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J Exp Med. 2001 Feb 5;193(3):271-80.
The relative importance of T cell subsets in immunity and immunopathology of airborne Mycobacterium tuberculosis infection in mice.

Mogues T, Goodrich ME, Ryan L, LaCourse R, North RJ.

The Trudeau Institute, Saranac Lake, New York 12983, USA.

Wild-type (WT) and targeted-mutant mice incapable of making alphabeta T cells, gammadelta T cells, class I major histocompatibility complex (MHC), class II MHC, interferon (IFN)-gamma, or inducible nitric oxide synthase (NOS2), were infected with Mycobacterium tuberculosis (Mtb) by aerosol, and monitored over time for their ability to (a) control infection, (b) develop histopathology at sites of infection, and (c) survive. WT mice acquired the ability to control and to hold infection at a stationary level from day 20 on. This was associated with the development of a macrophage-dominated alveolitis at sites of infection, with increased synthesis of IFN-gamma and NOS2 mRNA, and with an median survival time (MST) of 258.5 d. In the absence of alphabeta T cells, Mtb grew progressively and rapidly to induce a necrotic, neutrophil-dominated lung pathology that killed mice with an MST of 48 d. In the absence of CD4-mediated immunity (class II(-/-) mice), progressive bacterial growth continued in the lungs and in other organs beyond day 20, resulting in an MST of 77 d. By contrast, in the absence of CD8 T cell-mediated immunity, lung infection was controlled at a 1 log higher stationary level that induced a similar histopathologic response to that of WT mice, and resulted in an MST of 232 d.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11157048&dopt=Abstract

J Exp Med. 2001 Feb 5;193(3):339-51.
Interleukin 12 p40 production by barrier epithelial cells during airway inflammation.

Walter MJ, Kajiwara N, Karanja P, Castro M, Holtzman MJ.

Department of Medicine, Washington University School of Medicine, St. Louis, Missouri 63110, USA.

Human airway epithelial cells appear specially programmed for expression of immune response genes implicated in immunity and inflammation. To better determine how this epithelial system operates in vivo, we analyzed its behavior in mouse models that allow for in vitro versus in vivo comparison and genetic modification. Initial comparisons indicated that tumor necrosis factor alpha induction of epithelial intercellular adhesion molecule 1 required sequential induction of interleukin (IL)-12 (p70) and interferon gamma, and unexpectedly localized IL-12 production to airway epithelial cells. Epithelial IL-12 was also inducible during paramyxoviral bronchitis, but in this case, initial IL-12 p70 expression was followed by 75-fold greater expression of IL-12 p40 (as monomer and homodimer). Induction of IL-12 p40 was even further increased in IL-12 p35-deficient mice, and in this case, was associated with increased mortality and epithelial macrophage accumulation. The results placed epithelial cell overgeneration of IL-12 p40 as a key intermediate for virus-inducible inflammation and a candidate for epithelial immune response genes that are abnormally programmed in inflammatory disease. This possibility was further supported when we observed IL-12 p40 overexpression selectively in airway epithelial cells in subjects with asthma and concomitant increases in airway levels of IL-12 p40 (as homodimer) and airway macrophages. Taken together, these results suggest a novel role for epithelial-derived IL-12 p40 in modifying the level of airway inflammation during mucosal defense and disease.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11157054&dopt=Abstract

J Exp Med. 2001 Feb 5;193(3):405-11.
Dendritic cells cross-present latency gene products from Epstein-Barr virus-transformed B cells and expand tumor-reactive CD8(+) killer T cells.

Subklewe M, Paludan C, Tsang ML, Mahnke K, Steinman RM, Munz C.

Laboratory of Cellular Physiology and Immunology, The Rockefeller University, New York, New York 10021, USA.

Dendritic cells (DCs) are not targets for infection by the transforming Epstein-Barr virus (EBV). To test if the adjuvant role of DCs could be harnessed against EBV latency genes by cross-presentation, DCs were allowed to process either autologous or human histocompatibility leukocyte antigen (HLA)-mismatched, transformed, B lymphocyte cell lines (LCLs) that had been subject to apoptotic or necrotic cell death. After phagocytosis of small numbers of either type of dead LCL, which lacked direct immune-stimulatory capacity, DCs could expand CD8(+) T cells capable of killing LCLs that were HLA matched to the DCs. Necrotic EBV-transformed, major histocompatibility complex (MHC) class I-negative LCLs, when presented by DCs, also could elicit responses to MHC class II-negative, EBV-transformed targets that were MHC class I matched to the DCs, confirming efficient cross-presentation of LCL antigens via MHC class I on the DC. Part of this EBV-specific CD8(+) T cell response, in both lytic and interferon gamma secretion assays, was specific for the EBV nuclear antigen (EBNA)3A and latent membrane protein (LMP)2 latency antigens that are known to be expressed at low levels in transformed cells. The induced CD8(+) T cells recognized targets at low doses, 1-10 nM, of peptide. Therefore, the capacity of DCs to cross-present antigens from dead cells extends to the expansion of high affinity T cells specific for viral latency antigens involved in cell transformation.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11157061&dopt=Abstract

Blood. 2001 Feb 1;97(3):601-7.
Interferon-inducible protein 10, monokine induced by interferon gamma, and interferon-inducible T-cell alpha chemoattractant are produced by thymic epithelial cells and attract T-cell receptor (TCR) alphabeta+ CD8+ single-positive T cells, TCRgammadelta+ T cells, and natural killer-type cells in human thymus.

Romagnani P, Annunziato F, Lazzeri E, Cosmi L, Beltrame C, Lasagni L, Galli G, Francalanci M, Manetti R, Marra F, Vanini V, Maggi E, Romagnani S.

Department of Physiopathology, Endocrinology Unit, and the Department of Internal Medicine, University of Florence, Florence, Italy.

Strong reactivity for interferon-inducible protein 10 (IP-10), monokine induced by interferon gamma (Mig), and interferon-inducible T-cell alpha chemoattractant (I-TAC) was found in epithelial cells mainly localized to the medulla of postnatal human thymus. The CXC chemokine receptor common to the 3 chemokines (CXCR3) was also preferentially expressed in medullary areas of the same thymuses and appeared to be a property of 4 distinct populations: CD3+ T-cell receptor (TCR) alphabeta+ CD8+ single-positive (SP) T cells, TCRgammadelta+ T cells, natural killer (NK)-type cells, and a small subset of CD3+(low) CD4+ CD8+ TCRalphabeta+ double-positive (DP) T cells. IP-10, Mig, and I-TAC showed chemoattractant activity for TCRalphabeta+ CD8+ SP T cells, TCRgammadelta+ T cells, and NK-type cells, suggesting their role in the migration of different subsets of mature thymocytes during human thymus lymphopoiesis.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11157474&dopt=Abstract

Circ Res. 2001 Feb 2;88(2):217-22.
Polymorphisms and promoter overactivity of the p22(phox) gene in vascular smooth muscle cells from spontaneously hypertensive rats.

Zalba G, San Jose G, Beaumont FJ, Fortuno MA, Fortuno A, Diez J.

Vascular Pathophysiology Unit, School of Medicine, University of Navarra, Pamplona, Spain.

In a previous study, we found that the p22(phox) subunit of the NADH/NADPH oxidase is overexpressed in vascular smooth muscle cells (VSMCs) from spontaneously hypertensive rats (SHRs) with enhanced vascular production of superoxide anion ((.)O(2)(-)). Thus, we have investigated whether changes in the sequence or activity of the promoter region of p22(phox) gene are present in SHRs. To carry out this analysis, first of all, we characterized the rat gene structure and promoter region for the p22(phox) subunit. The p22(phox) gene spans approximately 10 kb and contains 6 exons and 5 introns. Primer extension analysis indicated the transcriptional start site 100 bp upstream from the translational start site. The immediate promoter region of the p22(phox) gene does not contain a TATA box, but there are a CCAC box and putative recognition sites for nuclear factors, such as SP1, gamma-interferon, and nuclear factor-kappaB. Using reporter-gene transfection analysis, we found that this promoter was functional in VSMCs. Furthermore, we observed that p22(phox) promoter activity was significantly higher in VSMCs from SHRs than from normotensive Wistar-Kyoto rats. In addition, we found that there were 5 polymorphisms in the sequence of p22(phox) promoter between Wistar-Kyoto rats and SHRs and that they were functional. The results obtained in this study provide a tool to explore the mechanisms that regulate the expression of p22(phox) gene in rat VSMCs. Furthermore, our findings show that changes in the sequence of p22(phox) gene promoter and in the degree of activation of VSMCs are responsible for upregulated expression of p22(phox) in SHRs.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11157675&dopt=Abstract

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