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The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

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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In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...

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Related Experiment Video

Updated: Jul 13, 2026

Assessment of Vascular Regeneration in the CNS Using the Mouse Retina
07:32

Assessment of Vascular Regeneration in the CNS Using the Mouse Retina

Published on: June 23, 2014

Age-related BM-MNC dysfunction hampers neovascularization.

Shinobu Sugihara1, Yasutaka Yamamoto, Takashi Matsuura

  • 1Division of Regenerative Medicine and Therapeutics, Department of Genetic Medicine and Regenerative Therapeutics, Tottori University Graduate School of Medical Science, Japan.

Mechanisms of Ageing and Development
|August 11, 2007
PubMed
Summary

Aging impairs the neovascularization capacity of bone marrow mononuclear cells (BM-MNCs). Young BM-MNCs improved blood flow in aged mice, but aged BM-MNCs did not, indicating age-related functional decline.

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Area of Science:

  • Regenerative Medicine
  • Vascular Biology
  • Aging Research

Background:

  • Ischemia-induced neovascularization is crucial for tissue repair but declines with age.
  • The impact of aged bone marrow mononuclear cells (BM-MNCs) on neovascularization remains largely uninvestigated.

Purpose of the Study:

  • To compare the neovascularization capacity of young and aged BM-MNCs.
  • To assess the therapeutic potential of young BM-MNCs in aged recipients with ischemic limbs.

Main Methods:

  • In vivo and in vitro assessment of BM-MNCs from young (8-week-old) and old (18-month-old) mice.
  • Evaluation of blood perfusion, capillary density, and vascular endothelial growth factor (VEGF) production.
  • Analysis of cell populations including Dil/lectin, AC133, CD34, and VEGF-R2 positive cells.

Main Results:

  • Neovascularization was significantly impaired in old mice.
  • Transplantation of young BM-MNCs enhanced blood perfusion, capillary density, and VEGF production in ischemic limbs of old mice.
  • Aged BM-MNCs exhibited impaired in vitro VEGF production and migratory capacity.

Conclusions:

  • The neovascularization potential of transplanted BM-MNCs is diminished by aging.
  • Aging does not prevent the host's ability to benefit from young BM-MNCs for neovascularization.