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• W1959703444 abstract "Pain medicine still lacks mechanism-specific biomarkers to guide diagnosis and treatment, and defective top-down modulation is an important factor in the pathophysiology of chronic pain conditions. Using modern analytical tools and advanced multivariate statistical analysis, the aim of this study was to revisit two classical potential biomarkers of pro- and anti-nociception in humans (substance P and beta-endorphin), focusing particularly on the cerebrospinal fluid (CSF).Cross-sectional, comparative, observational study.Patients with chronic, post-traumatic and/or post-surgical, neuropathic pain refractory to conventional treatment (N = 15) and healthy controls (N = 19) were included.Samples were taken from CSF and blood, and levels of substance P and beta-endorphin were investigated using a Luminex technology kit.We found low levels of beta-endorphin in the CSF of neuropathic pain patients (66 ± 11 pcg/mL) compared with healthy controls (115 ± 14 pcg/mL) (P = 0.017). Substance P levels in the CSF did not differ (20 ± 2 pcg/mL, 26 ± 2, P = 0.08). However, our multivariate data analysis showed that belonging to the patient group was associated with low levels of both substances in the CSF. A higher correlation between the levels of beta-endorphin and substance P in CSF was found in healthy controls than in patients (rs = 0.725, P < 0.001 vs. rs = 0.574, P = 0.032).Patients with chronic neuropathic pain due to trauma or surgery had low levels of beta-endorphin in the CSF. We speculate that this could indicate a defective top-down modulation of pain in chronic neuropathic pain. Our results also illustrate the importance of taking a system-wide, multivariate approach when searching for biomarkers." @default.
• W1959703444 created "2016-06-24" @default.
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• W1959703444 date "2014-01-01" @default.
• W1959703444 modified "2023-10-02" @default.
• W1959703444 title "Do Low Levels of Beta-Endorphin in the Cerebrospinal Fluid Indicate Defective Top-Down Inhibition in Patients with Chronic Neuropathic Pain? A Cross-Sectional, Comparative Study" @default.
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• W1959703444 doi "https://doi.org/10.1111/pme.12248" @default.
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