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Related Concept Videos

Capillaries and Their Types01:20

Capillaries and Their Types

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Capillaries, a crucial constituent of the circulatory system, are diminutive vessels with a diameter between 5–10 micrometers, accommodating perfusion to the tissues through the phenomenon known as microcirculation. Through their permeable walls, consisting of an endothelial layer ensconced by a basement membrane and sporadically dispersed smooth muscle fibers, the exchange of substances between the blood and the interstitial fluid becomes plausible. Variance in wall composition exists,...
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Capillary Beds01:20

Capillary Beds

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Capillary beds are networks of tiny blood vessels that play a crucial role in the circulatory system. These beds are where the exchange of gases, nutrients, and waste products occurs between the blood and surrounding tissues. Each capillary bed consists of numerous capillaries, which are the smallest blood vessels in the body, typically only one cell-thick. This thinness allows for the efficient diffusion of substances.
Capillaries connect arterioles, small branches of arteries, to venules,...
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Autoregulation of Blood Flow01:17

Autoregulation of Blood Flow

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Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation....
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Blood Flow01:29

Blood Flow

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Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
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Related Experiment Video

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Micropatterning and Assembly of 3D Microvessels
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Synthetic Capillaries to Control Microscopic Blood Flow.

K Sarveswaran1, V Kurz1, Z Dong1

  • 1Depts. Biological Science and Electrical Engineering, 316 Stinson-Remick Hall, University of Notre Dame, Notre Dame, IN 46556.

Scientific Reports
|February 25, 2016
PubMed
Summary
This summary is machine-generated.

Live cell lithography rapidly engineers functional capillaries in vitro. This breakthrough in tissue engineering precisely controls cell placement, mimicking natural nutrient diffusion and supporting blood flow for organoid development.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Cellular Biology

Background:

  • Capillaries are vital for nutrient delivery in human physiology, with a mean intercapillary distance of approximately 100 μm.
  • Engineered tissues often lack capillaries, leading to hypoxia, necrosis, and impaired function.
  • Replicating the complex cytoarchitecture of capillaries in vitro presents a significant engineering challenge.

Purpose of the Study:

  • To develop a rapid and precise method for engineering functional capillary-like structures in vitro.
  • To create a tubular microenvironment that mimics the mechanical and structural properties of native human capillaries.
  • To demonstrate the utility of this method for creating functional units for organoid development.

Main Methods:

  • Utilized "live cell lithography" (LCL) to precisely control cell type and position on a composite hydrogel scaffold.
  • Engineered tubular microenvironments with elastic modulus and porosity comparable to human tissue.
  • Constructed capillary mimics within approximately 30 minutes.

Main Results:

  • The engineered capillary constructs mimicked bona fide capillaries in vitro.
  • These constructs supported forces associated with blood flow and established nutrient gradients similar to in vivo measurements.
  • Live cell lithography achieved single-cell precision in capillary construction, surpassing other tissue engineering methods.

Conclusions:

  • Live cell lithography offers an unprecedented level of precision for engineering capillary structures.
  • This method enables the rapid creation of functional microvascular networks essential for engineered tissues and organoids.
  • The technology is poised for adaptation in creating minimal functional units of human tissue for organ development.