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Related Concept Videos

Ion Channels01:19

Ion Channels

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The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
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Growth of Cartilage and Bone Tissue01:27

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Chondrocytes form a temporary cartilaginous model by dividing and secreting a thick gel-like extracellular matrix. Once the chondrocytes undergo programmed cell death, osteoblasts enter the site of the cartilaginous model. The process of replacing the temporary cartilaginous model with bone in an ordered manner is called endochondral ossification. In endochondral ossification, not all of the cartilage is replaced by bone tissue. Some cartilage that performs a protective and supportive function...
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Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
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Non-verbal communication plays a critical role in human interaction, influencing how individuals perceive emotions and psychological states. It operates through four primary channels: facial expressions, eye contact, body language, and touch. These non-verbal cues help convey meaning beyond spoken language and are often culturally influenced.Facial Expressions and Emotional RecognitionFacial expressions are among the most powerful and universal forms of non-verbal communication. Research has...
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Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...
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Related Experiment Video

Updated: Jan 27, 2026

Decellularization and Recellularization Methodology for Human Saphenous Veins
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Recellularization of auricular cartilage via elastase-generated channels.

J Lehmann1,2, S Nürnberger3,4,5, R Narcisi6

  • 1Department of Otorhinolaryngology and Head and Neck Surgery Erasmus MC, Rotterdam, The Netherlands.

Biofabrication
|March 29, 2019
PubMed
Summary

Digesting elastin in cartilage scaffolds creates channels, enabling stem cell colonization for tissue regeneration. This strategy enhances matrix restoration and mechanical properties, offering a new approach for cartilage repair.

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Tissue Engineering

Background:

  • Decellularized tissue matrices are explored for regenerating poorly healing tissues like cartilage.
  • The dense nature of decellularized cartilage limits stem cell infiltration and colonization.
  • Effective recellularization is crucial for restoring tissue function and mechanical integrity.

Purpose of the Study:

  • To investigate the impact of elastin fiber digestion on decellularized cartilage matrix.
  • To assess the efficacy of creating cell migration channels for improved stem cell colonization.
  • To evaluate the potential of this strategy for cartilage tissue regeneration and functional restoration.

Main Methods:

  • Auricular cartilage was decellularized and treated to digest elastin fiber bundles, creating microchannels.
  • Human chondrocytes and bone marrow-derived mesenchymal stromal cells were used to colonize the treated scaffolds.
  • Scaffold colonization, matrix restoration (glycosaminoglycan content), mechanical properties, and tissue shape were analyzed.
  • In vivo studies involved subcutaneous implantation of osteochondral biopsies to assess colonization by endogenous cells.

Main Results:

  • Elastin digestion successfully created channels within the decellularized cartilage matrix.
  • Human chondrocytes and mesenchymal stromal cells efficiently colonized the scaffolds via these channels.
  • The recellularized tissues showed restored glycosaminoglycan-rich matrix and improved mechanical properties.
  • The size and shape of the restored tissue were maintained.
  • Rapid colonization by endogenous cartilage-forming cells was observed in the in vivo model.

Conclusions:

  • Digesting elastin fibers in decellularized cartilage creates effective channels for cell migration and colonization.
  • This approach promotes matrix restoration and enhances mechanical properties, leading to functional tissue restoration.
  • Creating channels in tissue matrices is a broadly applicable strategy for recellularization and tissue repair.