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Cell Type-specific Gene Expression Profiling in the Mouse Liver
Published on: September 17, 2019
Long-living Ames dwarf mouse hepatocytes readily undergo apoptosis
Melissa A Kennedy1, Sharlene G Rakoczy, Holly M Brown-Borg
1Department of Pharmacology, Physiology, and Therapeutics, University of North Dakota School of Medicine and Health Sciences, 501 N Columbia Road, Grand Forks, ND 58203, USA.
Experimental Gerontology
|September 5, 2003
Summary
Ames dwarf mice exhibit enhanced apoptosis when facing oxidative stress, efficiently clearing damaged cells. This programmed cell death mechanism contributes to their significantly longer lifespan compared to wild-type mice.
Area of Science:
- Aging and Longevity Research
- Cellular Biology
- Apoptosis Mechanisms
Background:
- Ames dwarf mice demonstrate extended lifespan (50-64%) with improved antioxidative defenses and reduced cellular damage.
- Aging is closely linked to apoptosis, the process of programmed cell death.
- Understanding apoptosis regulation is crucial for longevity research.
Purpose of the Study:
- To compare basal levels of apoptosis-related proteins in Ames dwarf and wild-type mouse tissues.
- To investigate the differential response of primary hepatocytes from dwarf and wild-type mice to oxidative stress.
Main Methods:
- Isolation of primary hepatocytes from 6-month-old dwarf and wild-type mice via collagenase perfusion.
- Treatment of isolated hepatocytes with hydrogen peroxide to induce oxidative stress.
- Evaluation of cell viability, caspase-3 activity, protein levels (procaspase-3, Bcl-2, Bax), and morphological changes.
Main Results:
- Increased procaspase-3 levels in dwarf mouse kidney and liver; higher Bcl-2 in dwarf liver at 24 months.
- Elevated Bax levels and lower Bcl-2/Bax ratios observed in various dwarf tissues.
- Dwarf hepatocytes exhibited reduced viability and increased caspase-3 activity under oxidative stress, with morphological signs of apoptosis.
Conclusions:
- Ames dwarf hepatocytes undergo apoptosis more readily than wild-type cells when exposed to oxidative challenges.
- This enhanced apoptotic response facilitates efficient elimination of damaged cells in dwarf mice.
- The accelerated apoptosis pathway is a key factor contributing to the extended longevity observed in Ames dwarf mice.
