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Gene expression of Wild Type and SR-A1-/- abdominal aortic tissues after CaPO4-envoked

ABSTRACT: Gene expression of Wild Type and SR-A1-/- abdominal aortic tissues after CaPO4-envoked

PROVIDER: PRJNA939569 | ENA |

REPOSITORIES: ENA

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Gene expression of Wild Type and SR-A1-/- abdominal aortic tissues after CaPO4-envoked

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RNA-sequencing of abdominal aortic aneurysm (AAA) and control abdominal aorta tissues

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Scavenger Receptor A1 Prevents Non-Small Cell Lung Cancer Metastasis by Suppressing Macrophage Serum Amyloid A1 Expression

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

Expression data from the abdominal aorta and abdominal aortic aneurysm

Project description:Global gene expression information that can be used to identify pathways involved in the pathophysiology of disease. We used microarrays to identify which genes are expressed in either the abdominal aorta (control) or in abdominal aortic aneurysms (case), and also which genes may be differential between the two tissue states. Keywords: Characterization of expression in both diseased and non-diseased abdominal aortas.

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Self-maintenance of Cardiac Resident Reparative Macrophages Attenuates Doxorubicin-induced Cardiomyopathy through the SR-A1-c-Myc Axis

Project description:Rationale: Doxorubicin-induced cardiomyopathy (DiCM) is a significant cause of heart failure and mortality in cancer patients, in which macrophage-orchestrated inflammation serves as an essential pathogenic mechanism. However, the specific roles of tissue-resident and monocyte-derived macrophages in DiCM remain poorly understood. Objective: Uncovering the origins, phenotypes, and functions of proliferative cardiac resident macrophages and mechanistic insights into the self-maintenance of cardiac macrophage during DiCM progression. Methods and Results: Mice were administrated with doxorubicin to induce cardiomyopathy. Dynamic changes of resident and monocyte-derived macrophages were examined by lineage tracing, parabiosis, and bone marrow transplantation. We found that the monocyte-derived macrophages primarily exhibited a pro-inflammatory phenotype that dominated the whole DiCM pathological process and impaired cardiac function. In contrast, cardiac resident macrophages were vulnerable to doxorubicin insult. The survived resident macrophages exhibited enhanced proliferation and conferred a reparative role. Global or myeloid specifically ablation of class A1 scavenger receptor (SR-A1) inhibited proliferation of cardiac resident reparative macrophages and therefore exacerbated cardiomyopathy in DiCM mice. Importantly, the detrimental effect of macrophage SR-A1 deficiency was confirmed by transplantation of GFP+ wild type bone marrow. At the mechanistic level, we show that c-Myc, a key transcriptional factor for the SR-A1-P38-SIRT1 pathway, mediated the effect of SR-A1 in reparative macrophage proliferation in DiCM. Conclusions: The SR-A1-c-Myc axis may represent a promising target to treat DiCM through augmentation of cardiac resident reparative macrophage proliferation.

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