CD45RO+ T-cells immunoregulate spontaneous in vitro immunoglobulin production by normal and chronic lymphocytic leukaemia B-cells

Leukemia & Lymphoma
E A FrolovaR A Jones

Abstract

Immunophenotypic changes in the T-cell compartment in B-CLL are well recognised, although the functional significance is less well established. In this study we examined the immunoregulatory capacity of CD45RO+ T-cells to modulate in vitro IgG and IgM production by B-CLL cells in comparison to normal PB B-cells. Removal of CD45RO+ T-cells from normal PB lymphocyte cultures was associated with a 2.3-fold reduction in IgM production and a 7.9-fold reduction in IgG production. Activation of the T-cell component by alpha CD3 stimulation enhanced IgG and IgM production by factors of 1.85 and 3.4 respectively. Removal of CD45RO+ T-cells from alpha CD3-stimulated cultures reduced IgG production 3.7-fold, whereas no significant change in IgM production occurred. Supplementing T- and NK-depleted B-cell fractions with purified autologous CD45RO+ T-cells produced a positive correlation between Ig concentration and the CD45RO:CD19 ratio for IgG production but not for IgM. Collectively, these results suggest that: 1) 'resting' CD45RO+ ('primed' or memory) T-cells drive mainly the IgG response; 2) activation of these T-cells enhances this response; 3) activated CD45RO+ T-cells derived from the recent transformation of the CD45RA+ ('virgin' o...Continue Reading

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Citations

Nov 26, 2003·Scandinavian Journal of Immunology·B VitaleB Jaksić
Jun 3, 2009·Nature Reviews. Clinical Oncology·Lisa PleyerRichard Greil

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