Influence of substrate stiffness on barrier function in an iPSC-derived in vitro blood-brain barrier model
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ABSTRACT:
PROVIDER: PRJEB44183 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| ERR5684210_1.fastq.gz | Fastqsanger.gz | |||
| ERR5684210_2.fastq.gz | Fastqsanger.gz | |||
| ERR5684211_1.fastq.gz | Fastqsanger.gz | |||
| ERR5684211_2.fastq.gz | Fastqsanger.gz | |||
| ERR5684203_1.fastq.gz | Fastqsanger.gz |
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Project description:The substrate stiffness plays an important role in mediating the cellular behavior. Neutrophils predominate the early inflammatory response and initiate the regeneration. The neutrophil activation can be regulated by physical cues. However, it is not known how neutrophils respond to substrate stiffness, which is of significant importance in determining the outcomes of engineered tissue mimics. Herein, a three-dimensional culture system made of hydrogel for bone marrow-derived neutrophils was developed to explore the effects of varying stiffness (1.5, 2.6, and 5.7 kPa) on neutrophil phenotype and polarization states.
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Project description:Purpose: Identify the effect of substrate stiffness on gene expression Methods:Evaluating for differentially expressed mRNAs in the SKOV-3 cells grown on the different substrates via High-throughput sequence Results: We found that the general direction of changes in gene expression of cells grown on the different substrates and the most significant signalling pathways and the expression of gene orthologs broadly involved in platinum drug resistance, apoptosis, cell cycle. Conclusions: Our study represents the first detailed analysis of the effects of substrate stiffness on gene expression of ovarian cancer cells.
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Project description:Mechanical feedback from the tumor microenvironment regulates an array of processes underlying cancer biology. Routine culture and adaptation of cancer cell lines to unnaturally rigid plastic or glass substrates leads to profound changes in their growth, metastatic potential and potentially chemotherapeutic response. Microarray studies were conducted to probe the impact of substratum stiffness on the regulation of genetic pathways in mammary tumor cells, and immortalized cancer cell lines, that modulate sensitivity and resistance towards clinically-approved chemotherapeutics We used microarrays to detail the global programme of gene expression underlying cellular response to substrates of different mechanical stiffness.
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Project description:Elevated intraocular pressure, a major risk factor of glaucoma, is caused by the abnormal function of trabecular outflow pathways. Human trabecular meshwork (HTM) tissue plays an important role in the outflow pathways. However, the molecular mechanisms that how TM cells respond to the elevated IOP are largely unknown. We cultured primary HTM cells on polyacrylamide gels with tunable stiffness corresponding to Young's moduli ranging from 1.1 to 50 kPa. Then next‐generation RNA sequencing (RNA‐seq) was performed to obtain the transcriptomic profiles of HTM cells. Bioinformatics analysis revealed that genes related to glaucoma including DCN, SPARC, and CTGF, were significantly increased with elevated substrate stiffness, as well as the global alteration of HTM transcriptome. Extracellular matrix (ECM)‐related genes were selectively activated in response to the elevated substrate stiffness, consistent with the known molecular alteration in glaucoma. Human normal and glaucomatous TM tissues were also obtained to perform RNA‐seq experiments and supported the substrate stiffness‐altered transcriptome profiles from the in vitro cell model. The current study profiled the transcriptomic changes in human TM cells upon increasing substrate stiffness. Global change of ECM‐related genes indicates that the in vitro substrate stiffness could greatly affect the biological processes of HTM cells. The in vitro HTM cell model could efficiently capture the main pathogenetic process in glaucoma patients, and provide a powerful method to investigate the underlying molecular mechanisms.
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Project description:In vitro cultures of primary cardiac fibroblasts (CFs), the major extracellular matrix (ECM)-producing cells of the heart, are used to determine molecular mechanisms of cardiac fibrosis. However, the supraphysiologic stiffness of tissue culture polystyrene (TCPS) automatically triggers the conversion of CFs into an activated myofibroblast-like state, and serial passage of the cells results in the induction of replicative senescence. These dramatic phenotypic switches confound interpretation of experimental data obtained with cultured CFs. In an attempt to circumvent TCPS-induced activation and senescence of CFs, we utilized poly (ethylene glycol) (PEG) hydrogels as cell culture platforms with low and high stiffness formulations to mimic healthy and fibrotic cardiac ECM, respectively. As hypothesized, low hydrogel stiffness converted activated CFs into a quiescent state with reduced abundance of a-smooth muscle actin (a-SMA)-containing stress fibers. Unexpectedly, lower substrate stiffness concomitantly augmented CF senescence, marked by elevated senescence-associated b-galactosidase (SA-b-Gal) activity and increased expression of p16 and p21, which are cyclin-dependent kinase (CDK) inhibitors and markers of senescence. Using dynamically stiffening hydrogels with phototunable crosslinking capabilities, we demonstrate that substrate-induced CF senescence is partially reversible. RNA-sequencing analysis revealed widespread transcriptional reprogramming of CFs cultured on low stiffness hydrogels, with a dramatic reduction in the expression of profibrotic genes encoding ECM proteins, and an attendant increase in expression of NF-kB-responsive inflammatory genes that typify the senescence-associated secretory phenotype (SASP). Our findings further demonstrate that alterations in matrix stiffness profoundly impact CF cell state transitions, and suggest mechanisms by which CFs change phenotype in vivo depending on the stiffness of the myocardial microenvironment to which they are exposed.
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