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Effects of combined treatment of α-tocopherol, L-ascorbic acid, selenium and zinc on bleomycin, etoposide and cisplatin-induced alterations in testosterone synthesis pathway in rats.

Cancer chemotherapy and pharmacology (2014-09-23)
Narayana Kilarkaje
ABSTRACT

To investigate the effects of therapeutically relevant dose levels of bleomycin, etoposide and cisplatin (BEP) on testicular steroidogenic enzymes, and possible protective effects of an antioxidant cocktail (AC). Adult Sprague-Dawley rats received BEP with or without the AC (α-tocopherol, L-ascorbic acid, selenium and zinc) for either (a) 4 days (short term; 1.5, 15 and 3 mg/kg), or (b) three cycles of 21 days each (0.75, 7.5 and 1.5 mg/kg), or (c) the three cycles with a 63-day recovery period. The expression of steroidogenic enzymes were measured in the testes by Western blotting and immunofluorescent labeling. The short-term BEP exposure resulted in a decrease in scavenger receptor class-B1 and an increase in luteinizing hormone receptor (LHR). The AC with or without BEP has increased the levels of LHR, 3β-hydroxysteroid dehydrogenase (3β-HSD) and 17β-HSD, but without significant changes in testosterone levels. The three cycles of BEP up-regulated the expression of steroidogenic acute regulatory protein (StAR) and down-regulated that of cholesterol side chain cleavage enzyme (P450scc), cytochrome p450 17A1 (Cyp17A1, recovered by the AC) and 17β-HSD, associated with significant reduction in testosterone levels. The three cycles with the recovery time led to decreases in LHR, StAR, P450scc and Cyp17A1 and increases in 3β-HSD and 17β-HSD. The AC did not enhance the recovery of the enzyme levels. The three cycles of BEP treatment inhibit the testosterone synthesis pathway even after the recovery time. The AC recovers the effects of BEP chemotherapy on a few steroidogenic enzymes.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Bleomycin sulfate from Streptomyces verticillus, crystalline, 1.5-2.0 U/mg
Sigma-Aldrich
(+)-α-Tocopherol, from vegetable oil, Type V, ~1000 IU/g
Sigma-Aldrich
Bleomycin sulfate from Streptomyces verticillus, for fluorescence, mixture of bleomycin sulfate salts, lyophilized, powder or crystals, white to off-white
Sigma-Aldrich
Zinc, granular, 30-100 mesh, 99%
Sigma-Aldrich
Zinc, purum, powder
Supelco
Ascorbic Acid, Pharmaceutical Secondary Standard; Certified Reference Material
Zinc, foil, 150x150mm, thickness 0.5mm, as rolled, 99.95+%
Zinc, foil, 0.5m coil, thickness 0.25mm, as rolled, 99.95+%
Zinc, foil, 300x300mm, thickness 1.0mm, as rolled, 99.99+%
Zinc, foil, 25x25mm, thickness 0.175mm, as rolled, 99.95+%
Zinc, foil, 0.5m coil, thickness 0.025mm, as rolled, 99.95+%
Zinc, foil, 50x50mm, thickness 0.25mm, as rolled, 99.95+%
Zinc, foil, 50x50mm, thickness 0.175mm, as rolled, 99.95+%
Zinc, foil, 25x25mm, thickness 0.1mm, as rolled, 99.95+%
Zinc, foil, 10mm disks, thickness 0.025mm, as rolled, 99.99+%
Zinc, foil, 500x500mm, thickness 1.0mm, as rolled, 99.7%
Zinc, foil, 10mm disks, thickness 0.20mm, as rolled, 99.95+%
Zinc, foil, 150x150mm, thickness 1.0mm, as rolled, 99.99+%
Zinc, foil, 0.3m coil, thickness 0.075mm, as rolled, 99.95+%
Zinc, foil, 15mm disks, thickness 1.0mm, as rolled, 99.95+%
Zinc, foil, 300x300mm, thickness 2.0mm, as rolled, 99.95+%
Zinc, foil, 15mm disks, thickness 0.015mm, 99.9%
Zinc, foil, 25x25mm, thickness 0.20mm, as rolled, 99.95+%
Zinc, foil, 0.5m coil, thickness 1.0mm, as rolled, 99.95+%
Zinc, foil, 10mm disks, thickness 0.05mm, as rolled, 99.95+%
Zinc, foil, 0.5m coil, thickness 1.5mm, as rolled, 99.95+%
Zinc, foil, 50x50mm, thickness 1.0mm, as rolled, 99.95+%
Zinc, foil, 0.5m coil, thickness 0.5mm, as rolled, 99.95+%
Zinc, foil, 300x300mm, thickness 1.0mm, as rolled, 99.95+%
Zinc, foil, 10mm disks, thickness 1.0mm, as rolled, 99.99+%