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V Morozov

Publications and source records attributed to V Morozov.

8 recordsLinked to original sources
PubMed2005

Persistent anti-Dra in two pregnancies.

The Drori (Dr(a)) antigen is one of the ten high-prevalence antigens of the Cromer blood system, which are carried on decayaccelerating factor (DAF, CD55). The Dr(a-) phenotype was first described in a 48-year-old Jewish woman from Bukhara. Her serum contained an antibody to a high-prevalence antigen named anti-Dra. Most known individuals with the Dr(a-) phenotype are Jews from the geographic area of Bukhara, but individuals from Japan have also been described. Antibodies in the Cromer blood group system, including anti-Dra,have never been reported to cause HDN. In most of the cases with anti-Dra examined in Israel, the antibodies have been subtyped as IgG2 and IgG4. This report is of a woman with Dr(a-) phenotype and an anti-Dr(a) titer of 256 to 512 in her serum, observed during two successive pregnancies. At birth, the RBCs of the first- and second-born child were negative and positive in the DAT, respectively, and neither manifested clinical signs of HDN. The disappearance of Cromer system antibodies, including anti-Dra in midpregnancy, has been described in a previous study. In that study, it was theorized that the antibodies in the serum of the women were adsorbed onto placental DAF. The finding of a high anti-Dra titer in two successive pregnancies in this patient, with a positive DAT for the RBCs of one of the two babies at term, differs from published reports, suggesting that a different mechanism might be involved.

Adult↗
PubMed2000

Homologous recombination between different genotypes of hepatitis B virus.

Phylogenetic analysis was used to examine the evolutionary relationships among 99 complete HBV sequences. Analysis revealed nine viral genomes clustered with different genotypes depending on genome region analyzed. This discordance indicated that recombination events occurred during HBV history. The putative breakpoints between genomes of different genotypes have been mapped. Six mosaic genomes representing B/C hybrids were isolated in East Asia and three A/D hybrids in Italy. At least some recombinant strains appear to be fully viable and possess high evolutionary potential. As a result, B/C recombinants overspread through the East Asia region. They were found among the isolates from Japan, China and Indonesia. Our results suggest that recombination is a significant and relatively frequent event in the evolution of HBV genome. A possible mechanism and the implications of recombination for the natural history of HBV, clinically important properties, and phylogenetic reconstruction are discussed.

DNA, Viral↗
PubMed1992

Human spumaretrovirus-related sequences in the DNA of leukocytes from patients with Graves disease.

Viruses, and more particularly retroviruses, have been postulated to play a role in the pathogenesis of autoimmune diseases. In a search for spumaretrovirus infection markers, we screened a group of 29 patients with Graves disease and a representative healthy population (23 subjects) as a control. Southern blot hybridization under stringent conditions, of patients' DNA extracted from peripheral blood lymphocytes, with a spumaretrovirus-specific genomic probe derived from the human spumaretrovirus (HSRV) prototype, gave a positive signal in 10 cases. Moreover, by PCR, HSRV-related sequences were detected in the DNA of 19 patients (66%). Positive DNA samples in Southern blots were also positive in PCR for all regions tested (gag, bel1, bel2, long terminal repeat). Amplified (gag and bel2) products were cloned and sequenced; they showed high homology with HSRV. On the other hand, all 23 control subjects were negative by both procedures. Sera from both populations were examined for the presence of antibodies reactive with antigens of the spumaretrovirus family. These sera were negative by several immunodetection techniques: ELISA, indirect immunofluorescence, serum neutralization, and Western blotting. These results strongly suggest the existence of an association between Graves disease and the presence of HSRV-related infection markers.

Animals↗
PubMed1991

Detection of HTLV-1 gag related sequences in leucocyte DNA from patients with polyendocrinopathies (Basedow-Graves' disease and insulin-dependent diabetes).

Relationships with retroviruses have recently been found in different human pathologies as autoimmune diseases which would be associated with the presence and eventually the expression of retroviral sequences. Detection of the presence of HTLV-1 and HIV-1 homologous sequences and their expression was realised on lymphocytes of 14 patients with polyendrocrinopathies (Basedow-Graves' disease and insulin-dependent diabetes) and four relatives of one index case. No antibodies to HTLV-1 and HIV-1 could be detected by Western blot and Elisa tests. HTLV-1 related sequences were revealed by Southern blot (SB) in 5 out of 18 subjects' DNA. Analyses of all DNA were performed by polymerase chain reaction (PCR). Seven DNA, including the 5 previously positive in SB, and two relatives (father and grandfather), negative in SB, contained HTLV-1-gag related sequences, but neither pol nor pX regions. Concerning HIV-1, all 18 DNA examined were negative by both methods. DNA of ten clinically healthy donors were found to be negative with the same tests.

Aged↗
PubMed1989

Characterization of HTLV-I isolates and T lymphoid cell lines derived from French West Indian patients with tropical spastic paraparesis.

Lymphoid cell lines derived from the peripheral blood of French West Indian patients with HTLV-I sero-positive Tropical Spastic Paraparesis and HTLV-I isolates were characterized. While patients' peripheral blood lymphocytes did not express detectable HTLV-I antigens when uncultured, they did so after short-term culture. Established cell lines were of T-cell lineage: CD2+, CD3+, CD4+, CD7+, WT31+ with activated T-cell markers CD25+, DR+ and a clonal rearrangement of the beta and gamma genes of the T-cell receptor. HTLV-I antigens were detected in cell lines by indirect immunofluorescence, Western blot and radio-immunoprecipitation assays. After 4 months in culture, low levels of Mg2+ dependent reverse transcriptase activity were detected and electron microscopy revealed numerous type-C retroviral particles similar to HTLV-I virions. Western blot and radio-immunoprecipitation analysis of purified viruses revealed gp46, p24, p19 and Pr53gag proteins similar to those detected in HUT 102 and MT2 cell lines. Deep analysis of env-coded precursor of one TSP versus ATL isolates revealed minor differences in their molecular weights. Southern blot analysis using 32P HTLV-I env gene as a probe showed the presence of HTLV-I proviral fragments clonally integrated into the genome of the cell lines. Our data suggest that HTLV-I isolated from Tropical Spastic Paraparesis does not differ significantly from the leukemogenic prototypes. Does HTLV-I induce either acute lymphoproliferative diseases or chronic neuromyelopathies depending upon as yet unknown co-factors? This question remains to be determined.

Blotting, Southern↗
PubMedDate not supplied

Replication of human immunodeficiency virus in HL-60 cells.

HL-60 cells carrying the CD4 marker could be productively infected with human immunodeficiency virus (HIV) but did not form syncytia, though 11-14 days p.i., there was a transient decrease in cell multiplication and viability. After prolonged passage, a subpopulation of HL-60 cells was selected. The virus produced differed from the initial input virus grown on CEM cells: the virions lacked knobs, were either empty or had abnormal cores, had a higher ratio p24/gp41,gp110 and were less infectious. After prolonged passage, virus was produced which was fully infectious for CEM but not for fresh HL-60 cells, and which ressembled the input virus with respect to morphology and p24/gp41,gp110 ratio.

Antigens, Differentiation↗
PubMedDate not supplied

Does laparoscopic cholecystectomy influence peri-sinusoidal cell activity?

BACKGROUND/AIMS: To investigate the influence of laparoscopic procedures on perisinusoidal cell function. METHODOLOGY: In 31 patients who underwent laparoscopic cholecystectomy for symptomatic cholelithiasis, the serum levels of beta-N-acetyl hexosaminidase (beta-NAH) and hyaluronic acid (HA) were measured. Six female patients, who underwent other laparoscopic procedures, not involving the hepatobiliary system, served as controls. RESULTS: HA serum levels increased significantly in both study and control groups, while beta-NAH serum levels remained within normal values. Post-operative AST and ALT serum levels increased significantly only in the study group. No elevation of serum ALP was noted in any of our patients, and post-operative bilirubin levels did not increase in patients with normal pre-operative levels. CONCLUSIONS: Laparoscopic procedures caused detectable damage to Kupffer and endothelial cells as reflected by elevation of post-operative HA serum levels. The damage to the liver hepatocytes and perisinusoidal cells has no clinical significance and the laparoscopic procedure itself is the probable cause of the Kupffer and endothelial cells damage, while other mechanisms caused damage to the hepatocytes.

Adult↗