Related Experiment Video
Updated: Jul 3, 2025
08:52
Measurement of Protein Turnover Rates in Senescent and Non-Dividing Cultured Cells with Metabolic Labeling and Mass Spectrometry
Published on: April 6, 2022
3.5K
Proline restores mitochondrial function and reverses aging hallmarks in senescent cells.
Debanik Choudhury1, Na Rong1, Hamsa Vardini Senthil Kumar2
1Department of Chemical and Biological Engineering, University at Buffalo, Buffalo, NY 14260, USA.
Cell Reports
|February 14, 2024
Summary
This study reveals proline supplementation rejuvenates senescent cells by restoring mitochondrial function and enhancing mitophagy. Proline treatment reverses key aging hallmarks, offering potential therapeutic benefits for age-related decline.
Area of Science:
- Cellular senescence and aging research
- Mitochondrial biology and metabolism
- Stem cell biology
Background:
- Mitochondrial dysfunction is a key feature of cellular senescence, contributing to functional decline.
- The pluripotency transcription factor NANOG has been shown to rejuvenate senescent cells by altering metabolic pathways.
Purpose of the Study:
- To investigate the role of proline biosynthesis in NANOG-mediated mitochondrial rejuvenation.
- To explore the effects of proline supplementation on senescent mesenchymal stem cells and aging hallmarks.
Main Methods:
- Investigated NANOG's effect on proline biosynthesis enzymes (PYCR1, PYCR2).
- Assessed proline supplementation's impact on mitochondrial respiration in senescent cells.
- Examined proline's role in mitophagy induction via AMPKα and Parkin.
- Evaluated proline's effects on various aging markers.
Main Results:
- NANOG restores PYCR1 and PYCR2 expression in senescent cells.
- Proline supplementation alleviates mitochondrial respiratory impairment in senescent mesenchymal stem cells.
- Proline induces mitophagy by activating AMPKα and upregulating Parkin.
- Proline treatment reduces DNA damage, senescence markers, inflammation, and improves differentiation.
Conclusions:
- Proline plays a crucial role in mitophagy and reversing senescence-associated mitochondrial dysfunction.
- Proline supplementation demonstrates potential in mitigating multiple aging hallmarks.
- This study identifies proline as a promising therapeutic agent for age-related cellular dysfunction.
Related Concept Videos
01:37Mitochondria
12.6K
Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
12.6K
01:46Electron Transport Chain: Complex I and II
13.3K
The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
ROS generation is regulated and maintained at moderate levels necessary...
13.3K
02:15Replicative Cell Senescence
3.6K
Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...
3.6K
01:19Translocation of Proteins into the Mitochondria
3.1K
Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
3.1K
02:23Abnormal Proliferation
4.5K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
4.5K
01:45Mitochondrial Membranes
10.3K
A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
10.3K