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. 1991 Apr;84(1):170–174. doi: 10.1111/j.1365-2249.1991.tb08143.x

Internalization of MHC class I molecules is a prerequisite for endocytosis of endorphin by lymphocytes.

A M Mommaas 1, M C Wijsman 1, W Verduijn 1, B J Vermeer 1, F M Claas 1
PMCID: PMC1535355  PMID: 2015708

Abstract

The nature of the interaction between gamma-type endorphins and the HLA class I molecules was studied by immunoelectronmicroscopy. The HLA molecules were not involved in the actual binding of endorphin to the cell. In contrast, for the endocytosis of gamma-endorphin, co-internalization of the HLA class I molecules is essential. The internalization process starts with clustering of gamma-endorphin and HLA class I molecules in coated pits. Cells that do not carry HLA class I molecules (Daudi) or do not internalize HLA class I molecules (EBV-transformed B cells) bind but do not internalize gamma-endorphin. On the basis of these observations, we suggest that the MHC class I molecules may function as transport molecules. Whether it is a general phenomenon that non-immunological ligands use the HLA class I molecules to get into the cell and immunological ligands (viral proteins) to reach the cell surface, remains to be established.

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Selected References

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