Project description:Microarrays were used to analyse gene expression underlying early tumourigenesis in Eker rats. Distinct classes of up- and downregulated genes were identified in different preneoplasic lesion vs. microdissected normal (healthy) renal tubules. Laser capture microdissected renal basophilic atypical tubule (bAT) and basophilic atypical hyperplasia (bAH) and healthy tissue (HT) of 6-months aristolochic acid (AA)- and ochratoxin A (OTA)-treated and control (C) male Eker rats were isolated for RNA extraction and microarray analysis in order to investigate gene expression profiles induced by AA and OTA as well as to differentiate pathways specific for the bAT to bAH progression. Keywords: gene expression study, preneoplasic lesion vs. microdissected normal renal tubules
Project description:To clarify the effects of cisplatin (cis-diamminedichloroplatinum II, CDDP) on the gene expression profiles in renal proximal tubules, microarray analyses were carried out using total RNA samples isolated from microdissected proximal tubules and whole kidneys. The molecular events underlying acute kidney injury (AKI) in the proximal tubules of rats with cisplatin-induced nephrotoxicity were successfully clarified with 17,000 transcripts. Renal proximal tubules were isolated under microscopy, and transcriptome data were collected with Rat Genome Survey Microarray® (Applied Biosystems)
Project description:To clarify the effects of cisplatin (cis-diamminedichloroplatinum II, CDDP) on the gene expression profiles in renal proximal tubules, microarray analyses were carried out using total RNA samples isolated from microdissected proximal tubules and whole kidneys. The molecular events underlying acute kidney injury (AKI) in the proximal tubules of rats with cisplatin-induced nephrotoxicity were successfully clarified with 17,000 transcripts.
Project description:Microarrays were used to analyse gene expression underlying early tumourigenesis in Eker rats. Distinct classes of up- and downregulated genes were identified in different preneoplasic lesion vs. microdissected normal (healthy) renal tubules. Laser capture microdissected renal basophilic atypical tubule (bAT) and basophilic atypical hyperplasia (bAH) and healthy tissue (HT) of 6-months aristolochic acid (AA)- and ochratoxin A (OTA)-treated and control (C) male Eker rats were isolated for RNA extraction and microarray analysis in order to investigate gene expression profiles induced by AA and OTA as well as to differentiate pathways specific for the bAT to bAH progression. Keywords: gene expression study, preneoplasic lesion vs. microdissected normal renal tubules For microdissection of preneoplastic lesions from H&E stained renal cryosections, a PALM laser microdissection and pressure catapulting (LMPC) system (PALM Microlaser GmbH) was used. Atypical tubule (bAT), basophilic atypical hyperplasia (bAH) or healthy tissue (HT) were micodissected separately from each of three replicatemale Eker rats per dose group. Lesions of each type or HT from each individual animal were pooled. RNA isolation from pooled samples and subsequent Affymetrix Rat Genome RAE_230A_2.0 chip hybridization was carried out as previously described (Stemmer et al., Toxicology and Applied Pharmacology(2006) Nov 15;217(1):134-42). Time matched controls for microarrays from lesions of OTA and AA treated rats are specified as C(AA) and C(OTA).
Project description:Circadian variability in kidney function has long been recognized but is often ignored as a potential confounding variable in in vivo physiological experiments. To provide a guide for physiological studies on the kidney proximal tubule, we have now created a data resource consisting of expression levels for all measurable mRNA transcripts in microdissected proximal tubule segments from mice as a function of the time of day. This approach employs small-sample RNA-sequencing (RNA-seq) applied to microdissected renal proximal tubules including both S1 proximal convoluted tubules (PCTs) and S2 proximal straight tubules (PSTs). The data were analyzed using JTK-Cycle to detect periodicity. The data are provided as a user-friendly web page at https://esbl.nhlbi.nih.gov/Databases/Circadian-Prox/. In PCTs, 234 transcripts were found to vary in a circadian manner (3.7 % of total quantified). In PSTs, 334 transcripts were found to vary in a circadian manner (5.3 % of total quantified). Transcripts previously known to be associated with corticosteroid action and transcripts associated with increased flow were found to be overrepresented among circadian transcripts peaking during the “dark” portion of the day (Zeitgeber 14-22), corresponding to the peak levels of corticosterone and glomerular filtration rate in mice.