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    Fatty Acids of Erythrocyte Membranes and Blood Serum as Possible Predictors of Exacerbation in Patients with Inflammatory Bowel Diseases by M. V. Kruchinina, M. F. Osipenko, A. I. Valuyskikh, E. Yu. Valuiskikh, I. O. Svetlova

    Published 2025-02-01
    “…The study of the composition of fatty acids (FAs) in the membranes of erythrocytes and blood serum was carried out using a gas chromatograph mass spectrometry system based on three quadrupoles Agilent 7000B (Agilent Technologies Inc., USA).Results. In the acute stage, patients with IBD have a higher total content of saturated fatty acids (SFAs) in erythrocyte membranes compared to the control group (p = 0.006), and, on the contrary, lower levels of unsaturated fatty acids (UFAs) (p = 0.005), mainly due to polyunsaturated FAs (PUFAs) (p = 0.026), namely omega-6 PUFAs (p = 0.011).Remission of IBD is associated with an increase in the level of a number of SFAs in the blood serum — margaric C17:0 (p = 0.024), arachidic acid (C20:0) — in erythrocyte membranes and serum (p = 0.0001 and p = 0.019, respectively), with a decrease in the total content of monounsaturated FAs in erythrocyte membranes (p = 0.022), an increase in the total concentration of PUFAs due to both omega-3 PUFAs (p = 0.0008) and omega-6 PUFAs (p = 0.033) in erythrocyte membranes compared with a group of healthy individuals.The exacerbation stage in patients with IBD examined over time is associated with higher levels of stearic FA C18:0 (p = 0.005), SFA/UFA (p = 0.034) and SFA/PUFA (p = 0.039) ratios in erythrocyte membranes, serum level of arachidic FA C20:0 (p = 0.008), and, on the contrary, lower content of UFAs in erythrocyte membranes — eicosapentaenoic C20:5n-3 (p = 0.0023), eicosadienoic C20:2n-6 (p = 0.0027), hexadecadienoic C16:2n-6 (p = 0.006), docosatetraenoic C22:4n-6 (p = 0.008) and alpha-linolenic C18:3n-3 (p = 0.039).A combined “panel” of fatty acids, including the levels of C20:2n-6, C18:0 in erythrocyte membranes and the content of C20:0 in blood serum, provided an AUC of 0.683 (95 % CI: 0.500–0.844), sensitivity 91.4 %, specificity 68.3 %.Levels of C20:5n-3, C20:2n-6, C18:0, C16:2n-6, C22:4n-6, C18:3n-3 fatty acids, SFA/UFA and SFA/PUFA ratios in erythrocyte membranes and content C20:0 in blood serum, used as biomarkers — predictors of the development of exacerbation in patients with IBD who were in remission, predicted the development of exacerbation of IBD after 2–4 months in the case of maximally changed levels of FAs, after 6–8 months — with moderately changed levels FAs, maintaining remission for 12 months — with minimally changed FAs levels.Conclusion. …”
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