Project description:Mammalian injury responses are characterized by fibrosis and scarring rather than functional regeneration. Limited regenerative capacity in mammals could reflect a loss of pro-regeneration programs or active suppression by genes functioning akin to tumor suppressors. To uncover programs governing regeneration in mammals, we performed comprehensive transcript screening in human subjects after laser rejuvenation treatment and cross-referenced these transcripts to those found in mice with enhanced Wound Induced Hair Neogenesis (WIHN), a rare example of mammalian organogenesis1,2. We find the anti-viral endoribonuclease RNase L to be a powerful suppressor of regeneration. Rnasel-/- mice exhibit remarkable regenerative capacity, with elevated WIHN through enhanced IL-36α. Consistent with the known role of RNase L to stimulate caspase-1, we find that pharmacologic inhibition of caspases promotes regeneration in a novel IL-36-dependent manner. Additionally, these responses are not limited to skin but extend to other organs, such as the colon, suggesting that suppression of regeneration is a fundamental characteristic of epithelial wound healing. Taken together, this work suggests that RNase L functions as a regeneration repressor gene in a functional tradeoff that prioritizes host antiviral abilities and is a target to enhance healing in multiple epithelial organs, perhaps even during viral infection.
Project description:Human primary keratinocytes were collected at 0, 1, 3, 6, 12, 24 and 48 hours after addition of 1.8mM Calcium and RNA was extracted. Primary normal human keratinocytes (NHEK) were collected and RNA was extracted 0, 1, 3, 6, 12, 24, and 48 after addition of 1.8mM Calcium.
Project description:All samples were gathered from mouse RAW 264.7 cells (macrophages). Control total RNA was extracted from untreated RAW 264.7 cells cultured for 48 hours. Test total RNA was extracted from lipopolysaccharide (100ng/ml) and lipopolysaccharide-binding protein (100pM) treated RAW 264.4 cells cultured for 48 hours. Experiment design included three control vs test arrays and three dye swap arrays. Keywords: other
Project description:To further develop our gene expression study, we have employed the microrarray expression to study the regulate gene expression on breast cancer cells after 48 hours of treatments