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. 1982 Sep;196(3):297–304. doi: 10.1097/00000658-198209000-00008

Depressed immune response in burn patients: use of monoclonal antibodies and functional assays to define the role of suppressor cells.

A J McIrvine, J B O'Mahony, I Saporoschetz, J A Mannick
PMCID: PMC1352602  PMID: 6214221

Abstract

Recent experimental evidence has suggested that circulating suppressor leukocytes play an important role in mediating the suppression of immunity seen in burn patients. In order to shed further light on the relationship between suppressor cells and depressed cellular immunity 22 patients were studied (mean age 37) who had suffered severe burns of greater than 30% body surface area. Simultaneous studies were performed on 14 control laboratory personnel (mean age 32). Monoclonal antibodies were used to identify T-lymphocyte subsets known to have suppressor/cytotoxic (OKT8) and helper/inducer (OKT4) function, respectively. In addition, serial measurements were made of the response of circulating lymphocytes to the T-cell mitogen phytohemagglutinin (PHA). An inversion of the normal ratio between suppressor/cytotoxic and helper/inducer subsets (normal 0.55:1, postburn 1.4:1; p less than 0.001) occurred soon after burn injury, reached a peak in five to seven days and then returned gradually to normal levels by 14 days. A diminished response of patients' lymphocytes to PHA (57 +/- 10% SD suppression as compared with normal controls at five to seven days) corresponded with high suppressor to helper cell ratios and returned to normal at the same time. Functional assays, which recognize only high levels of activity, demonstrated circulating suppressor cells in nine patients during this same period but became negative by 14 days. These early immunologic modulations were not predictive of morbidity or mortality. Later in the postburn course, systemic sepsis in eight patients was associated with a return of increased suppressor to helper cell ratios and decreased mitogen (PHA) responsiveness. At this time functional assays demonstrated circulating suppressor cells in six patients. Five of these six patients died of sepsis. It was concluded that severe burn injury regularly induces an early transient increase in circulating suppressor cells accompanied by a depression of lymphocyte activation. A later (greater than 14 days postburn) increase in suppressor cells to levels detectable by functional assays is closely correlated with mortality from sepsis.

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Selected References

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