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Secreted Frizzled-Related Protein 4 (SFRP4) is Elevated in Patients with Diabetes Mellitus
J M Brix1, E C Krzizek1, C Hoebaus2
1Department of Medicine I, Rudolfstiftung Hospital Vienna, Vienna, Austria.
Abstract:
Recently, SFRP4 was identified as a molecular link between islet inflammation and defective insulin secretion. Gene co-expression analysis detected a molecule associated with type 2 diabetes mellitus (T2D), elevated HbA1c, and reduced insulin secretion in mice as well as in a pilot sample of humans. To our knowledge SFRP4 has never been investigated in patients with different types of diabetes. We included 179 patients: 46 with type 1 diabetes (T1D), 30 age matched healthy controls for patients with T1D (CO-T1D), 55 with T2D, 37 with latent autoimmune diabetes of the adult (LADA) and 30 healthy controls (CO) for patients with T2D and LADA. Apart from anthropometric data, lipids and renal parameters were assessed. SFRP4 levels were measured by a commercial ELISA. Patients with diabetes had significant higher SFRP4 levels than CO: T2D vs. CO: 37.1±26.7 vs. 8.8±3.0 ng/ml, p<0.001; LADA vs. CO: 15.6±6.2 vs. 8.7±3.0 ng/ml, p<0.001; T1D vs. CO-T1D: 24.6±17.9 vs. 16.9±4.5 ng/ml, p=0.011. SFRP4 levels were correlated with age, BMI, HbA1c, HDL-cholesterol, and triglycerides. A multivariate model revealed HDL-cholesterol, triglycerides and BMI as predictors for SFRP4. This is the first study demonstrating that SFRP4 is significantly increased in patients with different types of diabetes suggesting that this protein is generally involved in islet dysfunction and potentially subclinical inflammation irrespective of type of diabetes.
Insights
Secreted frizzled-related protein 4 (SFRP4) is elevated in patients with type 1 diabetes, type 2 diabetes, and latent autoimmune diabetes in adults. This suggests SFRP4 may indicate general islet dysfunction and inflammation across diabetes types.
Area of Science:
- Endocrinology
- Metabolic Diseases
- Molecular Biology
Background:
- Secreted frizzled-related protein 4 (SFRP4) has been linked to islet inflammation and impaired insulin secretion.
- Previous studies suggest SFRP4 is associated with type 2 diabetes (T2D), elevated HbA1c, and reduced insulin secretion.
- SFRP4 has not been previously investigated across various diabetes types.
Purpose of the Study:
- To investigate SFRP4 levels in patients with type 1 diabetes (T1D), T2D, and latent autoimmune diabetes in adults (LADA).
- To determine if SFRP4 levels differ between diabetic patients and healthy controls.
- To explore correlations between SFRP4 levels and clinical parameters in diabetes patients.
Main Methods:
- SFRP4 levels were measured using ELISA in 179 patients (46 T1D, 55 T2D, 37 LADA) and their respective controls.
- Anthropometric data, lipids, and renal parameters were assessed.
- Multivariate analysis was used to identify predictors of SFRP4 levels.
Main Results:
- Patients with T2D, LADA, and T1D exhibited significantly higher SFRP4 levels compared to healthy controls.
- SFRP4 levels showed correlations with age, BMI, HbA1c, HDL-cholesterol, and triglycerides.
- Multivariate analysis identified HDL-cholesterol, triglycerides, and BMI as predictors of SFRP4.
Conclusions:
- SFRP4 is significantly elevated in patients across different diabetes types (T1D, T2D, LADA).
- Increased SFRP4 suggests a general role in islet dysfunction and subclinical inflammation, irrespective of diabetes type.
- SFRP4 may serve as a potential biomarker for islet dysfunction in diabetes.
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