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Related Concept Videos

Aging01:26

Aging

801
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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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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Changes in the Appendicular Skeleton with Age01:09

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The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
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Pharmacodynamics in Geriatric Patients: Effects of Age01:27

Pharmacodynamics in Geriatric Patients: Effects of Age

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Age-related pharmacokinetic changes are extensively documented, but understanding age-related pharmacodynamic alterations is relatively limited. This knowledge gap can be partly attributed to the complexity of developing appropriate measures of drug responses compared to bioanalytical methods for determining drug concentrations.Most information regarding age-related differences in human pharmacodynamics originates from cross-sectional studies. However, these studies assume that observed mean...
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Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption01:22

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption

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As individuals age, their body's physiology evolves, affecting drug pharmacokinetics. The most apparent changes occur in the gastrointestinal tract, where an increase in gastric pH, a delay in gastric emptying, and a reduction in gastrointestinal motility are observed. Remarkably, these changes do not substantially modify the absorption of orally administered drugs, particularly those absorbed via passive diffusion.Transdermal drug delivery emerges as a highly viable method for older adults due...
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Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution01:00

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution

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Drug distribution in the human body is influenced by several factors, including plasma protein concentration, body composition, blood flow, tissue-protein concentration, and tissue fluid pH. Among these, changes in plasma protein concentration and body composition due to aging significantly affect how drugs are distributed within the body. Specifically, aging is associated with a decrease in albumin levels by about 10% and an increase in α1-acid glycoprotein levels. These alterations are...
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Related Experiment Video

Updated: Feb 11, 2026

Minimizing Hypoxia in Hippocampal Slices from Adult and Aging Mice
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Minimizing Hypoxia in Hippocampal Slices from Adult and Aging Mice

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Dwarf Mice and Aging.

Michal M Masternak1, Justin Darcy2, Berta Victoria3

  • 1University of Central Florida, Orlando, FL, United States; The Greater Poland Cancer Centre, Poznan, Poland.

Progress in Molecular Biology and Translational Science
|April 15, 2018
PubMed
Summary
This summary is machine-generated.

Studies on Ames, Snell, and GHR-KO dwarf mice reveal extended longevity and health span. Reduced growth hormone (GH) action in these models offers insights into aging mechanisms and potential interventions.

Keywords:
Ames dwarfGHR-KOagingdwarfgrowth hormone

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Area of Science:

  • Aging research
  • Endocrinology
  • Genetics

Background:

  • Dwarf mice, including Ames (Prop1df), Snell (Pit1dw), and growth hormone receptor knockout (GHR-KO), have long been studied.
  • Ames dwarf mice were first identified as exceptionally long-lived in 1996.
  • Subsequent research demonstrated extended longevity in Snell dwarf and GHR-KO mice, linked to growth hormone (GH) deficiency or resistance.

Purpose of the Study:

  • To review recent studies on dwarf mice focusing on aging mechanisms.
  • To explore the connection between reduced GH action and extended health span.
  • To identify novel pathways linking GH signaling to longevity.

Main Methods:

  • Analysis of brown and white adipose tissue biology in dwarf mice.
  • MicroRNA (miRNA) profiling to identify regulatory changes.
  • Investigation of early-life dietary and hormonal interventions.

Main Results:

  • Reduced GH action is associated with extended life span and health span in dwarf mice.
  • Studies reveal specific mechanisms in adipose tissue and miRNA profiles linked to longevity.
  • Early-life interventions modulate aging pathways in these models.

Conclusions:

  • Dwarf mouse models provide valuable insights into the biological mechanisms of aging.
  • Reduced GH signaling is a key factor in extending both lifespan and health span.
  • Further research in these models may uncover novel therapeutic targets for age-related diseases.