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• W2115444092 abstract "HomeArteriosclerosis, Thrombosis, and Vascular BiologyVol. 20, No. 3Platelet Glycoprotein IIb/IIIa Receptors and Glanzmann’s Thrombasthenia Free AccessOtherPDF/EPUBAboutView PDFView EPUBSections ToolsAdd to favoritesDownload citationsTrack citationsPermissions ShareShare onFacebookTwitterLinked InMendeleyReddit Jump toFree AccessOtherPDF/EPUBPlatelet Glycoprotein IIb/IIIa Receptors and Glanzmann’s Thrombasthenia Deborah L. French and Uri Seligsohn Deborah L. FrenchDeborah L. French From the Mount Sinai School of Medicine (D.L.F.), New York, NY, and The Chaim Sheba Medical Center (U.S.), Tel-Hashomer, Israel. Search for more papers by this author and Uri SeligsohnUri Seligsohn From the Mount Sinai School of Medicine (D.L.F.), New York, NY, and The Chaim Sheba Medical Center (U.S.), Tel-Hashomer, Israel. Search for more papers by this author Originally published1 Mar 2000https://doi.org/10.1161/01.ATV.20.3.607Arteriosclerosis, Thrombosis, and Vascular Biology. 2000;20:607–610Platelet aggregation and fibrin formation are essential for the maintenance of normal hemostasis, a system designed to act quickly and effectively to arrest hemorrhage. This system is also triggered by pathogenic events, such as the rupture of an atherosclerotic plaque, which can lead to thrombotic vaso-occlusion, ischemia, and infarction. Platelets are a major contributor to these damaging and life-threatening thrombotic phenomena because of their adhesive properties, which result in the release of soluble mediators, platelet aggregation, and enhancement of thrombin generation.1 The platelet glycoprotein IIb/IIIa (GPIIb/IIIa) receptor is a key component in the pathway to platelet aggregation; consequently, this receptor has become the target for therapeutic intervention. A paradigm of this antiplatelet treatment modality is found naturally in the inherited disorder Glanzmann’s thrombasthenia. A key feature of this disease is that patients present with mucocutaneous bleeding but only rarely demonstrate spontaneous central nervous system hemorrhage,2 a feared complication of anticoagulant and antiplatelet therapy. All of the mutations that have been identified in patients with Glanzmann’s thrombasthenia result in a functional deficiency of GPIIb/IIIa receptors,23 and a hallmark of this disease is the absence of agonist-induced platelet aggregation. The molecular characterization of mutations causing Glanzmann’s thrombasthenia has provided a wealth of information on structure-function relations of the GPIIb/IIIa receptor. This review will briefly summarize those mutations that affect ligand-binding domains and receptor activation and present them in the context of predicted structures. More comprehensive coverage can be found in reviews discussing the structure and function of the GPIIb/IIIa receptor complex45 and the clinical and molecular basis of Glanzmann’s thrombasthenia.23GPIIb/IIIa ReceptorPlatelets are the first line of defense in preventing blood loss from injured blood vessels via recognition and adhesion to components of the subendothelial matrix. This event is followed by formation of a platelet plug due to recruitment of additional platelets by binding and cross-linking of large ligand molecules, such as fibrinogen and von Willebrand factor. In addition, activated platelets provide a surface for blood coagulation components, thus facilitating the generation of thrombin.67 Platelet aggregation is mediated by the GPIIb/IIIa receptor (integrin αIIbβ3), one of the most abundant cell surface receptors (≈80 000 per platelet),8 which represents ≈15% of total surface protein.9 On quiescent platelets, this receptor exhibits minimal binding affinity for von Willebrand factor and plasma fibrinogen. In an activated state, “inside-out” signal transduction mechanisms5 trigger a conformational change in the receptor to a high-affinity ligand-binding state that is competent to bind adhesive glycoproteins and form a platelet plug. After ligand binding, “outside-in” signal transduction mechanisms5 mediate integrin-cytoskeleton interactions. These have been shown to be requirements for postligand occupancy events, such as cell spreading and formation of focal adhesion sites.10Ligand recognition motifs for integrin receptors require an acidic amino acid for activity. The first example of an acidic peptide conferring integrin recognition was the Arg-Gly-Asp (RGD) sequence in fibronectin.11 Other extracellular matrix molecules were found to contain this sequence, and the concept of RGD as a common recognition motif was adopted.12 The RGD motif is found in ligands of GPIIb/IIIa receptors including the α chain of fibrinogen and von Willebrand factor, but a Lys/Gly-Asp (K/GD) recognition motif, found within a unique dodecapeptide sequence in the fibrinogen γ chain, is necessary and sufficient for fibrinogen-mediated platelet aggregation.13Because of the absence of a crystal structure, less precise information is available concerning the sites within integrin receptors that recognize ligands. Structural information is available for 1 ligand-binding region, which is the von Willebrand factor A or I (inserted) domain.14 The I domain is expressed by a subset of α-chain subunits, and high-resolution crystallography has established this domain as part of a unique metal coordination site designated the metal ion-dependent adhesion site (MIDAS).14 The I domain is not present in the GPIIb (αIIb) subunit, but structural studies have identified a region of similar cation-binding characteristics in integrin β subunits.15 A number of structural models have been generated showing the conformational association of amino acid residues predicted to play a direct role in ligand binding.161718A structural model of the ligand-binding domain of an integrin α chain has been predicted by computer modeling.19 The minimal ligand-binding sequence of GPIIb is composed of the amino-terminal 450 amino acids, which contain 7 homologous repeats with 4 cation-binding sites.20 These repeats are composed predominantly of β strands,21 which have been predicted to fold into a β-propeller structure.19 The β propeller is highly conserved in evolution, and the model for an integrin α chain contains 7 repeats of β sheets that are arranged as propeller blades around a central axis.19 Ligand binding has been proposed to take place on the face opposite the cation-binding sites that lie on the bottom of this structure.19Glanzmann’s ThrombastheniaGlanzmann’s thrombasthenia is an autosomal recessive disease that results in a functional deficiency of GPIIb/IIIa receptors.2 This lifelong disorder is characterized by mucocutaneous bleeding, with epistaxis and purpura being common in childhood and menorrhagia being common during child-bearing years and causing significant morbidity. The hallmark of this disease is severely reduced or absent platelet aggregation in response to multiple physiological agonists. This disease is caused by mutations in the genes encoding GPIIb or GPIIIa that result in qualitative or quantitative abnormalities of the platelet membrane proteins.23 The molecular characterization of Glanzmann’s thrombasthenia in patients and their families has permitted DNA-based carrier detection and prenatal diagnoses to be performed.2223 In recent years, the number of mutations that have been identified at the molecular level has increased,3 thus forming the basis of an Internet database that includes clinical, biochemical, and mutation information on reported patients (http://med.mssm.edu/glanzmanndb).Mutations Within the β-Propeller Sequence of an Integrin α ChainDifferent groups of Glanzmann’s thrombasthenia mutations that are located within the GPIIb β propeller are beginning to emerge. One group of mutations is located within and surrounding the calcium-binding domains, and another group is located within and around the third blade of the propeller (Figure 1). Four missense mutations and 1 in-frame deletion mutation in 7 patients have been identified within and surrounding the calcium-binding domains, which are located within the fourth to seventh blades of the propeller. These mutations affect transport of the GPIIb/IIIa complex to the cell surface and include a G273D(G242D) substitution (patient FLD),24 which precedes the first calcium-binding domain; E355K(E324K) (patients FL and Swiss)2526 and R358H(R327H) (patients KJ and Mila-1)2728 substitutions, located between the second and third calcium-binding domains; a G449D(G418D) (patient LM)29 substitution, which precedes the fourth calcium-binding domain; and a V425D426 (patient LeM)30 deletion at the beginning of the fourth calcium-binding domain. Another group of mutations is located within the vicinity of the third blade (W3) of the β propeller, which contains a predicted β-turn structure that has been implicated in ligand-binding of GPIIb/IIIa and other integrin receptors.3132 Four missense mutations in 5 patients result in functionally defective receptors. A T207I(T176I) (Frankfurt I)33 substitution is located in the 1-2 connecting strand, a L214P(L183P) (patient LW)34 substitution is located at the end of the second β strand near the 2-3 connecting strand, and P176A(P145A) (Mennonite)35 and P176L(P145L)35 substitutions are located within the 4-1 connecting strand between the second and third blades of the propeller. Independent support for the functional importance of this region has been shown by a D255V(D224V) mutation,36 located within the 4-1 connecting strand between the third and fourth blades of the propeller. This mutation was identified from in vitro–generated mutant GPIIb/IIIa receptors expressed on the surface of Chinese hamster ovary cells37 and disrupts ligand-binding function of the receptor.Mutations Within the MIDAS of GPIIIaEight missense mutations identified in 9 patients with Glanzmann’s thrombasthenia are located within the cation-binding sphere of the GPIIIa MIDAS domain (Figure 2). Two mutations, D145Y(D119Y) (Cam variant)38 and D145N(D119N) (patient NR),39 are located within the conserved DXSXS amino acid motif; 3 mutations, R240W(R214W) (Strasbourg I variant and patient CM),4041 R240Q(R214Q) (patient ET),42 and R242Q(R216Q) (patient SH),43 are located near the putative coordinating sites17 ; and 3 mutations, D143W(D117W) (patient MK),44 S188L(S162L) (patient BL),45 and L288P(L262P) (patient LD),46 are located within the sphere of the MIDAS domain. The mutations at residue D119 result in severe abnormalities of GPIIb/IIIa function but do not affect surface expression, whereas the mutation at D117 results in the intracellular retention of misfolded receptor complexes. The mutations at residues R214 and R216 result in surface-expressed GPIIb/IIIa receptors that are abnormally sensitive to dissociation by calcium chelation, and the mutations at residues S162 and L262 result in surface expression levels ≈30% of normal but also show sensitivity to dissociation by calcium. The importance of these sites is reinforced by the identification of a group of in vitro–generated mutant GPIIb/IIIa receptors expressed in Chinese hamster ovary cells.37 The mutations D119N, R214W, D217N, E220Q, and E220K were identified as functional defects, providing independent support for the importance of the MIDAS domain in ligand binding.Mutations That Affect Receptor ActivationTwo Glanzmann’s thrombasthenia mutations that disrupt the activation state of the GPIIb/IIIa receptor have been identified. Both mutations are located within the GPIIIa cytoplasmic domain, which is important for integrin activation and the regulation of ligand binding.47 The mutations are a R750X(R724X) nonsense mutation (patient RM),48 which results in the deletion of the carboxy-terminal 39 residues of GPIIIa, and a S778P(S752P) missense mutation (patient P or Paris I).49 Resting platelets from both patients express significant levels of stable GPIIb/IIIa complexes that are unresponsive to agonists but responsive to conformational activators. Functional analyses show normal adhesion to immobilized fibrinogen but abnormal cell spreading. The S778P(S752P) mutation shows reduced focal adhesion plaque formation, and the R750X(R724X) mutation shows undetectable tyrosine phosphorylation of focal adhesion kinase pp125FAK. These mutations provide support for the role of the GPIIIa cytoplasmic tail in the function of the GPIIb/IIIa receptor complex.ConclusionOur appreciation for the diversity of abnormalities that underlie Glanzmann’s thrombasthenia has been enriched by the molecular characterization of mutational defects identified in patients affected by this disorder. Mutations can be precisely defined, and distinct groups of mutational defects can now be identified. The molecular characterization of patients with this disorder has provided the foundation for DNA-based carrier detection and prenatal diagnoses of Glanzmann’s thrombasthenia. As the structural basis of integrin receptors begins to unfold, the identified mutations will shed light on mechanisms of receptor-ligand complex formation. The information generated from these studies will continue to provide insight into the biogenesis, structure, and function of the GPIIb/IIIa and integrin family of adhesion receptors.Download figureDownload PowerPoint Figure 1. Glanzmann’s thrombasthenia and in vitro–generated mutations located within a β-propeller structure of an integrin α-chain subunit. A schematic drawing of a 7-blade β-propeller structure predicted to represent the ligand-binding region of an integrin α-chain subunit.19 Each blade (1 to 7) is composed of antiparallel β strands (arrows numbered 1 to 4, as shown in blade 1) that are connected by hairpin loops. The 4 calcium-binding domains (blue dotted lines) are included within the 1-2 connecting loops within blades 4 to 7. These domains have been hypothesized to be located on the bottom of the propeller and lie opposite the ligand-binding sites.19 The locations of 8 missense mutations and 1 deletion mutation identified in 12 patients with Glanzmann’s thrombasthenia are represented by red circles; the in vitro–generated mutation located between the third and fourth blades of the propeller is represented by an open circle in red.Download figureDownload PowerPoint Figure 2. Glanzmann’s thrombasthenia mutations located within the vicinity of the MIDAS domain of GPIIIa (β3). A schematic drawing shows the predicted folding pattern of a von Willebrand factor A domain structure of GPIIIa in which a MIDAS domain is located at the center of the structure.17 This drawing has been modified to include mutations identified in patients with Glanzmann’s thrombasthenia. Arrows A to F represent predicted β sheets, and cylinders 1 to 7 represent predicted α-helix structures. The cation-binding D119XS121XS123 motif and coordinating residues D217 and E220 are shown in black circles. The locations of 8 mutations identified in 9 patients with Glanzmann’s thrombasthenia are represented by red circles.FootnotesCorrespondence to Deborah L. French, PhD, Box 1079 Hematology, Mount Sinai School of Medicine, One Gustave L. Levy Place, New York, NY 10029. E-mail [email protected] References 1 Coller BS. Augmentation of thrombolysis with antiplatelet drugs. Coron Artery Dis.1995; 6:911–914.MedlineGoogle Scholar2 George JN, Caen JP, Nurden AT. Glanzmann’s thrombasthenia: the spectrum of clinical disease. Blood.1990; 75:1383–1395.CrossrefMedlineGoogle Scholar3 French DL. The molecular genetics of Glanzmann’s thrombasthenia. Platelets.1998; 9:5–20.CrossrefMedlineGoogle Scholar4 Calvete JJ. On the structure and function of platelet integrin αIIbβ3, the fibrinogen receptor. 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• W2115444092 created "2016-06-24" @default.
• W2115444092 creator A5003906542 @default.
• W2115444092 creator A5021847528 @default.
• W2115444092 date "2000-03-01" @default.
• W2115444092 modified "2023-10-09" @default.
• W2115444092 title "Platelet Glycoprotein IIb/IIIa Receptors and Glanzmann’s Thrombasthenia" @default.
• W2115444092 cites W132852222 @default.
• W2115444092 cites W1489366580 @default.
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