TRAIL receptors in the serum of patients with B-cell chronic lymphocytic leukemia.
Great importance in the course of chronic B-cell lymphocytic leukemia (B-CLL) has been ascribed to cytokines belonging to the superfamily of the tumor necrosis factor (TNF), including TRAIL (TNF-related apoptosis inducing ligand) and its specific receptors: TRAIL receptor 1 (TRAIL-R1), TRAIL receptor 2 (TRAIL-R2), TRAIL receptor 3 (TRAIL-R3), TRAIL receptor 4 (TRAIL-R4) and osteoprotegerin (OPG). Both the molecule and the receptors may occur in membrane and soluble forms, except for OPG which has only a soluble form. The aim of the study was to assess the levels of sTRAIL molecule and soluble TRAIL receptors - sTRAIL-R2 and OPG in the serum of patients with B-CLL. The findings revealed reduced concentrations of sTRAIL both before and after treatment and elevated levels of sTRAIL-R2 and OPG in patients before treatment. After treatment with CC (2CdA/Cladrybin and Cyklofosfamid) and FC (Fludarabin and Cyklofosfamid) we observed an increase in sTRAIL and a decrease in sTRAIL-R2. OPG levels were found to increase after treatment with CHOP (Vincristini, Cyklofosfamid, Adriamycin and Prednisol) and they decreased after administration of Leukeran (Chlorambucyl) and CMC (2CdA/Cladrybin, Mitoxanton and Cyklofosfamid). The relationships between TRAIL and its natural regulators in the serum of BCLL patients prior to treatment may impair apoptosis of leukemic B cells. Changes in these relationships after treatment with CC and FC seem to promote enhancement of apoptosis in these cells.
Jablonska
E
E
Department of Immunology, Medical University of Bialystok, Bialystok, Poland. ewaj@amb.edu.pl
Kiersnowska-Rogowska
B
B
Aleksandrowicz-Bukin
M
M
Rogowski
F
F
Sawicka-Powierza
J
J
D006801:Humans; D015451:Leukemia, Lymphocytic, Chronic, B-Cell / Q000097:blood*; D053244:Osteoprotegerin / Q000097:blood*; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand / Q000097:blood*
D053244:Osteoprotegerin; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand