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Related Concept Videos

The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

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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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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
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Unlike epithelial tissue, which is composed of cells closely packed with little or no extracellular space in between, connective tissue cells are dispersed in a matrix. This extracellular matrix (ECM) is composed of fibrous proteins like collagen, elastin, and fibronectin in a ground substance consisting of interstitial fluid, cell adhesion proteins, and proteoglycans. The proteoglycans form a gel-like material in the spaces between cells and provide hydration, buffering, binding, and force...
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Renewal of Skin Epidermal Stem Cells01:12

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The skin is divided into epidermis, dermis, and hypodermis, the skin's outermost, middle, and inner layers. The human epidermal layer regularly undergoes renewal, where old, dead cells are replaced by new cells. Epidermal stem cells or EpiSCs divide and differentiate to restore the lost cells. For the renewal process, some EpiSCs continuously self-renew. In contrast, few others differentiate into transit-amplifying cells, which later form prickle or spinous cells, followed by granular...
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Bone Disorders01:29

Bone Disorders

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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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Clinical Applications of Epidermal Stem Cells01:19

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Epidermal stem cells (EpiSCs) are mainly located at the basal layer of the epidermis. These cells repair minor injuries of the skin and replace dead skin cells. However, EpiSCs’ cannot heal severe wounds such as major burns or those from diabetes or hereditary disorders. In such cases, culturing the epidermal stem cells from the patient is possible and has yielded successful treatment options, such as laboratory-grown skin grafts. These grafts are synthesized using a patient’s own...
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Related Experiment Video

Updated: Sep 20, 2025

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Epithelial damage and ageing: the perfect storm.

Richard J Hewitt1, Laurence Pearmain2,3, Elisavet Lyka4

  • 1King's Centre for Lung Health, King's College London, London, UK.

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|May 27, 2025
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Summary

Cellular aging makes the alveolar epithelium vulnerable, contributing to idiopathic pulmonary fibrosis (IPF) development. Understanding these age-related changes offers new therapeutic targets for IPF.

Keywords:
Idiopathic pulmonary fibrosisInnate ImmunityInterstitial Fibrosis

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Area of Science:

  • Pulmonary Medicine
  • Cellular Biology
  • Aging Research

Background:

  • Idiopathic pulmonary fibrosis (IPF) is a progressive lung scarring disease initiated by alveolar epithelial microinjury.
  • Cellular aging, including telomere dysfunction, impairs the epithelium's response to injury, driving IPF pathogenesis.

Purpose of the Study:

  • To review how aging increases alveolar epithelial vulnerability to insults.
  • To discuss the consequences of epithelial dysfunction on repair and cell interactions in IPF.

Main Methods:

  • Review of scientific literature on aging and IPF.
  • Analysis of cellular mechanisms underlying epithelial dysfunction in aging.

Main Results:

  • Aging disrupts cellular homeostasis, including replication, genomic stability, and metabolic function, leading to epithelial vulnerability.
  • Dysfunctional alveolar epithelium in IPF exhibits altered repair capacity and phenotype, promoting profibrotic signaling.

Conclusions:

  • The aging epithelium's stalled differentiation, failed repair, and profibrotic signaling contribute to IPF.
  • Investigating aberrant epithelial behavior and its impact on other cells can identify novel therapeutic targets for early IPF intervention.