Conversion of human fibroblasts into functional cardiomyocytes by small molecules

Area of Science:

• Biomedical Engineering
• Stem Cell Biology
• Pharmacology

Background:

• Reprogramming somatic cells into specific lineages is crucial for regenerative medicine.
• Generating homogeneous, functional cell types from human cells remains a significant challenge.

Purpose of the Study:

• To investigate the efficacy of a novel nine-compound cocktail (9C) in transdifferentiating human fibroblasts into cardiomyocyte-like cells.
• To characterize the properties of chemically induced cardiomyocyte-like cells.

Main Methods:

• Treatment of human fibroblasts with a specific combination of nine compounds (9C).
• Analysis of transcriptome, epigenetics, and electrophysiological properties of generated cells.
• In vivo transplantation into infarcted mouse hearts to assess in vivo reprogramming.

Main Results:

• 9C treatment successfully generated cardiomyocyte-like cells from human fibroblasts.
• These cells exhibited uniform contraction and molecular profiles (transcriptome, epigenetics, electrophysiology) similar to human cardiomyocytes.
• Pharmacological treatment induced an open-chromatin state in cardiac developmental genes, facilitating cardiogenic signaling.
• Transplanted cells efficiently converted to cardiomyocyte-like cells in vivo.

Conclusions:

• A nine-compound cocktail (9C) provides an effective pharmacological approach for direct lineage reprogramming of fibroblasts into cardiomyocyte-like cells.
• This method demonstrates potential for therapeutic applications in regenerative medicine, particularly for cardiac repair.
• Further optimization is needed to achieve mature cardiac cell generation.