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P-N junction01:11

P-N junction

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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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The Neuromuscular Junction01:19

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The nervous system consists of complex motor neuron circuits, including upper motor neurons originating from the cerebral cortex and lower motor neurons starting in the spinal cord, coordinating both voluntary and involuntary movements. Among these, somatic motor neurons activate skeletal muscles and are classified into alpha, beta, and gamma types. Alpha neurons are vital for voluntary movement coordination, while gamma neurons adjust muscle spindle sensitivity, and the function of beta...
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Anchoring Junctions01:03

Anchoring Junctions

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Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
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Adherens Junctions01:24

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Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types –  adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as  epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as  heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
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Gap Junctions01:27

Gap Junctions

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The cytoplasm of adjacent animal cells can exchange small molecules, ions, and secondary messengers via the communication channels which form the gap junctions. These junctions comprise a few hundred to thousands of molecular channels, each made of two halves, called the connexon hemichannel. A connexon is a hexamer of six transmembrane connexin proteins, which assemble radially, thus forming a pore or channel in the center. One connexon hemichannel docks with a corresponding connexon on the...
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Gap Junctions01:37

Gap Junctions

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Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores between neighboring cells in animals, connecting the cytoplasm between the two, and allowing for the exchange of molecules and ions. They are found in a wide range of invertebrate and vertebrate species, mediate numerous functions including cell differentiation and development, and are associated with numerous human diseases, including cardiac and...
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Recapitulating the human myotendinous junctionin vitrousing a 3D bioprinted model.

Francesca De Paolis1,2, Marina Volpi3, Claudia Fuoco1

  • 1Department of Biology, University of Rome Tor Vergata, Rome 00133, Italy.

Biofabrication
|January 26, 2026
PubMed
Summary

Researchers created a 3D model of the myotendinous junction (MTJ) using human cells and rotary wet-spinning. This biomimetic model accurately mimics the MTJ

Keywords:
3D bioprintingmyotendinous junctionskeletal muscletendontissue engineeringwet-spinning

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Musculoskeletal Research

Background:

  • The myotendinous junction (MTJ) is crucial for force transmission and movement.
  • MTJ injuries are common, exacerbated by aging and neuromuscular disorders.
  • Limited human tissue availability hinders MTJ research.

Purpose of the Study:

  • To develop an advanced in vitro model of the human myotendinous junction.
  • To overcome limitations of traditional research methods for MTJ studies.
  • To create a platform for investigating MTJ pathophysiology and therapeutics.

Main Methods:

  • Utilized rotary wet-spinning technology to create hydrogel fibers.
  • Spatially patterned human primary pericytes and tendon-derived stem cells.
  • Developed a 3D multicellular tissue construct mimicking MTJ architecture.

Main Results:

  • Confirmed presence of key muscle and tendon-specific markers (Collagen I, III, Tenascin, Tenomodulin, Myosin Heavy Chain).
  • Observed cellular organization recapitulating the native MTJ interdigitated structure.
  • Identified specialized junctional niche markers (Collagen VI, THBS4, COL22, Paxillin, NCAM1) indicating cell-matrix interactions and anchorage.

Conclusions:

  • Successfully developed a human-derived 3D biomimetic MTJ model.
  • The model accurately replicates native MTJ microenvironment and cellular organization.
  • This platform offers potential for studying MTJ development, disease, and therapeutic strategies.