Following 'in vivo' treatment with 5-(3-3'-dimethyl-1-triazeno)imidazole-4-carboxamide (DTIC), murine leukemic cells acquire new antigenic specificities not detectable on parental cells and responsible for the rejection of the tumour by syngeneic hosts. 'In vivo' and 'in vitro' experiments pointed out an immunological cross reactivity between DTIC treated and untreated lines. Furthermore, specific CTLs raised against DTIC treated L1210 tumour cells (H-2d) were cytotoxic for H-2k target cells. The aim of this study is to investigate whether the H-2k cross reactivity displayed by L1210/DTIC is related to the drug treatment rather than due to an antigen already present in the parental line and maintained after treatment. Cloned cells from L1210, obtained by limiting dilution 'in vitro', were recloned 'in vivo' and then treated with DTIC. Syngeneic and allogeneic CTLs raised 'in vitro' against parental and treated clones showed lytic activity against H-2k target cells. Treated and untreated clones were then checked for the presence of H-2k-like determinants using monoclonal antibodies. One of these, HB-53 (IgG2bKkDk) was highly positive with all the clones tested in binding assay using iodinated Fab anti-mouse Ig, fluorescence and FACS analysis. Others displayed a low reactivity against both treated and untreated clones without significant differences. After neuraminidase treatment of two clones (D and D/DTIC), the H-100.5 (anti H-2Kk)-reactive epitope was dramatically exposed on the DTIC tumour cells but not on the parental clones. These data suggest that the H-2k cross reactivity is related to the presence of a TAA that is maintained after treatment.(ABSTRACT TRUNCATED AT 250 WORDS)

Functional studies of H-2k-like epitopes on DTIC treated and untreated L1210 (H-2d) clones / O. Marelli, P. Franco, M.O. Labeta, H. Festenstein. - In: JOURNAL OF IMMUNOGENETICS. - ISSN 0305-1811. - 16:4-5(1989), pp. 373-380.

Functional studies of H-2k-like epitopes on DTIC treated and untreated L1210 (H-2d) clones

O. Marelli;
1989

Abstract

Following 'in vivo' treatment with 5-(3-3'-dimethyl-1-triazeno)imidazole-4-carboxamide (DTIC), murine leukemic cells acquire new antigenic specificities not detectable on parental cells and responsible for the rejection of the tumour by syngeneic hosts. 'In vivo' and 'in vitro' experiments pointed out an immunological cross reactivity between DTIC treated and untreated lines. Furthermore, specific CTLs raised against DTIC treated L1210 tumour cells (H-2d) were cytotoxic for H-2k target cells. The aim of this study is to investigate whether the H-2k cross reactivity displayed by L1210/DTIC is related to the drug treatment rather than due to an antigen already present in the parental line and maintained after treatment. Cloned cells from L1210, obtained by limiting dilution 'in vitro', were recloned 'in vivo' and then treated with DTIC. Syngeneic and allogeneic CTLs raised 'in vitro' against parental and treated clones showed lytic activity against H-2k target cells. Treated and untreated clones were then checked for the presence of H-2k-like determinants using monoclonal antibodies. One of these, HB-53 (IgG2bKkDk) was highly positive with all the clones tested in binding assay using iodinated Fab anti-mouse Ig, fluorescence and FACS analysis. Others displayed a low reactivity against both treated and untreated clones without significant differences. After neuraminidase treatment of two clones (D and D/DTIC), the H-100.5 (anti H-2Kk)-reactive epitope was dramatically exposed on the DTIC tumour cells but not on the parental clones. These data suggest that the H-2k cross reactivity is related to the presence of a TAA that is maintained after treatment.(ABSTRACT TRUNCATED AT 250 WORDS)
Neoplasm Transplantation ; Clone Cells ; Cytotoxicity, Immunologic ; Animals ; H-2 Antigens ; Dacarbazine ; Tumor Cells, Cultured ; Mice, Inbred C57BL ; Mice, Inbred C3H ; Mice ; Mice, Inbred DBA ; Leukemia L1210
Settore BIO/14 - Farmacologia
JOURNAL OF IMMUNOGENETICS
Article (author)
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/186824
Citazioni
  • ???jsp.display-item.citation.pmc??? 0
  • Scopus 0
  • ???jsp.display-item.citation.isi??? ND
social impact