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Reprogramming canine cryopreserved hepatocytes to hepatic progenitor cells using small molecule compounds.

Yu Yamazaki1, Kaoruko Kikuchi1, Yoko Yamada1

  • 1Laboratory of Small Animal Internal Medicine, School of Veterinary Medicine, Azabu University, Sagamihara City, Kanagawa, Japan.

Regenerative Therapy
|November 25, 2024
PubMed
Summary

Researchers successfully reprogrammed cryopreserved canine hepatocytes into hepatic progenitor cells using specific small molecules. This breakthrough offers potential for canine liver disease treatments and drug metabolism studies.

Keywords:
Canine liver progenitor cellsCryopreserved canine hepatocytesSmall molecule compounds

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Area of Science:

  • Veterinary Medicine
  • Cell Biology
  • Regenerative Medicine

Background:

  • Establishing consistent methods for culturing stable canine hepatocytes is crucial for liver transplantation and drug metabolism testing.
  • Previous studies have demonstrated successful reprogramming of mature hepatocytes into hepatic progenitor cells in rats, mice, and humans using specific small molecules.
  • Evidence for successful reprogramming of canine hepatocytes using these small molecules is currently lacking.

Purpose of the Study:

  • To induce the differentiation of mature canine hepatocytes into progenitor cells.
  • To investigate the efficacy of a specific combination of small molecules (YAC) in reprogramming canine hepatocytes.
  • To establish a foundation for developing artificial livers for drug discovery and transplantation therapy in dogs.

Main Methods:

  • Cryopreserved canine hepatocytes (cHep) were cultured for 14 days in a hepatocyte growth medium supplemented with YAC (Y-27632, A-83-01, and CHIR99021).
  • Assessment involved morphological observations, quantitative real-time polymerase chain reaction (qRT-PCR), and immunocytochemistry to evaluate cell changes and marker expression.

Main Results:

  • Cryopreserved canine hepatocytes proliferated and formed colonies, indicating reprogramming into hepatic progenitor cells.
  • qRT-PCR showed significant increases in progenitor cell markers (AFP, EpCAM, CK19, Sox9) and decreases in mature hepatocyte markers (ALB, MRP2).
  • Immunocytochemistry confirmed the expression of progenitor cell markers (AFP, EPCAM, SOX9, CK19) and reduced expression of mature hepatocyte markers.

Conclusions:

  • The study successfully demonstrated the reprogramming of cryopreserved canine hepatocytes into hepatic progenitor cells using the YAC small-molecule combination.
  • This reprogramming was validated by increased progenitor cell markers and decreased mature hepatocyte markers at both mRNA and protein levels.
  • Cultivating canine liver progenitor cells presents a promising avenue for advancing drug discovery, artificial liver development, and transplantation therapies for canine liver diseases.