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How do intestinal stem cells maintain the lining of the intestines?
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stem cell
Stem cells of neural and hematopoietic origin have tremendous potential in the development of therapies for certain diseases, such as diabetes and Parkinson disease. Neural stem cells occur in the spinal cord and in specific regions of the brain, and hematopoietic stem cells occur in the blood and bone marrow.
Intestinal stem cells maintain the lining of the small intestine through a process of continuous cellular turnover. These stem cells are located near the base of small pits known as crypts, which are interspersed between the villi of the intestinal epithelium.12
The maintenance process functions as follows:
- Production: Stem cells reside in specialized niches that provide the necessary substances to keep them active. They continuously produce new cells within the crypts.12
- Migration and Differentiation: As these new cells migrate from the crypts onto the villi, they undergo differentiation into the specific cell types required for the intestinal lining.2
- Turnover: The mature cells eventually reach the end of their lifespan, at which point they are shed into the lumen of the intestine, ensuring the lining is constantly renewed.2
This system relies on a population of "transit amplifying cells," which arise from the stem cells and divide a finite number of times before fully differentiating.1