Single-cell RNA sequencing for the effects of Commd3 deficiency and celastrol treatment on humoral immune responses
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ABSTRACT: To profile the global effects of Commd3 deficiency on humoral immune responses, CD45+ cells from the draining lymph nodes (LNs) of CreERT2Commd3flox/+ and CreERT2Commd3flox/flox mice were subjected to single-cell RNA sequencing (scRNA-seq) at 7 days after immunization. We found that Commd3 deletion a week before immunization reduced only the proportion of germinal center B cells with minimal transcriptomic changes in B cell populations. Celastrol treatment in WT mice a week before immunization also selectively reduced the proportion of GC B cells with little impact on the transcriptomes, whereas none of the detectable immune cell populations were significantly affected by celastrol treatment in the immunized COMMD3C170A/C170A mice.
Project description:Purpose: The goals of this study was to (1) evaluate the protective effect of celastrol on alpha-naphthylisothiocyanate (ANIT)-induced cholestasis and (2) which genes were recovered by celastrol. Methods:To investigate the protective effect of celastrol on ANIT-induced cholestasis, the WT mice were randomly assigned into two groups, respectively (n=3): (1) ANIT; (2) ANIT+Celastrol. ANIT+Celastrol group was orally treated with celastrol (10 mg/kg dissolved in 1% DMSO + 2% Tween 80 + 97% water) for 5 consecutive days. After celastrol was treated for 3 days, ANIT and ANIT+Celastrol groups were given a single oral dose of ANIT. All mice were killed 48 h after ANIT administration. Liver samples were harvested and frozen at -80 °C before analysis. Results: A total of 978 DEGs were identified. Large numbers of these DEGs were related to activation of SIRT1, which included increased FXR signaling and inhibition of PPARγ, nuclear factor-kappa B (NF-κB), and P53 signaling. Conclusions: Celastrol could protect ANIT-induced cholestasis by recovering disrupted Sirt1 level.
Project description:Given that celastrol?s leptin-sensitizing effect requires high levels of circulating leptin, but lean mice have low levels of circulating leptin so that celastrol has no effect on lean mice. Analysis celastrol-induced hypothalamic gene expression profile change in lean mice will also be serving as negative control for DIO mice analysis.
Project description:Given that celastrol?s leptin-sensitizing effect requires both high levels of circulating leptin and intact leptin receptor signaling, we analyzed the effect of celastrol on hypothalamic gene expression profile of db/db mice, which have high circulating levels of leptin, but lack intact leptin receptor signaling. This analysis will be serving as negative control for DIO mice analysis.
Project description:Purpose: This study aimed to explore the mechanism of Celastrol in improving psoriasis through single-cell transcriptomics Methods: Supplementation with intragastric administration of celastrol in C57BL/6 mice to observe its effect on IMQ-induced psoriasis. Single-cell RNA sequencing were performed to explore the role of celastrol for IMQ-induced psoriasis. Results: A natural product library was used to screen for a small molecule compound, celastrol, that could interfere with fibroblast-macrophage communication. It was demonstrated that celastrol targeted low-denisity lipoprotein receptor-related protein 1 (LRP1) to inhibit fibroblast secretion of CCL2 and inhibited psoriasis progression by reducing its recruitment to macrophages, thereby blocking communication between the two cells Conclusion: We report that celastrol targeted low-denisity lipoprotein receptor-related protein 1 (LRP1) to inhibit fibroblast secretion of CCL2 and inhibited psoriasis progression by reducing its recruitment to macrophages. The use of celastrol maybe a noveltherapeuticoption for psoriasis.
Project description:Since leptin signaling in the hypothalamus is critical to regulate food intake and body weight, we investigated how celastrol alters the hypothalamic transcriptome of DIO mice. By doing this analysis, genes with potential relevance for celastrol-mediated leptin sensitization could be identified.
Project description:Obesity is characterized by central leptin resistance. Celastrol has been identified to reduce leptin resistance in diet-induced obese and leptin resistant mice. Current microarray data provide the hypothalamic gene expression profiles from mice treated with Celastrol or Withaferin A.
Project description:Celastrol is a natural product that affects LNCaP gene expression by 6h; We used microarrays to detail the global programme of gene expression affected by celastrol treatment at 6h Experiment Overall Design: LNCaP cells were grown to 50% confluency and treated with celastrol for 6h prior to direct Trizol lysis and RNA isolation
Project description:Celastrol has been shown to sensitize leptin receptor signaling and reduce ER stress. Current microarray data provide the gene expression profile in mouse embryonic fibroblasts (MEFs) after Celastrol treatment compared with control.
Project description:As a terpenoids natural product isolated from the plant Thunder God Vine, Celastrol is widely studied for its pharmacological activities, including anti-tumor activities. However, the clinical application of Celastrol is strictly limited due to its severe side effects. Without identification and validation of the target protein of Celastrol, it is difficult to determine whether its anti-tumor activities and side effects are due to inhibition of the same protein. Using a new computational tool we have developed for target discovery, peroxiredoxin I (PRDX1) was identified as the ROS-manipulating target protein of Celastrol. High-resolution crystal structure revealed the unique binding mode of Celastrol with PRDX1, via covalent reaction to the catalytic Cys-173 residue of PRDX1. New derivative compound named 19-048 with improved potency against PRDX1 and selectivity towards PRDX2~PRDX6 were synthesized. Both Celastrol and compound 19-048 effectively suppressed the proliferation of colorectal cancer cells. While these anti-tumor efficacy was significantly diminished on xenograft nude mice bearing PRDX1 knock-down colorectal cancer cells. Several downstream genes of p53 were dramatically up-regulated in the presence of Celastrol and compound 19-048. Our findings reveal that the side effects of Celastrol could be reduced via structural modification, and PRDX1 inhibition is promising for the treatment of colorectal cancer.
Project description:Celastrol plays a significant role in cerebral ischemia-reperfusion injury. Although previous studies have confirmed that celastrol post-treatment has a protective effect on ischemic stroke, the therapeutic effect of celastrol on ischemic stroke and the underlying molecular mechanism remain unclear. In the present study, focal transient cerebral ischemia was induced by transient middle cerebral artery occlusion (tMCAO) in mice and celastrol was administered immediately after reperfusion. We performed lncRNA and mRNA analysis in the ischemic hemisphere of adult mice with celastrol post-treatment through RNA-Sequencing (RNA-Seq). A total of 50 differentially expressed lncRNAs (DE lncRNAs) and 696 differentially expressed mRNAs (DE mRNAs) were identified between the sham and tMCAO group, and a total of 544 DE lncRNAs and 324 DE mRNAs were identified between the tMCAO and tMCAO+celastrol group. Bioinformatic analysis was done on the identified deregulated genes through gene ontology (GO) analysis, KEGG pathway analysis and network analysis. Pathway analysis indicated that inflammation-related signaling pathways played vital roles in the treatment of ischemic stroke by celastrol. Our study suggests celastrol treatment can effectively reduce cerebral ischemia-reperfusion injury. The bioinformatics analysis of lnRNAs and mRNAs profiles in the ischemic hemisphere of adult mice provides a new perspective in the neuroprotective effects of celastrol, particularly with regards to ischemic stroke.