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Adipogenesis induced by human adipose tissue-derived stem cells.

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Human adipose tissue-derived stem cells (ASCs) promote long-term in vivo adipogenesis and adipose tissue engineering. Optimal conditions involve controlled-release basic fibroblast growth factor (bFGF) for sustained cell proliferation and differentiation.

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Area of Science:

  • Regenerative Medicine
  • Stem Cell Biology
  • Tissue Engineering

Background:

  • Adipose tissue-derived stem cells (ASCs) are crucial for de novo adipogenesis.
  • ASCs are a promising cell source for adipose tissue engineering.
  • Understanding ASC behavior in vivo is vital for therapeutic applications.

Purpose of the Study:

  • To investigate in vivo adipogenesis induced by human ASCs over 24 weeks.
  • To evaluate the impact of basic fibroblast growth factor (bFGF) on ASCs in a collagen scaffold.
  • To determine optimal conditions for ASC-mediated adipose tissue formation.

Main Methods:

  • Human ASCs were isolated, expanded in vitro with bFGF, and differentiated.
  • Third-passage ASCs were incorporated into type I collagen scaffolds.
  • Scaffolds with varying ASC numbers and controlled-release bFGF were implanted subcutaneously in nude mice.
  • Adipose tissue formation was assessed via histology and immunohistochemistry up to 24 weeks.

Main Results:

  • ASCs proliferated significantly in vitro with bFGF, maintaining differentiation potential up to passage 3.
  • Implantation of 2 x 10^6 ASCs with controlled-release bFGF yielded the largest adipose tissue area at 24 weeks (2.14 mm^2).
  • Human-origin adipose tissue increased from 12 to 24 weeks in most ASC-implanted groups, indicating sustained in vivo activity.

Conclusions:

  • Human ASCs serve as effective progenitor cells for long-term in vivo adipogenesis.
  • ASCs can induce de novo adipose tissue formation over an extended period.
  • Controlled delivery of bFGF enhances ASC function in adipose tissue engineering.