Adipose-derived Stem Cell Sheets Induce Angiogenesis and Hepatic Stellate Cell Activation

Area of Science:

• Regenerative Medicine
• Hepatobiliary Surgery
• Stem Cell Biology

Background:

• Postoperative liver failure is a significant risk following liver resection.
• Adipose-derived stem cells (ADSCs) show regenerative potential, but their liver repair mechanisms are not fully understood.

Purpose of the Study:

• To investigate the effects of ADSC sheets on vascular and cellular responses in a mouse model of partial hepatectomy.
• To elucidate the mechanisms by which ADSCs promote liver regeneration.

Main Methods:

• Human ADSCs were cultured into multilayered cell sheets using magnetic nanoparticle-liposomes.
• ADSC or collagen control sheets were applied to liver resection sites in mice post-partial hepatectomy.
• Immunohistochemistry assessed angiogenesis (CD31) and hepatic stellate cell activation (α-SMA) on postoperative days 4 and 7.

Main Results:

• ADSC sheets significantly enhanced neovascularization (CD31 expression) compared to controls.
• CD31-positive cells were primarily of host origin, indicating recruitment of host cells.
• ADSC sheets increased α-SMA expression, suggesting sustained hepatic stellate cell activation, likely via paracrine signaling.

Conclusions:

• ADSC sheets promote liver regeneration post-hepatectomy by enhancing host cell-mediated angiogenesis.
• ADSC sheets stimulate hepatic stellate cell activation, contributing to liver repair.
• These findings support the clinical application of ADSC sheets for improving outcomes after liver resection.