scholarly journals Molecular Basis for Endocrine Disruption by Pesticides Targeting Aromatase and Estrogen Receptor

2020 ◽  
Vol 17 (16) ◽  
pp. 5664 ◽  
Author(s):  
Chao Zhang ◽  
Tiziana Schilirò ◽  
Marta Gea ◽  
Silvia Bianchi ◽  
Angelo Spinello ◽  
...  
Keyword(s):  
Competitive Inhibition ◽  
Estrogenic Activity ◽  
Endocrine Disrupting Chemicals ◽  
Binding Mode ◽  
Inhibition Mechanism ◽  
Aromatase Activity ◽  
Docking Simulations ◽  
Potential Binding ◽  
Endocrine Disrupting ◽  
17Β Estradiol

The intensive use of pesticides has led to their increasing presence in water, soil, and agricultural products. Mounting evidence indicates that some pesticides may be endocrine disrupting chemicals (EDCs), being therefore harmful for the human health and the environment. In this study, three pesticides, glyphosate, thiacloprid, and imidacloprid, were tested for their ability to interfere with estrogen biosynthesis and/or signaling, to evaluate their potential action as EDCs. Among the tested compounds, only glyphosate inhibited aromatase activity (up to 30%) via a non-competitive inhibition or a mixed inhibition mechanism depending on the concentration applied. Then, the ability of the three pesticides to induce an estrogenic activity was tested in MELN cells. When compared to 17β-estradiol, thiacloprid and imidacloprid induced an estrogenic activity at the highest concentrations tested with a relative potency of 5.4 × 10−10 and 3.7 × 10−9, respectively. Molecular dynamics and docking simulations predicted the potential binding sites and the binding mode of the three pesticides on the structure of the two key targets, providing a rational for their mechanism as EDCs. The results demonstrate that the three pesticides are potential EDCs as glyphosate acts as an aromatase inhibitor, whereas imidacloprid and thiacloprid can interfere with estrogen induced signaling.

2D/2D Bi2WO6/Protonated g-C3N4 Step-scheme Heterojunctions for Enhancing Photodegradation of 17β-Estradiol: Promotional Role of Electrostatic Interaction

2022 ◽  
Author(s):  
Yashi Qing ◽  
Yanxiang Li ◽  
Dan Hu ◽  
Zhiwei Guo ◽  
Yujie Yang ◽  
...  
Keyword(s):  
Human Health ◽  
Electrostatic Interaction ◽  
Estrogenic Activity ◽  
Endocrine Disrupting Chemicals ◽  
Endocrine Disrupting ◽  
17Β Estradiol

17β-Estradiol (E2) is a type of endocrine disrupting chemicals (EDCs) with the strongest estrogenic activity which poses a huge threat to the ecosystems and human health even at extremely low...

Assessing Estrogenic Activities of Selected Endocrine Disrupting Chemicals and their Combination Effects

2013 ◽  
Vol 765-767 ◽  
pp. 2944-2948 ◽  
Author(s):  
Xiao Ling Shao ◽  
Wen Qi Zhong ◽  
Xiao Yan Ma ◽  
Ang Gao ◽  
Xiang Yang Wu ◽  
...  
Keyword(s):  
Binary Systems ◽  
Endocrine Disrupting Chemicals ◽  
Concentration Addition ◽  
Multicomponent Mixtures ◽  
Yeast Two Hybrid ◽  
Yeast Two Hybrid System ◽  
Endocrine Disrupting ◽  
17Β Estradiol ◽  
Ethylhexyl Phthalate ◽  
Two Hybrid

Yeast two-hybrid system was used to investigate the estrogenic activities of 13 kinds of representative endocrine disrupting chemicals (EDCs) and their combinary effects. Results show that the order of estrogenic potencies for these chemicals is: 17α-ethynylestradiol>diethylstilbestrol >17β-estradiol>estrone>estriol>branchedp-nonylphenol>4-t-octylphenol>bisphenol A>diethyl phthalate>4-n-nonylphenol>di-(2-ethylhexyl) phthalate>dibutyl phthalate>dimethyl phthalate. The mixture effects of multiple EDCs were compared to those obtained from individual chemicals, using the model of concentration addition. Results reveal that the estrogenicities of multicomponent mixtures of more than three (including three) of EDCs follow antagonistic effects, while there is no definite conclusion for binary systems. The less than additive effects were also confirmed in the spiked experiments conducted in the extracts of real water samples.

scholarly journals In Vivo Testing System for Determining the Estrogenic Activity of Endocrine-Disrupting Chemicals(EDCs) in Goldfish (Carassius auratus).

2001 ◽  
Vol 47 (2) ◽  
pp. 213-218 ◽  
Author(s):  
Hiroshi Ishibashi ◽  
Katsuyasu Tachibana ◽  
Mutsuyosi Tsuchimoto ◽  
Kiyoshi Soyano ◽  
Yasuhiro Ishibashi ◽  
...  
Keyword(s):  
Carassius Auratus ◽  
Estrogenic Activity ◽  
Endocrine Disrupting Chemicals ◽  
Testing System ◽  
Goldfish Carassius Auratus ◽  
Endocrine Disrupting ◽  
In Vivo Testing

Direct oxidation treatment by a novel 3-dimensional electrolytic cell reactor

2006 ◽  
Vol 6 (2) ◽  
pp. 87-91
Author(s):  
Y. Sakakibara ◽  
Y. Sena ◽  
M. Prosnansky
Keyword(s):  
Endocrine Disrupting Chemicals ◽  
Electrolytic Cell ◽  
Chlorinated Phenols ◽  
Direct Oxidation ◽  
Nonyl Phenol ◽  
Oxidation Treatment ◽  
3 Dimensional ◽  
Endocrine Disrupting ◽  
Cell Reactor ◽  
17Β Estradiol

The\ performance of a novel 3-dimensional electrolytic cell reactor for the treatment of dilute solutions was investigated using different dyes (potassium indigotrisulfonate (PI), Orange 2 and Amaranth) and endocrine disrupting chemicals (EDCs). Continuous experiments demonstrated that the present electrolytic cell reactor was able to directly oxidize the dyes on the surface of the electrode very quickly in response to a change in electric current. It is interesting to note that the energy consumption for the oxidation of PI and Orange 2 was significantly smaller than for the commercially available ozone generators. The electrolytic reactor was also successfully applied to the treatment of trace EDCs including 17β-estradiol, bisphenol-A, nonyl-phenol and chlorinated phenols.

Inhibitory Effect of Sesamolin on Melanogenesis in B16F10 Cells Determined by In Vitro and Molecular Docking Analyses

2020 ◽  
Vol 21 (2) ◽  
pp. 169-178
Author(s):  
Seung-Hwa Baek ◽  
Myung-Gyun Kang ◽  
Daeui Park
Keyword(s):  
Molecular Docking ◽  
Competitive Inhibition ◽  
Docking Simulation ◽  
Melanoma Cells ◽  
Inhibition Mechanism ◽  
Dual Function ◽  
Dependent Manner ◽  
Related Factors ◽  
Docking Simulations

Background: Melanin protects the skin against the harmful effects of ultraviolet irradiation. However, melanin overproduction can result in several aesthetic problems, including melasma, freckles, age spots and chloasma. Therefore, development of anti-melanogenic agents is important for the prevention of serious hyperpigmentation diseases. Sesamolin is a lignan compound isolated from sesame seeds with several beneficial properties, including potential for melanin inhibition. Objective: The aim of this study was to evaluate the anti-melanogenic effect of sesamolin in cell culture in vitro and the underlying mechanism of inhibition using molecular docking simulation. Methods: Melanogenesis was induced by 3-isobutyl-1-methylxanthine in B16F10 melanoma cells, and the inhibitory effects of sesamolin were evaluated using zymography, a tyrosinase inhibitory activity assay, western blotting, and real-time reverse transcription-polymerase chain reaction analysis. Docking simulations between sesamolin and tyrosinase were performed using Autodock vina. Results: Sesamolin significantly inhibited the expression of melanogenesis-related factors tyrosinase, and tyrosinase-related proteins 1 and 2 at the mRNA and protein levels. Treatment of melanoma cells with 50 µM sesamolin demonstrated the strongest inhibition against intercellular tyrosinase and melanin synthesis without exerting cytotoxic effects. Sesamolin significantly reduced mushroom tyrosinase activity in a dose-dependent manner via a competitive inhibition mechanism. Tyrosinase docking simulations supported that sesamolin (-6.5 kcal/mol) bound to the active site of tyrosinase more strongly than the positive control (arbutin, -5.7 kcal/mol). Conclusion: Sesamolin could be developed as a melanogenesis inhibiting agent owing to its dual function in blocking the generation of melanogenesis-related enzymes and inhibiting the enzymatic response of tyrosinase.

scholarly journals Estrogenic activity, selected plasticizers and potential health risks associated with bottled water in South Africa

2018 ◽  
Vol 16 (2) ◽  
pp. 253-262 ◽  
Author(s):  
Natalie H. Aneck-Hahn ◽  
Magdalena C. Van Zijl ◽  
Pieter Swart ◽  
Barry Truebody ◽  
Bettina Genthe ◽  
...  
Keyword(s):  
South Africa ◽  
Health Risks ◽  
Water Consumption ◽  
Estrogenic Activity ◽  
Solid Phase ◽  
Endocrine Disrupting Chemicals ◽  
Bottled Water ◽  
Potential Health ◽  
Gene Assay ◽  
17Β Estradiol

Abstract Potential endocrine disrupting chemicals (EDCs) are present in bottled water from various countries. In South Africa (SA), increased bottled water consumption and concomitant increases in plastic packaging create important consequences for public health. This study aimed to screen SA bottled water for estrogenic activity, selected target chemicals and assessing potential health risks. Ten bottled water brands were exposed to 20 °C and 40 °C over 10 days. Estrogenic activity was assessed using the recombinant yeast estrogen screen (YES) and the T47D-KBluc reporter gene assay. Solid phase extracts of samples were analyzed for bis(2-ethylhexyl) adipate (DEHA), selected phthalates, bisphenol-A (BPA), 4-nonylphenol (4-NP), 17β-estradiol (E2), estrone (E1), and ethynylestradiol (EE2) using gas chromatography–mass spectrophotometry. Using a scenario-based health risk assessment, human health risks associated with bottled water consumption were evaluated. Estrogenic activity was detected at 20 °C (n = 2) and at 40 °C (n = 8). Estradiol equivalent (EEq) values ranged from 0.001 to 0.003 ng/L. BPA concentrations ranged from 0.9 ng/L to 10.06 ng/L. Although EEqs and BPA concentrations were higher in bottled water stored at 40 °C compared to 20 °C, samples posed an acceptable risk for a lifetime of exposure. Irrespective of temperature, bottled water from SA contained chemicals with acceptable health risks.

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