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Study shows how to prevent a high-fat diet from throwing metabolism out of whack

Biologists discover removing a protein inhibitor restores metabolic balance

Date:
April 5, 2023
Source:
University of California - Irvine
Summary:
Eating lots of fats increases the risk of metabolic disorders, but the mechanisms behind the problem have not been well understood. Now, biologists have made a key finding about how to ward off harmful effects caused by a high-fat diet.
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Eating lots of fats increases the risk of metabolic disorders, but the mechanisms behind the problem have not been well understood. Now, University of California, Irvine biologists have made a key finding about how to ward off harmful effects caused by a high-fat diet. Their study appears in Nature Communications.

The UC Irvine research centered on a protein complex called AMPK, which senses the body's nutrition and takes action to keep it balanced. For example, if AMPK detects that glucose is low, it can boost lipid breakdown to produce energy in its place. Scientists have known that consuming high amounts of fat blocks AMPK's activity, leading the metabolism to go out of balance. However, until now, how cells block this mechanism has not been widely examined, especially in live models.

The UCI biologists decided to investigate, believing an AMPK component called SAPS3 serves a significant role. They eliminated SAPS3 from the genome of a group of mice and fed them meals with a 45 percent fat content. The results were startling even to the research team.

"Removing the SAPS3-inhibiting component freed the AMPK in these mice to activate, allowing them to maintain a normal energy balance despite eating a large amount of fat," said Mei Kong, professor of molecular biology & biochemistry and the study's corresponding author. "We were surprised by how well they maintained normal weight, avoiding obesity and development of diabetes."

The discovery could eventually lead to a new way to approach metabolism-related conditions. "If we block this inhibition activity, we could help people reactivate their AMPK," said first author Ying Yang, a project scientist in the Kong lab. "It could help in overcoming disorders such as obesity, diabetes, fatty liver disease and others. It's important to recognize how important normal metabolic function is for every aspect of the body."

The researchers are working on developing molecules that could inhibit SAPS3 and restore the metabolism's balance. They plan to next study SAPS3's role in other conditions with disturbed metabolic systems, such as cancer and aging.

The discovery comes as metabolic-related diseases such as obesity and diabetes continue to rise. More than half of the global population is expected to be overweight or obese by 2035, compared to 38 percent in 2020, according to the World Obesity Federation. The number of people worldwide with diabetes is expected to rise to 578 million by 2030, up 25 percent from 2019, according to a recent study (Diabetes Research and Clinical Practice, 2019).

Support for the project was provided by the National Institutes of Health and the American Cancer Society.


Story Source:

Materials provided by University of California - Irvine. Note: Content may be edited for style and length.


Journal References:

  1. Ying Yang, Michael A. Reid, Eric A. Hanse, Haiqing Li, Yuanding Li, Bryan I. Ruiz, Qi Fan, Mei Kong. SAPS3 subunit of protein phosphatase 6 is an AMPK inhibitor and controls metabolic homeostasis upon dietary challenge in male mice. Nature Communications, 2023; 14 (1) DOI: 10.1038/s41467-023-36809-1
  2. Pouya Saeedi, Inga Petersohn, Paraskevi Salpea, Belma Malanda, Suvi Karuranga, Nigel Unwin, Stephen Colagiuri, Leonor Guariguata, Ayesha A. Motala, Katherine Ogurtsova, Jonathan E. Shaw, Dominic Bright, Rhys Williams. Global and regional diabetes prevalence estimates for 2019 and projections for 2030 and 2045: Results from the International Diabetes Federation Diabetes Atlas, 9th edition. Diabetes Research and Clinical Practice, 2019; 157: 107843 DOI: 10.1016/j.diabres.2019.107843

Cite This Page:

University of California - Irvine. "Study shows how to prevent a high-fat diet from throwing metabolism out of whack." ScienceDaily. ScienceDaily, 5 April 2023. <www.sciencedaily.com/releases/2023/04/230405161412.htm>.
University of California - Irvine. (2023, April 5). Study shows how to prevent a high-fat diet from throwing metabolism out of whack. ScienceDaily. Retrieved April 11, 2024 from www.sciencedaily.com/releases/2023/04/230405161412.htm
University of California - Irvine. "Study shows how to prevent a high-fat diet from throwing metabolism out of whack." ScienceDaily. www.sciencedaily.com/releases/2023/04/230405161412.htm (accessed April 11, 2024).

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