Volume 120, Issue 2 pp. 257-265

Overexpression of complement receptors and related antigens on the surface of bone marrow mast cells in patients with systemic mastocytosis

Rosa Núñez-López

Rosa Núñez-López

Mast Cell Unit, Hospital Ramón y Cajal, Madrid, Spain,

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Luis Escribano

Luis Escribano

Mast Cell Unit, Hospital Ramón y Cajal, Madrid, Spain,

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Gerit-Holger Schernthaner

Gerit-Holger Schernthaner

Department of Internal Medicine I, Division of Haematology and Hemostaseology, University of Vienna, Vienna, Austria, and

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Aránzazu Prados

Aránzazu Prados

Mast Cell Unit, Hospital Ramón y Cajal, Madrid, Spain,

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Ramón Rodríguez-González

Ramón Rodríguez-González

Mast Cell Unit, Hospital Ramón y Cajal, Madrid, Spain,

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Beatriz Díaz-Agustín

Beatriz Díaz-Agustín

Mast Cell Unit, Hospital Ramón y Cajal, Madrid, Spain,

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Antonio López

Antonio López

Servicio General de Citometría, Centro de Investigación del Cáncer, Universidad de Salamanca, Salamanca, Spain

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Alexander Hauswirth

Alexander Hauswirth

Department of Internal Medicine I, Division of Haematology and Hemostaseology, University of Vienna, Vienna, Austria, and

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Peter Valent

Peter Valent

Department of Internal Medicine I, Division of Haematology and Hemostaseology, University of Vienna, Vienna, Austria, and

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Julia Almeida

Julia Almeida

Servicio General de Citometría, Centro de Investigación del Cáncer, Universidad de Salamanca, Salamanca, Spain

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Pilar Bravo

Pilar Bravo

Mast Cell Unit, Hospital Ramón y Cajal, Madrid, Spain,

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Alberto Orfao

Alberto Orfao

Servicio General de Citometría, Centro de Investigación del Cáncer, Universidad de Salamanca, Salamanca, Spain

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First published: 24 January 2003
Citations: 42
Dr Alberto Orfao, Servicio General de Citometría, Laboratorio de Hematología, Hospital Clínico, Paseo de San Vicente 58–152, 37007 Salamanca, Spain. E-mail: [email protected]

Abstract

Summary. Depending on their stage of maturation and other factors, mast cell (MC) subsets differ from each other in terms of the expression of complement-associated antigens. This study analysed the expression of various complement-related cell surface antigens (CD11b/CR3, CD11c/CR4, CD35/CR1, CD55/DAF, CD59/MIRL, CD88/C5aR) on bone marrow mast cells (BMMC) in patients suffering from systemic mastocytosis (SM), other haematological diseases and non-haematological disorders (control groups). Expression of complement-associated cell surface antigens was analysed by flow cytometry. There were clear immunophenotypic differences between BMMC obtained from patients with SM and those from the control subjects: the percentage of patients expressing surface CD11c, CD35 and CD88 was significantly higher in patients with SM (76%, 100%, 54%) than in the control subjects (58%, 11%, 18%) (P < 0·05). In addition, the levels of CD11c, CD35 and CD88 expressed per MC (sites per cell) were significantly higher (P < 0·05) in SM than in the control group. Expression of the complement regulatory molecules CD55 and CD59 was detected in BMMC in all patients analysed. However, the levels of CD59 per BMMC were higher in patients with SM as compared with the control subjects, which could help to explain the formation of BMMC aggregates in the former group of individuals. Together, our results showed that BMMC in systemic mastocytosis overexpressed the cell surface membrane receptors involved in binding of complement components and complement-mediated cell activation. Whether this pathological expression of complement receptors is of pathophysiological significance remains to be determined.

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