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Query: UMLS:C0024530 (malaria)
 44,886 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

1. Apparently a living, metabolizing parasite is required to induce the formation of autoantibodies. 2. It seems unlikely that immune complexes of the first type, i.e., positive for plasmodial antigens, are responsible for the induction of autoantibodies, as the transferred malarious plasma (group B) also contained that type of immune complex, but did not induce the formation of the second type of complex. 3. Although a deregulation of the immunocompetent system will occur in animals with a high parasitemia (immunosuppression), the fact that extremely low parasitemia is sufficient to induce antismoothmuscle antibodies suggests that proliferation of "forbidden clones" of self-reactive lymphocytes is not very likely. 4. Antismooth-muscle antibodies are frequently associated with active chronic hepatitis in man. Whether any damage to liver tissue (6) during malaria infection may be responsible for the induction of antismoothmuscle antibodies remains to be investigated. The clinical relevance of these findings is as yet obscure, and one should be careful in comparing these results of the rodent model with the human situation. 5. It remains to be elucidated whether the high level of so-called nonspecific antibodies in acutely infected mice can be explained entirely by the existence of antibodies to parasitic antigens and to host smooth-muscle antigens.
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PMID:Clomerulopathy in mice infected with Plasmodium berghei: induction of an autoimmune process. 35 98

Among the Melanesian population of Papua New Guinea, cancer of the oral cavity associated with betel nut chewing is the most commonly reported. Liver cancer is also common and is closely associated with chronic hepatitis-B infection. Burkitt's lymphoma occurs along coastal areas with a high rainfall and intense malaria transmission. The descriptive epidemiology of other cancers in Papua New Guinea is also discussed.
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PMID:Cancer in Papua New Guinea. 53 33

Eight hundred Jordanians with liver enlargement were studied: 369 (46%) were males and 431 (54%) females. Ages ranged between 13 and 85 years, with a mean of 47.4%: 766 cases demonstrated a single pathological process while 34 cases showed two or more processes. The most significant findings were: congestion secondary to cardiac failure in 323 cases (38.5%); inflammatory and parasitic processes in 192 cases (22.9%), including acute hepatitis (81 cases), hydatid cyst (63 cases), chronic hepatitis (27 cases), liver abscess (19 cases), brucellosis (one case) and malaria (one case); malignancy in 164 cases (19.6%); liver cirrhosis in 80 cases (9.5%); fatty metamorphosis in 47 cases (5.6%); metabolic and genetic disease in 11 cases (1.3%); miscellaneous conditions in nine cases (1.1%); and 15 apparently normal individuals (1.8%). Cardiac failure was the most frequent cause of hepatomegaly in this sample of Jordanians. Inflammatory processes were the second major cause, followed by malignancy and cirrhosis of the liver.
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PMID:Patterns of hepatomegaly in Jordanians: a prospective study of 800 cases. 407 96

Inside of 95 patients presented in Hospital with presumed hepatitis: 77 were recruted with liver cytolysis (Amino-Transferases AT > 80 UI/ml) and included in this study. Study of serologic viral markers (A, B, C, D and E type) permited to prove viral acute hepatitis infection and 49 patients were recruted inside the 77 cytolytic cases. Inside these 49 cases: 44% presented enteritic contamination with HAV/HEV markers, 36% with HBV markers: HBs/HBc, 6% with HBs/HBe markers, 10% with HDV marker, 4% with HCV marker. 28 patients presented any viral acute hepatitis marker and in this case can be evocated other hepatitis origin: viral hepatitis type (EBV), CMV, chronic hepatitis evolution, malaria hepatitis or toxic hepatitis.
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PMID:[Viral markers of acute hepatitis: A, B, C, D, and E in Dakar. October 92 - October 93]. 775 79

A severe flare-up of chronic hepatitis B infection with liver cell insufficiency has been observed in two patients after discontinuation of chloroquine administered either as malaria prophylaxis or as treatment of presumed rheumatoid arthritis. Chloroquine is known to inhibit the association of the major histocompatibility complex type II with hepatitis B virus antigens, thereby inhibiting T-cell mediated lysis of infected cells. Furthermore, it inhibits uptake of duck hepatitis B virus by duck liver cells. These in vitro studies and our clinical observations suggest that chloroquine inhibits the lysis of hepatitis B virus infected hepatocytes. Withdrawal of chloroquine in patients with chronic hepatitis B virus infection can lead to a rebound immune response manifesting as a reactivation of hepatitis B, similar to that observed after steroid withdrawal.
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PMID:[Reactivation of hepatitis B following withdrawal of chloroquine]. 820 73

Serologic markers of HCV and HEV were investigated in 74 French soldiers with non-A, non-B hepatitis and in 18 patients involved in an outbreak of non-A,non-B hepatitis in Algeria. Moreover, anti-HCV antibodies were detected in 13 patients with non-A,non-B hepatitis of parenteral origin. HEV antibodies were investigated in 61-65% of patients involved in the 2 enterically transmitted outbreaks of non-A,non-B hepatitis observed in Algeria and Chad. The third cluster of non-A,non-B hepatitis observed in French soldiers serving in French Guyana is more likely to be attributed to malaria prophylactic treatment with Amodiaquine than to a viral origin. HCV infection was observed in 93% of acute or chronic cases associated with blood transfusion or parenteral drug abuse. Among acute cases, none of the soldiers who contracted the disease in Africa or in French Guyana was found to be anti-HCV positive compared to 78% of those who contracted the disease in France. HCV infections resulted in chronic hepatitis in 61% of cases.
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PMID:Hepatitis E and hepatitis C virus infections among French soldiers with non-A, non-B hepatitis. 838 72

Major histocompatibility complex (MHC) molecules bind peptides bearing an appropriate 'sequence motif' for MHC binding. The use of phage display libraries exploits the ability of MHC class II molecules to exchange peptides in solution and thus select out peptide sequences with high-affinity binding from a large array of random peptides. We have analysed the peptide binding motifs of HLA-DRB1*1301 and *1302 using affinity purified HLA-DR13 molecules to purify sequentially HLA-DR13-binding peptides from a large random library of M13 phage containing nonamer inserts in the pIII coat protein. These DR13 alleles differ only at position 86 of the HLA-DR beta chain, where they contain valine and glycine residues respectively. These alleles were chosen because of their association with protection from severe malaria and chronic hepatitis B virus infection in West Africa. Analysis of the phage bound to these DR molecules suggests binding motifs. We compare the results derived from the use of the phage display library with results obtained from analysis of eluted peptides and peptide-binding studies. This analysis shows that although there is a common theme to motifs derived using different methods, there are also subtle variations between them.
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PMID:Analysis of peptide-binding motifs for two disease associated HLA-DR13 alleles using an M13 phage display library. 888 46

The most frequent hepatobiliary diseases in Vietnam are chronic hepatitis and cirrhosis, liver abscess, hepatobiliary ascaridiasis, angiocholitis, biliary lithiasis and primary liver cancer. The principal causes of chronic hepatitis and cirrhosis are HBV and HCV infections. Alcohol and chemicals (drugs, agricultural, industrial, war herbicides) also play an important role. Malaria causes hepatitis and fibrosis lesions, however no cirrhotic lesions were observed. There are two categories of liver abscess, amoebic and cholangitic, often caused by ascaridiasis. Treatment of amoebic abscesses is, at first, non-surgical for small abscesses, often combined with ultrasound guided abscess puncture. Cholangitis abscesses are more serious and often require surgical intervention. Among the gallstones, only 15% are of the gall-bladder, the majority are choledocho- and intrahepatic-lithiasis, composed largely of calcium bilirubinate and are frequently caused by Ascaris-related cholangitis and the nucleation of Ascaris eggs. Forty-seven per cent of acute cholecystitis are acalculous, showing a higher frequency than in Western countries. Primary liver cancer is one of the most frequent malignancies in Vietnam. More than 90% of liver cancers are hepatocellular carcinomas. The principal causes are HBV infection, followed by HCV infection, aflatoxin, alcohol and chemicals. Recent efforts aiming at earlier diagnosis, by selective screening in high-risk groups, have used clinical surveillance, abdominal sonography and AFP level determination. Promising results were obtained in prevention trials by reducing the high AFP level of cirrhotic patients using a vegetal drug, Gacavit, and by treatment with percutaneous ethanol injection therapy, as an alternative therapeutic measure for liver tumour resection.
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PMID:Some peculiarities of hepatobiliary diseases in Vietnam. 919 96

Several observations suggest that bacteria induce autoimmunity in primary biliary cirrhosis (PBC). Since no PBC-specific bacterial species could be identified, it can be speculated that the triggers are non-species-specific bacterial proteins. This hypothesis would imply that several or even all bacterial species can trigger PBC. Therefore, we investigated whether PBC exhibits immune reactions to non-species-specific bacterial antigens. Yersinia enterocolitica O3 was screened for the presence of proteins that were labeled by immunoblotting using PBC sera. We focused our investigations on a 160-kDa protein, which was further enriched and characterized by partial N-terminal amino acid sequencing. The prevalence of antibodies to this protein was determined by immunoblotting in a variety of diseases. The 160-kDa protein was identified as the beta-subunit of bacterial RNA-polymerase, a highly conserved bacterial protein with a very high degree of sequence identity among all bacterial species. Antibodies to the beta-subunit of bacterial RNA polymerase were specific for this protein. Until now no mammalian protein could be found that cross-reacts with these antibodies. The prevalence of antibodies to the beta-subunit of bacterial RNA polymerase (ARPA) using the protein from Yersinia enterocolitica O3 (serum dilution 1:1000) was: healthy controls (HC, N = 101) 7.9%, primary biliary cirrhosis (PBC, N = 61) 32.8%, autoimmune hepatitis type 1 (AIH, N = 46) 26.1%, alcoholic liver cirrhosis (ALC, N = 44) 9.1%, Crohn's disease (CD, N = 38) 7.9%, ulcerative colitis (UC, N = 24) 8.3%, primary sclerosing cholangitis + UC (PSC/UC, N = 11) 0%, acute yersiniosis (Yers, N = 36) 19.4%, acute infection with Campylobacter jejuni (Camp, N = 10) 0%, acute Q-fever (QF, N = 16) 6.25%, chronic hepatitis C (HCV, N = 39) 7.7%, c-ANCA-positive vasculitis (Vasc, N = 40) 15%, systemic lupus erythematosus (SLE, N = 28) 10.7%, and malaria tropica (MT, N = 24) 16.7%. There was no significant difference between PBC and AIH. The group of autoimmune liver diseases (PBC + AIH, N = 107, 29.9%) differed highly significantly from HC, chronic inflammatory bowel diseases (CD + UC + PSC/UC, N = 73, 6.8%), ALC, and HCV and also differed significantly (P = 0.01) from the group with bacterial and parasitic diseases (Yers + Camp + QF + MT, N = 86,13.95%) and from the group with Vasc + SLE (N = 68,13.2%). Testing of ARPA using the protein from E. coli yielded nearly identical results. In conclusion, an increased prevalence of antibodies to the beta-subunit of bacterial RNA polymerase, a highly conserved non-species-specific bacterial protein, can be found in primary biliary cirrhosis, but also in autoimmune hepatitis type I. These findings do not add an argument for a bacterial trigger of PBC. Rather, they suggest that ARPA belong to the pool of natural antibodies that are up-regulated in autoimmune liver diseases.
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PMID:Identification of beta-subunit of bacterial RNA-polymerase--a non-species-specific bacterial protein--as target of antibodies in primary biliary cirrhosis. 1275 71

Host genetic factors play a major role in determining differential susceptibility to major infectious diseases of humans, such as malaria, HIV/AIDS, tuberculosis, and invasive pneumococcal disease. Progress in identifying the relevant genetic loci has come from a variety of approaches. Most convincing associations have been identified by case-control studies assessing biologically plausible candidate genes. All six of the genes that have a major effect on infectious disease susceptibility in humans have been identified in this way. However, recently genome-wide linkage analysis of affected sibling pairs has identified susceptibility loci for chronic infections such as leprosy and chronic hepatitis B virus persistence. Other approaches used successfully have included assessment in humans of the homologues of susceptibility genes mapped and identified in murine models. However, the great majority of susceptibility loci remain to be identified and the advent of large-scale genome-wide association scans offers a new approach to defining many of these.
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PMID:Aspects of genetic susceptibility to human infectious diseases. 1709 41


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