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Ni J, Chen X, Chen N, Yan Y, Wu Y, Li B, Huang H, Tong H, Liu Y, Dai N. Erianin alleviates LPS-induced acute lung injury via antagonizing P-selectin-mediated neutrophil adhesion function. JOURNAL OF ETHNOPHARMACOLOGY 2024; 331:118336. [PMID: 38750983 DOI: 10.1016/j.jep.2024.118336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2024] [Revised: 04/28/2024] [Accepted: 05/10/2024] [Indexed: 05/19/2024]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Dendrobium officinale Kimura et Migo, known as "Tiepi Shihu" in traditional Chinese medicine, boasts an extensive history of medicinal use documented in the Chinese Pharmacopoeia. "Shen Nong Ben Cao Jing" records D. officinale as a superior herbal medicine for fortifying "Yin" and invigorating the five viscera. Erianin, a benzidine compound, emerges as a prominent active constituent derived from D. officinale, with the pharmacological efficacy of D. officinale closely linked to the anti-inflammatory properties of erianin. AIM OF THE STUDY Acute lung injury (ALI) is a substantial threat to global public health, while P-selectin stands out as a promising novel target for treating acute inflammatory conditions. This investigation aims to explore the therapeutic potential of erianin in ALI treatment and elucidate the underlying mechanisms. EXPERIMENTAL DESIGN The effectiveness of erianin in conferring protection against ALI was investigated through comprehensive histopathological and biochemical analyses of lung tissues and bronchoalveolar lavage fluid (BALF) in an in vivo model of LPS-induced ALI in mice. The impact of erianin on fMLP-induced neutrophil chemotaxis was quantitatively assessed using the Transwell and Zigmond chamber, respectively. To determine the therapeutic target of erianin and elucidate their binding capability, a series of sophisticated assays were employed, including drug affinity responsive target stability (DARTS) assay, cellular thermal shift assay (CETSA), and molecular docking analyses. RESULTS Erianin demonstrated a significant alleviation of LPS-induced acute lung injury, characterized by reduced total cell and neutrophil counts and diminished total protein contents in BALF. Moreover, erianin exhibited a capacity to decrease proinflammatory cytokine production in both lung tissues and BALF. Notably, erianin effectively suppressed the activation of NF-κB signaling in the lung tissues of LPS- challenged mice; however, it did not exhibit in vitro inhibitory effects on inflammation in LPS-induced human pulmonary microvascular endothelial cells (HPMECs). Additionally, erianin blocked the adhesion and rolling of neutrophils on HPMECs. While erianin did not influence endothelial P-selectin expression or cytomembrane translocation, it significantly reduced the ligand affinity between P-selectin and P-selectin glycoprotein ligand-1 (PSGL-1). CONCLUSIONS Erianin inhibits P-selectin-mediated neutrophil adhesion to activated endothelium, thereby alleviating ALI. The present study highlights the potential of erianin as a promising lead for ALI treatment.
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Affiliation(s)
- Jiangwei Ni
- Department of Thoracic Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000, PR China
| | - Xiaohai Chen
- Department of Pharmacy, The Third Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325200, PR China
| | - Nengfu Chen
- Department of Thoracic Surgery, The Affiliated Cangnan Hospital of Wenzhou Medical University, Wenzhou, 325800, PR China
| | - Yawei Yan
- College of Pharmacy, Wenzhou Medical University, Wenzhou, 325000, PR China
| | - Yu Wu
- Zhejiang Provincial Key Laboratory for Water Environment and Marine Biological Resources Protection, College of Life and Environmental Science, Wenzhou University, Wenzhou, 325000, PR China
| | - Boyang Li
- Zhejiang Provincial Key Laboratory for Water Environment and Marine Biological Resources Protection, College of Life and Environmental Science, Wenzhou University, Wenzhou, 325000, PR China
| | - Hui Huang
- Department of Pharmacy, Wenzhou Hospital of Integrated Traditional Chinese and Western Medicine, Wenzhou, 325000, PR China
| | - Haibin Tong
- Zhejiang Provincial Key Laboratory for Water Environment and Marine Biological Resources Protection, College of Life and Environmental Science, Wenzhou University, Wenzhou, 325000, PR China; State Key Laboratory for Quality Ensurance and Sustainable Use of Dao-di Herbs, Beijing, 100700, PR China.
| | - Yu Liu
- Department of Thoracic Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000, PR China.
| | - Ningfeng Dai
- Department of Thoracic Surgery, The Affiliated Cangnan Hospital of Wenzhou Medical University, Wenzhou, 325800, PR China.
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Yu W, Li B, Chen L, Chen Q, Song Q, Jin X, Yin Y, Tong H, Xue L. Gigantol ameliorates DSS-induced colitis via suppressing β2 integrin mediated adhesion and chemotaxis of macrophage. JOURNAL OF ETHNOPHARMACOLOGY 2024; 328:118123. [PMID: 38554854 DOI: 10.1016/j.jep.2024.118123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Revised: 03/14/2024] [Accepted: 03/26/2024] [Indexed: 04/02/2024]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Dendrobium, recognized as "Shihu" in traditional Chinese medicine, holds a rich history of medicinal utilization documented in the Chinese Pharmacopoeia. Ancient texts like "Shen Nong Ben Cao Jing" extol Dendrobium's virtues as a superior herbal medicine fortifying "Yin" and invigorating the five viscera. Dendrobium is extensively employed for the treatment of gastrointestinal inflammatory disorders, showcasing significant therapeutic efficacy, particularly against ulcerative colitis (UC), within the realm of Chinese ethnopharmacology. Dendrobium plays crucial pharmacological roles due to its rich content of polysaccharides, alkaloids, phenanthrenes, and bibenzyls. Gigantol, a prominent bibenzyl compound, stands out as one of the most vital active constituents within Dendrobium, the gigantol content of Dendrobium leaves can reach approximately 4.79 μg/g. Its significance lies in being recognized as a noteworthy anti-inflammatory compound derived from Dendrobium. AIM OF THE STUDY Given the pivotal role of gigantol as a primary active substance in Dendrobium, the therapeutic potential of gigantol for gastrointestinal diseases remains enigmatic. Our present investigation aimed to evaluate the therapeutic effects of gigantol on dextran sulfate sodium (DSS)-induced colitis and reveal its potential mechanism in countering UC activity. MATERIALS AND METHODS The protective efficacy of gigantol against colitis was assessed by examining the histopathological changes and conducting biochemical analyses of colon from DSS-challenged mice. Assessments focused on gigantol's impact on improving the intestinal epithelial barrier and its anti-inflammatory effects in colonic tissues of colitis mice. Investigative techniques included the exploration of the macrophage inflammatory signaling pathway via qPCR and Western blot analyses. In vitro studies scrutinized macrophage adhesion, migration, and chemotaxis utilizing transwell and Zigmond chambers. Furthermore, F-actin and Rac1 activation assays detailed cellular cytoskeletal remodeling. The potential therapeutic target of gigantol was identified and validated through protein binding analysis, competitive enzyme-linked immunosorbent assay (ELISA), cellular thermal shift assay (CETSA), and drug affinity responsive target stability (DARTS) assay. The binding sites between gigantol and its target were predicted via molecular docking. RESULTS Gigantol ameliorated symptoms of DSS-induced colitis, rectified damage to the intestinal barrier, and suppressed the production of pro-inflammatory cytokines in colonic tissues. Intriguingly, gigantol significantly curtailed NF-κB signaling activation in the colons of DSS-induced colitis mice. Notably, gigantol impaired the β2 integrin-dependent adhesion and migratory capacity of RAW264.7 cells. Moreover, gigantol notably influenced the cytoskeleton remodeling of RAW264.7 cells by suppressing Vav1 phosphorylation and Rac1 activation. Mechanistically, gigantol interacted with β2 integrin, subsequently diminishing binding affinity with intercellular adhesion molecule-1 (ICAM-1). CONCLUSIONS In conclusion, these findings elucidate that gigantol ameliorates DSS-induced colitis by antagonizing β2 integrin-mediated macrophage adhesion, migration, and chemotaxis, thus it may impede macrophage recruitment and infiltration into colonic tissues. This study suggests that gigantol shows promise as a viable candidate for clinical colitis therapy.
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Affiliation(s)
- Weilai Yu
- Department of Gastroenterology, The Third Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325200, PR China
| | - Boyang Li
- Zhejiang Provincial Key Laboratory for Water Environment and Marine Biological Resources Protection, College of Life and Environmental Science, Wenzhou University, Wenzhou, 325000, PR China
| | - Luxi Chen
- Pediatric Emergency Observation Department, The Third Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325200, PR China
| | - Qiu Chen
- Department of Endocrinology, The Third Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325200, PR China
| | - QingQing Song
- Department of Gastroenterology, The Third Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325200, PR China
| | - Xiaosheng Jin
- Department of Gastroenterology, The Third Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325200, PR China
| | - Yandan Yin
- Department of Pediatric Medicine, Taizhou Women and Children's Hospital of Wenzhou Medical University, Taizhou, 325200, PR China
| | - Haibin Tong
- Zhejiang Provincial Key Laboratory for Water Environment and Marine Biological Resources Protection, College of Life and Environmental Science, Wenzhou University, Wenzhou, 325000, PR China; State Key Laboratory for Quality Ensurance and Sustainable Use of Dao-di Herbs, Beijing, 100700, PR China.
| | - Liwei Xue
- Department of Gastroenterology, The Third Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325200, PR China.
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3
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Xue L, Jin X, Ji T, Li R, Zhuge X, Xu F, Quan Z, Tong H, Yu W. Luteolin ameliorates DSS-induced colitis in mice via suppressing macrophage activation and chemotaxis. Int Immunopharmacol 2023; 124:110996. [PMID: 37776768 DOI: 10.1016/j.intimp.2023.110996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 09/03/2023] [Accepted: 09/24/2023] [Indexed: 10/02/2023]
Abstract
OBJECTIVES Luteolin, known for its multifaceted therapeutic properties against inflammatory diseases, holds potential for addressing the unmet need for effective treatments in ulcerative colitis (UC), a prevalent subtype of inflammatory bowel disease (IBD). This study aimed to comprehensively assess luteolin's therapeutic efficacy in a dextran sulfate sodium (DSS)-induced colitis mouse model, shedding light on its anti-UC mechanisms. METHODS Our investigation encompassed in vivo assessments of luteolin's therapeutic potential against DSS-induced colitis through rigorous histopathological examination and biochemical analyses. Furthermore, we scrutinized luteolin's anti-inflammatory prowess in vitro using lipopolysaccharide (LPS)-stimulated RAW264.7 cells and primary peritoneal macrophages. Additionally, we quantitatively evaluated the impact of luteolin on C-C motif chemokine ligand 2 (CCL2)-induced macrophage migration employing Transwell and Zigmond chambers. Furthermore, cellular thermal shift assay (CETSA), drug affinity responsive target stability (DARTS) assay, and molecular docking were employed to identify potential therapeutic targets of luteolin and investigate their binding sites and interaction patterns. RESULTS Luteolin demonstrated therapeutic potential against DSS-induced colitis by ameliorating colitis symptoms, restoring intestinal barrier integrity, and inhibiting proinflammatory cytokine production in the colonic tissues. Moreover, luteolin demonstrated robust anti-inflammatory activity in vitro, in lipopolysaccharide (LPS)-stimulated RAW264.7 cells and primary peritoneal macrophages. Notably, luteolin suppressed the phosphorylation of IKKα/β, IκBα, and p65, along with preventing IκBα degradation in LPS-treated RAW264.7 cells and peritoneal macrophages. Furthermore, luteolin impaired the migratory behavior of RAW264.7 cells and peritoneal macrophages, as evidenced by reduced migration distance and velocity of luteolin-treated macrophages. Mechanistically, luteolin was found to antagonize IKKα/β, subsequently inhibiting IKKα/β phosphorylation and the activation of NF-κB signaling. CONCLUSION Luteolin emerges as a promising lead compound for the clinical therapy of colitis by virtue of its ability to ameliorate DSS-induced colitis, antagonize IKKα/β, suppress NF-κB signaling, and impede macrophage activation and migration.
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Affiliation(s)
- Liwei Xue
- Department of Gastroenterology, The Third Affiliated Hospital of Wenzhou Medical University, Wenzhou 325200, Zhejiang Province, PR China
| | - Xiaosheng Jin
- Department of Gastroenterology, The Third Affiliated Hospital of Wenzhou Medical University, Wenzhou 325200, Zhejiang Province, PR China
| | - Tingting Ji
- Department of Gastroenterology, The Third Affiliated Hospital of Wenzhou Medical University, Wenzhou 325200, Zhejiang Province, PR China
| | - Rongzhou Li
- Department of Gastroenterology, The Third Affiliated Hospital of Wenzhou Medical University, Wenzhou 325200, Zhejiang Province, PR China
| | - Xiaoju Zhuge
- Department of Gastroenterology, The Third Affiliated Hospital of Wenzhou Medical University, Wenzhou 325200, Zhejiang Province, PR China
| | - Fang Xu
- Department of Gastroenterology, The Third Affiliated Hospital of Wenzhou Medical University, Wenzhou 325200, Zhejiang Province, PR China
| | - Zijiao Quan
- Zhejiang Provincial Key Laboratory for Water Environment and Marine Biological Resources Protection, College of Life and Environmental Science, Wenzhou University, Wenzhou 325000, Zhejiang Province, PR China
| | - Haibin Tong
- Zhejiang Provincial Key Laboratory for Water Environment and Marine Biological Resources Protection, College of Life and Environmental Science, Wenzhou University, Wenzhou 325000, Zhejiang Province, PR China.
| | - Weilai Yu
- Department of Gastroenterology, The Third Affiliated Hospital of Wenzhou Medical University, Wenzhou 325200, Zhejiang Province, PR China.
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Dai N, Li G, Ni J, Li F, Tong H, Liu Y. A novel galactoxylan derived from Viola diffusa alleviates LPS-induced acute lung injury via antagonizing P-selectin-mediated adhesion function. Int J Biol Macromol 2023; 242:124821. [PMID: 37178888 DOI: 10.1016/j.ijbiomac.2023.124821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 05/02/2023] [Accepted: 05/07/2023] [Indexed: 05/15/2023]
Abstract
Acute lung injury (ALI) greatly threatens human health worldwide. P-selectin is a potential target for the treatment of acute inflammatory diseases, and natural polysaccharides exhibit high-affinity for P-selectin. Viola diffusa, a traditional Chinese herbal, shows strong anti-inflammatory effects, but pharmacodynamic substances and underlying mechanisms are still unclear. In this study, a galactoxylan polysaccharide (VDPS) derived from Viola diffusa was isolated and characterized, evaluated the protective effect on LPS induced ALI and underlying mechanism. VDPS significantly alleviated LPS-induced pathological lung injury, and decreased the numbers of total cells and neutrophils as well as the total protein contents in the bronchoalveolar lavage fluid (BALF). Moreover, VDPS reduced proinflammatory cytokine production both in BALF and lung. Interestingly, VDPS significantly restrained the activation of NF-κB signaling in the lung of LPS-exposed mice, but it cannot inhibit LPS-induced inflammation in human pulmonary microvascular endothelial cells (HPMECs) in vitro. Additionally, VDPS disrupted neutrophil adhesion and rolling on the activated HPMECs. VDPS cannot impact the expression or cytomembrane translocation of endothelial P-selectin, but remarkably interrupt the binding of P-selectin and PSGL-1. Overall, this study demonstrated that VDPS can alleviate LPS-induced ALI via inhibiting P-selectin-dependent adhesion and recruitment of neutrophils on the activated endothelium, providing a potential treatment strategy for ALI.
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Affiliation(s)
- Ningfeng Dai
- Department of Thoracic Surgery, The Affiliated Cangnan Hospital of Wenzhou Medical University, Wenzhou 325800, PR China
| | - Ge Li
- Department of Thoracic Surgery, The Third Affiliated Hospital of Wenzhou Medical University, Wenzhou 325200, PR China
| | - Jiangwei Ni
- Department of Thoracic Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, PR China
| | - Fang Li
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325000, PR China
| | - Haibin Tong
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325000, PR China.
| | - Yu Liu
- Department of Thoracic Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, PR China.
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Ni J, Li G, Dai N, Quan Z, Tong H, Liu Y. Esculin alleviates LPS-induced acute lung injury via inhibiting neutrophil recruitment and migration. Int Immunopharmacol 2023; 119:110177. [PMID: 37068336 PMCID: PMC10105132 DOI: 10.1016/j.intimp.2023.110177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 03/25/2023] [Accepted: 04/09/2023] [Indexed: 04/19/2023]
Abstract
OBJECTIVES Acute lung injury (ALI) poses a serious threat to human health globally, particularly with the Coronavirus 2019 (COVID-19) pandemic. Excessive recruitment and infiltration of neutrophils is the major etiopathogenesis of ALI. Esculin, also known as 6,7-dihydroxycoumarin, is a remarkable compound derived from traditional Chinese medicine Cortex fraxini. Accumulated evidence indicates that esculin has potent anti-inflammatory effects, but its pharmaceutical effect against ALI and potential mechanisms are still unclear. METHODS This study evaluated the protective effect of esculin against ALI by histopathological observation and biochemical analysis of lung tissues and bronchoalveolar lavage fluid (BALF) in lipopolysaccharide (LPS)-challenged ALI mice in vivo. The effects of esculin on N-formyl-met-leu-phe (fMLP)-induced neutrophil migration and chemotaxis were quantitatively assessed using a Transwell assay and an automated cell imaging system equipped with a Zigmond chamber, respectively. The drug affinity responsive target stability (DARTS) assay, in vitro protein binding assay and molecular docking were performed to identify the potential therapeutic target of esculin and the potential binding sites and pattern. RESULTS Esculin significantly attenuated LPS-induced lung pathological injury, reduced the levels of pro-inflammatory cytokines in both BALF and lung, and suppressed the activation of NF-κB signaling. Esculin also significantly reduced the number of total cells and neutrophils as well as myeloperoxidase (MPO) activity in the BALF. Esculin impaired neutrophil migration and chemotaxis as evidenced by the reduced migration distance and velocity. Furthermore, esculin remarkably inhibited Vav1 phosphorylation, suppressed Rac1 activation and the PAK1/LIMK1/cofilin signaling axis. Mechanistically, esculin could interact with β2 integrin and then diminish its ligand affinity with intercellular adhesion molecule-1 (ICAM-1). CONCLUSIONS Esculin inhibits β2 integrin-dependent neutrophil migration and chemotaxis, blocks the cytoskeletal remodeling process required for neutrophil recruitment, thereby contributing to its protective effect against ALI. This study demonstrates the new therapeutic potential of esculin as a novel lead compound.
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Affiliation(s)
- Jiangwei Ni
- Department of Thoracic Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, PR China
| | - Ge Li
- Department of Thoracic Surgery, The Third Affiliated Hospital of Wenzhou Medical University, Wenzhou 325200, PR China
| | - Ningfeng Dai
- Department of Thoracic Surgery, The Affiliated Cangnan Hospital of Wenzhou Medical University, Wenzhou 325800, PR China
| | - Zijiao Quan
- Zhejiang Provincial Key Laboratory for Water Environment and Marine Biological Resources Protection, College of Life and Environmental Science, Wenzhou University, Wenzhou 325000, PR China
| | - Haibin Tong
- Zhejiang Provincial Key Laboratory for Water Environment and Marine Biological Resources Protection, College of Life and Environmental Science, Wenzhou University, Wenzhou 325000, PR China.
| | - Yu Liu
- Department of Thoracic Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, PR China.
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6
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Hawez A, Ding Z, Taha D, Madhi R, Rahman M, Thorlacius H. c-Abl kinase regulates neutrophil extracellular trap formation and lung injury in abdominal sepsis. J Transl Med 2022; 102:263-271. [PMID: 34732849 PMCID: PMC8860741 DOI: 10.1038/s41374-021-00683-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 08/23/2021] [Accepted: 10/07/2021] [Indexed: 11/14/2022] Open
Abstract
Sepsis is associated with exaggerated neutrophil responses although mechanisms remain elusive. The aim of this study was to investigate the role of c-Abelson (c-Abl) kinase in neutrophil extracellular trap (NET) formation and inflammation in septic lung injury. Abdominal sepsis was induced by cecal ligation and puncture (CLP). NETs were detected by electron microscopy in the lung and by confocal microscopy in vitro. Plasma levels of DNA-histone complexes, interleukin-6 (IL-6) and CXC chemokines were quantified. CLP-induced enhanced phosphorylation of c-Abl kinase in circulating neutrophils. Administration of the c-Abl kinase inhibitor GZD824 not only abolished activation of c-Abl kinase in neutrophils but also reduced NET formation in the lung and plasma levels of DNA-histone complexes in CLP mice. Moreover, inhibition of c-Abl kinase decreased CLP-induced lung edema and injury. Administration of GDZ824 reduced CLP-induced increases in the number of alveolar neutrophils. Inhibition of c-Abl kinase also markedly attenuated levels of CXC chemokines in the lung and plasma as well as IL-6 levels in the plasma of septic animals. Taken together, this study demonstrates that c-Abl kinase is a potent regulator of NET formation and we conclude that c-Abl kinase might be a useful target to ameliorate lung damage in abdominal sepsis.
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Affiliation(s)
- Avin Hawez
- Department of Clinical Sciences, Malmö, Section for Surgery, Skåne University Hospital, Lund University, 205 02, Malmö, Sweden
| | - Zhiyi Ding
- Department of Clinical Sciences, Malmö, Section for Surgery, Skåne University Hospital, Lund University, 205 02, Malmö, Sweden
| | - Dler Taha
- Department of Clinical Sciences, Malmö, Section for Surgery, Skåne University Hospital, Lund University, 205 02, Malmö, Sweden
| | - Raed Madhi
- Department of Clinical Sciences, Malmö, Section for Surgery, Skåne University Hospital, Lund University, 205 02, Malmö, Sweden
| | - Milladur Rahman
- Department of Clinical Sciences, Malmö, Section for Surgery, Skåne University Hospital, Lund University, 205 02, Malmö, Sweden
| | - Henrik Thorlacius
- Department of Clinical Sciences, Malmö, Section for Surgery, Skåne University Hospital, Lund University, 205 02, Malmö, Sweden.
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7
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Integrin α6 mediates the drug resistance of acute lymphoblastic B-cell leukemia. Blood 2021; 136:210-223. [PMID: 32219444 DOI: 10.1182/blood.2019001417] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Accepted: 03/12/2020] [Indexed: 02/06/2023] Open
Abstract
Resistance to multimodal chemotherapy continues to limit the prognosis of acute lymphoblastic leukemia (ALL). This occurs in part through a process called adhesion-mediated drug resistance, which depends on ALL cell adhesion to the stroma through adhesion molecules, including integrins. Integrin α6 has been implicated in minimal residual disease in ALL and in the migration of ALL cells to the central nervous system. However, it has not been evaluated in the context of chemotherapeutic resistance. Here, we show that the anti-human α6-blocking Ab P5G10 induces apoptosis in primary ALL cells in vitro and sensitizes primary ALL cells to chemotherapy or tyrosine kinase inhibition in vitro and in vivo. We further analyzed the underlying mechanism of α6-associated apoptosis using a conditional knockout model of α6 in murine BCR-ABL1+ B-cell ALL cells and showed that α6-deficient ALL cells underwent apoptosis. In vivo deletion of α6 in combination with tyrosine kinase inhibitor (TKI) treatment was more effective in eradicating ALL than treatment with a TKI (nilotinib) alone. Proteomic analysis revealed that α6 deletion in murine ALL was associated with changes in Src signaling, including the upregulation of phosphorylated Lyn (pTyr507) and Fyn (pTyr530). Thus, our data support α6 as a novel therapeutic target for ALL.
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8
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Jacobs CF, Eldering E, Kater AP. Kinase inhibitors developed for treatment of hematologic malignancies: implications for immune modulation in COVID-19. Blood Adv 2021; 5:913-925. [PMID: 33560402 PMCID: PMC7871903 DOI: 10.1182/bloodadvances.2020003768] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Accepted: 12/28/2020] [Indexed: 02/07/2023] Open
Abstract
Tyrosine kinase inhibitors (TKIs) are used to target dysregulated signaling pathways in virtually all hematologic malignancies. Many of the targeted signaling pathways are also essential in nonmalignant immune cells. The current coronavirus severe acute respiratory syndrome coronavirus 2 pandemic catalyzed clinical exploration of TKIs in the treatment of the various stages of COVID-19, which are characterized by distinct immune-related complications. Most of the reported effects of TKIs on immune regulation have been explored in vitro, with different class-specific drugs having nonoverlapping target affinities. Moreover, many of the reported in vivo effects are based on artificial animal models or on observations made in symptomatic patients with a hematologic malignancy who often already suffer from disturbed immune regulation. Based on in vitro and clinical observations, we attempt to decipher the impact of the main TKIs approved or in late-stage development for the treatment of hematological malignancies, including inhibitors of Bruton's tyrosine kinase, spleen tyrosine kinase, BCR-Abl, phosphatidylinositol 3-kinase/ mammalian target of rapamycin, JAK/STAT, and FMS-like tyrosine kinase 3, to provide a rationale for how such inhibitors could modify clinical courses of diseases, such as COVID-19.
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Affiliation(s)
- Chaja F Jacobs
- Department of Experimental Immunology and
- Department of Hematology, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, The Netherlands
- Cancer Center Amsterdam, Amsterdam, The Netherlands
- Amsterdam Institute for Infection & Immunity, Amsterdam, The Netherlands; and
| | - Eric Eldering
- Department of Experimental Immunology and
- Cancer Center Amsterdam, Amsterdam, The Netherlands
- Amsterdam Institute for Infection & Immunity, Amsterdam, The Netherlands; and
- Lymphoma and Myeloma Center Amsterdam, Amsterdam, The Netherlands
| | - Arnon P Kater
- Department of Hematology, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, The Netherlands
- Cancer Center Amsterdam, Amsterdam, The Netherlands
- Amsterdam Institute for Infection & Immunity, Amsterdam, The Netherlands; and
- Lymphoma and Myeloma Center Amsterdam, Amsterdam, The Netherlands
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9
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Chichirau BE, Diechler S, Posselt G, Wessler S. Tyrosine Kinases in Helicobacter pylori Infections and Gastric Cancer. Toxins (Basel) 2019; 11:toxins11100591. [PMID: 31614680 PMCID: PMC6832112 DOI: 10.3390/toxins11100591] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 10/02/2019] [Accepted: 10/09/2019] [Indexed: 12/11/2022] Open
Abstract
Helicobacter pylori (H. pylori) has been identified as a leading cause of gastric cancer, which is one of the most frequent and malignant types of tumor. It is characterized by its rapid progression, distant metastases, and resistance to conventional chemotherapy. A number of receptor tyrosine kinases and non-receptor tyrosine kinases have been implicated in H. pylori-mediated pathogenesis and tumorigenesis. In this review, recent findings of deregulated EGFR, c-Met, JAK, FAK, Src, and c-Abl and their functions in H. pylori pathogenesis are summarized.
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Affiliation(s)
- Bianca E Chichirau
- Department of Biosciences, Paris-Lodron University of Salzburg, 5020 Salzburg, Austria.
| | - Sebastian Diechler
- Department of Biosciences, Paris-Lodron University of Salzburg, 5020 Salzburg, Austria.
| | - Gernot Posselt
- Department of Biosciences, Paris-Lodron University of Salzburg, 5020 Salzburg, Austria.
| | - Silja Wessler
- Cancer Cluster Salzburg, Department of Biosciences, Paris-Lodron University of Salzburg, 5020 Salzburg, Austria.
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10
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Bohio AA, Sattout A, Wang R, Wang K, Sah RK, Guo X, Zeng X, Ke Y, Boldogh I, Ba X. c-Abl-Mediated Tyrosine Phosphorylation of PARP1 Is Crucial for Expression of Proinflammatory Genes. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2019; 203:1521-1531. [PMID: 31399520 PMCID: PMC6731455 DOI: 10.4049/jimmunol.1801616] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Accepted: 05/07/2019] [Indexed: 12/18/2022]
Abstract
Poly(ADP-ribosyl)ation is a rapid and transient posttranslational protein modification mostly catalyzed by poly(ADP-ribose) polymerase-1 (PARP1). Fundamental roles of activated PARP1 in DNA damage repair and cellular response pathways are well established; however, the precise mechanisms by which PARP1 is activated independent of DNA damage, and thereby playing a role in expression of inflammatory genes, remain poorly understood. In this study, we show that, in response to LPS or TNF-α exposure, the nonreceptor tyrosine kinase c-Abl undergoes nuclear translocation and interacts with and phosphorylates PARP1 at the conserved Y829 site. Tyrosine-phosphorylated PARP1 is required for protein poly(ADP-ribosyl)ation of RelA/p65 and NF-κB-dependent expression of proinflammatory genes in murine RAW 264.7 macrophages, human monocytic THP1 cells, or mouse lungs. Furthermore, LPS-induced airway lung inflammation was reduced by inhibition of c-Abl activity. The present study elucidated a novel signaling pathway to activate PARP1 and regulate gene expression, suggesting that blocking the interaction of c-Abl with PARP1 or pharmaceutical inhibition of c-Abl may improve the outcomes of PARP1 activation-mediated inflammatory diseases.
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Affiliation(s)
- Ameer Ali Bohio
- Key Laboratory of Molecular Epigenetics of the Ministry of Education, Northeast Normal University, Changchun 130024, China
- School of Life Sciences, Northeast Normal University, Changchun 130024, China
| | - Aman Sattout
- Key Laboratory of Molecular Epigenetics of the Ministry of Education, Northeast Normal University, Changchun 130024, China
- School of Life Sciences, Northeast Normal University, Changchun 130024, China
| | - Ruoxi Wang
- Key Laboratory of Molecular Epigenetics of the Ministry of Education, Northeast Normal University, Changchun 130024, China
- School of Life Sciences, Northeast Normal University, Changchun 130024, China
| | - Ke Wang
- Key Laboratory of Molecular Epigenetics of the Ministry of Education, Northeast Normal University, Changchun 130024, China
- School of Life Sciences, Northeast Normal University, Changchun 130024, China
| | - Rajiv Kumar Sah
- Transgenic Research Center, School of Life Sciences, Northeast Normal University, Changchun 130024, China; and
| | - Xiaolan Guo
- Key Laboratory of Molecular Epigenetics of the Ministry of Education, Northeast Normal University, Changchun 130024, China
- School of Life Sciences, Northeast Normal University, Changchun 130024, China
| | - Xianlu Zeng
- Key Laboratory of Molecular Epigenetics of the Ministry of Education, Northeast Normal University, Changchun 130024, China
- School of Life Sciences, Northeast Normal University, Changchun 130024, China
| | - Yueshuang Ke
- Key Laboratory of Molecular Epigenetics of the Ministry of Education, Northeast Normal University, Changchun 130024, China
- School of Life Sciences, Northeast Normal University, Changchun 130024, China
| | - Istvan Boldogh
- Department of Microbiology and Immunology, University of Texas Medical Branch at Galveston, Galveston, TX 77555
| | - Xueqing Ba
- Key Laboratory of Molecular Epigenetics of the Ministry of Education, Northeast Normal University, Changchun 130024, China;
- School of Life Sciences, Northeast Normal University, Changchun 130024, China
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11
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Liu W, Wang X, Wang S, Ba X, Xu T, Wang X, Zeng X. RhoGDI2 positively regulates the Rho GTPases activation in response to the β2 outside-in signaling in T cells adhesion and migration on ICAM-1. J Leukoc Biol 2019; 106:431-446. [PMID: 31075185 DOI: 10.1002/jlb.2a0718-272rr] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2018] [Revised: 04/25/2019] [Accepted: 04/30/2019] [Indexed: 01/08/2023] Open
Abstract
Cytoskeletal reorganization driven by Rho GTPases plays a crucial role in the migration of T cells, which are key regulators of immunity. The molecular mechanisms that control actin cytoskeleton remodeling during T cell movement have only partially been clarified as the function of many modulators has not been evaluated in these cells. Here, we report a new function of RhoGDI2 by showing that this protein positively regulates Rho GTPase activation during T cell adhesion and migration. RhoGDI2 knockdown significantly reduced T cell adhesion and migration. Furthermore, RhoGDI2 knockdown decreased the activation of Rac1 and Cdc42, 2 members of Rho GTPases, and the remodeling of the actin cytoskeleton. Upon P-selectin glycoprotein ligand-1 engagement, RhoGDI2 was phosphorylated at Y24 and Y153 by kinases related to β2 integrin outside-in signaling, Src, c-Abl, and Syk, resulting in the accumulation of RhoGDI2 at the cell membrane. Subsequent phosphorylation of S31 induced the opening of RhoGDI2 and the release of Rho GTPases, whereas phosphorylation of Y153 might promote the activation of Rho GTPases by recruiting Vav1. Moreover, the disruption of lipid rafts with methyl-β-cyclodextrin blocked the interaction between integrins and RhoGDI2, reducing the level of phosphorylated RhoGDI2 and the activation of downstream Rho GTPases. Based on these observations, RhoGDI2 is a target of intergrin outside-in signaling that activates Rho GTPases during T cell adhesion and migration, and RhoGDI2-mediated signal transduction is based on the lipid rafts integrity.
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Affiliation(s)
- Wenai Liu
- The Key Laboratory of Molecular Epigenetics of MOE, Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, Changchun, Jilin, China
| | - Xuehao Wang
- The Key Laboratory of Molecular Epigenetics of MOE, Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, Changchun, Jilin, China
| | - Shan Wang
- The Key Laboratory of Molecular Epigenetics of MOE, Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, Changchun, Jilin, China
| | - Xueqing Ba
- The Key Laboratory of Molecular Epigenetics of MOE, Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, Changchun, Jilin, China
| | - Tingshuang Xu
- Department of Rheumatology and Immunology, China-Japan Union Hospital of Jilin University, Changchun, Jilin, China
| | - Xiaoguang Wang
- Department of Bioscience, Changchun Normal University, Changchun, Jilin, China
| | - Xianlu Zeng
- The Key Laboratory of Molecular Epigenetics of MOE, Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, Changchun, Jilin, China
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12
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Madhi R, Rahman M, Mörgelin M, Thorlacius H. c-Abl kinase regulates neutrophil extracellular trap formation, inflammation, and tissue damage in severe acute pancreatitis. J Leukoc Biol 2019; 106:455-466. [PMID: 30861207 DOI: 10.1002/jlb.3a0618-222rr] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Revised: 02/26/2019] [Accepted: 02/28/2019] [Indexed: 01/08/2023] Open
Abstract
Neutrophil extracellular traps (NETs) are involved in acute pancreatitis (AP) but mechanisms controlling NET expulsion in AP are incompletely understood. Herein, we examined the role of c-Abelson (c-Abl) kinase in NET formation and tissue damage in severe AP. AP was induced by taurocholate infusion into pancreatic duct or intraperitoneal administration of l-arginine in mice. Pancreatic, lung, and blood samples were collected and levels of phosphorylated c-Abl kinase, citrullinated histone 3, DNA-histone complexes, myeloperoxidase, amylase, cytokines, and CXC chemokines were quantified. Citrullinated histone 3, reactive oxygen species (ROS), and NET formation were determined in bone marrow neutrophils. Taurocholate challenge increased phosphorylation of c-Abl kinase and levels of citrullinated histone 3 in the pancreas as well as DNA-histone complexes in the plasma. Administration of the c-Abl kinase inhibitor GZD824 not only abolished activation of c-Abl kinase but also decreased levels of citrullinated histone 3 in the pancreas and DNA-histone complexes in the plasma of animals with AP. Moreover, GZD824 decreased plasma levels of amylase, IL-6, and MMP-9 as well as edema, acinar cell necrosis, hemorrhage, CXC chemokine formation, and neutrophil infiltration in the inflamed pancreas. A beneficial effect of c-Abl kinase inhibition was confirmed in l-arginine-induced pancreatitis. In vitro, inhibition of c-Abl kinase reduced TNF-α-induced formation of ROS, histone 3 citrullination, and NETs in isolated bone marrow neutrophils. Our findings demonstrate that c-Abl kinase regulates NET formation in the inflamed pancreas. In addition, inhibition of c-Abl kinase reduced pancreatic tissue inflammation, and damage in AP. Thus, targeting c-Abl kinase might be a useful way to protect the pancreas in severe AP.
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Affiliation(s)
- Raed Madhi
- Department of Clinical Science, Malmö, Section for Surgery, Skåne University Hospital, Lund University, Malmö, Sweden
| | - Milladur Rahman
- Department of Clinical Science, Malmö, Section for Surgery, Skåne University Hospital, Lund University, Malmö, Sweden
| | | | - Henrik Thorlacius
- Department of Clinical Science, Malmö, Section for Surgery, Skåne University Hospital, Lund University, Malmö, Sweden
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13
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Tripathi R, Liu Z, Plattner R. EnABLing Tumor Growth and Progression: Recent progress in unraveling the functions of ABL kinases in solid tumor cells. CURRENT PHARMACOLOGY REPORTS 2018; 4:367-379. [PMID: 30746323 PMCID: PMC6368175 DOI: 10.1007/s40495-018-0149-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
PURPOSE OF REVIEW The goal of this review is to summarize our current knowledge regarding how ABL family kinases are activated in solid tumors and impact on solid tumor development/progression, with a focus on recent advances in the field. RECENT FINDINGS Although ABL kinases are known drivers of human leukemia, emerging data also implicates the kinases in a large number of solid tumor types where they promote diverse processes such as proliferation, survival, cytoskeletal reorganization, cellular polarity, EMT (epithelial-mesenchymal-transition), metabolic reprogramming, migration, invasion and metastasis via unique signaling pathways. ABL1 and ABL2 appear to have overlapping but also unique roles in driving these processes. In some tumor types, the kinases may act to integrate pro- and anti-proliferative and -invasive signals, and also may serve as a switch during EMT/MET (mesenchymal-epithelial) transitions. CONCLUSIONS Most data indicate that targeting ABL kinases may be effective for reducing tumor growth and preventing metastasis; however, ABL kinases also may have a tumor suppressive role in some tumor types and in some cellular contexts. Understanding the functions of ABL kinases in solid tumors is critical for developing successful clinical trials aimed at targeting ABL kinases for the treatment of solid tumors.
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Affiliation(s)
- Rakshamani Tripathi
- Department of Pharmacology and Nutritional Sciences, University of Kentucky School of Medicine, Lexington, Kentucky 40536
| | - Zulong Liu
- Department of Pharmacology and Nutritional Sciences, University of Kentucky School of Medicine, Lexington, Kentucky 40536
| | - Rina Plattner
- Department of Pharmacology and Nutritional Sciences, University of Kentucky School of Medicine, Lexington, Kentucky 40536
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14
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Tong H, Qi D, Guan X, Jiang G, Liao Z, Zhang X, Chen P, Li N, Wu M. c-Abl tyrosine kinase regulates neutrophil crawling behavior under fluid shear stress via Rac/PAK/LIMK/cofilin signaling axis. J Cell Biochem 2017; 119:2806-2817. [PMID: 29058761 DOI: 10.1002/jcb.26453] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Accepted: 10/17/2017] [Indexed: 12/13/2022]
Abstract
The excessive recruitment and improper activation of polymorphonuclear neutrophils (PMNs) often induces serious injury of host tissues, leading to inflammatory disorders. Therefore, to understand the molecular mechanism on neutrophil recruitment possesses essential pathological and physiological importance. In this study, we found that physiological shear stress induces c-Abl kinase activation in neutrophils, and c-Abl kinase inhibitor impaired neutrophil crawling behavior on ICAM-1. We further identified Vav1 was a downstream effector phosphorylated at Y174 and Y267. Once activated, c-Abl kinase regulated the activity of Vav1, which further affected Rac1/PAK1/LIMK1/cofilin signaling pathway. Here, we demonstrate a novel signaling function and critical role of c-Abl kinase during neutrophil crawling under physiological shear by regulating Vav1. These findings provide a promising treatment strategy for inflammation-related disease by inactivation of c-Abl kinase to restrict neutrophil recruitment.
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Affiliation(s)
- Haibin Tong
- College of Life and Environmental Science, Wenzhou University, Wenzhou, China.,Jilin Provincial Key Laboratory of Molecular Geriatric Medicine, Life Science Research Center, Beihua University, Jilin, China
| | - Dake Qi
- Faculty of Medicine, Division of Biomedical Sciences, Memorial University of Newfoundland, St. John's, Newfoundland, Canada
| | - Xingang Guan
- Jilin Provincial Key Laboratory of Molecular Geriatric Medicine, Life Science Research Center, Beihua University, Jilin, China
| | - Guiquan Jiang
- Jilin Provincial Key Laboratory of Molecular Geriatric Medicine, Life Science Research Center, Beihua University, Jilin, China
| | - Zhiyong Liao
- College of Life and Environmental Science, Wenzhou University, Wenzhou, China
| | - Xu Zhang
- College of Life and Environmental Science, Wenzhou University, Wenzhou, China
| | - Peichao Chen
- College of Life and Environmental Science, Wenzhou University, Wenzhou, China
| | - Nan Li
- College of Life and Environmental Science, Wenzhou University, Wenzhou, China
| | - Mingjiang Wu
- College of Life and Environmental Science, Wenzhou University, Wenzhou, China
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15
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Zhang Y, Wu W, Kang L, Yu D, Liu C. Effect of Aconitum coreanum polysaccharide and its sulphated derivative on the migration of human breast cancer MDA-MB-435s cell. Int J Biol Macromol 2017; 103:477-483. [DOI: 10.1016/j.ijbiomac.2017.05.084] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2017] [Revised: 05/04/2017] [Accepted: 05/16/2017] [Indexed: 12/13/2022]
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16
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Wu BC, Patel ED, Ortega-Loayza AG. Drug-induced pyoderma gangrenosum: a model to understand the pathogenesis of pyoderma gangrenosum. Br J Dermatol 2017; 177:72-83. [PMID: 27864925 DOI: 10.1111/bjd.15193] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/30/2016] [Indexed: 12/14/2022]
Abstract
Pyoderma gangrenosum (PG) is a rare autoinflammatory condition in which the alteration of neutrophil function and the innate immune response play key roles in its pathogenesis. Cases of PG have been reported in patients being treated with certain medications, which may help us to understand some of the possible pathways involved in the aetiology of PG. The aim of this review is to review the cases of PG triggered by certain drugs and try to thoroughly understand the pathogenesis of the disease. To accomplish this, a PubMed search was completed using the following words: pyoderma gangrenosum, neutrophilic dermatosis, pathophysiology, drug-induced pyoderma gangrenosum. In total, we found 43 cases of drug-induced PG. Most of them were caused by colony-stimulating factors and small-molecule tyrosine kinase inhibitors. We propose that drugs induce PG through various mechanisms such as dysfunctional neutrophil migration and function, dysregulated inflammatory response, promotion of keratinocyte apoptosis and alteration of epigenetic mechanisms. PG is a rare condition with complex pathophysiology and drug-induced cases are even more scarce; this is the main limitation of this review. Understanding the possible mechanisms of drug-induced PG, via abnormal neutrophil migration and function, abnormal inflammation, keratinocyte apoptosis and alteration of epigenetic mechanisms would help to better understand the pathogenesis of PG and ultimately to optimize targeted therapy.
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Affiliation(s)
- B C Wu
- Department of Medicine, Drexel University College of Medicine/Hahnemann University Hospital, Philadelphia, PA, U.S.A
| | - E D Patel
- Virginia Commonwealth University School of Medicine, Richmond, VA, U.S.A
| | - A G Ortega-Loayza
- Center for Wound and Healing, Department of Dermatology, Oregon Health & Science University, 3303 SW Bond Avenue, CHD 16D, Portland, OR, 97034, U.S.A
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17
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Yipp BG, Kim JH, Lima R, Zbytnuik LD, Petri B, Swanlund N, Ho M, Szeto VG, Tak T, Koenderman L, Pickkers P, Tool ATJ, Kuijpers TW, van den Berg TK, Looney MR, Krummel MF, Kubes P. The Lung is a Host Defense Niche for Immediate Neutrophil-Mediated Vascular Protection. Sci Immunol 2017. [PMID: 28626833 DOI: 10.1126/sciimmunol.aam8929] [Citation(s) in RCA: 135] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Bloodstream infection is a hallmark of sepsis, a medically emergent condition requiring rapid treatment. However, upregulation of host defense proteins through toll-like receptors and NFκB requires hours after endotoxin detection. Using confocal pulmonary intravital microscopy, we identified that the lung provides a TLR4-Myd88-and abl tyrosine kinase-dependent niche for immediate CD11b-dependent neutrophil responses to endotoxin and Gram-negative bloodstream pathogens. In an in vivo model of bacteremia, neutrophils crawled to and rapidly phagocytosed Escherichia coli sequestered to the lung endothelium. Therefore, the lung capillaries provide a vascular defensive niche whereby endothelium and neutrophils cooperate for immediate detection and capture of disseminating pathogens.
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Affiliation(s)
- Bryan G Yipp
- Department of Critical Care, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.,Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Jung Hwan Kim
- Department of Critical Care, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.,Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Ronald Lima
- Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.,Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Lori D Zbytnuik
- Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.,Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Björn Petri
- Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.,Mouse Phenomics Resource Laboratory, Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Department of Microbiology, Immunology and Infectious Diseases, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Nick Swanlund
- Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.,Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - May Ho
- Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.,Department of Microbiology, Immunology and Infectious Diseases, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Vivian G Szeto
- Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.,Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Tamar Tak
- Department of Respiratory Medicine, University Medical Centre Utrecht, Utrecht, the Netherlands Emma Children's Hospital, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | - Leo Koenderman
- Department of Respiratory Medicine, University Medical Centre Utrecht, Utrecht, the Netherlands Emma Children's Hospital, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | - Peter Pickkers
- Department of Intensive Care, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | - Anton T J Tool
- Department of Blood Cell Research, Sanquin Research, and Landsteiner Laboratory, Amsterdam, The Netherlands
| | - Taco W Kuijpers
- Department of Blood Cell Research, Sanquin Research, and Landsteiner Laboratory, Amsterdam, The Netherlands
| | - Timo K van den Berg
- Department of Blood Cell Research, Sanquin Research, and Landsteiner Laboratory, Amsterdam, The Netherlands.,Department of Molecular Cell Biology and Immunology, VU Medical Center, Amsterdam, The Netherlands
| | - Mark R Looney
- Departments of Medicine and Laboratory Medicine, University of California, San Francisco, 513 Parnassus Avenue, HSW512, California 94143-0511, USA
| | - Matthew F Krummel
- Department of Pathology, University of California, San Francisco, 513 Parnassus Ave, HSW512, San Francisco, California 94143-0511, USA
| | - Paul Kubes
- Department of Critical Care, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.,Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.,Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.,Mouse Phenomics Resource Laboratory, Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Department of Microbiology, Immunology and Infectious Diseases, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
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18
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Abe T, Hirasaka K, Nikawa T. Involvement of Cbl-b-mediated macrophage inactivation in insulin resistance. World J Diabetes 2017; 8:97-103. [PMID: 28344752 PMCID: PMC5348625 DOI: 10.4239/wjd.v8.i3.97] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2016] [Revised: 08/31/2016] [Accepted: 01/14/2017] [Indexed: 02/05/2023] Open
Abstract
Aging and overnutrition cause obesity in rodents and humans. It is well-known that obesity causes various diseases by producing insulin resistance (IR). Macrophages infiltrate the adipose tissue (AT) of obese individuals and cause chronic low-level inflammation associated with IR. Macrophage infiltration is regulated by the chemokines that are released from hypertrophied adipocytes and the immune cells in AT. Saturated fatty acids are recognized by toll-like receptor 4 (TLR4) and induce inflammatory responses in AT macrophages (ATMs). The inflammatory cytokines that are released from activated ATMs promote IR in peripheral organs, such as the liver, skeletal muscle and AT. Therefore, ATM activation is a therapeutic target for IR in obesity. The ubiquitin ligase Casitas b-lineage lymphoma-b (Cbl-b) appears to potently suppress macrophage migration and activation. Cbl-b is highly expressed in leukocytes and negatively regulates signals associated with migration and activation. Cbl-b deficiency enhances ATM accumulation and IR in aging- and diet-induced obese mice. Cbl-b inhibits migration-related signals and SFA-induced TLR4 signaling in ATMs. Thus, targeting Cbl-b may be a potential therapeutic strategy to reduce the IR induced by ATM activation. In this review, we summarize the regulatory functions of Cbl-b in ATMs.
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19
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Letsiou E, Sammani S, Wang H, Belvitch P, Dudek SM. Parkin regulates lipopolysaccharide-induced proinflammatory responses in acute lung injury. Transl Res 2017; 181:71-82. [PMID: 27693468 DOI: 10.1016/j.trsl.2016.09.002] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Revised: 08/18/2016] [Accepted: 09/03/2016] [Indexed: 12/12/2022]
Abstract
The acute respiratory distress syndrome (ARDS) is a serious condition resulting from direct or indirect lung injury that is associated with high mortality and morbidity. A key biological event in the pathogenesis of the acute lung injury (ALI) that causes acute respiratory distress syndrome is activation of the lung endothelium cells (ECs), which is triggered by a variety of inflammatory insults leading to barrier disruption and excessive accumulation of neutrophils. Recently, we demonstrated that imatinib protects against lipopolysaccharide (LPS)-induced EC activation by inhibiting c-Abl kinase. In the present study, we explored the role of parkin, a novel c-Abl substrate, in ALI. Parkin is an E3 ubiquitin ligase originally characterized in the pathogenesis of Parkinson disease; however, its potential role in acute inflammatory processes and lung EC function remains largely unknown. Using parkin deficient (PARK2-/-) mice, we now demonstrate that parkin mediates LPS-induced ALI. After LPS, PARK2-/- mice have reduced total protein and cell levels in bronchoalveolar lavage (BAL) compared to wild type. Moreover, in LPS-treated PARK2-/- lungs, the sequestration and activation of neutrophils and release of inflammatory cytokines (interleukin 6 [IL-6], tumor necrosis factor alpha [TNF-α]) are significantly reduced. The BAL levels of soluble VCAM-1 and ICAM-1 are also decreased in LPS-treated PARK2-/- mice compared to wild type. In cultured human lung endothelial cells, downregulation of parkin by small interfering RNA decreases LPS-induced VCAM-1 expression, IL-8 and IL-6 secretion, and NF-kB phosphorylation. These results suggest a previously unidentified role of parkin in mediating endotoxin-induced endothelial proinflammatory signaling and indicate that it may play a critical role in acute inflammation.
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Affiliation(s)
- Eleftheria Letsiou
- Division of Pulmonary, Critical Care, Sleep, and Allergy, University of Illinois, Chicago, Ill.
| | - Saad Sammani
- Arizona Health Sciences Center, University of Arizona, Ariz
| | - Huashan Wang
- Division of Pulmonary, Critical Care, Sleep, and Allergy, University of Illinois, Chicago, Ill
| | - Patrick Belvitch
- Division of Pulmonary, Critical Care, Sleep, and Allergy, University of Illinois, Chicago, Ill
| | - Steven M Dudek
- Division of Pulmonary, Critical Care, Sleep, and Allergy, University of Illinois, Chicago, Ill
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20
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Tian X, Qi W, Chen H, Zeng X, Han L, Mi D. β-Actin regulates interleukin 6-induced p21 transcription by interacting with the Rpb5 and Rpb7 subunits of RNA polymerase II. Anim Cells Syst (Seoul) 2016. [DOI: 10.1080/19768354.2016.1224204] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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21
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Photo-enhancement of macrophage phagocytic activity via Rac1-mediated signaling pathway: Implications for bacterial infection. Int J Biochem Cell Biol 2016; 78:206-216. [PMID: 27345261 DOI: 10.1016/j.biocel.2016.06.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Revised: 05/12/2016] [Accepted: 06/19/2016] [Indexed: 11/20/2022]
Abstract
Phagocytosis and the subsequent destruction of invading pathogens by macrophages are indispensable steps in host immune responses to microbial infections. Low-power laser irradiation (LPLI) has been found to exert photobiological effects on immune responses, but the signaling mechanisms underlying this photobiomodulation of phagocytosis remains largely unknown. Here, we demonstrated for the first time that LPLI enhanced the phagocytic activity of macrophages by stimulating the activation of Rac1. The overexpression of constitutively activated Rac1 clearly enhanced LPLI-induced phagocytosis, whereas the overexpression of dominant negative Rac1 exerted the opposite effect. The phosphorylation of cofilin was involved in the effects of LPLI on phagocytosis, which was regulated by the membrane translocation and activation of Rac1. Furthermore, the photoactivation of Rac1 was dependent on the Src/PI3K/Vav1 pathway. The inhibition of the Src/PI3K pathway significantly suppressed LPLI-induced actin polymerization and phagocytosis enhancement. Additionally, LPLI-treated mice exhibited increased survival and a decreased organ bacterial load when challenged with Listeria monocytogenes, indicating that LPLI enhanced macrophage phagocytosis in vivo. These findings highlight the important roles of the Src/PI3K/Vav1/Rac1/cofilin pathway in regulating macrophage phagocytosis and provide a potential strategy for treating phagocytic deficiency via LPLI.
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22
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Tong H, Jiang G, Guan X, Wu H, Song K, Cheng K, Sun X. Characterization of a polysaccharide from Rosa davurica and inhibitory activity against neutrophil migration. Int J Biol Macromol 2016; 89:111-7. [PMID: 27112979 DOI: 10.1016/j.ijbiomac.2016.04.062] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2016] [Revised: 04/15/2016] [Accepted: 04/21/2016] [Indexed: 12/21/2022]
Abstract
The rapid recruitment of neutrophils from peripheral blood into infected sites is critical step for inflammatory responses; however, the excessive and improper recruitment can lead to serious tissue damages. Thus, it is a promising strategy to inhibit their excessive recruitment for treating inflammation-related disease. Here, we isolated a polysaccharide (RDPA1) from Rosa davurica, to evaluate its physicochemical property and inhibitory effects on neutrophil migration. RDPA1 was obtained by hot-water extraction, ethanol precipitation, and fractionated by DEAE-cellulose and Sepharose CL-6B columns. RDPA1 significantly inhibited in vitro migration of human neutrophils evaluated by transwell chamber and impacted the migratory behavior observed by time-lapsed microscopy, we found the migrated distance and average velocity of RDPA1-treated cells were greatly reduced. In addition, RDPA1 treatment impaired in vivo neutrophil infiltration in the peritonitis mice. RDPA1 exhibited significant blocking capacity of the interaction between β2 integrins and ICAM-1 evaluated by flow cytometry and in vitro protein binding assay. Together, these results suggest RDPA1 could be considered as a potential candidate for developing a novel anti-inflammatory agent.
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Affiliation(s)
- Haibin Tong
- Jilin Provincial Key Laboratory of Molecular Geriatric Medicine, Life Science Research Center, Beihua University, Jilin 132013, China; Wood Material Science and Engineering Key Laboratory of Jilin Province, Beihua University, Jilin 132013, China
| | - Guiquan Jiang
- Wood Material Science and Engineering Key Laboratory of Jilin Province, Beihua University, Jilin 132013, China
| | - Xingang Guan
- Jilin Provincial Key Laboratory of Molecular Geriatric Medicine, Life Science Research Center, Beihua University, Jilin 132013, China
| | - Hong Wu
- Laboratory of Cell Imaging, Henan University of Traditional Chinese Medicine, Zhengzhou 450002, China
| | - Kangxing Song
- Department of Cardiology, The General Hospital of Chinese People's Liberation Army, Beijing 100853, China
| | - Kuan Cheng
- Affiliated Hospital, Northeast Normal University, Changchun 130024, China
| | - Xin Sun
- Jilin Provincial Key Laboratory of Molecular Geriatric Medicine, Life Science Research Center, Beihua University, Jilin 132013, China.
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Qi W, Wang R, Chen H, Wang X, Xiao T, Boldogh I, Ba X, Han L, Zeng X. BRG1 promotes the repair of DNA double-strand breaks by facilitating the replacement of RPA with RAD51. J Cell Sci 2014; 128:317-30. [PMID: 25395584 DOI: 10.1242/jcs.159103] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
DNA double-strand breaks (DSBs) are a type of lethal DNA damage. The repair of DSBs requires tight coordination between the factors modulating chromatin structure and the DNA repair machinery. BRG1, the ATPase subunit of the chromatin remodelling complex Switch/Sucrose non-fermentable (SWI/SNF), is often linked to tumorigenesis and genome instability, and its role in DSB repair remains largely unclear. In the present study, we show that BRG1 is recruited to DSB sites and enhances DSB repair. Using DR-GFP and EJ5-GFP reporter systems, we demonstrate that BRG1 facilitates homologous recombination repair rather than nonhomologous end-joining (NHEJ) repair. Moreover, the BRG1-RAD52 complex mediates the replacement of RPA with RAD51 on single-stranded DNA (ssDNA) to initiate DNA strand invasion. Loss of BRG1 results in a failure of RAD51 loading onto ssDNA, abnormal homologous recombination repair and enhanced DSB-induced lethality. Our present study provides a mechanistic insight into how BRG1, which is known to be involved in chromatin remodelling, plays a substantial role in the homologous recombination repair pathway in mammalian cells.
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Affiliation(s)
- Wenjing Qi
- The Key Laboratory of Molecular Epigenetics of MOE, Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, #5268, Renmin Street, Changchun, Jilin, 130024, China
| | - Ruoxi Wang
- The Key Laboratory of Molecular Epigenetics of MOE, Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, #5268, Renmin Street, Changchun, Jilin, 130024, China
| | - Hongyu Chen
- The Key Laboratory of Molecular Epigenetics of MOE, Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, #5268, Renmin Street, Changchun, Jilin, 130024, China
| | - Xiaolin Wang
- The Key Laboratory of Molecular Epigenetics of MOE, Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, #5268, Renmin Street, Changchun, Jilin, 130024, China
| | - Ting Xiao
- The Key Laboratory of Molecular Epigenetics of MOE, Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, #5268, Renmin Street, Changchun, Jilin, 130024, China
| | - Istvan Boldogh
- Department of Microbiology and Immunology, Sealy Center for Molecular Medicine, University of Texas Medical Branch at Galveston, Galveston, TX 77555, USA
| | - Xueqing Ba
- The Key Laboratory of Molecular Epigenetics of MOE, Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, #5268, Renmin Street, Changchun, Jilin, 130024, China
| | - Liping Han
- Department of Bioscience, Changchun Normal University, #677, Changji Northroad, Changchun, Jilin, 130032, China
| | - Xianlu Zeng
- The Key Laboratory of Molecular Epigenetics of MOE, Institute of Genetics and Cytology, School of Life Sciences, Northeast Normal University, #5268, Renmin Street, Changchun, Jilin, 130024, China
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He Z, Chen H, Li G, Zhu H, Gao Y, Zhang L, Sun J. Diosgenin inhibits the migration of human breast cancer MDA-MB-231 cells by suppressing Vav2 activity. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2014; 21:871-6. [PMID: 24656238 DOI: 10.1016/j.phymed.2014.02.002] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2013] [Revised: 10/11/2013] [Accepted: 02/16/2014] [Indexed: 05/07/2023]
Abstract
Diosgenin, a naturally occurring steroidal saponin, possess tumor therapeutic potential. However, the effect of diosgenin on cancer metastasis remains poorly understood. In this study, we performed in vitro experiments to investigate the inhibitory activity of diosgenin on human breast cancer MDA-MB-231 cell migration, and reveal the possible mechanism. Diosgenin caused a marked inhibition of cell migration in MDA-MB-231 cell by transwell assay. In addition, diosgenin significantly impacted MDA-MB-231 cell migratory behavior under real-time observation. We also found diosgenin significantly inhibited actin polymerization, Vav2 phosphorylation and Cdc42 activation, which might be, at least in part, attributed to the anti-metastatic potential of diosgenin. These findings reveal a new therapeutic potential of diosgenin for human breast cancer metastasis therapy.
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Affiliation(s)
- Zhongmei He
- College of Chinese Medicine Materials, Jilin Agricultural University, Changchun 130118, China
| | - Hongyan Chen
- College of Chinese Medicine Materials, Jilin Agricultural University, Changchun 130118, China
| | - Guofeng Li
- The First Affiliated Hospital of Changchun University of Traditional Medicine, Changchun University of Traditional Chinese Medicine, Changchun 130021, China
| | - Hongyan Zhu
- College of Chinese Medicine Materials, Jilin Agricultural University, Changchun 130118, China
| | - Yugang Gao
- College of Chinese Medicine Materials, Jilin Agricultural University, Changchun 130118, China
| | - Lianxue Zhang
- College of Chinese Medicine Materials, Jilin Agricultural University, Changchun 130118, China.
| | - Jiaming Sun
- Development Center of Traditional Chinese Medicine and Bioengineering, Changchun University of Traditional Chinese Medicine, Changchun 130117, China.
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Maurya VK, Sangappa C, Kumar V, Mahfooz S, Singh A, Rajender S, Jha RK. Expression and activity of Rac1 is negatively affected in the dehydroepiandrosterone induced polycystic ovary of mouse. J Ovarian Res 2014; 7:32. [PMID: 24628852 PMCID: PMC3995551 DOI: 10.1186/1757-2215-7-32] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2013] [Accepted: 02/22/2014] [Indexed: 02/07/2023] Open
Abstract
Background Polycystic ovarian syndrome (PCOS) is characterized by the presence of multiple follicular cysts, giving rise to infertility due to anovulation. This syndrome affects about 10% of women, worldwide. The exact molecular mechanism leading to PCOS remains obscure. RhoGTPase has been associated with oogenesis, but its role in PCOS remains unexplored. Therefore, we attempted to elucidate the Vav-Rac1 signaling in PCOS mice model. Methods We generated a PCOS mice model by injecting dehydroepiandrosterone (DHEA) for a period of 20 days. The expression levels of Rac1, pRac1, Vav, pVav and Caveolin1 were analyzed by employing immuno-blotting and densitometry. The association between Vav and Rac1 proteins were studied by immuno-precipitation. Furthermore, we analyzed the activity of Rac1 and levels of inhibin B and 17β-estradiol in ovary using biochemical assays. Results The presence of multiple follicular cysts in ovary were confirmed by histology. The activity of Rac1 (GTP bound state) was significantly reduced in the PCOS ovary. Similarly, the expression levels of Rac1 and its phosphorylated form (pRac1) were decreased in PCOS in comparison to the sham ovary. The expression level and activity (phosphorylated form) of guanine nucleotide exchanger of Rac1, Vav, was moderately down-regulated. We observed comparatively increased expressions of Caveolin1, 17β-estradiol, and inhibin B in the polycystic ovary. Conclusion We conclude that hyperandrogenization (PCOS) by DHEA diminishes ovarian Rac1 and Vav expression and activity along with an increase in expression of Caveolin1. This is accompanied by an increase in the intra-ovarian level of '17 β-estradiol and inhibin B.
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Affiliation(s)
| | | | | | | | | | | | - Rajesh Kumar Jha
- Division of Endocrinology, Life Science North 111B/101, CSIR-Central Drug Research Institute, B,S, 10/1, Sector-10, Jankipuram Extension, Sitapur Road, Lucknow 226031, India.
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Abe T, Hirasaka K, Kohno S, Ochi A, Yamagishi N, Ohno A, Teshima-Kondo S, Nikawa T. Ubiquitin ligase Cbl-b and obesity-induced insulin resistance. Endocr J 2014; 61:529-38. [PMID: 24614797 DOI: 10.1507/endocrj.ej14-0048] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Obesity causes type 2 diabetes, atherosclerosis and cardiovascular diseases by inducing systemic insulin resistance. It is now recognized that obesity is related to chronic low-grade inflammation in adipose tissue. Specifically, activated immune cells infiltrate adipose tissue and cause inflammation. There is increasing evidence that activated macrophages accumulate in the hypertrophied adipose tissue of rodents and humans and induce systemic insulin resistance by secreting inflammatory cytokines. Accordingly, a better understanding of the molecular mechanisms underlying macrophage activation in adipose tissue will facilitate the development of new therapeutic strategies. Currently, little is known about the regulation of macrophage activation, although E3 ubiquitin ligase Casitas B-lineage lymphoma (Cbl)-b was identified recently as a novel negative regulator of macrophage activation in adipose tissue. Cbl-b, which is a suppressor of T- and B-cell activation, inhibits intracellular signal transduction by targeting some tyrosine kinases. Notably, preventing Cbl-b-mediated macrophage activation improves obesity-induced insulin resistance in mice. c-Cbl is another member of the Cbl family that is associated with insulin resistance in obesity. These reports suggest that Cbl-b and c-Cbl are potential therapeutic targets for treating obesity-induced insulin resistance. In this review, we focus on the importance of Cbl-b in macrophage activation in aging-induced and high-fat diet-induced obesity.
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Affiliation(s)
- Tomoki Abe
- Department of Nutritional Physiology, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima 770-8503, Japan
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