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Autoinduction-Based Quantification of In Situ TGF-β Activity in Native and Engineered Cartilage.

Tianbai Wang1, Sung Yeon Kim2,3, Yifan Peng2

  • 1Division of Materials Science & Engineering, Boston University, Boston, Massachusetts, USA.

Tissue Engineering. Part C, Methods
|September 23, 2024
PubMed
Summary
This summary is machine-generated.

A new method quantifies transforming growth factor beta (TGF-β) activity in live cartilage using latent TGF-β (LTGF-β) as a biomarker. This approach enables accurate, non-destructive measurement of TGF-β in engineered and native tissues.

Keywords:
TGF-β deliveryarticular cartilageautoinductioncartilage tissue engineeringgrowth factor activitymechanobiology

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Biochemistry

Background:

  • Transforming growth factor beta (TGF-β) is crucial for cartilage homeostasis and is used in tissue engineering.
  • Quantifying TGF-β activity in live, three-dimensional tissues in situ is challenging with current methods.
  • Existing techniques like Western blotting or reporter assays are unsuitable for direct measurement in complex tissues.

Purpose of the Study:

  • To develop a novel platform for quantifying in situ TGF-β activity in live cartilage.
  • To establish latent TGF-β (LTGF-β) as a non-destructive, label-free biomarker for TGF-β activity.
  • To validate the platform using native and engineered cartilage models.

Main Methods:

  • Utilized TGF-β's autoinduction response, where active TGF-β stimulates cells to secrete latent TGF-β (LTGF-β).
  • Measured LTGF-β1 secretion levels using isoform-specific ELISA in bovine native cartilage explants and engineered constructs.
  • Exposed tissues to varying doses of active TGF-β3 and analyzed LTGF-β secretion and retention.

Main Results:

  • LTGF-β secretion increased proportionally with active TGF-β exposure (7.4-fold in native, 6.6-fold in engineered cartilage).
  • Synthesized LTGF-β showed low retention within both native and engineered cartilage tissues.
  • Secreted LTGF-β remained stable in conditioned media for two weeks, allowing standard curve generation.

Conclusions:

  • Cell-secreted LTGF-β is a reliable biomarker for quantifying in situ TGF-β activity in live cartilage.
  • The developed platform accurately measures TGF-β activity in native cartilage under physiological loading (up to 0.59 ng/mL).
  • The method successfully quantified in situ TGF-β activity in TGF-β-conjugated scaffolds for tissue engineering (1.81 ng/mL).