کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4530721 1324724 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Short-term exposure to the organotin compound triphenyltin modulates esterified steroid levels in females of Marisa cornuarietis
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم آبزیان
پیش نمایش صفحه اول مقاله
Short-term exposure to the organotin compound triphenyltin modulates esterified steroid levels in females of Marisa cornuarietis
چکیده انگلیسی
Long-term exposures to organotin compounds have shown alterations on endogenous steroid levels in gastropods together with the development of imposex. However, information regarding short-term effects of these compounds on the endocrine system of gastropods is lacking. This work aimed at investigating those responses in the ramshorn snail Marisa cornuarietis by looking at both endogenous levels of free and esterified steroids and the metabolism of the androgen precursor androstenedione by digestive gland/gonad microsomal fractions. One-week exposure to the organotin compound triphenyltin (TPT) led to a significant increase in esterified testosterone (60-85%) and a decrease in esterified estradiol (50-84%) in females, but had no effect on males. The observed alterations in esterified steroids were not directly related to changes in P450 aromatase activity that remained unchanged in exposed females. The enzymes involved in the metabolism of the androgen precursor androstenedione, namely 17β-hydroxysteroid dehydrogenases and 5α-reductases, were not significantly altered by TPT exposure, suggesting that such enzymes are not primary targets of TPT in M. cornuarietis. Additional studies are needed to fully understand the significance of the observed alterations in females and their potential relationship with the development of imposex.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Aquatic Toxicology - Volume 89, Issue 2, 29 August 2008, Pages 129-135
نویسندگان
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