Ischemia-reperfusion injury is a common early complication after
lung transplantation. It was reported that
long non-coding RNA (
lncRNA)
metastasis-associated
lung adenocarcinoma transcript 1 (MALAT1) is involved in
ischemia-reperfusion injury and regulates
inflammation. This study aimed to explore the role of MALAT1 in inflammatory injury following lung transplant
ischemia-reperfusion (LTIR). A LTIR rat model was successfully established, with the expression of MALAT1 and
interleukin-8 (IL-8) in lung tissues detected. Then, in vitro loss- and gain-of-function investigations were conducted to evaluate the effect of MALAT1 on pulmonary epithelial cell apoptosis and
IL-8 expression. The relationship among MALAT1, p300, and
IL-8 was tested. Moreover, a sh-MALAT1-mediated model of LTIR was established in vivo to examine inflammatory injury and chemotaxis infiltration. Both
IL-8 and MALAT1 were highly expressed in LTIR. MALAT1 interacted with p300 to regulate the
IL-8 expression by recruiting p300. Importantly, silencing of MALAT1 inhibited the chemotaxis of neutrophils by downregulating
IL-8 expression via binding to p300. Besides, MALAT1 silencing alleviated the inflammatory injury after LTIR by downregulating
IL-8 and inhibiting infiltration and activation of neutrophils. Collectively, these results demonstrated that silencing of MALAT1 ameliorated the inflammatory injury after LTIR by inhibiting chemotaxis of neutrophils through p300-mediated downregulation of
IL-8, providing clinical insight for LTIR injury.