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Mitochondria

Mitochondria

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,...

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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.
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Mitochondrial Membranes

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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,...

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The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria. In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...

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Imaging and Quantifying Mitochondrial Morphology in C. elegans During Aging

Imaging and Quantifying Mitochondrial Morphology in C. elegans During Aging

Published on: January 17, 2025

Enhancing healthy aging with small molecules: A mitochondrial perspective.

Xiujiao Qin¹, Hongyuan Li², Huiying Zhao¹

¹Department of Geriatrics, the First Hospital of Jilin University, Changchun, Jilin, China.

Medicinal Research Reviews

|March 14, 2024

Summary

Small molecules can support healthy aging by improving mitochondrial function. Interventions targeting mitochondrial damage, proteostasis, energy production, and biogenesis offer promising strategies to combat age-related decline.

Keywords:

aging mitochondrial mitophagy redox homeostasis unfolded protein response

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Area of Science:

Gerontology
Mitochondrial Biology
Pharmacology

Background:

Aging is characterized by a decline in cellular function, particularly mitochondrial dysfunction.
Mitochondrial health is critical for overall healthspan and is impacted by oxidative damage, impaired proteostasis, and reduced energy production.

Purpose of the Study:

To review the role of small molecules in promoting healthy aging by targeting mitochondrial functions.
To explore interventions that mitigate age-related mitochondrial dysfunction.

Main Methods:

Literature review of studies on small molecules and their effects on mitochondrial health during aging.
Categorization of interventions based on their mechanisms: reducing oxidative damage, enhancing proteostasis, modulating energy production, and promoting biogenesis.

Main Results:

Small molecules like coenzyme Q10, alpha-lipoic acid, and antioxidants can reduce mitochondrial oxidative damage.
Agents such as doxycycline, urolithin A, spermidine, trehalose, and taurine improve mitochondrial proteostasis and mitophagy.
Nicotinamide adenine dinucleotide boosters, metformin, and other compounds enhance mitochondrial energy production and metabolic function.

Conclusions:

Small molecule interventions offer a promising strategy to counteract age-related mitochondrial degradation.
Targeting mitochondrial pathways with specific compounds can support healthy aging and potentially lead to new therapeutic approaches.