Dataset Information

Short-term administration of common anesthetics does not dramatically change the endogenous peptide profile in the rat pituitary

ABSTRACT: To identify and quantify the relative abundances of cell-cell signaling peptides in different physiological states, LC-MS-based peptidomics workflows are commonly utilized on freshly dissected tissue. In such animal experiments, the administration of general anesthetics is an important step for many research projects. However, acute anesthetic administration may rapidly change the measured abundance of transmitter molecules and metabolites which may confound experimental results. The aim of this study was to evaluate the effect of short-term (< 5 min) anesthetic administration on the measured abundance pituitary peptides, as evaluated by a typical peptidomics workflow. To accomplish this goal, we compared peptide abundances in the rat pituitary following administration of 5% isoflurane, 200 mg/kg sodium pentobarbital, or no anesthetic administration using a label-free peptidomics protocol.

INSTRUMENT(S): Xevo G2-XS QTof

ORGANISM(S): Rattus Norvegicus (rat)

TISSUE(S): Hypophysis

SUBMITTER: James Checco

LAB HEAD: James Checco

PROVIDER: PXD034821 | Pride | 2022-09-23

REPOSITORIES: Pride

ACCESS DATA

Dataset's files

Source:

			Action	DRS
	20211105_SM0837_Pituitary_02.mgf	Mgf
	20211105_SM0837_Pituitary_02.raw.rar	Raw
	20211105_SM0837_Pituitary_04.mgf	Mgf
	20211105_SM0837_Pituitary_04.raw.rar	Raw
	20211105_SM0837_Pituitary_06.mgf	Mgf

Items per page:

1 - 5 of 93

Similar Datasets

Project description:Background: Sepsis-associated encephalopathy (SAE) is a common and severe complication of sepsis. While several studies have reported the proteomic alteration in plasma, urine, heart, etc. of sepsis, few research focused on the brain tissue. This study aims at discovering the differentially abundant proteins in the brains of septic rats to identify biomarkers of SAE. Methods: The Prague-Dawley rats were randomly divided into sepsis (n = 6) or sham (n = 6) groups, and then the whole brain tissue was dissected at 24 h after surgery for further protein identification by TMT-LC–MS/MS-based proteomics. Ingenuity pathway analysis, Gene ontology knowledgebase, and STRING database are used to explore the biological significance of proteins with altered concentration. Results: Among the total of 3163 proteins identified in the brain tissue, 57 were increased while 38 were decreased in the sepsis group compared to the sham group. Bioinformatic analyses suggest that the differentially abundant proteins are highly related to cellular microtubule metabolism, energy production, nucleic acid metabolism, neurological disease, etc. Additionally, acute phase response signaling was possibly activated and PI3K/AKT signaling was suppressed during sepsis. An interaction network established by IPA revealed that Akt1, Gc-globulin, and ApoA1 were the core proteins. The increase of Gc-globulin and the decrease of Akt1 were confirmed by Western blot. Conclusions: Based on the multifunction of these proteins in several brain diseases, we first propose that Gc-globulin, ApoA1, PI3K/AKT pathway, and acute phase response proteins (hemopexin and cluster of alpha-2-macroglobulin) can potentially be diagnosis biomarkers, therapeutic targets, and prognosis indicators of SAE. These results may provide new insights into the pathologic mechanism of SAE, yet further research is required to explore the functional implications and clinical applications of the differentially abundant proteins in the brains of sepsis group.

Project description:Perfluorooctanesulfonate (PFOS) has been widely used in a variety of industrial and commercial applications as a surfactant and stain repellent. PFOS causes liver damage (including liver tumors) in experimental animals, primarily via interaction with PPARa and CAR/PXR. We investigated the involvement of microRNAs (miRNAs) in PFOS-induced hepatotoxicity, and mechanisms involved in abnormal TH homeostasis, in the livers of adult male rats exposed in feed to 50 mg PFOS/kg diet for 28 days. PFOS-treated rats exhibited expected histopathological and clinical chemistry changes. Global gene expression changes were consistent with the involvement of PPARα and CAR/PXR in PFOS-induced effects. Thirty-eight miRNAs were significantly altered. Three members of the miR-200 family were the most increased, while miR-122 and miR-21 were the most decreased, in PFOS-treated relative to control rats. Expression of the miR-23b/27b/24 cluster also decreased in PFOS-treated animals. Pathway analysis of miRNAs and associated gene expression changes demonstrated enrichment of transcripts involved in epithelial to mesenchymal transition (EMT), which is a primary process involved in tumor cell motility and cancer metastasis. Liver expression analysis revealed transcripts that may mediate PFOS effects on thyroid hormone (TH) homeostasis including: activation of the CAR/PXR pathway, phase II/III enzymes, and deiodinase. These changes are consistent with low serum TH due to enhanced metabolic clearance of TH. However, most TH hepatic target genes were not altered in a manner consistent with reduced TH signalling; suggesting that PFOS exposure did not induce functional hypothyroidism. Collectively, PFOS-induced miRNA perturbations were strongly associated with EMT suggesting an important role for miRNAs in PFOS-induced hepatotoxicity. The work also provides novel insights into the effects of PFOS on TH homeostasis. Total RNAs from liver samples (4 animals from each group) were labelled using the miRNA Complete Labelling and Hybridization kit (Agilent Technologies). Labelled RNA was hybridized on 8 X 15K Agilent rat miRNA microarray slides. Arrays were scanned using an Agilent G2505B scanner (5 μm resolution). Agilent Feature Extraction (version 10.7.3.1) was used to acquire the fluorescence intensity of each probe. The quality of the microarray data was evaluated using Agilent Feature Extraction quality control metrics. Data were normalized in R using cyclic-lowess (Bolstad et al., 2003). Ratio-intensity plots, boxplots and cluster analyses were used to identify potential outliers. One control sample failed the quality control tests and was eliminated for subsequent analyses. Statistically significantly altered miRNAs were identified using the methods described above for gene expression.

Dataset Information

Short-term administration of common anesthetics does not dramatically change the endogenous peptide profile in the rat pituitary

Dataset's files

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets