SPHK1 and autoimmune hepatitis: Quantitative real‐time polymerase chain reaction (qRT‐PCR) and Western blotting (WB) results revealed that MSCs treatment increased Sk1 transcription in intrahepatic macrophages during AS‐AIH, accompanied by reduced synthesis and phosphorylation levels of RIPK1, RIPK3, and MLKL (Figure 2E,F).