A new study reports that chronic exposure to arsenic interferes with insulin secretion in the pancreas, which may increase the risk of diabetes.
The paper, published ahead of print in the American Journal of Physiology — Regulatory, Integrative and Comparative Physiology, was chosen as an APSselect article for January.
Arsenic is an element that occurs naturally in soil, plants and water in small amounts. Long-term exposure to higher levels of environmental arsenic has been linked to cancer, heart disease, and other health problems and ingestion of large doses can be lethal.
The World Health Organization estimates that millions of people around the globe are exposed to unsafe levels of arsenic contamination in their water supply.
While sub-toxic levels of arsenic may not be fatal, they can still be dangerous, and researchers suggest “the metabolic risk imposed by arsenic is likely underestimated.”
The research team studied male mice exposed to sub-toxic levels of arsenic to simulate chronic exposure to arsenic-contaminated drinking water.
When compared with a control group, the arsenic-exposed mice exhibited higher blood glucose levels due to reduced insulin secretion during the early phases of a glucose tolerance test.
Insulin is the primary hormone responsible for transporting glucose out of the blood and into body tissues. Impairments in insulin secretion play a central role in the development of diabetes.
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