Synovial fibroblasts express two types of phospholipase D, PLD1 and PLD2.
PLD regulates production of pro-inflammatory cytokines by synovial fibroblasts.
In synovial organ cultures PLD inhibitors inhibit release of interleukins 6 and 8.
The effects of PLD are primarily post-transcriptional.
PLD inhibitors could be evaluated for clinical effects on inflammatory arthritis.