Our results indicate that pro-oxidant concentrations of retinol i

Our results indicate that pro-oxidant concentrations of retinol induce the activation of redox-sensitive pathways which result in the up-regulation of RAGE in cultured Sertoli cells. Pregnant Wistar rats were housed individually in Plexiglas cages. Litters were restricted to eight pups each. Animals were maintained selleck inhibitor on a 12-h light/dark cycle at a

constant temperature of 23 °C, with free access to commercial food and water. Male immature rats (15 days old) were killed by cervical dislocation. All procedures were approved by the Local Ethics Committee Board of UFRGS. All-trans retinol alcohol, Trolox, 2′,7′-dichlorohydrofluorescein diacetate (DCFH-DA), 3-(4,5-dimethyl)-2,5-diphenyl tetrazolium bromide (MTT), Tween-20, and β-mercaptoethanol were from Sigma Chemical Co. (St. Louis, MO, USA). Retinol was dissolved in ethanol. Concentrated stocks were prepared immediately before experiments by diluting retinol into ethanol and determining final stock concentration by UV absorption; solution was kept protected from light and temperature during all procedures. Appropriate solvent controls were performed for each condition. Treatments were initiated by adding concentrated solutions to reach final concentrations

in the well. The final ethanol concentration did not exceed 0.2% Gefitinib purchase in any experiment. Tissue culture reagents were from Gibco (Invitrogen Corporation, Carlsbad, CA, USA) and were of tissue Inositol monophosphatase 1 culture grade. Rabbit polyclonal anti-RAGE was from Santa Cruz Biotechnology (Santa Cruz, CA, USA). Mouse monoclonal anti-β-actin was from Sigma. Rabbit polyclonal anti-p38 (phosphorylated form) and anti-Akt (phosphorylated form) were from Santa Cruz. Sodium dodecyl sulphate (SDS)–polyacrylamide gel electrophoresis (PAGE) reagents were from Bio-Rad Laboratories (Hercules, CA, USA), nitrocellulose membrane (Hybond ECL), enhanced chemiluminescence kit (ECL plus), and anti-rabbit immunoglobulin (horseradish peroxidase-linked whole antibody from donkey) were from Amersham Pharmacia Biotech (Amersham,

UK). UO126 was from Promega Corporation (Madison, WI, USA), GÖ6983 and SB203580 were from Merck Biosciences (Darmstadt, Germany) and H89 was from Biomol Research Laboratories (Plymouth Meeting, PA, USA). Other kinase inhibitors were a kind gift from Professor Peter Dunkley (University of Newcastle, NSW, Australia). Sertoli cells were isolated as previously described (Pasquali et al., 2008). Briefly, testes of 15-day-old rats were removed, decapsulated and digested enzymatically with trypsin and deoxyribonuclease for 30 min at 37 °C, and centrifuged at 750 × g for 5 min. The pellet was mixed soybean trypsin inhibitor, then centrifuged and incubated with collagenase and hyaluronidase for 30 min at 37 °C. After incubation, this fraction was centrifuged (10 min at 40 × g). The pellet was taken to isolate Sertoli cells and supernatant was discarded.

Leave a Reply

Your email address will not be published. Required fields are marked *


You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>