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T-Natural Killers and Interferon Gamma/Interleukin 4 in Augmentation of Infection in Foot Ulcer in Type 2 Diabetes

Abstract

Background: The link between immune system and type 2 diabetes mellitus (T2DM) pathogenesis attracted attention to demonstrate the role of immune cells and their secreted cytokines in T2DM development and its subsequent foot complications.

Objective: To investigate the relation between T Natural killer cell (TNK) %, Interleukin 4 (IL4) and Interferon gamma (IFN-γ) and diabetic foot infection (DFI) development in patients with diabetic foot ulcer (DFU).

Patients And Methods: Ninety patients with diabetes were included in this work, divided as T2DM group (n=30), DFU group (n=30), and DFI group (n=30). TNK% was detected using flow cytometry. Serum IL4 and IFN-γ were measured by ELISA. Diabetes biochemical parameters were also analyzed.

Results: Significant decrease was detected in TNK% and IFN-γ in DFI group compared to other 2 groups (<0.001). Significant decrease was detected in serum levels of IL4 in DFI group compared to T2DM group (=0.006). IFN-γ/IL4 was significantly decreased in DFI compared to DFU group (=0.020). There was a significant correlation of TNK% with both IL4 and IFN-γ (r=0.385, <0.001; r=0.534, <0.001, respectively). Significant negative correlation of TNK% with HbA1c and LDL was revealed (r=-0.631, <0.001; and r=-0.261, =0.013, respectively), while a positive correlation was seen with HDL (r=0.287, =0.006). A significant negative correlation of IL4 with HbA1c  was found (r=-0.514, <0.001;. As for IFN-γ, a significant negative correlation with HbA1c and LDL was detected (r=-0.369, < 0.001; r=-0.229, =0.030). TNK % and IFN-γ level showed negative correlations with disease duration/year (r=-0.546, < 0.001; r=-0.338, =0.001,respectively).

Conclusion: Decline in TNK frequency has essential role in T2DM pathogenesis and subsequent foot complications. Downregulation of TNK% and IFN-γ level have potential roles in predicting infection of diabetic ulcer and are correlated with disease duration.

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