Effect of the oxidized phospholipids PGPC and POVPC on gene expression in RAW 264.7 macrophages
Ontology highlight
ABSTRACT:
INSTRUMENT(S): GenePix 4000B scanner
ORGANISM(S): Mus musculus
SUBMITTER: Daniel Koller
PROVIDER: E-MTAB-2781 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
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2015-10-26 | E-GEOD-72633 | biostudies-arrayexpress
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2010-12-30 | GSE26295 | GEO
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2011-07-19 | E-GEOD-30169 | biostudies-arrayexpress
Project description:Human SZ95 sebocytes were transfected by lipofection with either scramble siRNA or OLR1 siRNA and after 24h were treated with 25µg/ml of UV-oxidized 1-palmitoyl-2-arachidonoyl-sn-phosphocholine (UVPAPC) for 7 hours. Phospholipid oxidation products (OxPL) are versatile stress signaling mediators in the skin. These lipid signaling molecules can be generated non-enzymatically or enzymatically by ultraviolet light, the major extrinsic skin aging factor. OxPL regulate cytoprotective, immunological and metabolic adaptation of the skin to oxidant stress. We here investigated whether the scavenger receptor Oxidized Low Density Lipoprotein Receptor 1 (OLR1, LOX-1) would have a function in cutaneous oxPL signaling. We found that OLR1 is expressed in several cutaneous cell types, most prominently in cells of the sebaceous gland and in keratinocytes. We repressed OLR1 expression with siRNA in SZ95 sebocytes, exposed cells to oxidized 1-palmitoyl-2-arachidonoyl-sn-phosphatiylcholine (PAPC) and performed transcriptomic profiling. Bioinformatic analysis revealed that OxPL exposure induced the Nrf2 antioxidant stress response and aldosterone signaling. The analysis also revealed that OLR1 is not required for the transcriptional regulation induced by oxidized PAPC, but interestingly, OLR1 knockdown affected expression of CNN2, HMRR, ITGB6 and KIF20A, all genes governing cell proliferation and motility. We identify sebocytes as cutaneous cells responsive to lipid mediated redox stress which is not dependent on the scavenger receptor OLR1.
2020-04-15 | GSE98335 | GEO
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2018-10-31 | MSV000083086 | MassIVE
Project description:The immune deficiency (IMD) pathway directs host defense in arthropods upon bacterial infection. In Pancrustacea, peptidoglycan recognition proteins sense microbial moieties and initiate nuclear factor-κB-driven immune responses. Proteins that elicit the IMD pathway in non-insect arthropods remain elusive. Here, we show that an <i>Ixodes scapularis</i> homolog of croquemort (Crq), a CD36-like protein, promotes activation of the tick IMD pathway. Crq exhibits plasma membrane localization and binds the lipid agonist 1-palmitoyl-2-oleoyl-<i>sn</i>-glycero-3-phosphoglycerol. Crq regulates the IMD and jun N-terminal kinase signaling cascades and limits the acquisition of the Lyme disease spirochete <i>B. burgdorferi</i>. Additionally, nymphs silenced for <i>crq</i> display impaired feeding and delayed molting to adulthood due to a deficiency in ecdysteroid synthesis. Collectively, we establish a distinct mechanism for arthropod immunity outside of insects and crustaceans.
2023-04-27 | MTBLS686 | MetaboLights
Project description:Background: Regulatory T cells (Tregs) are protective in atherosclerosis but reduced during disease progression due to cell death and loss of stability. However, the mechanisms of Treg dysfunction remain unknown. Oxidized phospholipids (oxPLs) are abundant in atherosclerosis and can activate innate immune cells, but little is known regarding their impact on T cells. Given Treg loss during atherosclerosis progression and oxPL levels in the plaque microenvironment, we investigated whether oxidized 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphocholine (oxPAPC), an oxPL associated with atherosclerotic plaques, alters Treg differentiation and function. Methods: CD4+ T cells were polarized to Treg, Th1, and Th17 cells with or without oxPAPC and assessed by flow cytometry. Gene expression in oxPAPC-treated Tregs was analyzed by bulk RNA sequencing. Functional studies of oxPAPC-induced Tregs were performed by co-culturing Tregs with CTV-labeled cells in vitro, and by adoptively transferring Tregs to hyperlipidemic Ldlr-/- mice to measure atherosclerosis progression. Results: Compared to controls, oxPAPC-treated Tregs were less viable, but surviving cells expressed higher levels of the Th1-associated markers T-bet, CXCR3, and IFN-. Th1 and Th17 skewing cultures were unaltered by oxPAPC. IFN- is linked to Treg instability, thus Treg polarization experiments were repeated using Ifngr1-/- CD4+ T cells. IFNR1 deficiency did not improve cell viability in oxPAPC-treated Tregs, however, T-bet and IFN- expression was not increased in surviving cells suggesting a role for IFN-signaling. OxPAPC-treated Tregs were less suppressive in vitro, and adoptive transfer studies in hyperlipidemic Ldlr-/- mice showed that oxPAPC-induced Tregs possessed altered tissue homing and were insufficient to inhibit atherosclerosis progression. Conclusions: OxPAPC elicits Treg-specific changes altering Treg differentiation and inducing a Th1-like phenotype in surviving cells partially through IFN- signaling. This is biologically relevant as oxPAPC-treated Tregs do not reduce atherosclerosis progression in Ldlr-/- mice. This study supports the role for oxPLs in negatively impacting Treg differentiation and atheroprotective function.
2023-07-04 | GSE236226 | GEO