Human liver stem/progenitor cells decrease serum bilirubin in hyperbilirubinemic Gunn rat

Area of Science:

• Hepatology
• Stem Cell Biology
• Metabolic Disorders

Background:

• Bilirubin conjugation is a critical liver function.
• Deficiency in bilirubin conjugation leads to hyperbilirubinemia.
• Adult-derived human liver stem/progenitor cells (ADHLSC) offer potential therapeutic applications.

Purpose of the Study:

• To evaluate the bilirubin conjugation capacity of ADHLSC in vitro.
• To assess the efficacy of ADHLSC in restoring bilirubin metabolism in vivo.
• To determine the long-term engraftment and metabolic function of transplanted ADHLSC.

Main Methods:

• ADHLSC underwent hepatogenic differentiation and in vitro bilirubin conjugation assays.
• Gunn rats, deficient in UGT1A1, received intraportal ADHLSC infusions.
• Serum bilirubin levels were measured via HPLC; cell engraftment confirmed by immunohistochemistry and RTqPCR.

Main Results:

• Large-scale culture did not alter ADHLSC phenotype; cells efficiently conjugated bilirubin.
• Transplanted Gunn rats showed sustained reduction in serum bilirubin levels starting at 3 months post-transplantation.
• Engraftment of ADHLSC in rat liver was confirmed by albumin and UGT1A1 expression.

Conclusions:

• ADHLSC are effective in conjugating bilirubin in vitro.
• ADHLSC transplantation successfully restored deficient bilirubin metabolism in hyperbilirubinemic rats.
• ADHLSC represent a promising cell-based therapy for liver metabolic disorders.