Abstract:
Objective
To investigate the association between serum 25(OH)D levels and islet β-cell function in type 2 diabetes mellitus (T2DM) patients,and assess the therapeutic effects of vitamin D (VD) supplementation on pancreatic islet function in VD-deficient T2DM subjects,with the objective of establishing an evidence-based treatment approach.
Methods
A total of 440 patients with T2DM who met the inclusion and exclusion criteria were selected from the Department of Endocrinology,The First Affiliated Hospital of Xinjiang Medical University.General clinical data and biochemical parameters were collected,and the 2-hour C-peptide to fasting C-peptide ratio (2hC-P/C-P) was calculated to assess pancreatic islet function.The patients were stratified into three groups based on VD levels,and differences in clinical indicators among the groups were compared,followed by correlation analysis.Additionally,48 T2DM patients were followed after VD supplementation to evaluate changes in islet function before and after intervention.
Results
Among the three groups with varying VD levels,fasting blood glucose (FBG),2-hour postprandial blood glucose (2hPG),and hemoglobin A1c (HbA1c) progressively decreased,while 2hC-P/C-P increased with higher VD levels,with statistically significant differences (P<0.05).Both Spearman correlation analysis and partial correlation analysis demonstrated significant associations between 25(OH)D levels and islet β-cell function as well as glycemic control (P<0.05).After VD supplementation,FBG,2hPG,and HbA1c decreased,whereas 2hC-P/C-P increased compared to baseline,with all changes being statistically significant (P<0.05).
Conclusion
VD levels influence islet β-cell function in T2DM patients.Supplementation with VD in VD-deficient individuals may improve β-cell function and glycemic control.Therefore,routine screening of VD levels should be incorporated into T2DM management,and VD supplementation should be considered alongside conventional glucose-lowering therapies.
Key words:
Vitamin D,
Type 2 diabetes,
Supplementation with vitamin D,
Pancreatic islet function,
Insulin resistance,
Blood glucose metabolism,
C-peptide levels
Nan Qin, Chuan Wang, Sheng Jiang. Correlation between vitamin D levels and islet function in type 2 diabetic patients[J]. Chinese Journal of Clinicians(Electronic Edition), 2025, 19(03): 199-205.