Dengue virus and the complement alternative pathway

AbstractDengue disease is an inflammatory driven pathology and complement overactivation is linked to disease severity and vascular leakage. Additionally, dysregulation of complement alternative pathway (AP) components has been described, such as upregulation of complement factor D and downregulation of complement factor H (FH), which activate and inhibit the AP, respectively. Thus, the pathology of severe dengue could in part result from AP dysfunction, even though complement and AP activation usually provide protection against viral infections. In dengue virus ‐infected macrophages and endothelial cells (EC), the site of replication and target for vascular pathology respectively, the AP is activated. The AP activation, reduced FH and vascular leakage seen in dengue disease in part parallels other complement AP pathologies associated with FH deficiency, such as atypical haemolytic uremic syndrome (aHUS). aHUS can be therapeutically targeted with inhibitors of complement terminal activity, raising the idea that strategies such as inhibition of complement or delivery of FH or other complement regulatory components to EC may be beneficial to combat th e vascular leakage seen in severe dengue.

Source: FEBS Letters - January 13, 2020 Category: Biochemistry Authors: Jillian M Carr, Sheila Cabezas ‐Falcon, Joshua G Dubowsky, Jarrod Hulme‐Jones, David L Gordon Tags: REVIEW ARTICLE Source Type: research