scholarly journals First Approach to Screening Endocrine Disruption Activity in Sediments from the Uruguay River (Uruguay Coast)

2018 ◽  
Author(s):  
Noelia Rivas-Rivera ◽  
Gabriela Eguren
Keyword(s):  
Endocrine Disruption ◽  
Uruguay River

Screening of endocrine disruption activity in sediments from the Uruguay River

Ecotoxicology ◽  
2014 ◽  
Vol 23 (6) ◽  
pp. 1137-1142 ◽  
Author(s):  
Noelia Rivas-Rivera ◽  
Gabriela Eguren ◽  
Leonidas Carrasco-Letelier ◽  
Kelly R. Munkittrick
Keyword(s):  
Endocrine Disruption ◽  
Uruguay River

Uncertainties Associated with Assessing the Risk of an Endocrine Active Substance in the Canadian Environment

2001 ◽  
Vol 36 (2) ◽  
pp. 319-330 ◽  
Author(s):  
Mark Servos ◽  
Don Bennie ◽  
Kent Burnison ◽  
Philippa Cureton ◽  
Nicol Davidson ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Endocrine Disruption ◽  
Endocrine System ◽  
Problem Formulation ◽  
Normal Function ◽  
Weight Of Evidence ◽  
Biological Responses ◽  
Low Concentrations ◽  
Multigenerational Effects

Abstract A number of biological responses and multigenerational effects, mediated through the disruption of endocrine systems, have been observed in biota exposed to relatively low concentrations of environmental contaminants. These types of responses need to be considered within a weight of evidence approach in our risk assessment and risk management frameworks. However, including endocrine responses in an environmental risk assessment introduces a number of uncertainties that must be considered. A risk assessment of nonylphenol and nonylphenol polyethoxylates (NP/NPE) is used as a case study to demonstrate the sources and magnitude of some of the uncertainties associated with using endocrine disruption as an assessment endpoint. Even with this relatively well studied group of substances, there are substantial knowledge gaps which contribute to the overall uncertainties, limiting the interpretation within the risk assessment. The uncertainty of extrapolating from in vitro or biochemical responses to higher levels of organization or across species is not well understood. The endocrine system is very complex and chemicals can interact or interfere with the normal function of endocrine systems in a number of ways (e.g., receptors, hormones) which may or may not result in an adverse responses in the whole organism. Using endocrine responses can lead to different conclusions than traditional endpoints due to a variety of factors, such as differences in relative potencies of chemicals for specific endpoints (e.g., receptor binding versus chronic toxicity). The uncertainties can also be considerably larger and the desirability of using endocrine endpoints should be carefully evaluated. Endocrine disruption is a mode of action and not a functional endpoint and this needs to be considered carefully in the problem formulation stage and the interpretation of the weight of evidence.

scholarly journals Metabolic-endocrine disruption due to preterm birth impacts growth, body composition, and neonatal outcome

2021 ◽  
Author(s):  
Lea Sophie Möllers ◽  
Efrah I. Yousuf ◽  
Constanze Hamatschek ◽  
Katherine M. Morrison ◽  
Michael Hermanussen ◽  
...  
Keyword(s):  
Body Composition ◽  
Preterm Birth ◽  
Postnatal Development ◽  
Endocrine Disruption ◽  
Fat Mass ◽  
Neonatal Morbidity ◽  
Neonatal Outcomes ◽  
Endocrine Function ◽  
List Type ◽  
Term Infants

Abstract Despite optimized nutrition, preterm-born infants grow slowly and tend to over-accrete body fat. We hypothesize that the premature dissociation of the maternal–placental–fetal unit disrupts the maintenance of physiological endocrine function in the fetus, which has severe consequences for postnatal development. This review highlights the endocrine interactions of the maternal–placental–fetal unit and the early perinatal period in both preterm and term infants. We report on hormonal levels (including tissue, thyroid, adrenal, pancreatic, pituitary, and placental hormones) and nutritional supply and their impact on infant body composition. The data suggest that the premature dissociation of the maternal–placental–fetal unit leads to a clinical picture similar to panhypopituitarism. Further, we describe how the premature withdrawal of the maternal–placental unit, neonatal morbidities, and perinatal stress can cause differences in the levels of growth-promoting hormones, particularly insulin-like growth factors (IGF). In combination with the endocrine disruption that occurs following dissociation of the maternal–placental–fetal unit, the premature adaptation to the extrauterine environment leads to early and fast accretion of fat mass in an immature body. In addition, we report on interventional studies that have aimed to compensate for hormonal deficiencies in infants born preterm through IGF therapy, resulting in improved neonatal morbidity and growth. Impact Preterm birth prematurely dissociates the maternal–placental–fetal unit and disrupts the metabolic-endocrine maintenance of the immature fetus with serious consequences for growth, body composition, and neonatal outcomes. The preterm metabolic-endocrine disruption induces symptoms resembling anterior pituitary failure (panhypopituitarism) with low levels of IGF-1, excessive postnatal fat mass accretion, poor longitudinal growth, and failure to thrive. Appropriate gestational age-adapted nutrition alone seems insufficient for the achievement of optimal growth of preterm infants. Preliminary results from interventional studies show promising effects of early IGF-1 supplementation on postnatal development and neonatal outcomes.

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