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Updated: Apr 5, 2026
Direct Reprogramming of Mouse Fibroblasts into Melanocytes
Published on: August 27, 2021
Small-Molecule-Driven Direct Reprogramming of Mouse Fibroblasts into Functional Neurons
Xiang Li1, Xiaohan Zuo2, Junzhan Jing3
1The MOE Key Laboratory of Cell Proliferation and Differentiation, College of Life Sciences, Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China and Department of Cell Biology, School of Basic Medical Sciences, Peking University Stem Cell Research Center, Center for Molecular and Translational Medicine, State Key Laboratory of Natural and Biomimetic Drugs, Peking University Health Science Center, Beijing 100191, China.
Scientists chemically reprogrammed mouse fibroblasts into functional neurons using only small molecules, bypassing genetic manipulation. This breakthrough offers a promising new method for generating neuronal cells for regenerative medicine and drug discovery.
Area of Science:
- Cell Biology
- Neuroscience
- Chemical Biology
Background:
- Direct lineage reprogramming using transcription factors is established.
- Genetic manipulation can limit the application of cell reprogramming.
- Alternative cell sources are needed for drug discovery and regenerative medicine.
Purpose of the Study:
- To investigate the chemical induction of direct somatic cell fate conversion.
- To generate functional neuronal cells from fibroblasts without genetic modification.
- To elucidate the molecular mechanisms underlying chemical reprogramming.
Main Methods:
- Fibroblast cultures treated with a small molecule cocktail.
- Assessment of neuronal markers (e.g., TUJ1) and yield.
- Electrophysiological recordings to evaluate neuronal function (action potentials, synaptic activity).
- Pharmacological inhibition of BET bromodomain proteins and neurogenesis induction.
Main Results:
- Achieved >90% conversion of fibroblasts to TUJ1-positive neuronal cells within 16 days.
- Chemically induced neurons (CiNs) exhibited mature neuronal characteristics, including action potential generation and functional synapses.
- Identified I-BET151 as a BET bromodomain inhibitor disrupting fibroblast programs and ISX9 as a neurogenesis inducer.
Conclusions:
- Demonstrated chemical induction of direct somatic cell reprogramming across germ layers without genetic manipulation.
- Provided a proof of principle for generating functional neurons from fibroblasts using small molecules.
- Highlighted the potential of small molecules for cell fate conversion in regenerative medicine and drug discovery.
