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Pathogen research abs 1 || Pathogen research abs 2 || Pathogen research abs 3 || Pathogen research abs 4 || Pathogen research abs 5 || Hormone and endocrine research abs 1 || Hormone and endocrine research abs 2 || Hormone and endocrine research abs 3 || Hormone and endocrine research abs 4 || Hormone and endocrine research abs 5 || Follicle and follicular cells research abs 1 || Interferon research abs 1

Anal Biochem. 2001 Feb 15;289(2):173-86.
Fast transient cytokine-receptor interactions monitored in real time by reflectometric interference spectroscopy.

Piehler J, Schreiber G.

Department of Biological Chemistry, The Weizmann Institute of Science, 76100 Rehovot, Israel. piehleailer.uni-marburg.de

Investigating protein-protein interactions by mutational analysis requires practical techniques for quantifying rate constants and equilibrium constants over several orders of magnitude with reasonably high sample throughput. We have employed spectroscopic interferometry for label-free monitoring of the interaction between the cytokine interferon alpha2 (IFNalpha2) and the extracellular domain of its receptor ifnar2 (ifnar2-EC). We implemented a versatile surface chemistry for the glass substrate of this transducer for covalent immobilization of proteins. Affinity capturing with a monoclonal anti-ifnar2-EC antibody (mAb) followed by crosslinking with a second, noncompetitive mAb provided stable, but still reversible, immobilization of ifnar2-EC. We measured kinetics and affinity of numerous of mutants of IFNalpha2 and ifnar2-EC. Dissociation rate constants up to 0.3 s(-1) and association rate constants up to 3 x 10(6) M(-)1 s(-1) were resolved by the system. Dissociation constants down to 200 microM were measured with protein concentrations up to 50 microM without no background signal or nonspecific binding. The instrument detection limit is approximately 10 pm without the need for temperature stabilization or referencing channels. The system proved effective for large-scale mutational analysis involving alanine scanning mutagenesis and double mutant cycles. 2001 Academic Press.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11161311&dopt=Abstract

Cell Immunol. 2000 Nov 25;206(1):36-50.
Acute myelogenous leukemia blasts as accessory cells during in vitro T lymphocyte activation.

Bruserud O, Ulvestad E.

Division for Hematology, Medical Department, Haukeland University Hospital, N-5021 University of Bergen, Bergen, Norway. oystein.bruseruaukeland.no

The ability of acute myelogenous leukemia (AML) blasts to mediate costimulatory signals during T lymphocyte activation was investigated in an experimental model where monoclonal T cell populations were stimulated with standardized activation signals (anti-CD3, anti-CD2, and anti-CD28 monoclonal antibodies and phytohemagglutinin). Proliferative T cell responses were detected for all AML patients (n = 16) when irradiated leukemia blasts were used as accessory cells during activation. T cell cytokine release was also observed for all patients when nonirradiated AML accessory cells were used, and for most patients a broad cytokine response (interleukin (IL) 2, IL4, IL10, IL13, and interferon-gamma) was detected. However, both T cell proliferation and cytokine release showed a wide variation among AML patients, and T cell responsiveness was in addition dependent both on the nature of the activation signal and on differences between individual T cell clones. The accessory cell function of AML blasts showed no correlation with the release of any single immunomodulatory soluble mediator (IL1beta, IL6, TNF-alpha, soluble IL2 receptors) or the expression of any particular adhesion/costimulatory membrane molecule (CD54, CD58, CD80, and CD86) by the blasts. However, blocking studies with anti-CD58 and anti-CD80/86 monoclonal antibodies demonstrated that both pathways can be involved when AML blasts are used as accessory cells, but the relative importance and the final effects of signaling through these pathways differ between AML populations. Although there is a wide interpatient variation, we conclude that for a majority of patients the native AML blasts can mediate adequate costimulatory signals needed for accessory cell-dependent T cell activation. 2000 Academic Press.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11161436&dopt=Abstract

Cell Immunol. 2000 Dec 15;206(2):107-15.
A mouse model for immunization with ex vivo virus-infected dendritic cells.

Lopez CB, Fernandez-Sesma A, Czelusniak SM, Schulman JL, Moran TM.

Department of Microbiology, Mount Sinai School of Medicine, One Gustave L. Levy Place, New York, New York, 10029, USA.

Dendritic cells (DCs) have been demonstrated to be an important if not essential inducer of cellular immune responses. The ability to grow these cells in vitro may open up new avenues for protective immunizations. In this study we have analyzed the virus-specific memory response generated following immunization with ex vivo-infected bone marrow-derived dendritic cells. We demonstrate that mouse DCs are efficiently infected with influenza virus but do not release infectious progeny virus. Ex vivo-infected DCs secrete interleukin-12 (IL-12) and induce a potent T helper (Th)1-like immune response when injected into mice. This was demonstrated by the generation of cytotoxic T lymphocytes, the production of high levels of gamma-interferon, and undetectable levels of IL-4 upon in vitro restimulation of splenocytes from immunized animals. In addition, the virus-specific antibody response is primarily of the IgG2a isotype, consistent with the expansion of Th1 cells. Animals immunized with DCs infected with X-31 influenza virus and challenged with PR8 influenza virus cleared the infection faster than animals not vaccinated. Thus, infected DCs efficiently activate the cellular immune response and induce heterosubtypic immunity in mice. 2000 Academic Press.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11161442&dopt=Abstract

Cell Immunol. 2000 Dec 15;206(2):125-35.
Antigen presentation to Th1 but not Th2 cells by macrophages results in nitric oxide production and inhibition of T cell proliferation: interferon-gamma is essential but insufficient.

van der Veen RC, Dietlin TA, Pen L, Gray JD, Hofman FM.

Department of Neurology, University of Southern California School of Medicine, Los Angeles, California 90033, USA. vandervsc.usc.edu

The induction and role of nitric oxide (NO) during antigen presentation by macrophages to T helper (Th) cell subsets was examined. When cultured with Th1 clones, macrophage APC produced NO only in the presence of cognate Ag, which in turn suppressed T cell proliferation. IFN-gamma production by the activated Th1 cells was essential for the induction of NO. Th2 cells presented with the same cognate Ag did not induce NO production and proliferated uninhibited. Coactivation of Th1 and Th2 cells specific for the same Ag indicated that Th2 cells did not inhibit NO production, but were sensitive to NO induced by stimulated Th1 cells. Antigenic activation of Th2 cells in the presence of rIFN-gamma resulted in NO-mediated inhibition of proliferation. Th2 cells provided only a cell-associated cofactor, whereas Th1 cells secreted a soluble cofactor for IFN-gamma as well, i.e., TNF-alpha. Finally, a role for IFN-gamma and NO during immune responses was studied in spleen cells obtained from immunized IFN-gamma(-/-) mice. NO production and subsequent inhibition of Ag-specific proliferation ex vivo was observed only after the addition of rIFN-gamma. These studies suggest an IFN-gamma-dependent regulatory role for NO during Ag-specific Th cell activation involving macrophages, with obvious implications for Th subset-dependent immune responses in general. 2000 Academic Press.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11161444&dopt=Abstract

Cell Immunol. 2001 Jan 10;207(1):6-12.
Skewed abrogation of tolerance to a neo self-antigen in double-transgenic mice coexpressing the antigen with interleukin-1beta or interferon-gamma.

Zhang M, Fukushima A, Vistica BP, Kim SJ, Hung L, Wawrousek EF, Egwuagu CE, Lee RS, Whitcup SM, Gery I.

National Eye Institute, National Institutes of Health, Bethesda, Maryland 20892-1857, USA.

Transgenic (Tg) mice expressing hen egg lysozyme (HEL) under the control of the alphaA-crystallin promoter exhibit tolerance to HEL by both their T- and B-cell compartments. Here, we show that double-Tg mice, coexpressing HEL with either interleukin-1beta or interferon (IFN)-gamma, demonstrated unresponsiveness to HEL by their T-cell compartment, but most of them developed antibodies against HEL following a challenge with the antigen. The abrogation of humoral tolerance was more pronounced in the HEL/IL-1 double-Tg mice than in the HEL/IFN-gamma mice. Unlike their controls, double-Tg mice exhibited remarkable levels of variability in their antibody levels. The skewed abrogation of tolerance in the double-Tg mice is proposed to be due to the cytokines' capacity to rescue from clonal deletion small numbers of T cells, which provide help to antibody producing B cells. This notion is supported by the finding that adoptive transfer of small numbers of Th1 or Th2 cells into HEL-Tg mice made possible antibody production similar to that seen in the double-Tg mice. 2001 Academic Press.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11161447&dopt=Abstract

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