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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 ( p  &lt; 0.01) but higher serum IL-8 ( p  &lt; 0.02) and IL-10 ( p  &lt; 0.01) levels compared to the control patients. The severity of tremor positively correlated with the serum IL-8 level,  R  = 0.3 ( p  &lt; 0.01). The serum IL-6 level was higher in ET patients with cognitive impairment compared with normal cognitive ability ( p  &lt; 0.01). ROC analysis showed that an IL-8 level of 4 pg/ml and higher related with a high risk of severe tremor in ET (AUC-ROC = 0.761). Our findings demonstrate that neuroinflammation makes a certain contribution to the development of ET.

international journal of neuroscience

The relationship between serum interleukin-1β, interleukin-6, interleukin-8, interleukin-10, tumor necrosis factor-α levels and clinical features in essential tremor