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Related Concept Videos

The Extracellular Matrix01:42

The Extracellular Matrix

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The Extracellular Matrix01:29

The Extracellular Matrix

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In order to maintain tissue organization, many animal cells are surrounded by structural molecules that make up the extracellular matrix (ECM). Together, the molecules in the ECM maintain the structural integrity of tissue as well as the remarkable specific properties of certain tissues.
Composition of the Extracellular Matrix
The extracellular matrix (ECM) is commonly composed of ground substance, a gel-like fluid, fibrous components, and many structurally and functionally diverse...
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Extracellular Matrix01:26

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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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Introduction to Connective Tissues01:11

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Connective tissues are one of the four main tissue types in humans that are extensively present in the body. They are characterized by cells embedded in an extracellular matrix (ECM) composed of a ground substance and three main types of protein fibers— collagen, elastic, and reticular fibers. The ground substance of connective tissues can range from a watery and jelly-like consistency to mineralized and hard. The wide variety of cells in the connective tissues include fibroblasts,...
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Classification of Connective Tissues01:30

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The connective tissues have different properties and functions in the human body. They are broadly categorized into proper, supporting, or fluid connective tissues.
Connective Tissue Proper
Connective tissue proper is the most abundant class of connective tissues. As its name implies, it predominantly connects different tissues in the body. Depending on the cell types, ground substance, viscosity, and fiber types in the ECM, connective tissue proper is further categorized into loose and dense....
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Embryonic Connective Tissues01:20

Embryonic Connective Tissues

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During early development, the embryo forms two types of connective tissues— the mesenchyme and mucoid connective tissue.
The mesenchyme is the first connective tissue that emerges in the developing embryo. It consists of loosely arranged multipotent mesenchymal cells and reticular fibers in the extracellular matrix. This loose arrangement allows easy migration of cells, which is essential for germ layer positioning, patterning, and organ morphogenesis during embryonic development.
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Updated: Feb 16, 2026

Long-term Intravital Immunofluorescence Imaging of Tissue Matrix Components with Epifluorescence and Two-photon Microscopy
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Basic Components of Vascular Connective Tissue and Extracellular Matrix.

Jaroslava Halper1

  • 1College of Veterinary Medicine and AU/UGA Medical Partnership, The University of Georgia, Athens, GA, United States.

Advances in Pharmacology (San Diego, Calif.)
|January 10, 2018
PubMed
Summary

Vascular cells and extracellular matrix (ECM) components maintain blood vessel structure and function. Their remodeling and cell traffic contribute to diseases like atherosclerosis and diabetic retinopathy.

Keywords:
Basal laminaCell adhesion moleculesCollagen typesContractile/synthetic phenotypesElastinEndothelial cellsFibroblastsGlycocalyxGlycosaminoglycansLeukocyte transmigrationMyofibroblastsPericytesProgenitor/stem cellsProteoglycansSelectinsSmooth muscle cellsTunica adventitiaTunica intimaTunica media

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Area of Science:

  • Vascular biology
  • Cellular and molecular medicine
  • Extracellular matrix research

Background:

  • Blood vessel walls have three layers with varying compositions, but share basic components and properties.
  • Vessel layer structure and composition are intrinsically linked to their specific functions.
  • Extracellular matrix (ECM) remodeling, driven by vascular cells, adapts vessel function to stimuli like blood flow changes.

Purpose of the Study:

  • To detail the roles of diverse vascular cell types and their synthesized ECM components.
  • To elucidate the contribution of these elements to maintaining normal blood vessel structure.
  • To explore their involvement in pathological processes including atherosclerosis, organ fibrosis, and diabetic retinopathy.

Main Methods:

  • Review of histological and functional aspects of blood vessel layers.
  • Analysis of cell types within the intima, media, and adventitia.
  • Examination of cell migration and transdifferentiation processes.
  • Investigation of ECM synthesis and remodeling by vascular cells.

Main Results:

  • Shared basic components and properties exist across blood vessel layers, despite compositional variations.
  • Vascular cell types, including smooth muscle cells and adventitial cells, exhibit significant inter-layer traffic.
  • Endothelial injury triggers cell migration and transdifferentiation for ECM repair.
  • Specific vascular cells and ECM components are implicated in major pathologies.

Conclusions:

  • Vascular cell types and ECM components are crucial for blood vessel homeostasis.
  • Aberrant cell behavior and ECM remodeling significantly contribute to vascular diseases.
  • Understanding these cellular and matrix dynamics is key to addressing pathologies like atherosclerosis and diabetic retinopathy.