title: Expression of beta-2-integrins and L-selectin by leukocytes and changes in acute-phase reactants in total hip replacement surgery.
abstract: The aim of this study was to characterize the changes in the quantitative expression of beta 2-integrins and L-selectin detected by means of fluorochrome-conjugated monoclonal antibodies and flow cytometry on leukocytes in the systemic circulation after a major musculoskeletal trauma, i.e. hip replacement surgery, and to relate these changes to parameters of the acute-phase response [plasma acute-phase reactants (C-reactive protein, CRP, and interleukin-6, IL-6) and parameters of coagulation activation (thrombin-antithrombin III complexes, TAT)]. Eight patients with either primary or secondary osteoarthritis of the hip received uncemented total hip prostheses. LFA-1 (CD11a/CD18) was upregulated on granulocytes during the operation. MAC-1 (CD11b/CD18) expression on monocytes increased to peak levels 20 h after surgery, whereas the L-selectin (CD62L) expression on monocytes and granulocytes reached peak values at the end of surgery. The changes in expression of LFA-1 on monocytes, MAC-1 on granulocytes and p150,95 (CD11c/CD18) on monocytes and granulocytes during and after the operation did not reach statistical significance. TAT and IL-6 increased during surgery and reached peak values at the end of the operation and 20 h after surgery, respectively. In contrast, CPR concentrations increased after surgery with peak levels 44 h postoperatively. Significant upregulation of LFA-1 on granulocytes and L-selectin on monocytes and granulocytes preceded the increase in IL-6 which again preceded the increase in CRP. However, the up- or downregulation of leukocyte beta 2-integrins and L-selectin during and after surgery was not significantly correlated with the increase in IL-6. The increases in TAT correlated well with the upregulation of L-selectin on monocytes, but not with the beta 2-integrins known to participate in the coagulation process in vitro. The rise in CRP was inversely correlated with the maximal increase in expression of MAC-1 on monocytes. In conclusion, the changes in leukocyte adhesion molecules during and after surgery indicate changes in critical leukocyte functions. The lack of correlation between quantitative up- and downregulation of leukocyte beta 2-integrins and parameters of the acute phase response suggests that these processes are regulated through independent pathways or that functional up- and downregulation of adhesion molecules, shedding, leukocyte-endothelial adhesion and mobilization of new unactivated cells may result in a net estimate of leukocyte activation not suspected to be positively correlated to acute-phase reactants.
authors: Research Forum, Ullevål University Hospital, Oslo, Norway.
authors: H E
authors: HE
authors: Høgevold
authors: T
authors: T
authors: Lyberg
authors: H
authors: H
authors: Kähler
authors: O
authors: O
authors: Reikerås
mesh_terms: D000209:Acute-Phase Proteins / Q000378:metabolism*; D000328:Adult; D000368:Aged; D000990:Antithrombin III / Q000032:analysis; D002097:C-Reactive Protein / Q000032:analysis; D018821:CD18 Antigens / Q000378:metabolism*; D015815:Cell Adhesion Molecules / Q000378:metabolism; D005260:Female; D006098:Granulocytes / Q000378:metabolism; D006622:Hip Prosthesis; D006801:Humans; D015850:Interleukin-6 / Q000097:blood; D019041:L-Selectin / Q000378:metabolism*; D007958:Leukocyte Count; D007962:Leukocytes / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D010447:Peptide Hydrolases / Q000032:analysis; D011184:Postoperative Period
chemical_list: D000209:Acute-Phase Proteins; D018821:CD18 Antigens; D015815:Cell Adhesion Molecules; D015850:Interleukin-6; C046193:antithrombin III-protease complex; D019041:L-Selectin; D000990:Antithrombin III; D002097:C-Reactive Protein; D010447:Peptide Hydrolases