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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.
Cellular Clock Theory
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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Regulation of Hematopoietic Stem Cells01:01

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All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
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The Effect of Aging on Tissues01:19

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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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Inflammation01:38

Inflammation

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Overview
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Inflammatory Response01:28

Inflammatory Response

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An inflammatory response is a localized, nonspecific immune reaction that occurs when a tissue is injured. It is characterized by redness, swelling, heat, and pain, which are commonly called the cardinal signs and symptoms of inflammation. Inflammation can sometimes result in a loss of function.
Inflammation can be triggered by various stimuli, such as impact, abrasion, chemical irritation, infections, and extreme hot or cold temperatures. These can damage cells and connective tissue fibers,...
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Isolation and Characterization of the Immune Cells from Micro-dissected Mouse Choroid Plexuses
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Inflammation, Stem Cells, and the Aging Hypothalamus.

Andrew R Mendelsohn1,2, James W Larrick1,2

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The aging hypothalamus influences vertebrate aging. Interventions targeting microglial inflammation and maintaining neural stem cell (NSC) viability may extend health and lifespan.

Keywords:
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Area of Science:

  • Neuroscience
  • Gerontology
  • Stem Cell Biology

Background:

  • The hypothalamus plays a critical role in vertebrate aging.
  • Aging is associated with increased microglial inflammation, reducing hypothalamic neural stem cells (NSCs).

Purpose of the Study:

  • To investigate the role of hypothalamic NSCs and microglial inflammation in aging.
  • To explore therapeutic strategies for extending healthspan and lifespan.

Main Methods:

  • Investigated the effects of SIRT1 and NF-κB inhibition in mouse models.
  • Examined the function of hypothalamic NSCs and their secreted factors.

Main Results:

  • SIRT1 and NF-κB inhibition in microglia or NSCs extended lifespan in mice.
  • Hypothalamic NSCs secrete exosomes and GnRH, counteracting aging-related dysfunction.
  • Stem cells act as active physiological effectors, not just precursors.

Conclusions:

  • Targeting microglial inflammation and promoting NSC viability are promising strategies for enhancing healthspan and lifespan.
  • Hypothalamic stem cells have a significant role in regulating aging processes.