Generation of functional hepatocytes from human spermatogonial stem cells

Area of Science:

• Stem cell biology
• Hepatology
• Regenerative medicine

Background:

• Generating functional human hepatocytes is crucial for treating liver diseases.
• Spermatogonial stem cells (SSCs) possess plasticity for differentiation.
• Previous attempts to generate hepatocytes from human SSCs were unsuccessful.

Purpose of the Study:

• To achieve direct transdifferentiation of human SSCs into mature and functional hepatocytes.
• To establish a novel cell source for liver disease therapy and toxicology screening.

Main Methods:

• A three-step induction protocol using defined medium was employed.
• Human SSCs were transdifferentiated into hepatic stem cells, then into mature hepatocytes.
• Cell morphology, marker expression (CK8, CK18, ALB, AAT, TF, TAT, cytochrome enzymes), and functional assays were used for characterization.

Main Results:

• Human SSCs successfully transdifferentiated into mature hepatocytes expressing specific liver markers.
• Derived hepatocytes demonstrated functional characteristics: albumin production, ammonia removal, and indocyanine green uptake.
• Upregulation of key transcription factors (β-CATENIN, HNF4A, FOXA1, GATA4) was observed during transdifferentiation.

Conclusions:

• Human SSCs can be directly transdifferentiated into mature, functional hepatocytes.
• This method provides a valuable source of human hepatocytes for therapeutic applications and drug screening.
• The study offers insights into human liver regeneration mechanisms.