Meert KL, Ofenstein JP, Genyea C, Sarnaik AP, Kaplan J. Elevated transforming growth factor-beta concentration correlates with posttrauma immunosuppression.
THE JOURNAL OF TRAUMA 1996;
40:901-6. [PMID:
8656475 DOI:
10.1097/00005373-199606000-00007]
[Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
OBJECTIVE
To determine whether trauma induces an increase in the concentration of circulating transforming growth factor-beta (TGF-beta), and whether there is a temporal correlation between plasma TGF-beta concentration and the development of posttrauma cellular immunosuppression.
MATERIALS AND METHODS
Male Sprague-Dawley rats were anesthetized, subjected to bilateral femur fractures or sham injury, and killed 1, 3, or 5 days later. Plasma TGF-beta levels, splenocyte phenotypes, mitogen-induced proliferation, interleukin-2 (IL-2) production, and IL-2 receptor (IL-2R) expression were determined at each time point.
MEASUREMENTS AND MAIN RESULTS
Splenocyte proliferation increased on day 1 postinjury without corresponding change in IL-2 or plasma TGF-beta levels. Splenocyte proliferation and IL-2 production were suppressed on day 3 postinjury, while plasma TGF-beta levels peaked. No differences were observed between trauma and control groups on day 5. Splenocyte phenotypes and IL-2R expression were similar in injured and control rats at all times.
CONCLUSIONS
Suppression of lymphocyte proliferation and IL-2 production after trauma occurs concomitantly with a rise in plasma TGF-beta. The immune response is restored with normalization of TGF-beta concentration. These observations suggest that TGF-beta may contribute to posttrauma immunosuppression.
Collapse