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Related Concept Videos

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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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
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Menopause, a natural biological process marking the end of a woman's fertility, typically occurs between the fifth and sixth decade of life. This phase is characterized by the exhaustion of the ovarian follicle pool, leading to less responsive ovaries despite the high levels of Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH). The consequential decrease in estrogen production results in symptoms like hot flashes, heavy sweating, headaches, hair loss, muscle pains, vaginal...
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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 not...
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In geriatric patients, renal physiology undergoes significant changes, including diminished renal blood flow and a lower glomerular filtration rate (GFR), leading to alterations in medication clearance. Drugs such as aminoglycoside antibiotics, lithium, and digoxin, which rely on glomerular filtration for removal from the body, particularly impact pharmacokinetics. These drugs tend to have slower clearance rates in older adults, necessitating careful dosage considerations.Evaluation of renal...
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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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Related Experiment Video

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Techniques to Induce and Quantify Cellular Senescence
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Measuring the Senescence-Associated Secretory Phenotype.

Achilleas Karras1,2, Georgios Lioulios3, Konstantia Kantartzi1,4

  • 1School of Medicine, Democritus University of Thrace, 68100 Alexandroupolis, Greece.

Biomedicines
|September 27, 2025
PubMed
Summary
This summary is machine-generated.

Cellular senescence, a key aging factor, involves a complex secretory phenotype (SASP). This review details methods to measure SASP components, crucial for understanding aging and developing senotherapeutics.

Keywords:
immunosenescenceimmunostainingprotein analysisquantitative reverse transcriptionsenescence-associated secretory phenotype

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Area of Science:

  • Gerontology and cellular biology, focusing on aging mechanisms and cellular responses.

Background:

  • Cellular senescence is a hallmark of aging, driving tissue dysfunction via the senescence-associated secretory phenotype (SASP).
  • The SASP is a complex mix of secreted molecules, varying by cell type and context, posing measurement challenges.
  • Understanding SASP is vital for aging research and developing senotherapeutic strategies.

Purpose of the Study:

  • To provide a comprehensive overview of methodologies for measuring SASP components.
  • To discuss the advantages and limitations of various detection techniques across different biological levels and sample types.
  • To identify gaps in current SASP detection strategies and suggest future research directions.

Main Methods:

  • Review of techniques measuring SASP at transcriptional (qRT-PCR, RNA sequencing, in situ hybridization), translational (ELISA, Western blotting, mass spectrometry, Luminex, MSD), and functional levels.
  • Analysis of methods applicable to cell cultures, tissues, and systemic fluids.
  • Inclusion of spatial detection methods like immunohistochemistry and immunofluorescence.

Main Results:

  • SASP measurement involves diverse methods across molecular levels (RNA, protein) and sample sources (cells, tissues, fluids).
  • Each method has specific advantages and limitations impacting SASP quantification accuracy and scope.
  • Multiparametric approaches are essential for a comprehensive understanding of senescent cell activity.

Conclusions:

  • Accurate SASP quantification is critical but challenging due to its complexity and context dependence.
  • Current methodologies offer various perspectives, but no single method captures the full SASP spectrum.
  • Further refinement of SASP detection strategies is needed for advancing aging and disease research, particularly in biomarker discovery.