LPAR1 and rheumatoid arthritis: Multiple signalling pathways including cell cycle arresting signalling, apoptosis‐mediating pathways, PI3K/Akt, Wnt1/β‐catenin, AMPK/lipogenesis and LPA/LPA1/ERK/p38 MAPK, CST and BUT are the common molecular targets of berberine in RA disorder, which can be considered as the efficient therapeutic target for managing RA.