Coiling in the distal part of the ophthalmic artery, over the branching of the main MK-2206 mouse ciliary artery, caused more severe retinal ischemia.
Multifocal electroretinography recordings, which reflect retinal function in an area close to the visual streak, showed decreased amplitudes and increased implicit times after distal occlusion, but not after proximal occlusion of the ophthalmic artery. The responses were similar 1 hour and 72 hours after coiling, indicating that a permanent ischemic injury was established.\n\nCONCLUSIONS. The porcine ophthalmic artery can be occluded using an endovascular coiling technique. This provides an experimental animal model of retinal ischemia in which occlusion at different sites of the vasculature produces different degrees of severity
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“Antimicrobial peptides are important effectors of innate immunity throughout the plant and animal kingdoms. In the mammalian small intestine, Paneth cell alpha-defensins are antimicrobial peptides that contribute to host defense against enteric pathogens. To determine if alpha-defensins also govern intestinal microbial ecology, we analyzed the intestinal microbiota of mice expressing a human alpha-defensin gene (DEFA5) and in mice lacking an enzyme required for the processing of mouse alpha-defensins. In these complementary models, we detected significant alpha-defensin-dependent changes in microbiota composition, but not in total bacterial numbers. Furthermore, DEFA5-expressing mice had striking losses of segmented filamentous bacteria and fewer interleukin 17 (IL-17)-producing lamina propria T cells. Our data ascribe a new homeostatic role to alpha-defensins in regulating the makeup of the commensal microbiota.”
“Epigenetic
changes occur frequently in Wilms’ tumor (WT), especially loss of imprinting (LOI) of 1GF2/H19 at 11p15. Our previous results have identified imprinted transcripts (123 WT1-AS and AWT1) from the WT1 locus at 11p13 and showed LOI of these in some WTs. In this article, we set out to test the relationship between LOI at 11 p13 and 11 p15 and their timing in WT progression relative to other genetic changes. Liver X Receptor inhibitor We found a higher level (83%) of 11 p13 LOI in WT than of 11 p15 LOI (71%). There was no correlation between methylation levels at the 11 p13 and 11 p15 differentially methylated regions or between allelic expression of WT1-AS/AWT1 and IGF2. Interestingly, retention of normal imprinting at 11p13 was associated with a small group of relatively late-onset, high-stage WTs. An examination of genetic and epigenetic alterations in nephrogenic rests, which are premalignant WT precursors, showed that LOI at both 11 p13 and 11 p15 occurred before either 16q loss of heterozygosity (LOH) or 7p LOH.