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Related Experiment Video

Updated: Nov 25, 2025

Development of Human Renal Tubular Epithelial Cell Primary Cultures in Monolayers and Three-Dimensional Conditions
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Matrigel-Free Laminin-Entactin Matrix to Induce Human Renal Proximal Tubule Structure Formation In Vitro.

M Adelfio1, S Szymkowiak1, D L Kaplan1

  • 1Department of Biomedical Engineering, Tufts University, Medford, Massachusetts 02155, United States.

ACS Biomaterials Science & Engineering
|December 15, 2020
PubMed
Summary

Researchers developed a Matrigel-free method using a laminin-entactin matrix for reproducible in vitro kidney proximal convoluted tubule (PCT) formation. This defined biomaterial supports tubulogenesis and cell polarity, advancing kidney tissue engineering and nephrotoxicity studies.

Keywords:
Matrigelin vitrokidneylaminin−entactinproximal tubuletubular basement membrane

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Area of Science:

  • Biomaterials Science
  • Renal Physiology
  • Tissue Engineering

Background:

  • Reproducible in vitro tissue models are crucial for research.
  • Matrigel, a common biomaterial for kidney proximal convoluted tubule (PCT) formation, suffers from undefined composition and batch variability.
  • There is a need for a defined, consistent biomaterial to support PCT development in vitro.

Purpose of the Study:

  • To develop and characterize a Matrigel-free method for generating in vitro proximal tubular-like structures.
  • To evaluate a laminin-entactin (L-E) matrix as a defined biomaterial for supporting kidney tubule formation.
  • To assess the potential of this new method for kidney tissue engineering and nephrotoxicity studies.

Main Methods:

  • Utilized immortalized human renal epithelial cells (RPTEC/TERT1) cocultured with murine fibroblast stromal cells (FOXD1).
  • Employed a defined laminin-entactin (L-E) matrix to support cell culture and induce tubulogenesis.
  • Analyzed the formation of PCT-like structures using key markers (E-cadherin, aquaporin-1, Na+/K+ ATPase) and assessed cell polarity and lumen formation.

Main Results:

  • The laminin-entactin (L-E) matrix successfully supported the formation of proximal tubular-like structures in vitro.
  • The matrix recapitulated key components of the native tubular basement membrane and included fibroblast growth factor 8a (FGF-8a).
  • The resulting PCT structures exhibited cell polarity, a defined lumen, and expression of specific PCT markers after 18 days.

Conclusions:

  • A defined laminin-entactin (L-E) matrix provides a reproducible alternative to Matrigel for in vitro kidney proximal tubule development.
  • This Matrigel-free approach advances kidney tissue engineering by offering a consistent and well-characterized biomaterial.
  • The developed model is suitable for studying proximal tubule development and for conducting in vitro nephrotoxicity assessments.