title: Massive cutaneous hyalinosis. Identification of the hyalin material as monoclonal kappa light chains, adhesive 90 kD glycoprotein, and type I collagen.
abstract: The hyalin material in massive cutaneous hyalinosis, a disease characterized by extensive tumorous periodic acid-Schiff-(PAS) positive extracellular cutaneous deposits, has been elucidated by biochemical and immunologic methods. Three major components were found: kappa light chains, a mannose-rich glycoprotein, and type I collagen. Trace amounts of fibrinogen, fibronectin, laminin, IgG, pregnancy-specific glycoprotein, albumin, and keratan sulfate, but not keratin, were also present. The kappa light chains were monoclonal, cryoprecipiting, and more basic than the kappa chains from two myeloma patients. The glycoprotein, which could not be identified as any known glycoprotein, had an apparent molecular weight of 90,000 D. Amino acid analysis showed that glutamic acid, aspartic acid, leucine, and threonine were abundant, whereas hydroxyproline, hydroxylysine, and sulfhydryl amino acids were absent. The carbohydrate content of the protein was approximately 20%. The major monosaccharides were mannose and N-acetylglucosamine. Galactose, N-acetylneuraminic acid and fucose also were present. The third major component of the hyalin material was identified as type I collagen. A humoral immune response to the storage material was found: the patient's serum contained IgM and IgG class antibodies against the mannosylglycoprotein (90 kD glycoprotein) and against type I collagen.
mesh_terms: D000368:Aged; D000951:Antigens, Neoplasm; D014408:Biomarkers, Tumor; D002352:Carrier Proteins; D003094:Collagen / Q000032:analysis*; D004586:Electrophoresis; D005260:Female; D006023:Glycoproteins / Q000032:analysis*; D006801:Humans; D006818:Hyalin / Q000032:analysis* / Q000276:immunology; D007147:Immunoglobulin Light Chains / Q000032:analysis*; D007145:Immunoglobulin kappa-Chains / Q000032:analysis*; D007158:Immunologic Techniques; D008970:Molecular Weight; D011507:Proteinuria / Q000276:immunology; D012871:Skin Diseases / Q000276:immunology*; D016326:Extracellular Matrix Proteins
chemical_list: D000951:Antigens, Neoplasm; D014408:Biomarkers, Tumor; D002352:Carrier Proteins; D003094:Collagen; D006023:Glycoproteins; D007147:Immunoglobulin Light Chains; D007145:Immunoglobulin kappa-Chains; C081856:LGALS3BP protein, human; D016326:Extracellular Matrix Proteins