The Effects of Deep Brain Stimulation of the Subthalamic Nucleus on Vascular Endothelial Growth Factor, Brain-Derived Neurotrophic Factor, and Glial Cell Line-Derived Neurotrophic Factor in a Rat Model of Parkinson's Disease.

Abstract:

OBJECTIVE:Deep brain stimulation (DBS) of the subthalamic nucleus (STN) has evolved as a powerful therapeutic alternative for the treatment of Parkinson's disease (PD). Despite its clinical efficacy, the mechanisms of action have remained poorly understood. In addition to the immediate symptomatic effects, long-term neuroprotective effects have been suggested. Those may be mediated through neurotrophic factors (NFs) like vascular endothelial growth factor (VEGF), brain-derived neurotrophic factor (BDNF), and glial cell line-derived neurotrophic factor (GDNF). Here, the impact of DBS on the expression of NFs was analysed in a rat model of PD. METHODS:Unilateral 6-hydroxydopamine (6-OHDA) lesioned rats received DBS in the STN using an implantable microstimulation system, sham DBS in the STN, or no electrode placement. Continuous unilateral STN-DBS (current intensity 50 µA, frequency 130 Hz, and pulse width 52 µs) was conducted for 14 days. Rats were then sacrificed and brains shock frozen. Striata and motor cortices were dissected with a cryostat. Levels of VEGF, BDNF, and GDNF were analysed, both by quantitative PCR and colorimetric ELISA. RESULTS:PCR revealed a significant upregulation of only BDNF mRNA in the ipsilateral striata of the DBS group, when compared to the sham-stimulated group. There was no significant increase in VEGF mRNA or GDNF mRNA. ELISA analysis showed augmentations of BDNF, VEGF, as well as GDNF protein in the ipsilateral striata after DBS compared to sham stimulation. In the motor cortex, significant increases after DBS were observed for BDNF only, not for the other 2 NFs. CONCLUSIONS:The upregulation of trophic factors induced by STN-DBS may participate in its long-term therapeutic efficacy and potentially neuroprotective effects.

authors

Faust K,Vajkoczy P,Xi B,Harnack D

doi

10.1159/000511121

subject

Has Abstract

pub_date

2020-11-05 00:00:00

pages

1-11

eissn

1011-6125

issn

1423-0372

pii

000511121

pub_type

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