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PPARγ Maintains Homeostasis through Autophagy Regulation in Dental Pulp
1Department of Oral Biochemistry, Institute of Oral Bioscience, School of Dentistry, Chonbuk National University, Jeonju, Korea.
Journal of Dental Research
|March 7, 2015
Summary
Peroxisome proliferator-activated receptor gamma (PPARγ) maintains dental pulp homeostasis by regulating autophagy in aged human dental pulp cells (HDPCs). This involves influencing autophagy molecules, mitochondrial activity, and cell viability during aging.
Area of Science:
- Dental Pulp Biology
- Cellular Aging
- Molecular Mechanisms
Background:
- Pulp vitality declines with age, impacting homeostasis.
- Autophagy plays a role in cellular aging.
- The role of peroxisome proliferator-activated receptor gamma (PPARγ) in aged dental pulp cells is unclear.
Purpose of the Study:
- To investigate the link between pulp vitality and autophagy in aged human dental pulp cells (HDPCs).
- To determine if PPARγ influences autophagy regulation for homeostasis during aging.
Main Methods:
- In vivo analysis of human and rat teeth.
- In vitro aging of HDPCs with PPARγ overexpression.
- Assessment of autophagy molecules, mitochondrial activity, and cell viability using Western blotting, confocal microscopy, and MTT assay.
Main Results:
- Aged HDPCs showed increased autophagy but decreased PPARγ and heme oxygenase 1 (HO-1).
- PPARγ overexpression in aged cells induced HO-1 and autophagy, reduced inflammation, and enhanced mitochondrial activity and viability.
- HO-1 inhibition exacerbated autophagy and mitochondrial activity in young cells.
Conclusions:
- PPARγ is crucial for maintaining dental pulp homeostasis.
- PPARγ regulates autophagy molecules, mitochondrial function, and cell viability in aging HDPCs.
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