The increased number of Leydig cells by di(2-ethylhexyl) phthalate comes from the differentiation of stem cells into Leydig cell lineage in the adult rat testis.
The objective of the present study is to determine whether di(2-ethylhexyl) phthalate (DEHP) exposure at adulthood increases rat Leydig cell number and to investigate the possible mechanism. 90-day-old Long-Evans rats were randomly divided into 3 groups, and were gavaged with the corn oil (control) or 10 or 750mg/kg DEHP daily for 7 days, and then received an intraperitoneal injection of 75mg/kg ethane dimethanesulfonate (EDS) to eliminate Leydig cells. Serum testosterone concentrations were assessed by RIA, and the mRNA levels of Leydig cell genes were measured by qPCR. EDS eliminated all Leydig cells in the control testis on day 4 post-EDS, as judged by undetectable serum testosterone level and no 3β-hydroxysteroid dehydrogenase positive (3β-HSD(pos)) cells in the interstitium. However, in DEHP-treated groups, there were detectable serum testosterone concentrations and some oval-shaped 3β-HSD(pos) cells in the interstitium. These 3β-HSD(pos) cells were not stained by the antibody against 11β-hydroxysteroid dehydrogenase 1 (11β-HSD1), a marker for Leydig cells at a more advanced stage. The disappearance of mRNAs of Leydig cell biomarkers including Lhcgr, Cyp11a1, Cyp17a1, Insl3 and Hsd11b1 in the control testis was observed on day 4 post-EDS. However, there were detectable concentrations of Lhcgr, Cyp11a1 and Cyp17a1 mRNAs but undetectable concentrations of Insl3, Hsd17b3 and Hsd11b1 in the DEHP-treated testes, indicating that these 3β-HSD(pos) cells were newly formed progenitor Leydig cells. The mRNA level for nestin (Nes, biomarker for stem Leydig cells) was significantly increased in the control testis on day 4 post-EDS, but not in the DEHP treated testes, suggesting that these nestin positive stem cells were differentiated into progenitor Leydig cells in the DEHP-treated testes. The present study suggests that DEHP increases the differentiation of stem cells into progenitor Leydig cells.
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CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL GENE-Y GENE-Y GENE-Y GENE-Y GENE-Y GENE-Y GENE-Y GENE-Y GENE-N CHEMICAL GENE-Y GENE-Y GENE-Y GENE-N GENE-N GENE-N GENE-N CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL
EDS testosterone EDS di(2-ethylhexyl) phthalate EDS testosterone 3β-hydroxysteroid DEHP testosterone DEHP 11β-hydroxysteroid di(2-ethylhexyl) phthalate 11β-hydroxysteroid dehydrogenase 1 11β-HSD Lhcgr Cyp11a1 Cyp17a1 Insl3 Hsd17b3 Hsd11b1 3β-HSD EDS nestin Nes nestin 3β-hydroxysteroid dehydrogenase 3β-HSD 3β-HSD 3β-HSD DEHP EDS DEHP DEHP DEHP DEHP ethane dimethanesulfonate