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Related Concept Videos

The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

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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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Tissue Renewal without Stem Cells01:23

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After cellular or tissue damage, the resident stem cells present in the human body can locally repair and regenerate the damaged tissue or organ. However, even though some tissues do not have stem cells, they can repair and regenerate with the help of pre-existing cells. For example, beta cells of the pancreas and hepatocytes of the liver can divide to renew and regenerate the tissue. Here, both cell division and cell death are well regulated by homeostasis.
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Whole Body Regeneration01:33

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Regeneration is the process of restoring injured or lost tissues, organs, or body parts. While simpler organisms generally show greater ability to regenerate their whole body, few complex animals show similarly exceptional regeneration. For example, planarian flatworms have a unique regenerative potential making them a popular study organism among biologists to understand the mechanisms of whole body regeneration. Other organisms, such as hydra, also show extreme regeneration potential;...
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The skin is divided into epidermis, dermis, and hypodermis, the skin's outermost, middle, and inner layers. The human epidermal layer regularly undergoes renewal, where old, dead cells are replaced by new cells. Epidermal stem cells or EpiSCs divide and differentiate to restore the lost cells. For the renewal process, some EpiSCs continuously self-renew. In contrast, few others differentiate into transit-amplifying cells, which later form prickle or spinous cells, followed by granular...
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Aging01:26

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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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Regeneration and repair processes are critical in healing damages caused by injury, disease, and aging. In regeneration, the damaged tissue is entirely replaced with new growth that restores the original architecture and function. In contrast, tissue repair usually results in a fixed tissue architecture involving scar formation. Scars generally do not reestablish tissue function and may also exhibit structural abnormalities at the injury site.
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Replacement-Based Ageing Interventions for Systemic Rejuvenation: Shaping Longevity Science and Clinical Directions.

Bjorn Fraser Olaisen1, Vadim N Gladyshev2,3, Bohan Zhang2

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Aging Cell
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This summary is machine-generated.

Biological replacement therapies offer a promising avenue to reverse age-related damage and extend healthy lifespan. Research is advancing replacement strategies and bioengineering for systemic rejuvenation and improved healthspan.

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Area of Science:

  • Gerontology and regenerative medicine
  • Biotechnology and bioengineering
  • Molecular and cellular biology

Background:

  • Aging interventions using biological and synthetic replacements can reverse age-related damage.
  • These approaches hold potential for extending healthy lifespan beyond conventional therapies.
  • Multi-targeted damage removal at molecular, organellar, and cellular levels is a key focus.

Purpose of the Study:

  • To discuss recent insights, unmet needs, and emerging trajectories in replacement-based aging interventions.
  • To prioritize challenges, opportunities, and future directions for preventive replacement and bioengineering.
  • To propose a roadmap for integrating replacement and damage-removal therapeutics for whole-body rejuvenation.

Main Methods:

  • Perspective review of current research and clinical development in replacement-based aging interventions.
  • Discussion of insights from the first workshop on replacement as an aging intervention at the Aging Research & Drug Discovery 2025 conference.
  • Identification of key challenges and opportunities for advancing the field.

Main Results:

  • Replacement-based interventions show potential for simultaneous reversal of multiple age-related damages.
  • Bioengineering technologies are crucial for inducing systemic and sustained rejuvenation.
  • Synergistic strategies combining replacement and damage-removal are emerging.

Conclusions:

  • A roadmap is proposed to guide research and innovation in replacement-based aging therapies.
  • Integration of replacement and next-generation damage-removal therapeutics can modulate aging.
  • These strategies aim to restore biological function and extend healthy lifespan.