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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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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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Clinically Relevant Drug Product Specifications: Methods of Establishment01:29

Clinically Relevant Drug Product Specifications: Methods of Establishment

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Product specifications define the acceptable quality of a pharmaceutical product by ensuring identity, purity, potency, and strength. These specifications serve as benchmarks during development, manufacturing, and post-approval quality control. Clinically relevant specifications are particularly important because they directly relate to a drug's safety and efficacy in clinical use.Dissolution studies are critical biopharmaceutic tools that link in vitro behavior to in vivo performance. They...
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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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Commentary on Some Recent Theses Relevant to Combating Aging: December 2018.

Benjamin Zealley, Aubrey D N J de Grey

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    This review covers advancements in biomaterials for vascular grafts, the role of actomyosin in adipocyte thermogenesis, and age-related changes in mouse immune cells. It also explores intercellular endoplasmic reticulum stress, early tumor angiogenesis detection, and amyloid-beta interactions with microglial cells.

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    Area of Science:

    • Biomaterials Science
    • Cellular Biology
    • Immunology
    • Neuroscience
    • Medical Imaging
    • Neurodegeneration

    Background:

    • Recent research highlights novel biomaterial modifications for improved vascular grafts.
    • Understanding cellular mechanisms in thermogenesis and immune aging is crucial.
    • Investigating intercellular communication in the central nervous system and early tumor detection methods are key areas of study.

    Purpose of the Study:

    • To review cutting-edge theses in vascular graft biomaterials.
    • To explore the role of actomyosin-mediated tension in adipocyte function.
    • To examine age-associated alterations in the intrathymic B cell population in mice.
    • To investigate the transmissibility of endoplasmic reticulum stress in the central nervous system.
    • To evaluate early tumor angiogenesis using advanced ultrasound techniques.
    • To elucidate interactions between amyloid-beta and microglial cells in neurological contexts.

    Main Methods:

    • Cell-derived biomaterial modification.
    • Analysis of actomyosin-mediated tension and thermogenic programs.
    • Flow cytometry and immunological assays for B cell populations.
    • In vitro and in vivo models of endoplasmic reticulum stress.
    • Ultrasound acoustic angiography for angiogenesis imaging.
    • Biochemical and cellular assays for amyloid-beta and microglial interactions.

    Main Results:

    • Development of thromboresistant cell-derived biomaterials for vascular grafts.
    • Actomyosin tension is shown to orchestrate thermogenic programs in adipocytes.
    • Significant age-associated changes observed in intrathymic B cell populations in mice.
    • Endoplasmic reticulum stress demonstrated transmissibility among central nervous system cells.
    • Ultrasound acoustic angiography proves effective for early tumor angiogenesis evaluation.
    • Detailed insights into interactions between amyloid-beta and microglial cells.

    Conclusions:

    • Cell-derived biomaterials offer promising avenues for vascular graft development.
    • Actomyosin dynamics play a critical role in regulating energy metabolism in adipocytes.
    • Aging impacts the immune system through alterations in B cell development.
    • Intercellular stress signaling is a fundamental process in the central nervous system.
    • Advanced imaging techniques enhance early cancer detection capabilities.
    • Understanding these interactions is vital for developing therapies for neurodegenerative diseases.