title: Extended analysis of AL-amyloid protein from abdominal wall subcutaneous fat biopsy: kappa IV immunoglobulin light chain.
abstract: In AL-amyloidosis the cause of amyloid fibril formation in beta-pleated sheets from the precursor protein immunoglobulin light chain is not established, but studies of AL-proteins indicate that amino acid substitutions are important in the pathogenesis. Amyloid material was extracted from a subcutaneous fat tissue biopsy and submitted to extended protein separation, typing and amino acid sequence analyses. The AL-protein belonged to the rare immunoglobulin light chain kappa, subtype kappa IV and contained unique amino acid substitutions, mostly in the highly preserved framework regions. The study shows that subcutaneous fat biopsies are useful sources of amyloid material for biochemical studies.
authors.affiliation: Division of Molecular and Immunological Pathology, Linköping University, Sweden.
authors.forename: K E
authors.initials: KE
authors.lastname: Olsen
authors.forename: K
authors.initials: K
authors.lastname: Sletten
authors.forename: P
authors.initials: P
authors.lastname: Westermark
mesh_terms: D000005:Abdomen; D000273:Adipose Tissue / Q000737:chemistry*; D000595:Amino Acid Sequence; D019943:Amino Acid Substitution; D000682:Amyloid / Q000737:chemistry*; D000686:Amyloidosis / Q000378:metabolism* / Q000473:pathology; D001706:Biopsy; D004591:Electrophoresis, Polyacrylamide Gel; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D007147:Immunoglobulin Light Chains / Q000737:chemistry*; D007145:Immunoglobulin kappa-Chains / Q000737:chemistry*; D008969:Molecular Sequence Data; D008970:Molecular Weight; D010713:Phosphatidylcholines
chemical_list: D000682:Amyloid; D007147:Immunoglobulin Light Chains; D007145:Immunoglobulin kappa-Chains; D010713:Phosphatidylcholines; C055402:1-palmitoyl-2-linoleoylphosphatidylcholine