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Related Concept Videos

Cell-matrix's Response to Mechanical Forces01:13

Cell-matrix's Response to Mechanical Forces

In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
Anchoring junctions mechanically attach a cell to the...
Structural Protein Function01:56

Structural Protein Function

Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity.  In bones and teeth, it mineralizes to form...
Tension Response at Adherens Junctions01:26

Tension Response at Adherens Junctions

The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
α-Catenin as a Mechanosensory Protein
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin homology) domains...
Extracellular Matrix01:26

Extracellular Matrix

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...
Dense Connective Tissue01:13

Dense Connective Tissue

Dense connective tissue contains more collagen fibers than loose connective tissue. As a consequence, it displays greater resistance to stretching. There are two major categories of dense connective tissue— regular and irregular.
Dense Regular Connective Tissue
In dense regular connective tissue, fibers are arranged parallel to each other, enhancing its tensile strength and resistance to stretching in the direction of the fiber orientations. Ligaments and tendons are made of dense regular...
Phases of Wound Repair01:28

Phases of Wound Repair

Following injury, the integrity of the injured tissues must be reestablished. For example, in skin tissue, wound repair involves coordination among resident skin cells, blood mononuclear cells, extracellular matrix, growth factors, and cytokines to complete the healing cascade.
Formation of Blood Clot
In case of deep injuries, trauma to blood vessels results in blood loss. In the meantime, phospholipids released from the ruptured endothelial cellular membrane are converted into arachidonic...

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Related Experiment Video

Updated: Jun 20, 2026

Ex vivo Mechanical Loading of Tendon
11:36

Ex vivo Mechanical Loading of Tendon

Published on: May 28, 2007

From mechanical loading to collagen synthesis, structural changes and function in human tendon.

M Kjaer1, H Langberg, K Heinemeier

  • 1Department of Orthopaedics, Institute of Sports Medicine, Bispebjerg Hospital, Copenhagen, Denmark. m.kjaer@mfi.ku.dk

Scandinavian Journal of Medicine & Science in Sports
|August 27, 2009
PubMed
Summary
This summary is machine-generated.

Tendon collagen synthesis increases with exercise, but females show a reduced response compared to males, potentially due to estrogen. Mechanical strain, not stress, drives this adaptation, with growth factors like IGF-I playing a key role.

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Engineering Tendon Assembloids to Probe Cellular Crosstalk in Disease and Repair
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Engineering Tendon Assembloids to Probe Cellular Crosstalk in Disease and Repair

Published on: March 22, 2024

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Last Updated: Jun 20, 2026

Ex vivo Mechanical Loading of Tendon
11:36

Ex vivo Mechanical Loading of Tendon

Published on: May 28, 2007

Engineering Tendon Assembloids to Probe Cellular Crosstalk in Disease and Repair
08:32

Engineering Tendon Assembloids to Probe Cellular Crosstalk in Disease and Repair

Published on: March 22, 2024

Area of Science:

  • Connective tissue biology
  • Exercise physiology
  • Biochemistry

Background:

  • Connective tissue adaptation to loading involves matrix protein synthesis, particularly collagen.
  • Tendon collagen turnover increases with exercise, but a gender difference in response is noted, with females exhibiting a diminished collagen synthesis increase.
  • Estrogen may influence this diminished response in females, while growth factors like IGF-I and TGF-beta-1 stimulate collagen synthesis.

Purpose of the Study:

  • To investigate the adaptive response of tendon connective tissue to mechanical loading.
  • To explore gender differences in collagen synthesis following exercise.
  • To identify key biochemical factors and mechanical signals influencing tendon adaptation.

Main Methods:

  • Analysis of collagen synthesis and degradation markers in response to acute and chronic loading.
  • Measurement of growth factor and cytokine concentrations (IGF-I, TGF-beta-1, PGE2, IL-6) in human tendon tissue after exercise.
  • Comparison of responses to different types of muscle contractions (concentric, isometric, eccentric).

Main Results:

  • Exercise increases tendon collagen synthesis and turnover, with females showing a lesser response than males.
  • Mechanical strain, rather than stress, appears to be the primary determinant of collagen synthesis stimulation.
  • Exercise leads to increased interstitial concentrations of TGF-beta, PGE2, IGF-I, and IL-6, including the mechano growth factor (MGF) isoform of IGF-I.
  • Tendon adaptation to chronic loading is slower than in muscle or heart, with significant dimensional changes observed only after prolonged loading.

Conclusions:

  • Tendon adaptation to mechanical loading involves complex interplay between mechanical signaling and biochemical changes.
  • Habitual loading leads to robust changes in tendon size and mechanical properties over time.
  • Understanding these adaptations is crucial for optimizing training and injury prevention strategies.