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Related Concept Videos

Aging01:26

Aging

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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
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The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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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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Overview of Protein Metabolism01:21

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Proteins are broken down into amino acids during digestion. Unlike fats and carbohydrates, which are stored for later use, proteins are not. Instead, amino acids are either used to produce ATP through oxidation or contribute to the creation of new proteins for the growth and repair of the body. Any surplus amino acids from the diet are converted into glucose or triglycerides rather than excreted.
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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
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It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
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Related Experiment Video

Updated: Jun 26, 2025

Assessing Lysosomal Alkalinization in the Intestine of Live Caenorhabditis elegans
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Amino acid restriction, aging, and longevity: an update.

S N Austad1, J R Smith1, J M Hoffman2

  • 1Department of Biology, University of Alabama at Birmingham, Birmingham, AL, United States.

Frontiers in Aging
|May 17, 2024
PubMed
Summary

Dietary restriction, including amino acid restriction, shows health and longevity benefits in animal models. Further research is needed to confirm these benefits in realistic environments and with other interventions.

Keywords:
amino acid restrictiondietfood restrictionlongevityprotein restriction

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Area of Science:

  • Gerontology
  • Nutritional Science
  • Animal Models

Background:

  • Dietary restriction paradigms show promise for extending health and lifespan.
  • Most studies use ad libitum feeding, which is not ideal for long-term health studies.
  • Various dietary manipulations, including calorie and amino acid restriction, demonstrate health benefits in laboratory species.

Purpose of the Study:

  • To review the current state of amino acid restriction research on animal model longevity.
  • To evaluate the translational potential of amino acid restriction for human health.
  • To understand how amino acid restriction interacts with other health-enhancing treatments.

Main Methods:

  • Review of existing literature on dietary restriction and amino acid manipulation in animal models.
  • Analysis of studies comparing ad libitum feeding to various dietary restriction paradigms.
  • Evaluation of health benefits across different laboratory species.

Main Results:

  • Amino acid restriction, including methionine and branched-chain amino acids, confers health benefits compared to ad libitum feeding.
  • These benefits have been observed in standard laboratory environments.
  • Mechanisms underlying these benefits are not yet fully understood.

Conclusions:

  • Amino acid restriction is a promising area for promoting longevity and healthspan.
  • Further investigation is required to validate these findings in more realistic settings.
  • Understanding interactions with exercise and geroprotective drugs is crucial for translational potential.