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Infect Immun. 2003 May;71(5):2693-703.
Quantitative evaluation of inflammatory and immune responses in the early stages of chronic Helicobacter pylori infection.

Straubinger RK, Greiter A, McDonough SP, Gerold A, Scanziani E, Soldati S, Dailidiene D, Dailide G, Berg DE, Simpson KW.

College of Veterinary Medicine, Cornell University, Ithaca, New York 14853, USA.

The early consequences of Helicobacter pylori infection and the role of bacterial virulence determinants in disease outcome remain to be established. The present study sought to measure the development of host inflammatory and immune responses and their relationship to the putative bacterial virulence factors cag pathogenicity island (cagPAI), vacA allele, and oipA in combination with bacterial colonization density in a feline model of the early stages of H. pylori infection. Gastric tissues obtained from infected and uninfected cats were evaluated for H. pylori ureB, cagPAI, vacA allele, and oipA and colonization density (urease, histology, and real-time PCR). Inflammation was assessed by measuring mRNA upregulation of gamma interferon (IFN-gamma), interleukin (IL)-1 alpha, IL-1 beta, IL-4, IL-6, IL-8, IL-10, and IL-12 p40 and histopathology. The mucosal immune response was characterized by morphometric analysis of lymphoid follicles and by differentiating lymphocyte populations with antibodies against surface markers. Infecting H. pylori strains were positive for vacAs1 but lacked cagPAI and an active oipA gene. Colonization density was uniform throughout the stomach. Upregulation of IFN-gamma, IL-1 alpha, IL-1 beta, and IL-8 and increased severity of inflammatory infiltrates and fibrosis were observed in infected cats. The median number and total area of lymphoid aggregates were 5 and 10 times greater, respectively, in the stomachs of infected than uninfected cats. Secondary lymphoid follicles in uninfected cats were rare and positive for BLA.36 and B220 but negative for CD3 and CD79 alpha, whereas in infected cats they were frequent and positive for BLA.36, CD79 alpha, and CD3 but negative for B220. Upregulation of IFN-gamma, IL-1 alpha, IL-1 beta, and IL-8 and marked hyperplasia of secondary lymphoid follicles are early consequences of H. pylori infection in cats. The response appears to be similar to that of infected people, particularly children, can develop independently of the pathogenicity factors cagPAI and oipA, and is not correlated with the degree of colonization density or urease activity.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12704144&dopt=Abstract

J Virol. 2001 Mar;75(5):2458-61.
Functional impairment of simian immunodeficiency virus-specific CD8+ T cells during the chronic phase of infection.

Vogel TU, Allen TM, Altman JD, Watkins DI.

Wisconsin Regional Primate Research Center, University of Wisconsin, Madison, Wisconsin 53715 , USA.

In an attempt to determine why high frequencies of circulating virus-specific CD8+ T cells are unable to control human immunodeficiency virus and simian immunodeficiency virus (SIV) replication, we assessed the functional nature of SIV-specific CD8+ lymphocytes. After vaccination and early after infection, nearly all tetramer-staining CD8+ cells produced gamma interferon in response to their specific stimulus. However, by 4 months postinfection with pathogenic SIVmac239, signs of functional impairment in the CD8+ T-cell compartment were detected which might prevent these T cells from efficiently controlling the infection during the chronic phase.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11160749&dopt=Abstract

Mol Hum Reprod. 2001 Feb;7(2):185-94.
Fgl2 prothrombinase expression in mouse trophoblast and decidua triggers abortion but may be countered by OX-2.

Clark DA, Ding JW, Yu G, Levy GA, Gorczynski RM.

Department of Medicine, Pathology & Molecular Medicine, and Department of Obstetrics & Gynecology, McMaster University, 1200 Main St West, Room 3V39, Hamilton, Ontario, Canada L8N 3Z5. clarkhs.McMaster.ca

Spontaneous abortion of normal karyotype embryos in mice and in humans is associated with an increase in uterine T helper (Th) 1 type proinflammatory cytokines, tumour necrosis factor (TNF)-alpha, interferon-gamma and interleukin (IL)-1, and a deficiency of Th2/3 type cytokines, IL-4, IL-10, and transforming growth factor (TGF)-beta2. In mice, Th1 cytokines up-regulate a novel prothrombinase, fgl2, which via thrombin, leads to activation of polymorphonuclear leukocytes that terminate the pregnancy. Here we show that Th1 cytokines up-regulate fgl2 mRNA in fetal trophoblast and secondary decidua of CBA/JxDBA/2 and CBA/JxBALB/c matings, and promote fibrin deposition. This pattern is accompanied by a high rate of abortion. However, the spontaneous abortion rates in abortion-prone CBAxDBA/2 matings and in low abortion rate CBAxBALB/c matings were significantly lower than that expected from the frequency of implantations with high levels of fibrin and fgl2 mRNA(hi). As the glycoprotein OX-2 occurs in the pregnant rat uterus and can deviate cytokine responses to Th2/3, we investigated OX-2 in pregnant CBA/J mice. We found OX-2 mRNA was present at the same sites as fgl2 mRNA, but was reduced in response to Th1 cytokines. Furthermore, anti-OX-2 raised the abortion rate to predicted levels, while recombinant OX-2 dramatically reduced the abortion rate. Fgl2 prothrombinase may provide a mechanism explaining pregnancy loss, and conversely, successful pregnancy may be due in part to OX-2-dependent activation of maternal tolerance mechanisms at the feto-maternal interface.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11160845&dopt=Abstract

Mol Hum Reprod. 2001 Feb;7(2):195-200.
Soluble HLA-G influences the release of cytokines from allogeneic peripheral blood mononuclear cells in culture.

Kanai T, Fujii T, Kozuma S, Yamashita T, Miki A, Kikuchi A, Taketani Y.

Department of Obstetrics and Gynecology, Faculty of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655 Japan.

Exquisitely regulated cytokine balance during early pregnancy is thought to be necessary for promoting survival of the fetal allograft. Our previous studies have demonstrated that membrane-bound human leukocyte antigen (mHLA-G) expressed on trophoblasts is one of the key factors in regulating cytokine balance by shifting the Th1/Th2 balance toward Th2 polarization, a favourable milieu for the maintenance of pregnancy. Given that trophoblasts secrete soluble HLA-G (sHLA-G), we examined its biological roles in comparison with mHLA-G. We cultured peripheral blood mononuclear cells (PBMC) with either the HLA-A and -B-deficient B lymphoblast cell line (721.221 cells) or the same cell line transfected with mHLA-G (721.221-G1 cells), in the presence or absence of recombinant sHLA-G. Cytokine concentrations in the culture media were determined by enzyme-linked immunosorbent assay. In contrast to mHLA-G protein, sHLA-G stimulated the release of tumour necrosis factor (TNF)-alpha and interferon (IFN)-gamma, whereas it reduced the release of interleukin (IL)-3, regardless of the presence of the presence of a stimulatory effect of the mHLA-G-expressing cells. Although mHLA-G reduced the release of IL-4, sHLA-G did not have any effect. Conversely, sHLA-G stimulated the release of IL-10 whereas mHLA-G was without effect. These results suggest that sHLA-G regulates the release of cytokines from PBMC chiefly by counterbalancing mHLA-G, and thereby may play a role in maintaining pregnancy.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11160846&dopt=Abstract

Anal Biochem. 2001 Feb 15;289(2):137-46.
Inferred hepatitis C virus quasispecies diversity is influenced by choice of DNA polymerase in reverse transcriptase-polymerase chain reactions.

Mullan B, Kenny-Walsh E, Collins JK, Shanahan F, Fanning LJ.

Hepatitis C Unit, Department of Medicine, National University of Ireland, Clinical Sciences Building, Wilton, Cork, Ireland.

The hepatitis C virus (HCV) is known to circulate in vivo as a quasispecies, a population of closely related, but genetically nonidentical virions. HCV reverse transcriptase (RT)-(nested) polymerase chain reaction (PCR) strategies are used to study quasispecies diversity at certain important viral genetic loci, predominantly at hypervariable region 1 (HVR 1) of the E2 envelope gene, and the interferon sensitivity determining region (ISDR) of the nonstructural 5a (NS5a) gene. We have found that the choice of DNA polymerase employed in viral PCR has effects on the inferred viral diversity at two distinct loci on the HCV genome. Nested HVR 1 and ISDR PCR was performed with both proofreading (Pwo) and nonproofreading (Taq) DNA polymerases on identical cDNA derived from three separate HCV-positive sera. Amplicons were cloned and sequences determined for 18-20 individual clones per sample. Quasispecies diversity determined from HVR 1 and ISDR PCR products showed that there was a marked effect on the inferred diversity depending on which DNA polymerase was employed in the PCR. The deduced amino acid sequences of the major variants within each specimen were identical for both Taq and Pwo DNA polymerase-mediated PCRs. However, a greater number of minor variants were observed in the Taq-generated amplicons, 80% of which were not observed in the Pwo-generated amplicons. Primer editing in the Pwo-generated amplicons was observed in 19% (20/104) of clones examined. Single-strand conformational polymorphism analysis of multiple replicates of each amplicon revealed good intra-PCR reproducibility in terms of genetic heterogeneity, and that as such the observations were not due to poor PCR reproducibility. The use of nonproofreading DNA polymerases to assess viral diversity can yield an incorrect quasispecies spectrum and affect RT-PCR assay performance. The contribution of Taq-induced errors and lack of adaptability of primers to potentially heterologous template-binding sites indicate that proofreading DNA polymerases should be the enzyme of choice in these systems. 2001 Academic Press.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11161307&dopt=Abstract

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