In vivo experiments demonstrated that the mean volume and weight of subcutaneous xenografts in nude mice derived from Capan-2 cells transfected with COX-2 siRNA were significantly decreased. COX-2 siRNA could inhibit the growth of Capan-2 pancreatic cancer cells and also decrease the tumorigenicity of Capan-2 cells, implicating a new potential therapeutic target find more in pancreatic cancer.”
“Short chain fatty acids (SCFAs) such as acetate, propionate and butyrate are produced by bacterial fermentation of dietary fiber. The highest
concentrations of SCFAs in the body are found in the colon. Elevated dietary acetate has been shown to have anti-inflammatory effects in mouse models of colitis and inflammatory diseases in peripheral tissues. The details of how dietary SCFAs
stimulate reduced inflammation in peripheral tissues have not been determined. I suggest that SCFA concentrations in peripheral tissues are generally not sufficient to locally produce a significant anti-inflammatory effect from immune cells. Moreover it is possible that elevated SCFA levels in peripheral tissues may actually stimulate an inflammatory response. The hypothesis is presented that preadipocytes and other cells with immune function such as fibroblasts in peripheral tissues elicit an inflammatory innate immune response when exposed to SCFAs at millimolar concentrations. A role for SCFAs in activating an immune response in preadipocytes is possible given the expression of a SCFA receptor in Caspases apoptosis these cells, selleck the demonstration that adipocytes and preadipocytes have immunity related functions, the observation that 2 mM SCFAs stimulated the expression of monocyte chemoattractant protein-1 (MCP-1) mRNA from 3T3-L1 preadipocytes and that concentrations of SCFAs
can reach elevated levels at sites of bacterial infection. A SCFA-induced inflammatory response from preadipocytes and other cells with immune function, such as fibroblasts, may provide a further contributing factor linking bacterial infection to the development of insulin resistance and the severity of inflammatory diseases such as atherosclerosis. (C) 2011 Elsevier Ltd. All rights reserved.”
“Opsin is the unstable apo-protein of the light-activated G protein-coupled receptor rhodopsin. We investigated the stability of bovine opsin, solubilized in 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC)/detergent bicelles, against urea-induced unfolding. A single irreversible protein unfolding transition was observed from changes in intrinsic tryptophan fluorescence and far-UV circular dichroism. This unfolding transition correlated with loss of protein activity. Changes in tertiary structure, as indicated by fluorescence measurements, were concomitant with an approximate 50% reduction in alpha-helical content of opsin, indicating that global unfolding had been induced by urea.
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