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Related Concept Videos

Aging01:26

Aging

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 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...
Pharmacodynamics in Geriatric Patients: Effects of Age01:27

Pharmacodynamics in Geriatric Patients: Effects of Age

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...
Signal Transduction: Overview01:26

Signal Transduction: Overview

Cells respond to many types of information, often through receptor proteins positioned on the membrane. They respond to chemical signals, such as hormones, neurotransmitters, and other signaling molecules, initiating a series of molecular reactions to produce an appropriate response. This is called signal transduction. Cells also coordinate different responses elicited by the same signaling molecule via mediators, allowing molecular cross-talk.
Typically, signal transduction involves three...
Mitochondria01:37

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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
Replicative Cell Senescence02:15

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Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds the telomeric...

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Related Experiment Video

Updated: Jul 3, 2026

Measurement of Protein Turnover Rates in Senescent and Non-Dividing Cultured Cells with Metabolic Labeling and Mass Spectrometry
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Measurement of Protein Turnover Rates in Senescent and Non-Dividing Cultured Cells with Metabolic Labeling and Mass Spectrometry

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Signal transduction in aging.

M Sugawa, T May

    Archives of Gerontology and Geriatrics
    |January 1, 1994
    PubMed
    Summary
    This summary is machine-generated.

    Aging in rats affects brain signal pathways. Older rats show altered phosphatidylinositol signaling and reduced dopamine receptor density, while adenylate cyclase activity declines with age.

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    Area of Science:

    • Neuroscience
    • Biochemistry
    • Aging Research

    Background:

    • Signal transduction pathways are crucial for central nervous system (CNS) function.
    • Age-related changes in these pathways can impact neuronal function and contribute to cognitive decline.
    • Dopamine (DA) receptors (D1 and D2) play significant roles in striatal function and are implicated in aging processes.

    Purpose of the Study:

    • To investigate age-related alterations in phosphatidylinositol (PI) and adenosine 3':5'-cyclic monophosphate (cAMP) signal transduction pathways in the rat CNS.
    • To examine the impact of aging on dopamine D1 and D2 receptor density and affinity in the rat striatum.
    • To determine the relationship between dopamine stimulation, adenylate cyclase activity, and aging.

    Main Methods:

    • Measurement of phospholipase-C (PL-C) activity and inositol (1,4,5)trisphosphate (Ins(1,4,5)P3) concentration in striatal tissue from young and aged rats.
    • Assay of endogenous cAMP levels and adenylate cyclase (AC) activity in young versus aged rat striata.
    • Dopamine receptor binding studies using [(3)H]SCH 23390 (D1) and [(3)H]spiperone (D2) to determine receptor affinity (Kd) and density (Bmax).

    Main Results:

    • Aged rats exhibited significantly higher PL-C activity and Ins(1,4,5)P3 levels in the corpus striatum compared to young rats.
    • Striatal tissue from young rats showed higher endogenous cAMP levels and AC activity than aged rats.
    • Aged rats displayed a significant decrease in the density (Bmax) of both D1 and D2 receptors in the striatum, with no change in affinity (Kd).
    • Dopamine-stimulated AC activity was significantly reduced in aged rats, independent of Gs and Gi activity changes.

    Conclusions:

    • Aging alters key signal transduction pathways in the rat CNS, specifically affecting PI and cAMP cascades.
    • Age-related changes include increased PI turnover, decreased cAMP signaling, and reduced dopamine receptor density in the striatum.
    • These findings suggest significant neurochemical adaptations in the aging rat brain, potentially contributing to functional decline.