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 immunoglobulins and C3 levels, auto-antibodies to smooth muscle (SMA), mitochondria (MA), and nuclei (ANA), rheumatoid factors (RF), HB-antigen and HB-antibody were studied in 9 groups of liver disease. Hypergammaglobulinaemia was a prominent feature in most groups, IgG being particularly raised in active chronic hepatitis, IgM in primary biliary cirrhosis, and IgA in alcoholic liver disease, respectively. IgE was often increased in alcoholic liver disease and was frequently low in hepatic tumours, whereas IgD showed no typical pattern in any liver disorder. SMA was most frequently found in active chronic hepatitis (68%), and MA in primary biliary cirrhosis (58%), while ANA was detected in 50% of the patients with active chronic hepatitis. However, a pronounced over-lap of tissue antibodies was observed among the various groups of liver disease, particularly in active chronic hepatitis and primary biliary cirrhosis. The concurrent presence of SMA and ANA was most frequent in active chronic hepatitis. It was not excluded that antibody titres might have provided better diagnostic discrimination, since titration of antibodies was not performed. Low C3 levels in active chronic hepatitis were correlated with low levels of other liver-synthetized proteins, and no evidence was found of increased consumption by immunologic reactions.
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PMID:Serum immunoglobulins and organ non-specific antibodies in diseases of the liver. 86 91

Various immunological indices, hitherto considered in isolation, were evaluated in a single group of 20 cases of ulcerous colitis. Immunofluorescence showed anticolon Ab in 3 cases (15%), whereas this features was absent in a control group. Antistomach, antithyroid and non-organ-specific Ab's (ANA, AMA, SMA) were equally incident in both groups. One caso is examined separately on account of its simultaneous presentation of human and rat antistomach and antithyroid and antismooth muscle Ab's. Reuma test, Waaler Roose reaction, L.E. phenomenon and test, and direct and indirect Coombs test results were negative in nearly all cases. Slight quantitative changes in serum proteins revealed by electrophoresis and immunodiffusion were indicative of inflammation with an immunitary tendency. The data are not sufficient to support the attribution of an autoimmunitary aetiology to ulcerous colitis, though simultaneous evaluation of reaction indices serves to strengthen this view.
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PMID:[Aspects of humoral immunity in ulcerous colitis]. 109 61

Antinuclear antibodies with the homogeneous pattern (ANA-H) and smooth muscle antibodies with antiactin specificity (SMA-AA) are regarded as the serum markers of type-1 autoimmune chronic hepatitis. Their diagnostic relevance, however, has been questioned recently after the detection of signs of hepatitis C virus infection in autoimmune chronic hepatitis patients. To further evaluate this point, antihepatitis C virus antibodies were sought by two second generation assays (ELISA 2 and RIBA 2) in 100 Italian patients with chronic liver disease of unknown aetiology, including 46 with (autoimmune chronic hepatitis) and 54 without the above antibodies (cryptogenic). By ELISA 2, antihepatitis C virus, although significantly prevalent in cryptogenic (83%), were found also in a substantial proportion of autoimmune chronic hepatitis patients (46%) (p < 0.0001), their occurrence was confirmed by RIBA 2 in almost all cases (96% and 86%, respectively). Autoimmune patients with either ANA-H or SMA-AA exhibited similar antihepatitis C virus prevalences (59% and 52%, respectively); by contrast, the eight cases positive for both the autoantibodies were consistently antihepatitis C virus negative. These findings confirm that in countries with high hepatitis C virus circulation (like Italy) an overlap between autoimmune chronic hepatitis and hepatitis C virus infection, reflected by 'true' antihepatitis C virus antibodies, does occur. The detection of ANA-H or SMA-AA, in fact, identifies chronic liver disease patients with a relatively low prevalence of antihepatitis C virus, but does not exclude hepatitis C virus infection. Positive findings for both ANA-H and SMA-AA, however, is an appropriate marker for hepatitis C virus free 'primary' autoimmune chronic hepatitis.
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PMID:Serum autoantibodies and the diagnosis of type-1 autoimmune hepatitis in Italy: a reappraisal at the light of hepatitis C virus infection. 133 Aug 45

Spectrum, dynamics, and immunoglobulin class of the non-organ specific autoantibodies were investigated in 646 sequential sera from 18 woodchucks with experimental woodchuck hepatitis virus (WHV) infection and in 8 naturally infected chronic carriers of the virus. Among examined WHV carriers, 8 animals developed hepatocellular carcinoma. The sera were tested by indirect immunofluorescence for autoantibodies against smooth muscle (SMA), nuclei (ANA), brush border of proximal renal tubuli (ABBA), and mitochondria (AMA). Analysis revealed that inoculation with WHV was followed by the appearance and/or meaningful elevation of the titre of SMA in IgG class. In all 18 experimentally infected woodchucks, the autoantibody rise preceded the appearance of viral serologic markers (WHsAg and/or WHeAg) by 1 to 4 weeks (mean +/- SD = 2.5 +/- 1.5 weeks). Once induced, SMA remained steadily detectable achieving the peak titre value around week 12 postinoculation. The SMA dynamics did not parallel with the fluctuation of the virus serologic markers and they were similar both in animals who recovered from acute episodes and in those who progressed to chronic infection. In chronic carriers, contrasted to acute infection, fluctuation of SMA titre even to undetectable levels and frequent parallel rises and falls of SMA, ANA, and ABBA titres were observed. A different pattern was found in all three chronic carriers who acquired infection from mothers. In this group, high and relatively stable autoantibody levels were detected. Development of hepatocellular carcinoma was not associated with any specific autoantibody pattern. This study revealed that WHV invasion undoubtedly induces non-organ specific autoimmune response.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:Autoantibody pattern in a woodchuck model of hepatitis B. 207 10

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

In 29 patients (twelve female, 17 male) the following immunologic parameters were examined before and between days 1 to 3, 6 to 8, 13 to 15 and 20 to 22 after open-heart surgery: T-lymphocytes; immunoglobulins IgG, IgM, IgA, IgE; complement factors C3, C4 and the autoantibodies (Anti-DNA, myocardial antibodies, SMA, ANA, AMA) to assess changes in these parameters and their relationship to postoperative complications, in particular post-cardiotomy-syndrome (PCS). PCS was found in five patients (17.2%), in three fully developed, in two in a partial form. In the very early (first to third day) postoperative course, significant suppression of most parameters was found, most likely due to tissue traumatization intraoperatively as well as to the extracorporeal circulation. There was suppression of T-lymphocytes, immunoglobulins IgG, IgM and IgA and the complement factors C3 and C4. The IgE rose slightly. The serum IgM level appears to be of prognostic relevance since the patients with IgM suppression had a higher incidence of postoperative complications (PCS, pancreatitis). In the later postoperative course IgM, C3 and C4 significantly exceeded the preoperative values. The rise in IgM can be explained as an immunologic answer to a subclinical infection or to an immunization by autoantigenic tissue. The rise in C3 and C4 was interpreted as an acute phase reaction. These changes, however, had no influence on the postoperative course of the autoantibodies, only subsarcolemmal myocardial antibodies were found preoperatively; in four of the five patients with PCS, these myocardial antibodies were present prior to surgery. Postoperative myocardial antibodies were found in 75% of the patients. In all probability they are only indicative of nonspecific myocardial lesions.
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PMID:[Changes in immunologic parameters following heart operations with special reference to the postcardiotomy syndrome]. 348 59

The aim of the investigation was to estimate chosen parameters of fat balance and immunological reactivity in patients with virushepatitis and alcohol abuse (30 patients--I group), and without alcohol abuse in anamnesis (30 patients--II group). The investigations included the estimation of the presence of HBsAg in serum, the level of immunoglobulins IgG, IgA and IgM, the determination of T and B lymphocytes, the presence of organ-autoantibodies (SMA, ANA, AMA), the level of free fatty acids, triglycerides, full lipids, beta-lipoproteins and cholesterol in the blood serum. The rise in full lipids content in the blood serum, beta-lipoproteins, triglycerides, the increase of IgA level, the decrease of lymphocytes T percentage, more frequent confirmation of the presence of antimitochondrial autoantibodies were noted, especially in the group of patients with virushepatitis and alcohol abuse. Disturbances in fat balance remain in the convalescence period.
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PMID:[Lipid values and immune parameters in the course of viral hepatitis in patients with alcohol abuse and without alcohol stress in anamnesis]. 633 26

The prevalence of liver cell membrane antibodies (LMA) was evaluated in the sera of 124 untreated patients with various chronic liver diseases, in 17 acute hepatitis patients and in 40 normal controls by indirect immunofluorescence on rabbit hepatocytes, isolated by non-enzymatic method. The presence of LMA was compared with the presence of HBs Ag, anti-HBc and non-organ specific autoantibodies (anti-nuclear antibody, ANA; smooth muscle antibody, SMA; anti-mitochondrial antibody, AMA; liver-kidney microsomal antibody, LKM). LMA was found in 83% of autoimmune chronic active liver disease (CALD), in 47% of cryptogenic CALD and in 42% of primary biliary cirrhosis (PBC). LMA prevalence both in HBsAg positive and HBsAg negative/anti-HBc positive CALD was 11%, significantly lower than in the other three groups. In the cryptogenic group the prevalence of non-organ specific autoantibodies was significantly lower than LMA prevalence. The 35 LMA positive sera were titred to end point dilution. Autoimmune cases presented titres higher than those of all the other groups. Adsorption experiments showed that in autoimmune cases LMA fluorescence is not blocked by pre-incubation with liver antigens LSP and LP2, while a mild blocking effect was observed in some HBsAg positive cases or PBC sera. No cross-reaction with mitochondrial antigens was observed in PBC sera. LMA can still be considered a marker of autoimmune CALD only when present at high titre and without cross-reactivity with other liver antigens.
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PMID:Occurrence and significance of IgG liver membrane autoantibodies (LMA) in chronic liver diseases of different aetiology. 634 85

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


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