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Comparative analysis of gene expression in response to LL-37 treatment

ABSTRACT: To identify the potential LL-37-responsed genes, we treated cells with or without LL-37 and their correspondent transcriptional profiles were compared. Total 104 significant genes were identified. Among them, 70 genes are upregulated in repsonse to LL-37 while 34 genes are downregulated in comparison with the control cells. LL-37 responsed gene was measured after 3 h growth in YPD followed by 30 min of incubation in the presence of 5 ug/ml LL-37 in RPMI. Two batches of five independent experiments were performed.

ORGANISM(S): Candida albicans

SUBMITTER: Pei-Wen Tsai

PROVIDER: E-GEOD-45177 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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The human cathelicidin antimicrobial peptide LL-37 promotes the growth of the pulmonary pathogen Aspergillus fumigatus.

Project description:Aspergillus fumigatus contributes to invasive and allergic pulmonary disease in immunocompromised individuals. The pulmonary mucus of cystic fibrosis (CF) patients displays elevated levels of the pleiotropic cathelicidin antimicrobial peptide LL-37 and the aim of this work was to assess the effect of LL-37 on the growth A. fumigatus. Exposure of A. fumigatus conidia to high concentrations of intact LL-37 (100 μg/ml) for 24 hours had a positive effect on growth (277.45 ± 22.59% (p < 0.01)) whereas scrambled LL-37 (76.45 ± 7.46%) did not. Exposure of 24 hour pre-formed mycelium to 5 μg/ml LL-37 for 48 hours increased hyphal wet weight significantly (4.37 ± 0.23 g, p < 0.001) compared to the control (2.67 ± 0.05 g). Amino acid leakage from mycelium was observed in the presence of LL-37 and gliotoxin secretion was increased at 24 hours from LL-37 exposed hyphae (169.1 ± 6.36 ng/mg hyphae, p < 0.05) compared to the control (102 ± 18.81 ng/mg hyphae). Quantitative proteomic analysis of 24 hour LL-37 treated hyphae revealed an increase in the abundance of proteins associated with growth (eIF-5A (16.3 fold increased), tissue degradation (aspartic endopeptidase (4.7 fold increased)) and allergic reactions (Asp F13 (10 fold increased)). By 48 hours there was an increase in proteins indicative of cellular stress (glutathione peroxidase (9 fold increased)), growth (eIF-5A (6 fold increased), and virulence (ribonuclease mitogillin (3.7 fold increased). These results indicate that LL-37 stimulates A. fumigatus growth and this may result in increased fungal growth and secretion of toxins in the lungs of CF patients.

2018-05-22 | PXD008143 | Pride

Proteomic adaptation of Streptococcus pneumoniae to the human antimicrobial peptide LL-37

Project description:Secreted antimicrobial peptides (AMPs) are an important part of the human innate immune system and prevent local and systemic infections by inhibiting bacterial growth in a concentration dependent manner. In the respiratory tract, the cationic peptide LL-37 is one of the most abundant AMPs and capable of building pore complexes in usually negatively charged bacterial membranes, leading to destruction of bacteria. However, adaptation mechanisms of several pathogens to LL-37 are already described and are known to weaken the antimicrobial effect of the AMP, for instance, by repulsion, export or degradation of the peptide. This study examines proteome wide changes in Streptococcus pneumoniae D39, the leading cause of bacterial pneumonia, in response to physiological concentrations of LL-37 by high resolution mass spectrometry. Our data indicate that pneumococci may use some of the known adaptation mechanisms to reduce the effect of LL-37 on their physiology, too. Additionally, several proteins seem to be involved in resistance to AMPs which have not been related to this process before, such as the teichoic acid flippase TacF (SPD_1128). Understanding colonization and infection relevant adaptations of the pneumococcus to AMPs, especially LL-37, could finally uncover new drug targets to weaken the burden of this widespread pathogen.

2020-03-19 | PXD016511 | Pride

RNA sequencing analysis of abdominal adipose tissue in 7 week old juvenile broiler chickens divergently selected for abdominal fatness or leanness

Project description:Chickens divergently selected for either high abdominal fat content (fat genotype) or low abdominal fat content (lean genotype) at Station Recherches Avicoles, Institut National de la Recherche Agronomique Nouzilly, France were used to profile abdominal fat gene expression at 7 weeks of age. The fat line (FL) and lean line (LL) chickens differ in various phenotypic and metabolic measurements, including abdominal fatness, plasma glycemia and triiodothyronine (T3). The FL and LL chickens represent unique models for characterizing biomedical and agricultural traits. Massively parallel RNA sequencing (RNA-Seq) was completed on an Illumina HiSeq 2000 System for transcription analysis of FL and LL abdominal fat. Statistical analysis was completed using CLC Genomics Workbench software. A total of 1,703 genes were differentially expressed in the FL versus LL adipose tissue [FDR<0.05 and fold change (FL/LL) > 1.2]. The differentially expressed genes include metabolic enzymes, acute phase proteins, growth factors, coagulation factors, immune factors, vasoregulators and transcription factors involved in various pathways. Several of the functional genes identified are also positional candidate genes within quantitative trait loci (QTL) in an F2 population created from an intercross of the FL and LL lines. Keywords: Divergently selected chickens, fatness, transcriptional profiling, differentially expressed genes Abdominal fat mRNA profiles of fat line (FL) and lean line (LL) chickens at 7 weeks of age were generated by deep sequencing (on an Illumina HiSeq 2000 system) employing several sequencing schemes to determine depth of coverage from 1, 4, and 8 multiplexed libraries per sequencing lane. Transcriptional analysis was completed by averaging short paired-end sequence reads (101 bp) for each bird across three sequencing depths.

2013-04-16 | E-GEOD-42980 | biostudies-arrayexpress

Transcriptional response of Pseudomonas aeruginosa PAO1 to human host defense peptide LL-37

Project description:In this experiment the transcriptional response of the opportunistic human pathogen Pseudomonas aeruginosa towards physiological concentrations of the major human host defense peptide LL-37 was investigated using microarrays. To this aim, three independent cultures of P. aeruginosa PAO1 were grown until mid-log phase in Mueller-Hinton broth and subsequently incubated with either sublethal LL-37 concencentrations (20 M-5g/ml) or without peptide for 2 h at 37 M-0C following RNA extraction and microarray analysis.

2013-12-20 | E-MEXP-3970 | biostudies-arrayexpress

protein phosphorylation landscape in photosystem I of the desert algae Chlorella sp

Project description:The regulation of photosynthesis in response to varying light conditions is primarily controlled through the phosphorylation of thylakoid proteins. This process is most extensively studied in the context of the phosphorylation of photosystem II (PSII) and light-harvesting complex II (LHCII) subunits. However, there is comparatively less understanding of the changes induced by light stress in photosystem I and light-harvesting complex I (LHCI). In this study, we examined the alterations in protein phosphorylation of PSI-LHCI in Chlorella ohadii, an extremely light-tolerant desert green alga, when grown under low light (LL) and high light (HL) conditions.

2024-03-17 | PXD049080 | Pride

Light effect on the hormonal and transcriptional status of winter and spring wheat plants during cold hardening

Project description:The effect of light during the development of freezing tolerance was studied in winter wheat (Triticum aestivum L. var. Mv Emese) and spring wheat variety Nadro. Ten-day-old plants were cold hardened at 5°C for 12 days either under normal (250 mmol m-2 s-1) or low light (20 mmol m-2 s-1) conditions. Samples of Emese (E) and Nadro (N) plants grown at 18°C under normal (NL) and low (LL) light fluences were compared to each other in a simple loop design and E-NL vs. E-LL; N-NL vs. N-LL; E-NL vs. NLL and E-LL vs. N-LL comparisons were made.

2012-01-31 | E-GEOD-29640 | biostudies-arrayexpress

Gill Transcriptomic Responses to Toxin-producing Alga Prymnesium parvum in Rainbow Trout

Project description:Prymnesium parvum is regarded as one of the most notorious harmful algal bloom (HAB) species worldwide. In recent years, it has frequently formed toxic blooms in coastal and brackish waters of America, Europe, Australia, Africa and Asia, causing large-scale mortalities of wild and cultured fish and other gill-breathing animals. In the last decade, blooms of P. parvum have expanded to inland fresh waters in the USA, presumably due to changes in environmental conditions. The aim of the experiment was to establish the gill transcriptomic responses to P. parvum in rainbow trout. We used 2 different concentrations of P. parvum and identified fish with low and moderate responses to the algae. Based on the dose of and the fish response, fish were classified into 4 groups with high exposure/moderate response (HM), high exposure/low response (HL), low exposure/low response (LL) and control group (C) with no exposure/no response. Gene expression profiling of the gill tissue was performed using a microarray platform developed and validated for rainbow trout.

2021-11-10 | E-MTAB-10541 | biostudies-arrayexpress

Transcriptional profiling of THP-1 cells on treatment with LL-37 and nano conjugated LL-37

Project description:Gene expression in THP-1 cells treated for 6 hours with CNT and GNP conjugated with LL-37, LL-37 spiked as well as free LL-37: Reference (Total RNA Mixture of all samples) vs. treated cells

2017-06-17 | GSE98630 | GEO

Comparative analysis of gene expression in response to LL-37 treatment

Project description:To identify the potential LL-37-responsed genes, we treated cells with or without LL-37 and their correspondent transcriptional profiles were compared. Total 104 significant genes were identified. Among them, 70 genes are upregulated in repsonse to LL-37 while 34 genes are downregulated in comparison with the control cells.

2016-03-11 | GSE45177 | GEO

Effect of long-term vitamin D supplementation on colonic gene expression in IL-10 Knockout mice at young adulthood

Project description:Low vitamin D status has been implicated in the progression of inflammatory bowel disease (IBD). This study used interleukin (IL)-10 knockout (KO) mice, that develop an intestinal inflammation when housed in a non-sterile environment, to determine if supplementation with vitamin D throughout life impacts colonic gene expression. Results provide important information on the intestinal response to vitamin D in inflamed mice. Female IL-10 knock out mice were randomized to 25 (Low, L) or 5000 (High, H) IU vitamin D/kg of diet throughout pregnancy and lactation. At weaning, offspring received the same or opposite diet as their mother until age 3 months. This resulted in four vitamin D interventions: HH, HL, LH, or LL where the first letter represents the diet consumed by dams during pregnancy and lactation and the second letter represents the diet consumed by offspring from weaning through to 3 months of age. Global gene expression was analyzed in the proximal colon of 3 months old mice (n=6 per group, for a total of 24 samples; samples came from different litters and moms IDs are given in the samples table below). Samples were stored at -80C.

2015-01-02 | E-GEOD-61111 | biostudies-arrayexpress

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