The Role of Ghrelin, Neuropeptide Y and Leptin Peptides in Weight Gain after Deep Brain Stimulation for Parkinson’s DiseaseMarkaki E.a · Ellul J.b · Kefalopoulou Z.a · Trachani E.b · Theodoropoulou A.c · Kyriazopoulou V.c · Constantoyannis C.a
aFunctional Neurosurgery Unit, Department of Neurosurgery, bDepartment of Neurology, and cEndocrinology Unit, Department of Internal Medicine, University of Patras, Rion, Greece
Assist. Prof. Constantine Constantoyannis
Functional Neurosurgery Unit
Department of Neurosurgery, University Hospital of Patras
GR–26 500 Rion (Greece)
Tel. +30 69 4474 6083, E-Mail firstname.lastname@example.org
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Background: The exact mechanism of weight gain (WG) after deep brain stimulation (DBS) of the subthalamic nucleus (STN) in patients with idiopathic Parkinson’s disease remains unknown. Objectives: To investigate a possible involvement of ghrelin, neuropeptide Y (NPY) and leptin in WG after DBS. Methods: Twenty-three Parkinson patients were submitted for body composition measurements and blood sampling 3 days before, and 3 and 6 months after STN DBS. Peripheral concentrations of ghrelin, NPY, and leptin were determined, as well as the L-dopa equivalent daily dose. Patients were clinically evaluated using the Unified Parkinson’s Disease Rating Scale. Results: Three months after surgery, a significant WG was observed (3.09 ± 5.00 kg; p = 0.007) with no further increase at 6 months. Three months postoperatively, NPY circulating levels increased significantly (p = 0.05), while the increase of ghrelin levels reached statistical significance at 6 months (p = 0.001). WG was significantly associated with changes of ghrelin and leptin levels at 3 and 6 months, respectively. Conclusions: STN DBS seems to temporarily dysregulate the hypothalamic secretion of NPY and ghrelin. The variation of weight may be attributed to an increased production of ghrelin and leptin. A possible neuroprotective role of DBS, exerted through the increase of ghrelin levels, should be further studied.
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