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At least 613 records · Page 34Linked to original sources
PubMed1990

Characterization of glycosyl phosphatidylinositol lipids of parasitic protozoans: Leishmania mexicana mexicana promastigotes, Trypanosoma cruzi Peru epimastigotes and Tritrichomonas foetus.

Glycosyl phosphatidylinositol lipids of cultured L.mex, mexicana LV732 promastigotes, T. cruzi Peru epimastigotes and Tritrichomonas foetus have been isolated and characterized using metabolic labelling and chromatographic and mass spectrometric (MS) techniques. TLC of the unsaponifiable lipid fractions of L. mex. mexicana and T. cruzi obtained from DEAE Sephadex A-25 followed by Iatrobead column chromatography showed three inositol phosphate-containing lipid components. [3H]myo-inositol, [3H]palmitic acid or H3 32PO4 lipid precursors were incorporated into these three lipid components. Fraction 2 (LM2 and TCP-2) comprises inositol phosphate ceramides. The other two fractions appear to contain mono-O-alkyl and di-O-alkyl glycerol inositol phosphates. Lyso-1-O-alkyl phosphatidylinositols could be cleaved by treatment of PI-specific phosphalipase C. The di-O-alkyl-phospho inositols of these parasites being the first dialkylglycerol lipids reported from eukaryotic membranes raises the possibility of chemotherapy for leishmaniasis and trypanosomiasis based upon functional impairment of alkyl ether lipids. Tritrichomonas foetus contains two major glycophosphosphingolipids, designated TF1 and TF2, which are metabolically labelled with [3H]myo-inositol and H3 32PO4. Both lipids contained ceramides. The major ceramide contains the 18:0 and 18:1 bases and 16:0 N-acyl group. The major glycolipid fraction (TF1) contains fucose linked to inositol diphosphate; one of the phosphates being linked to the ceramide moiety, and the other to ethanolamine. TF1 appears to be a novel class of glycophosphosphingolipid, which may be a part of a membrane anchor.

Animals↗
PubMed1980

Mummies from Peru. Demonstration of antigenic determinants of collagen in the skin.

This paper describes immunofluorescence studies on the possible preservation of antigenic determinants of different types of collagen in sections of the skin of human mummies from Peru. The age of the mummies was dated from the 4th to the 14th century AD. Using specific antibodies, it was possible to demonstrate type I and type III collagen. The antigenic determinants specific for procollagen type I, procollagen type III and the type IV collagen component of basement membranes were not preserved.

Adolescent↗
PubMed1978

[Contact urticaria caused by Peru balsam].

By tests on six patients with recurrent urticaria it could be demonstrated that it was caused by an allergy against Peru balsam. Different reaction types seem to have been responsible for the occurrence of the urticaria. Cross reactions with different other substances, mainly luxury food and stimulants, play a particular part.

Adult↗
PubMed1993

High prevalence of Epstein-Barr virus in the Reed-Sternberg cells of Hodgkin's disease occurring in Peru.

The Epstein-Barr virus (EBV) has been implicated in the pathogenesis of Hodgkin's disease (HD). This study was undertaken to determine whether the association of EBV with HD showed geographical variation, as in Burkitt's lymphoma. We studied 32 formalin-fixed, paraffin-embedded cases of HD occurring in Peru. EBV DNA-RNA in situ hybridization was performed using a 30-base biotinylated antisense oligonucleotide complementary to the EBER1 gene of EBV. EBV immunohistochemistry was also performed, using a monoclonal antibody (MoAb) to the latent membrane protein (LMP1) of EBV. Identification of the precise cellular subset staining with EBV was accomplished via double-labeling with MoAbs directed against Reed-Sternberg cells (LeuM1/CD15) and B cells (L26/CD20). EBV RNA was identified in all or virtually all of the Reed-Sternberg cells and variants in 30 of the 32 (94%) cases of HD by in situ hybridization. LMP1 expression was identified in 83% of the EBER1-positive cases. Double-labeling studies confirmed the localization of EBV RNA to CD15-expressing Hodgkin's cells. This study found an extremely high prevalence of EBV in Peruvian HD, in contrast to the much lower percentage of EBV-associated cases of HD occurring in "Western" patients.

Adolescent↗
PubMed1993

Nasal lymphomas in Peru. High incidence of T-cell immunophenotype and Epstein-Barr virus infection.

The incidence of non-Hodgkin's lymphoma of the nasal region is much higher in Peru than in the United States and is similar to the incidence of sinonasal lymphomas in Asian countries. To characterize these lymphomas, we evaluated the clinical, morphologic, and immunohistochemical features of 14 cases and also analyzed the cases for Epstein-Barr virus (EBV) RNA using a sensitive and specific in situ hybridization method. Morphologically, the cases consisted of nine large cell immunoblastic lymphomas, one diffuse mixed cell lymphoma, one diffuse small cleaved lymphoma, one small noncleaved lymphoma, and two cases unclassifiable in the Working Formulation. Eleven cases demonstrated evidence of T lineage, two were of B lineage and one of indeterminate immunophenotype. In 13 of the lymphoma cases including all of the T-cell lymphomas, EBV RNA was detected in a high percentage of cells. Double-labeling immunohistochemical and in situ hybridization studies identified CD43 positivity in the cells labeling for EBV RNA. Much smaller amounts of EBV RNA were detectable in six of eight control benign nasopharyngeal biopsy specimens, and two were completely negative. These findings are similar to the prevalence of EBV-positive T-cell lymphomas in Asian countries and differ from the findings of the more common EBV-negative B-cell nasal lymphomas in the United States. These findings suggest that EBV plays a role in the development of nasal T-cell lymphomas and that the incidence of EBV infection may explain the reported "East-West" difference in the incidence of nasal T-cell lymphomas.

Adolescent↗
PubMed2005

Neurocysticercosis: association between seizures, serology, and brain CT in rural Peru.

BACKGROUND: Neurocysticercosis (NCC) is the commonest helminthic CNS infection and the main cause of adult-onset seizures in developing countries, also frequent in industrialized countries because of immigration from endemic zones. Although NCC is commonly seen in individuals with seizures in endemic areas, its role as a cause of epilepsy has been questioned on the basis of the poor methodology of published studies. OBJECTIVE: To determine, in a cysticercosis-endemic area of the northern Peruvian coast, the frequency of 1) epileptic seizures, 2) serum antibodies to Taenia solium, 3) NCC-compatible findings on brain CT, and 4) the associations between these variables. METHODS: A community-wide screening survey for possible seizure cases was performed using a validated questionnaire. Positive respondents were later examined in the field by neurologists. Seizure cases were categorized as single seizure, active epilepsy, or inactive epilepsy. Serology was performed for all consenting individuals using immunoblot. Noncontrast brain CT scans were performed in all individuals with seizures and two groups of control subjects without seizures (seropositive and seronegative). RESULTS: The screening survey was applied to 903 permanent residents. Most positive respondents (114/137 [83.2%]) were examined by neurologists. The overall prevalence of epilepsy was 32.1 per 1,000 and that of active epilepsy was 16.6 per 1,000. Seroprevalence was 24.2% (200/825). Seroprevalence was associated with seizures (odds ratio 2.14; p = 0.026). Brain CT abnormalities compatible with NCC were more frequent in individuals with seizures and in those seropositive. CONCLUSION: In this hyperendemic area, an important proportion of seizure cases are associated with neurocysticercosis as demonstrated by serology or brain CT.

Adolescent↗