Nutrients Direct Intestinal Stem Cell Function and Affect Aging

The capacity of intestinal stem cells to maintain cellular balance in the gut decreases upon ageing. Researchers at the University of Helsinki have discovered a new mechanism of action between the nutrient adaptation of intestinal stem cells and ageing. The finding may make a difference when seeking ways to maintain the functional capacity of the ageing gut.

The cellular balance of the intestine is carefully regulated, and it is influenced, among other things, by nutrition: ample nutrition increases the total number of cells in the gut, whereas fasting decreases their number.

The relative number of different types of cells also changes according to nutrient status.

The questions of how the nutrition status of the gut controls stem cell division and differentiation, and how the nutrient adaptation of stem cells changes as during ageing have not been comprehensively answered.

Nutrient adaptation refers to the way in which nutrients guide cell function.

Researchers at the University of Helsinki identified a new regulatory mechanism that directs the differentiation of intestinal stem cells under a changing nutrient conditions.

Cell signalling activated by nutrients increases the size of stem cells in the fruit fly intestine. The size of the stem cells, in turn, controls the cell type into which the stem cells differentiate. 

For stem cell function, flexible regulation of their size is essential. In other words, the size of the cells dynamically increases or decreases, depending on the dietary conditions. Such flexibility enables stem cells to differentiate in accordance with the prevailing nutrient status.

By utilising intestine-wide cell imaging, the researchers found that the nutrient adaptation of stem cell size and the resulting differentiation vary in different regions of the gut.

The researchers also observed that the ability of intestinal stem cells to react to a changing nutrient status is greatly reduced in older animals. They also found that, in older animals, stem cells are in a state where they are constantly large in size, which restricts their ability to differentiate.

With ageing, flexible regulation of stem cell size was markedly better preserved in animals that had been kept under diet regime that is known as intermittent fasting.

In the past, intermittent fasting has been shown to prolong the lifespan of animals, and the results now obtained indicate that the improved preservation of stem cell function may underlie this prolongation.

According to the researchers, the mechanisms associated with the functioning, nutrient adaptation and ageing of human and fruit fly stem cells are fairly similar.

Sources:

Jaakko Mattila, Arto Viitanen, Gaia Fabris, Tetiana Strutynska, Jerome Korzelius, Ville Hietakangas. Stem cell mTOR signaling directs region-specific cell fate decisions during intestinal nutrient adaptation. Science Advances, 2024; 10 (6) DOI: 10.1126/sciadv.adi2671

University of Helsinki. (2024, February 12). Nutrients direct intestinal stem cell function and affect aging. ScienceDaily. Retrieved February 13, 2024 from www.sciencedaily.com/releases/2024/02/240212171308.htm

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