Cell activation state influences the modulation of HLA-DR surface expression on human monocytes/macrophages by parenteral fish oil lipid emulsion

Autor(es)

Torrinhas, R. S. ^[1] ; Jacintho, T. ^[1] ; Goto, H. ^[1] ; Gidlund, M. ^[1] ; Sales, M. M. ^[1] ; Oliveira, P. A. ^[1] ; Waitzberg, D. L. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sch Med, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: NUTRICION HOSPITALARIA; v. 26, n. 2, p. 311-316, MAR-APR 2011.
• Citações Web of Science: 1

Resumo

Abnormal surface expression of HLA-DR by leukocytes is associated with a poor prognosis in critical care patients. Critical care patients often receive total parenteral nutrition with lipid emulsion (LE). In this study we evaluated the influence of fish oil LE (FO) on human monocyte/macrophage (Mφ) expression of surface HLA-DR under distinct activation states. Mononuclear leukocytes from the peripheral blood of healthy volunteers (n=18) were cultured for 24 hours without LE (control) or with 3 different concentrations (0.1, 0.25, and 0.5%) of the follow LE: a) pure FO b) FO in association (1:1-v/v) with LE composed of 50% medium-chain trygliceride and 50% soybean oil (MCTSO), and c) pure MCTSO. The leukocytes were also submitted to different cell activation states, as determinate by addition time: no INF-γ addition, 18 hours before, or at the time of LE addition. HLA-DR expression on Mφ surface was evaluated by flow cytometry using specific monoclonal antibodies. In relation to controls (for 0.1%, 0.25%, and 0.5%: 100) FO decreased the expression of HLA-DR when added alone [in simultaneously-activated Mφ, for 0.1%: 70 (59 ± 73); for 0.25%: 51 (48 ± 56); and for 0.5%: 52.5 (50 ± 58)] or in association with MCTSO [in simultaneously-activated Mφ, for 0.1%: 50.5 (47 ± 61); for 25%: 49 (45 ± 52); and for 0.5%: 51 (44 ± 54) and in previously-activated Mf, for 1.0%: 63 (44 ± 88); for 0.25%: 70 (41 ± 88); and for 0.5%: 59.5 (39 ± 79)] in culture medium (Friedman p < 0.05). In relation to controls (for 0.1%, 0.25%, and 0.5%: 100), FO did not influence the expression of these molecules on non-activated Mφ [for 0.1%: 87.5 (75±93); for 0.25%: 111 (98 ± 118); and for 0.5%: 101.5 (84 ± 113)]. Results show that parenteral FO modulates the expression of HLA-DR on human Mφ surface accordingly to leukocyte activation state. Further clinical studies evaluating the ideal moment of fish oil LE infusion to modulate leukocyte functions may contribute to a better understanding of its immune modulatory properties. (AU)

• Processo FAPESP: 98/11379-9 - Impacto das emulsoes lipidas sobre a expressao de moleculas de superficie de monocitos/macrofagos humanos.
• Beneficiário: Raquel Susana Matos de Miranda Torrinhas
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 99/08332-3 - Impacto das emulsoes lipidicas sobre a expressao de moleculas de superficie de monocitos/macrofagos humanos.
• Beneficiário: Dan Linetzky Waitzberg
• Modalidade de apoio: Auxílio à Pesquisa - Regular