Thrombospondin-4 increases with the severity of peripheral arterial disease and is associated with diabetes
Bernhard Zierfuss1, Clemens Höbaus2, Carsten T Herz3
1Division of Angiology, Department of Internal Medicine 2, Medical University of Vienna, Währinger Gürtel 18-20, 1090, Vienna, Austria. bernhard.zierfuss@meduniwien.ac.at.
Insights
Thrombospondin-4 (TSP-4) is elevated in patients with peripheral artery disease (PAD), correlating with disease severity. This study suggests TSP-4 may serve as a novel biomarker for atherosclerosis, particularly in diabetic patients.
Area of Science:
- Cardiovascular Research
- Biomarker Discovery
- Atherosclerosis Research
Background:
- Thrombospondin-4 (TSP-4) is an extracellular matrix protein found in vessel walls.
- Its clinical significance in atherosclerosis, particularly peripheral artery disease (PAD), remains largely uncharacterized.
- Existing evidence primarily stems from preclinical studies, necessitating clinical validation.
Purpose of the Study:
- To investigate the clinical relevance of TSP-4 in patients with PAD.
- To determine the correlation between TSP-4 levels and PAD severity.
- To explore the association of TSP-4 with diabetes in the context of PAD.
Main Methods:
- TSP-4 levels were quantified using ELISA in 365 PAD patients.
- PAD diagnosis and severity grading were based on ankle-brachial index (ABI) and Fontaine classification.
- Statistical analyses included correlation, logistic regression, and ANOVA to assess TSP-4 associations with clinical parameters and glucose tolerance status.
Main Results:
- TSP-4 levels were significantly higher in patients with more severe PAD (Fontaine II vs. I) (p=0.043).
- TSP-4 showed a significant negative correlation with ABI (r=-0.141, p=0.023) after excluding specific patient subgroups.
- Elevated TSP-4 was observed in patients with type 2 diabetes mellitus or prediabetes (DGT) compared to normal glucose tolerance (NGT) (p=0.035), with a linear increase in TSP-4 with combined PAD and diabetes burden.
Conclusions:
- TSP-4 levels increase with PAD severity, indicating its potential as a marker for atherosclerotic activity.
- A novel association between TSP-4 and diabetes in PAD patients was identified.
- TSP-4 may represent a valuable biomarker for assessing atherosclerotic disease burden, especially in patients with co-existing diabetes.
Abstract:
Thrombospondin-4 (TSP-4) is an extracellular matrix protein of the vessel wall. Despite bench evidence, its significance in the clinical setting of atherosclerosis is missing. TSP-4 (ng/ml) was measured in 365 PAD patientsusing a commercially available ELISA. PAD was diagnosed by the ankle-brachial index (ABI) and clinically graded using the Fontaine classification. TSP-4 levels were significantly higher in Fontaine II vs. Fontaine I (4.78 ± 0. 42, 4.69 ± 0.42, p = 0.043). TSP-4 significantly correlated with ABI (r = - 0.141, p = 0.023, n = 259) after the exclusion of mediasclerotic patients. Binary logistic regression analysis for Fontaine I vs. II showed an OR of 1.70 (1.02-2.82) in a multivariable model adjusted for traditional risk factors. Interestingly, TSP-4 levels were higher in patients with type 2 diabetes mellitus or prediabetes (DGT) compared with normal glucose tolerance (NGT) (4.76 ± 0.42 vs. 4.66 ± 0.41, p = 0.035). ANOVA for PAD and diabetes subgroups showed a linear increase with disease burden with the highest difference between Fontaine I-NGT and Fontaine II-DGT (4.59 ± 0.40, 4.79 ± 0.43, p = 0.015). TSP-4 levels increased with PAD severity and showed a former unknown association with diabetes. Thus, TSP-4 could be a novel marker of atherosclerotic activity, especially in the major subgroup of patients with concomitant diabetes.
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