Transcription profiling of mouse macrophages infected with Leishmania amazogensis amastigotes
Ontology highlight
ABSTRACT:
ORGANISM(S): Mus musculus
DISEASE(S): normal
SUBMITTER: Eric Prina
PROVIDER: E-MEXP-1595 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
Publications
Transcriptional signatures of BALB/c mouse macrophages housing multiplying Leishmania amazonensis amastigotes.
Osorio y Fortéa José J de La Llave Emilie E Regnault Béatrice B Coppée Jean-Yves JY Milon Geneviève G Lang Thierry T Prina Eric E
BMC genomics 20090320
<h4>Background</h4>Mammal macrophages (MPhi) display a wide range of functions which contribute to surveying and maintaining tissue integrity. One such function is phagocytosis, a process known to be subverted by parasites like Leishmania (L). Indeed, the intracellular development of L. amazonensis amastigote relies on the biogenesis and dynamic remodelling of a phagolysosome, termed the parasitophorous vacuole, primarily within dermal MPhi.<h4>Results</h4>Using BALB/c mouse bone marrow-derived ...[more]
Similar Datasets
Project description:In mammals, resident dermal macrophages (MΦs) are subverted by Leishmania (L.) amazonensis amastigotes as host cells permissive for parasite multiplication. These Leishmania are living within a communal parasitophorous vacuole (PV) and are expected to trigger unique MΦ transcriptional signatures. We performed a transcription profiling of mouse MΦs harboring amastigotes to get insights into their reprogramming as host cells for parasite multiplication. BALB/c mouse bone marrow-derived MΦs were either loaded or not with four amastigotes on average. Twenty four hours later, when amastigotes multiply, total RNA from MΦ cultures was prepared, amplified and hybridized onto Affymetrix Mouse430_2 GeneChips®. The outcome recorded a total of 1,248 probe-sets showing significant differential expression. Comparable fold-change values for a handful of genes were obtained between Affymetrix technology and the more sensitive RTqPCR method. Ingenuity Pathway Analysis software® pinpointed the up-regulation of the sterol biosynthesis pathway (P-value = 1.31e-02) involving several genes (1.95 to 4.30 fold-change values), and the modulation of various genes involved in polyamine synthesis and in pro/counter-inflammatory signaling. Our findings suggest that amastigotes exploit the MΦ lipid and polyamine pathways to multiply efficiently, and induce a counter-inflammatory environment to expand their dermis niche. Experiment Overall Design: Mice, MΦs and amastigotes: Experiment Overall Design: Swiss nu/nu and BALB/c mice were used (following National Scientific Ethics Committee guidelines) for L. amazonensis (LV79 strain, MPRO/BR/1972/M1841) amastigote propagation and to prepare bone marrow-derived MΦs, respectively. Amastigotes were added at a multiplicity of 4 amastigotes per MΦ. Parasite-harboring MΦs (>98%; samples I1, I2 and I3) and parasite-free ones (samples UI1, UI2 and UI3) were cultured at 34°C (LV79 permissive temperature) for 24h. Experiment Overall Design: Real-time quantitative PCR: Experiment Overall Design: Total RNA from various biological samples including those used for hybridization experiments were reverse transcribed into cDNA using random hexamers (Roche Diagnostics) and Moloney Murine Leukemia Virus Reverse Transcriptase (Invitrogen Life Technologies). RTqPCR was performed using LightCycler-480 system (Roche) with primers designed with LightCycler Probe Design 1.0 software.Target genes primer sequences, amplicon melting temperatures and amplification efficiencies are available upon request. Gene expression analysis using qBase program allowed determining the normalized relative quantities between parasite-free and parasite-harboring MΦs.
2009-01-14 | E-GEOD-11497 | biostudies-arrayexpress
Project description:We used Illumina sequencing of poly-A selected RNA of Leishmania mexicana (WHO strain MNYC/BZ/62/M379) culture-adapted promastigotes (PRO), axenic amastigotes (AXA) and intracellular amastigotes (AMA) in mouse bone marrow derived macrophages (BMDM), 24h after infection, to map 5' and 3' ends of Leishmania transcripts and determine transcript abundances. The AMA samples were prepared from total RNA of infected macrophages thus containing a mixture of leishmanial and murine RNA transcripts. We also sequenced poly-A selected RNA from uninfected BMDMs. Three biological replicates per sample.
2015-09-11 | E-MTAB-3312 | biostudies-arrayexpress
Project description:This study was designed to investigate the Metformin mode of action in different subtypes of breast cancer using cell and molecular, and systems biology techniques. To that end, several concentrations of Metformin have been used. Besides, five different breast cancer cell lines representing the five breast cancer phenotypes have been employed in this study. These cell lines were BT-474, MCF-7, MDA-MB-231, MDA-MB-468, and SkBr3 as representative for (Luminal B, Luminal A, Claudin-low, Basal-like, and HER2) subtypes respectively. Interestingly, Metformin treatment significantly reduced cancer cell viability and proliferation while inducing cell apoptosis and enhanced cell necrosis of the Basal-like (MDA-MB-468), although, the less sensitive subtype is HER2 (SkBr3).
2019-03-07 | E-MTAB-7737 | biostudies-arrayexpress
Project description:Abstract Protozoa of the genus Leishmania are the causative agents of leishmaniasis in humans. These parasites cycle between promastigotes in the sand fly mid-gut and amastigotes in phagolysosome of mammalian macrophages. During infection, they up-regulate host nitric oxide synthase and arginase expression, both of which use arginine as a substrate. These elevated activities deplete macrophage arginine pools, a situation that invading Leishmania must overcome since it is an essential amino acid. Leishmania donovani imports exogenous arginine via a mono-specific amino acid transporter (AAP3) and utilizes it primarily through the polyamine pathway to provide precursors for trypanothione biosynthesis. Here we report the discovery of a pathway whereby promastigote and amastigote forms of the Leishmania sense the lack of environmental arginine and respond with rapid up-regulation in AAP3 expression and activity, as well as several other transporters. Significantly, this arginine deprivation response is also activated in parasites during macrophage infection. Phosphoproteomic analyses of L. donovani promastigotes have implicated a mitogen activated protein kinase 2 (MPK2)-mediated signaling cascade in this response and L. mexicana mutants lacking MPK2 are unable to respond to arginine deprivation. In addition, these mutants cannot differentiate into amastigotes in axenic culture or in peritoneal macrophages, and fail to establish an infection in mice. We propose that sensing arginine levels plays a critical role in Leishmania virulence by activating a rapid metabolic reaction for salvaging this amino acid in response to the lower arginine concentration in the macrophage phagolysosome.
2016-02-17 | PXD002766 | Pride
Project description:Abstract Protozoa of the genus Leishmania are the causative agents of leishmaniasis in humans. These parasites cycle between promastigotes in the sand fly mid-gut and amastigotes in phagolysosome of mammalian macrophages. During infection, they up-regulate host nitric oxide synthase and arginase expression, both of which use arginine as a substrate. These elevated activities deplete macrophage arginine pools, a situation that invading Leishmania must overcome since it is an essential amino acid. Leishmania donovani imports exogenous arginine via a mono-specific amino acid transporter (AAP3) and utilizes it primarily through the polyamine pathway to provide precursors for trypanothione biosynthesis. Here we report the discovery of a pathway whereby promastigote and amastigote forms of the Leishmania sense the lack of environmental arginine and respond with rapid up-regulation in AAP3 expression and activity, as well as several other transporters. Significantly, this arginine deprivation response is also activated in parasites during macrophage infection. Phosphoproteomic analyses of L. donovani promastigotes have implicated a mitogen activated protein kinase 2 (MPK2)-mediated signaling cascade in this response and L. mexicana mutants lacking MPK2 are unable to respond to arginine deprivation. In addition, these mutants cannot differentiate into amastigotes in axenic culture or in peritoneal macrophages, and fail to establish an infection in mice. We propose that sensing arginine levels plays a critical role in Leishmania virulence by activating a rapid metabolic reaction for salvaging this amino acid in response to the lower arginine concentration in the macrophage phagolysosome.
2016-04-11 | PXD002830 | Pride
Project description:To identify target genes of miR-142-5p and miR-130a-3p that are involved in M2 polarization, we examined the mRNA expression profile changes after altering miR-142-5p or miR-130a-3p expression in IL-4-treated macrophages. Macrophages were transfected with control ASO, miR-142-5p ASO, control mimics or miR-130-3p mimics using lentiviral vectors. After 24 hr, the cells were treated with IL-4 for 24h.mRNA was purified from total RNA after removal of rRNA (mRNA-ONLY™ Eukaryotic mRNA Isolation Kit, Epicentre). Then, each sample was amplified and transcribed into fluorescent cRNA along the entire length of the transcripts without 3’ bias utilizing a random priming method. The labeled cRNAs were hybridized onto the Human RNA Array v2.0 (8 x 60K, Arraystar). After having washed the slides, the arrays were scanned by the Agilent Scanner G2505B.
2014-07-12 | E-GEOD-59347 | biostudies-arrayexpress
Project description:Among the most central questions in Leishmania research is why some species remain in the skin dermis at the site of infection by the sand fly vector whereas other species migrate to visceral organs where they cause fatal visceral leishmaniasis. Although L. donovani is the species typically responsible for visceral leishmaniasis, an atypical L. donovani strain is the etiologic agent for cutaneous leishmaniasis in Sri Lanka. To identify molecular determinants for visceral disease, we have analysed the phenotype and genotype of two L. donovani clinical isolates from Sri Lanka where one isolate was derived from a cutaneous leishmaniasis patient (CL) and the other from a visceral leishmaniasis patient (VL). These isolates cause dramatically different pathology when introduced into mice; notably the CL isolate has lost the ability to survive in visceral organs while the VL isolate was highly virulent in visceral organs of BALB/c mice. Whole genome sequencing of the CL and VL isolates revealed that these genomes were very similar as there were no gene deletions and few individual gene amplifications. Indels resulting in frame shifts and loss/gain of stop codons resulted in 13 distinct pseudogenes present in each of the CL and VL isolates. There were 154 non-synonymous SNPs specific to the CL isolate and 193 non-synonymous SNPs specific to the VL isolate. Genome wide gene expression analysis revealed several transcript level differences, including the A2 virulence gene resulting in higher expression of A2 proteins in the VL isolate than in the CL isolate. Genotypic variations relevant to pathology and tropism in Leishmania can be interrogated by reverse genetics. Experimentally increasing A2 expression in the CL isolate through gene transfer significantly increased itM-bM-^@M-^Ys ability to survive in the spleen of BALB/c mice and conversely, down-regulating A2 expression in the VL isolate abrogated attenuated its survival in BALB/c mice. These observations reveal that there are relatively few genetic differences between the CL and VL isolates apart from the A2 genes, but collectively these have profound effects on human disease and experimentally infected mice. 6 Samples in total, 3 each from VL and CL causing isolates were analyzed by Splice Leader RNASeq. These three samples from each of the isolates were grown to form one of the following three lifestages, Promastigotes, Macrophage derived Amastigotes, Axenic Amastigotes.
2013-12-31 | E-GEOD-48475 | biostudies-arrayexpress
Project description:Mammalian motor circuits control voluntary movements by transmitting signals from the central nervous system (CNS) to muscle targets. To form these circuits, motor neurons (MNs) must extend their axons out of the CNS. Although motor axon exit from the CNS is an indispensable phase of motor axon pathfinding, the underlying molecular mechanisms remain obscure. Here, we present the first identification of a genetic pathway that regulates motor axon exit from the vertebrate spinal cord, utilizing spinal accessory motor neurons (SACMN) as a model system. SACMN are a homogeneous population of spinal MNs whose axons leave the CNS through a discrete lateral exit point (LEP) and can be visualized by the expression of the cell surface protein, BEN. We show that the homeodomain transcription factor, Nkx2.9, is selectively required for SACMN axon exit and identify the Robo2 guidance receptor as a likely downstream effector of Nkx2.9; loss of Nkx2.9 leads to a reduction in Robo2 mRNA and protein within SACMN and SACMN axons fail to exit the spinal cord in Robo2-deficient mice. Consistent with short-range interactions between Robo2 and Slit ligands regulating SACMN axon exit, Robo2-expressing SACMN axons normally navigate through LEP-associated Slits as they emerge from the spinal cord, and fail to exit in Slit-deficient mice. Our studies support the view that Nkx2.9 controls SACMN axon exit from the mammalian spinal cord by regulating Robo-Slit signaling. We utilized microarray technology to identify novel downstream effectors of the homeodomain transcription factor, Nkx2.9, that regulate spinal accessory motor neuron development.
2013-06-15 | E-GEOD-47953 | biostudies-arrayexpress
Project description:Col-0 and WEE1KO (wee1-1 and wee1-2) were germinated on control medium on a nylon mesh and transferred 5 days after germination to control medium. Samples were harvested at three different time points after transfer: 0 h, 5 h, and 24 h. All sampling points were performed in four independent experiments for Col-0, two independent experiments for wee1-1 and two independent experiments for wee1-2. For each time point in each experiment ﾱ50 root tips were collected and frozen in liquid nitrogen. RNA was extracted from root tissue with TriZol reagent (Invitrogen) and purified with RNneasy kit (Qiagen). The RNA of two independent experiments for Col-0 and WEE1KO were subsequently pooled and used for microarray analysis.
2011-07-24 | E-MEXP-3048 | biostudies-arrayexpress
Project description:Col-0 and WEE1KO (wee1-1 and wee1-2) were germinated on control medium on a nylon mesh and transferred 5 days after germination to medium supplemented with 2 mM HU. Samples were harvested at three different time points after transfer: 0 h, 5 h, and 24 h. All sampling points were performed in four independent experiments for Col-0, two independent experiments for wee1-1 and 2 independent experiments for wee1-2. For each time point in each experiment ﾱ50 root tips were collected and frozen in liquid nitrogen. RNA was extracted from root tissue with TriZol reagent (Invitrogen) and purified with RNneasy kit (Qiagen). The RNA of two independent experiments for Col-0 and WEE1KO were subsequently pooled and used for<br>microarray analysis.
2011-07-24 | E-MEXP-3053 | biostudies-arrayexpress