Dopamine Cell Therapy: From Cell Replacement to Circuitry Repair
Anders Björklund1, Malin Parmar1
1Department of Experimental Medical Science, Developmental and Regenerative Neurobiology, Wallenberg Neuroscience Center, Lund University, Lund, Sweden.
Journal of Parkinson'S Disease
|April 5, 2021
Summary
Cell therapy for Parkinson's disease (PD) using homotopic transplantation of midbrain dopamine (mDA) neurons into the substantia nigra shows promise for restoring neural circuitry. This approach may require growth factors to enhance neuron performance in larger brains.
Area of Science:
- Neuroscience
- Regenerative Medicine
- Cell Therapy
Background:
- Parkinson's disease (PD) involves degeneration of midbrain dopamine (mDA) neurons.
- Current cell therapy implants mDA neurons ectopically (e.g., putamen), potentially limiting function due to lack of normal regulation.
- Homotopic transplantation aims to restore normal circuitry by implanting cells into the substantia nigra.
Purpose of the Study:
- To evaluate the efficacy of homotopic transplantation of human embryonic stem cell-derived mDA neurons into the substantia nigra in rodent PD models.
- To assess the re-establishment of nigrostriatal and mesolimbic pathways and functional innervation.
- To investigate the afferent connectivity of intranigral grafts compared to intrinsic mDA systems.
Main Methods:
- Utilized human embryonic stem cell-derived mDA neurons for transplantation.
- Performed homotopic transplantation into the substantia nigra in rodent PD models.
- Employed rabies tracing to analyze host afferent inputs to the grafts.
Main Results:
- Intranigral grafts successfully re-established nigrostriatal and mesolimbic pathways.
- Grafts restored dense functional innervation in striatal, limbic, and cortical areas.
- Afferent connectivity of intranigral grafts closely mimicked the intrinsic mDA system, indicating superior circuitry reconstruction.
Conclusions:
- Homotopic transplantation into the substantia nigra offers a promising strategy for Parkinson's disease cell therapy.
- This approach facilitates more complete circuitry repair than ectopic transplantation.
- Enhancing the growth capacity of grafted mDA neurons, potentially with growth factors, may be necessary for application in larger brains like humans.
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