The effects of transforming growth factor-beta2 on dopaminergic graft survival
Shannon L Macauley1, Alexander D Horsch, Marinus Oterdoom
1Genzyme Corporation, Framingham, MA 01701, USA.
Abstract:
Dopaminergic cell transplantation is a promising therapeutic approach for the treatment of Parkinson's disease, the potential of which is limited due to poor survival and low dopamine content within engrafted tissue. In this study, the ability of transforming growth factor-beta2 (TGF-beta2) to influence transplant survival was evaluated. Cell suspensions containing fetal rat ventral mesencephalon (VM) cells were incubated prior to surgery with vehicle (DPBS), varying concentrations of TGF-beta2 (5-1000 ng/ml), or a pan-specific antibody against TGF-beta (1D11, 100 ng/ml). VM cell suspensions (200,000 cells) were unilaterally implanted into the striatum of adult Sprague-Dawley rats (n = 5-11 animals/group). Following a 3-week survival period, small but viable VM grafts containing tyrosine hydroxylase-positive (TH+) neurons and fibers were present in all animals. Addition of TGF-beta2 resulted in a steep, bell-shaped dose-response curve with a significant effect on TH+/dopamine cell survival. At 50 ng/ml TGF-beta2, the number of surviving dopamine neurons was increased twofold compared with controls. Addition of TGF-beta2 or 1D11 did not significantly influence graft volume. Further studies, possibly in combination with other neurotrophic factors, need to be performed to obtain a greater understanding of the effects of TGF-beta on dopamine neurons and fetal VM cell engraftment.
Insights
Transforming growth factor-beta2 (TGF-beta2) significantly enhances dopamine neuron survival in Parkinson
Area of Science:
- Neuroscience
- Regenerative Medicine
- Cell Biology
Background:
- Parkinson's disease (PD) treatment faces challenges with dopaminergic cell transplantation due to poor engraftment survival and low dopamine levels.
- Enhancing the survival of transplanted dopaminergic neurons is critical for effective PD therapies.
Purpose of the Study:
- To investigate the effect of transforming growth factor-beta2 (TGF-beta2) on the survival of fetal ventral mesencephalon (VM) cell transplants.
- To determine the optimal concentration of TGF-beta2 for improving dopaminergic neuron survival in a rat model of PD.
Main Methods:
- Fetal rat VM cells were incubated with varying concentrations of TGF-beta2 or a TGF-beta antibody before transplantation into the rat striatum.
- Graft survival and dopamine neuron (tyrosine hydroxylase-positive, TH+) content were assessed after a 3-week survival period.
Main Results:
- TGF-beta2 significantly increased TH+ neuron survival in a dose-dependent manner, with a twofold increase observed at 50 ng/ml.
- A bell-shaped dose-response curve was noted for TGF-beta2's effect on neuron survival.
- Graft volume was not significantly affected by TGF-beta2 or the TGF-beta antibody (1D11).
Conclusions:
- TGF-beta2 shows potential for improving dopaminergic cell transplant survival in PD.
- Further research is needed to explore the combined effects of TGF-beta2 with other neurotrophic factors for optimized cell engraftment.
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