As a measure of neutrophil activation, we assessed the expression of adhesion molecules and degranulation markers on the cell surface of neutrophils in whole blood samples of trauma patients. Neutrophil CD11b expression in the NS group was significantly upregulated compared to values of healthy controls (Fig. 2A). CD11b expression in patients treated with HS was significantly lower compared to the NS group. In fact, throughout the observation period, values in the HS group did not differ from healthy controls. In the HSD group, only initial CD11b values at admission were lower than in the NS group. While neutrophil activation results in increased CD11b expression, L-selectin (CD62L) expression decreases because of a process termed L-selecting shedding. In the HSD and NS groups, but not the HS group, we found evidence of L-selectin shedding on admission with CD62L expression levels that were significantly lower than in healthy controls (Fig. 2B). Interestingly, in the patients treated with HSD, L selectin shedding was, most pronounced with CD62L expression values remaining significantly lower compared to the NS group (Table 2). Taken together with the CD11b expression data, these findings suggest a higher degree of neutrophil activation in the HSD group compared to the HS group.
As a measure of neutrophil activation, we assessed the expression of adhesion molecules and degranulation markers on the cell surface of neutrophils in whole blood samples of trauma patients. Neutrophil CD11b expression in the NS group was significantly upregulated compared to values of healthy controls (Fig. 2A). CD11b expression in patients treated with HS was significantly lower compared to the NS group. In fact, throughout the observation period, values in the HS group did not differ from healthy controls. In the HSD group, only initial CD11b values at admission were lower than in the NS group. While neutrophil activation results in increased CD11b expression, L-selectin (CD62L) expression decreases because of a process termed L-selecting shedding. In the HSD and NS groups, but not the HS group, we found evidence of L-selectin shedding on admission with CD62L expression levels that were significantly lower than in healthy controls (Fig. 2B). Interestingly, in the patients treated with HSD, L selectin shedding was, most pronounced with CD62L expression values remaining significantly lower compared to the NS group (Table 2). Taken together with the CD11b expression data, these findings suggest a higher degree of neutrophil activation in the HSD group compared to the HS group.
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