Work

MHC Class I Heavy Chain mRNA Must Exceed a Threshold Level for the Reconstitution of Cell Surface Expression of Class I MHC Complexes in Cells Transformed by the Highly Oncogenic Adenovirus 12

Year: 1998

Type: article

Abstract: In primary embryonal fibroblasts from transgenic mice expressing H-2(b) genes and a miniature swine class I transgene (PD1), transformation with adenovirus 12 results in suppression of assembly and cell surface expression of all class I complexes. Cell surface expression of PD1 can be recovered by transfecting the cells with peptide transporter genes. However, reconstitution of the H-2Kb gene expression requires, in addition, a 2-fold increase in the steady state level of the H-2Kb mRNA that can be attained by treatment of the cells with interferons or by transfecting them with the H-2Kb gene. A detailed analyses of the biogenesis of class I molecules has revealed the steady state expression of free class I heavy chains that are not converted into conformed complexes even when peptide transporter genes are overexpressed. The fact that class I complex assembly seems to be highly inefficient in certain cell lines might be a major in vivo obstacle for the elimination of transformed or virus-infected cells by cytotoxic T lymphocytes, especially in view of the fact that the level of class I gene transcription is often down-regulated in cancer cells and/or that assembly of class I major histocompatibility complexes can be subverted by virus-encoded proteins.

Source: Journal of Biological Chemistry

DOI: 10.1074/jbc.273.24.15209

Authors: Sharon Vigodman Fromm, Sigal Winograd Mey-Tal, John E. Coligan, Chana Schechter, Rachel Ehrlich

Institutions: Tel Aviv University, National Institutes of Health, National Institute of Allergy and Infectious Diseases

Language: English

Topic: Immunotherapy and Immune Responses

Subfield: Immunology

Field: Immunology and Microbiology

Domain: Life Sciences

SDG: Good health and well-being

Open Access status: hybrid

Estimated APC paid: $3,430