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https://www.readbyqxmd.com/read/28636560/lipocalin-2-regulates-intestine-bacterial-survival-by-interplaying-with-siderophore-in-a-weaned-piglet-model-of-escherichia-coli-infection
#1
Bing-Xiu Guo, Qian-Qian Wang, Jia-Hui Li, Zhen-Shun Gan, Xiao-Feng Zhang, Yi-Zhen Wang, Hua-Hua Du
Iron is an essential nutrient that facilitates cell proliferation and growth, which plays a pivotal role in modulating the battle for survival between mammalian hosts and their pathogens. Pathogenic bacteria secrete siderophores to acquire iron from the host. However, lipocalin 2 (Lcn2), a siderophore-binding antimicrobial protein, binds to siderophores to prevent bacterial uptake of iron, which is critical for the control of systemic infection with Escherichia coli (E. coli). But few studies focus on the anti-infective response of Lcn2 in the intestines by inhibiting bacterial proliferation based on microbial iron metabolism...
June 16, 2017: Oncotarget
https://www.readbyqxmd.com/read/28628361/lipocalin-2-an-emerging-player-in-iron-homeostasis-and-inflammation
#2
Xia Xiao, Beng San Yeoh, Matam Vijay-Kumar
Lipocalin 2 (Lcn2), an innate immune protein, has emerged as a critical iron regulatory protein during physiological and inflammatory conditions. As a bacteriostatic factor, Lcn2 obstructs the siderophore iron-acquiring strategy of bacteria and thus inhibits bacterial growth. As part of host nutritional immunity, Lcn2 facilitates systemic, cellular, and mucosal hypoferremia during inflammation, in addition to stabilizing the siderophore-bound labile iron pool. In this review, we summarize recent advances in understanding the interaction between Lcn2 and iron, and its effects in various inflammatory diseases...
June 19, 2017: Annual Review of Nutrition
https://www.readbyqxmd.com/read/28615213/experimental-and-human-evidence-for-lipocalin-2-neutrophil-gelatinase-associated-lipocalin-ngal-in-the-development-of-cardiac-hypertrophy-and-heart-failure
#3
Francine Z Marques, Priscilla R Prestes, Sean G Byars, Scott C Ritchie, Peter Würtz, Sheila K Patel, Scott A Booth, Indrajeetsinh Rana, Yosuke Minoda, Stuart P Berzins, Claire L Curl, James R Bell, Bryan Wai, Piyush M Srivastava, Antti J Kangas, Pasi Soininen, Saku Ruohonen, Mika Kähönen, Terho Lehtimäki, Emma Raitoharju, Aki Havulinna, Markus Perola, Olli Raitakari, Veikko Salomaa, Mika Ala-Korpela, Johannes Kettunen, Maree McGlynn, Jason Kelly, Mary E Wlodek, Paul A Lewandowski, Lea M Delbridge, Louise M Burrell, Michael Inouye, Stephen B Harrap, Fadi J Charchar
BACKGROUND: Cardiac hypertrophy increases the risk of developing heart failure and cardiovascular death. The neutrophil inflammatory protein, lipocalin-2 (LCN2/NGAL), is elevated in certain forms of cardiac hypertrophy and acute heart failure. However, a specific role for LCN2 in predisposition and etiology of hypertrophy and the relevant genetic determinants are unclear. Here, we defined the role of LCN2 in concentric cardiac hypertrophy in terms of pathophysiology, inflammatory expression networks, and genomic determinants...
June 14, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28596835/chronic-diazepam-administration-increases-the-expression-of-lcn2-in-the-cns
#4
Tomonori Furukawa, Shuji Shimoyama, Yasuo Miki, Yoshikazu Nikaido, Kohei Koga, Kazuhiko Nakamura, Koichi Wakabayashi, Shinya Ueno
Benzodiazepines (BZDs), which bind with high affinity to gamma-aminobutyric acid type A receptors (GABAA-Rs) and potentiate the effects of GABA, are widely prescribed for anxiety, insomnia, epileptic discharge, and as anticonvulsants. The long-term use of BZDs is limited due to adverse effects such as tolerance, dependence, withdrawal effects, and impairments in cognition and learning. Additionally, clinical reports have shown that chronic BZD treatment increases the risk of Alzheimer's disease. Unusual GABAA-R subunit expression and GABAA-R phosphorylation are induced by chronic BZD use...
February 2017: Pharmacology Research & Perspectives
https://www.readbyqxmd.com/read/28588704/ell3-stimulates-5-fu-resistance-in-a-breast-cancer-cell-line
#5
Isaac Kim, Kwang-Soo Kim, Ok-Seon Kwon, Hyuk-Jin Cha, Kyung-Soon Park
Ell3 is an RNA polymerase II transcription elongation factor that acts as a negative regulator of p53 expression, and regulates cell proliferation and survival. Recent studies by our group have demonstrated that ectopic expression of Ell3 in breast cancer cell lines enhances cell proliferation, potentiates cancer stem cell properties, and promotes 5-Fluorouracil (5-FU) resistance. In the present study, the underlying mechanism for the induction of 5-FU resistance was investigated in Ell3 over-expressing MCF-7 cells (Ell3 OE cells)...
June 2017: Oncology Letters
https://www.readbyqxmd.com/read/28581123/astrocyte-derived-lipocalin-2-mediates-hippocampal-damage-and-cognitive-deficits-in-experimental-models-of-vascular-dementia
#6
Jae-Hong Kim, Pan-Woo Ko, Ho-Won Lee, Ji-Young Jeong, Maan-Gee Lee, Jong-Heon Kim, Won-Ha Lee, Ri Yu, Won-Jong Oh, Kyoungho Suk
Lipocalin-2 (LCN2) has diverse functions in multiple pathophysiological conditions; however, its pathogenic role in vascular dementia (VaD) is unknown. Here, we investigated the role of LCN2 in VaD using rodent models of global cerebral ischemia and hypoperfusion with cognitive impairment and neuroinflammation. Mice subjected to transient bilateral common carotid artery occlusion (tBCCAo) for 50 min showed neuronal death and gliosis in the hippocampus at 7 days post-tBCCAo. LCN2 expression was observed predominantly in the hippocampal astrocytes, whereas its receptor was mainly detected in neurons, microglia, and astrocytes...
June 5, 2017: Glia
https://www.readbyqxmd.com/read/28573544/lipocalin-2-enhances-mesenchymal-stem-cell-based-cell-therapy-in-acute-kidney-injury-rat-model
#7
Mehryar Habibi Roudkenar, Raheleh Halabian, Hossein Abdul Tehrani, Fatemeh Amiri, Ali Jahanian-Najafabadi, Amaneh Mohammadi Roushandeh, Zahra Abbasi-Malati, Yoshikazu Kuwahara
Acute kidney injury (AKI) is one of the most common health-threatening diseases in the world. There is still no effective medical treatment for AKI. Recently, Mesenchymal stem cell (MSC)-based therapy has been proposed for treatment of AKI. However, the microenvironment of damaged kidney tissue is not favorable for survival of MSCs which would be used for therapeutic intervention. In this study, we genetically manipulated MSCs to up-regulate lipocalin-2 (Lcn2) and investigated whether the engineered MSCs (MSC-Lcn2) could improve cisplatin-induced AKI in a rat model...
June 2, 2017: Cytotechnology
https://www.readbyqxmd.com/read/28529490/microgravity-induced-transcriptome-adaptation-in-mouse-paraspinal-longissimus-dorsi-muscle-highlights-insulin-resistance-linked-genes
#8
Guido Gambara, Michele Salanova, Stefano Ciciliot, Sandra Furlan, Martina Gutsmann, Gudrun Schiffl, Ute Ungethuem, Pompeo Volpe, Hanns-Christian Gunga, Dieter Blottner
Microgravity as well as chronic muscle disuse are two causes of low back pain originated at least in part from paraspinal muscle deconditioning. At present no study investigated the complexity of the molecular changes in human or mouse paraspinal muscles exposed to microgravity. The aim of this study was to evaluate longissimus dorsi adaptation to microgravity at both morphological and global gene expression level. C57BL/N6 male mice were flown aboard the BION-M1 biosatellite for 30 days (BF) or housed in a replicate flight habitat on ground (BG)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28504685/spleen-derived-lipocalin-2-in-the-portal-vein-regulates-kupffer-cells-activation-and-attenuates-the-development-of-liver-fibrosis-in-mice
#9
Tomonori Aoyama, Kyoko Kuwahara-Arai, Akira Uchiyama, Kazuyoshi Kon, Hironao Okubo, Shunhei Yamashina, Kenichi Ikejima, Shigehiro Kokubu, Akihisa Miyazaki, Sumio Watanabe
The liver has an immune tolerance against gut-derived products from the portal vein (PV). A disruption of the gut-liver axis leads to liver injury and fibrosis. The spleen is connected to the PV and regulates immune functions. However, possible splenic effects on liver fibrosis development are unclear. Lipocalin-2 (Lcn2) is an antimicrobial protein that regulates macrophage activation. To clarify the role of the spleen in liver fibrosis development, we induced liver fibrosis in mice after splenectomy, and investigated liver fibrosis development...
May 15, 2017: Laboratory Investigation; a Journal of Technical Methods and Pathology
https://www.readbyqxmd.com/read/28485407/lipocalin-2-regulates-adult-neurogenesis-and-contextual-discriminative-behaviours
#10
A C Ferreira, T Santos, B Sampaio-Marques, A Novais, S D Mesquita, P Ludovico, L Bernardino, M Correia-Neves, N Sousa, J A Palha, J C Sousa, F Marques
In the adult mammalian brain, newborn granule cells are continuously integrated into hippocampal circuits, and the fine-tuning of this process is important for hippocampal function. Thus, the identification of factors that control adult neural stem cells (NSCs) maintenance, differentiation and integration is essential. Here we show that the deletion of the iron trafficking protein lipocalin-2 (LCN2) induces deficits in NSCs proliferation and commitment, with impact on the hippocampal-dependent contextual fear discriminative task...
May 9, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28467300/tcf7l1-promotes-skin-tumorigenesis-independently-of-%C3%AE-catenin-through-induction-of-lcn2
#11
Amy T Ku, Timothy M Shaver, Ajay S Rao, Jeffrey M Howard, Christine N Rodriguez, Qi Miao, Gloria Garcia, Diep Le, Diane Yang, Malgorzata Borowiak, Daniel N Cohen, Vida Chitsazzadeh, Abdul H Diwan, Kenneth Y Tsai, Hoang Nguyen
The transcription factor TCF7L1 is an embryonic stem cell signature gene that is upregulated in multiple aggressive cancer types, but its role in skin tumorigenesis has not yet been defined. Here we document TCF7L1 upregulation in skin squamous cell carcinoma (SCC) and demonstrate that TCF7L1 overexpression increases tumor incidence, tumor multiplicity, and malignant progression in the chemically induced mouse model of skin SCC. Additionally, we show that downregulation of TCF7L1 and its paralogue TCF7L2 reduces tumor growth in a xenograft model of human skin SCC...
May 3, 2017: ELife
https://www.readbyqxmd.com/read/28445245/ectopic-expression-of-innate-immune-protein-lipocalin-2-in-lactococcus-lactis-protects-against-gut-and-environmental-stressors
#12
Piu Saha, Benoit Chassaing, Beng San Yeoh, Emilie Viennois, Xia Xiao, Mary J Kennett, Vishal Singh, Matam Vijay-Kumar
BACKGROUND: Lipocalin-2 (Lcn2) is a multifunctional innate immune protein that exhibits antimicrobial activity by the sequestration of bacterial siderophores, regulates iron homeostasis, and augments cellular tolerance to oxidative stress. Studies in the murine model of colitis have demonstrated that Lcn2 deficiency exacerbates colitogenesis; however, the therapeutic potential of Lcn2 supplementation has yet to be elucidated. In light of its potential mucoprotective functions, we, herein, investigated whether expression of Lcn2 in the probiotic bacterium can be exploited to alleviate experimental colitis...
July 2017: Inflammatory Bowel Diseases
https://www.readbyqxmd.com/read/28432145/bacterial-siderophores-hijack-neutrophil-functions
#13
Piu Saha, Beng San Yeoh, Rodrigo A Olvera, Xia Xiao, Vishal Singh, Deepika Awasthi, Bhagawat C Subramanian, Qiuyan Chen, Madhu Dikshit, Yanming Wang, Carole A Parent, Matam Vijay-Kumar
Neutrophils are the primary immune cells that respond to inflammation and combat microbial transgression. To thrive, the bacteria residing in their mammalian host have to withstand the antibactericidal responses of neutrophils. We report that enterobactin (Ent), a catecholate siderophore expressed by Escherichia coli, inhibited PMA-induced generation of reactive oxygen species (ROS) and neutrophil extracellular traps (NETs) in mouse and human neutrophils. Ent also impaired the degranulation of primary granules and inhibited phagocytosis and bactericidal activity of neutrophils, without affecting their migration and chemotaxis...
June 1, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28410227/subcloning-and-characterization-of-highly-metastatic-cells-derived-from-human-esophageal-squamous-cell-carcinoma-kyse150-cells-by-in-vivo-selection
#14
Masafumi Okuda, Jun Inoue, Naoto Fujiwara, Tatsuyuki Kawano, Johji Inazawa
Esophageal cancer is the eighth most common cancer and the sixth most common cause of cancer-related deaths worldwide. Despite the research progress in understanding the disease, the mechanism underlying the metastasis is still unclear. Here, we successfully generated a highly metastatic cell subline, designated as KYSE150-LuM, derived from an esophageal squamous cell carcinoma cell line (KYSE150) by in vivo selection. To elucidate the mechanisms driving metastasis, we characterized the gene expression differences between LuM cells and parent KYSE150 cells...
May 23, 2017: Oncotarget
https://www.readbyqxmd.com/read/28396286/altered-mitochondrial-and-peroxisomal-integrity-in-lipocalin-2-deficient-mice-with-hepatic-steatosis
#15
Anastasia Asimakopoulou, Annabelle Fülöp, Erawan Borkham-Kamphorst, Eddy Van de Leur, Nikolaus Gassler, Thorsten Berger, Birte Beine, Helmut E Meyer, Tak W Mak, Carsten Hopf, Corinna Henkel, Ralf Weiskirchen
Lipocalin-2 (LCN2) is a secreted adipokine that transports small hydrophobic molecules such as fatty acids and steroids. LCN2 limits bacterial growth by sequestering iron-containing siderophores and in mammalian liver protects against inflammation, infection, injury and other stressors. Because LCN2 modulates hepatic fat metabolism and homeostasis, we performed a comparative profiling of proteins and lipids of wild type (WT) and Lcn2-deficient mice fed either standard chow or a methionine- and choline-deficient (MCD) diet...
April 7, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28385522/transcriptome-analysis-of-the-effects-of-chitosan-on-the-hyperlipidemia-and-oxidative-stress-in-high-fat-diet-fed-mice
#16
Bin Wang, Sicong Zhang, Xiaoya Wang, Shuo Yang, Qixing Jiang, Yanshun Xu, Wenshui Xia
Transcriptome analysis was performed to investigate the alterations in gene expression after chitosan (CS) treatment on the liver of mice fed with high-fat diet (HFD). The results showed that the body weight, the liver weight and the epididymal fat mass of HFD mice, which were 62.98%, 46.51% and 239.37%, respectively, higher than those of control mice, could be significantly decreased by chitosan supplementation. Also, high-fat diet increased both plasma lipid and liver lipid as compared with the control mice...
April 3, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28340561/ascorbic-acid-ameliorates-renal-injury-in-a-murine-model-of-contrast-induced-nephropathy
#17
K Rollins, A Noorani, L Janeckova, T Jones, M Griffiths, M P Baker, J R Boyle
BACKGROUND: Contrast induced nephropathy (CIN) is the commonest cause of iatrogenic renal injury and its incidence has increased with the advent of complex endovascular procedures. Evidence suggests that ascorbic acid (AA) has a nephroprotective effect in percutaneous coronary interventions when contrast media are used. A variety of biomarkers (NGAL, NGAL:creatinine, mononuclear cell infiltration, apoptosis and RBP-4) in both the urine and kidney were assayed using a mouse model of CIN in order to determine whether AA can reduce the incidence and/or severity of renal injury...
March 24, 2017: BMC Nephrology
https://www.readbyqxmd.com/read/28273060/mc4r-dependent-suppression-of-appetite-by-bone-derived-lipocalin-2
#18
Ioanna Mosialou, Steven Shikhel, Jian-Min Liu, Antonio Maurizi, Na Luo, Zhenyan He, Yiru Huang, Haihong Zong, Richard A Friedman, Jonathan Barasch, Patricia Lanzano, Liyong Deng, Rudolph L Leibel, Mishaela Rubin, Thomas Nicholas, Wendy Chung, Lori M Zeltser, Kevin W Williams, Jeffrey E Pessin, Stavroula Kousteni
Bone has recently emerged as a pleiotropic endocrine organ that secretes at least two hormones, FGF23 and osteocalcin, which regulate kidney function and glucose homeostasis, respectively. These findings have raised the question of whether other bone-derived hormones exist and what their potential functions are. Here we identify, through molecular and genetic analyses in mice, lipocalin 2 (LCN2) as an osteoblast-enriched, secreted protein. Loss- and gain-of-function experiments in mice demonstrate that osteoblast-derived LCN2 maintains glucose homeostasis by inducing insulin secretion and improves glucose tolerance and insulin sensitivity...
March 16, 2017: Nature
https://www.readbyqxmd.com/read/28256718/lipocalin-2-is-expressed-by-activated-granulocytes-and-keratinocytes-in-affected-skin-and-reflects-disease-activity-in-acne-inversa-hidradenitis-suppurativa
#19
K Wolk, J Wenzel, A Tsaousi, E Witte-Händel, N Babel, C Zelenak, H-D Volk, W Sterry, S Schneider-Burrus, R Sabat
BACKGROUND: Acne inversa (AI)/Hidradenitis suppurativa is a chronic inflammatory disease characterized by painful axillary, inguinal, and perianal skin lesions with deep-seated nodules, abscesses, and fistulae. OBJECTIVES: This study aimed at the identification and characterization of key players in AI pathogenesis. METHODS: Epidemiologic and anamnestic data as well as blood and skin samples of AI patients were collected. Healthy participants and psoriasis patients served as controls...
March 3, 2017: British Journal of Dermatology
https://www.readbyqxmd.com/read/28255266/lipocalin-2-promotes-endoplasmic-reticulum-stress-and-proliferation-by-augmenting-intracellular-iron-in-human-pulmonary-arterial-smooth-muscle-cells
#20
Guoliang Wang, Shenghua Liu, Li Wang, Liukun Meng, Chuanjue Cui, Hao Zhang, Shengshou Hu, Ning Ma, Yingjie Wei
Endoplasmic reticulum (ER) stress, a feature of many conditions associated with pulmonary hypertension (PH), is increasingly recognized as a common response to promote proliferation in the walls of pulmonary arteries. Increased expression of Lipocalin-2 in PH led us to test the hypothesis that Lipocalin-2, a protein known to sequester iron and regulate it intracellularly, might facilitate the ER stress and proliferation in pulmonary arterial smooth muscle cells (PASMCs). In this study, we observed greatly increased Lcn2 expression accompanied with increased ATF6 cleavage in a standard rat model of pulmonary hypertension induced by monocrotaline...
2017: International Journal of Biological Sciences
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