Differential associations between selenoprotein P and distal sensorimotor polyneuropathy in people with and without diabetes: KORA F4/FF4 study

• Published in: Free radical biology & medicine Vol. 223; pp. 87 - 95
• Main Authors: Herder, Christian, Saito, Yoshiro, Spagnuolo, Maria C., Maalmi, Haifa, Shimizu, Misaki, Bönhof, Gidon J., Suzuki, Keita, Rathmann, Wolfgang, Peters, Annette, Roden, Michael, Ziegler, Dan, Thorand, Barbara, Takamura, Toshinari
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.10.2024
• Subjects: Antioxidant; Biomarker; Distal sensorimotor polyneuropathy; Oxidative stress; Reductive stress; Selenoprotein P; Reductive stress; Oxidative stress; Biomarker; Distal sensorimotor polyneuropathy; Antioxidant; Selenoprotein P
• ISSN: 0891-5849; 1873-4596; 1873-4596
• DOI: 10.1016/j.freeradbiomed.2024.07.028

Oxidative stress is a risk factor for distal sensorimotor polyneuropathy (DSPN). Selenoprotein P is a protein with antioxidant properties but has not been investigated in the context of DSPN. This study aimed to assess the associations between selenoprotein P and DSPN in people without and with type 2 diabetes (T2D). Cross-sectional and prospective analyses were based on 1053 (including 217 with T2D) and 513 participants (including 79 with T2D), respectively, aged 61–82 years from the population-based KORA F4 survey. DSPN at baseline (KORA F4) and in the follow-up survey KORA FF4 was defined based on the Michigan Neuropathy Screening Instrument. Serum levels of full-length selenoprotein P were quantified by ELISA. Associations between selenoprotein P and prevalent or incident DSPN were estimated using logistic regression analysis adjusting for multiple confounders. Selenoprotein P levels were not associated with prevalent DSPN in the total sample. However, there was a significant interaction by diabetes status. Higher levels of selenoprotein P were associated with lower odds of prevalent DSPN in individuals without T2D (fully adjusted model: OR 0.825 [95 % CI 0.682, 0.998], p = 0.0476), but not in those with T2D (OR [95 % CI] 1.098 [0.829, 1.454], p = 0.5132; pinteraction = 0.0488). Selenoprotein P levels were not associated with incident DSPN over a follow-up of 6.5 years. In individuals without T2D from the older general population, lower selenoprotein P levels were associated with a higher prevalence of DSPN. Whether the antioxidant properties of selenoprotein P are responsible for the observed associations remains to be elucidated in future research. [Display omitted] •Oxidative stress is a risk factor for distal sensorimotor polyneuropathy (DSPN).•Selenoprotein P (SeP) has antioxidant properties but its association with DSPN is unknown.•Lower serum SeP levels were associated with a higher prevalence of DSPN in people without diabetes.•In people with type 2 diabetes, this inverse association was not seen.