IL-2 Regulates SEB Induced Toxic Shock Syndrome in BALB/c Mice

BACKGROUND:Toxic Shock Syndrome (TSS) is characterized by fever, rash, hypotension, constitutional symptoms, and multi-organ involvement and is caused by Staphylococcus aureus enterotoxins such as Staphylococcal Enterotoxin B (SEB). SEB binds to the MHC-IIalpha chain and is recognized by the TCRbeta chain of the Vbeta8 TCR(+) T cells. The binding of SEB to Vbeta chain results in rapid activation of T cells and production of inflammatory cytokines, such as Interleukin-2 (IL-2), Interferon-gamma and Tumor Necrosis Factor-alpha which mediate TSS. Although IL2 was originally identified as the T cell growth factor and was proposed to contribute to T cell differentiation, its role in TSS remains unexplored. METHODOLOGY/PRINCIPAL FINDINGS:Mice were injected with D-Gal (25 mg/mouse). One hour after D-Galactosamine (D-Gal) injection each mouse was injected with SEB (20 microg/mouse. Mice were then observed for 72 hrs and death was recorded at different times. We tested Interleukin-12, IFNgamma, and IL-2 deficient mice (IL-2(-/-)), but only the IL-2 deficient mice were resistant to SEB induced toxic shock syndrome. More importantly reconstitution of IL-2 in IL-2 deficient mice restored the shock. Interestingly, SEB induced IL-2 production from T cells was dependent on p38MAPK activation in macrophages as inhibition of it in macrophages significantly inhibited IL-2 production from T cells. CONCLUSION:This study shows the importance of IL -2 in TSS which has not been previously explored and it also shows that regulating macrophages function can regulate T cells and TSS

Amiodarone-Induced Liver Injury and Cirrhosis.

We present a case report of an 80-year-old woman with volume overload thought initially to be secondary to heart failure, but determined to be amiodarone-induced acute and chronic liver injury leading to submassive necrosis and bridging fibrosis consistent with early cirrhosis. Her histopathology was uniquely absent of steatosis and phospholipidosis, which are commonly seen in AIC

The role of CD4(+) and CD8(+) T cells on antibody production by murine Peyer's patch cells following mucosal presentation of Actinomyces viscosus

The aim of this study was to determine the role of CD4 and CD8 cells on specific antibody production by murine Peyer's patch (PP) cells after oral immunization with Actinomyces viscosus in mice. Female DBA/2 mice were orally immunized with three low doses of heat-killed A. viscosus. Sham-immunized mice served as a control group. Mice were depleted of CD4 or CD8 cells by intraperitoneal injection of anti-CD4 or anti-CD8 antibodies daily for 3 days before oral immunization. One week after the last oral immunization, PPs were removed and cell suspensions were cultured with A. viscosus. Specific antibody production in the culture supernatants was assessed by enzyme-linked immunosorbent assay. The results showed that oral immunization with A. viscosus induced a predominant specific immunoglobulin A (IgA) response by PP cells and, to a lesser extent, IgM antibodies. Depletion of CD4 but not CD8 cells suppressed the production of specific antibodies. These results suggest that oral immunization with low doses of A. viscosus may induce the production of specific antibodies by murine PP cells in a CD4-cell-dependent fashion

MicroRNAs Distinguish Burkitt Lymphoma from the Molecular Subsets of Diffuse Large B Cell Lymphoma

50th Annual Meeting of the American-Society-of-Hematology, San Francisco, CA, 06-09 December 2008. In Blood, v. 112 n. 11, p. 115

Primary cutaneous anaplastic large cell lymphoma of the vulva: A typical cutaneous lesion with an 'atypical' presenting site

10.1007/s12185-009-0395-1International Journal of Hematology903388-391IJHE

A comprehensive identification of the microrna transcriptome and its application in B cell malignancies

Poster Board 2-380: abstract 2403BACKGROUND: MicroRNAs are 18-22 nucleotide-long RNA molecules that regulate expression of genes. We and others have previously demonstrated a role for microRNAs in the pathogenesis of B cell malignancies. Computational predictions suggest that the human genome encodes several thousand microRNAs. Thus far, about 700 microRNAs have been discovered in humans, including over 200 new microRNAs in the past year alone. The ongoing discovery of microRNAs makes it difficult to comprehensively study their role in a disease group. The advent of high throughput sequencing allows the simultaneous identification of millions of transcripts, thereby providing a sensitivity that is several orders of magnitude higher than conventional methods. We hypothesized that high throughput sequencing would be an effective tool to comprehensively identify microRNAs in normal and malignant B cells …link_to_OA_fulltex