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Impaired production of interleukin-2 after surgery
Abstract:
The capacity of peripheral blood mononuclear cells (PBM) to produce interleukin-2 (IL-2) was studied serially before and following operation in patients undergoing various surgical procedures. In patients who had major surgery, significant decrease in IL-2 activity was observed 1, 3 and 6 days after operation as compared to that before surgery, although there was no significant change throughout the post-operative course in patients undergoing minor surgery. IL-2 activity returned to the pre-operative level by the 8th post-operative day. However, it remained significantly depressed 8 days after surgery in patients who had undergone major surgical procedures of more increasing severity. Distribution of T cell subsets, especially OKT4 positive cells, did not differ significantly from the pre-operative value throughout the post-operative course. However, the depressed production of IL-2 3 days after surgery could be abolished when adherent cells were removed from PBM by plastic adherence procedures. These results indicated that adherent cells, but not quantitative change in T cell subsets, might be responsible for the depression of IL-2 production after surgery.
Insights
Major surgery temporarily reduces interleukin-2 (IL-2) production by peripheral blood mononuclear cells (PBM). This decrease is linked to adherent cells, not T cell subset changes, and resolves by 8 days post-operation for less severe cases.
Area of Science:
- Immunology
- Surgical Research
- Cellular Biology
Background:
- Interleukin-2 (IL-2) is crucial for T cell function.
- Surgical procedures can impact immune responses.
- The specific mechanisms of post-operative immune modulation require further elucidation.
Purpose of the Study:
- To investigate the serial changes in IL-2 production by peripheral blood mononuclear cells (PBM) after surgery.
- To determine the role of T cell subsets and adherent cells in post-operative IL-2 depression.
- To differentiate the effects of major versus minor surgical procedures on IL-2 production.
Main Methods:
- Serial measurement of IL-2 production in PBM before and after various surgical procedures.
- Analysis of T cell subset distribution (e.g., OKT4 positive cells).
- Assessment of IL-2 production after removing adherent cells from PBM using plastic adherence.
Main Results:
- Major surgery led to a significant decrease in IL-2 activity 1, 3, and 6 days post-operation.
- IL-2 levels returned to baseline by day 8 for minor surgery but remained depressed after major surgery.
- Depressed IL-2 production post-surgery was normalized by removing adherent cells, indicating their involvement.
- No significant changes in T cell subset distribution were observed throughout the post-operative period.
Conclusions:
- Adherent cells, rather than quantitative changes in T cell subsets, are implicated in the post-operative depression of IL-2 production.
- The severity of the surgical procedure correlates with the duration of IL-2 production impairment.
- Understanding these mechanisms could inform strategies to support immune recovery after surgery.