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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





J Invest Dermatol. 2001 Jan;116(1):102-9.
Dermal fibroblasts sustain proliferation of activated T cells via membrane-bound interleukin-15 upon long-term stimulation with tumor necrosis factor-alpha.

Rappl G, Kapsokefalou A, Heuser C, Rossler M, Ugurel S, Tilgen W, Reinhold U, Abken H.

Department of Dermatology, The Saarland University Hospital, Homburg/Saar, Germany.

In chronic inflammatory conditions, mononuclear cells infiltrate the connective tissue attracted by fibroblast-secreted chemokines. The role of fibroblasts in sustaining the lymphocyte immune response upon cellular infiltration is so far unresolved. We here report that, upon prolonged stimulation with tumor necrosis factor-alpha, dermal fibroblasts enhance proliferation of activated T cells whereas unstimulated fibroblasts do not. T cell growth stimulation requires cell contact of tumor necrosis factor-alpha stimulated fibroblasts to T cells and is not due to soluble factors. Growth stimulation is substantially blocked by neutralizing antibodies to interleukin-15. Fluorescence-activated cell sorter analyses revealed that tumor necrosis factor alpha stimulated fibroblasts expose interleukin-15 in a membrane-bound form on the cell surface whereas nonstimulated fibroblasts and interferon-gamma treated fibroblasts do not. The amount of membrane interleukin-15 increases with the duration of tumor necrosis factor-alpha stimulation for at least 3 d. Unstimulated fibroblasts, however, accumulate interleukin-15 in the cytoplasm. No interleukin-15 could be detected in the culture supernatant. Immunohistochemical analyses confirmed membrane interleukin-15 on dermal fibroblasts in discoid lupus erythematosus skin lesions whereas no membrane interleukin-15 was found on the surface of fibroblasts in healthy skin. We conclude that dermal fibroblasts upon long-term tumor necrosis factor-alpha stimulation during chronic inflammation are involved via membrane-bound interleukin-15 in stimulating proliferation of accumulated, activated T cells.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11168804&dopt=Abstract



J Invest Dermatol. 2001 Jan;116(1):188-93.
Chromosomally clonal T cells in the skin, blood, or lymph nodes of two Sezary syndrome patients express CD45RA, CD45RO, CDw150, and interleukin-4, but no interleukin-2 or interferon-gamma.

Karenko L, Nevala H, Raatikainen M, Franssila K, Ranki A.

Department of Dermatology, Helsinki University Central Hospital, Helsinki, Finland. Leena.Karenkus.fi

Cutaneous T cell lymphomas are considered to represent a clonal malignancy of mature T lymphocytes of the T helper memory subtype. A method enabling the direct identification of clonal malignant cells in tissue and, at the same time, identification of the surface molecules they express has not been available, however. We have developed an application of the FICTION technique (simultaneous fluorescence immunophenotyping and interphase cytogenetics) to be used on fresh blood, skin, and lymph node samples. A prerequisite for this method is the characterization of a moleculocytogenetic clone in order to select the proper probes. With this method, we demonstrate that the true malignant cells express CD3, CD4, and CD45RO in the blood, skin, and lymph nodes of two Sezary syndrome patients. The majority of these cells express also CD45RA (albeit of varying intensity) and CDw150. The cytokine expression pattern of the clonal cells in skin and lymph nodes was interleukin-2 and interferon-gamma negative and interleukin-4 positive. Interleukin-10 expression varied. The malignant cells did not express granzyme B, thus indicating that they do not have cytotoxic properties. Clonal cells with the same constant phenotype could be found even in lymph nodes with not yet morphologically identifiable malignant cells. This is the first report of the FICTION method applied directly on skin tissue. With this method we demonstrated that the chromosomally clonal cells in these two cases of Sezary syndrome could be intermediate forms between naive CD45RA+ and CD45RO+ Th2 cells.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11168816&dopt=Abstract



fsnet.co.uk

BACKGROUND: Antineutrophil cytoplasm antibodies (ANCAs) are implicated in the pathogenesis of systemic vasculitis. We asked whether ANCA could induce nitric oxide (NO) release from human neutrophils and, if so, whether this NO production was dependent on NO synthase (NOS) activity. METHODS: Neutrophil NO production was measured using a chemiluminescence assay, and NOS activity was determined by the conversion of [(14)C] L-arginine to [(14)C] L-citrulline and NOS mRNA expression by reverse transcription-polymerase chain reaction (RT-PCR). RESULTS: Human neutrophils isolated from healthy donors were incubated at 37 degrees C with human ANCA, normal human IgG, murine monoclonal myeloperoxidase ANCA, murine proteinase-3 ANCA, or their respective isotypic controls for 6 to 12 hours in RPMI. Both human and monoclonal ANCA led to a dose-dependent increase of NO compared with control IgG. Neutrophils, either freshly isolated or incubated for seven hours with murine monoclonal myeloperoxidase ANCA, proteinase-3 ANCA, or a mixture of interleukin-1 beta, tumor necrosis factor-alpha, interferon-gamma plus lipopolysaccharide showed no NOS activity with low conversion rates of [(14)C] L-arginine to [(14)C] L-citrulline, which could not be inhibited by N(G)-monomethyl-L-arginine (NOS inhibitor). To detect NOS mRNA expression, RT-PCR was performed using oligonucleotide primers derived from mRNA sequences of either human constitutive endothelial NOS (eNOS), constitutive neuroneal NOS (nNOS), or human hepatocyte inducible NOS (iNOS). There was no expression of either eNOS, nNOS, or iNOS in untreated, human and murine monoclonal ANCA-treated, or cytokine-treated neutrophils. CONCLUSION: These data suggest that human neutrophils produce NO in response to ANCA but in a NOS-independent way. NO can be generated from a nonenzymatic interaction between hydrogen peroxide and arginine. We postulate that this is the predominant pathway of NO synthesis in neutrophils, since ANCAs are capable of inducing reactive oxygen species production from neutrophils.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11168940&dopt=Abstract



J Cell Biochem. 2003 May 15;89(2):244-53.
Interferon-gamma induces reactive oxygen species and endoplasmic reticulum stress at the hepatic apoptosis.

Watanabe Y, Suzuki O, Haruyama T, Akaike T.

Department of Biomolecular Engineering, Tokyo Institute of Technology, 4259 Nagatsuda, Midori-ku, Yokohama 226-8501, Japan.

Interferon-gamma (IFN-gamma) induces cell-cycle arrest and p53-independent apoptosis in primary cultured hepatocytes. However, the detailed mechanism, including regulating molecules, is still unclear. In this study, we found that IFN-gamma induced generation of reactive oxygen species (ROS) in primary hepatocytes and that pyrrolidinedithiocarbamate (PDTC), an anti-oxidant reagent, completely suppressed IFN-gamma-induced hepatic apoptosis. PDTC blocked apoptosis downstream from IRF-1 and upstream from caspase activation, suggesting that the generation of ROS occurred between these stages. However, IFN-gamma also induced the generation of ROS in IRF-1-deficient hepatocytes, cells insensitive to IFN-gamma-induced apoptosis. Moreover, a general cyclooxygenase (COX) inhibitor, indomethacin (but not the cyclooxygenase 2-specific inhibitor, NS-398) also inhibited the apoptosis without blocking the generation of ROS. Both PDTC and indomethacin also blocked IFN-gamma-induced release of cytochrome c from mitochondria. These results suggest that ROS are not the only or sufficient mediators of IFN-gamma-induced hepatic apoptosis. In contrast, we also found that IFN-gamma induced endoplasmic reticulum (ER) stress proteins, CHOP/GADD153 and caspase 12, in wild-type primary hepatocytes, but induced only caspase 12 and not CHOP/GADD153 protein in IRF-1-deficient hepatocytes. These results suggest that IFN-gamma induces ER stress in primary hepatocytes. Both the ROS and ER stress induced by IFN-gamma may be complementary mediators that induce apoptosis in primary hepatocytes. J. Cell. Biochem. 89: 244-253, 2003. 2003 Wiley-Liss, Inc.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12704788&dopt=Abstract [PubMed - in process]



Liver. 2001 Feb;21(1):45-9.
Suppression of hepatitis B virus replication mediated by hepatitis A-induced cytokine production.

van Nunen AB, Pontesilli O, Uytdehaag F, Osterhaus AD, de Man RA.

Department of Hepatogastroenterology, Erasmus University Hospital Rotterdam, The Netherlands.

BACKGROUND: Acute hepatitis A virus (HAV) infection can cause severe hepatitis especially in patients with underlying chronic liver disease. In patients with pre-existing chronic hepatitis B (HBV) acute HAV infection can suppress HBV replication. The exact mechanism of HBV suppression during acute HAV infection is still a subject of debate. One mechanism may be the production of HAV infection-induced cytokines leading to suppression of HBV replication and viral clearance. AIM: To evaluate cytokine production and HBV-specific lympho-proliferative responses (LPR) during acute HAV infection in a patient with chronic HBV infection-clearing markers of active HBV replication. DESIGN: Early detection of a case of acute HAV infection in an HBeAg-positive, HBV DNA-positive chronic HBV patient treated with lamivudine. RESULTS: At the time of HAV infection a sharp peak in the gamma-interferon (IFN-gamma) level occurred just before the rise in serum transaminase activity. This was subsequently followed by a decrease in HBV DNA and HBeAg below the limit of detection of the assay. However the HBV-specific T-cell response was not modified. After resolution of the acute HAV infection and withdrawal of antiviral therapy HBV replication relapsed. CONCLUSION: The sharp rise in IFN-gamma production mediated by the acute HAV infection may be pivotal in the suppression of HBV replication in chronic hepatitis B.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11169072&dopt=Abstract







The most ostensive feature that distinguishes us human from chimps and other primates is the lack of bodily hair. During evolutionary process, we have lost the majority of hair. Hair is no longer an essential part of our body, just like appendix. What little hair we still have on our scalp and a few other bodily parts is still regarded as significant for reasons other than biological necessity. Hair loss is naturally accompanied by aging process, although the extent of hair loss and the timing of onset vary widely among individuals. Thus, loss of hair and baldness is considered as a symbol of maturity or old age. Like winkles and other signs of aging, hair loss is not welcome by most people, because we don't welcome aging, and being perceived as an aging person. However, it is alopecia, or premature hair loss that especially concerns certain people.

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DHEA is a natural hormone, and it is produced in our body by the adrenal glands. DHEA has been suggested to provide numerous potential benefits. DHEA (or dehydroepiandrosterone) is converted into androgens (male hormones) or estrogens (female hormones) in the cells. Our bodies produce decreasing amount of DHEA as we get older. various health benefits: To deter aging, improve sexual function/erectile dysfunction, treat cognitive decline, enhance athletic performance, facilitate weight loss, improve strength, prevent osteoporosis, enhance immunomodulation for rheumatic conditions, and treat depression.





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