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Primary and Secondary Autoimmune Neutropenia Franco Capsoni1, Piercarlo Sarzi-Puttini2 and Alberto Zanella3

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Primary and Secondary Autoimmune Neutropenia Franco Capsoni1, Piercarlo Sarzi-Puttini2 and Alberto Zanella3 Arthritis Research & Therapy October 2005 Vol 7 No 5 Capsoni et al. Review Primary and secondary autoimmune neutropenia Franco Capsoni1, Piercarlo Sarzi-Puttini2 and Alberto Zanella3 1Rheumatology Unit, Istituto Ortopedico Galeazzi, University of Milan, Milan, Italy 2Rheumatology Unit, Ospedale L Sacco, University of Milan, Milan, Italy 3Hematology Unit, Ospedale Maggiore Policlinico, Fondazione IRCCS, University of Milan, Milan, Italy Corresponding author: Franco Capsoni, [email protected] Published: 31 August 2005 Arthritis Research & Therapy 2005, 7:208-214 (DOI 10.1186/ar1803) This article is online at http://arthritis-research.com/content/7/5/208 © 2005 BioMed Central Ltd Abstract infective diathesis in a neutropenic patient: the speed of Antineutrophil antibodies are well recognized causes of onset and the duration of the neutropenia, the bone marrow neutropenia, producing both quantitative and qualitative defects in myeloid reserves, the absolute circulating monocyte count neutrophils and increased risk for infection. In primary autoimmune and the functional status of phagocytes. neutropenia (AIN) of infancy, a moderate to severe neutropenia is the sole abnormality; it is rarely associated with serious infections Immune mediated neutropenias (Table 1) involve a low neutro- and exhibits a self-limited course. Chronic idiopathic neutropenia of phil count resulting from increased peripheral destruction due adults is characterized by occurrence in late childhood or adulthood, greater prevalence among females than among males, to antibodies directed against the cell membrane antigens. and rare spontaneous remission. Secondary AIN is more The field of immune mediated neutropenias includes various commonly seen in adults and underlying causes include collagen conditions such as alloimmune neutropenias (caused by disorders, drugs, viruses and lymphoproliferative disorders. In most maternal–fetal incompatibility or transfusion reactions) and patients with AIN, antibodies recognize antigens located on the true autoimmune forms. This review focuses on the true IgG Fc receptor type 3b but other target antigens have been autoimmune forms, which may be primary (i.e. not associated recently identified in secondary AIN. Granulocyte colony- stimulating factor is a proven treatment in patients with AIN of all with other pathologies) or secondary (usually to autoimmune types and is now preferred to other possible therapies. or haematological diseases). Introduction Autoimmune neutropenias: pathogenesis and The term ‘neutropenia’ is used to define a condition in which diagnostic tests circulating neutrophils number less than 1500/µl. Neutro- The first convincing evidence that antineutrophil auto- penias can be classified according to the mechanism of antibodies could cause neutropenia was presented in 1975, induction, and so there are forms due to decreased when Boxer and coworkers [1] described five cases caused production of neutrophils, to sequestering of neutrophils from by antineutrophil antibodies that facilitated phagocytosis of endothelial or tissue pools, and to increased peripheral opsonized neutrophils by splenic macrophages, and altered destruction of neutrophils. It is perhaps more useful for some functional features of neutrophils. In the same year, purposes of differential diagnosis to distinguish between Lalezari and coworkers [2] showed that, to some extent, congenital and acquired forms, the latter being subdivided autoantibodies could cause chronic neutropenia. Earlier according to their pathogenesis or aetiological agent experiments conducted by Lawrence and coworkers [3] and (Table 1). Simpson and Ross [4] had already demonstrated the importance of antineutrophil autoantibodies in causing Regardless of the cause, the clinical result of neutropenia is neutropenia; those investigators showed that infusion into always an increased infective diathesis, with frequency and guinea pigs of rabbit anti-guinea-pig neutrophil antibodies severity that are directly proportional to the degree of caused neutropenia, as a result of phagocytosis of opsonized neutropenia. This is considered mild when the neutrophil neutrophils by splenic and bone marrow macrophages. In count is between 1000 and 1500/µl, moderate when it is humans autoantibodies also play a major opsonizing role – between 500 and 1000/µl, and severe when it is less than possibly the main one – in inducing autoimmune neutropenia 500/µl. Other factors may influence the severity of the (AIN) [1,5]. AIN = autoimmune neutropenia; FasL = Fas ligand; FcγR = Fcγ receptor; G-CSF = granulocyte colony-stimulating factor; GIFT = granulocyte 208 immunofluorescence test; HNA = human neutrophil antigen; LGL = large granular lymphocyte; SLE = systemic lupus erythematosus. Available online http://arthritis-research.com/content/7/5/208 Table 1 limitations help to account for the different percentages of patients positive for antineutrophil autoantibodies reported in Classification of neutropenia case series of AIN. No single method can identify all possible Type of antineutrophil autoantibodies [9,10]. The Second Inter- neutropenia Neutropenias national Granulocyte Serology Workshop [11] suggested that a minimum of two methods be used to detect anti- Congenital Severe infantile agranulocytosis (Kostmann’s syndrome) neutrophil autoantibodies: the granulocyte agglutination test Shwachman–Diamond–Oski syndrome and the granulocyte immunofluorescence test (GIFT). The Myelokathexis/neutropenia with tetraploid nuclei granulocyte agglutination test is used to check whether a Cyclic neutropenia Chediak–Higashi syndrome serum sample sensitizes and therefore agglutinates control Reticular dysgenesis neutrophils. The main limitation of this test is that neutrophils Dyskeratosis congenita tend to agglutinate spontaneously. The direct GIFT detects autoantibodies bound to patient’s neutrophils, using Acquired Postinfectious neutropenia fluorescinated human anti-immunoglobulin antibodies. The Drug-induced neutropenia Complement activation (haemodialysis, leukapheresis, test suffers from the difficulty of obtaining enough cells from a ARDS) neutropenic patient; furthermore, considerable observer Immune neutropenia experience is required to recognize the autofluorescence Isoimmune neonatal neutropenia typical of activated neutrophils, and because of the false- Alloimmune neutropenia (transfusion reaction) positive results due to immune complexes bound to Fcγ Autoimmune neutropenia – primary receptor (FcγR)II or FcγRIII and the possible presence of Benign of childhood antineutrophil alloantibodies. Adult chronic form Autoimmune neutropenia – secondary For the indirect GIFT the patient’s serum is placed in contact Autoimmune diseases with control neutrophils, and autoantibodies are then Large granular lymphocyte detected using a fluorescinated human anti-immunoglobulin Other (see Table 3) antiserum. This test also suffers from possible false-positive Pure white cell aplasia Chronic idiopathic neutropenia findings due to immune complexes and antineutrophil Hypersplenism alloantibodies. These methodological difficulties can be overcome by using the MAIGA (monoclonal antibody-specific Nutritional deficiency (vitamin B12 or folate deficiency) Diseases affecting the bone marrow immobilization of granulocyte antigen) assay [12], which uses Postchemotherapy specific monoclonal antibodies to capture neutrophil Aplastic anaemia membrane antigens that have bound human antibodies, thus Fanconi anaemia circumventing the interference from alloantibodies or immune Myelodysplastic syndrome complexes. The assay, which is not routinely available, has Acute and chronic leukaemia been used to identify antibodies against various human ARDS, acute respiratory distress syndrome. neutrophil antigens (HNAs; see below). However, whichever method is selected, it is often difficult to The lack of close relation between the degree of neutropenia detect antineutrophil autoantibodies because they are and the levels of circulating autoantibodies [6] has been present at low titres and bind to their targets with low avidity. attributed to various factors. The additional opsonizing activity It is often necessary to repeat tests several times before it of complement, activated by antineutrophil autoantibodies, may be concluded reliably whether antibodies are present. may amplify phagocytosis [7]. Alternatively, the functional status of the phagocytic system may render clearance of the Primary autoimmune neutropenia opsonized cells more or less effective [6]. Another important The AINs are classified as primary (i.e. not associated with point is that in some cases the capacity of autoantibodies to other detectable pathology) or secondary, in cases in which induce neutropenia is related to their ability to recognize there is another pathology, usually rheumatological (particularly antigenic determinants expressed not only by mature cells Felty’s syndrome and systemic lupus erythematosus [SLE]) or but also by bone marrow myeloid precursors [8]. In such haematological (large granular lymphocyte [LGL] syndrome). cases the severe neutropenia is accompanied by bone marrow hypoplasia, with maturational arrest and a significant Primary autoimmune forms are the most frequent in new- infective diathesis. borns, with an incidence of 1/100,000 [9,10,13], and are usually diagnosed during the first few months (5–15 months). From the diagnostic point of view, the various methods for Although there is significant neutropenia at presentation detecting
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