1
|
Hartner A, Dambietz T, Cordasic N, Willam C, Burzlaff N, Brötsch M, Daniel C, Schiffer M, Amann K, Veelken R, Schley G, Hilgers KF. No benefit of HIF prolyl hydroxylase inhibition for hypertensive renal damage in renovascular hypertensive rats. Front Physiol 2023; 14:1208105. [PMID: 37435301 PMCID: PMC10331609 DOI: 10.3389/fphys.2023.1208105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Accepted: 06/15/2023] [Indexed: 07/13/2023] Open
Abstract
Introduction: We previously reported that malignant hypertension is associated with impaired capillary density of target organs. Here, we tested the hypothesis that stabilization of hypoxia-inducible factor (HIF) in a modified "preconditioning" approach prevents the development of malignant hypertension. To stabilize HIF, we employed pharmacological inhibition of HIF prolyl hydroxylases (PHD), that profoundly affect HIF metabolism. Methods: Two-kidney, one-clip renovascular hypertension (2K1C) was induced in rats; controls were sham operated. 2K1C rats received either intermittent injections of the PHD inhibitor ICA (2-(1-chloro-4-hydroxyisoquinoline-3-carboxamido) acetate) or placebo. Thirty-five days after clipping, the frequency of malignant hypertension was assessed (based on weight loss and the occurrence of characteristic vascular lesions). In addition, kidney injury was compared between all ICA treated versus all placebo treated 2K1C, regardless of the occurrence of malignant hypertension. HIF stabilization was evaluated by immunohistochemistry, and HIF target gene expression by RT-PCR. Results: Blood pressure was elevated to the same degree in ICA- and placebo-treated 2K1C compared to control rats. ICA treatment did not affect the frequency of malignant hypertension or the extent of kidney tissue fibrosis, inflammation, or capillary density. There was a trend towards higher mortality and worse kidney function in ICA-treated 2K1C rats. ICA increased the number of HIF-1α-positive renal tubular cell nuclei and induced several HIF-1 target genes. In contrast, expression of HIF-2α protein as well as HIF-2 target genes were markedly enhanced by 2K1C hypertension, irrespective of ICA treatment. Discussion: We conclude that intermittent PHD inhibition did not ameliorate severe renovascular hypertension in rats. We speculate that the unexpected strong renal accumulation of HIF-2α in renovascular hypertension, which could not be further augmented by ICA, may contribute to the lack of a benefit from PHD inhibition.
Collapse
Affiliation(s)
- Andrea Hartner
- Department of Pediatrics and Adolescent Medicine, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Thomas Dambietz
- Department of Nephrology and Hypertension, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Nada Cordasic
- Department of Nephrology and Hypertension, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Carsten Willam
- Department of Nephrology and Hypertension, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Nicolai Burzlaff
- Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Martin Brötsch
- Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Christoph Daniel
- Department of Nephropathology, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Mario Schiffer
- Department of Nephrology and Hypertension, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Kerstin Amann
- Department of Nephropathology, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Roland Veelken
- Department of Nephrology and Hypertension, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Gunnar Schley
- Department of Nephrology and Hypertension, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Karl F. Hilgers
- Department of Nephrology and Hypertension, University of Erlangen-Nürnberg, Erlangen, Germany
| |
Collapse
|
2
|
Afsar B, Afsar RE. Hypoxia-inducible factors and essential hypertension: narrative review of experimental and clinical data. Pharmacol Rep 2023:10.1007/s43440-023-00497-x. [PMID: 37210694 DOI: 10.1007/s43440-023-00497-x] [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: 03/06/2023] [Revised: 05/11/2023] [Accepted: 05/12/2023] [Indexed: 05/22/2023]
Abstract
Hypoxia-inducible factor (HIFs) is a new class of drug developed for the management of anemia in chronic kidney disease (CKD) patients. HIFs increase the production of erythropoietin in the kidney and liver, enhance the absorption and utilization of iron, and stimulate the maturation and proliferation of erythroid progenitor cells. Besides, HIFs regulate many physiologic processes by orchestrating the transcription of hundreds of genes. Essential hypertension (HT) is an epidemic worldwide. HIFs play a role in many biological processes involved in the regulation of blood pressure (BP). In the current review, we summarize pre-clinical and clinical studies investigating the relationship between HIFs and BP regulation in patients with CKD, conflicting issues, and discuss future potential strategies.
Collapse
Affiliation(s)
- Baris Afsar
- Department of Nephrology, School of Medicine, Suleyman Demirel University, Isparta, Turkey.
| | - Rengin Elsurer Afsar
- Department of Nephrology, School of Medicine, Suleyman Demirel University, Isparta, Turkey
| |
Collapse
|
3
|
Devaux CA, Raoult D. The impact of COVID-19 on populations living at high altitude: Role of hypoxia-inducible factors (HIFs) signaling pathway in SARS-CoV-2 infection and replication. Front Physiol 2022; 13:960308. [PMID: 36091390 PMCID: PMC9454615 DOI: 10.3389/fphys.2022.960308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Accepted: 08/02/2022] [Indexed: 11/13/2022] Open
Abstract
Cases of coronavirus disease 2019 (COVID-19) have been reported worldwide. However, one epidemiological report has claimed a lower incidence of the disease in people living at high altitude (>2,500 m), proposing the hypothesis that adaptation to hypoxia may prove to be advantageous with respect to SARS-CoV-2 infection. This publication was initially greeted with skepticism, because social, genetic, or environmental parametric variables could underlie a difference in susceptibility to the virus for people living in chronic hypobaric hypoxia atmospheres. Moreover, in some patients positive for SARS-CoV-2, early post-infection ‘happy hypoxia” requires immediate ventilation, since it is associated with poor clinical outcome. If, however, we accept to consider the hypothesis according to which the adaptation to hypoxia may prove to be advantageous with respect to SARS-CoV-2 infection, identification of the molecular rational behind it is needed. Among several possibilities, HIF-1 regulation appears to be a molecular hub from which different signaling pathways linking hypoxia and COVID-19 are controlled. Interestingly, HIF-1α was reported to inhibit the infection of lung cells by SARS-CoV-2 by reducing ACE2 viral receptor expression. Moreover, an association of the rs11549465 variant of HIF-1α with COVID-19 susceptibility was recently discovered. Here, we review the evidence for a link between HIF-1α, ACE2 and AT1R expression, and the incidence/severity of COVID-19. We highlight the central role played by the HIF-1α signaling pathway in the pathophysiology of COVID-19.
Collapse
Affiliation(s)
- Christian Albert Devaux
- Aix-Marseille University, IRD, APHM, MEPHI, Marseille, France
- IHU-Méditerranée Infection, Marseille, France
- Centre National de la Recherche Scientifique, Marseille, France
- *Correspondence: Christian Albert Devaux,
| | - Didier Raoult
- Aix-Marseille University, IRD, APHM, MEPHI, Marseille, France
- IHU-Méditerranée Infection, Marseille, France
| |
Collapse
|
4
|
Advancements in nanomedicines for the detection and treatment of diabetic kidney disease. BIOMATERIALS AND BIOSYSTEMS 2022; 6:100047. [PMID: 36824160 PMCID: PMC9934479 DOI: 10.1016/j.bbiosy.2022.100047] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 03/22/2022] [Accepted: 03/27/2022] [Indexed: 12/18/2022] Open
Abstract
In the diabetic kidneys, morbidities such as accelerated ageing, hypertension and hyperglycaemia create a pro-inflammatory microenvironment characterised by extensive fibrogenesis. Radiological techniques are not yet optimised generating inconsistent and non-reproducible data. The gold standard procedure to assess renal fibrosis is kidney biopsy, followed by histopathological assessment. However, this method is risky, invasive, subjective and examines less than 0.01% of kidney tissue resulting in diagnostic errors. As such, less than 10% of patients undergo kidney biopsy, limiting the accuracy of the current diabetic kidney disease (DKD) staging method. Standard treatments suppress the renin-angiotensin system to control hypertension and use of pharmaceuticals aimed at controlling diabetes have shown promise but can cause hypoglycaemia, diuresis and malnutrition as a result of low caloric intake. New approaches to both diagnosis and treatment are required. Nanoparticles (NPs) are an attractive candidate for managing DKD due to their ability to act as theranostic tools that can carry drugs and enhance image contrast. NP-based point-of-care systems can provide physiological information previously considered unattainable and provide control over the rate and location of drug release. Here we discuss the use of nanotechnology in renal disease, its application to both the treatment and diagnosis of DKD. Finally, we propose a new method of NP-based DKD classification that overcomes the current systems limitations.
Collapse
|
5
|
Zhao Y, Zeng H, Liu B, He X, Chen JX. Endothelial prolyl hydroxylase 2 is necessary for angiotensin II-mediated renal fibrosis and injury. Am J Physiol Renal Physiol 2020; 319:F345-F357. [PMID: 32715763 DOI: 10.1152/ajprenal.00032.2020] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Angiotensin II (ANG II) is the key contributor to renal fibrosis and injury. The present study investigated the role of endothelium prolyl hydroxylase 2 (PHD2) in ANG II-mediated renal fibrosis and injury. In vitro, endothelial cells (ECs) were isolated from PHD2f/f control [wild-type (WT)] mice or PHD2 EC knockout (PHD2ECKO) mice. In vivo, WT and PHD2ECKO mice were infused with ANG II (1,000 ng·kg-1·min-1) for 28 days. Renal fibrosis, reactive oxygen species (ROS), and iron contents were measured. Knockout of PHD2 resulted in a significant increase in the expression of hypoxia-inducible factor (HIF)-1α and HIF-2α in ECs. Intriguingly, knockout of PHD2 significantly reduced expression of the ANG II type 1 receptor (AT1R) in ECs. WT mice infused with ANG II caused increases in renal fibrosis, ROS formation, and iron contents. ANG II treatment led to a downregulation of PHD1 expression and upregulation of HIF-1α and HIF-2α in the renal cortex and medulla. Knockout of PHD2 in EC blunted ANG II-induced downregulation of PHD1 expression. Furthermore, knockout of PHD2 in ECs attenuated ANG II-induced expression of HIF-1α, HIF-2α, transforming growth factor-β1, p47phox, gp91phox, heme oxygenase-1, and ferroportin. This was accompanied by a significant suppression of renal fibrosis, ROS formation, and iron accumulation. In summary, knockout of endothelial PHD2 suppressed the expression of AT1R in ECs and blunted ANG II-induced downregulation of PHD1 and upregulation of HIF-α in the kidney. Our study, for the first time, demonstrates a necessary role of endothelial PHD2 in ANG II-mediated renal fibrosis and injury.
Collapse
Affiliation(s)
- Yongzhen Zhao
- Department of Pharmacology and Toxicology, School of Medicine, University of Mississippi Medical Center, Jackson, Mississippi
| | - Heng Zeng
- Department of Pharmacology and Toxicology, School of Medicine, University of Mississippi Medical Center, Jackson, Mississippi
| | - Bo Liu
- Department of Pharmacology and Toxicology, School of Medicine, University of Mississippi Medical Center, Jackson, Mississippi
| | - Xiaochen He
- Department of Pharmacology and Toxicology, School of Medicine, University of Mississippi Medical Center, Jackson, Mississippi
| | - Jian-Xiong Chen
- Department of Pharmacology and Toxicology, School of Medicine, University of Mississippi Medical Center, Jackson, Mississippi
| |
Collapse
|
6
|
Paneerselvam C, Ganapasam S. β-Escin alleviates cobalt chloride-induced hypoxia-mediated apoptotic resistance and invasion via ROS-dependent HIF-1α/TGF-β/MMPs in A549 cells. Toxicol Res (Camb) 2020; 9:191-201. [PMID: 32670550 PMCID: PMC7329168 DOI: 10.1093/toxres/tfaa019] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 02/17/2020] [Accepted: 03/20/2020] [Indexed: 11/12/2022] Open
Abstract
Hypoxia is contributed in various pathophysiological conditions including obesity, cardiovascular diseases, and cancer. In cancer, hypoxia is a salient phenomenon and has been correlated with tumor progression, metastasis, and provoke resistance to therapies in cancer patients, which exert with stabilization of main effector, hypoxia inducible factor-1 alpha (HIF-1α). Therefore, therapeutic targeting of hypoxic responses in cancer is the potential approach to improve the better treatment efficacy. In the present study, we evaluated the effect of β-Escin (β-Es) on hypoxia-induced resistance to apoptosis and metastasis in human non-small-cell lung cancer cells. The MTT assay revealed that β-Es treatment decreased the A549 cells viability under cobalt chloride-induced hypoxia. Apoptotic proteins were analyzed by western blot that showed cancer cells treated with β-Es induced cell death in hypoxia condition as proteins compared with normoxia. Moreover, we observed that cobalt chloride induced hypoxia through the generation of intracellular reactive oxygen species and stabilized the transcriptional factor HIF-1α, which leads to cancer metastasis. This notion was supported by the migration, invasion, and adhesion assays. Furthermore, hypoxia increased the expression of transforming growth factor-β, and the activation of matrix metalloproteinases were suppressed by the treatment of β-Es as well as pretreatment with N-acetylcysteine (NAC). Therefore, we demonstrate that a concurrent activation of HIF-1α, transforming growth factor-β, and matrix metalloproteinases participate in hypoxia-induced metastasis and that β-Es prevent A549 cells metastasis by inhibition of reactive oxygen species.
Collapse
Affiliation(s)
- Chermakani Paneerselvam
- Cell Biology Laboratory, Department of Biochemistry, University of Madras, Guindy Campus, Chennai-600 025, Tamil Nadu, India
| | - Sudhandiran Ganapasam
- Cell Biology Laboratory, Department of Biochemistry, University of Madras, Guindy Campus, Chennai-600 025, Tamil Nadu, India
| |
Collapse
|
7
|
Forrester SJ, Booz GW, Sigmund CD, Coffman TM, Kawai T, Rizzo V, Scalia R, Eguchi S. Angiotensin II Signal Transduction: An Update on Mechanisms of Physiology and Pathophysiology. Physiol Rev 2018; 98:1627-1738. [PMID: 29873596 DOI: 10.1152/physrev.00038.2017] [Citation(s) in RCA: 614] [Impact Index Per Article: 102.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The renin-angiotensin-aldosterone system plays crucial roles in cardiovascular physiology and pathophysiology. However, many of the signaling mechanisms have been unclear. The angiotensin II (ANG II) type 1 receptor (AT1R) is believed to mediate most functions of ANG II in the system. AT1R utilizes various signal transduction cascades causing hypertension, cardiovascular remodeling, and end organ damage. Moreover, functional cross-talk between AT1R signaling pathways and other signaling pathways have been recognized. Accumulating evidence reveals the complexity of ANG II signal transduction in pathophysiology of the vasculature, heart, kidney, and brain, as well as several pathophysiological features, including inflammation, metabolic dysfunction, and aging. In this review, we provide a comprehensive update of the ANG II receptor signaling events and their functional significances for potential translation into therapeutic strategies. AT1R remains central to the system in mediating physiological and pathophysiological functions of ANG II, and participation of specific signaling pathways becomes much clearer. There are still certain limitations and many controversies, and several noteworthy new concepts require further support. However, it is expected that rigorous translational research of the ANG II signaling pathways including those in large animals and humans will contribute to establishing effective new therapies against various diseases.
Collapse
Affiliation(s)
- Steven J Forrester
- Cardiovascular Research Center, Lewis Katz School of Medicine at Temple University , Philadelphia, Pennsylvania ; Department of Pharmacology and Toxicology, School of Medicine, University of Mississippi Medical Center , Jackson, Mississippi ; Department of Pharmacology, Center for Hypertension Research, Roy J. and Lucille A. Carver College of Medicine, University of Iowa , Iowa City, Iowa ; and Duke-NUS, Singapore and Department of Medicine, Duke University Medical Center , Durham, North Carolina
| | - George W Booz
- Cardiovascular Research Center, Lewis Katz School of Medicine at Temple University , Philadelphia, Pennsylvania ; Department of Pharmacology and Toxicology, School of Medicine, University of Mississippi Medical Center , Jackson, Mississippi ; Department of Pharmacology, Center for Hypertension Research, Roy J. and Lucille A. Carver College of Medicine, University of Iowa , Iowa City, Iowa ; and Duke-NUS, Singapore and Department of Medicine, Duke University Medical Center , Durham, North Carolina
| | - Curt D Sigmund
- Cardiovascular Research Center, Lewis Katz School of Medicine at Temple University , Philadelphia, Pennsylvania ; Department of Pharmacology and Toxicology, School of Medicine, University of Mississippi Medical Center , Jackson, Mississippi ; Department of Pharmacology, Center for Hypertension Research, Roy J. and Lucille A. Carver College of Medicine, University of Iowa , Iowa City, Iowa ; and Duke-NUS, Singapore and Department of Medicine, Duke University Medical Center , Durham, North Carolina
| | - Thomas M Coffman
- Cardiovascular Research Center, Lewis Katz School of Medicine at Temple University , Philadelphia, Pennsylvania ; Department of Pharmacology and Toxicology, School of Medicine, University of Mississippi Medical Center , Jackson, Mississippi ; Department of Pharmacology, Center for Hypertension Research, Roy J. and Lucille A. Carver College of Medicine, University of Iowa , Iowa City, Iowa ; and Duke-NUS, Singapore and Department of Medicine, Duke University Medical Center , Durham, North Carolina
| | - Tatsuo Kawai
- Cardiovascular Research Center, Lewis Katz School of Medicine at Temple University , Philadelphia, Pennsylvania ; Department of Pharmacology and Toxicology, School of Medicine, University of Mississippi Medical Center , Jackson, Mississippi ; Department of Pharmacology, Center for Hypertension Research, Roy J. and Lucille A. Carver College of Medicine, University of Iowa , Iowa City, Iowa ; and Duke-NUS, Singapore and Department of Medicine, Duke University Medical Center , Durham, North Carolina
| | - Victor Rizzo
- Cardiovascular Research Center, Lewis Katz School of Medicine at Temple University , Philadelphia, Pennsylvania ; Department of Pharmacology and Toxicology, School of Medicine, University of Mississippi Medical Center , Jackson, Mississippi ; Department of Pharmacology, Center for Hypertension Research, Roy J. and Lucille A. Carver College of Medicine, University of Iowa , Iowa City, Iowa ; and Duke-NUS, Singapore and Department of Medicine, Duke University Medical Center , Durham, North Carolina
| | - Rosario Scalia
- Cardiovascular Research Center, Lewis Katz School of Medicine at Temple University , Philadelphia, Pennsylvania ; Department of Pharmacology and Toxicology, School of Medicine, University of Mississippi Medical Center , Jackson, Mississippi ; Department of Pharmacology, Center for Hypertension Research, Roy J. and Lucille A. Carver College of Medicine, University of Iowa , Iowa City, Iowa ; and Duke-NUS, Singapore and Department of Medicine, Duke University Medical Center , Durham, North Carolina
| | - Satoru Eguchi
- Cardiovascular Research Center, Lewis Katz School of Medicine at Temple University , Philadelphia, Pennsylvania ; Department of Pharmacology and Toxicology, School of Medicine, University of Mississippi Medical Center , Jackson, Mississippi ; Department of Pharmacology, Center for Hypertension Research, Roy J. and Lucille A. Carver College of Medicine, University of Iowa , Iowa City, Iowa ; and Duke-NUS, Singapore and Department of Medicine, Duke University Medical Center , Durham, North Carolina
| |
Collapse
|
8
|
Pharmacologic ascorbate (P-AscH -) suppresses hypoxia-inducible Factor-1α (HIF-1α) in pancreatic adenocarcinoma. Clin Exp Metastasis 2018; 35:37-51. [PMID: 29396728 DOI: 10.1007/s10585-018-9876-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Accepted: 01/31/2018] [Indexed: 12/24/2022]
Abstract
HIF-1α is a transcriptional regulator that functions in the adaptation of cells to hypoxic conditions; it strongly impacts the prognosis of patients with cancer. High-dose, intravenous, pharmacological ascorbate (P-AscH-), induces cytotoxicity and oxidative stress selectively in cancer cells by acting as a pro-drug for the delivery of hydrogen peroxide (H2O2); early clinical data suggest improved survival and inhibition of metastasis in patients being actively treated with P-AscH-. Previous studies have demonstrated that activation of HIF-1α is necessary for P-AscH- sensitivity. We hypothesized that pancreatic cancer (PDAC) progression and metastasis could be be targeted by P-AscH- via H2O2-mediated inhibition of HIF-1α stabilization. Our study demonstrates an oxygen- and prolyl hydroxylase-independent regulation of HIF-1α by P-AscH-. Additionally, P-AscH- decreased VEGF secretion in a dose-dependent manner that was reversible with catalase, consistent with an H2O2-mediated mechanism. Pharmacological and genetic manipulations of HIF-1α did not alter P-AscH--induced cytotoxicity. In vivo, P-AscH- inhibited tumor growth and VEGF expression. We conclude that P-AscH- suppresses the levels of HIF-1α protein in hypoxic conditions through a post-translational mechanism. These findings suggest potential new therapies specifically designed to inhibit the mechanisms that drive metastases as a part of PDAC treatment.
Collapse
|
9
|
AT1 receptor antagonism before ischemia prevents the transition of acute kidney injury to chronic kidney disease. Kidney Int 2017; 89:363-73. [PMID: 26509589 DOI: 10.1038/ki.2015.320] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Revised: 08/21/2015] [Accepted: 08/27/2015] [Indexed: 12/29/2022]
Abstract
Despite clinical recovery of patients from an episode of acute kidney injury (AKI), progression to chronic kidney disease (CKD) is possible on long-term follow-up. However, mechanisms of this are poorly understood. Here, we determine whether activation of angiotensin-II type 1 receptors during AKI triggers maladaptive mechanisms that lead to CKD. Nine months after AKI, male Wistar rats develop CKD characterized by renal dysfunction, proteinuria, renal hypertrophy, glomerulosclerosis, tubular atrophy, and tubulointerstitial fibrosis. Renal injury was associated with increased oxidative stress, inflammation, α-smooth muscle actin expression, and activation of transforming growth factor β; the latter mainly found in epithelial cells. Although administration of losartan prior to the initial ischemic insult did not prevent or reduce AKI severity, it effectively prevented eventual CKD. Three days after AKI, renal dysfunction, tubular structural injury, and elevation of urinary biomarkers were present. While the losartan group had similar early renal injury, renal perfusion was completely restored as early as day 3 postischemia. Further, there was increased vascular endothelial growth factor expression and an early activation of hypoxia-inducible factor 1 α, a transcription factor that regulates expression of many genes that help reduce renal injury. Thus, AT1 receptor antagonism prior to ischemia prevented AKI to CKD transition by improving early renal blood flow recovery, lesser inflammation, and increased hypoxia-inducible factor 1 α activity.
Collapse
|
10
|
Yang L, Shen L, Li G, Yuan H, Jin X, Wu X. Silencing of hypoxia inducible factor-1α gene attenuated angiotensin Ⅱ-induced abdominal aortic aneurysm in apolipoprotein E-deficient mice. Atherosclerosis 2016; 252:40-49. [PMID: 27497884 DOI: 10.1016/j.atherosclerosis.2016.07.010] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Revised: 07/02/2016] [Accepted: 07/07/2016] [Indexed: 02/05/2023]
Abstract
BACKGROUND AND AIMS We aimed to determine the effect of HIF-1α, the main regulatory subunit of the hypoxia inducible factor 1 (HIF-1), on the development of the abdominal aortic aneurysm (AAA). METHODS AAA was induced in ApoE(-/-) mice by angiotensinⅡ (AngⅡ) infusion. In vivo silencing of HIF-1α was achieved by transfection of lentivirus expressing HIF-1α shRNA. RESULTS Time course analysis of the AngⅡ infusion model revealed that HIF-1α was persistently upregulated during a 28-day period of AAA development. Silencing of the HIF-1α gene reduced the aneurysm size (2.84 ± 1.96 mm vs. 1.41 ± 0.85 mm respectively at day 28, p = 0.0002). Silencing of HIF-1α also alleviated infiltration of macrophages (38.8 ± 14.7 vs. 11.4 ± 4.4 macrophages/0.1 mm(2), p = 0.0006) and neovascularity (5.56 ± 2.14 vs. 1.27 ± 1.05 microvessels/0.1 mm(2), p = 0.0008) in the AngⅡ infusion model, at day 28. The activity of MMP-2 and MMP-9 was also decreased by knockdown of HIF-1α. The early increased expression of pro-inflammatory factors, angiogenic factors, and MMPs during AAA induction was alleviated by HIF-1α silencing. CONCLUSIONS Activation of HIF-1 signaling pathway participates in the Ang Ⅱ-induced AAA formation in mice.
Collapse
Affiliation(s)
- Le Yang
- Department of Vascular Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China
| | - Lin Shen
- Department of Ophthalmology, QiLu Hospital to Shandong University, Jinan, China
| | - Gang Li
- Department of Vascular Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China
| | - Hai Yuan
- Department of Vascular Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China
| | - Xing Jin
- Department of Vascular Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China.
| | - Xuejun Wu
- Department of Vascular Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China.
| |
Collapse
|
11
|
Cytotoxic activity of anticancer drugs on hepatocellular carcinoma cells in hypoxic-hyponutritional culture. Int Surg 2016; 99:745-52. [PMID: 25437582 DOI: 10.9738/intsurg-d-14-00073.1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
To investigate which anticancer drugs and combination of dual drugs could further promote the inhibition of cell growth in vitro against HCC cell line (HepG2) in the hypoxic and hyponutritional culture medium (HHCM) mimicked the different scenarios of transcatheter arterial chemoembolization (TACE). The cells of hepatocellular carcinoma (HCC) treated by TACE suffered various hypoxia and hyponutrition. The cells were treated for 2 hours, 4 hours, 6 hours, and 24 hours, respectively, using 10 drugs including epirubicin (EPI), cisplatin (DDP), mitomycin-C (MMC), oxaliplatin (OXA), hydroxycamptothecin (HCPT), 5-fluorouracil (5-FU), gemcitabine (GEM), docetaxel (DTX), thiotepa (TSPA), and pemetrexed disodium (PEM) in 4 concentrations of HHCM (5%, 10%, 25%, and 50%, respectively) mimicking the scenario of TACE and were assessed using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. The cells treated with combinations of dual drugs for 24 hours were also tested. The sensitive drugs with inhibition rates more than 30% were EPI, MMC, HCPT, OXA, and PEM in 4 types of HHCMs. The sensitivity of the cells to treatment with drugs for 24 hours was significantly higher than the sensitivity of the cells to treatment with drugs for 2 hours in 5%, 10%, and 25% HHCM. The sensitivity of the combination of dual drugs was no more than the sensitivity of the single drug with higher sensitivity in 4 concentrations of HHCM. EPI, MMC, HCPT, OXA, and PEM exhibited cytotoxic activity against HepG2 cells in various hypoxia and hyponutrition states. Prolonging the time of exposure could increase the sensitivity of drug, and the combination of dual drugs cannot enhance the cytotoxic effect.
Collapse
|
12
|
Silpanisong J, Pearce WJ. Vasotrophic regulation of age-dependent hypoxic cerebrovascular remodeling. Curr Vasc Pharmacol 2014; 11:544-63. [PMID: 24063376 DOI: 10.2174/1570161111311050002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2012] [Revised: 06/08/2012] [Accepted: 07/12/2012] [Indexed: 02/07/2023]
Abstract
Hypoxia can induce functional and structural vascular remodeling by changing the expression of trophic factors to promote homeostasis. While most experimental approaches have been focused on functional remodeling, structural remodeling can reflect changes in the abundance and organization of vascular proteins that determine functional remodeling. Better understanding of age-dependent hypoxic macrovascular remodeling processes of the cerebral vasculature and its clinical implications require knowledge of the vasotrophic factors that influence arterial structure and function. Hypoxia can affect the expression of transcription factors, classical receptor tyrosine kinase factors, non-classical G-protein coupled factors, catecholamines, and purines. Hypoxia's remodeling effects can be mediated by Hypoxia Inducible Factor (HIF) upregulation in most vascular beds, but alterations in the expression of growth factors can also be independent of HIF. PPARγ is another transcription factor involved in hypoxic remodeling. Expression of classical receptor tyrosine kinase ligands, including vascular endothelial growth factor, platelet derived growth factor, fibroblast growth factor and angiopoietins, can be altered by hypoxia which can act simultaneously to affect remodeling. Tyrosine kinase-independent factors, such as transforming growth factor, nitric oxide, endothelin, angiotensin II, catecholamines, and purines also participate in the remodeling process. This adaptation to hypoxic stress can fundamentally change with age, resulting in different responses between fetuses and adults. Overall, these mechanisms integrate to assure that blood flow and metabolic demand are closely matched in all vascular beds and emphasize the view that the vascular wall is a highly dynamic and heterogeneous tissue with multiple cell types undergoing regular phenotypic transformation.
Collapse
Affiliation(s)
- Jinjutha Silpanisong
- Center for Perinatal Biology, Loma Linda University School of Medicine, Loma Linda, CA 92350, USA.
| | | |
Collapse
|
13
|
Imanishi M, Tomita S, Ishizawa K, Kihira Y, Ueno M, Izawa-Ishizawa Y, Ikeda Y, Yamano N, Tsuchiya K, Tamaki T. Smooth muscle cell-specific Hif-1α deficiency suppresses angiotensin II-induced vascular remodelling in mice. Cardiovasc Res 2014; 102:460-8. [DOI: 10.1093/cvr/cvu061] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
|
14
|
Tada Y, Ogawa M, Watanabe R, Zempo H, Takamura C, Suzuki JI, Dan T, Miyata T, Isobe M, Komuro I. Neovascularization induced by hypoxia inducible transcription factor is associated with the improvement of cardiac dysfunction in experimental autoimmune myocarditis. Expert Opin Investig Drugs 2013; 23:149-62. [DOI: 10.1517/13543784.2014.855196] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
15
|
Inhibition of prolyl hydroxylase domain-containing protein on hypertension/renal injury induced by high salt diet and nitric oxide withdrawal. J Hypertens 2013; 31:2043-9. [DOI: 10.1097/hjh.0b013e32836356a0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
16
|
Dallatu MK, Nwokocha E, Agu N, Myung C, Newaz MA, Garcia G, Truong LD, Oyekan AO. The Role of Hypoxia-Inducible Factor/Prolyl Hydroxylation Pathway in Deoxycorticosterone Acetate/Salt Hypertension in the Rat. ACTA ACUST UNITED AC 2013; 3. [PMID: 26185735 DOI: 10.4172/2167-1095.1000184] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
KKidney disease could result from hypertension and ischemia/hypoxia. Key mediators of cellular adaptation to hypoxia are oxygen-sensitive hypoxia inducible factor (HIF)s which are regulated by prolyl-4-hydroxylase domain (PHD)-containing dioxygenases. However, HIF activation can be protective as in ischemic death or promote renal fibrosis in chronic conditions. This study tested the hypothesis that increased HIF-1α consequent to reduced PHD expression contributes to the attendant hypertension and target organ damage in deoxycorticosterone acetate (DOCA)/salt hypertension and that PHD inhibition ameliorates this effect. In rats made hypertensive by DOCA/salt treatment (DOCA 50 mg/kg s/c; 1% NaCl orally), PHD inhibition with dimethyl oxallyl glycine (DMOG) markedly attenuated hypertension (P<0.05), proteinuria (P<0.05) and attendant tubular interstitial changes and glomerular damage (P<0.05). Accompanying these changes, DMOG blunted the increased expression of kidney injury molecule (KIM)-1 (P<0.05), a marker of tubular injury and reversed the decreased expression of nephrin (P<0.05), a marker of glomerular injury. DMOG also decreased collagen I staining (P<0.05), increased serum nitrite (P<0.05) and decreased serum 8-isopostane (P<0.05). However, the increased HIF-1α expression (P<0.01) and decreased PHD2 expression (P<0.05) in DOCA/salt hypertensive rats was not affected by DMOG. These data suggest that reduced PHD2 expression with consequent increase in HIF-1α expression probably results from hypoxia induced by DOCA/salt treatment with the continued hypoxia and reduced PHD2 expression evoking hypertensive renal injury and collagen deposition at later stages. Moreover, a PHD inhibitor exerted a protective effect in DOCA/salt hypertension by mechanisms involving increased nitric oxide production and reduced production of reactive oxygen species.
Collapse
Affiliation(s)
| | | | - Ngozi Agu
- Center for Cardiovascular Diseases, Texas Southern University, USA
| | - Choi Myung
- Center for Cardiovascular Diseases, Texas Southern University, USA
| | | | - Gabriela Garcia
- Department of Medicine, Division of Renal Diseases and Hypertension, University of Colorado, USA
| | - Luan D Truong
- Department of Pathology and Genomic Medicine, The Methodist Hospital, Houston, USA
| | - Adebayo O Oyekan
- Center for Cardiovascular Diseases, Texas Southern University, USA
| |
Collapse
|
17
|
Hypoxia Inducible Factor-1: Its Potential Role In Cerebral Ischemia. Cell Mol Neurobiol 2012; 32:491-507. [DOI: 10.1007/s10571-012-9803-9] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2011] [Accepted: 01/13/2012] [Indexed: 12/16/2022]
|
18
|
Takayanagi T, Eguchi S. Inhibition of prolyl hydroxylase domain-containing protein: a novel therapy for cardiovascular diseases? Hypertension 2011; 58:354-5. [PMID: 21825225 DOI: 10.1161/hypertensionaha.111.177949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|