Biomaterial Database

Clinical relevance of antikeratin antibodies in rheumatoid arthritis and symmetric polyarthritis associated with hepatitis C infection. 2004

M Cojocaru, and Inimioara Mihaela Cojocaru, and Simona Alexandra Iacob

"Colentina" Clinical Hospital, Bucharest, Romania. mcojocar@cmb.ro

Chronic hepatitis C virus (HCV) has been linked to extrahepatic autoimmune phenomena. In addition a variety of autoantibodies were found in patients with HCV. This study was performed to assesss the clinical relevance of antikeratin antibodies in rheumatoid arthritis (RA) and in patients with symmetric polyarthritis associated with hepatitis C infection. Serum antikeratin antibodies were evaluated in 3 different groups of patients; all were rheumatoid factor (RF) seropositive: Group 1: 31 patients with HCV associated symmetric polyarthralgia or arthritis. Group 2: 28 patients with RA (modified ACR criteria for probable RA). Group 3: 16 patients with autoimmune disorders other than RA. Seventeen healthy individuals matched for age and sex served as controls. In our study, 75 patients who were rheumatoid factor positive (measured by ELISA, the cutoff was established to 20 U/mL) were tested for antikeratin antibodies using an indirect immunofluorescence technique with 1:10 serum dilution. Antikeratin antibodies were detected in 18/28 (64%) patients with true RA and only 3/31 (9%) patients with HCV-related arthritis (p < 0.0001). Antikeratin antibodies were observed in 3/16 (18%) patients of group 3 (p < 0.05). Antikeratin antibodies were not found in the sera of the healthy controls.

UI	MeSH Term	Description	Entries
D007074	Immunoglobulin G	The major immunoglobulin isotype class in normal human serum. There are several isotype subclasses of IgG, for example, IgG1, IgG2A, and IgG2B.	Gamma Globulin, 7S,IgG,IgG Antibody,Allerglobuline,IgG(T),IgG1,IgG2,IgG2A,IgG2B,IgG3,IgG4,Immunoglobulin GT,Polyglobin,7S Gamma Globulin,Antibody, IgG,GT, Immunoglobulin
D007633	Keratins	A class of fibrous proteins or scleroproteins that represents the principal constituent of EPIDERMIS; HAIR; NAILS; horny tissues, and the organic matrix of tooth ENAMEL. Two major conformational groups have been characterized, alpha-keratin, whose peptide backbone forms a coiled-coil alpha helical structure consisting of TYPE I KERATIN and a TYPE II KERATIN, and beta-keratin, whose backbone forms a zigzag or pleated sheet structure. alpha-Keratins have been classified into at least 20 subtypes. In addition multiple isoforms of subtypes have been found which may be due to GENE DUPLICATION.	Cytokeratin,Keratin Associated Protein,Keratin,Keratin-Associated Proteins,alpha-Keratin,Associated Protein, Keratin,Keratin Associated Proteins,Protein, Keratin Associated,alpha Keratin
D008297	Male		Males
D005260	Female		Females
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D001168	Arthritis	Acute or chronic inflammation of JOINTS.	Oligoarthritis,Polyarthritis,Arthritides,Oligoarthritides,Polyarthritides
D001172	Arthritis, Rheumatoid	A chronic systemic disease, primarily of the joints, marked by inflammatory changes in the synovial membranes and articular structures, widespread fibrinoid degeneration of the collagen fibers in mesenchymal tissues, and by atrophy and rarefaction of bony structures. Etiology is unknown, but autoimmune mechanisms have been implicated.	Rheumatoid Arthritis
D001323	Autoantibodies	Antibodies that react with self-antigens (AUTOANTIGENS) of the organism that produced them.	Autoantibody
D012217	Rheumatoid Factor	Autoantibodies found in adult RHEUMATOID ARTHRITIS patients that are directed against GAMMA-CHAIN IMMUNOGLOBULINS.	Factor, Rheumatoid
D015415	Biomarkers	Measurable and quantifiable biological parameters (e.g., specific enzyme concentration, specific hormone concentration, specific gene phenotype distribution in a population, presence of biological substances) which serve as indices for health- and physiology-related assessments, such as disease risk, psychiatric disorders, ENVIRONMENTAL EXPOSURE and its effects, disease diagnosis; METABOLIC PROCESSES; SUBSTANCE ABUSE; PREGNANCY; cell line development; EPIDEMIOLOGIC STUDIES; etc.	Biochemical Markers,Biological Markers,Biomarker,Clinical Markers,Immunologic Markers,Laboratory Markers,Markers, Biochemical,Markers, Biological,Markers, Clinical,Markers, Immunologic,Markers, Laboratory,Markers, Serum,Markers, Surrogate,Markers, Viral,Serum Markers,Surrogate Markers,Viral Markers,Biochemical Marker,Biologic Marker,Biologic Markers,Clinical Marker,Immune Marker,Immune Markers,Immunologic Marker,Laboratory Marker,Marker, Biochemical,Marker, Biological,Marker, Clinical,Marker, Immunologic,Marker, Laboratory,Marker, Serum,Marker, Surrogate,Serum Marker,Surrogate End Point,Surrogate End Points,Surrogate Endpoint,Surrogate Endpoints,Surrogate Marker,Viral Marker,Biological Marker,End Point, Surrogate,End Points, Surrogate,Endpoint, Surrogate,Endpoints, Surrogate,Marker, Biologic,Marker, Immune,Marker, Viral,Markers, Biologic,Markers, Immune