Abstract
Aims
Spexin plays a role in regulating glucose metabolism. This study investigated the spexin levels in different glycemic status and its association with insulin secretion in humans.
Methods
A total of 462 subjects were recruited in this study, including 52 healthy subjects, 106 first-degree relatives (FDRs) of type 2 diabetes mellitus (T2DM), 115 impaired glucose regulation (IGR), 80 newly diagnosed T2DM, and 106 established T2DM. Serum spexin was measured using ELISA. The homeostasis model assessment of insulin resistance (HOMA2-IR) and β-cell function (HOMA2-β), and Stumvoll index estimating first- and second-phase insulin secretion were calculated.
Results
Spexin levels were higher in FDRs [235.53 pg/ml (185.28, 293.95)] and IGR [239.79 pg/ml (191.52, 301.69)], comparable in newly diagnosed T2DM [224.68 pg/ml (187.37, 279.74)], and lower in established T2DM [100.11 pg/ml (78.50, 137.34)], compared with healthy subjects [200.23 pg/ml (160.32, 275.65)]. Spexin levels were negatively correlated with fasting plasma glucose (FPG) (r = − 0.355, P < 0.001), hemoglobin A1C (HbA1c) (r = − 0.379, P < 0.001), and HOMA2-IR (r = − 0.225, P < 0.001), and positively correlated with HOMA2-β (r = 0.245, P < 0.001) after adjusting for age, sex, and BMI. Multivariate linear regression analysis showed that established T2DM and HOMA2-β were independently associated with serum spexin levels.
Conclusions
Serum spexin levels represented as a bell-shaped curve along the glycemic continuum and is closely related with insulin secretion in humans.
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Funding
This study was funded by the national nature science foundation of China (Grant Numbers 81200622).
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Dai, J., Ni, Y., Wu, D. et al. Circulating spexin levels are influenced by the glycemic status and correlated with pancreatic β-cell function in Chinese subjects. Acta Diabetol 60, 305–313 (2023). https://doi.org/10.1007/s00592-022-02010-x
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DOI: https://doi.org/10.1007/s00592-022-02010-x