Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:Q16637 (SMA)
 8,107 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Serum rubella, measles and cytomegalovirus antibodies were measured in patients with various forms of chronic liver disease and compared with those in age-matched controls. In CAH all three antibodies were found in significantly greater titre than in controls,and in cryptogenic cirrhosis titres to rubella were significantly increased. In alcoholic cirrhosis none was increased. There was no correlation between antibody titres and either the presence of portal-systemic shunts or the use of steroids. In patients with CAH measles titres were significantly related to the presence of ANF and SMA.
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PMID:Viral antibodies and chronic liver disease. 18 61

Three hundred and twelve sera containing antibodies to smooth muscle (SMA) wer analysed for the immunofluorescence patterns they produced in various tissues. A classification is described based on the three main appearances in rat kidney. Some sera, mainly of low titre, reacted only with vessel walls (SMA-V), some stained vessels and renal glomeruli (SMA-G) and high titre sera, mainly from patients with chronic active hepatitis stained vessels, glomeruli, and intracellular fibrils in renal tubules (SMA-T). Peripheral staining in hepatocytes or thyroid cells was not a regular feature. 41/43 polyclonal SMA-T and -G sera were absorbed out completely by actin, and this also removed the pericullular staining in liver and thyroid when present. High titre SMA-V antibodies could not be absorbed by actin, and the antigen remains to be identified.
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PMID:Classification of smooth muscle autoantibodies detected by immunofluorescence. 77 46

Thirty sera reacting by IFL technique in titres greater than or equal to 100 with smooth muscle fibres of rat stomach, rat renal glomeruli, and with the membrane region of thyroid cells were randomly chosen among sera sent in for routine testing of tissue antibodies. All sera but one were found to be derived from patients with chronic active hepatitis. The smooth muscle and other relevant cell staining were abolished after absorption of sera with actin, prepared from rabbit skeletal muscle and found to be homogeneous by SDS gel-electrophoresis and by electron microscopy. The actin anti-bodies were purified by precipitation of sera with F-actin and elution of the precipitates at acid pH. The purified antibodies stained all tissues in the same way as the original sera. In double immunodiffusion tests all thirty sera gave precipitation with actin. Thus, it was concluded that these broad-reacting SMA are directed against actin. The finding of high-titred SMA is of diagnostic value and supports the clinical diagnosis of active chronic hepatitis. In addition, anti-actin antibodies eluted from human sera are a suitable tool for studying actin-containing cellular structures.
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PMID:Anti-actin specificity of human smooth muscle antibodies in chronic active hepatitis. 94 40

The concept of auto-immune hepatitis as a disease entity evolved from the descriptions of 'chronic active hepatitis' (CAH) in the 1950s. Several types of CAH are distinguished by disease-specific features. The distinctive (but not exclusive) markers for auto-immune CAH include: a negative test for HBsAg; female; Northern European ethnic background; multisystem disease expression; histological CAH with large areas of periportal piecemeal necrosis and plasmacytosis; pronounced hypergammaglobulinaemia; serum auto-antibodies the HLA B8-DR3 phenotype; responsiveness to corticosteroid therapy; and rarity of supervening hepatocellular carcinoma. Much weight is attached to the serological marker auto-antibodies to nuclear or smooth muscle (actin) antigens (ANA, SMA). However, these auto-antibodies do not have an absolute association with auto-immune CAH: the serological reactions are not yet standardized; titres decrease with remission of disease; and other auto-antibodies mark variant forms of auto-immune hepatitis. A more confident acceptance of auto-immune hepatitis as an entity requires detection of a liver-specific antigen, a valid experimental disease model in animals, and a better understanding of immune-mediated damage to liver cells.
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PMID:Auto-immune (lupoid) hepatitis: an entity in the spectrum of chronic active liver disease. 210 17

Of 1270 consecutive patients with liver diseases of various types we have examined the blood serum on autoimmune antibodies against cell nuclei (ANA), smooth muscle (SMA) and vascular endothelium. 98 patients (7.7%) had antibodies of one of the above. These patients were matched with patients with the same liver diagnosis without antibodies following the matched pair technique. 3-5 years later both were examined by the family doctor. It remained a collection of 58 pairs. The examined criteria were compared pair by pair. We conclude the existence of autoimmune antibodies from type ANA, SMA or vascular endothelium is without prognostic prediction. The outcome of chronic active hepatitis was in majority benign, but the outcome of alcohol-toxic hepatitis was bad, because the people were unable to stop the alcoholism.
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PMID:[Detection of tissue antibodies and long-term prognosis in liver diseases--a catamnestic matched-pair study]. 325 62

In South Italy chronic hepatitis is characterized by high frequency of HBsAg positivity, male prevalence and infrequent presence of clinical signs of autoimmunity. To clarify some etiologic aspects of HBsAg negative chronic hepatitis, immunofluorescent tests for ANA, AMA, SMA and for liver membrane antibody (LMA) were performed on the sera of 116 consecutive non alcoholic patients with histological pattern of chronic active hepatitis (42 HBsAg+, 35 antiHBV+ and 39 negatives for all HBV markers). ANA, AMA and SMA positivity did not differentiate the three groups of patients. LMA was detectable in the sera of a relatively few number of cases; no difference was found between HBsAg positive and negative patients (21% and 18% respectively). On the contrary strong association (p less than 0.0005) was found between LMA positivity and activity of the disease, as evaluated on the basis of transaminases and IgG serum levels. These results indicate that autoimmune chronic hepatitis is rare in our geographical area and they suggest that LMA positivity is not a specific test of autoimmune liver diseases.
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PMID:[Serological indices of autoimmunity in an Italian case-load of chronic active HBsAg positive and negative hepatitis]. 638 27

A solid-phase radioimmunoassay was developed to detect antibodies to liver membrane antigens in sera of patients with HBsAg-negative and -positive liver diseases and primary non-hepatic autoimmune diseases. Ten of fourteen patients with HBsAg-negative CAH had autoantibodies detected by RIA; negative results were obtained with sera of seven patients with HBsAg-positive acute and chronic liver diseases, six patients with miscellaneous liver diseases, including two patients with PBC, two healthy blood donors and seven patients with primary non-hepatic autoimmune diseases. Antibodies detected by RIA correlated with liver membrane autoantibodies (LMA) found by indirect immunofluorescence; no correlation was observed with AMA, ANA and SMA. Species-cross-reacting antibodies could be absorbed by preincubation with isolated plasma cell membranes prepared from rabbit livers. Liver membrane autoantibodies detected by RIA were directed against three different antigen fractions obtained from Sepharose 6B chromatography including LSP and LM-Ag. Only three of ten antibodies were directed against species-specific determinants; others cross-reacted with rabbit antigens. Only the antibody to LSP was organ-specific, all others cross-reacted with kidney proteins. Ferritin, human serum albumin and human plasma lipoprotein were excluded as target antigens. Although several sera reacted with identical molecules a remarkable heterogeneity of liver membrane autoantibodies was observed.
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PMID:Detection and characterization of liver membrane autoantibodies in chronic active hepatitis by a solid-phase radioimmunoassay. 678

Twenty patients found LKM antibody positive during the routine screening for autoantibodies, were studied for the association with other autoantibodies. Sixteen sera (80%) were found positive either for ANA (50%) or SMA (50%) or both (20%). Eleven patients (55%) were over 40 years old, 3 patients were HBsAg+ve, 4 have toxic and alcohol-related liver disease. These results provide evidence that the LKM antibody is not confined to young people chronic active hepatitis, but is present also in CALD of adult with various etiology. Its association with other autoantibodies (especially ANA) suggest that also LKM could be a marker of autoimmunity. The presence of ANA may be an expression of more severe stages of the disease.
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PMID:[The microsomal antibody (LKM) in liver pathology: its association with other autoantibodies]. 697 May 82

To clarify the importance of ethnic and geographic factors in chronic active hepatitis (CAH), HBV markers and autoantibodies (AMA, ANA, SMA), have been compared in 158 patients with biopsy-proven CAH from New York City and in 92 patients with CAH from Milan. HBsAg-positive CAH was more frequently observed in Milan (49%) than in New York City (27%). However, among HBsAg-positive patients, HBcAg, HBeAg, and epidemiologic risk factors for acquisition of HBV infection were more frequently found in New York than in Italy. The prevalence of HBsAg-negative, anti-HBc-positive CAH and cryptogenic CAH was similar in the two cities, while autoimmune CAH was more frequently observed in New York (20%) than in Milan (2%). In particular, the prevalence of autoimmune hepatitis was higher among Jewish patients than among patients of Anglo-Saxon or Latin ethnic background in New York. Thus, environmental and/or ethnic factors may influence the prevalence of the four major types of CAH.
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PMID:Geographic differences in HBV related, autoimmune, and cryptogenic chronic active hepatitis. 717 41

We prospectively measured serum alkaline phosphatase (ALP), aspartate and alanine transaminase (AST/ALT), and tested sera for antinuclear, smooth-muscle, and antimitochondrial antibodies (ANA, SMA, AMA) in our patients with celiac sprue to determine the prevalence of associated liver abnormalities and its relevance to clinical management. Of 129 patients, ALP was the only elevated enzyme in 12 (9%) and in most cases was not thought to reflect significant liver disease. Seventeen (13%) had elevated AST and/or ALT with normal ALP. Levels normalized in 15 patients after dietary gluten exclusion and remained elevated in 2 noncompliers. Two patients (2%) with elevated AST, ALT, and ALP underwent further investigation: one had negative autoantibodies, liver biopsy, and endoscopic retrograde cholangiography and the other had ANA-positive chronic active hepatitis; enzymes in both cases improved with a gluten-free diet. There was no significant association between elevated AST/ALT and positive ANA/SMA; no patient had AMA. Abnormalities in liver enzymes are common in celiac sprue, but usually respond to dietary gluten exclusion. We propose that there is no need for invasive liver investigation in these patients unless there is more specific evidence of primary liver disease or failure of dietary response.
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PMID:Liver abnormalities associated with celiac sprue. How common are they, what is their significance, and what do we do about them? 766 16


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