International Immunology, Vol. 12, No. 9, 1311-1318,
September 2000
© 2000 Japanese Society for Immunology
Influence of nucleotide polymorphisms in the CCR2 gene and the CCR5 promoter on the expression of cell surface CCR5 and CXCR4
Department of Biochemistry, Chung Shan Medical and Dental College, No. 110, Section 1, Chien Kuo North Road, Taichung 402, Taiwan, ROC
1 Institute of Microbiology and Immunology,
2 Department of Public Health, and
3 Institute of Molecular Medicine, National Cheng Kung University Medical College, No. 1, Ta Hsueh Road, Tainan 701, Taiwan, ROC
Correspondence to: C. Li
Polymorphisms in the CCR2 gene (CCR2-64I) and the CCR5 promoter (pCCR5-59029G) have been correlated with slower HIV-1 disease progression. How these polymorphisms influence the rate of AIDS progression has remained unclear. We have therefore investigated whether these nucleotide polymorphisms will reduce the expression levels of surface CCR5 and CXCR4, and thus lead to slower AIDS progression. For this, a cohort of Chinese volunteers in Taiwan was subjected to the determination of CCR2 and pCCR5 genotypes followed by analysis of the surface CCR5 and CXCR4 expression on five cell types derived from peripheral blood mononuclear cells by flow cytometry. Several significant associations were detected between genotypes and expression levels of the proteins. The most important finding was that an increased number of CD4+ cells expressing CCR5 correlated with pCCR5-59029A homozygosity without the interference of both the CCR2-64 and the CCR5
32 (deleted 32 bp) mutations (P = 0.0453), which is consistent with the previous data on the association of the genotype to AIDS progression. Since different genetic polymorphisms co-exist in human beings, the rate of AIDS progression as well as the risk of rheumatoid arthritis may be governed by the interplay of the array of nucleotide changes and their affected proteins.
Keywords: AIDS progression, CCR2, CCR5, HIV-1, nucleotide polymorphism
Y.-E. L., P.-S. H. and Y.-P. Y contributed equally to this work
Transmitting editor: K. Takatsu
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