• J Pain · Feb 2025

    Fibromyalgia patients have altered lipid concentrations associated with disease symptom severity and anti-satellite glial cell IgG antibodies.

    • Jenny E Jakobsson, Joana Menezes, Emerson Krock, Matthew A Hunt, Henrik Carlsson, Aina Vaivade, Payam Emami Khoonsari, Nilesh M Agalave, Angelica Sandström, Diana Kadetoff, Jeanette Tour Sohlin, Ida Erngren, Asma Al-Grety, Eva Freyhult, Katalin Sandor, Eva Kosek, Camilla I Svensson, and Kim Kultima.
    • Department of Medical Sciences, Uppsala University, Uppsala, Sweden; Department of Surgical Sciences, Uppsala University, Uppsala, Sweden.
    • J Pain. 2025 Feb 6; 29: 105331105331.

    AbstractAutoimmunity and immunoglobulin G (IgG) autoantibodies may contribute to pain in a subset of fibromyalgia (FM) patients. Previously, IgG from FM patients was found to induce pain-like behavior in mice and bind to satellite glial cells (anti-SGC IgG). The anti-SGC IgG levels were also associated with more severe symptomatology. Lipid metabolism in FM subjects is altered with lysophosphatidylcholines (LPCs) acting as pain mediators. The relationship between autoantibodies, lipid metabolism, and FM symptomatology remains unclear. Serum lipidomics with liquid chromatography mass spectrometry, anti-SGC IgG levels, and clinical measures were examined in 35 female FM subjects and 33 age- and body mass index-balanced healthy controls (HC). Fibromyalgia subjects with higher anti-SGC IgG levels experienced more intense pain than those with lower levels. Sixty-three lipids were significantly altered between FM subjects and HC or between FM subjects with severe (FM severe) and mild symptoms (FM mild). Compared to HC, FM subjects had lower concentrations of lipid species belonging to the classes LPC (n = 10), lysophosphatidylethanolamine (n = 7), phosphatidylcholine (n = 4), and triglyceride (n = 5), but higher concentrations of diglyceride (n = 3). Additionally, FM severe had higher LPC 19:0, 22:0, and 24:1 and lower sphingomyelin (n = 9) concentrations compared to FM mild. Positive associations were seen for LPC 22:0 and 24:1 with pain intensity and anti-SGC IgG levels in FM subjects. Taken together, these results suggest an association between altered lipid metabolism and autoimmune mechanisms in FM.Copyright © 2025 The Authors. Published by Elsevier Inc. All rights reserved.

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