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Age changes in stem cells of murine small intestinal crypts
K Martin1, T B Kirkwood, C S Potten
1Department of Geriatric Medicine and School of Biological Sciences, University of Manchester, 3.239 Stopford Building, Oxford Road, Manchester, M13 9PT, United Kingdom.
Experimental Cell Research
|June 25, 1998
Summary
Aging affects stem cells, impacting tissue maintenance. Older mice showed increased stem cell apoptosis after low-dose radiation, suggesting age-related functional decline in these critical cells.
Area of Science:
- Gerontology
- Stem Cell Biology
- Gastroenterology
Background:
- Cell senescence is well-documented in differentiated cells, but age-related changes in stem cells remain less understood.
- Stem cell decline with age can lead to tissue dysfunction and loss of proliferative homeostasis.
- Murine small intestine stem cells offer a defined model to study aging effects due to their specific location.
Purpose of the Study:
- To investigate age-related alterations in murine small intestine stem cells.
- To examine the impact of aging on stem cell apoptosis in response to irradiation.
Main Methods:
- Histological examination of small intestines from mice aged 5 to 32 months.
- Assessment of stem cell apoptosis following exposure to 1 Gy or 8 Gy gamma irradiation in different age groups (5, 15, 18, and 29 months).
Main Results:
- Age-related histological changes were observed in the small intestine.
- A twofold increase in stem cell apoptosis was noted in 29-month-old mice compared to younger groups after 1 Gy irradiation.
- The age-related difference in apoptosis was less pronounced after 8 Gy irradiation.
Conclusions:
- Murine small intestine stem cells exhibit functional alterations with age.
- Increased susceptibility to apoptosis at low radiation doses suggests compromised stem cell integrity in aged mice.
- These findings highlight the importance of stem cell aging in tissue maintenance and overall aging processes.