Transcript levels of DNA methyltransferases DNMT1, DNMT3A and DNMT3B in CD4+ T cells from patients with systemic lupus erythematosus

Immunology
Eva BaladaMiquel Vilardell-Tarrés

Abstract

Global DNA hypomethylation in CD4(+) T cells has been detected in systemic lupus erythematosus (SLE) and it seems to be linked to its pathogenesis. We investigated the relationship between overall DNA methylation and the expression of three DNA (cytosine-5) methyltransferases involved in the DNA methylation process. The DNA deoxymethylcytosine (dmC) content of purified CD4(+) T cells from 29 SLE patients and 30 healthy controls was measured by means of an enzyme-linked immunosorbent assay (ELISA). The transcript levels of DNA cytosine-5-methyltransferase 1 (DNMT1), DNA cytosine-5-methyltransferase 3A (DNMT3A) and DNA cytosine-5-methyltransferase 3B (DNMT3B) were quantified by real-time reverse transcription-polymerase chain reaction (RT-PCR). Association studies were also carried out with several laboratory parameters, as well as with the patients' clinical manifestations. SLE patients had a significantly lower CD4(+) T-cell DNA dmC content than controls (0.802 +/- 0.134 versus 0.901 +/- 0.133) (P = 0.007). No differences in transcript levels were observed for DNMT1, DNMT3A and DNMT3B between patients and controls. The simultaneous association of low complement counts with lymphopenia, high titres of anti-double-stranded DNA (a...Continue Reading

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Citations

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