Effect of serum amyloid A1 (SAA1) on gene expression in primary murine macrophages
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ABSTRACT:
PROVIDER: PRJNA649232 | ENA |
REPOSITORIES: ENA
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Project description:Macrophages are important regulators of the immune system and are critically involved in the pathophysiology of many diseases. Serum amlyoidosis is a protein misfolding disease which can follow chronic inflammatory conditions. Deposition of fibrils formed from serum amyloid A1 (SAA1) protein occurs systemically and can lead to severe or even fatal outcomes. Macrophages play a critical role in the misfolding and deposition of SAA1-derived fibrils and the role of macrophages in this context has been studied extensively. It is known that SAA1 can bind to some surface receptors on macrophages and it is taken up by the macrophages and metabolized in the lysosomes. On the other hand, the effect of SAA1 on macrophage physiology has been much less investigated so far. Therefore, we aim to investigate the effect of SAA1 on macrophage gene expression by gene microarray analysis. To this end, primary peritoneal macrophages from NMRI mice were treated with endotoxin-free recombinantly expressed full-length mSAA1 for 6 and 24 h and gene expression was analyzed.
2021-07-20 | GSE155278 | GEO
Project description:Metastasis is the key determinant of poor prognosis for advanced-stage NSCLC patients. Although an important contributor to metastasis is cross-talk between tumor-associated macrophages (TAMs) and tumor cells, its regulation is not fully understood. Expressed primarily in macrophages, scavenger receptor A1 (SR-A1) has been associated with lung tumorigenesis. Here, the mechanistic basis for the involvement of SR-A1 in lung cancer prognosis was investigated using population genetics, transcriptomics, and functional analyses. SR-A1 genetic variants were investigated for possible association with survival of advanced-stage NSCLC patients in the Harvard Lung Cancer Study cohort. Two SNPs (rs17484273, rs1484751) in SR-A1 were significantly associated with poor overall survival of NSCLC patients. Further, data from The Cancer Genome Atlas showed a considerable down-regulation of SR-A1 in lung tumor tissues. The association of SR-A1 with prognosis was validated in animal models in the context of lung cancer metastasis. Macrophages derived from SR-A1 knockout mice accelerated metastasis in a lung cancer mouse model. On the other hand, tumor cell seeding, migration, and invasion as well as macrophage accumulation in lung cancer tissue were enhanced in SR-A1 knockout mice. Furthermore, SR-A1 deficiency promoted up-regulation of serum amyloid A1 (SAA1) in macrophages, which appeared to be mediated by MAPK/Ikappa-B/NF-kappaB signaling. Further, SAA1 exposure promoted tumor cell invasion and macrophage migration in vitro and in vivo, but these effects were blocked by administration of an anti-SAA1 antibody. These findings suggest that SR-A1 may suppress lung cancer metastasis by down-regulating SAA1 production in macrophages.
2019-06-16 | GSE83473 | GEO
Project description:Human serum amyloid A (SAA) is a major acute phase protein and shows a massive increase of concentration in plasma during inflammation. In the current study, we report that recombinant human and mouse SAA1 (rhSAA1 and rmSAA1) have a potent antifungal activity against the major fungal pathogen Candida albicans. rhSAA1 binds to the cell surface of C. albicans and promotes cell aggregation. At high concentrations, rhSAA1 disrupts the membrane integrity and induces rapid cell death of C. albicans. Further investigation demonstrates that rhSAA1 targets on the cell wall adhesin Als3 of C. albicans. Inactivation of ALS3 in C. albicans leads to remarkably decreased cell aggregation and death upon rhSAA1 treatment, implying that Als3 plays a critical role in SAA1 sensing. Moreover, deletion of the ALS3 transcriptional regulators such as AHR1, BCR1, and EFG1 in C. albicans results in a similar effect on cell responses to that of the als3/als3 mutant upon rhSAA1 treatment. Global gene expression profiling analysis indicates that rhSAA1 has a remarkable impact on the expression of cell wall- and metabolism-related genes in C. albicans. Our finding of the antifungal activity of rhSAA1 against C. albicans expands the function of this protein and would provide new insights into the understanding of the host-Candida interaction during infections.
2019-09-01 | GSE128598 | GEO
Project description:Antifungal Activity of Mammalian Serum amyloid A1 against Candida albicans
| PRJNA528263 | ENA
Project description:Effect of HDL enriched with Serum Amyloid A1 (HDL+SAA1) on Gene Expression by Classical CD14+/CD16- Human Peripheral Blood Monocytes from Asthmatics
| PRJNA555747 | ENA
Project description:IL-6 and PTGS2 were the most highly expressed mRNA transcripts in Classical CD14+/CD16- Monocytes from Asthmatic Subjects in response to treatment with HDL+SAA1
2020-07-31 | GSE134591 | GEO
Project description:We report that the Serum Amyloid A protein, SAA1, is a novel, soluble co-factor able to promote pathogenic TH17 differentiation.
2019-12-05 | GSE132761 | GEO
Project description:This study attemps to study the global effects of Serum Amyloid A (SAA) on human endothelial gene expression profile in different time points. Keywords: time course
2006-11-09 | GSE6241 | GEO
Project description:W evaluated an experimental particle exposure model, including markers of the acute phase system assessed as the hepatic mRNA expression of Sap, the murine homologue of CRP, and Saa1 and Saa3. Keywords: Toxicology, disease state analysis, stress response, nanoparticles, air pollution
2009-04-27 | GSE11346 | GEO
Project description:Objectives: Systemic inflammation is a major risk factor for critical-illness myopathy (CIM) but its pathogenic role in muscle is uncertain. We observed that interleukin 6 (IL-6) and serum amyloid A1 (SAA1) expression was upregulated in muscle of critically ill patients. To test the relevance of these responses we assessed inflammation and acute-phase response at early and late time points in muscle of patients at risk for CIM. Design: Prospective observational clinical study and prospective animal trial. Setting: Two intensive care units (ICU) and research laboratory. Patients/Subjects: 33 patients with Sequential Organ Failure Assessment scores ≥8 on 3 consecutive days within 5 days in ICU were investigated. A subgroup analysis of 12 patients with, and 18 patients without CIM (non-CIM) was performed. Two consecutive biopsies from vastus lateralis were obtained at median days 5 and 15, early and late time points. Controls were 5 healthy subjects undergoing elective orthopedic surgery. A septic mouse model and cultured myoblasts were used for mechanistic analyses. Measurements and Main Results: Early SAA1 expression was significantly higher in skeletal muscle of CIM compared to non-CIM patients. Immunohistochemistry showed SAA1 accumulations in CIM patients at the early time point, which resolved later. SAA1 expression was induced by IL-6 and tumor necrosis factor-alpha in human and mouse myocytes in vitro. Inflammation-induced muscular SAA1 accumulation could be reproduced in a sepsis mouse model. Conclusions: Skeletal muscle contributes to general inflammation and acute-phase response in CIM patients. Muscular SAA1 could be important for CIM pathogenesis. Trial registration: ISRCTN77569430. Expression analysis of patients with and without CIM (non-CIM) was performed. Date were quantile normalized using Partek Genomic Suite 6.5, RMA background correction, pre background adjustment for GC content and data were limited to the full dataset
2014-05-06 | E-GEOD-53702 | biostudies-arrayexpress