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Wang Q, Chen S, Li T, Yang Q, Liu J, Tao Y, Meng Y, Chen J, Feng X, Han Z, Shi M, Huang H, Han M, Jiang E. Critical Role of Lkb1 in the Maintenance of Alveolar Macrophage Self-Renewal and Immune Homeostasis. Front Immunol 2021; 12:629281. [PMID: 33968022 PMCID: PMC8100336 DOI: 10.3389/fimmu.2021.629281] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2020] [Accepted: 04/01/2021] [Indexed: 01/27/2023] Open
Abstract
Alveolar macrophages (AMs) are pivotal for maintaining lung immune homeostasis. We demonstrated that deletion of liver kinase b1 (Lkb1) in CD11c+ cells led to greatly reduced AM abundance in the lung due to the impaired self-renewal of AMs but not the impeded pre-AM differentiation. Mice with Lkb1-deficient AMs exhibited deteriorated diseases during airway Staphylococcus aureus (S. aureus) infection and allergic inflammation, with excessive accumulation of neutrophils and more severe lung pathology. Drug-mediated AM depletion experiments in wild type mice indicated a cause for AM reduction in aggravated diseases in Lkb1 conditional knockout mice. Transcriptomic sequencing also revealed that Lkb1 inhibited proinflammatory pathways, including IL-17 signaling and neutrophil migration, which might also contribute to the protective function of Lkb1 in AMs. We thus identified Lkb1 as a pivotal regulator that maintains the self-renewal and immune function of AMs.
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MESH Headings
- AMP-Activated Protein Kinases
- Animals
- Asthma/enzymology
- Asthma/genetics
- Asthma/immunology
- CD11 Antigens/genetics
- CD11 Antigens/metabolism
- Cell Self Renewal
- Disease Models, Animal
- Homeostasis
- Interleukin-17/genetics
- Interleukin-17/metabolism
- Lung/enzymology
- Lung/immunology
- Lung/microbiology
- Macrophages, Alveolar/enzymology
- Macrophages, Alveolar/immunology
- Macrophages, Alveolar/microbiology
- Mice, Inbred C57BL
- Mice, Knockout
- Neutrophil Infiltration
- Pneumonia, Bacterial/enzymology
- Pneumonia, Bacterial/genetics
- Pneumonia, Bacterial/immunology
- Pneumonia, Bacterial/microbiology
- Protein Serine-Threonine Kinases/genetics
- Protein Serine-Threonine Kinases/metabolism
- Signal Transduction
- Staphylococcal Infections/enzymology
- Staphylococcal Infections/genetics
- Staphylococcal Infections/immunology
- Staphylococcal Infections/microbiology
- Transcriptome
- Mice
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Affiliation(s)
- Qianqian Wang
- State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
| | - Song Chen
- State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
| | - Tengda Li
- State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
| | - Qiongmei Yang
- Department of Hematology, The First Affiliated Hospital of Kunming Medical University, Hematology Research Center of Yunnan Province, Kunming, China
| | - Jingru Liu
- Central Laboratory, Fujian Medical University Union Hospital, Fuzhou, China
| | - Yuan Tao
- State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
| | - Yuan Meng
- State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
| | - Jiadi Chen
- Central Laboratory, Fujian Medical University Union Hospital, Fuzhou, China
| | - Xiaoming Feng
- State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
| | - Zhongchao Han
- State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
| | - Mingxia Shi
- Department of Hematology, The First Affiliated Hospital of Kunming Medical University, Hematology Research Center of Yunnan Province, Kunming, China
| | - Huifang Huang
- Central Laboratory, Fujian Medical University Union Hospital, Fuzhou, China
| | - Mingzhe Han
- State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
| | - Erlie Jiang
- State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China
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Bessich JL, Nymon AB, Moulton LA, Dorman D, Ashare A. Low levels of insulin-like growth factor-1 contribute to alveolar macrophage dysfunction in cystic fibrosis. THE JOURNAL OF IMMUNOLOGY 2013; 191:378-85. [PMID: 23698746 DOI: 10.4049/jimmunol.1300221] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Alveolar macrophages are major contributors to lung innate immunity. Although alveolar macrophages from cystic fibrosis (CF) transmembrane conductance regulator(-/-) mice have impaired function, no study has investigated primary alveolar macrophages in adults with CF. CF patients have low levels of insulin-like growth factor 1 (IGF-1), and our prior studies demonstrate a relationship between IGF-1 and macrophage function. We hypothesize that reduced IGF-1 in CF leads to impaired alveolar macrophage function and chronic infections. Serum and bronchoalveolar lavage (BAL) samples were obtained from eight CF subjects and eight healthy subjects. Macrophages were isolated from BAL fluid. We measured the ability of alveolar macrophages to kill Pseudomonas aeruginosa. Subsequently, macrophages were incubated with IGF-1 prior to inoculation with bacteria to determine the effect of IGF-1 on bacterial killing. We found a significant decrease in bacterial killing by CF alveolar macrophages compared with control subjects. CF subjects had lower serum and BAL IGF-1 levels compared with healthy control subjects. Exposure to IGF-1 enhanced alveolar macrophage macrophages in both groups. Finally, exposing healthy alveolar macrophages to CF BAL fluid decreased bacterial killing, and this was reversed by the addition of IGF-1, whereas IGF-1 blockade worsened bacterial killing. Our studies demonstrate that alveolar macrophage function is impaired in patients with CF. Reductions in IGF-1 levels in CF contribute to the impaired alveolar macrophage function. Exposure to IGF-1 ex vivo results in improved function of CF alveolar macrophages. Further studies are needed to determine whether alveolar macrophage function can be enhanced in vivo with IGF-1 treatment.
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Affiliation(s)
- Jamie L Bessich
- Section of Pulmonary and Critical Care Medicine, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756, USA
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Ibarra C, Estrada M, Carrasco L, Chiong M, Liberona JL, Cardenas C, Díaz-Araya G, Jaimovich E, Lavandero S. Insulin-like growth factor-1 induces an inositol 1,4,5-trisphosphate-dependent increase in nuclear and cytosolic calcium in cultured rat cardiac myocytes. J Biol Chem 2003; 279:7554-65. [PMID: 14660553 DOI: 10.1074/jbc.m311604200] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
In the heart, insulin-like growth factor-1 (IGF-1) is a pro-hypertrophic and anti-apoptotic peptide. In cultured rat cardiomyocytes, IGF-1 induced a fast and transient increase in Ca(2+)(i) levels apparent both in the nucleus and cytosol, releasing this ion from intracellular stores through an inositol 1,4,5-trisphosphate (IP(3))-dependent signaling pathway. Intracellular IP(3) levels increased after IGF-1 stimulation in both the presence and absence of extracellular Ca(2+). A different spatial distribution of IP(3) receptor isoforms in cardiomyocytes was found. Ryanodine did not prevent the IGF-1-induced increase of Ca(2+)(i) levels but inhibited the basal and spontaneous Ca(2+)(i) oscillations observed when cardiac myocytes were incubated in Ca(2+)-containing resting media. Spatial analysis of fluorescence images of IGF-1-stimulated cardiomyocytes incubated in Ca(2+)-containing resting media showed an early increase in Ca(2+)(i), initially localized in the nucleus. Calcium imaging suggested that part of the Ca(2+) released by stimulation with IGF-1 was initially contained in the perinuclear region. The IGF-1-induced increase on Ca(2+)(i) levels was prevented by 1,2-bis(2-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid-AM, thapsigargin, xestospongin C, 2-aminoethoxy diphenyl borate, U-73122, pertussis toxin, and betaARKct (a peptide inhibitor of Gbetagamma signaling). Pertussis toxin also prevented the IGF-1-dependent IP(3) mass increase. Genistein treatment largely decreased the IGF-1-induced changes in both Ca(2+)(i) and IP(3). LY29402 (but not PD98059) also prevented the IGF-1-dependent Ca(2+)(i) increase. Both pertussis toxin and U73122 prevented the IGF-1-dependent induction of both ERKs and protein kinase B. We conclude that IGF-1 increases Ca(2+)(i) levels in cultured cardiac myocytes through a Gbetagamma subunit of a pertussis toxin-sensitive G protein-PI3K-phospholipase C signaling pathway that involves participation of IP(3).
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Affiliation(s)
- Cristian Ibarra
- Departament de Bioquímica y Biología Molecular, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago
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Huang CY, Hao LY, Buetow DE. Insulin-like growth factor-induced hypertrophy of cultured adult rat cardiomyocytes is L-type calcium-channel-dependent. Mol Cell Biochem 2002; 231:51-9. [PMID: 11952165 DOI: 10.1023/a:1014432923220] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The insulin-like growth factors-I and -II are potent growth stimulators in vivo and for many different cultured cells in vitro. Here IGF-I and -II are shown to directly induce hypertrophy of adult rat ventricular cardiomyocytes in serum-free medium as demonstrated by their increased size, total protein synthesis, and transcription of muscle-specific genes. The cells hypertrophied within 1 day when exposed to as little as 10(-11) M IGF-I or 10(-10) M IGF-II. With 10(-8) M IGF-I, cell size was significantly increased 34% by 1 day of culture and 57% by 2 days. With 10(-8) M IGF-II, cell size was similarly increased 32% by day 1 and 57% by 2 days. During hypertrophy, total protein synthesis was increased 2.3-fold with IGF-I and 2-fold with IGF-II. Gene expression for myosin light chain 2 and troponin I was upregulated with either growth factor. Hypertrophy induced by IGF-I was blocked by IGF binding protein-3, which binds IGF-I, while that induced by IGF-II was blocked by antibodies against IGF-II. Nicardipine, an inhibitor of L-type Ca2+-channels, completely blocked the hypertrophy induced by either IGF showing for the first time that such voltage-dependent channels are necessary for the hypertrophic effects of the IGFs on adult cardiomyocytes.
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Affiliation(s)
- Chih-Yang Huang
- Department of Molecular and Integrative Physiology, University of Illinois, Urbana 61801, USA
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