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Minerva Medica 2003 October;94(5):331-40

language: English, Italian

Direct or reverse correlations within the ex-pression of activation, differentiation or T-B cooperation molecules on chronic lymphocytic leukemia B cells

Sellitto A., De Fanis U., Romano C., Dalla Mora L., Guastafierro S., Tirelli A., Lucivero G.


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Aim. B-cell chronic lymphocytic leukemia (B-CLL) is characterized by homogeneous coexpression of CD19, CD23 and CD5, and poor expression of membrane Ig. The aim of this study was to evaluate, in B-CLL patients and in healthy subjects by flow cytometry, B cell expression of surface molecules involved in cell activation, differentiation, T-B cooperation and apoptosis.
Methods. The study population consisted of 29 patients (16 men and 13 women; mean age: 66.5 years) with B-CCL. The control group consisted of 16 sex- and age-matched healthy subjects. The results are reported as percentages and mean fluorescence intensity (MFI) of CD19+ cells coexpressing each analyzed molecule.
Results. We found that the lymphocyte activation markers, CD69, CD25 and CD11c, were more expressed in B-CLL patients than controls. CD38 and CD95 expressions were higher on normal B lymphocytes than leukemic B cells. Finally, CD80 and CD86, molecules involved in T-B cooperation, showed an inverse expression between lymphocytes of B-CLL patients and healthy subjects. CD80 was higher on normal than leukemic B cells, while CD86 expression was higher on CLL B cells. Linear regression analysis showed a positive correlation between CD80 and CD95 expression on leukemic B cells; a reverse correlation was observed between CD69 and CD11c.
Conclusion. These results suggest that common mechanisms may regulate the simultaneous expression of CD80 and CD95 or the reverse expression of CD69 and CD11c, respectively, in different stages of B cell activation and/or differentiation.

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