Innate immune function of galectin-1 as a DAMP
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ABSTRACT:
PROVIDER: PRJNA591290 | ENA |
REPOSITORIES: ENA
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Project description:Galectin-1 is a prototype member of the galectin family of b-galactoside-binding proteins with several immunoregulatory activities (Sundblad et al., 2017). Although this lectin exerts extracellular activities by cross-linking cell surface glycoconjugates, the mechanisms and molecular machinery involved in its secretion are uncertain as it lacks the classical signal sequence required for ER-Golgi release (Camby, 2006; Croci et al., 2014). To assess the global impact of galectin-1 on LPS-induced transcriptomic response, we performed RNAseq analysis of total RNAs from the spleen and the lungs of wild-type and Lgals1-/- mice injected with LPS.
2020-10-29 | GSE140892 | GEO
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2018-09-21 | GSE120269 | GEO
Project description:Disruption of skin homeostasis by environmental insults activates pathologic circuitries leading to inflammation and carcinogenesis. Galectin-7 (Gal-7), a lectin preferentially expressed in keratinocytes, has been implicated in wound healing and defective skin repair. Here we report using genetically-engineered mouse models and human samples, essential roles for Gal-7 during skin carcinogenesis via coordinated intracellular and extracellular mechanisms. Heightened Gal-7 expression delineated malignant lesions in non-melanoma skin cancer (NMSC) patients and shaped the course of skin carcinogenesis in mice. Intracellularly, increased Gal-7 conferred genomic instability to skin lesions and favored transcription of inflammation-related genes reprogramming the immune landscape toward a myeloid immunoregulatory profile. Extracellularly, Gal-7 accelerated skin carcinogenesis through glycan-dependent induction of monocytic myeloid-derived suppressor cells with enhanced immune regulatory activity. Our findings identify a lectin-driven molecular circuitry that promotes skin carcinogenesis by coupling genomic instability, transcriptional regulation and myeloid immunosuppressive programs, suggesting a potential therapeutic target for the treatment of NMSC.
2023-01-13 | GSE165285 | GEO
Project description:The ability to perform complex bioassays in parallel enables experiments otherwise impossible due to throughput and cost constraints. By way of example, highly parallel chemical-genetic screens using pooled collections of thousands of defined Saccharomyces cerevisiae gene deletion strains are feasible because each strain is barcoded with unique DNA sequences. It is, however, time consuming and expensive to individually barcode individual strains. To provide a simple and general method of barcoding yeast collections, we built a set of donor strains, called Barcoders, with unique barcodes that can be systematically transferred to any S. cerevisiae collection. We applied this technology by generating a collection of barcoded DAmP (Decreased Abundance by mRNA Perturbation) loss-of-function strains comprising 87.1% of all essential yeast genes. This test collection validates both the Barcoders and the DAmP collection as useful tools for genome-wide chemical genetic assays.
2008-07-03 | E-MEXP-1671 | biostudies-arrayexpress
Project description:The goal of this study was to examine differences in gene expression of tumor specific CD8 T cells in an in vivo tumor mouse model after inhibition of galectin-3 protein expression by genetic knockout. Galectin-3 is thought to modulate CD8 T cell response by cross-linking cell surface glycoproteins Galectin-3 is a 31 kD carbohydrate-binding lectin that is over-expressed by many human malignancies. It also modulates T cell responses through a diverse array of mechanisms including induction of apoptosis, TCR cross linking in CD8+ T cells, and T cell receptor (TCR) down regulation in CD4+ T cells. We found that patients responding to a granulocyte-macrophage colony-stimulating factor (GM-CSF) secreting allogeneic pancreatic tumor vaccine developed post immunization antibody responses to galectin-3 on a proteomic screen. We used the HER-2/neu (neu-N) transgenic mouse model to study galectin-3 binding on adoptively transferred high avidity neu-specific CD8+ T cells derived from TCR transgenic mice. Here, we show that galectin-3 binds preferentially to activated antigen-committed CD8+ T cells only in the tumor microenvironment (TME). Galectin-3 deficient mice exhibit improved CD8+ T cell effector function and increased expression of several inflammatory genes when compared with wild type (WT) mice. We also show that galectin-3 binds to LAG-3, and LAG-3 expression is necessary for galectin-3 mediated suppression of CD8+ T cells in vitro. Lastly, galectin-3 deficient mice have significantly elevated levels of circulating plasmacytoid dendritic cells (pDCs), which are superior to conventional dendritic cells (cDCs) in activating CD8+ T cells. Binding of galectin-3 to cell-surface glycoproteins on immune cells suppresses a pro-inflammatory immune response. Thus, inhibiting galectin-3 in conjunction with CD8+ T cell directed immunotherapies should enhance the tumor specific immune response. 3 different experimental groups were studied. Galectin-3 WT CD8 T cells adoptively transferred into Galectin-3 WT mice, galectin-3 WT CD8 T cells transferred into galectin-3 KO mice, and finally galectin-3 KO CD8 T cells transferred into galectin-3 KO mice. Galectin-3 WT CD8 T cells transferred into Galectin-3 WT mice were used as the reference group. Four biological replicates were submitted for each group, and adoptively transfered CD8 T cells were isolated 5 days post-adoptive transfer into tumor-bearing mice treated with a whole cell GM-CSF secreting vaccine. Cells were purified by cell sorting on the Thy1.2 surface marker.
2015-02-19 | E-GEOD-59454 | biostudies-arrayexpress
Project description:Linking Indirect Effects of Cytomegalovirus to Modulation of Monocyte Innate Immune Function
| PRJNA545723 | ENA
Project description:The goal of this study was to examine differences in gene expression of tumor specific CD8 T cells in an in vivo tumor mouse model after inhibition of galectin-3 protein expression by genetic knockout. Galectin-3 is thought to modulate CD8 T cell response by cross-linking cell surface glycoproteins Galectin-3 is a 31 kD carbohydrate-binding lectin that is over-expressed by many human malignancies. It also modulates T cell responses through a diverse array of mechanisms including induction of apoptosis, TCR cross linking in CD8+ T cells, and T cell receptor (TCR) down regulation in CD4+ T cells. We found that patients responding to a granulocyte-macrophage colony-stimulating factor (GM-CSF) secreting allogeneic pancreatic tumor vaccine developed post immunization antibody responses to galectin-3 on a proteomic screen. We used the HER-2/neu (neu-N) transgenic mouse model to study galectin-3 binding on adoptively transferred high avidity neu-specific CD8+ T cells derived from TCR transgenic mice. Here, we show that galectin-3 binds preferentially to activated antigen-committed CD8+ T cells only in the tumor microenvironment (TME). Galectin-3 deficient mice exhibit improved CD8+ T cell effector function and increased expression of several inflammatory genes when compared with wild type (WT) mice. We also show that galectin-3 binds to LAG-3, and LAG-3 expression is necessary for galectin-3 mediated suppression of CD8+ T cells in vitro. Lastly, galectin-3 deficient mice have significantly elevated levels of circulating plasmacytoid dendritic cells (pDCs), which are superior to conventional dendritic cells (cDCs) in activating CD8+ T cells. Binding of galectin-3 to cell-surface glycoproteins on immune cells suppresses a pro-inflammatory immune response. Thus, inhibiting galectin-3 in conjunction with CD8+ T cell directed immunotherapies should enhance the tumor specific immune response.
2015-02-19 | GSE59454 | GEO
Project description:Natural killer (NK) cells are leukocytes of the innate immune system and play a central role in the control of cancer metastases. NK cells and other innate immune cells often do not function well in patients with cancer and are also profoundly suppressed after cancer surgery. Dr. Auer’s Lab and others have shown that NK cells are critically important in the clearance of tumor metastases and that their impairment can be recovered with immune therapy augmenting the innate immune system. Several studies suggest that cancer patients have depressed NK cell cytotoxicity as compared to healthy controls but that following resection of the cancer, NK cell cytotoxicity returns to normal levels. In this observational study, the investigators will measure NK cell cytotoxicity by the gold standard method (51Cr, a chromium51 release assay) and by a new interferon-ɣ (IFN-ɣ) based assay (NK-Vue) in healthy humans and colorectal cancer (CRC) surgery patients seen a The Ottawa Hospital. The results of this study will determine if the NK-Vue is able to discriminate between healthy human volunteers and newly diagnosed cancer patients and is sufficiently sensitive to detect transient NK cell suppression immediately following surgery.
| 2265023 | ecrin-mdr-crc
Project description:Vascular Innate immune cells, such as macrophages, elicit long-term T cell-, and B cell- immune responses, by expressing danger-associated molecular pattern (DAMP) receptors, T cell co-stimulation receptors and presenting antigens to the adaptive system through major histocompatibility complex (MHC)-II. Here, we investigated whether human aortic endothelial cells (HAECs) could also be “transdifferentiated” into innate immune cells after treatment of hyperlipidemia-upregulated DAMP molecules, lysophosphatidylinositol (LPI). HAECs were treated with vehicle control or lysophosphatidylinositol (16:0) (10µM) for 18 hours.
2018-05-16 | E-MTAB-6605 | biostudies-arrayexpress