Dietary supplementation with blueberry extract improves survival of transplanted dopamine neurons
Susan O McGuire1, Caryl E Sortwell, Barbara Shukitt-Hale
1Department of Pathology, Loyola University Medical School, Loyola University Chicago, Maywood, IL 60153, USA. smcguire@lumc.edu
Abstract:
The exact mechanisms contributing to poor neuronal survival in cell transplantation paradigms for Parkinson's disease (PD) are unknown. However, transplantation-induced host immune response, inflammation, and subsequent oxidative stress are likely contributors to cell death since dopamine (DA) neurons are exquisitely sensitive to oxidative damage. Multiple studies have attempted to improve cell survival by treating transplant material with antioxidant and antiinflammatory compounds, whereas far fewer studies have attempted to modify the host environment to reduce these threats. Flavonoids, phytochemicals found in fruits and vegetables, have antioxidant, antiinflammatory, and immunomodulatory properties. For example, supplementation with dietary blueberry extract (BBE) prevents oxidative stress-associated impairment of striatal motor function during aging and restores lost motor function in aged rats. We hypothesized that dietary supplementation of rodent diets with BBE would improve the survival of embryonic DA neurons transplanted into the unilaterally DA-depleted striatum. Inclusion of 2% BBE in a custom chow diet significantly increased the survival of implanted DA neurons and ameliorated rotational behavior asymmetries as compared to transplanted animals consuming a standard diet. These findings provide support for the potential of dietary phytochemicals as an easily administered and well-tolerated therapy that can be used to improve the effectiveness of DA neuron replacement.
Insights
Dietary blueberry extract (BBE) enhances survival of transplanted dopamine neurons in Parkinson's disease models. This dietary approach may improve cell replacement therapy effectiveness by reducing inflammation and oxidative stress.
Area of Science:
- Neuroscience
- Cell Biology
- Pharmacology
Background:
- Neuronal survival in Parkinson's disease (PD) cell transplantation is limited by host immune responses, inflammation, and oxidative stress.
- Dopamine (DA) neurons are particularly vulnerable to oxidative damage, complicating transplantation strategies.
- Flavonoids, like those in blueberry extract (BBE), possess antioxidant, anti-inflammatory, and immunomodulatory properties.
Purpose of the Study:
- To investigate if dietary blueberry extract (BBE) supplementation improves the survival of embryonic dopamine (DA) neurons transplanted into a Parkinson's disease rat model.
- To determine if BBE supplementation can mitigate the negative effects of the host environment on transplanted neuronal grafts.
Main Methods:
- Rodents with unilateral dopamine depletion received embryonic DA neuron transplants.
- Experimental group received a diet supplemented with 2% blueberry extract (BBE).
- Control group received a standard diet.
Main Results:
- Animals fed the BBE-supplemented diet showed significantly increased survival of transplanted DA neurons.
- BBE supplementation ameliorated rotational behavior asymmetries, indicating improved graft function.
- Transplanted neurons in the BBE group exhibited better survival compared to the standard diet group.
Conclusions:
- Dietary supplementation with blueberry extract (BBE) enhances the survival of transplanted dopamine neurons in a PD model.
- Phytochemicals, such as those in BBE, represent a promising, easily administered therapy to improve cell replacement strategies for Parkinson's disease.
- Modifying the host environment through diet may be a viable approach to boost the efficacy of neuroregenerative therapies.
