The Role of Discoidin Domain Receptor 1 in Inflammation, Fibrosis and Renal Disease.

Discoidin domain receptors (DDRs) are a family of 2 non-integrin collagen receptors, DDR1 and DDR2, which display a tyrosine kinase activity. They are mainly expressed during embryonic development and their role during adulthood is very limited. DDR1 has been widely studied in several types of cancers, in atherosclerosis and fibrosis, but also in chronic kidney disease (CKD). This review focuses on the role of DDR1 in chronic nephropathies and on the effect of its deletion in the pathological processes involved in renal disease progression. DDR1 was shown to be de novo expressed in several models of experimental CKD. Its genetic or pharmaco-genetic inhibition led to the preservation of renal structure and function, and to decreased inflammatory influx and fibrosis. Furthermore, delayed pharmaco-genetic inhibition of DDR1 led to significant protection in models of renal disease. These results demonstrate the involvement of DDR1 in inflammatory and fibrotic processes occurring during CKD and the beneficial effect of its inhibition. Thus, DDR1 could be an interesting therapeutic target to treat renal pathologies.