c-Fos expression after deep brain stimulation of the pedunculopontine tegmental nucleus in the rat 6-hydroxydopamine Parkinson model |
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Authors: | Saryyeva Assel Nakamura Makoto Krauss Joachim K Schwabe Kerstin |
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Affiliation: | Department of Neurosurgery, Medical University, MHH, Carl-Neuberg-Str. 1, D-30625 Hannover, Germany |
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Abstract: | Deep brain stimulation (DBS) is used to alleviate motor dysfunction in Parkinson's disease (PD). The pedunculopontine nucleus (PPN) may be a potential target for severe freezing and postural instability with 25 Hz stimulation being considered more effective than 130 Hz stimulation. Here we evaluated the expression of c-Fos after 25 Hz and 130 Hz DBS of the pedunculopontine tegmental nucleus (PPTg, i.e., the rodent equivalent to the human PPN) in the rat 6-hydroxydopamine (6-OHDA) PD model.Anaesthetized male Sprague Dawley rats with unilateral 6-OHDA-induced nigrostriatal lesions were stimulated with 25 Hz, 130 Hz, or 0 Hz sham-stimulation for 4 h by electrodes implanted into the ipsilateral PPTg. Thereafter the distribution and number of neurons expressing the immediate early gene c-Fos, a marker for acute neuronal activity, was assessed.DBS of the PPTg induced strong ipsilateral c-Fos expression at the stimulation site, with 25 Hz having a more marked impact than 130 Hz. Additionally, c-Fos was strongly expressed in the central gray. In the dorsal part expression was stronger after 25 Hz stimulation, while in the medial and ventral part there was no difference between 25 Hz and 130 Hz stimulation. Expression in the basal ganglia was negligible.In the rat 6-OHDA PD model stimulation of the PPTg did not affect c-Fos expression in the basal ganglia, but had a strong impact on other functional circuitries. PPN stimulation in humans might therefore also have an impact on other systems than the motor system. |
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Keywords: | Abbreviations: ANOVA, analysis of variance AP, anterior&ndash posterior BSA, bovine serum albumin CG, central gray DAB, diaminobenzidin DBS, deep brain stimulation EPN, entopeduncular nucleus GPi, globus pallidus internus L, lateral NGS, normal goat serum PBS, phosphate buffered saline PD, Parkinson's disease PPN, pedunculopontine nucleus PPTg, pedunculopontine tegmental nucleus SN, substantia nigra STN, subthalamic nucleus TH, tyrosine hydroxylase V, ventral |
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