Dataset Information

TMT-FASP-LC-MS analysis of human pediatric omental biopsies

ABSTRACT: Cardiovascular disease (CVD) is exceedingly severe in patients with chronic kidney disease (CKD) and further aggravated by peritoneal dialysis (PD), exposing the patients to excessive amounts of intraperitoneal glucose. Children are devoid of pre-existing CVD and give insight into specific uremia and PD induced pathomechanisms. Fat surrounded omental arterioles beyond PD fluid penetration level were microdissected from uremic children at time of first PD catheter insertion (n=8), children on PD (n=5), and age and gender matched non-uremic children as controls (n=6). Adjacent sections of 4 arterioles per patient were used for proteomic analyses.

INSTRUMENT(S): Q Exactive

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Arteriole, Peritoneum

DISEASE(S): Uremia

SUBMITTER: Klaus Kratochwill

LAB HEAD: Klaus Kratochwill

PROVIDER: PXD006298 | Pride | 2019-11-08

REPOSITORIES: Pride

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Publications

Complement Activation in Peritoneal Dialysis-Induced Arteriolopathy.

Bartosova Maria M Schaefer Betti B Bermejo Justo Lorenzo JL Tarantino Silvia S Lasitschka Felix F Macher-Goeppinger Stephan S Sinn Peter P Warady Bradley A BA Zaloszyc Ariane A Parapatics Katja K Májek Peter P Bennett Keiryn L KL Oh Jun J Aufricht Christoph C Schaefer Franz F Kratochwill Klaus K Schmitt Claus Peter CP

Journal of the American Society of Nephrology : JASN 20171018 1

Cardiovascular disease (CVD) is the leading cause of increased mortality in patients with CKD and is further aggravated by peritoneal dialysis (PD). Children are devoid of preexisting CVD and provide unique insight into specific uremia- and PD-induced pathomechanisms of CVD. We obtained peritoneal specimens from children with stage 5 CKD at time of PD catheter insertion (CKD5 group), children with established PD (PD group), and age-matched nonuremic controls (<i>n</i>=6/group). We microdissected ...[more]

PMID: 29046343

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Project description:Loss of ultrafiltration capacity in peritoneal dialysis (PD) patients is often associated with peritoneal vascular changes, manifest as diabetes-like vasculopathy and angiogenesis. The endothelial monolayer lining the vessel lumen controls vessel barrier function and thereby influences peritoneal substrate transport and ultrafiltration. In this study, we first characterized the response to conventional PD fluids of endothelial cells isolated from peritoneal biopsies of children undergoing PD. 9 omental biopsies from the pediatric biopsy biobank (mean age 5.7 years) were included in this study. PD patients were treated with conventional PD fluid (mean PD vintage 12.5 months). Age-matched controls (n=5) with normal renal function undergoing elective surgery were also included. In patients on PD, the biopsy sampling site was at least 5 cm away from the PD catheter entry site. Written informed consent was obtained from parents, and from patients as appropriate. The study was performed according to the Declaration of Helsinki and registered at www.clinicaltrials.gov (NCT01893710). The study was part of the International Pediatric Dialysis Network (IPDN; www.pedpd.org). Patients with a BMI of >35 kg/m2 and with chronic inflammatory diseases were excluded. Specimens obtained during surgery were instantaneously frozen with liquid nitrogen and stored at -80°C. Arterioles macroscopically located within fat tissue and microscopically at least 1mm distant from the peritoneal surface were micro-dissected. Elastica van Gieson stainings of the arteriolar elastic lamina were used as templates for microdissection of arterioles from cresol violet–stained neighboring sections. 100 µm thick tissue slices were cut with a cryotome and 30 deep-frozen arteriolar rings per patient were micro-dissected using a stereo microscope and a microneedle. Arteriolar rings were lysed in 100 µl lysis buffer (30 mM Tris, pH 8.5, 7M urea, 2M thiourea, 4% 3-[(3-Cholamidopropyl) dimethylammonio]-1-propanesulfonate (CHAPS), 1 mM EDTA, 1 tablet of Complete Protease Inhibitor (Roche, Basel, Switzerland) and 1 tablet of phosphatase inhibitor (PhosSTOP, Roche) per 100 ml). The resulting lysates were stored at -80°C until further processing. Total protein concentration was determined with the 2D-Quant kit (GE). Quality control and verification of protein concentrations was performed by SDS-PAGE. We investigated the molecular mechanisms of endothelial cell pathology during in vivo and in vitro PD fluid exposure by proteomic and bioinformatic analysis of the endothelial cell response to hyperglycemic stress, integrating current understanding of PD-related cellular injury and stress responses (Bender et al., Nephrol Dial Transplant, 2011, doi:10.1093/ndt/gfq484; Kratochwill et al., BioMed research international, 2015, doi:10.1155/2015/628158; Kratochwill et al., J Proteome Res, 2009, doi:10.1021/pr800916s; Lechner et al., J Proteome Res, 2010, doi:10.1021/pr9011574).

Project description:Little is known about the alterations in microRNA (miRNA) expression patterns during the consecutive stages of cervical cancer development and their association with chromosomal instability and epigenetic changes. We integrated miRNA expression profiles in normal cervical squamous epithelium, high-grade precancerous lesions (CIN2-3), squamous cell carcinomas (SCC) and adenocarcinomas (AdCAs) with previously generated chromosomal profiles of the same samples. In addition, the DNA methylation status of downregulated miRNAs located in a CpG island was determined. Significantly differential expression during the consecutive stages of cervical SCC development was observed for 106 miRNAs. Altered expression of 5 significantly differentially expressed miRNAs, hsa-miR-9 (1q23.2), hsa-miR-15b (3q25.32), hsa-miR-28-5p (3q27.3), hsa-miR-100 and hsa-miR-125b (both 11q24.1) was directly linked to frequent chromosomal alterations. Another 9 significantly downregulated miRNAs were located within a CpG island. Three of these 9 miRNAs, hsa-miR-203, hsa-miR-572, and hsa-miR-638, showed increased methylation in cervical cancer cell lines and HPV-immortalised cells compared to primary keratinocytes. Functional analyses were performed for hsa-miR-9, representing a potential oncogene with increased expression linked to a chromosomal gain, and hsa-miR-203, representing a potential tumour suppressor gene silenced by DNA methylation. Hsa-miR-9 and hsa-miR-203 were found to alter cell viability and anchorage independent growth in vitro, respectively, supporting their oncogenic and tumour suppressive function in cervical cancer. In conclusion, differential expression of 106 miRNAs, partly associated with chromosomal alterations and epigenetic changes, was observed during cervical SCC development. Altered expression of hsa-miR-9 and hsa-miR-203 was shown to be functionally relevant, underlining the importance of deregulated miRNA expression in cervical carcinogenesis. 10 squamous cell carcinomas of the cervix, 9 adenocarcinomas of the cervix, 18 high-grade cervical intraepithelial neoplasias (CIN2-3), and 10 cervical squamous epithelial samples with normal histology were analysed using single channel (Cy3) miRNA microarrays from Agilent (G4471A-016436).

Dataset Information

TMT-FASP-LC-MS analysis of human pediatric omental biopsies

Publications

Complement Activation in Peritoneal Dialysis-Induced Arteriolopathy.

Similar Datasets

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