Biomaterial Database

Lambert-Eaton syndrome: antigen-antibody interaction and calcium current inhibition in chromaffin cells. 1992

M P Viglione, and C E Creutz, and Y I Kim

Department of Biomedical Engineering, University of Virginia School of Medicine, Carlottesville.

Plasma and IgG obtained from 10 Lambert-Eaton myasthenic syndrome (LES) patients (5 with carcinoma, 5 without associated cancer), 6 healthy subjects, and 1 patient with small-cell lung cancer (SCLC) were examined in their ability to recognize chromaffin cell antigens on Western blots. The pattern of antigen recognition was compared with the magnitude of inhibition of voltage-dependent calcium and sodium currents recorded with the patch-clamp technique from chromaffin cells. Eight of the 11 patients with LES and/or SCLC recognized plasma membrane proteins and 9 of the patients' IgG interacted with cytoplasmic antigens with no apparent pattern of antigen recognition between patients. Also, there was no obvious band pattern distinguishing patients with LES from those with LES and concurrent SCLC. Eighty percent of the LES patients' antibodies were capable of reducing the calcium current (ICa) in chromaffin cells. One of the novel findings of this study is that 30% of the patients had produced antibodies which were able to inhibit both calcium and sodium currents (INa). The heterogeneous response of the IgG on the Western blots does not appear to correlate with the efficacy of reducing the inward currents.

UI	MeSH Term	Description	Entries
D002118	Calcium	A basic element found in nearly all tissues. It is a member of the alkaline earth family of metals with the atomic symbol Ca, atomic number 20, and atomic weight 40. Calcium is the most abundant mineral in the body and combines with phosphorus to form calcium phosphate in the bones and teeth. It is essential for the normal functioning of nerves and muscles and plays a role in blood coagulation (as factor IV) and in many enzymatic processes.	Coagulation Factor IV,Factor IV,Blood Coagulation Factor IV,Calcium-40,Calcium 40,Factor IV, Coagulation
D002838	Chromaffin System	The cells of the body which stain with chromium salts. They occur along the sympathetic nerves, in the adrenal gland, and in various other organs.	Argentaffin System,Argentaffin Systems,Chromaffin Systems,System, Argentaffin,System, Chromaffin,Systems, Argentaffin,Systems, Chromaffin
D004553	Electric Conductivity	The ability of a substrate to allow the passage of ELECTRONS.	Electrical Conductivity,Conductivity, Electric,Conductivity, Electrical
D004594	Electrophysiology	The study of the generation and behavior of electrical charges in living organisms particularly the nervous system and the effects of electricity on living organisms.
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000937	Antigen-Antibody Reactions	The processes triggered by interactions of ANTIBODIES with their ANTIGENS.	Antigen Antibody Reactions,Antigen-Antibody Reaction,Reaction, Antigen-Antibody,Reactions, Antigen-Antibody
D012964	Sodium	A member of the alkali group of metals. It has the atomic symbol Na, atomic number 11, and atomic weight 23.	Sodium Ion Level,Sodium-23,Ion Level, Sodium,Level, Sodium Ion,Sodium 23
D015153	Blotting, Western	Identification of proteins or peptides that have been electrophoretically separated by blot transferring from the electrophoresis gel to strips of nitrocellulose paper, followed by labeling with antibody probes.	Immunoblotting, Western,Western Blotting,Western Immunoblotting,Blot, Western,Immunoblot, Western,Western Blot,Western Immunoblot,Blots, Western,Blottings, Western,Immunoblots, Western,Immunoblottings, Western,Western Blots,Western Blottings,Western Immunoblots,Western Immunoblottings
D015624	Lambert-Eaton Myasthenic Syndrome	An autoimmune disease characterized by weakness and fatigability of proximal muscles, particularly of the pelvic girdle, lower extremities, trunk, and shoulder girdle. There is relative sparing of extraocular and bulbar muscles. CARCINOMA, SMALL CELL of the lung is a frequently associated condition, although other malignancies and autoimmune diseases may be associated. Muscular weakness results from impaired impulse transmission at the NEUROMUSCULAR JUNCTION. Presynaptic calcium channel dysfunction leads to a reduced amount of acetylcholine being released in response to stimulation of the nerve. (From Adams et al., Principles of Neurology, 6th ed, pp 1471)	Eaton-Lambert Syndrome,Myasthenic Syndrome, Lambert-Eaton,Eaton-Lambert Myasthenic Syndrome,Lambert-Eaton Syndrome,Myasthenic-Myopathic Syndrome of Eaton-Lambert,Myasthenic-Myopathic Syndrome of Lambert-Eaton,Myopathic-Myasthenic Syndrome of Eaton-Lambert,Myopathic-Myasthenic Syndrome of Lambert-Eaton,Eaton Lambert Myasthenic Syndrome,Eaton Lambert Syndrome,Eaton-Lambert Myasthenic-Myopathic Syndrome,Eaton-Lambert Myopathic-Myasthenic Syndrome,Eaton-Lambert Myopathic-Myasthenic Syndromes,Lambert Eaton Myasthenic Syndrome,Lambert Eaton Syndrome,Lambert-Eaton Myasthenic-Myopathic Syndrome,Lambert-Eaton Myasthenic-Myopathic Syndromes,Lambert-Eaton Myopathic-Myasthenic Syndrome,Lambert-Eaton Myopathic-Myasthenic Syndromes,Myasthenic Myopathic Syndrome of Eaton Lambert,Myasthenic Myopathic Syndrome of Lambert Eaton,Myasthenic Syndrome, Eaton-Lambert,Myasthenic Syndrome, Lambert Eaton,Myopathic Myasthenic Syndrome of Eaton Lambert,Syndrome, Eaton-Lambert,Syndrome, Eaton-Lambert Myasthenic,Syndrome, Lambert-Eaton,Syndrome, Lambert-Eaton Myasthenic