TY - JOUR
T1 - Chemical xenogenization induced by triazene compounds
T2 - Changes of susceptibility to NK-mediated cytolysis of human lymphoblastoid cells treated with monomethyl-triazene-benzoic acid
AU - Bonmassar, L.
AU - D'Atri, S.
AU - Turriziani, M.
AU - Lassiani, L.
AU - Giuliani, A.
PY - 1994
Y1 - 1994
N2 - Previous studies showed how in vivo treatment wit]h Dacarbazine or with other triazene compounds renders murine leukemia cells highly immunogenic (i.e. chemical xenogenization' or CX phenomenon) and susceptible to natural immunity [operationally defined as CX concerning natural immunity (NI), i.e. CX (NI)]. Triazenes are profoundly immunodepressant, and interferons, including interferon-beta (IFN), antagonize drug-induced impairment of NI. Therefore, experiments have been performed to study the complex interaction between triazenes and IFN on human target cells in vitro, searching for a possible CX (NI) phenomenon. Natural killer (NK) cells (which represent part of the NI system in vitro) obtained from different donors, were tested against target EBV-immortalized B cells, untreated or treated with MTBA for 2 - 6 transfer generations. The results showed that: (a) four lymphoblastoid cell lines (Xn lines) exposed to multiple treatments in vitro with MTBA gave origin to MTBA-treated sublines (XnMm lines), which were more susceptible (X3Mm), or less suceptible (X1Mm) with respect to parental cells, to NK-mediated cytolysis; (b) treatment of target cells with IFN reduced their suspeptibility to NK effector lymphocytes in X3 and X3Mm, but not in X1 and X1Mm blasts; (c) no difference in the expression of CD19 and CD22 B-cell markers was found between X3 and X3M3 cell lines. However, reduction of these antigens was detected following treatment with IFN. These results could provide rational bases for optimizing immuno-chemotherapy protocols using triazenes and IFN in lymphoma-bearing patients.
AB - Previous studies showed how in vivo treatment wit]h Dacarbazine or with other triazene compounds renders murine leukemia cells highly immunogenic (i.e. chemical xenogenization' or CX phenomenon) and susceptible to natural immunity [operationally defined as CX concerning natural immunity (NI), i.e. CX (NI)]. Triazenes are profoundly immunodepressant, and interferons, including interferon-beta (IFN), antagonize drug-induced impairment of NI. Therefore, experiments have been performed to study the complex interaction between triazenes and IFN on human target cells in vitro, searching for a possible CX (NI) phenomenon. Natural killer (NK) cells (which represent part of the NI system in vitro) obtained from different donors, were tested against target EBV-immortalized B cells, untreated or treated with MTBA for 2 - 6 transfer generations. The results showed that: (a) four lymphoblastoid cell lines (Xn lines) exposed to multiple treatments in vitro with MTBA gave origin to MTBA-treated sublines (XnMm lines), which were more susceptible (X3Mm), or less suceptible (X1Mm) with respect to parental cells, to NK-mediated cytolysis; (b) treatment of target cells with IFN reduced their suspeptibility to NK effector lymphocytes in X3 and X3Mm, but not in X1 and X1Mm blasts; (c) no difference in the expression of CD19 and CD22 B-cell markers was found between X3 and X3M3 cell lines. However, reduction of these antigens was detected following treatment with IFN. These results could provide rational bases for optimizing immuno-chemotherapy protocols using triazenes and IFN in lymphoma-bearing patients.
KW - Chemical xenogenization
KW - Interferon
KW - Lymphoblastoid cells
KW - Natural immunity
KW - NK
KW - Triazenes
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M3 - Article
AN - SCOPUS:0028559988
VL - 13
SP - 355
EP - 363
JO - Journal of Experimental and Clinical Cancer Research
JF - Journal of Experimental and Clinical Cancer Research
SN - 0392-9078
IS - 4
ER -