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Home NEWS Science News Health

Inadequate control of thyroid hormones sensitizes to hepatocarcinogenesis and unhealthy aging

Bioengineer by Bioengineer
October 2, 2019
in Health
Reading Time: 2 mins read
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The cover features Figure 7 ‘Schematic representation of the effects of the modulation of THs levels in healthspan and lifespan in mice’ from López-Noriega et al

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Herein, the authors show, using wild-type and the Pax8 ablated model of hypothyroidism in mice, that hyperthyroidism and severe hypothyroidism are associated with an overall unhealthy status and shorter lifespan.

Mild hypothyroid Pax8 +/- mice were heavier and displayed insulin resistance, hepatic steatosis and increased prevalence of liver cancer yet had normal lifespan.

Dr. Martin-Montalvo said, “The increasing burden of age-related diseases highlights the importance of uncovering the mechanisms underlying the aging process.”

TSH stimulates the production of T4 and T3 in the thyroid gland, which in turn inhibit both TRH and TSH synthesis when THs reach the hypothalamus and hypophysis, respectively.

Greater life expectancy has been associated with reduced circulating levels of T4, T3, and/or high TSH levels in both animal models and humans.

In this line, the Laron, Ames and Snell dwarf mice, which have reduced GH signalling and reduced circulating TH levels, exhibit a consistent exceptional lifespan as well as other metabolic alterations such as enhanced hepatic insulin sensitivity.

Both rodents and humans under calorie restriction, which comprises a variety of nutritional interventions with several beneficial effects including extended longevity, exhibit reduced circulating T3 levels and/or high TSH levels.

Likewise, nonagenarians from families with exceptional long lifespans, as well as their descendants, have been reported to exhibit increased TSH levels and/or decreased circulating T3 levels.

The Martin-Montalvo research team concluded, “In 1908 Dr. Max Rubner proposed the rate of living theory of aging and longevity, postulating that species with a low metabolic rate would have increased life expectancy when compared to species with a higher metabolic rate.

In this line, restricted levels of THs, which control the metabolic rate, have been associated with increased longevity as well as metabolic fitness.”

###

Full Text – https://www.aging-us.com/article/102285/text

Correspondence to: Alejandro Martin-Montalvo; email: [email protected] and Benoit Raymond Gauthier; email: [email protected]

Keywords: lifespan, healthspan, thyroid hormones, hyperthyroidism, hypothyroidism, glucose metabolism

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Original Source

https://www.aging-us.com/news_room/inadequate-control-of-thyroid-hormones-sensitizes-to-hepatocarcinogenesis-and-unhealthy-aging

Related Journal Article

http://dx.doi.org/10.18632/aging.102285

Tags: AgingGerontologyMedicine/Health
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