Effects of fumonisin B1 on HLA class I antigen presentation and processing pathway in GES-1 cells in vitro

Abstract

Fumonisin B1 (FB1) is a food-borne mycotoxin produced by genus Fusarium and was classified as possible carcinogen to humans by the International Agency for Research on Cancer (IARC). Human leukocyte antigen (HLA) class I antigen presentation pathway plays an important role in immunosurveillance. Defects in HLA class I antigen presentation pathway can down-regulate the expression of HLA class I antigen on the surface of nucleated cells that will confer a survival advantage to randomly mutant cells and may lead to malignant transformation. In the present study, we analyzed the effects of FB1 on the expression of HLA class I heavy chain (classical HLA-A, -B and -C genes included), beta2-microglobulin (β2m), LMP2 and TAP1 genes in human gastric epithelial immortalized GES-1 cells in vitro using semi-quantitative Reverse Transcription Polymerase Chain Reaction (RT-PCR), Western blot and immunocytochemical methods in dose- and time-effect studies. Our results revealed that FB1 have an effect on HLA class I antigen presentation pathway via the decreased expression of HLA class I heavy chain and/or defects of LMP2 and TAP1 expression. However, the importance of this effect in carcinogenesis needs further investigation.

Keywords

fumonisin B1 HLA class I β2m LMP2 TAP1 Western blot immunocytochemistry

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