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Shimizu S, Fukuda N, Chen L, Matsumoto T, Kaneda A, Endo M, Nishiyama A, Morioka I. Abnormal epigenetic memory of mesenchymal stem and progenitor cells caused by fetal malnutrition induces hypertension and renal injury in adulthood. Hypertens Res 2024; 47:2405-2415. [PMID: 38926588 DOI: 10.1038/s41440-024-01756-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2024] [Revised: 05/19/2024] [Accepted: 05/28/2024] [Indexed: 06/28/2024]
Abstract
Fetal malnutrition has been reported to induce hypertension and renal injury in adulthood. We hypothesized that this hypertension and renal injury would be associated with abnormal epigenetic memory of stem and progenitor cells contributing to organization in offspring due to fetal malnutrition. We measured blood pressure (BP) for 60 weeks in offspring of pregnant rats fed a normal protein diet (Control), low-protein diet (LP), and LP plus taurine (LPT) in the fetal period. We used western blot analysis to evaluate the expression of αSMA and renin in CD44-positive renal mesenchymal stem cells (MSCs) during differentiation by TGF-β1. We measured kidney label-retaining cells (LRCs) at 11 weeks of age and formation of endothelial progenitor cells (EPCs) at 60 weeks of age from the offspring with fetal malnutrition. Epigenetics of the renal MSCs at 14 weeks were investigated by ATAC-sequence and RNA-sequence analyses. BP was significantly higher in LP than that in Control and LPT after 45-60 weeks of age. Numbers of LRCs and EPC colonies were significantly lower in LP than in Control. Renal MSCs from LP already showed expression of h-caldesmon, αSMA, LXRα, and renin before their differentiation. Epigenetic analyses identified PAR2, Chac1, and Tspan6 genes in the abnormal differentiation of renal MSCs. These findings suggested that epigenetic abnormalities of stem and progenitor cell memory cause hypertension and renal injury that appear in adulthood of offspring with fetal malnutrition.
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Affiliation(s)
- Shoichi Shimizu
- Department of Pediatrics and Child Health, Nihon University School of Medicine, Tokyo, Japan
| | - Noboru Fukuda
- Division of Cell Regeneration and Transplantation, Department of Functional Morphology, Nihon University School of Medicine, Tokyo, Japan.
| | - Lan Chen
- Division of Cell Regeneration and Transplantation, Department of Functional Morphology, Nihon University School of Medicine, Tokyo, Japan
| | - Taro Matsumoto
- Division of Cell Regeneration and Transplantation, Department of Functional Morphology, Nihon University School of Medicine, Tokyo, Japan
| | - Atsushi Kaneda
- Department of Molecular Oncology, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - Morito Endo
- Faculty of Human Health Science, Hachinohe Gakuin University, Hachinohe, Aomori, Japan
| | - Akira Nishiyama
- Department of Pharmacology, Kagawa University School of Medicine, Takamatsu, Kagawa, Japan
| | - Ichiro Morioka
- Department of Pediatrics and Child Health, Nihon University School of Medicine, Tokyo, Japan
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Kim H, Park C, Kim TH. Targeting Liver X Receptors for the Treatment of Non-Alcoholic Fatty Liver Disease. Cells 2023; 12:cells12091292. [PMID: 37174692 PMCID: PMC10177243 DOI: 10.3390/cells12091292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2023] [Revised: 04/29/2023] [Accepted: 04/29/2023] [Indexed: 05/15/2023] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) refers to a range of conditions in which excess lipids accumulate in the liver, possibly leading to serious hepatic manifestations such as steatohepatitis, fibrosis/cirrhosis and cancer. Despite its increasing prevalence and significant impact on liver disease-associated mortality worldwide, no medication has been approved for the treatment of NAFLD yet. Liver X receptors α/β (LXRα and LXRβ) are lipid-activated nuclear receptors that serve as master regulators of lipid homeostasis and play pivotal roles in controlling various metabolic processes, including lipid metabolism, inflammation and immune response. Of note, NAFLD progression is characterized by increased accumulation of triglycerides and cholesterol, hepatic de novo lipogenesis, mitochondrial dysfunction and augmented inflammation, all of which are highly attributed to dysregulated LXR signaling. Thus, targeting LXRs may provide promising strategies for the treatment of NAFLD. However, emerging evidence has revealed that modulating the activity of LXRs has various metabolic consequences, as the main functions of LXRs can distinctively vary in a cell type-dependent manner. Therefore, understanding how LXRs in the liver integrate various signaling pathways and regulate metabolic homeostasis from a cellular perspective using recent advances in research may provide new insights into therapeutic strategies for NAFLD and associated metabolic diseases.
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Affiliation(s)
- Hyejin Kim
- College of Pharmacy, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Chaewon Park
- College of Pharmacy, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Tae Hyun Kim
- College of Pharmacy, Sookmyung Women's University, Seoul 04310, Republic of Korea
- Drug Information Research Institute, Sookmyung Women's University, Seoul 04310, Republic of Korea
- Muscle Physiome Research Center, Sookmyung Women's University, Seoul 04310, Republic of Korea
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Huang Q, Su J, Xu J, Yu H, Jin X, Wang Y, Yan M, Yu J, Chen S, Wang Y, Lv G. Beneficial effects of Panax notoginseng (Burkill) F. H. Chen flower saponins in rats with metabolic hypertension by inhibiting the activation of the renin-angiotensin-aldosterone system through complement 3. BMC Complement Med Ther 2023; 23:13. [PMID: 36653797 PMCID: PMC9847118 DOI: 10.1186/s12906-022-03828-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Accepted: 12/26/2022] [Indexed: 01/19/2023] Open
Abstract
BACKGROUND Metabolic hypertension (MH) has become the most common type of hypertension in recent years due to unhealthy eating habits and lifestyles of people, such as over-eating alcohol, high fat, and sugar diets (ACHFSDs). Therefore, effective means to combat MH are needed. Previous studies have shown that Panax notoginseng (Burkill) F. H. Chen flower saponins (PNFS) can lower blood pressure in spontaneously hypertensive rats (SHR). However, whether it acts on MH and its mechanism of action remain unclear. METHODS: The pharmacodynamic effects of PNFS were evaluated in rats with ACHFSDs-induced MH. The blood pressure, blood biochemical, grip strength, face temperature, vertigo time, and liver index were estimated. The histological changes in the liver and aorta were observed using hematoxylin and eosin staining. The levels of ET-1, TXB2, NO, PGI2, Renin, ACE, Ang II, and ALD in plasma were detected using ELISA. The levels of C3, KLF5, LXRα, and Renin in kidney tissues were measured using qRT-PCR.The expression levels of C3, KLF5, LXRα, and Renin in kidney tissues were examined using Western blotting. RESULTS In the present study, PNFS was found to reduce blood pressure, face temperature, and vertigo time, increase grip strength and improve dyslipidemia in rats with MH. In addition, PNFS decreased the plasma levels of ET-1 and TXB2, elevated the levels of NO and PGI2, and improved pathological aortic injury. Meanwhile, PNFS decreased the plasma levels of Renin, ACE, Ang II, and ALD. QRT-PCR and Western bolt showed that PNFS downregulated C3, KLF5, LXRα, and Renin protein and mRNA expression in the kidneys of rats with MH. CONCLUSION The finding of the present study suggested that PNFS could downregulate C3 and KLF-5 expression in rats with MH, thereby inhibiting the overactivation of the renin-angiotensin-aldosterone system, while improving vascular endothelial function and ultimately reducing blood pressure in rats with MH.
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Affiliation(s)
- Qiqi Huang
- School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou, China
| | - Jie Su
- School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou, China
| | - Jie Xu
- School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou, China
| | - Huanhuan Yu
- School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou, China
| | - Xiaohu Jin
- School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou, China
| | - Yajun Wang
- School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou, China
| | - Meiqiu Yan
- School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou, China
| | - Jingjing Yu
- School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou, China
| | - Suhong Chen
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou, China.
| | - Youhua Wang
- Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
| | - Guiyuan Lv
- School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou, China.
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Chen Y, Han Y, Wu Y, Hui R, Yang Y, Zhong Y, Zhang S, Zhang W. Pharmacogenetic association of the NR1H3 promoter variant with antihypertensive response among patients with hypertension: A longitudinal study. Front Pharmacol 2023; 14:1083134. [PMID: 36950018 PMCID: PMC10025344 DOI: 10.3389/fphar.2023.1083134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Accepted: 02/20/2023] [Indexed: 03/08/2023] Open
Abstract
Background: The genetic factors in assessing therapeutic efficacy and predicting antihypertensive drug response are unclear. Therefore, this study aims to identify the associations between variants and antihypertensive drug response. Methods: A longitudinal study including 1837 hypertensive patients was conducted in Northern China and followed up for a median 2.24 years. The associations of 11 candidate variants with blood pressure changes in response to antihypertensive drugs and with the risk of cardiovascular events during the follow-up were examined. The dual-luciferase assay was carried out to assess the effect of genetic variants on gene transcriptional activity. Results: The variant rs11039149A>G in the promoter of nuclear receptor subfamily 1 group H member 3 (NR1H3) was associated with the change in systolic blood pressure (ΔSBP) in response to calcium channel blockers (CCBs) monotherapy. Patients carrying rs11039149AG genotype showed a significant increase of systolic blood pressure (SBP) at follow-up compared with AA carriers, and the difference of ΔSBP between AG and AA carriers was 5.94 mm Hg (95%CI: 2.09-9.78, p = 0.002). In 1,184 patients with CCBs therapy, SBP levels decreased in AA carriers, but increased in AG carriers, the difference of ΔSBP between AG and AA carriers was 8.04 mm Hg (95%CI: 3.28-12.81, p = 0.001). Further analysis in 359 patients with CCBs monotherapy, the difference of ΔSBP between AG and AA carriers was 15.25 mm Hg (95%CI: 6.48-24.02, p = 0.001). However, there was no significant difference in ΔSBP between AG and AA carriers with CCBs multitherapy. The rs11039149A>G was not associated with the cardiovascular events incidence during the follow-up. Additionally, transcriptional factor forkhead box C1 (FOXC1) bound to the NR1H3 promoter containing rs11039149A and significantly increased the transcriptional activity, while rs11039149 A to G change led to a loss-of-function and disabled FOXC1 binding. For the other 10 variants, associations with blood pressure changes or risk of cardiovascular events were not observed. Conclusion: Hypertensive patients with rs11039149AG genotype in the NR1H3 gene have a significant worse SBP control in response to CCBs monotherapy compared with AA carriers. Our findings suggest that the NR1H3 gene might act as a promising genetic factor to affect individual sensitivity to antihypertensive drugs.
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Affiliation(s)
- Yu Chen
- National Clinical Research Center for Cardiovascular Diseases, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Center for Cardiovascular Diseases, Beijing, China
| | - Yuqing Han
- National Clinical Research Center for Cardiovascular Diseases, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Center for Cardiovascular Diseases, Beijing, China
| | - Yiyi Wu
- The First Affiliated Hospital of Anhui University of Science and Technology, The First People’s Hospital of Huainan City, Huainan, Anhui, China
| | - Rutai Hui
- National Clinical Research Center for Cardiovascular Diseases, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Center for Cardiovascular Diseases, Beijing, China
| | - Yunyun Yang
- Clinical Laboratory, Xiamen Key Laboratory of Genetic Testing, The First Affiliated Hospital of Xiamen University, Xiamen, Fujian, China
| | - Yixuan Zhong
- National Clinical Research Center for Cardiovascular Diseases, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Center for Cardiovascular Diseases, Beijing, China
| | - Shuyuan Zhang
- National Clinical Research Center for Cardiovascular Diseases, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Center for Cardiovascular Diseases, Beijing, China
| | - Weili Zhang
- National Clinical Research Center for Cardiovascular Diseases, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Center for Cardiovascular Diseases, Beijing, China
- Central-China Branch of National Center for Cardiovascular Diseases, Henan Cardiovascular Disease Center, Fuwai Central-China Hospital, Zhengzhou, China
- *Correspondence: Weili Zhang,
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Odnoshivkina UG, Petrov AM. Immune Oxysterol Downregulates the Atrial Inotropic Response to β-Adrenergic Receptor Stimulation: The Role of Liver X Receptors and Lipid Raft Stability. J EVOL BIOCHEM PHYS+ 2022. [DOI: 10.1134/s0022093022070018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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Sweed N, Kim HJ, Hultenby K, Barros R, Parini P, Sancisi V, Strandvik B, Gabbi C. Liver X receptor β regulates bile volume and the expression of aquaporins and cystic fibrosis transmembrane conductance regulator in the gallbladder. Am J Physiol Gastrointest Liver Physiol 2021; 321:G243-G251. [PMID: 34259574 PMCID: PMC8815792 DOI: 10.1152/ajpgi.00024.2021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Revised: 07/02/2021] [Accepted: 07/12/2021] [Indexed: 01/31/2023]
Abstract
The gallbladder is considered an important organ in maintaining digestive and metabolic homeostasis. Given that therapeutic options for gallbladder diseases are often limited to cholecystectomy, understanding gallbladder pathophysiology is essential in developing novel therapeutic strategies. Since liver X receptor β (LXRβ), an oxysterol-activated transcription factor, is strongly expressed in gallbladder cholangiocytes, the aim was to investigate LXRβ physiological function in the gallbladder. Thus, we studied the gallbladders of WT and LXRβ-/- male mice using immunohistochemistry, electron microscopy, qRT-PCR, bile duct cannulation, bile and blood biochemistry, and duodenal pH measurements. LXRβ-/- mice presented a large gallbladder bile volume with high duodenal mRNA levels of the vasoactive intestinal polypeptide (VIP), a strong mediator of gallbladder relaxation. LXRβ-/- gallbladders showed low mRNA and protein expression of Aquaporin-1, Aquaporin-8, and cystic fibrosis transmembrane conductance regulator (CFTR). A cystic fibrosis-resembling phenotype was evident in the liver showing high serum cholestatic markers and the presence of reactive cholangiocytes. For LXRβ being a transcription factor, we identified eight putative binding sites of LXR on the promoter and enhancer of the Cftr gene, suggesting Cftr as a novel LXRβ regulated gene. In conclusion, LXRβ was recognized as a regulator of gallbladder bile volume through multiple mechanisms involving CFTR and aquaporins.NEW & NOTEWORTHY This report reveals a novel and specific role of the nuclear receptor liver X receptor β (LXRβ) in controlling biliary tree pathophysiology. LXRβ-/- mice have high gallbladder bile volume and are affected by a cholangiopathy that resembles cystic fibrosis. We found LXRβ to regulate the expression of both aquaporins water channels and the cystic fibrosis transmembrane conductance regulator. This opens a new field in biliary tree pathophysiology, enlightening a possible transcription factor controlling CFTR expression.
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Affiliation(s)
- Nathan Sweed
- Center for Nuclear Receptors and Cell Signaling, University of Houston, Houston, Texas
| | - Hyun-Jin Kim
- Center for Nuclear Receptors and Cell Signaling, University of Houston, Houston, Texas
| | - Kjell Hultenby
- Department of Laboratory Medicine, Karolinska Institutet, NEO, Stockholm, Sweden
| | - Rodrigo Barros
- Center for Nuclear Receptors and Cell Signaling, University of Houston, Houston, Texas
| | - Paoo Parini
- Division of Clinical Chemistry, Department of Laboratory Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Valentina Sancisi
- Laboratory of Translational Research, Azienda USL Reggio Emilia-IRCCS, Reggio Emilia, Italy
| | - Birgitta Strandvik
- Department of Biosciences and Nutrition, Karolinska Institutet, NEO, Stockholm, Sweden
| | - Chiara Gabbi
- Center for Nuclear Receptors and Cell Signaling, University of Houston, Houston, Texas
- Department of Biosciences and Nutrition, Karolinska Institutet, NEO, Stockholm, Sweden
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Single-cell RNA sequencing reveals the mesangial identity and species diversity of glomerular cell transcriptomes. Nat Commun 2021; 12:2141. [PMID: 33837218 PMCID: PMC8035407 DOI: 10.1038/s41467-021-22331-9] [Citation(s) in RCA: 45] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Accepted: 03/04/2021] [Indexed: 01/06/2023] Open
Abstract
Molecular characterization of the individual cell types in human kidney as well as model organisms are critical in defining organ function and understanding translational aspects of biomedical research. Previous studies have uncovered gene expression profiles of several kidney glomerular cell types, however, important cells, including mesangial (MCs) and glomerular parietal epithelial cells (PECs), are missing or incompletely described, and a systematic comparison between mouse and human kidney is lacking. To this end, we use Smart-seq2 to profile 4332 individual glomerulus-associated cells isolated from human living donor renal biopsies and mouse kidney. The analysis reveals genetic programs for all four glomerular cell types (podocytes, glomerular endothelial cells, MCs and PECs) as well as rare glomerulus-associated macula densa cells. Importantly, we detect heterogeneity in glomerulus-associated Pdgfrb-expressing cells, including bona fide intraglomerular MCs with the functionally active phagocytic molecular machinery, as well as a unique mural cell type located in the central stalk region of the glomerulus tuft. Furthermore, we observe remarkable species differences in the individual gene expression profiles of defined glomerular cell types that highlight translational challenges in the field and provide a guide to design translational studies. The molecular identity of renal glomerular cells is poorly characterized and rodent glomerulopathy models translate poorly to humans. Here, the authors show molecular signatures of glomerulus-associated cells using single cell RNA sequencing and highlight differences between mouse and human cells.
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Goel D, Vohora D. Liver X receptors and skeleton: Current state-of-knowledge. Bone 2021; 144:115807. [PMID: 33333244 DOI: 10.1016/j.bone.2020.115807] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 11/26/2020] [Accepted: 12/11/2020] [Indexed: 12/25/2022]
Abstract
The liver X receptors (LXR) is a nuclear receptor that acts as a prominent regulator of lipid homeostasis and inflammatory response. Its therapeutic effectiveness against various diseases like Alzheimer's disease and atherosclerosis has been investigated in detail. Emerging pieces of evidence now reveal that LXR is also a crucial modulator of bone remodeling. However, the molecular mechanisms underlying the pharmacological actions of LXR on the skeleton and its role in osteoporosis are poorly understood. Therefore, in the current review, we highlight LXR and its actions through different molecular pathways modulating skeletal homeostasis. The studies described in this review propound that LXR in association with estrogen, PTH, PPARγ, RXR hedgehog, and canonical Wnt signaling regulates osteoclastogenesis and bone resorption. It regulates RANKL-induced expression of c-Fos, NFATc1, and NF-κB involved in osteoclast differentiation. Additionally, several studies suggest suppression of RANKL-induced osteoclast differentiation by synthetic LXR ligands. Given the significance of modulation of LXR in various physiological and pathological settings, our findings indicate that therapeutic targeting of LXR might potentially prevent or treat osteoporosis and improve bone quality.
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Affiliation(s)
- Divya Goel
- Department of Pharmacology, School of Pharmaceutical Education and Research (SPER), Jamia Hamdard, New Delhi 110062, India
| | - Divya Vohora
- Department of Pharmacology, School of Pharmaceutical Education and Research (SPER), Jamia Hamdard, New Delhi 110062, India.
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Hukkanen J, Hakkola J. PXR and 4β-Hydroxycholesterol Axis and the Components of Metabolic Syndrome. Cells 2020; 9:cells9112445. [PMID: 33182477 PMCID: PMC7696146 DOI: 10.3390/cells9112445] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Revised: 11/05/2020] [Accepted: 11/06/2020] [Indexed: 01/10/2023] Open
Abstract
Pregnane X receptor (PXR) activation has been found to regulate glucose and lipid metabolism and affect obesity in response to high-fat diets. PXR also modulates vascular tone. In fact, PXR appears to regulate multiple components of metabolic syndrome. In most cases, the effect of PXR action is harmful to metabolic health, and PXR can be hypothesized to play an important role in metabolic disruption elicited by exposure to endocrine-disrupting chemicals. The majority of the data on the effects of PXR activation on metabolic health come from animal and cell culture experiments. However, randomized, placebo-controlled, human trials indicate that the treatment with PXR ligands impairs glucose tolerance and increases 24-h blood pressure and heart rate. In addition, plasma 4β-hydroxycholesterol (4βHC), formed under the control of PXR in the liver, is associated with lower blood pressure in healthy volunteers. Furthermore, 4βHC regulates cholesterol transporters in peripheral tissues and may activate the beneficial reverse HDL cholesterol transport. In this review, we discuss the current knowledge on the role of PXR and the PXR–4βHC axis in the regulation of components of metabolic syndrome.
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Affiliation(s)
- Janne Hukkanen
- Research Unit of Internal Medicine, Biocenter Oulu, Medical Research Center Oulu, University of Oulu and Oulu University Hospital, POB 5000, FI-90014 Oulu, Finland
- Correspondence: (J.H.); (J.H.); Tel.: +358-8-3156212 (J.H.); +358-294-485235 (J.H.)
| | - Jukka Hakkola
- Research Unit of Biomedicine, Biocenter Oulu, Medical Research Center Oulu, University of Oulu and Oulu University Hospital, POB 5000, FI-90014 Oulu, Finland
- Correspondence: (J.H.); (J.H.); Tel.: +358-8-3156212 (J.H.); +358-294-485235 (J.H.)
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Chen L, Fukuda N, Otsuki T, Tanaka S, Nakamura Y, Kobayashi H, Matsumoto T, Abe M. Increased Complement 3 With Suppression of miR-145 Induces the Synthetic Phenotype in Vascular Smooth Muscle Cells From Spontaneously Hypertensive Rats. J Am Heart Assoc 2020; 8:e012327. [PMID: 31070083 PMCID: PMC6585333 DOI: 10.1161/jaha.119.012327] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Background We previously reported that vascular smooth muscle cells (VSMCs) from spontaneously hypertensive rats (SHRs) show the increased expression of complement 3 (C3) and the synthetic phenotype. We targeted the SHR C3 gene (C3 knockout [C3KO] SHRs) by the zinc finger gene editing method. In the current study, we investigated the mechanisms underlying the increased expression of C3 and the role of endogenous C3 in the synthetic phenotype of SHR VSMCs in comparison to cells from Wistar‐Kyoto (WKY) rats and C3KO SHRs. Methods and Results Nonmuscle myosin heavy chain staining of aortas from SHRs at 1 day after birth was stronger in comparison to WKY rats and C3KO SHRs. DNA synthesis in VSMCs from SHRs was significantly higher in comparison to WKY rats and C3KO SHRs. Immunohistochemical staining of renin and liver X receptor α in VSMCs from SHRs was stronger in comparison to WKY rats and C3KO SHRs. The expression of renin, Krüppel‐like factor 5, and liver X receptor α proteins in VSMCs from SHRs was significantly higher in comparison to WKY rats and C3KO SHRs. The expression of synthetic phenotype markers osteopontin, matrix gla, and l‐caldesmon, growth factors transforming growth factor‐β1 and platelet‐derived growth factor‐A, transcription factors Krüppel‐like factor 5 and liver X receptor α, and angiotensinogen mRNAs in VSMCs from SHRs was significantly higher in comparison to WKY rats and C3KO SHRs. The expression of miR‐145 mRNA in VSMCs from SHRs was suppressed in comparison to cells from WKY rats. miR‐145 inhibitor significantly increased the expression of C3 in VSMCs from WKY rats, but not in cells from SHRs. Conclusions These findings indicate that the increased C3 with the suppression of miR‐145 induces the synthetic phenotype through Krüppel‐like factor 5 and the activation of the renin‐angiotensin system through liver X receptor α in VSMCs from SHRs.
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Affiliation(s)
- Lan Chen
- 1 Division of Cell Regeneration and Transplantation Department of Functional Morphology Nihon University School of Medicine Tokyo Japan
| | - Noboru Fukuda
- 1 Division of Cell Regeneration and Transplantation Department of Functional Morphology Nihon University School of Medicine Tokyo Japan.,2 Division of Nephrology, Hypertension, and Endocrinology Department of Medicine Nihon University School of Medicine Tokyo Japan.,3 Research Center Nihon University Tokyo Japan
| | - Tomoyasu Otsuki
- 2 Division of Nephrology, Hypertension, and Endocrinology Department of Medicine Nihon University School of Medicine Tokyo Japan
| | - Sho Tanaka
- 2 Division of Nephrology, Hypertension, and Endocrinology Department of Medicine Nihon University School of Medicine Tokyo Japan
| | - Yoshihiro Nakamura
- 2 Division of Nephrology, Hypertension, and Endocrinology Department of Medicine Nihon University School of Medicine Tokyo Japan
| | - Hiroki Kobayashi
- 2 Division of Nephrology, Hypertension, and Endocrinology Department of Medicine Nihon University School of Medicine Tokyo Japan
| | - Taro Matsumoto
- 1 Division of Cell Regeneration and Transplantation Department of Functional Morphology Nihon University School of Medicine Tokyo Japan
| | - Masanori Abe
- 2 Division of Nephrology, Hypertension, and Endocrinology Department of Medicine Nihon University School of Medicine Tokyo Japan
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Hassani‐Nezhad‐Gashti F, Salonurmi T, Hautajärvi H, Rysä J, Hakkola J, Hukkanen J. Pregnane X Receptor Activator Rifampin Increases Blood Pressure and Stimulates Plasma Renin Activity. Clin Pharmacol Ther 2020; 108:856-865. [DOI: 10.1002/cpt.1871] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 04/20/2020] [Indexed: 12/11/2022]
Affiliation(s)
- Fatemeh Hassani‐Nezhad‐Gashti
- Research Unit of Biomedicine, Pharmacology and Toxicology University of Oulu Oulu Finland
- Biocenter Oulu Oulu Finland
- Medical Research Center Oulu Oulu University Hospital and University of Oulu Oulu Finland
| | - Tuire Salonurmi
- Biocenter Oulu Oulu Finland
- Medical Research Center Oulu Oulu University Hospital and University of Oulu Oulu Finland
- Research Unit of Internal Medicine University of Oulu Oulu Finland
| | | | - Jaana Rysä
- School of Pharmacy Faculty of Health Sciences University of Eastern Finland Kuopio Finland
| | - Jukka Hakkola
- Research Unit of Biomedicine, Pharmacology and Toxicology University of Oulu Oulu Finland
- Biocenter Oulu Oulu Finland
- Medical Research Center Oulu Oulu University Hospital and University of Oulu Oulu Finland
| | - Janne Hukkanen
- Biocenter Oulu Oulu Finland
- Medical Research Center Oulu Oulu University Hospital and University of Oulu Oulu Finland
- Research Unit of Internal Medicine University of Oulu Oulu Finland
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Chen L, Fukuda N, Shimizu S, Kobayashi H, Tanaka S, Nakamura Y, Matsumoto T, Abe M. Role of complement 3 in renin generation during the differentiation of mesenchymal stem cells to smooth muscle cells. Am J Physiol Cell Physiol 2020; 318:C981-C990. [PMID: 32208992 DOI: 10.1152/ajpcell.00461.2019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We showed that increased expression of complement 3 (C3) induces dedifferentiation of mesenchymal cells and epithelial mesenchymal transition, which activate the local renin-angiotensin system (RAS) that contributes to cardiovascular and renal remodeling in spontaneously hypertensive rats (SHRs). In the present study, to investigate contributions of C3 to the development of the pathogenesis of hypertension, we evaluated the formation of renin-producing cells and roles of C3 in renin generation during differentiation of primary bone marrow-mesenchymal stem cells (MSCs) from C57BL/6 mice, Wistar-Kyoto (WKY) rats, and SHRs to smooth muscle cells (SMCs) with transforming growth factor-β1. The expression of renin transiently increased with increases in transcription factor liver X receptor α (LXRα), and expression of C3 and Krüppel-like factor 5 (KLF5) increased during differentiation of MSCs from C57BL/6 mice, WKY rats, and SHRs to SMCs. Exogenous C3a stimulated renin and LXRα expression accompanied by nuclear translocation of LXRα. C3a receptor antagonist SB290157 suppressed renin and LXRα expression, with inhibition of nuclear translocation of LXRα during the differentiation of mouse MSCs to SMCs. The expression of C3 and KLF5 was significantly higher in the differentiated cells from SHRs compared with the cells from WKY rats during differentiation. Renin-producing cells were formed during differentiation of MSCs to SMCs, and renin generation was observed in undifferentiated SMCs, in which transient expression of renin in the differentiated cells with lower differentiation stage was stronger from SHRs than that from WKY rats. Expression and nuclear localization of LXRα in the differentiated cells from SHRs were stronger than that from WKY rats. C3 was important in forming and maintaining this undifferentiated state of SMCs from MSCs to generate renin with increases in transcription factor LXRα and KLF5. Increases in C3 expression maintain the undifferentiated state of SMCs from MSCs to generate renin that activates RAS and contributes to the pathogenesis of hypertension in SHRs.
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Affiliation(s)
- Lan Chen
- Division of Nephrology, Hypertension, and Endocrinology, Department of Internal Medicine, Nihon University School of Medicine, Tokyo, Japan
| | - Noboru Fukuda
- Division of Nephrology, Hypertension, and Endocrinology, Department of Internal Medicine, Nihon University School of Medicine, Tokyo, Japan.,Research Center, Nihon University, Tokyo, Japan.,Division of Cell Regeneration and Transplantation, Department of Functional Morphology, Nihon University School of Medicine, Tokyo, Japan
| | - Shoichi Shimizu
- Department of Pediatrics, Nihon University School of Medicine, Tokyo, Japan
| | - Hiroki Kobayashi
- Division of Nephrology, Hypertension, and Endocrinology, Department of Internal Medicine, Nihon University School of Medicine, Tokyo, Japan
| | - Sho Tanaka
- Division of Nephrology, Hypertension, and Endocrinology, Department of Internal Medicine, Nihon University School of Medicine, Tokyo, Japan
| | - Yoshihiro Nakamura
- Division of Nephrology, Hypertension, and Endocrinology, Department of Internal Medicine, Nihon University School of Medicine, Tokyo, Japan
| | - Taro Matsumoto
- Division of Cell Regeneration and Transplantation, Department of Functional Morphology, Nihon University School of Medicine, Tokyo, Japan
| | - Masanori Abe
- Division of Nephrology, Hypertension, and Endocrinology, Department of Internal Medicine, Nihon University School of Medicine, Tokyo, Japan
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Coats AJS. Figures of the Heart Failure Association (HFA): Dr. Rudolf de Boer, HFA Board Member (2014-2020), Chair of the Basic Science Section (2016-2018), coordinator of the Study Group on Heart Failure with Preserved Ejection Fraction, and member of the HFA study groups of Translational Research and Cardio-oncology. Eur J Heart Fail 2020; 22:572-575. [PMID: 32128968 DOI: 10.1002/ejhf.1779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Accepted: 02/06/2020] [Indexed: 11/09/2022] Open
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Su W, Cao R, Zhang XY, Guan Y. Aquaporins in the kidney: physiology and pathophysiology. Am J Physiol Renal Physiol 2019; 318:F193-F203. [PMID: 31682170 DOI: 10.1152/ajprenal.00304.2019] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
The kidney is the central organ involved in maintaining water and sodium balance. In human kidneys, nine aquaporins (AQPs), including AQP1-8 and AQP11, have been found and are differentially expressed along the renal tubules and collecting ducts with distinct and critical roles in the regulation of body water homeostasis and urine concentration. Dysfunction and dysregulation of these AQPs result in various water balance disorders. This review summarizes current understanding of physiological and pathophysiological roles of AQPs in the kidney, with a focus on recent progress on AQP2 regulation by the nuclear receptor transcriptional factors. This review also provides an overview of AQPs as clinical biomarkers and therapeutic targets for renal diseases.
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Affiliation(s)
- Wen Su
- Department of Pathophysiology, Shenzhen University Health Science Center, Shenzhen University, Shenzhen, China
| | - Rong Cao
- Department of Nephrology, The First Affiliated Hospital of Shenzhen University, Shenzhen, China.,The Second People's Hospital of Shenzhen, Shenzhen, China
| | - Xiao-Yan Zhang
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Advanced Institute for Medical Sciences, Dalian Medical University, Dalian, China
| | - Youfei Guan
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Advanced Institute for Medical Sciences, Dalian Medical University, Dalian, China
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Abstract
Liver X receptors α and β (LXRα and LXRβ) are nuclear receptors with pivotal roles in the transcriptional control of lipid metabolism. Transcriptional activity of LXRs is induced in response to elevated cellular levels of cholesterol. LXRs bind to and regulate the expression of genes that encode proteins involved in cholesterol absorption, transport, efflux, excretion and conversion to bile acids. The coordinated, tissue-specific actions of the LXR pathway maintain systemic cholesterol homeostasis and regulate immune and inflammatory responses. LXRs also regulate fatty acid metabolism by controlling the lipogenic transcription factor sterol regulatory element-binding protein 1c and regulate genes that encode proteins involved in fatty acid elongation and desaturation. LXRs exert important effects on the metabolism of phospholipids, which, along with cholesterol, are major constituents of cellular membranes. LXR activation preferentially drives the incorporation of polyunsaturated fatty acids into phospholipids by inducing transcription of the remodelling enzyme lysophosphatidylcholine acyltransferase 3. The ability of the LXR pathway to couple cellular sterol levels with the saturation of fatty acids in membrane phospholipids has implications for several physiological processes, including lipoprotein production, dietary lipid absorption and intestinal stem cell proliferation. Understanding how LXRs regulate membrane composition and function might provide new therapeutic insight into diseases associated with dysregulated lipid metabolism, including atherosclerosis, diabetes mellitus and cancer.
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Affiliation(s)
- Bo Wang
- Department of Pathology and Laboratory Medicine, Molecular Biology Institute, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
| | - Peter Tontonoz
- Department of Pathology and Laboratory Medicine, Molecular Biology Institute, David Geffen School of Medicine, University of California, Los Angeles, CA, USA.
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Wongwan T, Kittayaruksakul S, Asavapanumas N, Chatsudthipong V, Soodvilai S. Activation of liver X receptor inhibits OCT2-mediated organic cation transport in renal proximal tubular cells. Pflugers Arch 2017; 469:1471-1481. [PMID: 28741179 DOI: 10.1007/s00424-017-2033-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Revised: 07/09/2017] [Accepted: 07/11/2017] [Indexed: 01/05/2023]
Abstract
Liver X receptor (LXR) is transcriptional factor that plays an important role in the regulation of energy metabolism such as cholesterol, lipid, and glucose metabolism as well as membrane transporters and channels. Using both in vitro and in vivo models, LXR regulation of the expression and function of renal organic cation transporter 2 (OCT2) was observed. Synthetic LXR agonist (GW3965) and endogenous LXR agonist (22R-hydroxycholesterol) significantly reduced the uptake of 3H-MPP+, a prototypic substrate of OCT2, in both OCT2- Chinese hamster ovary K1 and human renal proximal tubular cells (RPTEC/TERT1). GW3965 decreased transport activity of OCT2 via a reduction of the maximal transport rate of MPP+ without affecting transporter affinity. The inhibitory effect of GW3965 was attenuated by co-treatment with LXR antagonist (fenofibrate) indicating the inhibition was LXR-dependent mechanism. In addition, co-treatment with a retinoic X receptor (RXR) ligand, 9-cis retinoic acid enhanced the inhibitory effect of GW3965, indicating negative regulation of OCT2 transport activity by the LXR/RXR complex. Treatment RPTEC/TERT1 cells with GW3965 significantly reduced OCT2 protein expression without changing mRNA expression. In parallel, the effect of LXR activation on OCT2 function was investigated in intact mouse kidney. Treating mice with 50 mg/kg BW T0901317 for 14 days significantly decreased 3H-MPP+ uptake into renal cortical slices, correlating with decreased OCT2 protein expression in renal cortex without changes in mRNA expression levels. Taken together, LXR/RXR activation downregulates the protein expression and function of OCT2 in renal proximal tubule, suggesting LXR might affect the total profile of renal excretion of cationic compounds.
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Affiliation(s)
- Teerasak Wongwan
- Department of Physiology, Faculty of Science, Mahidol University, Rama VI Road, Rajathevi, Bangkok, 10400, Thailand.,Research Center of Transport Proteins for Medical Innovation, Faculty of Science, Mahidol University, Rajathevi, Bangkok, 10400, Thailand
| | - Suticha Kittayaruksakul
- Department of Physiology, Faculty of Science, Mahidol University, Rama VI Road, Rajathevi, Bangkok, 10400, Thailand
| | - Nithi Asavapanumas
- Department of Physiology, Faculty of Science, Mahidol University, Rama VI Road, Rajathevi, Bangkok, 10400, Thailand
| | - Varanuj Chatsudthipong
- Department of Physiology, Faculty of Science, Mahidol University, Rama VI Road, Rajathevi, Bangkok, 10400, Thailand
| | - Sunhapas Soodvilai
- Department of Physiology, Faculty of Science, Mahidol University, Rama VI Road, Rajathevi, Bangkok, 10400, Thailand. .,Research Center of Transport Proteins for Medical Innovation, Faculty of Science, Mahidol University, Rajathevi, Bangkok, 10400, Thailand. .,Excellent Center for Drug Discovery, Mahidol University, Rama VI Road, Rajathevi, Bangkok, 10400, Thailand.
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Martini AG, Xa LK, Lacombe MJ, Blanchet-Cohen A, Mercure C, Haibe-Kains B, Friesema ECH, van den Meiracker AH, Gross KW, Azizi M, Corvol P, Nguyen G, Reudelhuber TL, Danser AHJ. Transcriptome Analysis of Human Reninomas as an Approach to Understanding Juxtaglomerular Cell Biology. Hypertension 2017; 69:1145-1155. [PMID: 28396539 DOI: 10.1161/hypertensionaha.117.09179] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Revised: 02/19/2017] [Accepted: 03/07/2017] [Indexed: 12/15/2022]
Abstract
Renin, a key component in the regulation of blood pressure in mammals, is produced by the rare and highly specialized juxtaglomerular cells of the kidney. Chronic stimulation of renin release results in a recruitment of new juxtaglomerular cells by the apparent conversion of adjacent smooth muscle cells along the afferent arterioles. Because juxtaglomerular cells rapidly dedifferentiate when removed from the kidney, their developmental origin and the mechanism that explains their phenotypic plasticity remain unclear. To overcome this limitation, we have performed RNA expression analysis on 4 human renin-producing tumors. The most highly expressed genes that were common between the reninomas were subsequently used for in situ hybridization in kidneys of 5-day-old mice, adult mice, and adult mice treated with captopril. From the top 100 genes, 10 encoding for ligands were selected for further analysis. Medium of human embryonic kidney 293 cells transfected with the mouse cDNA encoding these ligands was applied to (pro)renin-synthesizing As4.1 cells. Among the ligands, only platelet-derived growth factor B reduced the medium and cellular (pro)renin levels, as well as As4.1 renin gene expression. In addition, platelet-derived growth factor B-exposed As4.1 cells displayed a more elongated and aligned shape with no alteration in viability. This was accompanied by a downregulated expression of α-smooth muscle actin and an upregulated expression of interleukin-6, suggesting a phenotypic shift from myoendocrine to inflammatory. Our results add 36 new genes to the list that characterize renin-producing cells and reveal a novel role for platelet-derived growth factor B as a regulator of renin-synthesizing cells.
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Affiliation(s)
- Alexandre G Martini
- From the Department of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands (A.G.M., E.C.H.F., A.H.v.d.M., A.H.J.D.); Laboratory of Molecular Biochemistry of Hypertension (L.K.X., M.-J.L., C.M., T.L.R.) and Laboratory of Bioinformatics and Computational Genomics (A.B.-C., B.H.-K.), Institut de Recherches Cliniques de Montréal (IRCM), Quebec, Canada; Division of Experimental Medicine, Faculty of Medicine, McGill University, Montréal, Quebec, Canada (L.K.X., T.L.R.); Department of Biochemistry (B.H.-K., T.L.R.) and Department of Medicine (T.L.R.), Université de Montréal, Quebec, Canada; Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Buffalo, NY (K.W.G.); Hôpital Européen Georges Pompidou, Centre d'Investigations Cliniques 1418, Paris, France (M.A.); Collège de France, Center for Interdisciplinary Research in Biology (CIRB), Paris, France (P.C., G.N.); and INSERM, U1050, Paris, France (G.N.)
| | - Lucie K Xa
- From the Department of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands (A.G.M., E.C.H.F., A.H.v.d.M., A.H.J.D.); Laboratory of Molecular Biochemistry of Hypertension (L.K.X., M.-J.L., C.M., T.L.R.) and Laboratory of Bioinformatics and Computational Genomics (A.B.-C., B.H.-K.), Institut de Recherches Cliniques de Montréal (IRCM), Quebec, Canada; Division of Experimental Medicine, Faculty of Medicine, McGill University, Montréal, Quebec, Canada (L.K.X., T.L.R.); Department of Biochemistry (B.H.-K., T.L.R.) and Department of Medicine (T.L.R.), Université de Montréal, Quebec, Canada; Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Buffalo, NY (K.W.G.); Hôpital Européen Georges Pompidou, Centre d'Investigations Cliniques 1418, Paris, France (M.A.); Collège de France, Center for Interdisciplinary Research in Biology (CIRB), Paris, France (P.C., G.N.); and INSERM, U1050, Paris, France (G.N.)
| | - Marie-Josée Lacombe
- From the Department of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands (A.G.M., E.C.H.F., A.H.v.d.M., A.H.J.D.); Laboratory of Molecular Biochemistry of Hypertension (L.K.X., M.-J.L., C.M., T.L.R.) and Laboratory of Bioinformatics and Computational Genomics (A.B.-C., B.H.-K.), Institut de Recherches Cliniques de Montréal (IRCM), Quebec, Canada; Division of Experimental Medicine, Faculty of Medicine, McGill University, Montréal, Quebec, Canada (L.K.X., T.L.R.); Department of Biochemistry (B.H.-K., T.L.R.) and Department of Medicine (T.L.R.), Université de Montréal, Quebec, Canada; Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Buffalo, NY (K.W.G.); Hôpital Européen Georges Pompidou, Centre d'Investigations Cliniques 1418, Paris, France (M.A.); Collège de France, Center for Interdisciplinary Research in Biology (CIRB), Paris, France (P.C., G.N.); and INSERM, U1050, Paris, France (G.N.)
| | - Alexis Blanchet-Cohen
- From the Department of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands (A.G.M., E.C.H.F., A.H.v.d.M., A.H.J.D.); Laboratory of Molecular Biochemistry of Hypertension (L.K.X., M.-J.L., C.M., T.L.R.) and Laboratory of Bioinformatics and Computational Genomics (A.B.-C., B.H.-K.), Institut de Recherches Cliniques de Montréal (IRCM), Quebec, Canada; Division of Experimental Medicine, Faculty of Medicine, McGill University, Montréal, Quebec, Canada (L.K.X., T.L.R.); Department of Biochemistry (B.H.-K., T.L.R.) and Department of Medicine (T.L.R.), Université de Montréal, Quebec, Canada; Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Buffalo, NY (K.W.G.); Hôpital Européen Georges Pompidou, Centre d'Investigations Cliniques 1418, Paris, France (M.A.); Collège de France, Center for Interdisciplinary Research in Biology (CIRB), Paris, France (P.C., G.N.); and INSERM, U1050, Paris, France (G.N.)
| | - Chantal Mercure
- From the Department of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands (A.G.M., E.C.H.F., A.H.v.d.M., A.H.J.D.); Laboratory of Molecular Biochemistry of Hypertension (L.K.X., M.-J.L., C.M., T.L.R.) and Laboratory of Bioinformatics and Computational Genomics (A.B.-C., B.H.-K.), Institut de Recherches Cliniques de Montréal (IRCM), Quebec, Canada; Division of Experimental Medicine, Faculty of Medicine, McGill University, Montréal, Quebec, Canada (L.K.X., T.L.R.); Department of Biochemistry (B.H.-K., T.L.R.) and Department of Medicine (T.L.R.), Université de Montréal, Quebec, Canada; Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Buffalo, NY (K.W.G.); Hôpital Européen Georges Pompidou, Centre d'Investigations Cliniques 1418, Paris, France (M.A.); Collège de France, Center for Interdisciplinary Research in Biology (CIRB), Paris, France (P.C., G.N.); and INSERM, U1050, Paris, France (G.N.)
| | - Benjamin Haibe-Kains
- From the Department of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands (A.G.M., E.C.H.F., A.H.v.d.M., A.H.J.D.); Laboratory of Molecular Biochemistry of Hypertension (L.K.X., M.-J.L., C.M., T.L.R.) and Laboratory of Bioinformatics and Computational Genomics (A.B.-C., B.H.-K.), Institut de Recherches Cliniques de Montréal (IRCM), Quebec, Canada; Division of Experimental Medicine, Faculty of Medicine, McGill University, Montréal, Quebec, Canada (L.K.X., T.L.R.); Department of Biochemistry (B.H.-K., T.L.R.) and Department of Medicine (T.L.R.), Université de Montréal, Quebec, Canada; Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Buffalo, NY (K.W.G.); Hôpital Européen Georges Pompidou, Centre d'Investigations Cliniques 1418, Paris, France (M.A.); Collège de France, Center for Interdisciplinary Research in Biology (CIRB), Paris, France (P.C., G.N.); and INSERM, U1050, Paris, France (G.N.)
| | - Edith C H Friesema
- From the Department of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands (A.G.M., E.C.H.F., A.H.v.d.M., A.H.J.D.); Laboratory of Molecular Biochemistry of Hypertension (L.K.X., M.-J.L., C.M., T.L.R.) and Laboratory of Bioinformatics and Computational Genomics (A.B.-C., B.H.-K.), Institut de Recherches Cliniques de Montréal (IRCM), Quebec, Canada; Division of Experimental Medicine, Faculty of Medicine, McGill University, Montréal, Quebec, Canada (L.K.X., T.L.R.); Department of Biochemistry (B.H.-K., T.L.R.) and Department of Medicine (T.L.R.), Université de Montréal, Quebec, Canada; Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Buffalo, NY (K.W.G.); Hôpital Européen Georges Pompidou, Centre d'Investigations Cliniques 1418, Paris, France (M.A.); Collège de France, Center for Interdisciplinary Research in Biology (CIRB), Paris, France (P.C., G.N.); and INSERM, U1050, Paris, France (G.N.)
| | - Anton H van den Meiracker
- From the Department of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands (A.G.M., E.C.H.F., A.H.v.d.M., A.H.J.D.); Laboratory of Molecular Biochemistry of Hypertension (L.K.X., M.-J.L., C.M., T.L.R.) and Laboratory of Bioinformatics and Computational Genomics (A.B.-C., B.H.-K.), Institut de Recherches Cliniques de Montréal (IRCM), Quebec, Canada; Division of Experimental Medicine, Faculty of Medicine, McGill University, Montréal, Quebec, Canada (L.K.X., T.L.R.); Department of Biochemistry (B.H.-K., T.L.R.) and Department of Medicine (T.L.R.), Université de Montréal, Quebec, Canada; Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Buffalo, NY (K.W.G.); Hôpital Européen Georges Pompidou, Centre d'Investigations Cliniques 1418, Paris, France (M.A.); Collège de France, Center for Interdisciplinary Research in Biology (CIRB), Paris, France (P.C., G.N.); and INSERM, U1050, Paris, France (G.N.)
| | - Kenneth W Gross
- From the Department of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands (A.G.M., E.C.H.F., A.H.v.d.M., A.H.J.D.); Laboratory of Molecular Biochemistry of Hypertension (L.K.X., M.-J.L., C.M., T.L.R.) and Laboratory of Bioinformatics and Computational Genomics (A.B.-C., B.H.-K.), Institut de Recherches Cliniques de Montréal (IRCM), Quebec, Canada; Division of Experimental Medicine, Faculty of Medicine, McGill University, Montréal, Quebec, Canada (L.K.X., T.L.R.); Department of Biochemistry (B.H.-K., T.L.R.) and Department of Medicine (T.L.R.), Université de Montréal, Quebec, Canada; Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Buffalo, NY (K.W.G.); Hôpital Européen Georges Pompidou, Centre d'Investigations Cliniques 1418, Paris, France (M.A.); Collège de France, Center for Interdisciplinary Research in Biology (CIRB), Paris, France (P.C., G.N.); and INSERM, U1050, Paris, France (G.N.)
| | - Michel Azizi
- From the Department of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands (A.G.M., E.C.H.F., A.H.v.d.M., A.H.J.D.); Laboratory of Molecular Biochemistry of Hypertension (L.K.X., M.-J.L., C.M., T.L.R.) and Laboratory of Bioinformatics and Computational Genomics (A.B.-C., B.H.-K.), Institut de Recherches Cliniques de Montréal (IRCM), Quebec, Canada; Division of Experimental Medicine, Faculty of Medicine, McGill University, Montréal, Quebec, Canada (L.K.X., T.L.R.); Department of Biochemistry (B.H.-K., T.L.R.) and Department of Medicine (T.L.R.), Université de Montréal, Quebec, Canada; Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Buffalo, NY (K.W.G.); Hôpital Européen Georges Pompidou, Centre d'Investigations Cliniques 1418, Paris, France (M.A.); Collège de France, Center for Interdisciplinary Research in Biology (CIRB), Paris, France (P.C., G.N.); and INSERM, U1050, Paris, France (G.N.)
| | - Pierre Corvol
- From the Department of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands (A.G.M., E.C.H.F., A.H.v.d.M., A.H.J.D.); Laboratory of Molecular Biochemistry of Hypertension (L.K.X., M.-J.L., C.M., T.L.R.) and Laboratory of Bioinformatics and Computational Genomics (A.B.-C., B.H.-K.), Institut de Recherches Cliniques de Montréal (IRCM), Quebec, Canada; Division of Experimental Medicine, Faculty of Medicine, McGill University, Montréal, Quebec, Canada (L.K.X., T.L.R.); Department of Biochemistry (B.H.-K., T.L.R.) and Department of Medicine (T.L.R.), Université de Montréal, Quebec, Canada; Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Buffalo, NY (K.W.G.); Hôpital Européen Georges Pompidou, Centre d'Investigations Cliniques 1418, Paris, France (M.A.); Collège de France, Center for Interdisciplinary Research in Biology (CIRB), Paris, France (P.C., G.N.); and INSERM, U1050, Paris, France (G.N.)
| | - Geneviève Nguyen
- From the Department of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands (A.G.M., E.C.H.F., A.H.v.d.M., A.H.J.D.); Laboratory of Molecular Biochemistry of Hypertension (L.K.X., M.-J.L., C.M., T.L.R.) and Laboratory of Bioinformatics and Computational Genomics (A.B.-C., B.H.-K.), Institut de Recherches Cliniques de Montréal (IRCM), Quebec, Canada; Division of Experimental Medicine, Faculty of Medicine, McGill University, Montréal, Quebec, Canada (L.K.X., T.L.R.); Department of Biochemistry (B.H.-K., T.L.R.) and Department of Medicine (T.L.R.), Université de Montréal, Quebec, Canada; Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Buffalo, NY (K.W.G.); Hôpital Européen Georges Pompidou, Centre d'Investigations Cliniques 1418, Paris, France (M.A.); Collège de France, Center for Interdisciplinary Research in Biology (CIRB), Paris, France (P.C., G.N.); and INSERM, U1050, Paris, France (G.N.)
| | - Timothy L Reudelhuber
- From the Department of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands (A.G.M., E.C.H.F., A.H.v.d.M., A.H.J.D.); Laboratory of Molecular Biochemistry of Hypertension (L.K.X., M.-J.L., C.M., T.L.R.) and Laboratory of Bioinformatics and Computational Genomics (A.B.-C., B.H.-K.), Institut de Recherches Cliniques de Montréal (IRCM), Quebec, Canada; Division of Experimental Medicine, Faculty of Medicine, McGill University, Montréal, Quebec, Canada (L.K.X., T.L.R.); Department of Biochemistry (B.H.-K., T.L.R.) and Department of Medicine (T.L.R.), Université de Montréal, Quebec, Canada; Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Buffalo, NY (K.W.G.); Hôpital Européen Georges Pompidou, Centre d'Investigations Cliniques 1418, Paris, France (M.A.); Collège de France, Center for Interdisciplinary Research in Biology (CIRB), Paris, France (P.C., G.N.); and INSERM, U1050, Paris, France (G.N.)
| | - A H Jan Danser
- From the Department of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands (A.G.M., E.C.H.F., A.H.v.d.M., A.H.J.D.); Laboratory of Molecular Biochemistry of Hypertension (L.K.X., M.-J.L., C.M., T.L.R.) and Laboratory of Bioinformatics and Computational Genomics (A.B.-C., B.H.-K.), Institut de Recherches Cliniques de Montréal (IRCM), Quebec, Canada; Division of Experimental Medicine, Faculty of Medicine, McGill University, Montréal, Quebec, Canada (L.K.X., T.L.R.); Department of Biochemistry (B.H.-K., T.L.R.) and Department of Medicine (T.L.R.), Université de Montréal, Quebec, Canada; Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Buffalo, NY (K.W.G.); Hôpital Européen Georges Pompidou, Centre d'Investigations Cliniques 1418, Paris, France (M.A.); Collège de France, Center for Interdisciplinary Research in Biology (CIRB), Paris, France (P.C., G.N.); and INSERM, U1050, Paris, France (G.N.).
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Yang T, Xu C. Physiology and Pathophysiology of the Intrarenal Renin-Angiotensin System: An Update. J Am Soc Nephrol 2017; 28:1040-1049. [PMID: 28255001 DOI: 10.1681/asn.2016070734] [Citation(s) in RCA: 149] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
The renin-angiotensin system (RAS) has a pivotal role in the maintenance of extracellular volume homeostasis and blood pressure through complex mechanisms. Apart from the well known systemic RAS, occurrence of a local RAS has been documented in multiple tissues, including the kidney. A large body of recent evidence from pharmacologic and genetic studies, particularly those using various transgenic approaches to manipulate intrarenal levels of RAS components, has established the important role of intrarenal RAS in hypertension. Recent studies have also begun to unravel the molecular mechanisms that govern intrarenal RAS activity. This local system is under the control of complex regulatory networks consisting of positive regulators of (pro)renin receptor, Wnt/β-catenin signaling, and PGE2/PGE2 receptor EP4 subtype, and negative regulators of Klotho, vitamin D receptor, and liver X receptors. This review highlights recent advances in defining the regulation and function of intrarenal RAS as a unique entity separate from systemic angiotensin II generation.
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Affiliation(s)
- Tianxin Yang
- Internal Medicine, University of Utah and Veterans Affairs Medical Center, Salt Lake City, Utah; and .,Institute of Hypertension, Sun Yat-sen University School of Medicine, Guangzhou, China
| | - Chuanming Xu
- Institute of Hypertension, Sun Yat-sen University School of Medicine, Guangzhou, China
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Su W, Huang SZ, Gao M, Kong XM, Gustafsson JÅ, Xu SJ, Wang B, Zheng F, Chen LH, Wang NP, Guan YF, Zhang XY. Liver X receptor β increases aquaporin 2 protein level via a posttranscriptional mechanism in renal collecting ducts. Am J Physiol Renal Physiol 2017; 312:F619-F628. [PMID: 28052875 DOI: 10.1152/ajprenal.00564.2016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Revised: 12/19/2016] [Accepted: 12/27/2016] [Indexed: 01/22/2023] Open
Abstract
Liver X receptors (LXRs) including LXRα and LXRβ are nuclear receptor transcription factors and play an important role in lipid and glucose metabolism. It has been previously reported that mice lacking LXRβ but not LXRα develop a severe urine concentrating defect, likely via a central mechanism. Here we provide evidence that LXRβ regulates water homeostasis through increasing aquaporin 2 (AQP2) protein levels in renal collecting ducts. LXRβ-/- mice exhibited a reduced response to desmopressin (dDAVP) stimulation, suggesting that the diabetes insipidus phenotype is of both central and nephrogenic origin. AQP2 protein abundance in the renal inner medulla was significantly reduced in LXRβ-/- mice but with little change in AQP2 mRNA levels. In vitro studies showed that AQP2 protein levels were elevated upon LXR agonist treatment in both primary cultured mouse inner medullary duct cells (mIMCD) and the mIMCD3 cell line with stably expressed AQP2. In addition, LXR agonists including TO901317 and GW3965 failed to induce AQP2 gene transcription but diminished its protein ubiquitination in primary cultured mIMCD cells, thereby inhibiting its degradation. Moreover, LXR activation-induced AQP2 protein expression was abolished by the protease inhibitor MG132 and the ubiquitination-deficient AQP2 (K270R). Taken together, the present study demonstrates that activation of LXRβ increases AQP2 protein levels in the renal collecting ducts via a posttranscriptional mechanism. As such, LXRβ represents a key regulator of body water homeostasis.
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Affiliation(s)
- Wen Su
- AstraZeneca-Shenzhen University Joint Institute of Nephrology, Shenzhen University Health Science Center, Shenzhen University, Shenzhen, China
| | - Shi-Zheng Huang
- Department of Physiology and Pathophysiology, Peking University Health Science Center, Beijing, China
| | - Min Gao
- Department of Physiology and Pathophysiology, Peking University Health Science Center, Beijing, China
| | - Xiao-Mu Kong
- Department of Physiology and Pathophysiology, Peking University Health Science Center, Beijing, China
| | - Jan-Åke Gustafsson
- Center for Nuclear Receptors and Cell Signaling, Department of Biology and Biochemistry, University of Houston, Houston, Texas.,Center for Biosciences, Department of Biosciences and Nutrition, Karolinska Institutet, Novum, Stockholm, Sweden; and
| | - Su-Juan Xu
- Advanced Institute for Medical Sciences, Dalian Medical University, Dalian, Liaoning, China
| | - Bing Wang
- Advanced Institute for Medical Sciences, Dalian Medical University, Dalian, Liaoning, China
| | - Feng Zheng
- Advanced Institute for Medical Sciences, Dalian Medical University, Dalian, Liaoning, China
| | - Li-Hong Chen
- Advanced Institute for Medical Sciences, Dalian Medical University, Dalian, Liaoning, China
| | - Nan-Ping Wang
- Advanced Institute for Medical Sciences, Dalian Medical University, Dalian, Liaoning, China
| | - You-Fei Guan
- Advanced Institute for Medical Sciences, Dalian Medical University, Dalian, Liaoning, China
| | - Xiao-Yan Zhang
- Advanced Institute for Medical Sciences, Dalian Medical University, Dalian, Liaoning, China
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20
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Obesity-related glomerulopathy: clinical and pathologic characteristics and pathogenesis. Nat Rev Nephrol 2016; 12:453-71. [PMID: 27263398 DOI: 10.1038/nrneph.2016.75] [Citation(s) in RCA: 432] [Impact Index Per Article: 54.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The prevalence of obesity-related glomerulopathy is increasing in parallel with the worldwide obesity epidemic. Glomerular hypertrophy and adaptive focal segmental glomerulosclerosis define the condition pathologically. The glomerulus enlarges in response to obesity-induced increases in glomerular filtration rate, renal plasma flow, filtration fraction and tubular sodium reabsorption. Normal insulin/phosphatidylinositol 3-kinase/Akt and mTOR signalling are critical for podocyte hypertrophy and adaptation. Adipokines and ectopic lipid accumulation in the kidney promote insulin resistance of podocytes and maladaptive responses to cope with the mechanical forces of renal hyperfiltration. Although most patients have stable or slowly progressive proteinuria, up to one-third develop progressive renal failure and end-stage renal disease. Renin-angiotensin-aldosterone blockade is effective in the short-term but weight loss by hypocaloric diet or bariatric surgery has induced more consistent and dramatic antiproteinuric effects and reversal of hyperfiltration. Altered fatty acid and cholesterol metabolism are increasingly recognized as key mediators of renal lipid accumulation, inflammation, oxidative stress and fibrosis. Newer therapies directed to lipid metabolism, including SREBP antagonists, PPARα agonists, FXR and TGR5 agonists, and LXR agonists, hold therapeutic promise.
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21
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Once and for all, LXRα and LXRβ are gatekeepers of the endocrine system. Mol Aspects Med 2016; 49:31-46. [DOI: 10.1016/j.mam.2016.04.001] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Revised: 03/08/2016] [Accepted: 04/10/2016] [Indexed: 01/08/2023]
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22
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Cannon MV, Silljé HHW, Sijbesma JWA, Vreeswijk-Baudoin I, Ciapaite J, van der Sluis B, van Deursen J, Silva GJJ, de Windt LJ, Gustafsson JÅ, van der Harst P, van Gilst WH, de Boer RA. Cardiac LXRα protects against pathological cardiac hypertrophy and dysfunction by enhancing glucose uptake and utilization. EMBO Mol Med 2016; 7:1229-43. [PMID: 26160456 PMCID: PMC4568954 DOI: 10.15252/emmm.201404669] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Pathological cardiac hypertrophy is characterized by a shift in metabolic substrate utilization from fatty acids to glucose, but the molecular events underlying the metabolic remodeling remain poorly understood. Here, we investigated the role of liver X receptors (LXRs), which are key regulators of glucose and lipid metabolism, in cardiac hypertrophic pathogenesis. Using a transgenic approach in mice, we show that overexpression of LXRα acts to protect the heart against hypertrophy, fibrosis, and dysfunction. Gene expression profiling studies revealed that genes regulating metabolic pathways were differentially expressed in hearts with elevated LXRα. Functionally, LXRα overexpression in isolated cardiomyocytes and murine hearts markedly enhanced the capacity for myocardial glucose uptake following hypertrophic stress. Conversely, this adaptive response was diminished in LXRα-deficient mice. Transcriptional changes induced by LXRα overexpression promoted energy-independent utilization of glucose via the hexosamine biosynthesis pathway, resulting in O-GlcNAc modification of GATA4 and Mef2c and the induction of cytoprotective natriuretic peptide expression. Our results identify LXRα as a key cardiac transcriptional regulator that helps orchestrate an adaptive metabolic response to chronic cardiac stress, and suggest that modulating LXRα may provide a unique opportunity for intervening in myocyte metabolism.
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Affiliation(s)
- Megan V Cannon
- Department of Cardiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Herman H W Silljé
- Department of Cardiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Jürgen W A Sijbesma
- Department of Nuclear Medicine, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Inge Vreeswijk-Baudoin
- Department of Cardiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Jolita Ciapaite
- Department Pediatrics, Center for Liver, Digestive and Metabolic Diseases, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Bart van der Sluis
- Department of Pathology and Medical Biology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Jan van Deursen
- Department of Biochemistry & Molecular Biology, Mayo Clinic, Rochester, MN, USA
| | - Gustavo J J Silva
- Department of Cardiology, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, The Netherlands
| | - Leon J de Windt
- Department of Cardiology, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, The Netherlands
| | - Jan-Åke Gustafsson
- Department of Biology and Biochemistry, University of Houston, Houston, TX, USA Department of Biosciences and Nutrition, Novum, Karolinska Institutet, Huddinge, Sweden
| | - Pim van der Harst
- Department of Cardiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Wiek H van Gilst
- Department of Cardiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Rudolf A de Boer
- Department of Cardiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
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Soluble (pro)renin receptor via β-catenin enhances urine concentration capability as a target of liver X receptor. Proc Natl Acad Sci U S A 2016; 113:E1898-906. [PMID: 26984496 DOI: 10.1073/pnas.1602397113] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The extracellular domain of the (pro)renin receptor (PRR) is cleaved to produce a soluble (pro)renin receptor (sPRR) that is detected in biological fluid and elevated under certain pathological conditions. The present study was performed to define the antidiuretic action of sPRR and its potential interaction with liver X receptors (LXRs), which are known regulators of urine-concentrating capability. Water deprivation consistently elevated urinary sPRR excretion in mice and humans. A template-based algorithm for protein-protein interaction predicted the interaction between sPRR and frizzled-8 (FZD8), which subsequently was confirmed by coimmunoprecipitation. A recombinant histidine-tagged sPRR (sPRR-His) in the nanomolar range induced a remarkable increase in the abundance of renal aquaporin 2 (AQP2) protein in primary rat inner medullary collecting duct cells. The AQP2 up-regulation relied on sequential activation of FZD8-dependent β-catenin signaling and cAMP-PKA pathways. Inhibition of FZD8 or tankyrase in rats induced polyuria, polydipsia, and hyperosmotic urine. Administration of sPRR-His alleviated the symptoms of diabetes insipidus induced in mice by vasopressin 2 receptor antagonism. Administration of the LXR agonist TO901317 to C57/BL6 mice induced polyuria and suppressed renal AQP2 expression associated with reduced renal PRR expression and urinary sPRR excretion. Administration of sPRR-His reversed most of the effects of TO901317. In cultured collecting duct cells, TO901317 suppressed PRR protein expression, sPRR release, and PRR transcriptional activity. Overall we demonstrate, for the first time to our knowledge, that sPRR exerts antidiuretic action via FZD8-dependent stimulation of AQP2 expression and that inhibition of this pathway contributes to the pathogenesis of diabetes insipidus induced by LXR agonism.
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24
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Martín-Peláez S, Castañer O, Konstantinidou V, Subirana I, Muñoz-Aguayo D, Blanchart G, Gaixas S, de la Torre R, Farré M, Sáez GT, Nyyssönen K, Zunft HJ, Covas MI, Fitó M. Effect of olive oil phenolic compounds on the expression of blood pressure-related genes in healthy individuals. Eur J Nutr 2015; 56:663-670. [PMID: 26658900 DOI: 10.1007/s00394-015-1110-z] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Accepted: 11/22/2015] [Indexed: 12/29/2022]
Abstract
PURPOSE To investigate whether the ingestion of olive oil having different phenolic contents influences the expression of blood pressure-related genes, involved in the renin-angiotensin-aldosterone system, in healthy humans. METHODS A randomized, double-blind, crossover human trial with 18 healthy subjects, who ingested 25 mL/day of olive oils (1) high (366 mg/kg, HPC) and (2) low (2.7 mg/kg, LPC) in phenolic compounds for 3 weeks, preceded by 2-week washout periods. Determination of selected blood pressure-related gene expression in peripheral blood mononuclear cells (PBMNC) by qPCR, blood pressure and systemic biomarkers. RESULTS HPC decreased systolic blood pressure compared to pre-intervention values and to LPC, and maintained diastolic blood pressure values compared to LPC. HPC decreased ACE and NR1H2 gene expressions compared with pre-intervention values, and IL8RA gene expression compared with LPC. CONCLUSIONS The introduction to the diet of an extra-virgin olive oil rich in phenolic compounds modulates the expression of some of the genes related to the renin-angiotensin-aldosterone system. These changes could underlie the decrease in systolic blood pressure observed.
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Affiliation(s)
- Sandra Martín-Peláez
- Cardiovascular Risk and Nutrition Research Group, REGICOR Study Group, Hospital del Mar Research Institute (IMIM), Doctor Aiguader 88, 08003, Barcelona, Spain
- Spanish Biomedical Research Networking Centre (CIBER), Physiopathology of Obesity and Nutrition (CIBERobn), Instituto de Salud Carlos III, Madrid, Spain
| | - Olga Castañer
- Cardiovascular Risk and Nutrition Research Group, REGICOR Study Group, Hospital del Mar Research Institute (IMIM), Doctor Aiguader 88, 08003, Barcelona, Spain
- Spanish Biomedical Research Networking Centre (CIBER), Physiopathology of Obesity and Nutrition (CIBERobn), Instituto de Salud Carlos III, Madrid, Spain
| | - Valentini Konstantinidou
- Cardiovascular Risk and Nutrition Research Group, REGICOR Study Group, Hospital del Mar Research Institute (IMIM), Doctor Aiguader 88, 08003, Barcelona, Spain
| | - Isaac Subirana
- Cardiovascular and Genetic Epidemiology Research Group, REGICOR Study Group, IMIM, Doctor Aiguader 88, 08003, Barcelona, Spain
- Spanish Biomedical Research Networking Centre (CIBER), Epidemiology and Public Health (CIBEResp), Instituto de Salud Carlos III, Madrid, Spain
| | - Daniel Muñoz-Aguayo
- Cardiovascular Risk and Nutrition Research Group, REGICOR Study Group, Hospital del Mar Research Institute (IMIM), Doctor Aiguader 88, 08003, Barcelona, Spain
- Spanish Biomedical Research Networking Centre (CIBER), Physiopathology of Obesity and Nutrition (CIBERobn), Instituto de Salud Carlos III, Madrid, Spain
| | - Gemma Blanchart
- Cardiovascular Risk and Nutrition Research Group, REGICOR Study Group, Hospital del Mar Research Institute (IMIM), Doctor Aiguader 88, 08003, Barcelona, Spain
- Spanish Biomedical Research Networking Centre (CIBER), Physiopathology of Obesity and Nutrition (CIBERobn), Instituto de Salud Carlos III, Madrid, Spain
| | - Sonia Gaixas
- Cardiovascular and Genetic Epidemiology Research Group, REGICOR Study Group, IMIM, Doctor Aiguader 88, 08003, Barcelona, Spain
| | - Rafael de la Torre
- Spanish Biomedical Research Networking Centre (CIBER), Physiopathology of Obesity and Nutrition (CIBERobn), Instituto de Salud Carlos III, Madrid, Spain
- Human Pharmacology and Clinical Neurosciences Research Group, IMIM, Doctor Aiguader 88, 08003, Barcelona, Spain
- Universitat Pompeu Fabra (CEXS-UPF), Barcelona, Spain
| | - Magí Farré
- Human Pharmacology and Clinical Neurosciences Research Group, IMIM, Doctor Aiguader 88, 08003, Barcelona, Spain
- Autonomous University of Barcelona, Barcelona, Spain
| | - Guillermo T Sáez
- Spanish Biomedical Research Networking Centre (CIBER), Physiopathology of Obesity and Nutrition (CIBERobn), Instituto de Salud Carlos III, Madrid, Spain
- Department of Biochemistry and Molecular Biology, Faculty of Medicine and Odontology, University of Valencia, Avinguda Blasco Ibañez 15, 46010, Valencia, Spain
| | - Kristina Nyyssönen
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio Campus, P.O.Box 1627, 70211, Joensuu, Finland
| | - Hans Joachim Zunft
- German Institute of Human Nutrition (DIFE), Potsdam-Rehbruecke, Arthur-Scheunert-Allee 114-116, 14558, Nuthetal, Germany
| | - Maria Isabel Covas
- Cardiovascular Risk and Nutrition Research Group, REGICOR Study Group, Hospital del Mar Research Institute (IMIM), Doctor Aiguader 88, 08003, Barcelona, Spain
- Spanish Biomedical Research Networking Centre (CIBER), Physiopathology of Obesity and Nutrition (CIBERobn), Instituto de Salud Carlos III, Madrid, Spain
| | - Montse Fitó
- Cardiovascular Risk and Nutrition Research Group, REGICOR Study Group, Hospital del Mar Research Institute (IMIM), Doctor Aiguader 88, 08003, Barcelona, Spain.
- Spanish Biomedical Research Networking Centre (CIBER), Physiopathology of Obesity and Nutrition (CIBERobn), Instituto de Salud Carlos III, Madrid, Spain.
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Emerging role of liver X receptors in cardiac pathophysiology and heart failure. Basic Res Cardiol 2015; 111:3. [PMID: 26611207 PMCID: PMC4661180 DOI: 10.1007/s00395-015-0520-7] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Accepted: 11/03/2015] [Indexed: 01/09/2023]
Abstract
Liver X receptors (LXRs) are master regulators of metabolism and have been studied for their pharmacological potential in vascular and metabolic disease. Besides their established role in metabolic homeostasis and disease, there is mounting evidence to suggest that LXRs may exert direct beneficial effects in the heart. Here, we aim to provide a conceptual framework to explain the broad mode of action of LXRs and how LXR signaling may be an important local and systemic target for the treatment of heart failure. We discuss the potential role of LXRs in systemic conditions associated with heart failure, such as hypertension, diabetes, and renal and vascular disease. Further, we expound on recent data that implicate a direct role for LXR activation in the heart, for its impact on cardiomyocyte damage and loss due to ischemia, and effects on cardiac hypertrophy, fibrosis, and myocardial metabolism. Taken together, the accumulating evidence supports the notion that LXRs may represent a novel therapeutic target for the treatment of heart failure.
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Cellular Cholesterol Accumulation Facilitates Ubiquitination and Lysosomal Degradation of Cell Surface–Resident ABCA1. Arterioscler Thromb Vasc Biol 2015; 35:1347-56. [DOI: 10.1161/atvbaha.114.305182] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Accepted: 03/24/2015] [Indexed: 11/16/2022]
Abstract
Objective—
By excreting cellular cholesterol to apolipoprotein A-I, ATP-binding cassette transporter A1 (ABCA1) mediates the biogenesis of high-density lipoprotein in hepatocytes and prevents foam cell formation from macrophages. We recently showed that cell surface–resident ABCA1 (csABCA1) undergoes ubiquitination and later lysosomal degradation through the endosomal sorting complex required for transport system. Herein, we investigated the relevance of this degradation pathway to the turnover of csABCA1 in hypercholesterolemia.
Approach and Results—
Immunoprecipitation and cell surface-biotinylation studies with HepG2 cells and mouse peritoneal macrophages showed that the ubiquitination level and degradation of csABCA1 were facilitated by treatment with a liver X receptor (LXR) agonist and acetylated low-density lipoprotein. The effects of an LXR agonist and acetylated low-density lipoprotein on the degradation of csABCA1 were repressed completely by treatment with bafilomycin, an inhibitor of lysosomal degradation, and by depletion of tumor susceptibility gene 101, a major component of endosomal sorting complex required for transport-I. RNAi analysis indicated that LXRβ inhibited the accelerated lysosomal degradation of csABCA1 by the LXR agonist, regardless of its transcriptional activity. Cell surface coimmunoprecipitation with COS1 cells expressing extracellularly hemagglutinin-tagged ABCA1 showed that LXRβ interacted with csABCA1 and inhibited the ubiquitination of csABCA1. Immunoprecipitates with anti-ABCA1 antibodies from the liver plasma membranes showed less LXRβ and a higher ubiquitination level of ABCA1 in high-fat diet–fed mice than in normal chow-fed mice.
Conclusions—
Under conditions of high cellular cholesterol content, csABCA1 became susceptible to ubiquitination by dissociation of LXRβ from csABCA1, which facilitated the lysosomal degradation of csABCA1 through the endosomal sorting complex required for transport system.
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Randles MJ, Woolf AS, Huang JL, Byron A, Humphries JD, Price KL, Kolatsi-Joannou M, Collinson S, Denny T, Knight D, Mironov A, Starborg T, Korstanje R, Humphries MJ, Long DA, Lennon R. Genetic Background is a Key Determinant of Glomerular Extracellular Matrix Composition and Organization. J Am Soc Nephrol 2015; 26:3021-34. [PMID: 25896609 DOI: 10.1681/asn.2014040419] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2014] [Accepted: 02/16/2015] [Indexed: 12/27/2022] Open
Abstract
Glomerular disease often features altered histologic patterns of extracellular matrix (ECM). Despite this, the potential complexities of the glomerular ECM in both health and disease are poorly understood. To explore whether genetic background and sex determine glomerular ECM composition, we investigated two mouse strains, FVB and B6, using RNA microarrays of isolated glomeruli combined with proteomic glomerular ECM analyses. These studies, undertaken in healthy young adult animals, revealed unique strain- and sex-dependent glomerular ECM signatures, which correlated with variations in levels of albuminuria and known predisposition to progressive nephropathy. Among the variation, we observed changes in netrin 4, fibroblast growth factor 2, tenascin C, collagen 1, meprin 1-α, and meprin 1-β. Differences in protein abundance were validated by quantitative immunohistochemistry and Western blot analysis, and the collective differences were not explained by mutations in known ECM or glomerular disease genes. Within the distinct signatures, we discovered a core set of structural ECM proteins that form multiple protein-protein interactions and are conserved from mouse to man. Furthermore, we found striking ultrastructural changes in glomerular basement membranes in FVB mice. Pathway analysis of merged transcriptomic and proteomic datasets identified potential ECM regulatory pathways involving inhibition of matrix metalloproteases, liver X receptor/retinoid X receptor, nuclear factor erythroid 2-related factor 2, notch, and cyclin-dependent kinase 5. These pathways may therefore alter ECM and confer susceptibility to disease.
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Affiliation(s)
- Michael J Randles
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, University of Manchester, Manchester, United Kingdom; Institute of Human Development, Faculty of Medical and Human Sciences, University of Manchester, Manchester, United Kingdom
| | - Adrian S Woolf
- Institute of Human Development, Faculty of Medical and Human Sciences, University of Manchester, Manchester, United Kingdom
| | - Jennifer L Huang
- Developmental Biology and Cancer Program, Institute of Child Health, University College London, London, United Kingdom
| | - Adam Byron
- Edinburgh Cancer Research United Kingdom Centre, Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, United Kingdom; and
| | - Jonathan D Humphries
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, University of Manchester, Manchester, United Kingdom
| | - Karen L Price
- Developmental Biology and Cancer Program, Institute of Child Health, University College London, London, United Kingdom
| | - Maria Kolatsi-Joannou
- Developmental Biology and Cancer Program, Institute of Child Health, University College London, London, United Kingdom
| | - Sophie Collinson
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, University of Manchester, Manchester, United Kingdom
| | - Thomas Denny
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, University of Manchester, Manchester, United Kingdom; Institute of Human Development, Faculty of Medical and Human Sciences, University of Manchester, Manchester, United Kingdom
| | - David Knight
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, University of Manchester, Manchester, United Kingdom
| | - Aleksandr Mironov
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, University of Manchester, Manchester, United Kingdom
| | - Toby Starborg
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, University of Manchester, Manchester, United Kingdom
| | | | - Martin J Humphries
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, University of Manchester, Manchester, United Kingdom
| | - David A Long
- Developmental Biology and Cancer Program, Institute of Child Health, University College London, London, United Kingdom
| | - Rachel Lennon
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, University of Manchester, Manchester, United Kingdom; Institute of Human Development, Faculty of Medical and Human Sciences, University of Manchester, Manchester, United Kingdom;
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Cannon MV, Yu H, Candido WM, Dokter MM, Lindstedt EL, Silljé HHW, van Gilst WH, de Boer RA. The liver X receptor agonist AZ876 protects against pathological cardiac hypertrophy and fibrosis without lipogenic side effects. Eur J Heart Fail 2015; 17:273-82. [PMID: 25684370 DOI: 10.1002/ejhf.243] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Revised: 01/07/2015] [Accepted: 01/08/2015] [Indexed: 11/07/2022] Open
Abstract
AIMS Liver X receptors (LXRs) transcriptionally regulate inflammation, metabolism, and immunity. Synthetic LXR agonists have been evaluated for their efficacy in the cardiovascular system; however, they elicit prolipogenic side effects which substantially limit their therapeutic use. AZ876 is a novel high-affinity LXR agonist. Herein, we aimed to determine the cardioprotective potential of LXR activation with AZ876. METHODS AND RESULTS Cardiac hypertrophy was induced in C57Bl6/J mice via transverse aortic constriction (TAC) for 6 weeks. During this period, mice received chow supplemented or not with AZ876 (20 µmol/kg/day). In murine hearts, LXRα protein expression was up-regulated ∼7-fold in response to TAC. LXR activation with AZ876 attenuated this increase, and significantly reduced TAC-induced increases in heart weight, myocardial fibrosis, and cardiac dysfunction without affecting blood pressure. At the molecular level, AZ876 suppressed up-regulation of hypertrophy- and fibrosis-related genes, and further inhibited prohypertrophic and profibrotic transforming growth factor β (TGFβ)-Smad2/3 signalling. In isolated cardiac myocytes and fibroblasts, immunocytochemistry confirmed nuclear expression of LXRα in both these cell types. In cardiomyocytes, phenylephrine-stimulated cellular hypertrophy was significantly decreased in AZ876-treated cells. In cardiac fibroblasts, AZ876 prevented TGFβ- and angiotensin II-induced fibroblast collagen synthesis, and inhibited up-regulation of the myofibroblastic marker, α-smooth muscle actin. Plasma triglycerides and liver weight were unaltered following AZ876 treatment. CONCLUSION AZ876 activation of LXR protects from adverse cardiac remodelling in pathological pressure overload, independently of blood pressure. LXR may thus represent a putative molecular target for antihypertrophic and antifibrotic therapies in heart failure prevention.
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Affiliation(s)
- Megan V Cannon
- University Medical Center Groningen, University of Groningen, Department of Cardiology, Groningen, The Netherlands
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Sparks MA, Crowley SD, Gurley SB, Mirotsou M, Coffman TM. Classical Renin-Angiotensin system in kidney physiology. Compr Physiol 2015; 4:1201-28. [PMID: 24944035 DOI: 10.1002/cphy.c130040] [Citation(s) in RCA: 353] [Impact Index Per Article: 39.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The renin-angiotensin system has powerful effects in control of the blood pressure and sodium homeostasis. These actions are coordinated through integrated actions in the kidney, cardiovascular system and the central nervous system. Along with its impact on blood pressure, the renin-angiotensin system also influences a range of processes from inflammation and immune responses to longevity. Here, we review the actions of the "classical" renin-angiotensin system, whereby the substrate protein angiotensinogen is processed in a two-step reaction by renin and angiotensin converting enzyme, resulting in the sequential generation of angiotensin I and angiotensin II, the major biologically active renin-angiotensin system peptide, which exerts its actions via type 1 and type 2 angiotensin receptors. In recent years, several new enzymes, peptides, and receptors related to the renin-angiotensin system have been identified, manifesting a complexity that was previously unappreciated. While the functions of these alternative pathways will be reviewed elsewhere in this journal, our focus here is on the physiological role of components of the "classical" renin-angiotensin system, with an emphasis on new developments and modern concepts.
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Affiliation(s)
- Matthew A Sparks
- Division of Nephrology, Department of Medicine, Duke University Medical Center, Durham, North Carolina
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Tanimoto K, Kanafusa S, Ushiki A, Matsuzaki H, Ishida J, Sugiyama F, Fukamizu A. A mouse renin distal enhancer is essential for blood pressure homeostasis in BAC-rescued renin-null mutant mice. J Recept Signal Transduct Res 2014; 34:401-9. [PMID: 24734888 DOI: 10.3109/10799893.2014.908917] [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: 01/24/2023]
Abstract
Renin is predominantly expressed in juxtaglomerular cells in the kidney and regulates blood pressure homeostasis. To examine possible in vivo functions of a mouse distal enhancer (mdE), we generated transgenic mice (TgM) carrying either wild-type or mdE-deficient renin BACs (bacterial artificial chromosome), integrated at the identical chromosomal site. In the kidneys of the TgM, the mdE contributed 80% to basal renin promoter activity. To test for possible physiological roles for the mdE, renin BAC transgenes were used to rescue the hypotensive renin-null mice. Interestingly, renal renin expression in the Tg(BAC):renin-null compound mice was indistinguishable between the wild-type and mutant BAC carriers. Surprisingly, however, the plasma renin activity and angiotensin I concentration in the mdE compound mutant mice were significantly lower than the same parameters in the control mice, and the mutants were consistently hypotensive, demonstrating that blood pressure homeostasis is regulated through transcriptional cis elements controlling renin activity.
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Affiliation(s)
- Keiji Tanimoto
- Faculty of Life and Environmental Sciences, University of Tsukuba , Tsukuba, Ibaraki , Japan
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31
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Patel M, Wang XX, Magomedova L, John R, Rasheed A, Santamaria H, Wang W, Tsai R, Qiu L, Orellana A, Advani A, Levi M, Cummins CL. Liver X receptors preserve renal glomerular integrity under normoglycaemia and in diabetes in mice. Diabetologia 2014; 57:435-46. [PMID: 24201575 DOI: 10.1007/s00125-013-3095-6] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Accepted: 10/01/2013] [Indexed: 10/26/2022]
Abstract
AIMS/HYPOTHESIS Liver X receptors (LXRs) α and β are nuclear hormone receptors that are widely expressed in the kidney. They promote cholesterol efflux from cells and inhibit inflammatory responses by regulating gene transcription. Here, we hypothesised (1) that LXR deficiency would promote renal decline in a mouse model of diabetes by accelerating intraglomerular cholesterol accumulation and, conversely, (2) that LXR agonism would attenuate renal decline in diabetes. METHODS Diabetes was induced with streptozotocin (STZ) and maintained for 14 weeks in Lxrα/β (+/+) (Lxrα, also known as Nr1h3; Lxrβ, also known as Nr1h2) and Lxrα/β (-/-) mice. In addition, STZ-injected DBA/2J mice were treated with vehicle or the LXR agonist N,N-dimethyl-hydroxycholenamide (DMHCA) (80 mg/kg daily) for 10 weeks. To determine the role of cholesterol in diabetic nephropathy (DN), mice were placed on a Western diet after hyperglycaemia developed. RESULTS Even in the absence of diabetes, Lxrα/β (-/-) mice exhibited a tenfold increase in the albumin:creatinine ratio and a 40-fold increase in glomerular lipid accumulation compared with Lxrα/β (+/+) mice. When challenged with diabetes, Lxrα/β (-/-) mice showed accelerated mesangial matrix expansion and glomerular lipid accumulation, with upregulation of inflammatory and oxidative stress markers. In the DN-sensitive STZ DBA/2J mouse model, DMHCA treatment significantly decreased albumin and nephrin excretion (by 50% each), glomerular lipids and plasma triacylglycerol (by 70%) and cholesterol (by 48%); it also decreased kidney inflammatory and oxidative stress markers compared with vehicle-treated mice. CONCLUSIONS/INTERPRETATION These data support the idea that LXR plays an important role in the normal and diabetic kidney, while showing that LXR, through its inhibitory effect on inflammation and cholesterol accumulation in glomeruli, could also be a novel therapeutic target for DN.
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Affiliation(s)
- Monika Patel
- Faculty of Pharmacy, University of Toronto, 144 College St, Toronto, ON, M5S 3M2, Canada
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Kuipers I, Li J, Vreeswijk-Baudoin I, Koster J, van der Harst P, Silljé HH, Kuipers F, van Veldhuisen DJ, van Gilst WH, de Boer RA. Activation of liver X receptors with T0901317 attenuates cardiac hypertrophyin vivo. Eur J Heart Fail 2014; 12:1042-50. [DOI: 10.1093/eurjhf/hfq109] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Irma Kuipers
- Department of Experimental Cardiology; University Medical Center Groningen; PO Box 30.001, 9700 RB Groningen The Netherlands
| | - Jiang Li
- Department of Experimental Cardiology; University Medical Center Groningen; PO Box 30.001, 9700 RB Groningen The Netherlands
| | - Inge Vreeswijk-Baudoin
- Department of Experimental Cardiology; University Medical Center Groningen; PO Box 30.001, 9700 RB Groningen The Netherlands
| | - Johan Koster
- Department of Experimental Cardiology; University Medical Center Groningen; PO Box 30.001, 9700 RB Groningen The Netherlands
| | - Pim van der Harst
- Department of Experimental Cardiology; University Medical Center Groningen; PO Box 30.001, 9700 RB Groningen The Netherlands
| | - Herman H.W. Silljé
- Department of Experimental Cardiology; University Medical Center Groningen; PO Box 30.001, 9700 RB Groningen The Netherlands
| | - Folkert Kuipers
- Department of Experimental Pediatrics; University Medical Center Groningen; Groningen The Netherlands
| | - Dirk J. van Veldhuisen
- Department of Experimental Cardiology; University Medical Center Groningen; PO Box 30.001, 9700 RB Groningen The Netherlands
| | - Wiek H. van Gilst
- Department of Experimental Cardiology; University Medical Center Groningen; PO Box 30.001, 9700 RB Groningen The Netherlands
| | - Rudolf A. de Boer
- Department of Experimental Cardiology; University Medical Center Groningen; PO Box 30.001, 9700 RB Groningen The Netherlands
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Zhou X, Fukuda N, Matsuda H, Endo M, Wang X, Saito K, Ueno T, Matsumoto T, Matsumoto K, Soma M, Kobayashi N, Nishiyama A. Complement 3 activates the renal renin-angiotensin system by induction of epithelial-to-mesenchymal transition of the nephrotubulus in mice. Am J Physiol Renal Physiol 2013; 305:F957-67. [PMID: 23926185 DOI: 10.1152/ajprenal.00344.2013] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
We have demonstrated that mesenchymal cells from spontaneously hypertensive rats genetically express complement 3 (C3). Mature tubular epithelial cells can undergo epithelial-to-mesenchymal transition (EMT) that is linked to the pathogenesis of renal fibrosis and injury. In this study, we investigated the contribution of C3 in EMT and in the renal renin-angiotensin (RA) systems associated with hypertension. C3a induced EMT in mouse TCMK-1 epithelial cells, which displayed increased expression of renin and Krüppel-like factor 5 (KLF5) and nuclear localization of liver X receptor α (LXRα). C3 and renin were strongly stained in the degenerated nephrotubulus and colocalized with LXRα and prorenin receptor in unilateral ureteral obstruction (UUO) kidneys from wild-type mice. In C3-deficient mice, hydronephrus and EMT were suppressed, with no expression of renin and C3. After UUO, systolic blood pressure was increased in wild-type but not C3-deficient mice. In wild-type mice, intrarenal angiotensin II (ANG II) levels were markedly higher in UUO kidneys than normal kidneys and decreased with aliskiren. There were no increases in intrarenal ANG II levels after UUO in C3-deficient mice. Thus C3 induces EMT and dedifferentiation of epithelial cells, which produce renin through induction of LXRα. These data indicate for the first time that C3 may be a primary factor to activate the renal RA systems to induce hypertension.
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Affiliation(s)
- Xueli Zhou
- Div. of Nephrology, Hypertension, and Endocrinology, Dept. of Medicine, Nihon Univ. School of Medicine, Tokyo 173-8610, Japan.
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Wang H, Gomez JA, Klein S, Zhang Z, Seidler B, Yang Y, Schmeckpeper J, Zhang L, Muramoto GG, Chute J, Pratt RE, Saur D, Mirotsou M, Dzau VJ. Adult renal mesenchymal stem cell-like cells contribute to juxtaglomerular cell recruitment. J Am Soc Nephrol 2013; 24:1263-73. [PMID: 23744888 DOI: 10.1681/asn.2012060596] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
The renin-angiotensin-aldosterone system (RAAS) regulates BP and salt-volume homeostasis. Juxtaglomerular (JG) cells synthesize and release renin, which is the first and rate-limiting step in the RAAS. Intense pathologic stresses cause a dramatic increase in the number of renin-producing cells in the kidney, termed JG cell recruitment, but how this occurs is not fully understood. Here, we isolated renal CD44(+) mesenchymal stem cell (MSC)-like cells and found that they differentiated into JG-like renin-expressing cells both in vitro and in vivo. Sodium depletion and captopril led to activation and differentiation of these cells into renin-expressing cells in the adult kidney. In summary, CD44(+) MSC-like cells exist in the adult kidney and can differentiate into JG-like renin-producing cells under conditions that promote JG cell recruitment.
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Affiliation(s)
- Hao Wang
- Mandel Center for Hypertension and Atherosclerosis Research and the Cardiovascular Research Center, Duke University Medical Center, Durham, NC 27710, USA
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Raksaseri P, Chatsudthipong V, Muanprasat C, Soodvilai S. Activation of liver X receptors reduces CFTR-mediated Cl(-) transport in kidney collecting duct cells. Am J Physiol Renal Physiol 2013; 305:F583-91. [PMID: 23720350 DOI: 10.1152/ajprenal.00579.2012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Liver X receptors (LXRs) are transcription factors belonging to the nuclear receptor super family, which act as regulators of lipid and glucose metabolism. However, LXRs have been shown to regulate the function of transporters in the kidney, including the Na-Pi cotransporter, organic anion transporter, and epithelial Na(+) channel. In this report, we demonstrated the ability of LXR ligands, both endogenous [22 (R)-hydroxycholesterol] and synthetic (T0901317 and GW3965), to reduce CFTR-mediated Cl(-) secretion in a type I Madin-Darby canine kidney (MDCK) cell line and in murine primary inner medullary collecting duct (IMCD) cells, based on measurements of [Arg(8)]-vasopressin-induced Cl(-) current. However, treatment of MDCK cell monolayers with 5 μM T0901317 for 24 h did not alter ouabain-senstive current or Na(+)-K(+)-ATPase-α protein content. Furthermore, basolateral membranes permeabilization of MDCK cell monolayers still resulted in a decrease in apical Cl(-) current stimulated by both [Arg(8)]-vasopressin and 8-cholorophenyl-thio-cAMP, indicating that the factor(s) encoded by the target gene(s) of agonist-activated LXRs might be located at the apical membrane. Western blot analysis revealed that inhibition of Cl(-) secretion occurred via a decrease in CFTR protein, which was not due to downregulation of its mRNA expression. In addition, both synthetic LXR agonists significantly retarded the growth of forskolin-induced cysts formed in MDCK cells cultured in collagen gel. This is the first evidence showing that ligand-activated LXRs are capable of downregulating CFTR-mediated Cl(-) secretion of kidney cells and of retarding cyst growth in a MDCK cell model.
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Affiliation(s)
- Promporn Raksaseri
- Dept. of Physiology, Faculty of Science, Mahidol Univ., Rama VI Road, Bangkok 10400, Thailand.
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Tiosano D, Gepstein V. Vitamin D action: lessons learned from hereditary 1,25-dihydroxyvitamin-D-resistant rickets patients. Curr Opin Endocrinol Diabetes Obes 2012; 19:452-9. [PMID: 23128575 DOI: 10.1097/med.0b013e32835a3415] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
PURPOSE OF REVIEW Hereditary 1,25-dihydroxyvitamin-D [1,25(OH)(2)D(3)]-resistant rickets (HVDRR) is a rare genetic disease caused by generalized resistance to 1,25(OH)(2)D(3). Less than 100 cases are reported in the literature. These patients provide an experiment by nature enabling us to understand the role of vitamin D, especially in light of the ongoing debate concerning normal vitamin D levels and the supplement dosage that should be recommended. This article summarizes the role of vitamin D in calcium absorption, rennin-angiotensin system (RAS), and cardiac state in HVDRR patients. RECENT FINDINGS The precise spectrum of vitamin D activities can now be better evaluated by critical analysis of mouse models with targeted deletion of the gene encoding the vitamin D receptor (VDR). Of special interest is the unraveling of the role of VDR in calcium absorption and cardiac status in VDR-knockout mice. The facts that VDR-knockout mice up-regulate intestinal calcium absorption and skeletal mineralization independently of the VDR during pregnancy and lactation point to the existence of VDR-independent mechanisms that are involved in calcium absorption. The observation that mice with genetic disruption of the 1α-hydroxylase gene or of the VDR gene have an overstimulated RAS and consequently develop high blood pressure and cardiac hypertrophy raised concern about potential risks to the cardiovascular system in HVDRR patients. SUMMARY The current review summarizes the new understanding of the effects of vitamin D on calcium absorption, the RAS, and heart hypertrophy derived from studying HVDRR patients from infancy to their mid-30s.
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Affiliation(s)
- Dov Tiosano
- Pediatric Endocrinology, Meyer Children's Hospital, Rambam Healthcare Campus, Haifa, Israel.
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Tachibana H, Ogawa D, Matsushita Y, Bruemmer D, Wada J, Teshigawara S, Eguchi J, Sato-Horiguchi C, Uchida HA, Shikata K, Makino H. Activation of liver X receptor inhibits osteopontin and ameliorates diabetic nephropathy. J Am Soc Nephrol 2012; 23:1835-46. [PMID: 23085633 DOI: 10.1681/asn.2012010022] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Osteopontin is a proinflammatory cytokine and monocyte chemoattractant implicated in the pathogenesis of diabetic nephropathy. Synthetic agonists for liver X receptors (LXRs) suppress the expression of proinflammatory genes, including osteopontin, but whether LXR activation modulates diabetic nephropathy is unknown. We administered the LXR agonist T0901317 to mice with streptozotocin-induced diabetes and evaluated its effects on diabetic nephropathy. The LXR agonist decreased urinary albumin excretion without altering blood glucose levels and substantially attenuated macrophage infiltration, mesangial matrix accumulation, and interstitial fibrosis. LXR activation suppressed the gene expression of inflammatory mediators, including osteopontin, in the kidney cortex. In vitro, LXR activation suppressed osteopontin expression in proximal tubular epithelial cells by inhibiting AP-1-dependent transcriptional activation of the osteopontin promoter. Taken together, these results suggest that inhibition of renal osteopontin by LXR agonists may have therapeutic potential for diabetic nephropathy.
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Affiliation(s)
- Hiromi Tachibana
- Department of Medicine and Clinical Science, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8558, Japan
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Soodvilai S, Jia Z, Fongsupa S, Chatsudthipong V, Yang T. Liver X receptor agonists decrease ENaC-mediated sodium transport in collecting duct cells. Am J Physiol Renal Physiol 2012; 303:F1610-6. [PMID: 23077096 DOI: 10.1152/ajprenal.00283.2012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Liver X receptors (LXRs) are nuclear receptors that regulate cholesterol, fatty acid, and glucose metabolism in various tissues. However, the renal action of LXRs is not well understood. Here we investigated the effects of LXR-activating ligands on modulation of epithelial sodium channel (ENaC)-mediated sodium transport in collecting duct cells. Exposure of the M1 cells to the synthetic LXR agonists T0901317 and GW3965 or the natural ligand 22R-hydroxycholesterol for 24 h decreased amiloride-sensitive sodium transport, corresponding with an increase of transepithelial resistance. The inhibition of amiloride-sensitive sodium transport after incubation with T0901317 or GW3965 was not mediated by a reduction of Na(+)/K(+)-ATPase-mediated basolateral sodium transport. On the other hand, T0901317 and GW3965 decreased mRNA abundance and membrane expression of ENaC. Preincubation the monolayer with GW3965 attenuated aldosterone-induced stimulation sodium transport. In primary cultures of collecting duct cells, T0901317 and GW3965 similarly inhibited ENaC transport function as in M1 cells. This is the first evidence showing LXR-activating ligands modulate ENaC-mediated sodium transport in collecting duct cells. These results suggest that LXRs may represent a novel therapeutic target for treatment of conditions with dysregulation of ENaC such as hypertension.
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Glenn ST, Jones CA, Gross KW, Pan L. Control of renin [corrected] gene expression. Pflugers Arch 2012; 465:13-21. [PMID: 22576577 DOI: 10.1007/s00424-012-1110-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2012] [Revised: 04/17/2012] [Accepted: 04/19/2012] [Indexed: 10/28/2022]
Abstract
Renin, as part of the renin-angiotensin system, plays a critical role in the regulation of blood pressure, electrolyte homeostasis, mammalian renal development, and progression of fibrotic/hypertrophic diseases. Renin gene transcription is subject to complex developmental and tissue-specific regulation. Initial studies using the mouse As4.1 cell line, which has many characteristics of the renin-expressing juxtaglomerular cells of the kidney, have identified a proximal promoter region (-197 to -50 bp) and an enhancer (-2,866 to -2,625 bp) upstream of the Ren-1(c) gene, which are critical for renin gene expression. The proximal promoter region contains several transcription factor binding sites including a binding site for the products of the developmental control genes Hox. The enhancer consists of at least 11 transcription factor binding sites and is responsive to various signal transduction pathways including cAMP, retinoic acid, endothelin-1, and cytokines, all of which are known to alter renin mRNA levels. Furthermore, in vivo models have validated several of these key components found within the proximal promoter region and the enhancer as well as other key sites necessary for renin gene transcription.
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Affiliation(s)
- Sean T Glenn
- Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Elm and Carlton Streets, Buffalo, NY 14263-0001, USA.
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Tovar-Palacio C, Torres N, Diaz-Villaseñor A, Tovar AR. The role of nuclear receptors in the kidney in obesity and metabolic syndrome. GENES AND NUTRITION 2012; 7:483-98. [PMID: 22532116 DOI: 10.1007/s12263-012-0295-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Accepted: 04/02/2012] [Indexed: 02/06/2023]
Abstract
Nuclear receptors are ligand-activated transcriptional regulators of several key aspects of renal physiology and pathophysiology. As such, nuclear receptors control a large variety of metabolic processes, including kidney lipid metabolism, drug clearance, inflammation, fibrosis, cell differentiation, and oxidative stress. Derangement of nuclear receptor regulation, that is, mainly due to obesity may induce metabolic syndrome, may contribute to the pathogenesis and progression of chronic renal disease and may result in end-stage renal disease. This places nuclear receptors at the forefront of novel therapeutic approaches for a broad range of kidney disorders and diseases, including glomerulosclerosis, tubulointerstitial disease, renal lipotoxicity, kidney fibrosis, and hypertension. This review focuses on the importance of the transcription factors peroxisome proliferator-activated receptor alpha, peroxisome proliferator-activated receptor beta, peroxisome proliferator-activated receptor gamma, liver X receptors, farnesoid X receptor, and the pregnane X receptor/steroid and xenobiotic receptor (PXR) on the physiology and pathophysiology of renal diseases associated with obesity and metabolic syndrome.
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Affiliation(s)
- Claudia Tovar-Palacio
- Department of Nephrology and Mineral Metabolism, National Medical Science and Nutrition Institute, Salvador Zubirán, Vasco de Quiroga No. 15, Tlalpan, 14000, Mexico, D.F., Mexico,
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Viennois E, Mouzat K, Dufour J, Morel L, Lobaccaro JM, Baron S. Selective liver X receptor modulators (SLiMs): what use in human health? Mol Cell Endocrinol 2012; 351:129-41. [PMID: 21907760 DOI: 10.1016/j.mce.2011.08.036] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2011] [Revised: 08/23/2011] [Accepted: 08/27/2011] [Indexed: 11/28/2022]
Abstract
Liver X receptors (LXR) are members of the nuclear receptor family. As activated transcription factors, their putative association with human diseases makes them promising pharmacological targets because of the large potential to develop ligands. LXR are mainly considered as intracellular cholesterol "sensors" whose activation leads to decreased plasma cholesterol. They also modulate numerous physiological functions: fatty acid synthesis and metabolism, glucose homeostasis, steroidogenesis, immunity, and neurological homeostasis. LXR-deficiency in mouse results in several phenotypes mimicking pathological conditions in humans. This review will be focused on the various natural and synthetic LXR agonists and antagonists. Putative clinical targets including atherosclerosis, diabetes, Alzheimer's disease, skin disorders, and cancer will be covered.
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Affiliation(s)
- Emilie Viennois
- Clermont Université, Université Blaise Pascal, Génétique Reproduction et Développement, BP 10448, F-63000 Clermont-Ferrand, France
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Abstract
The renin-angiotensin system (RAS) exercises fundamental control over sodium and water handling in the kidney. Accordingly, dysregulation of the RAS leads to blood pressure elevation with ensuing renal and cardiovascular damage. Recent studies have revealed that the RAS hormonal cascade is more complex than initially posited with multiple enzymes, effector molecules, and receptors that coordinately regulate the effects of the RAS on the kidney and vasculature. Moreover, recently identified tissue-specific RAS components have pleomorphic effects independent of the circulating RAS that influence critical homeostatic mechanisms including the immune response and fetal development. Further characterization of the diverse interactions between the RAS and other signaling pathways within specific tissues should lead to novel treatments for renal and cardiovascular disease.
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Central diabetes insipidus associated with impaired renal aquaporin-1 expression in mice lacking liver X receptor β. Proc Natl Acad Sci U S A 2012; 109:3030-4. [PMID: 22323586 DOI: 10.1073/pnas.1200588109] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The present study demonstrates a key role for the oxysterol receptor liver X receptor β (LXRβ) in the etiology of diabetes insipidus (DI). Given free access to water, LXRβ(-/-) but not LXRα(-/-) mice exhibited polyuria (abnormal daily excretion of highly diluted urine) and polydipsia (increased water intake), both features of diabetes insipidus. LXRβ(-/-) mice responded to 24-h dehydration with a decreased urine volume and increased urine osmolality. To determine whether the DI was of central or nephrogenic origin, we examined the responsiveness of the kidney to arginine vasopressin (AVP). An i.p. injection of AVP to LXRβ(-/-) mice revealed a partial kidney response: There was no effect on urine volume, but there was a significant increase of urine osmolality, suggesting that DI may be caused by a defect in central production of AVP. In the brain of WT mice LXRβ was expressed in the nuclei of magnocellular neurons in the supraoptic and paraventricular nuclei of the hypothalamus. In LXRβ(-/-) mice the expression of AVP was markedly decreased in the magnocellular neurons as well as in urine collected over a 24-h period. The persistent high urine volume after AVP administration was traced to a reduction in aquaporin-1 expression in the kidney of LXRβ(-/-) mice. The LXR agonist (GW3965) in WT mice elicited an increase in urine osmolality, suggesting that LXRβ is a key receptor in controlling water balance with targets in both the brain and kidney, and it could be a therapeutic target in disorders of water balance.
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Kittayaruksakul S, Soodvilai S, Asavapanumas N, Muanprasat C, Chatsudthipong V. Liver X receptor activation downregulates organic anion transporter 1 (OAT1) in the renal proximal tubule. Am J Physiol Renal Physiol 2011; 302:F552-60. [PMID: 22169006 DOI: 10.1152/ajprenal.00341.2011] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Liver X receptors (LXRs) play an important role in the regulation of cholesterol by regulating several transporters. In this study, we investigated the role of LXRs in the regulation of human organic anion transporter 1 (hOAT1), a major transporter localized in the basolateral membrane of the renal proximal tubule. Exposure of renal S2 cells expressing hOAT1 to LXR agonists (TO901317 and GW3965) and their endogenous ligand [22(R)-hydroxycholesterol] led to the inhibition of hOAT1-mediated [(14)C]PAH uptake. This inhibition was abolished by coincubation of the above agonists with 22(S)-hydroxycholesterol, an LXR antagonist. Moreover, it was found that the effect of LXR agonists was not mediated by changes in intracellular cholesterol levels. Interestingly, the inhibitory effect of LXRs was enhanced in the presence of 9-cis retinoic acid, a retinoic X receptor agonist. Kinetic analysis revealed that LXR activation decreased the maximum rate of PAH transport (J(max)) but had no effect on the affinity of the transporter (K(t)). This result correlated well with data from Western blot analysis, which showed the decrease in hOAT1 expression following LXR activation. Similarly, TO901317 inhibited [(14)C]PAH uptake by the renal cortical slices as well as decreasing mOAT1 protein expression in mouse kidney. Our findings indicated for the first time that hOAT1 was downregulated by LXR activation in the renal proximal tubule.
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Price ET, Pacanowski MA, Martin MA, Cooper-DeHoff RM, Pepine CJ, Zineh I, Johnson JA. Liver X receptor α gene polymorphisms and variable cardiovascular outcomes in patients treated with antihypertensive therapy: results from the INVEST-GENES study. Pharmacogenet Genomics 2011; 21:333-40. [PMID: 21562465 DOI: 10.1097/fpc.0b013e3283452fec] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND/AIMS Liver X receptor-α (LXRA) is a nuclear receptor that regulates genes important in cholesterol homeostasis and inflammation. Several single nucleotide polymorphisms (SNPs) in the LXRA gene (NR1H3) have been earlier associated with metabolic phenotypes (dyslipidemia and elevated body mass index). Metabolic dysregulation is a major contributor to coronary disease; therefore, we assessed LXRA in International Verapamil Sustained Release SR Trandolapril Study Genetic Substudy (INVEST-GENES), a genetic-substudy of a large clinical trial in patients with hypertension and coronary artery disease. METHODS Seven tag SNPs in the LXRA gene region (NR1H3) were selected for study: rs11039149, rs12221497, rs2279238, rs7120118, rs326213, rs11039159, and rs10501321. One thousand fifty-nine patients were genotyped from the INVEST-GENES case-control set (verapamil-sustained release-based or atenolol-based treatment strategies) that comprised of 297 cases frequency matched (approximately 2.5:1) with that of event-free controls by sex and race. The primary outcome was defined as first occurrence of all-cause death, nonfatal myocardial infarction, or nonfatal stroke. Adjusted odds ratios (ORs) were calculated using logistic regression. RESULTS Three of the seven SNPs were associated with significant effects on the primary outcome in nonBlacks. The variant G allele of rs11039149 and the variant A allele of rs12221497 were associated with reduced risk of experiencing the primary outcome [OR: 0.62, confidence interval (CI): 0.45-0.85, P=0.003 and OR: 0.60, CI: 0.39-0.91, P=0.016, respectively]. The rs2279238 genotype was associated with a significant increase in risk for the primary outcome (OR: 1.42, CI: 1.03-1.95, P=0.03). Furthermore, there was a significant genotype-treatment strategy interaction for carriers of the variant T allele of rs2279238 (OR for verapamil-sustained release strategy compared with atenolol strategy: 2.86, CI: 1.50-5.46, P=0.0015). Diplotype analyses showed that the SNPs are rarely coinherited and support the directionally opposite effects of the SNPs on the primary outcome. CONCLUSION LXRA genotypes were associated with variable risk for cardiovascular outcomes and pharmacogenetic effect in INVEST-GENES. These novel findings suggest that LXRA is a genetic/pharmacogenetic target that should be further explored.
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Affiliation(s)
- Elvin Tyrone Price
- Department of Pharmacotherapy and Translational Research and Center for Pharmacogenomics, University of Florida College of Medicine, Gainesville, FL, USA
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Liver X receptor α activation with the synthetic ligand T0901317 reduces lung injury and inflammation after hemorrhage and resuscitation via inhibition of the nuclear factor κB pathway. Shock 2011; 35:367-74. [PMID: 20926989 DOI: 10.1097/shk.0b013e3181f7d742] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Liver X receptor α (LXRα) is a nuclear transcription factor that regulates lipid metabolism. Recently, it has been shown that activation of LXRα with synthetic ligands has anti-inflammatory effects in atherosclerosis and chemical-induced dermatitis. We investigated the effect of the LXRα agonist, T0901317, on lung inflammation in a rodent model of hemorrhagic shock. Hemorrhagic shock was induced in male rats by withdrawing blood to a goal mean arterial blood pressure of 50 mmHg. Blood pressure was maintained at this level for 3 h, at which point rats were rapidly resuscitated with shed blood. Animals were then treated with T0901317 (50 mg · kg) or vehicle i.p. and sacrificed at 1, 2, and 3 h after resuscitation. Treatment with T0901317 significantly improved the cardiac and stroke volume indices as well as the heart rate of rats during the resuscitation period as compared with vehicle-treated rats. The T0901317-treated animals showed significant improvement in the plasma level of lactate, whereas base deficit and bicarbonate levels both trended toward improvement. The T0901317-treated animals also showed lower levels of plasma cytokines and chemokines monocyte chemoattractant protein 1, macrophage inflammatory protein 1α, TNF-α, KC, and IL-6. Lung injury and neutrophil infiltration were reduced by treatment with T0901317, as evaluated by histology and myeloperoxidase assay. At molecular analysis, treatment with T0901317 increased nuclear LXRα expression and DNA binding while also inhibiting activation of nuclear factor κB, a proinflammatory transcription factor, in the lung. Thus, our data suggest that LXRα is an important modulator of the inflammatory response and lung injury after severe hemorrhagic shock, likely through the inhibition of the nuclear factor κB pathway.
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Liver X receptor-activating ligands modulate renal and intestinal sodium-phosphate transporters. Kidney Int 2011; 80:535-44. [PMID: 21677638 DOI: 10.1038/ki.2011.159] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Cholesterol is pumped out of the cells in different tissues, including the vasculature, intestine, liver, and kidney, by the ATP-binding cassette transporters. Ligands that activate the liver X receptor (LXR) modulate this efflux. Here we determined the effects of LXR agonists on the regulation of phosphate transporters. Phosphate homeostasis is regulated by the coordinated action of the intestinal and renal sodium-phosphate (NaPi) transporters, and the loss of this regulation causes hyperphosphatemia. Mice treated with DMHCA or TO901317, two LXR agonists that prevent atherosclerosis in ApoE or LDLR knockout mice, significantly decreased the activity of intestinal and kidney proximal tubular brush border membrane sodium gradient-dependent phosphate uptake, decreased serum phosphate, and increased urine phosphate excretion. The effects of DMHCA were due to a significant decrease in the abundance of the intestinal and renal NaPi transport proteins. The same effect was also found in opossum kidney cells in culture after treatment with either agonist. There was increased nuclear expression of the endogenous LXR receptor, a reduction in NaPi4 protein abundance (the main type II NaPi transporter in the opossum cells), and a reduction in NaPi co-transport activity. Thus, LXR agonists modulate intestinal and renal NaPi transporters and, in turn, serum phosphate levels.
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Desch M, Harlander S, Neubauer B, Gerl M, Germain S, Castrop H, Todorov VT. cAMP target sequences enhCRE and CNRE sense low-salt intake to increase human renin gene expression in vivo. Pflugers Arch 2011; 461:567-77. [PMID: 21424707 DOI: 10.1007/s00424-011-0956-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2010] [Revised: 01/30/2011] [Accepted: 03/02/2011] [Indexed: 12/28/2022]
Abstract
This study aimed to assess the role of cAMP target sequences enhancer cAMP response element (enhCRE) and cAMP and overlapping negative response element (CNRE) in the control of human renin gene (REN) in vivo. enhCRE and CNRE were silenced by mutations in a 12.2-kb human renin promoter fused to LacZ reporter gene. This construct was used to generate transgenic mice (RENMut-LacZ). The expression of the transgene was correctly targeted to the juxtaglomerular portions of renal afferent arterioles which express endogenous mouse renin. Therefore, enhCRE and CNRE do not seem to be relevant for the control of the cell-specific expression of the human renin gene. The β-adrenoreceptor agonist isoproterenol (10 mg/kg/day, for 2 days) stimulated the endogenous renin, but not the LacZ mRNA expression. Treatment of RENMut-LacZ mice with the angiotensin converting enzyme inhibitor (enalapril 10 mg/kg/day, for 7 days) or their crossing to angiotensin receptor type 1a knockout mice led to increased renin and LacZ mRNA levels. Renin expression was upregulated by low-salt diet (0.03% NaCl, for 10 days) and downregulated by high-salt diet (4% NaCl, for 10 days). In contrast, low-salt diet did not influence, while high-salt diet inhibited the expression of LacZ. In summary, enhCRE and CNRE appear to be necessary for the transactivation of the human renin gene through β-adrenoreceptors and by low-salt diet. Our data also suggest that different intracellular mechanisms mediate the effect of low- and high-salt intake on renin expression in vivo.
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Affiliation(s)
- Michael Desch
- Institute of Physiology, University of Regensburg, 93040, Regensburg, Germany
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Ghemtio L, Devignes MD, Smaïl-Tabbone M, Souchet M, Leroux V, Maigret B. Comparison of three preprocessing filters efficiency in virtual screening: identification of new putative LXRbeta regulators as a test case. J Chem Inf Model 2010; 50:701-15. [PMID: 20420434 DOI: 10.1021/ci900356m] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
In silico screening methodologies are widely recognized as efficient approaches in early steps of drug discovery. However, in the virtual high-throughput screening (VHTS) context, where hit compounds are searched among millions of candidates, three-dimensional comparison techniques and knowledge discovery from databases should offer a better efficiency to finding novel drug leads than those of computationally expensive molecular dockings. Therefore, the present study aims at developing a filtering methodology to efficiently eliminate unsuitable compounds in VHTS process. Several filters are evaluated in this paper. The first two are structure-based and rely on either geometrical docking or pharmacophore depiction. The third filter is ligand-based and uses knowledge-based and fingerprint similarity techniques. These filtering methods were tested with the Liver X Receptor (LXR) as a target of therapeutic interest, as LXR is a key regulator in maintaining cholesterol homeostasis. The results show that the three considered filters are complementary so that their combination should generate consistent compound lists of potential hits.
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Affiliation(s)
- Léo Ghemtio
- Nancy Université, LORIA, Groupe ORPAILLEUR, Campus scientifique, BP 239, 54506 Vandoeuvre-les-Nancy Cedex, France.
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Kuipers I, van der Harst P, Kuipers F, van Genne L, Goris M, Lehtonen JY, van Veldhuisen DJ, van Gilst WH, de Boer RA. Activation of liver X receptor-alpha reduces activation of the renal and cardiac renin-angiotensin-aldosterone system. J Transl Med 2010; 90:630-6. [PMID: 20125084 DOI: 10.1038/labinvest.2010.7] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Liver X receptor (LXR)-alpha is a pivotal player in reverse cholesterol metabolism. Recently, LXR-alpha was implicated as an immediate regulator of renin expression in a cAMP-responsive manner. To determine whether long-term LXR-alpha activation affects activation of the renal and cardiac renin-angiotensin-aldosterone system (RAAS), we treated mice with T0901317 (T09, a specific synthetic LXR agonist) in combination with the RAAS inducer isoproterenol (ISO). LXR-alpha-deficient (LXR-alpha(-/-)) and wild-type (WT) C57Bl/6J mice were treated with ISO, T09 or both for 7 days. Low-dose ISO treatment, not associated with an increase in blood pressure, caused an increase in renal renin mRNA, renin protein and ACE protein in WT mice. WT mice treated with both ISO and T09 had decreased renal renin, ACE and AT(1)R mRNA expression compared with mice treated with ISO only. Cardiac ACE mRNA expression was also reduced in the hearts of WT mice treated with ISO and T09 compared with those treated with ISO alone. The transcriptional changes of renin, ACE and AT(1)R were mostly absent in mice deficient for LXR-alpha, suggesting that these effects are importantly conferred through LXR-alpha. In conclusion, LXR-alpha activation blunts ISO-induced increases in mRNA expression of renin, AT(1)R and ACE in the heart and kidney. These findings suggest a role for LXR-alpha in RAAS regulation.
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Affiliation(s)
- Irma Kuipers
- Department of Experimental Cardiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
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