Reduced Circulating Angiopoietin-Like Protein Levels in Crimean-Congo Hemorrhagic Fever

Area of Science:

• Virology and Infectious Diseases
• Molecular Biology and Biochemistry
• Vascular Biology and Medicine

Background:

• Crimean-Congo Hemorrhagic Fever (CCHF) is a severe zoonotic disease with significant endothelial dysfunction and coagulopathy.
• Angiopoietin-like proteins (ANGPTLs) are crucial regulators of vascular integrity, lipid metabolism, and inflammation.
• The specific role of ANGPTLs in CCHF pathogenesis and their potential as biomarkers are not well understood.

Purpose of the Study:

• To investigate the serum levels of six ANGPTL proteins (ANGPTL1, ANGPTL2, ANGPTL3, ANGPTL4, ANGPTL6, ANGPTL8) in patients with laboratory-confirmed CCHF.
• To explore the correlation of ANGPTL levels with clinical and laboratory parameters of CCHF, including inflammation, coagulation, and metabolic markers.
• To evaluate the diagnostic and prognostic potential of ANGPTLs in CCHF, including their ability to predict mortality.

Main Methods:

• Prospective case-control study involving 60 CCHF patients and 30 healthy controls.
• Serum ANGPTL levels were quantified using enzyme-linked immunosorbent assay (ELISA).
• Standard laboratory parameters were analyzed, and correlations with ANGPTLs were assessed; Receiver Operating Characteristic (ROC) analysis was used for diagnostic and mortality discrimination.

Main Results:

• All measured ANGPTL levels were significantly reduced in CCHF patients compared to healthy controls.
• No significant differences in ANGPTL levels were found between CCHF survivors and non-survivors.
• While ANGPTL2 and ANGPTL3 showed statistically significant, albeit limited, mortality discrimination (low number of fatal cases).

Conclusions:

• Reduced serum ANGPTL levels are associated with inflammatory, endothelial, coagulation, and metabolic alterations in CCHF.
• The study does not support the use of ANGPTLs as prognostic markers for CCHF mortality.
• A causal role for ANGPTLs in CCHF pathogenesis could not be established based on these findings.