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Circulation. 2001 Jan 30;103(4):525-31.
Association of thrombospondin-1 and cardiac allograft vasculopathy in human cardiac allografts.

Zhao XM, Hu Y, Miller GG, Mitchell RN, Libby P.

Cardiovascular Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA.

BACKGROUND: Despite the expression of angiogenic growth factors in transplanted hearts, neovessel formation appears scant. We therefore hypothesized that cardiac allografts contain endogenous inhibitors of angiogenesis. In particular, we tested the involvement in cardiac allografts of thrombospondin-1 (TSP-1), a matrix glycoprotein that inhibits angiogenesis and facilitates smooth muscle cell (SMC) proliferation. METHODS AND RESULTS: Levels of TSP-1 mRNA in endomyocardial biopsy samples of human cardiac allografts substantially exceeded those in normal hearts. The ratio of TSP to GAPDH mRNA determined with quantitative RT-PCR was 6.54+/-1.6 in cardiac allografts versus 0.26+/-0.02 (P:=0.001) in normal hearts. Analysis in sequential biopsies revealed a strong association between persistent elevation of TSP-1 in allografts and the development of cardiac allograft vasculopathy (CAV). The CAV score was 2.4+/-0.8 in patients with persistent TSP-1 elevation compared with 0.2+/-0.2 in patients without elevation (P:=0.001). Immunohistochemistry demonstrated intense expression of TSP-1 in cardiac allografts, predominantly in cardiac myocytes and neointimal SMCs. In vitro experiments demonstrated that T cells expressed TSP-1, acidic fibroblast growth factor, and vascular endothelial cell growth factor on allogeneic stimulation. Cytokines known to be elevated in cardiac allografts (interleukin-1beta, interferon-gamma, and tumor necrosis factor-alpha) induced TSP-1 in SMCs but inhibited TSP-1 in endothelial cells. CONCLUSIONS: Persistent elevation of TSP-1 in cardiac allografts correlates with the development of CAV. Allogeneic stimulation induces angiogenic growth factors and TSP-1 in T cells. Cytokines differentially regulate TSP-1 expression in SMCs versus endothelial cells. Increased levels of TSP-1 in human cardiac allografts may alter vascular responses to angiogenic growth factors by inhibiting angiogenesis and promoting SMC proliferation characteristic of CAV.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11157717&dopt=Abstract

Infect Immun. 2003 May;71(5):2487-97.
Inhibition of response to alpha interferon by Mycobacterium tuberculosis.

Prabhakar S, Qiao Y, Hoshino Y, Weiden M, Canova A, Giacomini E, Coccia E, Pine R.

Public Health Research Institute, Newark, New Jersey 07103, USA.

We previously reported that infection by Mycobacterium tuberculosis, the causative agent of tuberculosis, leads to secretion of alpha/beta interferon (IFN-alpha/beta). While IFN-alpha/beta ordinarily stimulates formation of signal transducer and stimulator of transcription-1 (STAT-1) homodimers and IFN-stimulated gene factor-3 (ISGF-3), only ISGF-3 is found in infected human monocytes and macrophages. We have now investigated the basis for this unusual profile of transcription factor activation and its consequences for regulation of transcription, as well as the impact of infection on response to IFN-alpha. After infection, IFN-alpha stimulation of STAT-1 homodimers is inhibited in monocytes and macrophages, while stimulation of ISGF-3 increases in monocytes but tends to decline in macrophages. Effects of infection on the abundance of ISGF-3 subunits, STAT-1, STAT-2, and interferon regulatory factor 9, and on tyrosine phosphorylation of STAT-1 and STAT-2 explain the observed changes in DNA-binding activity, which correlate with increased or inhibited transcription of genes regulated by ISGF-3 and STAT-1. Infection by Mycobacterium bovis BCG does not inhibit IFN-alpha-stimulated tyrosine phosphorylation of STAT-1, formation of homodimers, or transcription of genes regulated by STAT-1 homodimers, suggesting that inhibition of the response to IFN-alpha/beta by M. tuberculosis is an aspect of pathogenicity. Thus, this well-known feature of infection by pathogenic viruses may also be a strategy employed by pathogenic bacteria.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12704120&dopt=Abstract

EMBO J. 2001 Feb 1;20(3):362-71.
Influenza B virus NS1 protein inhibits conjugation of the interferon (IFN)-induced ubiquitin-like ISG15 protein.

Yuan W, Krug RM.

Institute for Cellular and Molecular Biology, Section of Molecular Genetics and Microbiology, University of Texas at Austin, Austin, TX 78712, USA.

Of the several hundred proteins induced by interferon (IFN) alpha/beta, the ubiquitin-like ISG15 protein is one of the most predominant. We demonstrate the novel way in which the function of the ISG15 protein is inhibited by influenza B virus, which strongly induces the ISG15 protein: a specific region of the influenza B virus NS1 protein, which includes part of its effector domain, blocks the covalent linkage of ISG15 to its target proteins both in vitro and in infected cells. We identify UBE1L as the E1 enzyme that catalyzes the first activation step in the conjugation of ISG15, and show that the NS1B protein inhibits this activation step in vitro. Influenza A virus employs a different strategy: its NS1 protein does not bind the ISG15 protein, but little or no ISG15 protein is produced during infection. We discuss the likely basis for these different strategies.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11157743&dopt=Abstract

Invest Ophthalmol Vis Sci. 2001 Feb;42(2):372-8.
Cytokine production in a murine model of recurrent herpetic stromal keratitis.

Stumpf TH, Shimeld C, Easty DL, Hill TJ.

Division of Ophthalmology, Department of Pathology and Microbiology, University of Bristol, United Kingdom.

PURPOSE: To determine the pattern of cytokine production in the cornea and its relationship with viral antigens, in our murine model of recurrent ocular herpes simplex virus (HSV)-1 infection. METHODS: Six weeks after corneal inoculation with HSV-1, the eyes of latently infected and control mice were UV irradiated and examined for signs of disease and viral reactivation. The eyes of five mice with recurrent stromal disease and two controls were processed for immunohistochemistry on days 4, 7, 10, and 14 after irradiation. Sections were double stained for viral antigens and one of the following cytokines: interleukin (IL)-1ss, IL-2, IL-4, IL-6, IL-10, IL-12, and interferon (IFN)-gamma. RESULTS: Fifty percent of mice showed signs of recurrent stromal disease, the severity of which peaked on day 10 after UV irradiation. There was a large cellular infiltrate in the stroma of all the corneas with recurrent disease and the predominant cytokines were IL-1ss, IL-6, IL-10, IL-12, and IFN-gamma, all present in large numbers of cells on the days studied. There were very few cells producing IL-2 and IL-4. Control eyes had no significant cytokine-producing cells in the stroma. CONCLUSIONS: These observations suggest that recurrent herpetic stromal keratitis (HSK) may not be characterized by a classic T-helper (Th)1 or Th2 response. However, the large number of IFN-gamma(+) and IL-12(+) cells and the relative absence of IL-4 favors a Th1 response, and despite the numerous IL-10(+) cells, the overall balance of cytokine production appears to be proinflammatory.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11157869&dopt=Abstract

J Clin Endocrinol Metab. 2001 Feb;86(2):903-8.
Effect of tumor necrosis factor-alpha, interferon-gamma, and transforming growth factor-beta on adipogenesis and expression of thyrotropin receptor in human orbital preadipocyte fibroblasts.

Valyasevi RW, Jyonouchi SC, Dutton CM, Munsakul N, Bahn RS.

Division of Endocrinology, Metabolism and Nutrition, Mayo Clinic/Foundation, Rochester, Minnesota 55905, USA.

Graves' ophthalmopathy (GO) is an orbital autoimmune disease that is closely associated with Graves' hyperthyroidism. Examination of retroorbital tissues in GO reveals an accumulation of glycosaminoglycans, increased fat volume, lymphocytic infiltration, and the presence of several inflammatory cytokines. A subpopulation of human orbital fibroblasts can be differentiated in vitro into cells with the morphologic features of adipocytes. We demonstrated recently that these differentiated cultures show increased expression of functional TSH receptor (TSHr). To determine whether the presence of inflammatory cytokines might impact adipogenesis or TSHr expression in these cultures, we treated orbital fibroblasts from normal individuals or GO patients with tumor necrosis factor-alpha (TNF-alpha), interferon-gamma (IFN-gamma), or transforming growth factor-beta. We found that each of these cytokines inhibits TSH-dependent cAMP production and TSHr gene expression, and that TNF-alpha and IFN-gamma also inhibit morphological adipocyte differentiation. When cytokines were added after differentiation, the inhibition was less pronounced. Our results suggest that TNF-alpha, IFN-gamma, and transforming growth factor-beta may act within the orbit in GO to modulate expression of the putative orbital autoantigen, TSHr. In addition, the former two cytokines may play a role in determining the extent to which the volume of the orbital adipose tissue increases in this condition.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11158064&dopt=Abstract

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