaction regions between species-specific invariant chains and Ia molecules.
Conclusions:
- The invariant chain plays a crucial role in the intracellular trafficking and cell surface expression of MHC class II molecules.
- The functional domains of the invariant chain involved in Ia molecule interaction are conserved across species.
- This cross-species interaction highlights conserved mechanisms in antigen presentation pathways.