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Updated: Feb 4, 2026

Detection and Quantification of Tunneling Nanotubes Using 3D Volume View Images
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Standardized Method to Detect Tunneling Nanotubes in Human Skin Cells for Tissue Engineering Applications.

Tengfei Feng1, Dongyu Hou1, Dexuan Zhuang2

  • 1Savaid Stomatology School, Hangzhou Medical College; Engineering Laboratory for Biomaterials and Tissue Regeneration, Ningbo Stomatology Hospital; Ningbo Savaid Stomatology and Otolaryngology Medical Institute, Ningbo ENT Hospital.

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Tunneling nanotubes (TNTs) are thin cell connections. This study details a method to find and study TNTs in human skin cells, crucial for skin regeneration research.

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Area of Science:

  • Cell Biology
  • Dermatology
  • Microscopy

Background:

  • Tunneling nanotubes (TNTs) are actin-based conduits for intercellular cargo transfer.
  • TNT presence and characterization in human skin cells remain underexplored.

Purpose of the Study:

  • To establish a standardized protocol for detecting and characterizing TNTs in human epidermal keratinocytes and dermal fibroblasts in vitro.
  • To provide a methodological foundation for investigating TNT-mediated communication in skin biology and regeneration.

Main Methods:

  • Co-culture of primary human skin cells.
  • Gentle fixation, wheat germ agglutinin membrane labeling, and F-actin staining with phalloidin.
  • Inverted confocal microscopy with z-stack imaging for TNT identification and optional α-tubulin staining.

Main Results:

  • A reproducible method for TNT detection in dermal-dermal, epidermal-epidermal, and dermal-epidermal cell pairs was developed.
  • TNTs were characterized by their thin, straight protrusions, F-actin presence, and continuity across cells.
  • Cytoskeletal composition varied, with some TNTs containing F-actin and α-tubulin.

Conclusions:

  • The optimized protocol enables reliable detection and characterization of TNTs in human skin cell systems.
  • This standardized method facilitates future research into the role of TNTs in skin physiology and wound healing.