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Opposite trends of GAS6 and GAS6-AS expressions in breast cancer tissues. Exp Mol Pathol 2020; 118:104600. [PMID: 33359886 DOI: 10.1016/j.yexmp.2020.104600] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 11/26/2020] [Accepted: 12/21/2020] [Indexed: 12/29/2022]
Abstract
Growth arrest-specific gene 6 (GAS6) is a growth factor-like cytokine whose function is related with vitamin K. This protein interacts with receptor tyrosine kinase proteins such as Tyro3, Axl, and TAM Receptor family, therefore affecting the tumorigenic processes via different mechanisms. GAS6-antisense 1 (GAS6-AS1) is a long non-coding RNAs (lncRNAs) that is transcribed from a genomic regions nearby GAS6. This lncRNA is also implicated in the pathobiology of cancer. We intended to judge the role of GAS6 and GAS6-AS1 in the pathogenesis of breast cancer through appraisal of their expression levels in breast cancer tissues and their paired neighboring non-cancerous samples. Expression of GAS6 was up-regulated in breast cancer tissues compared with neighboring tissues (Ratio of Mean Expressions = 2.18, P value = 4.98E-02). On the other hand, expression of GAS6-AS1 was down-regulated in breast tumor tissues compared with controls (Ratio of Mean Expressions = 0.37, P value = 4.26E-03). There were substantial correlations between expression levels GAS6 and GAS6-AS1 in non-cancerous tissues (r = 0.74, P value = 1.47e-13) and cancer tissues (r = 0.85, P value = 2.28e-20). Expression of GAS6-AS was associated with progesterone receptor status (P value = 1.36E-02). However, expressions of this gene and the sense transcript were not linked with any other clinical or demographic variable. Taken together, GAS6 and GAS6-AS1 might partake in the development of breast cancer.
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Bassand JP, Apenteng PN, Atar D, Camm AJ, Cools F, Corbalan R, Fitzmaurice DA, Fox KA, Goto S, Haas S, Hacke W, Jerjes-Sanchez C, Koretsune Y, Heuzey JYL, Sawhney JP, Oh S, Stępińska J, Cate VT, Verheugt FW, Kayani G, Pieper KS, Kakkar AK, Garfield-Af Investigators FT. GARFIELD-AF: a worldwide prospective registry of patients with atrial fibrillation at risk of stroke. Future Cardiol 2020; 17:19-38. [PMID: 32696663 DOI: 10.2217/fca-2020-0014] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
The Global Anticoagulant Registry in the Field-Atrial Fibrillation (GARFIELD-AF) examined real-world practice in a total of 57,149 (5069 retrospective, 52,080 prospective) patients with newly diagnosed AF at risk of stroke/systemic embolism, enrolled at over 1000 centers in 35 countries. It aimed to capture data on AF burden, patients' clinical profile, patterns of clinical practice and antithrombotic management, focusing on stroke/systemic embolism prevention, uptake of new oral anticoagulants, impact on death and bleeding. GARFIELD-AF set new standards for quality of data collection and analysis. A total of 36 peer-reviewed articles were already published and 73 abstracts presented at international congresses, covering treatment strategies, geographical variations in baseline risk and therapies, adverse outcomes and common comorbidities such as heart failure. A risk prediction tool as well as innovative observational studies and artificial intelligence methodologies are currently being developed by GARFIELD-AF researchers. Clinical Trial Registration: NCT01090362 (ClinicalTrials.gov).
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Affiliation(s)
- Jean-Pierre Bassand
- Department of Cardiology, University of Besançon, Besançon 25000, France.,Department of Clinical Research, Thrombosis Research Institute, London SW3 6LR, UK
| | | | - Dan Atar
- Department of Cardiology, Oslo University Hospital Ullevaal, Oslo PO Box 4956, Norway.,Institute of Clinical Science, University of Oslo, Oslo PO Box 4956, Norway
| | - A John Camm
- Molecular & Clinical Sciences Research Institute, St George's University of London, London SW17 0RE, UK
| | - Frank Cools
- Department of Cardiology, AZ Klina, Brasschaat 100, 2930, Belgium
| | - Ramon Corbalan
- Department of Cardiology, Catholic University, Santiago 8330024, Chile
| | | | - Keith Aa Fox
- Centre for Cardiovascular Science, University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Shinya Goto
- Department of Medicine(Cardiology), Tokai University School of Medicine, Kanagawa 259-1143, Japan
| | - Sylvia Haas
- Department of Medicine, Formerly Technical University of Munich, Munich 80333, Germany
| | - Werner Hacke
- Department of Neurology, University of Heidelberg, Heidelberg 69120, Germany
| | | | - Yukihiro Koretsune
- Institute for Clinical Research, Osaka National Hospital, Osaka 540-0006, Japan
| | - Jean-Yves Le Heuzey
- Department of Arrhythmia, European Hospital Georges Pompidou, René Descartes University, Paris 75015, France
| | | | - Seil Oh
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul 110-799, Republic of Korea
| | - Janina Stępińska
- Intensive Cardiac Therapy Clinic, Institute of Cardiology, Warsaw 04-628, Poland
| | - Vincent Ten Cate
- Cardiovascular Research Institute Maastricht, Maastricht 6200, The Netherlands
| | - Freek Wa Verheugt
- Depertment of Cardiology, Onze Lieve Vrouwe Gasthuis, Amsterdam NL-1091-AC, The Netherlands
| | - Gloria Kayani
- Department of Clinical Research, Thrombosis Research Institute, London SW3 6LR, UK
| | - Karen S Pieper
- Department of Clinical Research, Thrombosis Research Institute, London SW3 6LR, UK
| | - Ajay K Kakkar
- Department of Clinical Research, Thrombosis Research Institute, London SW3 6LR, UK.,Department of Surgery, University College London, London WC1E 6BT, UK
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3
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Gas6/TAM Receptors in Systemic Lupus Erythematosus. DISEASE MARKERS 2019; 2019:7838195. [PMID: 31360267 PMCID: PMC6652053 DOI: 10.1155/2019/7838195] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 06/14/2019] [Accepted: 06/25/2019] [Indexed: 01/25/2023]
Abstract
Systemic lupus erythematosus (SLE) is a multiorgan autoimmune disease associated with impaired immune system regulation. The exact mechanisms of SLE development remain to be elucidated. TAM receptor tyrosine kinases (RTKs) are important for apoptotic cell clearance, immune homeostasis, and resolution of immune responses. TAM deficiency leads to lupus-like autoimmune diseases. Activation of TAM receptors leads to proteolytic cleavage of the receptors, generating soluble forms of TAM. Circulating TAM receptors have an immunoregulatory function and may also serve as biomarkers for disease prognosis. Here, we review the biological function and signaling of TAM RTKs in the development and pathogenesis of lupus and lupus nephritis. Targeting Gas6/TAM pathways may be of therapeutic benefit. A discussion of potential TAM activation and inhibition in the treatment of lupus and lupus nephritis is included.
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Axl expression is increased in early stages of left ventricular remodeling in an animal model with pressure-overload. PLoS One 2019; 14:e0217926. [PMID: 31181097 PMCID: PMC6557565 DOI: 10.1371/journal.pone.0217926] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2018] [Accepted: 05/21/2019] [Indexed: 01/24/2023] Open
Abstract
Background AXL is a receptor tyrosine kinase that has been related to kidney and vascular disorders. Heart failure patients with reduced ejection fraction have higher AXL in serum than controls. No information about Axl expression with HF progression is available. Methods Thoracic transverse aortic constriction (TAC) was successfully performed on male Wistar rats (n = 25) with different constriction levels. Controls underwent sham surgery (n = 12). Echocardiography measurements were performed 4–8 weeks after surgery. Collagen deposition was measured with picrosirius red staining. Axl mRNA levels in left ventricle (LV), left kidney (LK) and ascending aorta (aAo) and the LV expression of cardiac remodeling and fibrogenic factors were quantified with real-time PCR. AXL LV protein levels were quantified with western blot and localization was analyzed by immunohistochemistry. Soluble AXL levels in plasma were assayed with ELISA. Results Successful TAC rats were classified into LV hypertrophy (LVH) or heart failure (HF), modeling the progressive cardiac changes after pressure overload. Collagen deposition was increased only in the HF group. LV Axl mRNA levels were higher in LVH and HF than in Sham rats, and correlated with LVHi, and hypertrophic and fibrogenic mediators. However, no association was found with LV systolic function. AXL was expressed in LV myocytes and other cell types. Concentration of circulating sAXL in plasma was increased in the LVH group compared to Sham and HF rats. Axl mRNA levels were similar in all groups in the LK and aAo. Conclusions Axl expression pattern suggests a role in the early progression of LV remodeling in HF but not in the later systolic dysfunction. The higher levels of circulating AXL found in HF patients most probably shed from the heart.
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Zhong F, Chen H, Xie Y, Azeloglu EU, Wei C, Zhang W, Li Z, Chuang PY, Jim B, Li H, Elmastour F, Riyad JM, Weber T, Chen H, Wang Y, Zhang A, Jia W, Lee K, He JC. Protein S Protects against Podocyte Injury in Diabetic Nephropathy. J Am Soc Nephrol 2018; 29:1397-1410. [PMID: 29511111 DOI: 10.1681/asn.2017030234] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Accepted: 02/05/2018] [Indexed: 11/03/2022] Open
Abstract
Background Diabetic nephropathy (DN) is a leading cause of ESRD in the United States, but the molecular mechanisms mediating the early stages of DN are unclear.Methods To assess global changes that occur in early diabetic kidneys and to identify proteins potentially involved in pathogenic pathways in DN progression, we performed proteomic analysis of diabetic and nondiabetic rat glomeruli. Protein S (PS) among the highly upregulated proteins in the diabetic glomeruli. PS exerts multiple biologic effects through the Tyro3, Axl, and Mer (TAM) receptors. Because increased activation of Axl by the PS homolog Gas6 has been implicated in DN progression, we further examined the role of PS in DN.Results In human kidneys, glomerular PS expression was elevated in early DN but suppressed in advanced DN. However, plasma PS concentrations did not differ between patients with DN and healthy controls. A prominent increase of PS expression also colocalized with the expression of podocyte markers in early diabetic kidneys. In cultured podocytes, high-glucose treatment elevated PS expression, and PS knockdown further enhanced the high-glucose-induced apoptosis. Conversely, PS overexpression in cultured podocytes dampened the high-glucose- and TNF-α-induced expression of proinflammatory mediators. Tyro3 receptor was upregulated in response to high glucose and mediated the anti-inflammatory response of PS. Podocyte-specific PS loss resulted in accelerated DN in streptozotocin-induced diabetic mice, whereas the transient induction of PS expression in glomerular cells in vivo attenuated albuminuria and podocyte loss in diabetic OVE26 mice.Conclusions Our results support a protective role of PS against glomerular injury in DN progression.
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Affiliation(s)
- Fang Zhong
- Renal Section, James J. Peters Veterans Affairs Medical Center, Bronx, New York.,Division of Nephrology, Department of Medicine.,Department of Nephrology, Hang Zhou Hospital of Traditional Chinese Medicine, Zhejiang Chinese Medical University, Hangzhou, China
| | - Haibing Chen
- Department of Endocrinology and Metabolism, Shanghai Clinical Center for Diabetes, Shanghai Diabetes Institute, Shanghai Key Laboratory of Diabetes Mellitus, Shanghai Jiaotong University Affiliated Sixth People's Hospital, Shanghai, China
| | - Yifan Xie
- Division of Nephrology, Department of Medicine.,Department of Pediatric Nephrology, Nanjing Medical University, Nanjing, China
| | | | | | | | - Zhengzhe Li
- Division of Nephrology, Department of Medicine
| | | | - Belinda Jim
- Division of Nephrology, Jacobi Medical Center, Bronx, New York; and
| | - Hong Li
- Center for Advanced Proteomics Research, Rutgers University, Newark, New Jersey
| | | | | | - Thomas Weber
- Division of Cardiology, Department of Medicine, and.,Graduate School of Biomedical Sciences, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Hongyu Chen
- Department of Nephrology, Hang Zhou Hospital of Traditional Chinese Medicine, Zhejiang Chinese Medical University, Hangzhou, China
| | - Yongjun Wang
- Department of Nephrology, Hang Zhou Hospital of Traditional Chinese Medicine, Zhejiang Chinese Medical University, Hangzhou, China
| | - Aihua Zhang
- Department of Pediatric Nephrology, Nanjing Medical University, Nanjing, China
| | - Weiping Jia
- Department of Endocrinology and Metabolism, Shanghai Clinical Center for Diabetes, Shanghai Diabetes Institute, Shanghai Key Laboratory of Diabetes Mellitus, Shanghai Jiaotong University Affiliated Sixth People's Hospital, Shanghai, China
| | - Kyung Lee
- Division of Nephrology, Department of Medicine,
| | - John C He
- Renal Section, James J. Peters Veterans Affairs Medical Center, Bronx, New York; .,Division of Nephrology, Department of Medicine.,Department of Pharmacological Sciences
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Uchida M, Miyoshi T, Miyamoto Y. Pharmacological effects of a vitamin K 1 2,3-epoxide reductase (VKOR) inhibitor, 3-acetyl-5-methyltetronic acid, on cisplatin-induced fibrosis in rats. J Vet Med Sci 2017; 79:1507-1515. [PMID: 28717059 PMCID: PMC5627320 DOI: 10.1292/jvms.17-0216] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Cisplatin (CDDP) is a chemotherapeutic agent that is widely used in the treatment of lymphomas and solid malignancies. However, its clinical usage is limited by its severe side effects in the kidneys. Glomerular and tubular
injuries in the kidneys commonly progress to interstitial fibrosis and, ultimately, the end stage of renal failure. We previously reported that 3-acetyl-5-methyltetronic acid (AMT) had inhibitory effects on rat renal vitamin
K1 2,3-epoxide reductase (VKOR) in vitro and also suppressed mesangial cell proliferation and, consequently, the formation of fibrosis via the vitamin K-dependent activation of the growth
arrest-specific 6 (Gas6)/Axl pathway in anti-Thy-1 glomerulonephritis (Thy-1 GN) in rats. In the present study, we demonstrated that AMT alleviated the progression of renal fibrosis in CDDP-treated rats. The repeated intravenous
administration of AMT for 28 days dose-dependently suppressed increases in plasma urea nitrogen and plasma creatinine levels as well as creatinine clearance in CDDP-treated rats. Furthermore, the treatment suppressed the
expression of α-smooth muscle actin (SMA)-positive cells and ameliorated the extracellular matrix accumulation of collagen III, indicating an antifibrotic effect. In conclusion, our toxicological and histopathological results
demonstrated quantitatively the pharmacological inhibitory effects of AMT on the progression of renal fibrosis in CDDP-treated rats.
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Affiliation(s)
- Masashi Uchida
- Toxicology and Pharmacokinetics Laboratories, Pharmaceutical Research Laboratories, Toray Industries, Inc., 6-10-1 Tebiro, Kamakura, Kanagawa 248-8555, Japan
| | - Tomoya Miyoshi
- Toxicology and Pharmacokinetics Laboratories, Pharmaceutical Research Laboratories, Toray Industries, Inc., 6-10-1 Tebiro, Kamakura, Kanagawa 248-8555, Japan
| | - Yohei Miyamoto
- Toxicology and Pharmacokinetics Laboratories, Pharmaceutical Research Laboratories, Toray Industries, Inc., 6-10-1 Tebiro, Kamakura, Kanagawa 248-8555, Japan.,Pharmaceutical Clinical Research Department, Toray Industries, Inc., 1-1, Nihonbashi-muromachi 2-chome, Chuo-ku, Tokyo 103-8666, Japan
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7
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Zhen Y, Priest SO, Shao WH. Opposing Roles of Tyrosine Kinase Receptors Mer and Axl Determine Clinical Outcomes in Experimental Immune-Mediated Nephritis. THE JOURNAL OF IMMUNOLOGY 2016; 197:2187-94. [PMID: 27527599 DOI: 10.4049/jimmunol.1600793] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Accepted: 07/18/2016] [Indexed: 12/16/2022]
Abstract
Glomerulonephritis is one of the most severe manifestations of systemic lupus erythematosus, with considerable morbidity and mortality. There remains a major unmet need for successful management of lupus nephritis. TAM family receptor tyrosine kinases (Mer and Axl) play an important role in the maintenance of immune homeostasis in the kidney. Mer is constitutively expressed in the glomeruli; Axl expression is inducible in glomeruli under inflammatory conditions. To investigate the distinct functions of Axl and Mer in lupus nephritis, we compared the severity of nephrotoxic serum glomerulonephritis in wild-type (WT), Axl-knockout (KO), Mer-KO, and Axl/Mer-KO mice. Mer-KO mice developed severe glomerulonephritis, with significantly decreased survival and increased blood urea nitrogen levels compared with WT mice given the same treatment. However, nephrotoxic serum-treated Axl-KO mice had significantly increased survival rates and improved renal function compared with similarly treated WT, Mer-KO, and Axl/Mer-KO mice. Interestingly, mice lacking both Axl and Mer developed kidney inflammation comparable to WT mice. Western blot analysis revealed significantly increased Stat3 phosphorylation and caspase-1 activation in the kidneys of nephritic Mer-KO mice. In contrast, Axl-deficient nephrotoxic serum-injected mice showed decreased Akt phosphorylation and Bcl-xL upregulation. Thus, the reciprocal activation of Axl and Mer receptor tyrosine kinases has a major impact on the outcome of renal inflammation.
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Affiliation(s)
- Yuxuan Zhen
- Section of Rheumatology, Department of Medicine, Temple University, Philadelphia, PA 19140
| | - Stephen O Priest
- Section of Rheumatology, Department of Medicine, Temple University, Philadelphia, PA 19140
| | - Wen-Hai Shao
- Section of Rheumatology, Department of Medicine, Temple University, Philadelphia, PA 19140
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Kong Y, Du X, Tang RB, Zhang T, Guo XY, Wu JH, Xia SJ, Ma CS. Whether Warfarin Therapy is Associated with Damage on Renal Function in Chinese Patients with Nonvalvular Atrial Fibrillation. Chin Med J (Engl) 2016; 129:1135-9. [PMID: 27174319 PMCID: PMC4878156 DOI: 10.4103/0366-6999.181970] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Background: Warfarin is the most common oral anticoagulant to decrease the stroke risk associated with atrial fibrillation (AF). There are very few prospective studies that have explored whether warfarin has an association with damage on renal function in Chinese patients with nonvalvular AF (NVAF). The aim of this study was to evaluate the effects of warfarin on renal function and study the factors associated with kidney dysfunction in Chinese adult NVAF patients without dialysis therapy. Methods: From January 2011 to December 2013, a total of 951 NVAF patients from 18 hospitals were enrolled. The estimated glomerular filtration rate (eGFR) was calculated from baseline and follow-up serum creatinine levels. Kaplan–Meier survival curves compared the survival of a ≥25% decline in eGFR (hereafter, endpoint), while Cox models estimated hazard ratios (HRs) and 95% confidence intervals for this event after adjustment for age, gender, and selected potential risk factors for renal dysfunction. Cox regression analysis of the various clinical potential variables was performed to identify the predictors of a ≥25% decline in eGFR. Results: After a 58-month follow-up, 951 NVAF patients were divided by observation into warfarin (n = 655) and no anticoagulation groups (n = 296) and 120 (12.6%) patients experienced renal endpoint. Kaplan–Meier survival curves showed that the survival period was not different in the two groups (χ2 = 0.178, log-rank P = 0.67), but patients with systolic blood pressure (SBP) <140 mmHg have significant difference with patients with SBP ≥140 mmHg (χ2 = 4.903, log-rank P = 0.03). Multivariate Cox regression analysis revealed baseline eGFR and SBP as independent predictors of the endpoint, with HRs of 1.00, and 1.02, respectively. Conclusion: In patients with NVAF, eGFR and SBP are associated with the deterioration of kidney function while Warfarin is not the risk factor of the ≥25% decline in eGFR. Trial Registration: Chinese Clinical Trial Registry (No. ChiCTR-OCH-13003729); http://www.chictr.org.cn/showproj.aspx?proj = 5831.
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Affiliation(s)
- Yu Kong
- Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, China
| | - Xin Du
- Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, China
| | - Ri-Bo Tang
- Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, China
| | - Ting Zhang
- Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, China
| | - Xue-Yuan Guo
- Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, China
| | - Jia-Hui Wu
- Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, China
| | - Shi-Jun Xia
- Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, China
| | - Chang-Sheng Ma
- Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, China
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Erek-Toprak A, Bingol-Ozakpinar O, Karaca Z, Cikrikcioglu MA, Hursitoglu M, Uras AR, Adeli K, Uras F. Association of plasma growth arrest-specific protein 6 (Gas6) concentrations with albuminuria in patients with type 2 diabetes. Ren Fail 2014; 36:737-42. [PMID: 24512357 DOI: 10.3109/0886022x.2014.883997] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Affiliation(s)
- Aybala Erek-Toprak
- Department of Biochemistry Istanbul, Istanbul Medeniyet University School of Medicine , Istanbul , Turkey
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10
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Batchu SN, Hughson A, Gerloff J, Fowell DJ, Korshunov VA. Role of Axl in early kidney inflammation and progression of salt-dependent hypertension. Hypertension 2013; 62:302-9. [PMID: 23774230 PMCID: PMC3822523 DOI: 10.1161/hypertensionaha.113.01382] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The Gas6/Axl pathway regulates many cell functions and is implicated in hypertension. In this study, we aimed to investigate the role of Axl in immune cells on initiation and progression of salt-dependent hypertension. Deoxycorticosterone acetate (75 mg/60 days release)-salt hypertension was induced for 1 week or 6 weeks in Axl chimeras generated by bone marrow transplant to restrict Axl deficiency to hematopoietic or nonhematopoietic compartments. Depletion of Axl in hematopoietic cells (Axl(-/-) →Axl(+/+)) reduced (133 ± 2 mm Hg) increase in systolic blood pressure compared with other Axl chimeras (≈150 mm Hg) 1 week after deoxycorticosterone acetate-salt. Urine protein and renal oxidative stress were lowest in Axl(-/-) →Axl(+/+) at 1 week after deoxycorticosterone acetate-salt. Compensatory increase in Gas6 in kidneys of recipient Axl(-/-) may affect kidney function and blood pressure in early phase of hypertension. Flow cytometry on kidneys from Axl(-/-) →Axl(+/+) showed increase in total leukocytes, B, and dendritic cells and decrease in macrophages compared with Axl(+/+) →Axl(+/+). These immune changes were associated with decrease in proinflammatory gene expression, in particular interferon γ. Systolic blood pressure returned to baseline in Axl(-/-) →Axl(+/+) and Axl(-/-) →Axl(-/-) but remained increased in Axl(+/+) →Axl(+/+) and Axl(+/+) →Axl(-/-) chimeras after 6 weeks of deoxycorticosterone acetate-salt. Vascular apoptosis was increased in the global Axl(-/-) chimeras in the late phase of hypertension. In summary, we found that expression of Axl in hematopoietic cells is critical for kidney pathology in early phase of salt-dependent hypertension. However, Axl in both hematopoietic and nonhematopoietic lineages contributes to the late phase of hypertension.
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Affiliation(s)
- Sri N Batchu
- Department of Medicine and Aab Cardiovascular Research Institute, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
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11
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Chang CC, Liou HH, Wu CL, Chang CB, Chang YJ, Chiu PF, Huang CH. Warfarin slows deterioration of renal function in elderly patients with chronic kidney disease and atrial fibrillation. Clin Interv Aging 2013; 8:523-9. [PMID: 23696697 PMCID: PMC3656645 DOI: 10.2147/cia.s44242] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Background The purpose of this study was to examine whether long-term use of anticoagulants in elderly patients with atrial fibrillation (AF) and chronic kidney disease (CKD) influences renal function. Methods In this retrospective observational study, we reviewed the records of 2023 patients who attended our institution for treatment of CKD between January 2001 and September 2012. Inclusion criteria were having been under review for three months or more, age older than 60 years, permanent AF, a CHADS2 score > 2, and National Kidney Foundation Kidney Disease Outcomes Quality Initiative CKD stage 3–5. Sixty-one patients fulfilled these criteria, and were divided into those receiving antiplatelet anticoagulation (group A) and those receiving warfarin (group B). The results of laboratory investigations and estimated glomerular filtration rate (GFR) were recorded at months 3, 6, 12, and 18 from treatment initiation. We also recorded the occurrence of serious cardiovascular and neurological events, significant bleeding, and survival beyond 12 years. Results Of the 61 patients enrolled, 35 were in group A and 26 were in group B. The mean international normalized ratio (INR) was 1.95 ± 1.01 (goal < 3.0). After adjustment for potential confounding variables, we found that patients in group B had a higher estimated GFR (6.06 ± 2.36 mL per minute, P = 0.01). Over a 12-year observation period, group B patients had significantly (P = 0.013) better survival than group A, with an adjusted hazard ratio for mortality of 0.318 (P = 0.022). Conclusion Warfarin therapy may delay deterioration in renal function and improve survival of elderly patients with CKD and AF.
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Affiliation(s)
- Chia-Chu Chang
- Division of Nephrology, Department of Internal Medicine, Changhua Christian Hospital, Changhua, Taiwan
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12
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Vascular Gas6 contributes to thrombogenesis and promotes tissue factor up-regulation after vessel injury in mice. Blood 2012; 121:692-9. [PMID: 23149844 DOI: 10.1182/blood-2012-05-433730] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Gas6 (growth-arrest specific gene 6) plays a role in thrombus stabilization. Gas6 null (-/-) mice are protected from lethal venous and arterial thromboembolism through platelet signaling defects induced only by 5 μM ADP and 10 μM of the thromboxane analog, U46619. This subtle platelet defect, despite a dramatic clinical phenotype, raises the possibility that Gas6 from a source other than platelets contributes to thrombus formation. Thus, we hypothesize that Gas6 derived from the vascular wall plays a role in venous thrombus formation. Bone marrow transplantation and platelet depletion/reconstitution experiments generating mice with selective ablations of Gas6 from either the hematopoietic or nonhematopoietic compartments demonstrate an approximately equal contribution by Gas6 from both compartments to thrombus formation. Tissue factor expression was significantly reduced in the vascular wall of Gas6(-/-) mice compared with WT. In vitro, thrombin-induced tissue factor expression was reduced in Gas6(-/-) endothelial cells compared with wild-type endothelium. Taken together, these results demonstrate that vascular Gas6 contributes to thrombus formation in vivo and can be explained by the ability of Gas6 to promote tissue factor expression and activity. These findings support the notion that vascular wall-derived Gas6 may play a pathophysiologic role in venous thromboembolism.
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13
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Plasma concentrations of growth arrest specific protein 6 and the soluble form of its tyrosine kinase receptor Axl in patients with systemic lupus erythematosus and Behçets disease. J Clin Immunol 2012; 32:1279-86. [PMID: 22833165 DOI: 10.1007/s10875-012-9743-7] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2012] [Accepted: 07/16/2012] [Indexed: 12/30/2022]
Abstract
PURPOSE The aim of the present study was to investigate plasma concentrations of Gas6 and its soluble tyrosine kinase receptor sAxl in Systemic lupus erythematosus (SLE) and Behçets disease (BD) patients and to correlate those levels with clinical and laboratory manifestations of the diseases. METHODS The study included 89 female SLE and 49 male BD patients. Twenty-seven age and sex matched healthy volunteers served as controls. All patients were subjected to full clinical examination, laboratory investigations and assessment of disease activity. Plasma concentrations of Gas6 and sAxl were quantified using ELISA technique. RESULTS The level of Gas6 and Axl were significantly altered in the SLE patients (p < 0.001) and in the BD patients (p 0.001 and 0.04 respectively) compared to those of the control. In SLE, the Gas6 was remarkably lower in those with class 1 lupus nephritis and in those with neuropsychiatric manifestations. In the BD patients, the level of Axl was significantly increased in those with neurological disease activity. The number of lymphocytes significantly negatively correlated with the gas6 and Axl levels significantly correlated with the number of neutrophils and negatively with the lymphocytic count in the BD patients. CONCLUSION The plasma concentrations of Gas6 and Axl were significantly altered in SLE and BD patients, suggesting that the Axl receptor shedding is an active process affected by and influences Gas6-mediated Axl-signaling in both diseases. Special attention is required in SLE patients with early lupus nephritis and neuropsychiatric manifestations and BD patients presenting with neurological disease activity. The relation with lymphocytes and neutrophils in BD throws light on the role of gas6 and Axl on their known resistance to cell death. Although the mechanisms responsible for the initiation of BD remain to be clarified, the role of the apoptotic process seems critical throughout the disease.
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Abstract
Axl is a receptor tyrosine kinase that was originally cloned from cancer cells. Axl belongs to the TAM (Tyro3, Axl and Mertk) family of receptor tyrosine kinases. Gas6 (growth-arrest-specific protein 6) is a ligand for Axl. Activation of Axl protects cells from apoptosis, and increases migration, aggregation and growth through multiple downstream pathways. Up-regulation of the Gas6/Axl pathway is more evident in pathological conditions compared with normal physiology. Recent advances in Axl receptor biology are summarized in the present review. The emphasis is given to translational aspects of Axl-dependent signalling under pathological conditions. In particular, inhibition of Axl reduces tumorigenesis and prevents metastasis as well. Axl-dependent signals are important for the progression of cardiovascular diseases. In contrast, deficiency of Axl in innate immune cells contributes to the pathogenesis of autoimmune disorders. Current challenges in Axl biology are related to the functional interactions of Axl with other members of the TAM family or other tyrosine kinases, mechanisms of ligand-independent activation, inactivation of the receptor and cell-cell interactions (with respect to immune cells) in chronic diseases.
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UCHIDA M, SAKAGUCHI Y, MIYAMOTO Y. A Novel Vitamin K 1 2,3-Epoxide Reductase (VKOR) Inhibitor, 3-Acetyl-5-Methyltetronic Acid, Reduces Experimental Glomerulonephritis. J Vet Med Sci 2012; 74:863-9. [DOI: 10.1292/jvms.11-0530] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
- Masashi UCHIDA
- Toxicology and Pharmacokinetics Laboratories, Pharmaceutical Research Laboratories, Toray Industries, Inc., 6–10–1 Tebiro, Kamakura, Kanagawa 248–8555, Japan
| | - Yuka SAKAGUCHI
- Toxicology and Pharmacokinetics Laboratories, Pharmaceutical Research Laboratories, Toray Industries, Inc., 6–10–1 Tebiro, Kamakura, Kanagawa 248–8555, Japan
| | - Yohei MIYAMOTO
- Toxicology and Pharmacokinetics Laboratories, Pharmaceutical Research Laboratories, Toray Industries, Inc., 6–10–1 Tebiro, Kamakura, Kanagawa 248–8555, Japan
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Caberoy NB, Zhou Y, Li W. Tubby and tubby-like protein 1 are new MerTK ligands for phagocytosis. EMBO J 2010; 29:3898-910. [PMID: 20978472 DOI: 10.1038/emboj.2010.265] [Citation(s) in RCA: 128] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2010] [Accepted: 09/27/2010] [Indexed: 12/29/2022] Open
Abstract
Tubby and tubby-like protein 1 (Tulp1) are newly identified phagocytosis ligands to facilitate retinal pigment epithelium (RPE) and macrophage phagocytosis. Both proteins without classical signal peptide have been demonstrated with unconventional secretion. Here, we characterized them as novel MerTK ligands to facilitate phagocytosis. Tulp1 interacts with Tyro3, Axl and MerTK of the TAM receptor tyrosine kinase subfamily, whereas tubby binds only to MerTK. Excessive soluble MerTK extracellular domain blocked tubby- or Tulp1-mediated phagocytosis. Both ligands induced MerTK activation with receptor phosphorylation and signalling cascade, including non-muscle myosin II redistribution and co-localization with phagosomes. Tubby and Tulp1 are bridging molecules with their N-terminal region as MerTK-binding domain and C-terminal region as phagocytosis prey-binding domain (PPBD). Five minimal phagocytic determinants (MPDs) of K/R(X)(1-2)KKK in Tulp1 N-terminus were defined as essential motifs for MerTK binding, receptor phosphorylation and phagocytosis. PPBD was mapped to the highly conserved 54 amino acids at the C-terminal end of tubby and Tulp1. These data suggest that tubby and Tulp1 are novel bridging molecules to facilitate phagocytosis through MerTK.
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Affiliation(s)
- Nora B Caberoy
- Department of Ophthalmology, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL 33136, USA
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17
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Historical chronology of basic and clinical research in diabetic nephropathy and contributions of Japanese scientists. Clin Exp Nephrol 2009; 13:405-414. [PMID: 19363645 DOI: 10.1007/s10157-009-0175-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2008] [Accepted: 03/02/2009] [Indexed: 10/20/2022]
Abstract
The most problematic issue in clinical nephrology worldwide is the relentless and progressive increase in patients with end-stage renal disease (ESRD). Diabetic nephropathy has considerable impact on society in the areas of public health and social economy; many scientists are involved in research for the elucidation of the pathogenesis of diabetic nephropathy and for the prevention and cure of the disease. In contrast, diabetic nephropathy was a neglected or ignored disease in the historical era, and few dedicated physicians recognized the disease process of diabetic nephropathy. In this review, we look back on the history of basic and clinical research on diabetic nephropathy and survey the recent progress of the research, especially focusing on the contribution of Japanese scientists.
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Skinner MK, Schmidt M, Savenkova MI, Sadler-Riggleman I, Nilsson EE. Regulation of granulosa and theca cell transcriptomes during ovarian antral follicle development. Mol Reprod Dev 2008; 75:1457-72. [PMID: 18288646 PMCID: PMC5749411 DOI: 10.1002/mrd.20883] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Coordinated interactions between ovarian granulosa and theca cells are required for female endocrine function and fertility. To elucidate these interactions the regulation of the granulosa and theca cell transcriptomes during bovine antral follicle development were investigated. Granulosa cells and theca cells were isolated from small (<5 mm), medium (5-10 mm), and large (>10 mm) antral bovine follicles. A microarray analysis of 24,000 bovine genes revealed that granulosa cells and theca cells each had gene sets specific to small, medium and large follicle cells. Transcripts regulated (i.e., minimally changed 1.5-fold) during antral follicle development for the granulosa cells involved 446 genes and for theca cells 248 genes. Only 28 regulated genes were common to both granulosa and theca cells. Regulated genes were functionally categorized with a focus on growth factors and cytokines expressed and regulated by the two cell types. Candidate regulatory growth factor proteins mediating both paracrine and autocrine cell-cell interactions include macrophage inflammatory protein (MIP1 beta), teratocarcinoma-derived growth factor 1 (TDGF1), stromal derived growth factor 1 (SDF1; i.e., CXCL12), growth differentiation factor 8 (GDF8), glia maturation factor gamma (GMFG), osteopontin (SPP1), angiopoietin 4 (ANGPT4), and chemokine ligands (CCL 2, 3, 5, and 8). The current study examined granulosa cell and theca cell regulated genes associated with bovine antral follicle development and identified candidate growth factors potentially involved in the regulation of cell-cell interactions required for ovarian function.
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Affiliation(s)
- Michael K Skinner
- Center for Reproductive Biology, School of Molecular Biosciences, Washington State University, Pullman, Washington 99164-4231, USA.
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Comprehensive analysis of the mouse renal cortex using two-dimensional HPLC - tandem mass spectrometry. Proteome Sci 2008; 6:15. [PMID: 18501002 PMCID: PMC2412861 DOI: 10.1186/1477-5956-6-15] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2008] [Accepted: 05/23/2008] [Indexed: 01/28/2023] Open
Abstract
Background Proteomic methodologies increasingly have been applied to the kidney to map the renal cortical proteome and to identify global changes in renal proteins induced by diseases such as diabetes. While progress has been made in establishing a renal cortical proteome using 1-D or 2-DE and mass spectrometry, the number of proteins definitively identified by mass spectrometry has remained surprisingly small. Low coverage of the renal cortical proteome as well as our interest in diabetes-induced changes in proteins found in the renal cortex prompted us to perform an in-depth proteomic analysis of mouse renal cortical tissue. Results We report a large scale analysis of mouse renal cortical proteome using SCX prefractionation strategy combined with HPLC – tandem mass spectrometry. High-confidence identification of ~2,000 proteins, including cytoplasmic, nuclear, plasma membrane, extracellular and unknown/unclassified proteins, was obtained by separating tryptic peptides of renal cortical proteins into 60 fractions by SCX prior to LC-MS/MS. The identified proteins represented the renal cortical proteome with no discernible bias due to protein physicochemical properties, subcellular distribution, biological processes, or molecular function. The highest ranked molecular functions were characteristic of tubular epithelium, and included binding, catalytic activity, transporter activity, structural molecule activity, and carrier activity. Comparison of this renal cortical proteome with published human urinary proteomes demonstrated enrichment of renal extracellular, plasma membrane, and lysosomal proteins in the urine, with a lack of intracellular proteins. Comparison of the most abundant proteins based on normalized spectral abundance factor (NSAF) in this dataset versus a published glomerular proteome indicated enrichment of mitochondrial proteins in the former and cytoskeletal proteins in the latter. Conclusion A whole tissue extract of the mouse kidney cortex was analyzed by an unbiased proteomic approach, yielding a dataset of ~2,000 unique proteins identified with strict criteria to ensure a high level of confidence in protein identification. As a result of extracting all proteins from the renal cortex, we identified an exceptionally wide range of renal proteins in terms of pI, MW, hydrophobicity, abundance, and subcellular location. Many of these proteins, such as low-abundance proteins, membrane proteins and proteins with extreme values in pI or MW are traditionally under-represented in 2-DE-based proteomic analysis.
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Gong TWL, Karolyi IJ, MacDonald J, Beyer L, Raphael Y, Kohrman DC, Camper SA, Lomax MI. Age-related changes in cochlear gene expression in normal and shaker 2 mice. J Assoc Res Otolaryngol 2006; 7:317-28. [PMID: 16794912 PMCID: PMC2504614 DOI: 10.1007/s10162-006-0046-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2005] [Accepted: 05/19/2006] [Indexed: 01/03/2023] Open
Abstract
The vertebrate cochlea is a complex organ optimized for sound transduction. Auditory hair cells, with their precisely arranged stereocilia bundles, transduce sound waves to electrical signals that are transmitted to the brain. Mutations in the unconventional myosin XV cause deafness in both human DFNB3 families and in shaker 2 (sh2) mice as a result of defects in stereocilia. In these mutant mice, hair cells have relatively normal spatial organization of stereocilia bundles but lack the graded, stair-step organization. We used sh2 mice as an experimental model to investigate the molecular consequences of the sh2 mutation in the Myo15 gene. Gene expression profiling with Affymetrix GeneChips in deaf homozygous (sh2/sh2) mice at 3 weeks and 3 months of age, and in age-matched, normal-hearing heterozygotes (+/sh2) identified only a few genes whose expression was affected by genotype, but a large number with age-associated changes in expression in both normal mice and sh2/sh2 homozygotes. Microarray data analyzed using Robust Multiarray Average identified Aim1, Dbi, and Tm4sf3 as genes with increased expression in sh2/sh2 homozygotes. These increases were confirmed by quantitative reverse transcription-polymerase chain reaction. Genes exhibiting altered expression with age encoded collagens and proteins involved in collagen maturation, extracellular matrix, and bone mineralization. These results identified potential cellular pathways associated with myosin XV defects, and age-associated molecular events that are likely to be involved in maturation of the cochlea and auditory function.
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Affiliation(s)
- Tzy-Wen L. Gong
- Kresge Hearing Research Institute, Department of Otolaryngology/Head–Neck Surgery, University of Michigan Medical School, Ann Arbor, MI 48109-0648 USA
| | - I. Jill Karolyi
- Department of Human Genetics, University of Michigan Medical School, Ann Arbor, MI 48109 USA
| | - James MacDonald
- University of Michigan Cancer Center, University of Michigan Medical School, Ann Arbor, MI 48109 USA
| | - Lisa Beyer
- Kresge Hearing Research Institute, Department of Otolaryngology/Head–Neck Surgery, University of Michigan Medical School, Ann Arbor, MI 48109-0648 USA
| | - Yehoash Raphael
- Kresge Hearing Research Institute, Department of Otolaryngology/Head–Neck Surgery, University of Michigan Medical School, Ann Arbor, MI 48109-0648 USA
| | - David C. Kohrman
- Kresge Hearing Research Institute, Department of Otolaryngology/Head–Neck Surgery, University of Michigan Medical School, Ann Arbor, MI 48109-0648 USA
- Department of Human Genetics, University of Michigan Medical School, Ann Arbor, MI 48109 USA
| | - Sally A. Camper
- Department of Human Genetics, University of Michigan Medical School, Ann Arbor, MI 48109 USA
| | - Margaret I. Lomax
- Kresge Hearing Research Institute, Department of Otolaryngology/Head–Neck Surgery, University of Michigan Medical School, Ann Arbor, MI 48109-0648 USA
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Holland SJ, Powell MJ, Franci C, Chan EW, Friera AM, Atchison RE, McLaughlin J, Swift SE, Pali ES, Yam G, Wong S, Lasaga J, Shen MR, Yu S, Xu W, Hitoshi Y, Bogenberger J, Nör JE, Payan DG, Lorens JB. Multiple roles for the receptor tyrosine kinase axl in tumor formation. Cancer Res 2005; 65:9294-303. [PMID: 16230391 DOI: 10.1158/0008-5472.can-05-0993] [Citation(s) in RCA: 147] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A focus of contemporary cancer therapeutic development is the targeting of both the transformed cell and the supporting cellular microenvironment. Cell migration is a fundamental cellular behavior required for the complex interplay between multiple cell types necessary for tumor development. We therefore developed a novel retroviral-based screening technology in primary human endothelial cells to discover genes that control cell migration. We identified the receptor tyrosine kinase Axl as a novel regulator of endothelial cell haptotactic migration towards the matrix factor vitronectin. Using small interfering RNA-mediated silencing and overexpression of wild-type or mutated receptor proteins, we show that Axl is a key regulator of multiple angiogenic behaviors including endothelial cell migration, proliferation, and tube formation in vitro. Moreover, using sustained, retrovirally delivered short hairpin RNA (shRNA) Axl knockdown, we show that Axl is necessary for in vivo angiogenesis in a mouse model. Furthermore, we show that Axl is also required for human breast carcinoma cells to form a tumor in vivo. These findings indicate that Axl regulates processes vital for both neovascularization and tumorigenesis. Disruption of Axl signaling using a small-molecule inhibitor will hence simultaneously affect both the tumor and stromal cell compartments and thus represents a unique approach for cancer therapeutic development.
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MESH Headings
- Animals
- Breast Neoplasms/blood supply
- Breast Neoplasms/enzymology
- Cell Growth Processes/physiology
- Cell Line, Tumor
- Cell Movement/genetics
- Cell Transformation, Neoplastic/metabolism
- Cells, Cultured
- Chemotaxis/drug effects
- Chemotaxis/physiology
- Coculture Techniques
- Endothelial Cells/cytology
- Endothelial Cells/enzymology
- Humans
- Mice
- Mice, SCID
- Neovascularization, Pathologic/enzymology
- Neovascularization, Pathologic/genetics
- Neovascularization, Physiologic/genetics
- Neovascularization, Physiologic/physiology
- Oncogene Proteins/antagonists & inhibitors
- Oncogene Proteins/biosynthesis
- Oncogene Proteins/genetics
- Oncogene Proteins/physiology
- Proto-Oncogene Proteins
- RNA, Small Interfering/genetics
- Receptor Protein-Tyrosine Kinases/antagonists & inhibitors
- Receptor Protein-Tyrosine Kinases/biosynthesis
- Receptor Protein-Tyrosine Kinases/genetics
- Receptor Protein-Tyrosine Kinases/physiology
- Signal Transduction
- Transfection
- Transplantation, Heterologous
- Vitronectin/pharmacology
- Axl Receptor Tyrosine Kinase
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Affiliation(s)
- Sacha J Holland
- Rigel, Inc., South San Francisco, California and University of Michigan School of Dentistry, Ann Arbor, MI, USA.
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22
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Abstract
The brain is enriched with sphingolipids, which are important membrane constituents and major lipid signaling molecules that have a role in motor and cognitive behavior. Vitamin K has been implicated in brain sphingolipid metabolism for more than 30 years. The in vitro and in vivo studies to date suggest a role of vitamin K in the regulation of multiple enzymes involved in sphingolipid metabolism within the myelin-rich regions in the brain. However, the precise mechanisms of action are not well understood. Further, the physiological consequences of the observed effects of vitamin K on sphingolipid metabolism have not been systematically studied.
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Affiliation(s)
- Natalia A Denisova
- Nutrition and Neurocognition Laboratory, Jean Mayer US Department of Agriculture Human Nutrition Research Center on Aging at Tufts University, Boston, Massachusetts 02111, USA.
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