THE ABL-MYC RETROVIRUS GENERATES ANTIGEN-SPECIFIC PLASMACYTOMAS BY IN-VITRO INFECTION OF ACTIVATED B-LYMPHOCYTES FROM SPLEEN AND OTHER MURINE LYMPHOID ORGANS
Da. Largaespada et al., THE ABL-MYC RETROVIRUS GENERATES ANTIGEN-SPECIFIC PLASMACYTOMAS BY IN-VITRO INFECTION OF ACTIVATED B-LYMPHOCYTES FROM SPLEEN AND OTHER MURINE LYMPHOID ORGANS, Journal of immunological methods, 197(1-2), 1996, pp. 85-95
ABL-MYC is a recombinant retrovirus that constitutively expresses the
v-abl and c-myc oncogenes. When used to infect immunized mice this vir
us rapidly and efficiently induces plasmacytomas of which an unusually
high percentage secrete antigen (Ag)-specific monoclonal antibodies.
These findings suggested that ABL-MYC targets Ag-stimulated B cells fo
r transformation and that infection of lymphoid cells in vitro might b
e a useful, alternative method for generating monoclonal, Ag-specific
plasmacytomas (ASPCTs). Therefore, we used helper virus-free ABL-MYC t
o infect suspensions of cells from spleens and other lymphoid organs f
rom mice that had been immunized with a variety of Ags and transplante
d them into naive mice. The results show that ABL-MYC preferentially t
ransforms splenocytes that are AE-reactive. They also demonstrate that
ASPCTs can be produced by in vitro infection of cell suspensions from
the spleen, lymph nodes and Peyer's patches of mice that had been imm
unized intraperitoneally with sheep red blood cells, Escherichia coli
core RNA polymerase or Epstein-Barr virus gp340 protein or immunized o
rally with live Giardia lamblia parasites. The ASPCTs usually consiste
d of one to three clones, secreted antibodies that were quantitatively
and qualitatively similar to those obtained from hybridomas, and coul
d continue to secrete Ag-reactive antibody over eight transplant gener
ations.