The frequency of B cells secreting antibodies against donor MHC antigens in rats rejecting renal allografts.
We have estimated the frequency of B cells secreting antibodies against donor MHC antigens in rats rejecting histoincompatible renal allografts. In a major plus minor antigen-incompatible DA-to-WF combination on day 4 post-transplantation, reverse protein A plaque assay demonstrated that in the graft the frequency of lymphoid cells secreting Ig was 1:850. A major locus-incompatible and minor locus-compatible, congeneic LBN-to-Lewis strain combination was then applied to estimate the specificity of the secreted antibody. The lymphoid inflammatory cells were fused with mouse myeloma cells, cultured under limiting dilution conditions, and assayed by ELISA to donor and irrelevant strain spleen cells. Among cells infiltrating the graft, the fusion frequency was 1:172 x 10(3) and the frequency of Ig-producing hybrids 1:400 x 10(3) (i.e., this assay was approximately three log orders less sensitive than the reverse pA assay). The frequency of hybridomas secreting specifics antibodies against donor MHC antigens was 1:720 x 10(3) (i.e., every second hybridoma deriving from inflammatory population produced specific Ig). In addition, there was at least one obviously polyspecific population of hybridomas, detectable only in the spleen and reactive with all rat strains tested with a frequency of 1:700 x 10(3). The inflammatory cells were also cultured directly under limiting dilution conditions, and the frequency of Ig-secreting cells was determined by ELISA. The frequency of inflammatory lymphocytes secreting detectable amounts of immunoglobulin in the supernatant was 1:14 x 10(3) in the graft (i.e., this assay was approximately one log order less sensitive than the reverse protein A plaque assay).(ABSTRACT TRUNCATED AT 250 WORDS)
Tiisala
S
S
Transplantation Laboratory, University of Helsinki, Finland.
Leszczynski
D
D
Halttunen
J
J
Nemlander
A
A
Paavonen
T
T
Renkonen
R
R
Häyry
P
P
D000818:Animals; D000921:Antibody-Producing Cells / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology*; D006084:Graft Rejection / Q000276:immunology*; D007518:Isoantibodies / Q000378:metabolism*; D016030:Kidney Transplantation / Q000009:adverse effects / Q000276:immunology*; D051381:Rats; D011919:Rats, Inbred Strains; D014184:Transplantation, Homologous
D007518:Isoantibodies