Fcγ receptor expression on splenic macrophages in adult immune thrombocytopenia

Summary Splenic macrophages play a key role in immune thrombocytopenia (ITP) pathogenesis by clearing opsonized platelets. Fcγ receptors (FcγR) participate in this phenomenon, but their expression on splenic macrophages and their modulation by treatment have scarcely been studied in human ITP. We ai...

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Veröffentlicht in:Clinical and experimental immunology 2017-05, Vol.188 (2), p.275-282
Hauptverfasser: Audia, S., Santegoets, K., Laarhoven, A. G., Vidarsson, G., Facy, O., Ortega‐Deballon, P., Samson, M., Janikashvili, N., Saas, P., Bonnotte, B., Radstake, T. R.
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container_end_page 282
container_issue 2
container_start_page 275
container_title Clinical and experimental immunology
container_volume 188
creator Audia, S.
Santegoets, K.
Laarhoven, A. G.
Vidarsson, G.
Facy, O.
Ortega‐Deballon, P.
Samson, M.
Janikashvili, N.
Saas, P.
Bonnotte, B.
Radstake, T. R.
description Summary Splenic macrophages play a key role in immune thrombocytopenia (ITP) pathogenesis by clearing opsonized platelets. Fcγ receptors (FcγR) participate in this phenomenon, but their expression on splenic macrophages and their modulation by treatment have scarcely been studied in human ITP. We aimed to compare the phenotype and function of splenic macrophages between six controls and 24 ITP patients and between ITP patients according to the treatments they received prior to splenectomy. CD86, human leucocyte antigen D‐related (HLA‐DR) and FcγR expression were measured by flow cytometry on splenic macrophages. The major FcγR polymorphisms were determined and splenic macrophage function was assessed by a phagocytosis assay. The expression of the activation markers CD86 and HLA‐DR was higher on splenic macrophages during ITP compared to controls. While the expression of FcγR was not different between ITP and controls, the phagocytic function of splenic macrophages was reduced in ITP patients treated with intravenous immunoglobulin (IVIg) within the 2 weeks prior to splenectomy. The FCGR3A (158V/F) polymorphism, known to increase the affinity of FcγRIII to IgG, was over‐represented in ITP patients. Thus, these are the first results arguing for the fact that the therapeutic use of IVIg during human chronic ITP does not modulate FcγR expression on splenic macrophages but decreases their phagocytic capabilities. The expression of activator and inhibitory Fcgamma receptors on splenic macrophages is not imbalance during immune thrombocytopenia. Most particularly, IVIg given within the two weeks prior to splenectomy do not increase the expression of the inhibitory receptor FcgammaRIIb.
doi_str_mv 10.1111/cei.12935
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G. ; Vidarsson, G. ; Facy, O. ; Ortega‐Deballon, P. ; Samson, M. ; Janikashvili, N. ; Saas, P. ; Bonnotte, B. ; Radstake, T. R.</creator><creatorcontrib>Audia, S. ; Santegoets, K. ; Laarhoven, A. G. ; Vidarsson, G. ; Facy, O. ; Ortega‐Deballon, P. ; Samson, M. ; Janikashvili, N. ; Saas, P. ; Bonnotte, B. ; Radstake, T. R.</creatorcontrib><description>Summary Splenic macrophages play a key role in immune thrombocytopenia (ITP) pathogenesis by clearing opsonized platelets. Fcγ receptors (FcγR) participate in this phenomenon, but their expression on splenic macrophages and their modulation by treatment have scarcely been studied in human ITP. We aimed to compare the phenotype and function of splenic macrophages between six controls and 24 ITP patients and between ITP patients according to the treatments they received prior to splenectomy. CD86, human leucocyte antigen D‐related (HLA‐DR) and FcγR expression were measured by flow cytometry on splenic macrophages. The major FcγR polymorphisms were determined and splenic macrophage function was assessed by a phagocytosis assay. The expression of the activation markers CD86 and HLA‐DR was higher on splenic macrophages during ITP compared to controls. While the expression of FcγR was not different between ITP and controls, the phagocytic function of splenic macrophages was reduced in ITP patients treated with intravenous immunoglobulin (IVIg) within the 2 weeks prior to splenectomy. The FCGR3A (158V/F) polymorphism, known to increase the affinity of FcγRIII to IgG, was over‐represented in ITP patients. Thus, these are the first results arguing for the fact that the therapeutic use of IVIg during human chronic ITP does not modulate FcγR expression on splenic macrophages but decreases their phagocytic capabilities. The expression of activator and inhibitory Fcgamma receptors on splenic macrophages is not imbalance during immune thrombocytopenia. 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G.</creatorcontrib><creatorcontrib>Vidarsson, G.</creatorcontrib><creatorcontrib>Facy, O.</creatorcontrib><creatorcontrib>Ortega‐Deballon, P.</creatorcontrib><creatorcontrib>Samson, M.</creatorcontrib><creatorcontrib>Janikashvili, N.</creatorcontrib><creatorcontrib>Saas, P.</creatorcontrib><creatorcontrib>Bonnotte, B.</creatorcontrib><creatorcontrib>Radstake, T. R.</creatorcontrib><title>Fcγ receptor expression on splenic macrophages in adult immune thrombocytopenia</title><title>Clinical and experimental immunology</title><addtitle>Clin Exp Immunol</addtitle><description>Summary Splenic macrophages play a key role in immune thrombocytopenia (ITP) pathogenesis by clearing opsonized platelets. Fcγ receptors (FcγR) participate in this phenomenon, but their expression on splenic macrophages and their modulation by treatment have scarcely been studied in human ITP. We aimed to compare the phenotype and function of splenic macrophages between six controls and 24 ITP patients and between ITP patients according to the treatments they received prior to splenectomy. CD86, human leucocyte antigen D‐related (HLA‐DR) and FcγR expression were measured by flow cytometry on splenic macrophages. The major FcγR polymorphisms were determined and splenic macrophage function was assessed by a phagocytosis assay. The expression of the activation markers CD86 and HLA‐DR was higher on splenic macrophages during ITP compared to controls. While the expression of FcγR was not different between ITP and controls, the phagocytic function of splenic macrophages was reduced in ITP patients treated with intravenous immunoglobulin (IVIg) within the 2 weeks prior to splenectomy. The FCGR3A (158V/F) polymorphism, known to increase the affinity of FcγRIII to IgG, was over‐represented in ITP patients. 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R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Fcγ receptor expression on splenic macrophages in adult immune thrombocytopenia</atitle><jtitle>Clinical and experimental immunology</jtitle><addtitle>Clin Exp Immunol</addtitle><date>2017-05</date><risdate>2017</risdate><volume>188</volume><issue>2</issue><spage>275</spage><epage>282</epage><pages>275-282</pages><issn>0009-9104</issn><eissn>1365-2249</eissn><abstract>Summary Splenic macrophages play a key role in immune thrombocytopenia (ITP) pathogenesis by clearing opsonized platelets. Fcγ receptors (FcγR) participate in this phenomenon, but their expression on splenic macrophages and their modulation by treatment have scarcely been studied in human ITP. We aimed to compare the phenotype and function of splenic macrophages between six controls and 24 ITP patients and between ITP patients according to the treatments they received prior to splenectomy. CD86, human leucocyte antigen D‐related (HLA‐DR) and FcγR expression were measured by flow cytometry on splenic macrophages. The major FcγR polymorphisms were determined and splenic macrophage function was assessed by a phagocytosis assay. The expression of the activation markers CD86 and HLA‐DR was higher on splenic macrophages during ITP compared to controls. While the expression of FcγR was not different between ITP and controls, the phagocytic function of splenic macrophages was reduced in ITP patients treated with intravenous immunoglobulin (IVIg) within the 2 weeks prior to splenectomy. The FCGR3A (158V/F) polymorphism, known to increase the affinity of FcγRIII to IgG, was over‐represented in ITP patients. Thus, these are the first results arguing for the fact that the therapeutic use of IVIg during human chronic ITP does not modulate FcγR expression on splenic macrophages but decreases their phagocytic capabilities. 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subjects Adult
Aged
Antigens, CD86
Autoimmune Diseases
Autoimmune Diseases - immunology
Autoimmune Diseases - surgery
Autoimmune Diseases - therapy
autoimmunity
B7-2 Antigen - analysis
Fc receptors
Female
Flow Cytometry
Humans
Immunoglobulin G
Immunoglobulin G - blood
Immunoglobulins, Intravenous
Immunoglobulins, Intravenous - therapeutic use
Immunology
Life Sciences
Macrophages
Macrophages - immunology
Macrophages - physiology
Male
Middle Aged
Original
Phagocytosis
Phenotype
Polymorphism, Genetic
Receptors, IgG
Receptors, IgG - analysis
Receptors, IgG - genetics
Receptors, IgG - immunology
Spleen
Spleen - cytology
Spleen - immunology
Splenectomy
Thrombocytopenia
Thrombocytopenia - immunology
Thrombocytopenia - surgery
Thrombocytopenia - therapy
title Fcγ receptor expression on splenic macrophages in adult immune thrombocytopenia
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