한빛사논문
- 조회290
Hyeong Seok An1*, Jung-Wan Yoo2*, Jong Hwan Jeong2, Manbong Heo2, Si Hwan Hwang3, Hye Min Jang1, Eun Ae Jeong1, Jaewoong Lee1, Hyun Joo Shin1, Kyung Eun Kim1, Meong Cheol Shin4, Gu Seob Roh1
1. Department of Anatomy & Convergence Medical Science, College of Medicine, Institute of Health Sciences, Gyeongsang National University, Jinju, 52727, Republic of Korea
2. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, College of Medicine, Gyeongsang National University Hospital, Gyeongsang National University, Jinju, 52727, Republic of Korea
3. Department of Medicine, College of Medicine, Gyeongsang National University, Jinju, 52727, Republic of Korea
4. College of Pharmacy, Research Institute of Pharmaceutical Sciences, Gyeongsang National University, Jinju, 52828, Republic of Korea
*These authors contributed equally to this work.
Corresponding author: Gu Seob Roh, M.D., Ph.D.
Abstract
Lipocalin-2 (LCN2) is an acute-phase protein that regulates inflammatory responses to bacteria or lipopolysaccharide (LPS). Although the bacteriostatic role of LCN2 is well studied, the function of LCN2 in acute lung damage remains unclear. Here, LCN2 knockout (KO) mice were used to investigate the role of LCN2 in LPS-treated mice with or without recombinant LCN2 (rLCN2). In addition, we employed patients with pneumonia. RAW264.7 cells were given LCN2 inhibition or rLCN2 with or without iron chelator deferiprone. LCN2 KO mice had a higher survival rate than wild-type (WT) mice after LPS treatment. In addition to elevated LCN2 levels in serum and bronchoalveolar lavage fluid (BALF), LPS treatment also increased LCN2 protein in alveolar macrophage lysates of BALF. LCN2 deletion attenuated neutrophil and macrophage infiltration in the lungs of LPS-treated mice as well as serum and BALF interleukin-6 (IL-6). Circulating proinflammatory cytokines and LCN2-positive macrophages were prominently increased in the BALF of pneumonia patients. In addition to increase of iron-stained macrophages in pneumonia patients, increased iron-stained macrophages and oxidative stress in LPS-treated mice were inhibited by LCN2 deletion. In contrast, rLCN2 pretreatment aggravated lung inflammation and oxidative stress in LPS-treated WT mice and then resulted in higher mortality. In RAW264.7 cells, exogenous LCN2 treatment also increased inflammation and oxidative stress, whereas LCN2 knockdown markedly diminished these effects. Furthermore, deferiprone inhibited inflammation, oxidative stress, and phagocytosis in RAW264.7 cells with high LCN2 levels, as well as LPS-induced acute lung injury in WT and LCN2 KO mice. Thus, these findings suggest that LCN2 plays a key role in inflammation and oxidative stress following acute lung injury and that LCN2 is a potential therapeutic target for pneumonia or acute lung injury.
논문정보
- Research article
- 2023년 02월 (BRIC 등록일 2023-03-17)
- 국내 연구진
- 의약학 > 인체시스템의학
댓글 작성 로그인
팝업 닫기관련 링크
연구자 키워드
연구자 ID
관련분야 연구자보기
소속기관 논문보기
관련분야 논문보기
해당논문 저자보기
