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In recent years, there has been discussion that essential tremor (ET) might be a neurodegenerative disease. Indicators of inflammation are considered as possible biomarkers of neurodegeneration. In this connection, the aim of our study was to identify the relationship between serum inflammation markers and clinical features in ET, including the severity of tremor, cognitive decline, depression.The serum interleukin-1β (IL-1β), IL-6, IL-8, IL-10, and tumor necrosis factor-α (TNF-α) levels were measured in 90 ET patients and 90 healthy control people of the corresponding age and gender. Fahn-Tolosa-Marin scale was used for the severity of the tremor. Cognitive function was assessed using the MoCA. Affective symptoms were measured by the Beck Depression Inventory.ET patients had significantly lower serum TNF-α (Our findings demonstrate that neuroinflammation makes a certain contribution to the development of ET.

Background: Essential tremor (ET) and Parkinson's disease (PD) are the two most common movement disorders in adults with similar clinical symptoms, which is hinting towards existence of coincident pathogenesis steps.Objectives: The objective of this report is to characterize the relationship between ET and PD severity and the activity of calcium-dependent proteases calpain in plasma.Methods: The study enrolled 12 volunteers for each condition: ET, PD, healthy. We evaluated the stage of PD on the H&Y scale in patients with PD, and the severity of tremor in patients with ET on the FTMS scale. IL-1β, TNFα, IL6, IL10 were determined in plasma using ELISA. Calpain activity was measured using fluorescent substrate and zymography methods.Results: We demonstrated that the activity of calpains in plasma of patients with PD and ET increased 5.1 and 4.3 times, respectively. The increase of calpain activity in plasma of PD patients correlated with the content of IL-1β, for ET such a connection was not found. At the advanced stages of PD calpain activity in plasma was significantly higher than that of the PD group at the early stage, and this increase was mediated by the increase in m-calpain activity. The increase in the tremor severity in ET did not lead to an increase in the activity of calpains in plasma.Conclusions: We observed general increase in the activity of calpains in plasma of both PD and ET patients that hints towards presence of the common steps in the pathogenesis of these diseases.