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Label-free based quantitative proteomics analysis of primary neonatal porcine Leydig cells exposed to the persistent contaminant 3-methylsulfonyl-DDE
Norwegian Univ Life Sci, Sect Expt Biomed, Oslo, Norway.;Mekelle Univ, Coll Vet Med, Mekelle, Ethiopia..
Norwegian Univ Life Sci, Sect Expt Biomed, Oslo, Norway..
Norwegian Univ Life Sci, Sect Expt Biomed, Oslo, Norway..
Norwegian Univ Life Sci, Sect Expt Biomed, Oslo, Norway..
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2016 (English)In: Journal of Proteomics, ISSN 1874-3919, E-ISSN 1876-7737, Vol. 137, 68-82 p.Article in journal (Refereed) PublishedText
Abstract [en]

Evidence that persistent environmental pollutants may target the male reproductive system is increasing. The male reproductive system is regulated by secretion of testosterone by testicular Leydig cells, and perturbation of Leydig cell function may have ultimate consequences. 3-Methylsulfonyl-DDE (3-MeSO2-DDE) is a potent adrenal toxicants formed from the persistent insecticide DDT. Although studies have revealed the endocrine disruptive effect of 3-MeSO2-DDE, the underlying mechanisms at cellular level in steroidogenic Leydig cells remains to be established. The current study addresses the effect of 3-MeSO2-DDE on viability, hormone production and proteome response of primary neonatal porcine Leydig cells. The AlamarBlue (TM) assay was used to evaluate cell viability. Solid phase radioimmunoassay was used to measure concentration of hormones produced by both unstimulated and Luteinizing hormone (LH)-stimulated Leydig cells following 48 h exposure. Protein samples from Leydig cells exposed to a non-cytotoxic concentration of 3-MeSO2-DDE (10 mu M) were subjected to nano-LC-MS/MS and analyzed on a Q Exactive mass spectrometer and quantified using label-free quantitative algorithm. Gene Ontology (GO) and Ingenuity Pathway Analysis (IPA) were carried out for functional annotation and identification of protein interaction networks. 3-MeSO2-DDE regulated Leydig cell steroidogenesis differentially depending on cell culture condition. Whereas its effect on testosterone secretion at basal condition was stimulatory, the effect on LH-stimulated cells was inhibitory. From triplicate experiments, a total of 6804 proteins were identified in which the abundance of 86 proteins in unstimulated Leydig cells and 145 proteins in LH-stimulated Leydig cells was found to be significantly regulated in response to 3-MeSO2-DDE exposure. These proteins not only are the first reported in relation to 3-MeSO2-DDE exposure, but also display small number of proteins shared between culture conditions, suggesting the action of 3-MeSO2-DDE on several targeted pathways, including mitochondrial dysfunction, oxidative phosphorylation, EIF2-signaling, and glutathione-mediated detoxification. Further identification and characterization of these proteins and pathways may build our understanding to the molecular basis of 3-MeSO2-DDE induced endocrine disruption in Leydig cells.

Place, publisher, year, edition, pages
2016. Vol. 137, 68-82 p.
Keyword [en]
Persistent organic pollutants, 3-Methylsulfonyl-DDE, Leydig cells, Steroidogenesis, Endocrine disruption, Proteomics, IPA, Sus scrofa
National Category
Biochemistry and Molecular Biology
Identifiers
URN: urn:nbn:se:uu:diva-297547DOI: 10.1016/j.jprot.2015.12.007ISI: 000374368800008PubMedID: 26691841OAI: oai:DiVA.org:uu-297547DiVA: diva2:942803
Funder
Swedish Research Council Formas, 2007-1267-10370-9
Available from: 2016-06-27 Created: 2016-06-23 Last updated: 2016-06-27Bibliographically approved

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