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Hernandez MM, Buckley A, Mills A, Meislin R, Cromwell C, Bianco A, Strong N, Arinsburg S. Multidisciplinary management of a pregnancy complicated by Glanzmann thrombasthenia: A case report. Transfusion 2023; 63:2384-2391. [PMID: 37952246 DOI: 10.1111/trf.17594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 09/05/2023] [Accepted: 09/05/2023] [Indexed: 11/14/2023]
Abstract
BACKGROUND Glanzmann thrombasthenia (GT) is a rare, autosomal recessive disorder of platelet glycoprotein IIb-IIIa receptors. Pregnant patients with GT are at increased risk of maternal and fetal bleeding. There is a paucity of literature on the peripartum management of patients. CASE DESCRIPTION We present the antepartum through the postpartum course of a patient with GT who was managed by a multidisciplinary approach that included communication across maternal-fetal medicine, hematology, transfusion medicine, and anesthesiology services. In addition to routine prepartum obstetric imaging and hematologic laboratory studies, we proactively monitored the patient for anti-platelet antibodies every 4-6 weeks to gauge the risk for neonatal alloimmune thrombocytopenia. Furthermore, we prioritized uterotonics, tranexamic acid, and transfusion of HLA-matched platelets to manage bleeding for mother and fetus intrapartum through the postpartum periods. CONCLUSION To date, there are limited guidelines for managing bleeding or preventing alloimmunization during pregnancy in patients with GT. Here, we present a complex case with aggressive management of bleeding prophylactically for the mother while serially monitoring both mother and fetus for peripartum bleeding risks and events. Moreover, future studies warrant continued evaluation of these approaches to mitigate increased bleeding risks in subsequent pregnancies.
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Affiliation(s)
- Matthew M Hernandez
- Department of Pathology, Molecular, and Cell-Based Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Ayisha Buckley
- Department of Obstetrics, Gynecology, and Reproductive Medicine, Mount Sinai Hospital, Icahn School of Medicine, New York, New York, USA
| | - Ariana Mills
- Department of Obstetrics, Gynecology, and Reproductive Medicine, Mount Sinai Hospital, Icahn School of Medicine, New York, New York, USA
| | - Rachel Meislin
- Department of Obstetrics, Gynecology, and Reproductive Medicine, Mount Sinai Hospital, Icahn School of Medicine, New York, New York, USA
| | - Caroline Cromwell
- Division of Hematology/Oncology, Department of Medicine, Icahn School of Medicine at Mount, New York, New York, USA
| | - Angela Bianco
- Department of Obstetrics, Gynecology, and Reproductive Medicine, Mount Sinai Hospital, Icahn School of Medicine, New York, New York, USA
| | - Noel Strong
- Department of Obstetrics, Gynecology, and Reproductive Medicine, Mount Sinai Hospital, Icahn School of Medicine, New York, New York, USA
| | - Suzanne Arinsburg
- Department of Pathology, Molecular, and Cell-Based Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA
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ABO Incompatibility between the Mother and Fetus Does Not Protect against Anti-Human Platelet Antigen-1a Immunization by Pregnancy. J Clin Med 2022; 11:jcm11226811. [PMID: 36431288 PMCID: PMC9694632 DOI: 10.3390/jcm11226811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 11/07/2022] [Accepted: 11/16/2022] [Indexed: 11/19/2022] Open
Abstract
(1) Background: ABO blood group incompatibility between the mother and fetus protects against anti-D immunization by pregnancy. The possible role of ABO incompatibility in protecting against anti-human platelet antigen-1a immunization is unclear. (2) Methods: This study retrospectively screened 817 families (mother-father-neonate trios) of suspected fetal and neonatal alloimmune thrombocytopenia for inclusion. ABO genotypes were determined in 118 mother-child pairs with confirmed alloimmune thrombocytopenia due to anti-HPA-1a antibodies, and 522 mother-child pairs served as the control group. The expression of blood group antigen A on platelets was determined in 199 consecutive newborns by flow cytometry and compared with adult controls. (3) Results: ABO incompatibility between mother and fetus did not protect against anti-human platelet antigen-1a immunization by pregnancy. ABO blood groups of mothers and/or fetuses were not associated with the severity of fetal and neonatal alloimmune thrombocytopenia. The expression pattern of blood group A antigens on the platelets of newborns mirrored that of adults, albeit on a lower level. Blood group A antigen was detected on a subpopulation of neonatal platelets, and some newborns revealed high platelet expression of A determinants on all platelets (type II high-expressers). (4) Conclusion: The lack of a protective effect of ABO incompatibility between mother and fetus against anti-human platelet antigen-1a immunization by pregnancy may indicate that fetal platelets are not the cellular source by which the mother is immunized.
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Al-Abdi SY, Al-Omran AM, Shapan HA. Cord Platelet Count of Full-Term Neonates in Relation to ABO Incompatibility and Glucose-6-Phosphate Dehydrogenase Levels: A Retrospective Cohort Study. Cureus 2022; 14:e30284. [PMID: 36407223 PMCID: PMC9654656 DOI: 10.7759/cureus.30284] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/13/2022] [Indexed: 05/28/2023] Open
Abstract
Background The immunoglobulin G of mothers with O blood type may sensitize the platelets of their neonates with A (O-A incompatibility) or B (O-B incompatibility) blood type. As the expression and antigenicity of the B antigen on platelets is less than that of the A antigens, we have hypothesized that platelet count is higher in the O-B incompatibility group compared to the O-A incompatibility group. There is controversy about whether glucose-6-phosphate dehydrogenase (G6PD) deficiency, without evidence of hemolysis, is associated with a lower platelet count than G6PD-normal. Aim To assess whether platelet count is higher in the O-B than in the O-A incompatible neonates and whether it correlates with their G6PD levels. Methods This study was a retrospective cohort study on a sample of 835 healthy neonates born at ≥38 weeks gestation who were either A or B blood types with mothers that carried the blood type O Rh-positive. The platelet count (thousand per microliter) from umbilical cord venous blood (UCVB) was used. A G6PD level of 11.0 units/gram of hemoglobin (U/g Hb) was considered the lower reference limit. G6PD deficiency was defined as a G6PD level of <3.3 U/g Hb in both sexes. Intermediate G6PD deficiency in females was described as a G6PD level of 3.3-8.8 U/g Hb. Results The mean UCVB platelet count was higher in female neonates compared to male neonates (n=389, 283±65 versus n=446, 272±73, p=0.01). The mean UCVB platelet count was higher in the O-B incompatibility group in both male (n=114, 291±82 versus n=103, 266±63) and female neonates (n=83, 303±66 versus n=81, 278±58) with G6PD levels of >8.8 U/g Hb. There was a positive weak correlation between UCVB platelet counts and G6PD levels only in O-B incompatible female neonates (n=176, r=0.23, p=0.002). The partitioning and combined 95% reference intervals (RIs) of the UCVB platelet count were presented. Conclusion The platelet count was higher in the O-B incompatibility group compared to the O-A incompatibility group, but only when the G6PD level was >8.8 U/g Hb. A correlation between UCVB platelet count and G6PD levels was found only among O-B incompatible female neonates. These findings may have an important implication in estimating RIs of the UCVB platelet count, however, they need to be confirmed and explored in future research.
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Kuroishi A, Takihara Y, Hirayama F. Current understanding and future perspectives for anti-human platelet antigen-15 antibodies in patients with alloimmune thrombocytopenia: History, laboratory testing, and clinical impact. Transfusion 2022; 62:1128-1141. [PMID: 35266549 DOI: 10.1111/trf.16845] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2021] [Revised: 02/02/2022] [Accepted: 02/11/2022] [Indexed: 11/30/2022]
Affiliation(s)
- Ayumu Kuroishi
- Laboratory, Japanese Red Cross Kinki Block Blood Center, Ibaraki-shi, Osaka, Japan
| | | | - Fumiya Hirayama
- Japanese Red Cross Kinki Block Blood Center, Ibaraki-shi, Osaka, Japan
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Sachs UJ, Bedei I, Wienzek-Lischka S, Cooper N, Ehrhardt H, Axt-Fliedner R, Bein G. Fetale und neonatale Alloimmunthrombozytopenie, Teil 1. TRANSFUSIONSMEDIZIN 2021. [DOI: 10.1055/a-1258-1238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
ZusammenfassungDie fetale und neonatale Alloimmunthrombozytopenie (FNAIT) wird durch mütterliche Antikörper hervorgerufen, die gegen ein vom Vater ererbtes Blutgruppenmerkmal an fetalen Thrombozyten gerichtet sind. Teil 1 des Beitrags stellt die Ätiologie, die Pathogenese und die Diagnostik der FNAIT dar, während Teil 2 die Risikostratifizierung und Behandlung der FNAIT thematisiert 1.
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Xu X, Xu F, Ying Y, Hong X, Liu Y, Chen S, He J, Zhu F, Hu W. ABO antigen levels on platelets of normal and variant ABO blood group individuals. Platelets 2018; 30:854-860. [DOI: 10.1080/09537104.2018.1543863] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Xianguo Xu
- Blood Center of Zhejiang Province, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Blood Safety Research, Hangzhou, China
| | - Fang Xu
- Blood Center of Zhejiang Province, Hangzhou, China
| | - Yanling Ying
- Blood Center of Zhejiang Province, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Blood Safety Research, Hangzhou, China
| | - Xiaozhen Hong
- Blood Center of Zhejiang Province, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Blood Safety Research, Hangzhou, China
| | - Ying Liu
- Blood Center of Zhejiang Province, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Blood Safety Research, Hangzhou, China
| | - Shu Chen
- Blood Center of Zhejiang Province, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Blood Safety Research, Hangzhou, China
| | - Ji He
- Blood Center of Zhejiang Province, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Blood Safety Research, Hangzhou, China
| | - Faming Zhu
- Blood Center of Zhejiang Province, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Blood Safety Research, Hangzhou, China
| | - Wei Hu
- Blood Center of Zhejiang Province, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Blood Safety Research, Hangzhou, China
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7
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Sullivan MJ, Peterson J, McFarland JG, Bougie D, Aster RH, Curtis BR. A new low-frequency alloantigen (Kha(b) ) located on platelet glycoprotein IIIa as a cause of maternal sensitization leading to neonatal alloimmune thrombocytopenia. Transfusion 2014; 55:1584-5. [PMID: 25494608 DOI: 10.1111/trf.12959] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Revised: 10/10/2014] [Accepted: 10/21/2014] [Indexed: 11/29/2022]
Affiliation(s)
- Mia J Sullivan
- Platelet & Neutrophil Immunology Lab, BloodCenter of Wisconsin, Milwaukee, Wisconsin
| | - Julie Peterson
- Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, Wisconsin
| | - Janice G McFarland
- Platelet & Neutrophil Immunology Lab, BloodCenter of Wisconsin, Milwaukee, Wisconsin.,Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, Wisconsin.,Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Daniel Bougie
- Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, Wisconsin
| | - Richard H Aster
- Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, Wisconsin.,Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Brian R Curtis
- Platelet & Neutrophil Immunology Lab, BloodCenter of Wisconsin, Milwaukee, Wisconsin.,Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, Wisconsin
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8
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Peterson JA, Gitter M, Bougie DW, Pechauer S, Hopp KA, Pietz B, Szabo A, Curtis BR, McFarland J, Aster RH. Low-frequency human platelet antigens as triggers for neonatal alloimmune thrombocytopenia. Transfusion 2014; 54:1286-93. [PMID: 24128174 PMCID: PMC3989475 DOI: 10.1111/trf.12450] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Revised: 08/05/2013] [Accepted: 08/27/2013] [Indexed: 11/30/2022]
Abstract
BACKGROUND Twenty-four low-frequency human platelet antigens (LFHPAs) have been implicated as immunogens in neonatal alloimmune thrombocytopenia (NAIT). We performed studies to define more fully how often these antigens trigger maternal immunization leading to NAIT. STUDY DESIGN AND METHODS In a Phase 1 study, fathers of selected NAIT cases not resolved by serologic testing but thought to have a high likelihood of NAIT on clinical and serologic grounds were typed for LFHPAs by DNA sequencing. In a Phase 2 study, high-throughput methods were used to type fathers of 1067 consecutive unresolved NAIT cases for LFHPAs. Mothers of 1338 unresolved cases were also typed to assess the prevalence of LFHPAs in a population racially/ethnically similar to the fathers. RESULTS In Phase 1, LFHPAs were identified in 16 of 244 fathers (6.55%). In Phase 2, LFPAs were found in only 28 of 1067 fathers (2.62%). LFHPAs were identified in 27 of 1338 maternal samples (2.01%). HPA-9bw was by far the most common LFHPA identified in the populations studied and was the only LFHPA that was significantly more common in fathers than in mothers of affected infants (p = 0.02). CONCLUSIONS Maternal immunization against recognized LFHPAs accounts for only a small fraction of the cases of apparent NAIT not resolved by standard serologic testing. Typing of the fathers of such cases for LFHPAs is likely to be rewarding only when a maternal antibody specific for a paternal platelet glycoprotein is demonstrated and/or there is compelling clinical evidence for NAIT.
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Affiliation(s)
- Julie A Peterson
- Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, Wisconsin
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9
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Peterson JA, McFarland JG, Curtis BR, Aster RH. Neonatal alloimmune thrombocytopenia: pathogenesis, diagnosis and management. Br J Haematol 2013; 161:3-14. [PMID: 23384054 DOI: 10.1111/bjh.12235] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Neonatal alloimmune thrombocytopenia, (NAIT) is caused by maternal antibodies raised against alloantigens carried on fetal platelets. Although many cases are mild, NAIT is a significant cause of morbidity and mortality in newborns and is the most common cause of intracranial haemorrhage in full-term infants. In this report, we review the pathogenesis, clinical presentation, laboratory diagnosis and prenatal and post-natal management of NAIT and highlight areas of controversy that deserve the attention of clinical and laboratory investigators.
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Affiliation(s)
- Julie A Peterson
- Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, WI 53226-3548, US.
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10
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Detection of anti-human platelet antibodies against integrin α2β1 using cell lines. BLOOD TRANSFUSION = TRASFUSIONE DEL SANGUE 2012; 12 Suppl 1:s273-80. [PMID: 23245717 DOI: 10.2450/2012.0126-12] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 06/14/2012] [Accepted: 09/12/2012] [Indexed: 11/21/2022]
Abstract
BACKGROUND Antibodies against human platelet antigens (HPA) are a cause of thrombocytopenia. Detection of rare anti-HPA antibodies using platelet preparations is difficult and would be improved by an alternative method that does not require platelets. In the present study, we describe the establishment of cell lines that stably express specific HPA associated with integrin α2β1 and the application of these cell lines for detecting anti-HPA-5a and anti-HPA-5b antibodies. MATERIALS AND METHODS Complementary DNA of the integrin α2 variants HPA-5b, -13b and -18b were individually transfected into K562 cells using retroviral vectors. Expression of integrin α2 was confirmed by flow cytometric analysis, immunoprecipitation and western blotting analysis. To verify whether the cell line panel was suitable for clinical diagnosis, we analysed its properties using monoclonal antibody-specific immobilisation of platelet antigens (MAIPA) and well-characterised serum samples. RESULTS Exogenous integrin α2 expression was observed in the transfected cells for over 6 months. The cell line panel specifically detected previously characterised anti-HPA-5a and anti-HPA-5b antisera. No reactivity was observed with control sera, including normal sera and HLA antisera. DISCUSSION We successfully established a cell line panel to facilitate the sensitive and reliable detection of anti-HPA-5a and anti-HPA-5b antibodies.
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Peterson JA, Pechauer SM, Gitter ML, Kanack A, Curtis BR, Reese J, Kamath VM, McFarland JG, Aster RH. New platelet glycoprotein polymorphisms causing maternal immunization and neonatal alloimmune thrombocytopenia. Transfusion 2011; 52:1117-24. [PMID: 22070736 DOI: 10.1111/j.1537-2995.2011.03428.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
BACKGROUND Maternal immunization against low-frequency, platelet (PLT)-specific antigens is being recognized with increasing frequency as a cause of neonatal alloimmune thrombocytopenia (NAIT). STUDY DESIGN AND METHODS Serologic and molecular studies were performed on PLTs and DNA from two families in which an infant was born with severe thrombocytopenia not attributable to maternal immunization against known PLT-specific alloantigens. RESULTS Antibodies reactive only with paternal PLTs were identified in each mother using flow cytometry and solid-phase assays. Unique mutations encoding amino acid substitutions K164T in glycoprotein (GP)IIb (Case 1) and R622W in GPIIIa (Case 2) were identified in paternal DNA and in DNA from the affected infants. Each maternal antibody recognized recombinant GPIIb/IIIa mutated to contain the polymorphisms identified in the corresponding father. None of 100 unselected normal subjects possessed these paternal mutations. CONCLUSIONS Severe NAIT observed in the affected infants was caused by maternal immunization against previously unrecognized, low-frequency antigens created by amino acid substitutions in GPIIb/IIIa (α(IIb) /β(3) integrin). A search should be conducted for novel paternal antigens in cases of apparent NAIT not explained on the basis of maternal-fetal incompatibility for known human PLT antigens.
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Affiliation(s)
- Julie A Peterson
- Blood Research Institute and Platelet & Neutrophil Immunology Laboratory, BloodCenter of Wisconsin, 8727 Watertown Plank Road, Milwaukee,WI 53226-3548, USA.
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12
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The development of severe neonatal alloimmune thrombocytopenia due to anti-HPA-1a antibodies is correlated to maternal ABO genotypes. Clin Dev Immunol 2011; 2012:156867. [PMID: 22110529 PMCID: PMC3216343 DOI: 10.1155/2012/156867] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2011] [Revised: 08/16/2011] [Accepted: 09/16/2011] [Indexed: 11/17/2022]
Abstract
Background. Maternal alloantibodies against HPA-1a can cross placenta, opsonize foetal platelets, and induce neonatal alloimmune thrombocytopenia (NAIT). In a study of 100, 448 pregnant women in Norway during 1995–2004, 10.6% of HPA-1a negative women had detectable anti-HPA-1a antibodies. Design and Methods. A possible correlation between the maternal ABO blood group phenotype, or underlying genotype, and severe thrombocytopenia in the newborn was investigated. Results. We observed that immunized women with blood group O had a lower risk of having a child with severe NAIT than women with group A; 20% with blood group O gave birth to children with severe NAIT, compared to 47% among the blood group A mothers (relative risk 0.43; 95% CI 0.25–0.75). Conclusion. The risk of severe neonatal alloimmune thrombocytopenia due to anti-HPA-1a antibodies is correlated to maternal ABO types, and this study indicates that the observation is due to genetic properties on the maternal side.
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Sant'Anna Gomes BM, Estalote AC, Palatnik M, Pimenta G, Pereira BDB, Do Nascimento EM. Prevalence, serologic and genetic studies of high expressers of the blood group A antigen on platelets*. Transfus Med 2011; 20:303-14. [PMID: 20553427 PMCID: PMC2988417 DOI: 10.1111/j.1365-3148.2010.01017.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVE/AIM The aim of this study is to describe the distribution of the platelet blood group A antigenicity in Euro-Brazilians (EUBs) and Afro-Brazilians (AFBs). BACKGROUND A small but significant proportion of individuals express high levels of A or B antigen on their platelets corresponding to the erythrocyte ABO group. The mechanism of increased antigen expression has not been elucidated. MATERIAL/METHODS A cohort of 241 blood group A donors was analysed by flow cytometry. Although mean fluorescence intensity (MFI) is a typical continuous variable, platelets were screened and divided into two categories: low expressers (LEs) and high expressers (HEs). A three-generation family was investigated looking for an inheritance mechanism. RESULTS The prevalence of the HE platelet phenotype among group A(1) donors was 2%. The mean of MFI on platelets of A(1) subgroup of EUBs differs from that of AFBs (P = 0·0115), whereas the frequency of the HE phenotype was similar between them (P = 0·5251). A significant difference was found between sexes (P = 0·0039). Whereas the serum glycosyltransferase from HE family members converted significantly more H antigen on group O erythrocytes into A antigens compared with that in LE serum, their ABO, FUT1 and FUT2 genes were consensus. The theoretically favourable, transcriptionally four-repeat ABO enhancer was not observed. CONCLUSION The occurrence of HE in several members suggests familial aggregation. Indeed, in repeated measures, stability of the MFI values is suggesting an inherited condition. Factors outside the ABO locus might be responsible for the HE phenotype. Whether the real mechanism of inheritance is either of a polygenic or of a discrete Mendelian nature remains to be elucidated.
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Affiliation(s)
- B M Sant'Anna Gomes
- Blood Transfusion Service Research Laboratory, Hospital Universitário Clementino Fraga Filho (HUCFF), Brazil
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14
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Establishment of a cell line panel for the detection of antibodies against human platelet antigen 4b. Int J Hematol 2011; 93:170-175. [PMID: 21286877 DOI: 10.1007/s12185-011-0772-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2010] [Revised: 01/06/2011] [Accepted: 01/12/2011] [Indexed: 10/18/2022]
Abstract
Antibodies against human platelet antigens (HPAs) play important roles in thrombocytopenia. In Japan, HPA-4b antibody is frequently responsible for HPA-related neonatal alloimmune thrombocytopenia. A highly sensitive assay using platelets has been developed for the detection of antibodies against HPAs. However, it is difficult to obtain the platelets expressing specific HPAs required for the assay. Therefore, an alternative method not requiring platelets would be helpful to detect antibodies against HPAs. Glycoprotein IIIa (GPIIIa) cDNA encoding HPA-4b was individually co-transduced with that of wild-type GPIIb in K562 cells, which is a non-adherent cell line, using a retroviral vector. The expression of transgene products in cultured cells were observed for over 6 months. Next, to evaluating the sensitivity and specificity of this cell line panel, we performed monoclonal antibody-specific immobilization of platelet antigens (MAIPA) assay with a serum previously identified by another method. All HPA-4b antibodies in serum samples were positive, and all serum samples, including normal serum and serum containing HLA antibodies were negative. No difference was observed in the specificity and sensitivity between our method and conventional MAIPA using platelets. The present results indicate that this established cell line panel permits highly sensitive detection of specific antibodies against HPA-4b.
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Peterson JA, Gitter ML, Kanack A, Curtis B, McFarland J, Bougie D, Aster R. New low-frequency platelet glycoprotein polymorphisms associated with neonatal alloimmune thrombocytopenia. Transfusion 2009; 50:324-33. [PMID: 19821948 DOI: 10.1111/j.1537-2995.2009.02438.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND Recent reports suggest that maternal immunization against low-frequency, platelet (PLT)-specific glycoprotein (GP) polymorphisms is a more common cause of neonatal alloimmune thrombocytopenia (NATP) than previously thought. STUDY DESIGN AND METHODS Serologic and molecular studies were performed on PLTs and DNA from three families in which an infant was born with apparent NATP not attributable to maternal immunization against known PLT-specific alloantigens. RESULTS Antibodies reactive only with paternal PLTs were identified in each mother. In Cases 2 (Kno) and 3 (Nos), but not Case 1 (Sta), antibody recognized paternal GPIIb/IIIa in solid-phase assays. Unique mutations encoding amino acid substitutions in GPIIb (Case 2) or GPIIIa (Cases 1 and 3) were identified in paternal DNA and in DNA from two of the affected infants. Antibody from all three cases recognized recombinant GPIIIa (Case 1 [Sta] and Case 3 [Nos]) and GPIIb (Case 2, Kno) mutated to contain the polymorphisms identified in the respective fathers. None of 100 unselected normal subjects possessed the paternal mutations. Enzyme-linked immunosorbent assay and flow cytometric studies suggested that failure of maternal serum from Case 1 (Sta) to react with paternal GPIIIa in solid-phase assays resulted from use of a monoclonal antibody AP2, for antigen immobilization that competed with the maternal antibody for binding to the Sta epitope. CONCLUSION NATP in the three cases was caused by maternal immunization against previously unreported, low-frequency GP polymorphisms. Maternal immunization against low-frequency PLT-specific alloantigens should be considered in cases of apparent NATP not resolved by conventional serologic and molecular testing.
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Affiliation(s)
- Julie A Peterson
- Blood Research Institute and Platelet & Neutrophil Immunology Laboratory, BloodCenter of Wisconsin, Milwaukee, Wisconsin 53201-2178, USA.
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