Hepatocyte growth factor regulates HIF-1α-induced nucleus pulposus cell proliferation through MAPK-, PI3K/Akt-, and STAT3-mediated signaling. - Itsuji T; Tonomura H; Ishibashi H; Mikami Y; Nagae M; Takatori R; Tanida T; Matsuda KI; Tanaka M; Kubo T (Journal of orthopaedic research : official publication of the Orthopaedic Research Society, 2021)