Meeting abstract | Open | Published:
Selectins in multiple injured patients with severe head trauma
Critical Carevolume 1, Article number: P010 (1997)
High mortality rates days or weeks after multiple injury are often due to multiple organ dysfunction (MODS). Recent studies put a close view to the course of immunological mediators as the members of the selectin family to figure out their contribution to shock, sepsis and organ failure . Brain contusion is supposed to cause cellular infiltrates and inflammation in brain tissue .
P-selectin (CD62P) is stored in endothelial cells (EC) Wiebel-Palade-bodies and in thrombocytes. It is rapidly released after cell activation. E-selectin (CD62E) is expressed on the cell surface of EC and shed from there after IL-1/TNF stimulation. L-selectin (CD62L) can be found on the surface of leukocytes. Cell activation leads to shed L-selectin by proteolytic processes .
We examined soluble E- and P-selectin and L-selectin on B-lymphocytes in multiple injured patients without or with moderate or with severe head injury. The classification of head injury was performed following the injury severity score (ISS) (0-2 pts, moderate; 3-5 pts, severe head injury).
sE-, P- and L-selectin were- measured in 51 multiple injured patients with samples taken on 10 time points (from the location of the accident = 0 h to the 6th post-traumatic day = 144 h) by using commercially available standardized enzyme-linked immunoassays (ELISA). CD62L levels on leukocyte subpopulations were detected using the monoclonal antibodies CD62L (LECAM-1), CD3 (T-cell), CD19 (B-cell), CD14 (monocyte) and a standard flow cytometer.
Table 1 demonstrates the very early increase of sP-selectin in patients with severe head injury (P = 0.0001) compared to those with moderate or no head injury.
Table 2 illustrates the later increase (P = 0.0026) of sL-selectin levels (72 h) in severe head injured individuals while L-selectin on CD19+ B-lymphocytes is expressed significantly stronger (P = 0.0001) in the very early post-traumatic phase (0-24 h) = Table 3.
The gravity of head trauma seems to influence the immunological response and subsequently the cell-cell interactions.
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Supported by the BMVg, Grant InSan 1 0993-V-1296.