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Biomedical subjects

O Prou

Publications and source records attributed to O Prou.

At least 19 recordsLinked to original sources
PubMed1992

Human T lymphotropic virus (HTLV) type I and II DNA amplification in HTLV-I/II-seropositive blood donors of the French West Indies.

To confirm the presence of DNA from human T lymphotropic virus type I (HTLV-I), HTLV-II, or both in individuals found HTLV-I/II-positive through systematic screening of blood donations in Guadeloupe (French West Indies), 42 blood donors repeatedly positive for HTLV-I/II by ELISA were studied by polymerase chain reaction (PCR). Three primer pairs (env, pol, tax) targeted on conserved regions of HTLV-I or -II sequences (or both) and six probes (two generic, two HTLV-I-specific, two HTLV-II-specific) were used in a multiplex PCR. HTLV-I sequences were detected in 31 individuals (74%). All 31 subjects positive by Western blot (WB) harbored HTLV-I sequences. Fifteen individuals (48%) were positive with the three primer pairs used, 10 (32%) with two, and 6 (20%) with one. Subjects indeterminate or negative by WB were all negative by PCR. No HTLV-II sequences were detected with specific probes. The results indicate the absence of HTLV-I and -II infection in individuals with indeterminate WB, the presence of HTLV-I DNA in individuals positive for WB in the French West Indies, and the absence of HTLV-II infection in the cohort.

Adult↗
PubMed1990

Enzyme immunoassays for detection of malarial antigens in human plasmas by Plasmodium falciparum monoclonal antibodies.

The screening of blood donors for the detection of dangerous disease carriers is a mandatory requirement for blood transfusion centers. Enzyme immunoassay (EIA) is a suitable method for the examination of large populations. We describe a sandwich EIA allowing the detection of soluble malarial antigens in plasma using 11 mouse monoclonal antibodies. Among the 121 combinations tested, 2 were selected for their sensitivity and specificity. Both were applied to plasmas of (a) acute patients, (b) people living in malarious areas, (c) blood donors at risk (travelers), and (d) sedentary blood donors without risk. With 1 of the 2 combinations, the percentage of positive answers was 68.4% (n = 38) for a, 62.6% (n = 206) for b, 4.5% (n = 398) for c, and 0.8% (n = 485) for d; with the other combination, the percentage of positive answers was 68.4% for a, 46.1% for b, 1.5% for c, and 0% for d. Using 2 combinations simultaneously, the positive results were 94.7% for a, 70.4% for b, 5% for c, and 0.8% for d. The 2 assays are complementary and the pair can be used for maximum Plasmodium falciparum antigen recognition in prospective donors.

Animals↗
PubMed1989

[Human B lymphotropic virus (HBLV) or human herpesvirus (HHV-6)].

HHV.6 (or HBLV) herpesvirus was isolated in 1986. This virus has a specific tropism for T cells. It is ubiquitous. Most subjects are infected in early childhood. HHV.6 is responsible for exanthema subitum. Its possible involvement in the aggravation of immunodeficiency syndromes and its action on malignant haematologic disorders, has been suggested but has not been clearly demonstrated.

B-Lymphocytes↗
PubMed1987

[Value of rapid diagnosis of Plasmodium falciparum using indirect monoclonal immunofluorescence].

Development and use of murine specific monoclonal antibodies associated with an indirect immunofluorescent assay allows a rapid detection of P. falciparum antigens. This work compares the results obtained by interpretation of Giemsa staining technique on blood smears, to the use of a commercial reagent (Monofluo Kit P. falciparum). This monoclonal indirect immunofluorescent assay (I.F.I.M.) provides the clinician with a precious aid to diagnosis as well by its specificity and sensitivity, better than conventional staining techniques; particularly in pauciparasitaemia induced by prime-infestation or partial anti-malarial drug resistance.

Animals↗
PubMed1985

[Detection of Plasmodium falciparum by indirect immunofluorescence using specific murine monoclonal antibodies].

The monoclonal immunofluorescence technique described here is a sensitive method to detect very small P. falciparum antigens. It is specially usefull in very low parasitemias when the detection of infected R.B.C. is particularly difficult by conventional Giemsa's coloured smears on thick drops. This technique requires only 0.5 to 1 ml of blood to be performed. This method allows the microscopic examination of large number of blood samples in a relatively short time. It permits also a very precise localisation of parasite in R.B.C. In the same way, the chemotherapy can easily be followed up and chemo-resistance forms may be studied more precisely than when using the standard microscopic examination. Reactions are always negative in individuals who have never visited malaria endemic countries. The plasma polyclonal antibodies directed against P. falciparum do not interfere with the technique (carried out on fresh or thawed R.B.C.).

Animals↗
PubMed1985

Nonorgan-specific autoantibodies and immunoglobulin allotypes in relatives of patients with monoclonal gammopathy.

Polyclonal immunoglobulin increase, rheumatoid factor, antinuclear antibodies and cold lymphocytotoxins were detected 10, 8, 7 and 8 times, respectively, in a group of these informative families (22, 17 and 29 subjects tested, respectively). Each family included at least 1 subject with a monoclonal gammopathy in addition to that of the proband. No correlation could be shown between any of these abnormalities and Gm haplotypes. Nonetheless, it is worth noting that 6 out of 41 relatives under 30 years of age had cold lymphocytotoxins.

Adolescent↗
PubMed1983

Susceptibility to invasion by Plasmodium falciparum of some human erythrocytes carrying rare blood group antigens.

Tn and Cad erythrocytes which carry unusual carbohydrate moieties attached to glycophorin A and B, the main red cell membrane sialoglycoproteins, resist invasion by the malarial parasite Plasmodium falciparum. Tn red cells are defective in sialic acid and galactose whereas Cad erythrocytes are characterized by a normal sialic acid content but the presence of an additional N-acetylgalactosamine residue attached to each sialotetrasaccharide chain O-glycosidically linked to glycophorin A and B. Homozygous MgMg red cells, which are defective in the cluster of three sialotetrasaccharide chains located at positions 2, 3 and 4 of glycophorin A, are normally invaded. Erythrocytes typed McM carry a glycophorin A molecule intermediate between those from M and N (amino acid substitution at position 1 or 5) but are, like control MN red cells, susceptible to invasion. These results suggest that the primary requirement for entry of P. falciparum merozoites into human red cells is the recognition of a carbohydrate structure present on glycophorin A or B which includes sialic acid and galactose, but is not necessarily clustered at the N-terminal end of the molecule.

Blood Group Antigens↗
PubMed1982

[Anti-plasmodium falciparum monoclonal antibodies. Preliminary results].

P. falciparum grown in culture was used to immunize mice and to obtain hybridomas. Two hybrids were selected secreting high titers of monoclonal antibodies directed against the cytoplasm of erythrocytic forms of the Plasmodium and not against the membrane of normal or parasitized erythrocytes. Such antibodies are of potential value in the immuno-diagnosis of malaria.

Animals↗
PubMed1980

Freeze dried platelets for HLA alloantibodies absorption.

Antibodies to HLA-A and B are specifically absorbed onto platelets. A method of absorption of these antibodies using freeze dried platelets is described. This method allows long-term storage and standardized absorption procedures. Anti-DR antibodies and cold lymphocytotoxins are recovered in the supernatant.

Absorption↗
PubMed1980

Cold lymphocytotoxins in autoimmune haemolytic anemia.

288 sera with red cell auto-antibodies and 141 control sera were investigated for cold lymphocytotoxins (CLCT). An incidence of 72% and 40% respectively was found in patients with cold haemagglutinin disease and in those with warm IgG type AHA. The absence of increased frequency in idiopathic or methyl-dopa induced asymptomatic red cell auto-immunization would suggest that CLCT might reflect an advanced degree of auto-immune disorder. No difference was observed in reaction patterns of isolated B and T lymphocytes or of those from individuals with I negative red cell phenotype.

Adult↗