IMR Press / FBL / Volume 9 / Issue 1 / DOI: 10.2741/1215

Frontiers in Bioscience-Landmark (FBL) is published by IMR Press from Volume 26 Issue 5 (2021). Previous articles were published by another publisher on a subscription basis, and they are hosted by IMR Press on as a courtesy and upon agreement with Frontiers in Bioscience.

Open Access Article
The relationship of HLA antigens to doxycycline induced apoptosis in immortalized B cells
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1 Department of Medicine, Long Island Jewish Medical Center, New Hyde Park, New York 11040
2 Department of Medicine, Weill Medical College of Cornell University, New York, New York 10021
Front. Biosci. (Landmark Ed) 2004, 9(1), 154–158;
Published: 1 January 2004

Previous studies have shown two subsets of Lyme disease (LD) patients: a seropositive group with a high frequency of the HLA class II antigen, HLA-DR7 (DR7+), and a seronegative group with a low frequency of HLA-DR7 (DR7-). The present study examined the hypothesis that the absence or presence of this antigen may play a role in the mode of B cell death induced by doxycycline. B cells, obtained from one HLA-DR7- (AL7N) and one HLA-DR7+ (MM7P) normal volunteers, were immortalized using Epstein-Barr Virus (EBV). Doxycycline resulted in a dose-dependent decrease in cell viability which was not different between the two cell lines. DNA from the MM7P showed a strong internucleosomal fragmentation pattern consistent with apoptosis, while the AL7N showed a weaker pattern, when treated with doxycycline, 20 ug/ml, for 16 hours, a result confirmed with the TUNEL assay. In the MM7P, the level of inducible p53 peaked at 8 hours while no changes were observed in the AL7N. A much higher level of HLA class II and HLA-DR was observed in the AL7N cell line which was not affected by doxycycline. These results support the conclusion that doxycycline induces p53-dependent apoptosis in MM7P. Although doxycycline induces death in AL7N, the mode and mechanism require further study.

Epstein-Barr virus
Programmed Cell Death
HLA class II
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