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Abstract
The mixed lymphocyte culture when carried out in two stages (discriminative mixed
lymphocyte culture—DMLC) can differentiate between cytotoxic vs. blocking antibody.
We have employed the DMLC to predict by an in vitro assay at what point a state of
in vivo enhancement had occurred. Dogs undergoing unmodified rejection of heterotopic
renal allografts rejected their kidneys in five to nine days. Following rejection
cytotoxic antibody could be detected both by microlymphocytotoxicity testing and by
nonreversible blocking of the DMLC assay. The DMLC predicted the presence of cytotoxic
antibody weeks after the microlymphocytotoxicity assay was no longer positive. Transplants
from the donor of the first kidney, if carried out during this time interval, were
rejected in less than six days. Approximately two months following transplantation
the DMLC assay became reversible. Kidney transplants from the original donor performed
during this time interval were not rejected before ten days. Column chromatography
isolated an active immunoglobulin component responsible for the in vitro blocking
in the IgG fraction. A means of prospectively predicting in vivo enhancement may be
at hand.
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Article info
Footnotes
☆Supported by National Institutes of Health Grant No. CA 14459-01.
☆☆Presented at the Thirty-fourth Annual Meeting of the Society of University Surgeons, New Orleans, La., Feb. 8–10, 1973.
Identification
Copyright
© 1973 Published by Elsevier Inc.