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Mettl3-mediated mRNA m6A methylation promotes dendritic cell activation

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Mus musculus

PROVIDER: GSE108333 | GEO | 2019/04/02

REPOSITORIES: GEO

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Mettl3-mediated mRNA m<sup>6</sup>A methylation promotes dendritic cell activation.

Project description:N6-methyladenosine (m6A) modification plays important roles in various cellular responses by regulating mRNA biology. However, how m6A modification is involved in innate immunity via affecting the translation of immune transcripts remains to be further investigated. Here we report that RNA methyltransferase Mettl3-mediated mRNA m6A methylation promotes dendritic cell (DC) activation and function. Specific depletion of Mettl3 in DC resulted in impaired phenotypic and functional maturation of DC, with decreased expression of co-stimulatory molecules CD40, CD80 and cytokine IL-12, and reduced ability to stimulate T cell responses both in vitro and in vivo. Mechanistically, Mettl3-mediated m6A of CD40, CD80 and TLR4 signaling adaptor Tirap transcripts enhanced their translation in DC for stimulating T cell activation, and strengthening TLR4/NF-κB signaling-induced cytokine production. Our findings identify a new role for Mettl3-mediated m6A modification in increasing translation of certain immune transcripts for physiological promotion of DC activation and DC-based T cell response.

| S-EPMC6478715 | biostudies-literature

Mettl3-mediated mRNA m6A methylation promotes dendritic cell activation

Project description:Mettl3-mediated mRNA m6A methylation promotes dendritic cell activation

| PRJNA423184 | ENA

METTL3 mediated m6A mRNA methylation regulates neutrophil activation through targeting TLR4 signaling

Project description:This SuperSeries is composed of the SubSeries listed below.

2023-03-31 | GSE225143 | GEO

METTL3-mediated m6A modification of KIF3C-mRNA promotes prostate cancer progression and is negatively regulated by miR-320d.

Project description:The occurrence of distant metastasis is one of the leading causes of death in patients with prostate cancer (PCa). It is confirmed that kinesin protein is associated with a variety of malignancies, and the KIF3 family is related to cancer, but the relationship between KIF3C and prostate cancer is not clear. Our experiments have confirmed that KIF3C is highly expressed in prostate cancer tissues and cell lines. Further, functional tests have proven that KIF3C can promote the growth migration and invasion of PCa. We used Starbase 3.0 to discover that methyltransferase like 3 (METTL3) interacts with KIF3C. Our hypothesis and experiments concluded that METTL3 induced m6A modification on KIF3C, promoting the stabilization of KIF3C-mRNA by IGF2 binding protein 1 (IGF2BP1). The prediction that miR-320d inhibits KIF3C expression by targeting METTL3 using the miRmap website, was later confirmed experimentally. Further, a recovery experiment was used to confirm that miR-320d inhibited the progression of prostate cancer. KIF3C was overexpressed in prostate cancer, promoting its growth migration and invasion was induced by miR-320d/METTL3 in an m6A dependent process.

| S-EPMC8507285 | biostudies-literature

METTL3-mediated m6A methylation of ASPM drives hepatocellular carcinoma cells growth and metastasis.

Project description:BackgroundAbnormal spindle-like microcephaly (ASPM) has been proved to participate in tumor progression. However, the underlying mechanism of ASPM in liver hepatocellular carcinoma (LIHC) remains elusive.MethodsThe mRNA and protein expression were determined using Western blot and qRT-PCR, and the capacities of cells proliferation, migration, and invasion were evaluated by CCK-8, colony formation, wound healing, and transwell. MeRIP was performed to validate the interaction between ASPM and methyltransferase-like 3 (METTL3).ResultsHerein, we found that ASPM was significantly upregulated in LIHC, and the high expression of ASPM was associated with poor LIHC prognosis. Furthermore, ASPM knockdown could suppress LIHC cells proliferation, migration, and invasion, while ASPM overexpression exerted reverse effect. Mechanistically, we revealed that the N6-methyladenosine (m6A) modification of ASPM mRNA mediated by METTL3 promoted its expression in LIHC. More importantly, silencing METTL3 suppressed LIHC cells proliferation, migration, and invasion, which could be retained by ASPM overexpression.ConclusionCollectively, our findings suggested that METTL3/ASPM axis could serve as a novel promising therapeutic candidate for LIHC.

| S-EPMC8418466 | biostudies-literature

Alternative splicing of METTL3 explains apparently METTL3-independent m6A modifications in mRNA.

Project description:N6-methyladenosine (m6A) is a highly prevalent mRNA modification that promotes degradation of transcripts encoding proteins that have roles in cell development, differentiation, and other pathways. METTL3 is the major methyltransferase that catalyzes the formation of m6A in mRNA. As 30% to 80% of m6A can remain in mRNA after METTL3 depletion by CRISPR/Cas9-based methods, other enzymes are thought to catalyze a sizable fraction of m6A. Here, we reexamined the source of m6A in the mRNA transcriptome. We characterized mouse embryonic stem cell lines that continue to have m6A in their mRNA after Mettl3 knockout. We show that these cells express alternatively spliced Mettl3 transcript isoforms that bypass the CRISPR/Cas9 mutations and produce functionally active methyltransferases. We similarly show that other reported METTL3 knockout cell lines express altered METTL3 proteins. We find that gene dependency datasets show that most cell lines fail to proliferate after METTL3 deletion, suggesting that reported METTL3 knockout cell lines express altered METTL3 proteins rather than have full knockout. Finally, we reassessed METTL3's role in synthesizing m6A using an exon 4 deletion of Mettl3 and found that METTL3 is responsible for >95% of m6A in mRNA. Overall, these studies suggest that METTL3 is responsible for the vast majority of m6A in the transcriptome, and that remaining m6A in putative METTL3 knockout cell lines is due to the expression of altered but functional METTL3 isoforms.

| S-EPMC9295969 | biostudies-literature

Stage-specific requirement for Mettl3-dependent m6A mRNA methylation during hematopoietic stem cell differentiation

Project description:This SuperSeries is composed of the SubSeries listed below.

2019-03-31 | GSE123527 | GEO

METTL3 mediated m6A mRNA methylation regulates neutrophil activation through targeting TLR4 signaling (Ribosome-Seq)

Project description:To investigate the effect of METTL3 function in the regulation of neutrophil activation, we established neutrophil METTL3 knock out mice by crossing METTL3flox/flox mice with Lyzm-cre mice. We then performed gene expression profiling analysis using data obtained from Ribosome-seq of isolated neutrophil from METTL3f/f and METTL3f/f Lyzm-Cre mice .

2023-03-31 | GSE225140 | GEO

METTL3 mediated m6A mRNA methylation regulates neutrophil activation through targeting TLR4 signaling (RNA-Seq)

Project description:To investigate the effect of METTL3 function in the regulation of neutrophil activation, we established neutrophil METTL3 knock out mice by crossing METTL3flox/flox mice with Lyzm-cre mice. We then performed gene expression profiling analysis using data obtained from RNA-seq of isolated neutrophil from METTL3f/f and METTL3f/f Lyzm-Cre mice with or without intraperitoneal injection of lipopolysaccharide (LPS) treatment.

2023-03-31 | GSE225141 | GEO

METTL3 mediated m6A mRNA methylation regulates neutrophil activation through targeting TLR4 signaling (meRIP-Seq)

Project description:To investigate the effect of METTL3 function in the regulation of neutrophil activation, we established neutrophil METTL3 knock out mice by crossing METTL3flox/flox mice with Lyzm-cre mice. We then performed gene expression profiling analysis using data obtained from MeRIP-seq of isolated neutrophil from METTL3f/f and METTL3f/f Lyzm-Cre mice .

2023-03-31 | GSE225139 | GEO

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