Similar Datasets
Project description:Regulation of Dermal Fibroblasts by Human Neutrophil Peptides
| PRJNA962108 | ENA
Project description:Interleukin-1 (IL-1) is produced from immune-activated cells upon infection and tissue injury, and stimulates a variety of cells expressing its receptor. IL-1 receptor activation results in intracellular signaling cascades that culminate in the activation of transcription factors such as NF-kappaB, AP-1, and C/EBPbeta. To identify genes whose expression is induced in response to IL-1, we performed DNA microarray analysis of IL-1-treated murine dermal fibroblasts (DFs). The gene expression patterns in control, untreated DFs and in DFs treated with IL-1 were compared. Keywords: Time course
2009-01-01 | GSE12285 | GEO
Project description:Originally simply reported to be in a stable and irreversible growth arrest in vitro, senescent cells are now clearly associated with normal and pathological ageing in vivo. They are characterized by several biomarkers and changes in gene expression that may depend on epigenetic factors, such as histone acetylation, involving a balance between histone acetyltransferases (HATs) and histone deacetylases (HDACs). In this study, we investigate the expression and the role of HDACs on the senescent phenotype of dermal fibroblasts. We report that during replicative senescence, most canonical HDACs are less expressed. Moreover, treatment with SAHA, a histone deacetylase inhibitor (HDACi) also known as Vorinostat, or the specific downregulation of HDAC2 or HDAC7 by siRNA, induces the appearance of senescence biomarkers of dermal fibroblasts. Conversely, the ectopic re-expression of HDAC7 by lentiviral transduction in pre-senescent dermal fibroblasts extends their proliferative lifespan. These results demonstrate that HDACs expression can modulate the senescent phenotype, highlighting their pharmaceutical interest in the context of healthy ageing.
| S-EPMC8351730 | biostudies-literature
Project description:The skin provides an essential barrier for host defense through rapid action of multiple resident and recruited cell types, but the complex communication network governing these processes is incompletely understood. To define these cell-cell interactions more clearly, we performed an unbiased network analysis of mouse skin during invasive S. aureus infection and revealed a dominant role for CXCL12+ fibroblast subsets in neutrophil communication. These subsets predominantly reside in the reticular dermis, express adipocyte lineage markers, detect IL-17 and TNFα, and promote robust neutrophil recruitment through NFKBIZ-dependent release of CXCR2 ligands and CXCL12. Targeted deletion of Il17ra in mouse fibroblasts resulted in greatly reduced neutrophil recruitment and increased infection by S. aureus. Analogous human CXCL12+ fibroblast subsets abundantly express neutrophil chemotactic factors in psoriatic skin that are subsequently decreased upon therapeutic targeting of IL-17. These findings show that CXCL12+ dermal immune acting fibroblast subsets play a critical role in cutaneous neutrophil recruitment and host defense.
| S-EPMC10890925 | biostudies-literature
Project description:AIM:To clarify the fractional activity of promoters from human alpha1(I) procollagen gene, the interaction between cis-elements and consensus DNA-binding proteins responsible for high promoter activity, and the potential application of promoter competitors as well as cytokines for antifibrogenesis. METHODS:Sequence between 2483 bp upstream of the start of transcription and 42 bp downstream of this site was investigated with serial 5'-deletion. The 5'-deleted promoters recombined with chloramphenicol acetyltransferase (CAT) as reporter gene were transiently transfected to human dermal fibroblasts. Electrophoretic mobility shift assay was performed to show the DNA-protein binding capacity of the promoter sequence. Cytokines including tumor necrosis factor alpha (TNFalpha) and interferons (INFs) were added to the culture medium of transiently transfected fibroblasts. Competitor DNA for the binding sites of Sp-1, Ap-1 and NF-1 was individually cotransfected transiently in order to block the promoter-driven CAT expression. RESULTS:Sequences of -2483 to +42 bp and -268 to +42 bp of human alpha1(I) procollagen gene had high activity as promoters. Binding sites for Ap-1 and Sp-1 were among the cis-regulatory elements recognizing consensus transcription factors responsible for basal promoter activity of sequence -268 to +42 bp. TNFalpha, IFNalpha, IFNbeta showed inhibitory effects on sequence -2 483 to +42 bp as promoter with activities 43%, 62% and 60% of control respectively. Transfection of the promoter competitors could reverse the promoter activity of -268 to +42 bp 40-60%. CONCLUSION:Sequences of -2 483 to +42 bp recombined with reporter gene provide an ideal construction for transcriptional study of alpha1(I) procollagen gene. The anti-collagen capacity of TNFalpha and IFNs is associated with their transcriptional regulation. Ap-1 and Sp-1 mediate the basal transcriptional activation of human alpha1(I) procollagen gene in dermal fibroblasts. Competitors for highly active promoters might be a novel potential candidate in fibrotic blockade.
| S-EPMC4656282 | biostudies-literature
Project description:Collagen is the major structural protein in the extracellular matrix of skin produced by fibroblasts. UV exposure results in infiltration of neutrophils within the epidermis and dermis, inducing collagen damage and contributing to the process of photo-aging. Collagen-3 is an integral structural component with collagen-1, and is an important regulator of collagen-1 fibrillogenesis. Addition of neutrophils activated with TNFα to normal human dermal fibroblast cultures, but not their supernatant, caused significant collagen-3 damage. To study whether Lumenato can protect from collagen-3 damage, it was added to co-cultures of Normal human dermal fibroblasts and neutrophils activated with TNFα. Lumenato prevented collagen-3 damage induced by activated neutrophils in a dose-dependent manner in the co-cultures. Lumenato also induced a low rate of collagen-3 synthesis in a dose-dependent manner detected by pro-collagen-3 secretion, but did not affect fibroblast cell number. Although Lumenato inhibited MMP-8, MMP-9, and elastase secreted from neutrophils, its main effect was in inhibiting both NADPH oxidase-producing superoxides and MPO activity-producing halides in a dose-dependent manner that correlated with protection from collagen-3 damage. In conclusion, the results suggest that Lumenato induces low levels of collagen-3 that may contribute for skin health and is very effective in defending the co-cultures from collagen-3 damage by inhibiting free radicals secreted from neutrophils, thus, indicating Lumenato's possible potential for skin protection.
| S-EPMC7968672 | biostudies-literature
Project description:We investigated the mechanisms by which protein kinase C (PKC) regulates the expression of the alpha2(I) collagen gene in normal dermal fibroblasts. Reduction of PKC-alpha activity by treatment with Gö697-6 or by overexpression of a dominant negative (DN) mutant form decreased alpha2(I) collagen gene expression. This decrease required a sequence element in the collagen promoter that contains Sp1/Sp3 binding sites. Reduction of PKC-delta activity by rottlerin or overexpression of DN PKC-delta also decreased alpha2(I) collagen gene expression. This effect required a separate sequence element containing Sp1/Sp3-binding sites and an Ets-binding site. In both cases, point mutations within the response elements abrogated the response to PKC inhibition. Forced overexpression of Sp1 rescued the PKC inhibitor-mediated reduction in collagen protein expression. A DNA affinity precipitation assay revealed that inhibition of PKC-delta by rottlerin increased the binding activity of endogenous Fli1 and decreased that of Ets1. On the other hand, TGF-beta1, which increased the expression of PKC-delta, had the opposite effect, increasing the binding activity of Ets1 and decreasing that of Fli1. Our results suggest that PKC-delta is involved in the regulation of the alpha2(I) collagen gene in the presence or absence of TGF-beta. Alteration of the balance of Ets1 and Fli1 may be a novel mechanism regulating alpha2(I) collagen expression.
| S-EPMC552962 | biostudies-literature
Project description:We report the responsiveness of bovine dermal fibroblasts to lipopolyssacharide (LPS) within individuals at different ages. Cultures were collected from three different heifers at the ages of approximately 5 and 16 months. Isolated fibroblasts were then exposed to LPS to determine whether there was a differential response within an animal based upon age. Fibroblasts were isolated from 3 cows at the ages 5 months and 16 months. Isolated fibroblasts were treated with LPS for 0 hrs, 2 hrs, and 8 hrs.
2014-12-23 | E-GEOD-61027 | biostudies-arrayexpress
Project description:Interleukin-1 (IL-1) is produced from immune-activated cells upon infection and tissue injury, and stimulates a variety of cells expressing its receptor. IL-1 receptor activation results in intracellular signaling cascades that culminate in the activation of transcription factors such as NF-kappaB, AP-1, and C/EBPbeta. To identify genes whose expression is induced in response to IL-1, we performed DNA microarray analysis of IL-1-treated murine dermal fibroblasts (DFs). The gene expression patterns in control, untreated DFs and in DFs treated with IL-1 were compared. Experiment Overall Design: Total RNAs from untreated DFs (0 h) vs. IL-1-treated DFs (1 h, 2 h, or 4 h after IL-1 treatment) were isolated and analyzed using an Agilent DNA microarray platform. Hybridization was performed in duplicate for dye swapping.
2009-01-14 | E-GEOD-12285 | biostudies-arrayexpress
Project description:Significant occupational and environmental exposures to hexavalent chromium, a metal with broad toxicity potential in humans, have been reported. In order to understand the mechanisms of dermal toxicity induced by hexavalent chromium, global gene expression profiling of human dermal fibroblasts exposed to a toxic concentration of potassium dichromate was performed. Microarray analysis of the gene expression profile in the fibroblasts treated with potassium dichromate identified significant differential expression of approximately 1,200 transcripts compared with the control cells. Hierarchical cluster analysis of the gene expression profile demonstrated a clear separation of the treated cells from the control group of cells. Functional categorization of the differentially expressed genes identified the enrichment of genes involved in several cellular processes, including apoptosis and oxidative stress, in the fibroblasts exposed to hexavalent chromium. Induction of apoptosis and generation of hydroxyl radicals indicative of oxidative stress in the dermal fibroblasts in response to their exposure to hexavalent chromium were independently confirmed by TUNEL assay and electron spin resonance (ESR) analysis, respectively. The potassium dichromate-induced cytotoxicity, differential gene expression, apoptosis, and oxidative stress were significantly blocked by the addition of ferrous sulfate, an agent known for its ability to reduce hexavalent chromium to the insoluble and therefore impermeable trivalent form, to the cell culture medium. Taken together, our data provide insights into the potential mechanisms underlying the dermal toxicity of hexavalent chromium and suggest a definite role for apoptosis and oxidative stress in Cr(VI)-induced cytotoxicity in human dermal fibroblasts.
2011-07-31 | GSE16349 | GEO