CD36 Triggers a non-classical lipid metabolic Program promoting Immune Escape and Resistance to HMA therapy in AML
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ABSTRACT:
PROVIDER: PRJNA935375 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR23489700_1.fastq.gz | Fastqsanger.gz | |||
| SRR23489700_2.fastq.gz | Fastqsanger.gz | |||
| SRR23489701_1.fastq.gz | Fastqsanger.gz | |||
| SRR23489701_2.fastq.gz | Fastqsanger.gz | |||
| SRR23489702_1.fastq.gz | Fastqsanger.gz |
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Project description:Monocytes can be classified into four different subsets: classic, intermediate and SLAN- and SLAN+ non-classical monocytes. SLAN+ monocytes are significantly reduced in MM patients compare to the frequency found in healthy adults (HA). Thus, we sought to analyze the transcriptome of SLAN- and SLAN+ cells to unveil the differences among both populations We used microarrays to detail the global programme of gene expression underlying the differences among both cell subsets We developed a 12-color combination of mAbs to evaluate the contribution of each individual marker for identifying and subsetting BM TAMs in patients with MM (N = 5): CD36-UV405, CD16-UV525, CD163-BV450, CD45-BV525, CD206-BV610, CD86-BV660, CD62L-BV763, cyCD68-FITC, SLAN-PE, HLADR-PerCPCy5.5, CD300e-APC, CD14-APCH7. This panel allowed us to identify the aforementioned four monocyte subsets. Intermediate and non-classical monocytes from healthy donors were FACS sorted based on the 7-color mAb combination - HLADR-PacB, CD45-OC515, CD36-FITC, SLAN-PE, CD16-PECy7, CD300e-APC, CD14APCH7 -
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Project description:Monocytes and macrophages as components of innate immunity are critical for both homeostasis and inflammation. The scavenger receptor CD36, highly expressed in macrophages, promotes immunological responses mediated by recognition of molecular patterns on pathogens or endogenous ligands on apoptotic cells. CD36 mediated lipid uptake also allows metabolic adaptations that influence macrophage phenotype and polarization. CD36 binds diverse lipids including fatty acids and various lipoproteins, which could exert differential effects on macrophage conversion. Previous studies reported opposite outcomes due to CD36-mediated lipid uptake; macrophages converted to either an inflammatory or an alternatively activated phenotype. To determine the role of this receptor in vivo in the presence of physiological lipid sources, we created macrophage-specific CD36 knockout mice. Using zymosan-induced peritonitis to activate immune cells, we show through single cell RNA sequencing analysis that a broad variety of resident and infiltrated immune cells are present in the peritoneum 72h after the initial stimulus. CD36 deficiency did not affect the numbers of cells during the infiltration and resolution phases, but CD36 deficiency altered the macrophage transcriptome. Pathways related to innate immunity, antigen presentation and oxidative phosphorylation were upregulated in macrophages with CD36 deficiency, whereas those related to efferocytosis, adaptive immunity and B cell activation were downregulated. Despite these gene changes, neither immunoglobulin production nor peritoneal efferocytosis was altered by macrophage CD36 deficiency, nor were there changes in the numbers of circulating white blood cells. Thus, CD36 deficiency does not reduce the inflammatory phenotype of induced peritoneal macrophages.
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Project description:Hypoxia is a hallmark of renal ischemia reperfusion injury (IRI) and serves as an essential regulator of innate immune responses during this process, although the mechanisms of this regulation remain unclear. Here, we show that dendritic cell (DC)-specific genetic ablation of hypoxia-inducible factor (HIF) 2α, a transcription factor induced by oxygen shortage, leads to hyperactivation of natural killer T cells (NKTs), ultimately exacerbating renal IRI in mice. HIF-2α deficiency in DCs triggers IFN-γ and IL-4 production in NKTs, along with upregulation of type I interferon (IFN) and chemokine responses critical for NKT activation. Mechanistically, loss of HIF-2α in DCs promotes their expression of CD36, a scavenger receptor for lipid uptake, resulting in increased lipid accumulation. Furthermore, HIF-2α binds directly to a reverse hypoxia-responsive element (rHRE) in the CD36 promoter, supporting its transcriptional regulation of CD36. Importantly, CD36 blockade by sulfo-N-succinimidyl oleate (SSO), reduces NKT activation and abolishes the exacerbation of renal IRI in mice with DC-specific HIF-2α knockout. Taken together, our study reveals a previously unrecognized role of a HIF-2α-CD36 regulatory axis in rewiring DC lipid metabolism under IRI-associated hypoxia, and suggests a potential therapeutic target to resolve long-standing obstacles in clinical treatment of this severe complication.
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Project description:BACKGROUND & AIMS: The scavenger receptor CD36 has versatile immuno-metabolic actions. CD36 is abundantly expressed in the small intestinal epithelium but its impact on gut homeostasis is unknown. METHODS: Wild type (WT) and CD36-null (CD36KO) mice were fed a chow diet and small intestinal morphology assessed by immunohistochemistry and electron microscopy (EM). Inflammation was evaluated from neutrophil infiltration, expression of cytokines and toll-like receptors. Barrier integrity was determined using FITC-dextran and circulating lipopolysaccharide (LPS). Enterocyte (Ent-CD36KO) and endothelial (EC-CD36KO) CD36 null mice were generated to test contribution of epithelial versus endothelial CD36 to the intestinal phenotype. RESULTS: The small intestine of CD36KO mice fed a chow diet showed abnormal remodeling of the extracellular matrix (ECM) with altered expression of ECM and junction proteins. Hypertrophy of cell junctions and basement membranes was observed by EM. The CD36KO intestines displayed neutrophil infiltration, inflammation and compromised barrier function. Systemic leukocytosis and neutrophilia were present in CD36KO mice and there was 80% reduction of anti-inflammatory Ly6Clow monocytes important for ECM regulation and tissue repair. Bone marrow transplants supported primary contribution of tissue injury in initiation of inflammation. Studies with Ent-CD36KO mice did not support a major contribution of enterocyte CD36 while endothelial CD36 deficiency associated with neutrophil infiltration, aberrant expression of tight junctions and inflammation in the small intestine. CONCLUSION: CD36 is important for maintenance of barrier function in the small intestine. CD36 deletion causes ECM remodeling with collagen accumulation, depletion of the Ly6Clow monocyte subset and chronic inflammation. Endothelial but not enterocyte CD36 loss is a significant contributor to the spontaneous inflammation.
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