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Blood. 2001 Jan 15;97(2):523-7.
Interferon resistance of cutaneous T-cell lymphoma-derived clonal T-helper 2 cells allows selective viral replication.

Dummer R, Dobbeling U, Geertsen R, Willers J, Burg G, Pavlovic J.

Department of Dermatology, University Hospital Zurich, and the Department of Virology, University of Zurich, Switzerland. dummeerm.unizh.ch

Cutaneous T-cell lymphomas (CTCL) comprise a heterogeneous group of lymphoproliferative disorders that are characterized by an accumulation of T-lymphocytes in the skin and occasionally in blood known as Sezary syndrome (SS). In most cases the dominant clone displays T-helper 2 cytokines. Because IFN-gamma is a natural inhibitor of T-helper 2 cells and IFN-alpha is frequently used in CTCL, the impact of IFNs on SS-derived purified clonal T-helper 2 cells was studied using anti-Vbeta antibodies. Moreover, IFNs are known to mediate virus resistance in normal cells. The isolated clonal CD4(+) cells, but not the nonclonal CD4(+) cells, appeared resistant to IFN-gamma and IFN-alpha stimulation in terms of human leukocyte antigen up-regulation and MxA induction caused in part by alterations in Stat-1 molecule mRNA and IFNgammaR1 mRNA transcription. The IFN resistance of the patient-derived clonal cells was then targeted by vesicular stomatitis virus infection after IFN-alpha priming, resulting in selective viral replication in clonal cells. In contrast, nonclonal cells of the same patient showed IFN-dependent MxA expression, which is a major mediator protein of viral protection. The IFN resistance of the dominant T-helper 2 cells might be important for lymphomagenesis. Interferon signaling deficiencies can be targeted for purging patients' cells in vitro. Furthermore, this approach may allow specific molecular interventions, resulting in the efficient treatment of CTCL and other IFN-resistant neoplasms such as lung cancer.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11154232&dopt=Abstract

Oral Microbiol Immunol. 2000 Jun;15(3):166-71.
Chemokine expression in Porphyromonas gingivalis-specific T-cell lines.

Gemmell E, Grieco DA, Seymour GJ.

Immunopathology Laboratory, School of Dentistry, University of Queensland, Brisbane, Australia.

Autologous non-T cells (monocytes and B cells) were added to Porphyromonas gingivalis-specific T cell lines established from 9 healthy adults together with P. gingivalis outer membrane antigens for 4-6, 16-18, 24 and 48 h. Flow cytometry was employed to analyze the CD4 and CD8 cells, monocytes and B cells for intracytoplasmic IP-10 (interferon-gamma inducible protein 10), MCP-1 (monocyte chemoattractant protein 1), MIP-1 alpha (macrophage inflammatory protein 1 alpha) and RANTES (regulated on activation normal T cell expressed and secreted) at the four time periods. All cell types were positive for each chemokine throughout the 48-h time period. There were significantly fewer MCP-1-positive cells compared with the other 3 chemokines. However, the percentages of MCP-1, MIP-1 alpha- and RANTES-positive CD8 cells were significantly higher than the percentages of positive CD4 cells in all cultures. IP-10-positive CD4, CD14-positive monocytes and CD19-positive B cells were predominant compared with MIP-1 alpha- and RANTES-positive cells at 24 h. In conclusion, the present study has shown that P. gingivalis-specific T cells, monocytes and B cells produce chemokines in response to P. gingivalis outer membrane antigens, IP-10 being predominant, with MCP-1 being significantly reduced in comparison with IP-10, MIP-1 alpha and RANTES. Increased percentages of CD8 cells were induced to produce chemokines in comparison with CD4 cells, indicating a more preferential action on CD8 rather than CD4 cells.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11154399&dopt=Abstract

Neurosci Lett. 2001 Jan 26;298(1):33-6.
Astrocytic factors down-regulate the expression of major histocompatibility complex-class-II and intercellular adhesion molecule-1 on human monocytes.

Hailer NP, Glomsda B, Blaheta RA.

University Hospital for Orthopaedic Surgery, Friedrichsheim, Marienburgstrasse 2, D-60528 Frankfurt am Main, Germany. hailem.uni-frankfurt.de

Several factors contribute to the maintenance of central nervous system immune privilege and astrocytes have been identified as a major source of immunomodulatory cytokines. To investigate whether hematogenous monocytes are immunologically deactivated by astrocyte-derived factors human monocytes were stimulated with lipopolysaccharide or interferon (IFN)-gamma and treated with the supernatant from pure astrocyte cultures, interleukin (IL)-4, IL-10, or with IL-1-receptor antagonist (1L-1-RA). Flow cytometry demonstrated that the supernatant from astrocyte cultures was the most potent agent in reducing the levels of major histocompatibility complex (MHC)-class-II- as well as intercellular adhesion molecule-1-expression, whereas IL-4, IL-10, and IL-1-RA had only marginal effects. The expression of leukocyte function antigen-1 and very late antigen-4 was not modulated by either factor. In conclusion, astrocytes seem to provide soluble factors that have the capacity to deactivate hematogenous monocytes.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11154829&dopt=Abstract

J Gen Virol. 2003 Jan;84(Pt 1):193-202.
Virus-cell interactions in the induction of type 1 interferon by influenza virus in mouse spleen cells.

Miller JL, Margot Anders E.

Department of Microbiology and Immunology, University of Melbourne, Victoria 3010, Australia.

Inactivated influenza A virus and fixed, virus-infected cells induce type 1 interferon (IFN-alpha/beta) production in murine splenocytes. In this study, we have explored the nature of the virus-spleen cell interaction that leads to IFN-alpha/beta induction and the reason for the poor response to some virus strains. IFN-alpha/beta induction by horse serum-sensitive, but not -resistant, strains of influenza virus was inhibited in the presence of horse serum, indicating that binding of the virus to sialylated cell receptors is a necessary step in the induction process. Furthermore, influenza viruses A/PR/8/34 (H1N1) and A/WS/33 (H1N1), which were poor inducers of IFN-alpha/beta in spleen cells, were shown to have a more active neuraminidase than strains that induced higher IFN levels, and IFN-alpha/beta induction by A/PR/8/34 (H1N1) and A/WS/33 (H1N1) was restored in the presence of a neuraminidase inhibitor. Growth of virus in different cell types altered the level of IFN-alpha/beta induced in spleen cells by particular virus strains, suggesting that the nature of the carbohydrate moieties on the viral glycoproteins may also influence IFN-alpha/beta induction in this system. Consistent with this notion, treatment of egg-grown virus with periodate to oxidize viral carbohydrate greatly reduced its capacity for IFN-alpha/beta induction. Furthermore, induction of IFN-alpha/beta was inhibited in the presence of the saccharides yeast mannan and laminarin. Together these findings indicate: (i) a requirement for interaction of the virus with sialylated receptors on the IFN-producing cell; (ii) an influence of viral carbohydrate on the response; and (iii) possible involvement of a lectin-like receptor on the IFN-producing cell in the induction of IFN-alpha/beta or in regulation of this response.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12533716&dopt=Abstract

Infect Immun. 2003 May;71(5):2447-54.
Differences in gamma interferon production induced by listeriolysin O and ivanolysin O result in different levels of protective immunity in mice infected with Listeria monocytogenes and Listeria ivanovii.

Kimoto T, Kawamura I, Kohda C, Nomura T, Tsuchiya K, Ito Y, Watanabe I, Kaku T, Setianingrum E, Mitsuyama M.

Department of Microbiology, Kyoto University Graduate School of Medicine, Kyoto 606-8501, Japan.

Two pathogenic species in the genus Listeria, Listeria monocytogenes and Listeria ivanovii, are characterized by the production of hemolysins belonging to cholesterol-dependent cytolysins, listeriolysin O (LLO) and ivanolysin O (ILO), respectively. LLO, produced by L. monocytogenes, is able to induce gamma interferon (IFN-gamma) production and contributes to the generation of Th1-dependent protective immunity. On the other hand, nothing is known about the role of ILO, produced by L. ivanovii, in this regard. In this study, we immunized mice with 0.1 50% lethal dose (LD(50)) of L. monocytogenes and L. ivanovii. Protective immunity against a challenge with 10 LD(50) was generated in mice infected with L. monocytogenes, whereas L. ivanovii infection did not induce protection. After immunization, the level of IFN-gamma in serum samples was increased in mice given L. monocytogenes but not in those given L. ivanovii. To determine the IFN-gamma-inducing activity of cytolysins, recombinant protein was constructed. Recombinant ILO exhibited significantly lower IFN-gamma-inducing activity than LLO. By comparing the IFN-gamma-inducing activity of a chimera incorporating LLO and ILO, it was found that domains 1 to 3 of LLO were critical for IFN-gamma-inducing activity while the counterpart in ILO was unable to induce cytokine production. These results suggested that the weak ability of ILO to induce IFN-gamma production is responsible for the failure of L. ivanovii to generate effective protective immunity.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12704115&dopt=Abstract

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