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Environmental Modulations of the Number of Midbrain Dopamine Neurons in Adult Mice
Published on: January 20, 2015
A MicroRNA feedback circuit in midbrain dopamine neurons
Jongpil Kim1, Keiichi Inoue, Jennifer Ishii
1Departments of Pathology and Neurology, Center for Neurobiology and Behavior, and Taub Institute, Columbia University, College of Physicians and Surgeons 15-403, 630 West 168th Street, New York, NY 10032, USA.
Science (New York, N.Y.)
|September 1, 2007
Summary
MicroRNAs (miRNAs) play a role in brain cell function. A specific miRNA, miR-133b, is linked to Parkinson's disease by regulating dopaminergic neuron maturation and behavior.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- MicroRNAs (miRNAs) are small non-coding RNAs regulating gene expression.
- Their function in postmitotic neurons, like those in the mammalian central nervous system, is not fully understood.
- Dopaminergic neurons (DNs) in the midbrain are crucial for motor control and are affected in Parkinson's disease.
Purpose of the Study:
- To investigate the role of miRNAs in mammalian midbrain dopaminergic neurons (DNs).
- To identify specific miRNAs involved in DN function and their potential link to Parkinson's disease.
Main Methods:
- Identification of specific miRNAs expressed in midbrain DNs.
- Analysis of miRNA expression in Parkinson's disease patient tissue.
- Investigation of miRNA regulatory circuits involving transcription factors.
Main Results:
- A specific miRNA, miR-133b, was identified and found to be deficient in midbrain tissue from Parkinson's disease patients.
- miR-133b was shown to regulate the maturation and function of midbrain DNs.
- A negative feedback circuit involving miR-133b and the transcription factor Pitx3 was elucidated.
Conclusions:
- miR-133b plays a critical role in the maturation and function of midbrain dopaminergic neurons.
- The miR-133b/Pitx3 feedback circuit is proposed to be involved in fine-tuning dopaminergic behaviors, such as locomotion.
- Dysregulation of miR-133b may contribute to the pathophysiology of Parkinson's disease.
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