Clinicoserological insights into patients with immune checkpoint inhibitor-induced myasthenia gravis. 2023

Gianvito Masi, and Minh C Pham, and Tabitha Karatz, and Sangwook Oh, and Aimee S Payne, and Richard J Nowak, and James F Howard, and Jeffrey T Guptill, and Vern C Juel, and Kevin C O'Connor
Department of Immunobiology, Yale School of Medicine, New Haven, Connecticut, 06511, USA.

To compare the immunopathology of immune checkpoint inhibitor-induced myasthenia gravis (ICI-MG) and idiopathic MG, we profiled the respective AChR autoantibody pathogenic properties. Of three ICI-MG patients with AChR autoantibodies, only one showed complement activation and modulation/blocking potency, resembling idiopathic MG. In contrast, AChR autoantibody-mediated effector functions were not detected in the other two patients, questioning the role of their AChR autoantibodies as key mediators of pathology. The contrasting properties of AChR autoantibodies in these cases challenge the accuracy of serological testing in establishing definite ICI-MG diagnoses and underscore the importance of a thorough clinical assessment when evaluating ICI-related adverse events.

UI MeSH Term Description Entries
D009157 Myasthenia Gravis A disorder of neuromuscular transmission characterized by fatigable weakness of cranial and skeletal muscles with elevated titers of ACETYLCHOLINE RECEPTORS or muscle-specific receptor tyrosine kinase (MuSK) autoantibodies. Clinical manifestations may include ocular muscle weakness (fluctuating, asymmetric, external ophthalmoplegia; diplopia; ptosis; and weakness of eye closure) and extraocular fatigable weakness of facial, bulbar, respiratory, and proximal limb muscles. The disease may remain limited to the ocular muscles (ocular myasthenia). THYMOMA is commonly associated with this condition. Anti-MuSK Myasthenia Gravis,MuSK MG,MuSK Myasthenia Gravis,Muscle-Specific Receptor Tyrosine Kinase Myasthenia Gravis,Muscle-Specific Tyrosine Kinase Antibody Positive Myasthenia Gravis,Myasthenia Gravis, Generalized,Myasthenia Gravis, Ocular,Anti MuSK Myasthenia Gravis,Generalized Myasthenia Gravis,Muscle Specific Receptor Tyrosine Kinase Myasthenia Gravis,Muscle Specific Tyrosine Kinase Antibody Positive Myasthenia Gravis,Myasthenia Gravis, Anti-MuSK,Myasthenia Gravis, MuSK,Ocular Myasthenia Gravis
D011950 Receptors, Cholinergic Cell surface proteins that bind acetylcholine with high affinity and trigger intracellular changes influencing the behavior of cells. Cholinergic receptors are divided into two major classes, muscarinic and nicotinic, based originally on their affinity for nicotine and muscarine. Each group is further subdivided based on pharmacology, location, mode of action, and/or molecular biology. ACh Receptor,Acetylcholine Receptor,Acetylcholine Receptors,Cholinergic Receptor,Cholinergic Receptors,Cholinoceptive Sites,Cholinoceptor,Cholinoceptors,Receptors, Acetylcholine,ACh Receptors,Receptors, ACh,Receptor, ACh,Receptor, Acetylcholine,Receptor, Cholinergic,Sites, Cholinoceptive
D003167 Complement Activation The sequential activation of serum COMPLEMENT PROTEINS to create the COMPLEMENT MEMBRANE ATTACK COMPLEX. Factors initiating complement activation include ANTIGEN-ANTIBODY COMPLEXES, microbial ANTIGENS, or cell surface POLYSACCHARIDES. Activation, Complement,Activations, Complement,Complement Activations
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000082082 Immune Checkpoint Inhibitors Drugs that block negative regulator IMMUNE CHECKPOINT proteins (e.g., PD-1 RECEPTOR and CTLA-4 ANTIGEN) thereby increasing suppressed immune activation in immunotherapies. CTLA-4 Inhibitor,CTLA-4 Inhibitors,Cytotoxic T-Lymphocyte-Associated Protein 4 Inhibitor,Cytotoxic T-Lymphocyte-Associated Protein 4 Inhibitors,Immune Checkpoint Blockade,Immune Checkpoint Blockers,Immune Checkpoint Inhibition,Immune Checkpoint Inhibitor,PD-1 Inhibitor,PD-1 Inhibitors,PD-1-PD-L1 Blockade,PD-L1 Inhibitor,PD-L1 Inhibitors,Programmed Cell Death Protein 1 Inhibitor,Programmed Cell Death Protein 1 Inhibitors,Programmed Death-Ligand 1 Inhibitors,Blockade, PD-1-PD-L1,CTLA 4 Inhibitor,CTLA 4 Inhibitors,Checkpoint Blockade, Immune,Checkpoint Blockers, Immune,Checkpoint Inhibition, Immune,Checkpoint Inhibitor, Immune,Checkpoint Inhibitors, Immune,Cytotoxic T Lymphocyte Associated Protein 4 Inhibitor,Cytotoxic T Lymphocyte Associated Protein 4 Inhibitors,Inhibitor, PD-1,PD 1 Inhibitor,PD 1 Inhibitors,PD 1 PD L1 Blockade,PD L1 Inhibitor,PD L1 Inhibitors,Programmed Death Ligand 1 Inhibitors
D001323 Autoantibodies Antibodies that react with self-antigens (AUTOANTIGENS) of the organism that produced them. Autoantibody

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