Female mice exposed to low-doses of dioxin during pregnancy and lactation have increased susceptibility to diet-induced obesity and diabetes

Hoyeck, Myriam P; Merhi, Rayanna C; Blair, Hannah L; Spencer, C Duncan; Payant, Mikayla A.; Alfonso, Diana I. Martin; Zhang, Melody; Matteo, Geronimo; Chee, Melissa J.; Bruin, Jennifer E.

doi:10.1101/2020.07.09.195552

Cited by 1 publication

(2 citation statements)

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“…We have reported induction of Cyp1a1 in mouse and human islets following direct exposure to TCDD/dioxin or dioxin-like pollutants in vitro and in mouse islets following systemic administration of TCDD in vivo ( 73 ). Moreover, in pregnant TCDD-exposed mice, Cyp1a1 was induced 17-fold in pancreas compared to only 3-fold and 7-fold in liver and adipose, respectively ( 74 ). Therefore, pancreatic cells are not only directly exposed to pollutants in vivo , but may even act as a “sink” for long-term storage of lipophilic chemicals, similar to adipose depots.…”

Section: Toxicity Testing In Pancreatic β-Cellsmentioning

confidence: 99%

“…Additionally, we and others have shown that dioxin suppresses insulin secretion in rodent islets ( 73 , 79 , 80 ) and human islets ( 73 ). Interestingly, acute high-dose dioxin exposure caused β-cell apoptosis in male mice but not female mice ( 81 ), whereas prolonged low-dose dioxin exposure led to impaired β-cell adaptation to high fat diet feeding in female but not male mice ( 74 , 82 ).…”

Section: Toxicity Testing In Pancreatic β-Cellsmentioning

confidence: 99%

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Human Pluripotent Stem Cells: A Unique Tool for Toxicity Testing in Pancreatic Progenitor and Endocrine Cells

MacFarlane

Bruin

2021

Front. Endocrinol.

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Diabetes prevalence is increasing worldwide, and epidemiological studies report an association between diabetes incidence and environmental pollutant exposure. There are >84,000 chemicals in commerce, many of which are released into the environment without a clear understanding of potential adverse health consequences. While in vivo rodent studies remain an important tool for testing chemical toxicity systemically, we urgently need high-throughput screening platforms in biologically relevant models to efficiently prioritize chemicals for in depth toxicity analysis. Given the increasing global burden of obesity and diabetes, identifying chemicals that disrupt metabolism should be a high priority. Pancreatic endocrine cells are key regulators of systemic metabolism, yet often overlooked as a target tissue in toxicology studies. Immortalized β-cell lines and primary human, porcine, and rodent islets are widely used for studying the endocrine pancreas in vitro, but each have important limitations in terms of scalability, lifespan, and/or biological relevance. Human pluripotent stem cell (hPSC) culture is a powerful tool for in vitro toxicity testing that addresses many of the limitations with other β-cell models. Current in vitro differentiation protocols can efficiently generate glucose-responsive insulin-secreting β-like cells that are not fully mature, but still valuable for high-throughput toxicity screening in vitro. Furthermore, hPSCs can be applied as a model of developing pancreatic endocrine cells to screen for chemicals that influence endocrine cell formation during critical windows of differentiation. Given their versatility, we recommend using hPSCs to identify potential β-cell toxins, which can then be prioritized as chemicals of concern for metabolic disruption.

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Section: Toxicity Testing In Pancreatic β-Cellsmentioning

confidence: 99%