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• W3175749917 abstract "The pathophysiological mechanisms of pain in small fiber neuropathy (SFN) are unclear. Based on experimental and clinical studies, sensitized nociceptors in the skin are reported to be involved in pain development. These nociceptors may be sensitized by cutaneous and systemic pain mediators e.g. pro- and anti-inflammatory cytokines. The aim of our study was, to measure the systemic and local gene expression of pro- and anti-inflammatory cytokines in white blood cells (WBC) as well as in primary fibroblasts and keratinocytes obtained from human skin of patients with SFN. Furthermore, gene expression levels of axon guidance molecules and their receptors, as potential regulators of the intraepidermal nerve fiber density (IENFD), were investigated. 55 patients and 31 healthy controls were prospectively recruited. Participants underwent extensive clinical phenotyping and blood sampling, 6-mm skin punch biopsies were taken from the right lateral calf and the upper thigh. Systemic relative gene expression levels (ΔG) of the interleukin (IL)-1β, IL-2, IL-6, IL-8, and tumor necrosis factor (TNF) was measured in WBC. Skin punch biopsies were taken to determine the IENFD and to obtain primary fibroblast and keratinocyte cell cultures. Skin cells were then used for investigation of ΔG in axon guidance molecules netrin 1 (NTN1) and ephrin A4 (EPHA4) as well as their receptors Unc5b receptor, and ephrin A4 (EFNA4) as well as cytokines IL-1β, IL-4, IL-6, IL-8, IL-10, TNF, and transforming growth factor (TGF). Systemically, gene expression of IL-2, IL-8, and TNF was higher in SFN patients compared to healthy controls. In keratinocytes, higher expression levels of NTN1 and TGF were found when comparing the SFN patients to the controls. In fibroblasts higher gene expression was shown in NTN1, Unc5b, IL-6, and IL-8 when comparing patients to healthy controls. The systemically and local elevated levels of pro-inflammatory, algesic cytokines in SFN patients compared to healthy controls, confirms a potential pathophysiological role in the development of neuropathic pain. Data also indicate fibroblasts and keratinocytes to influence subepidermal and intraepidermal nerve fiber growth through the expression of NTN1 and Unc5b. Thus, skin cells may contribute to the development of neuropathic pain through local denervation." @default.
• W3175749917 created "2021-07-05" @default.
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• W3175749917 date "2020-01-01" @default.
• W3175749917 modified "2023-09-23" @default.
• W3175749917 title "Determination of cytokine and axon guidance molecule profiles in patients with small fiber neuropathy" @default.
• W3175749917 doi "https://doi.org/10.25972/opus-20911" @default.
• W3175749917 hasPublicationYear "2020" @default.
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