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Afonso LG, Silva-Aguiar RP, Teixeira DE, Alves SAS, Schmaier AH, Pinheiro AAS, Peruchetti DB, Caruso-Neves C. The angiotensin II/type 1 angiotensin II receptor pathway is implicated in the dysfunction of albumin endocytosis in renal proximal tubule epithelial cells induced by high glucose levels. Biochim Biophys Acta Gen Subj 2024; 1868:130684. [PMID: 39084330 DOI: 10.1016/j.bbagen.2024.130684] [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: 04/18/2024] [Revised: 07/09/2024] [Accepted: 07/25/2024] [Indexed: 08/02/2024]
Abstract
It is well-established that dysfunction of megalin-mediated albumin endocytosis by proximal tubule epithelial cells (PTECs) and the activation of the Renin-Angiotensin System (RAS) play significant roles in the development of Diabetic Kidney Disease (DKD). However, the precise correlation between these factors still requires further investigation. In this study, we aimed to elucidate the potential role of angiotensin II (Ang II), a known effector of RAS, as the mediator of albumin endocytosis dysfunction induced by high glucose (HG) in PTECs. To achieve this, we utilized LLC-PK1 and HK-2 cells, which are well-established in vitro models of PTECs. Using albumin-FITC or DQ-albumin as tracers, we observed that incubation of LLC-PK1 and HK-2 cells with HG (25 mM for 48 h) significantly reduced canonical receptor-mediated albumin endocytosis, primarily due to the decrease in megalin expression. HG increased the concentration of Ang II in the LLC-PK1 cell supernatant, a phenomenon associated with an increase in angiotensin-converting enzyme (ACE) expression and a decrease in prolyl carboxypeptidase (PRCP) expression. ACE type 2 (ACE2) expression remained unchanged. To investigate the potential impact of Ang II on HG effects, the cells were co-incubated with angiotensin receptor inhibitors. Only co-incubation with 10-7 M losartan (an antagonist for type 1 angiotensin receptor, AT1R) attenuated the inhibitory effect of HG on albumin endocytosis, as well as megalin expression. Our findings contribute to understanding the genesis of tubular albuminuria observed in the early stages of DKD, which involves the activation of the Ang II/AT1R axis by HG.
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Affiliation(s)
- Liz G Afonso
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Rodrigo P Silva-Aguiar
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Douglas E Teixeira
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Sarah A S Alves
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Alvin H Schmaier
- Department of Medicine, Division of Hematology and Cell Therapy, Case Western Reserve University and University Hospitals Cleveland Medical Center, Cleaveland, USA
| | - Ana Acacia S Pinheiro
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil; Rio de Janeiro Innovation Network in Nanosystems for Health - NanoSAUDE/FAPERJ, Rio de Janeiro, Brazil
| | - Diogo B Peruchetti
- Departamento de Fisiologia e Biofísica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil; Instituto Nacional de Ciência e Tecnologia em Nanofarmacêutica, INCT-NANOBiofar, CNPq/MCTI, Belo Horizonte, Brazil
| | - Celso Caruso-Neves
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil; Rio de Janeiro Innovation Network in Nanosystems for Health - NanoSAUDE/FAPERJ, Rio de Janeiro, Brazil; Instituto Nacional de Ciência e Tecnologia em Medicina Regenerativa, INCT-Regenera, CNPq/MCTI, Rio de Janeiro, Brazil.
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2
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Jantaravinid J, Tirawanchai N, Ampawong S, Kengkoom K, Somkasetrin A, Nakhonsri V, Aramwit P. Transcriptomic screening of novel targets of sericin in human hepatocellular carcinoma cells. Sci Rep 2024; 14:5455. [PMID: 38443583 PMCID: PMC10914811 DOI: 10.1038/s41598-024-56179-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Accepted: 03/03/2024] [Indexed: 03/07/2024] Open
Abstract
Sericin, a natural protein derived from Bombyx mori, is known to ameliorate liver tissue damage; however, its molecular mechanism remains unclear. Herein, we aimed to identify the possible novel targets of sericin in hepatocytes and related cellular pathways. RNA sequencing analysis indicated that a low dose of sericin resulted in 18 differentially expressed genes (DEGs) being upregulated and 68 DEGs being downregulated, while 61 DEGs were upregulated and 265 DEGs were downregulated in response to a high dose of sericin (FDR ≤ 0.05, fold change > 1.50). Functional analysis revealed that a low dose of sericin regulated pathways associated with the complement and coagulation cascade, metallothionine, and histone demethylate (HDMs), whereas a high dose of sericin was associated with pathways involved in lipid metabolism, mitogen-activated protein kinase (MAPK) signaling and autophagy. The gene network analysis highlighted twelve genes, A2M, SERPINA5, MT2A, MT1G, MT1E, ARID5B, POU2F1, APOB, TRAF6, HSPA8, FGFR1, and OGT, as novel targets of sericin. Network analysis of transcription factor activity revealed that sericin affects NFE2L2, TFAP2C, STAT1, GATA3, CREB1 and CEBPA. Additionally, the protective effects of sericin depended on the counterregulation of APOB, POU2F1, OGT, TRAF6, and HSPA5. These findings suggest that sericin exerts hepatoprotective effects through diverse pathways at different doses, providing novel potential targets for the treatment of liver diseases.
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Affiliation(s)
- Jiraporn Jantaravinid
- Center of Excellence in Bioactive Resources for Innovative Clinical Applications, Department of Pharmacy Practice, Faculty of Pharmaceutical Sciences, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok, 10330, Thailand
| | - Napatara Tirawanchai
- Department of Biochemistry, Faculty of Medicine Siriraj Hospital, Mahidol University, 2, Wanglang Road, Bangkoknoi, Bangkok, 10700, Thailand
| | - Sumate Ampawong
- Department of Tropical Pathology, Faculty of Tropical Medicine, Mahidol University, 420/6, Ratchawithi Road, Ratchathewi, Bangkok, 10400, Thailand
| | - Kanchana Kengkoom
- Research and Academic Support Office, National Laboratory Animal Center, Mahidol University, 999, Salaya, Puttamonthon, Nakorn Pathom, 73170, Thailand
| | - Anchaleekorn Somkasetrin
- Department of Biochemistry, Faculty of Medicine Siriraj Hospital, Mahidol University, 2, Wanglang Road, Bangkoknoi, Bangkok, 10700, Thailand
| | - Vorthunju Nakhonsri
- National Biobank of Thailand (NBT), National Science and Technology Development Agency (NSTDA), 144 Innovation Cluster 2 Building (INC) Tower A, Thailand Science Park, Khlong Nueng, Khlong Luang District, Pathum Thani, 12120, Thailand
| | - Pornanong Aramwit
- Center of Excellence in Bioactive Resources for Innovative Clinical Applications, Department of Pharmacy Practice, Faculty of Pharmaceutical Sciences, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok, 10330, Thailand.
- The Academy of Science, The Royal Society of Thailand, Dusit, Bangkok, 10330, Thailand.
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3
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Xie Y, Li X, Deng W, Nan N, Zou H, Gong L, Chen M, Yu J, Chen P, Cui D, Zhang F. Knockdown of USF2 inhibits pyroptosis of podocytes and attenuates kidney injury in lupus nephritis. J Mol Histol 2023; 54:313-327. [PMID: 37341818 DOI: 10.1007/s10735-023-10135-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 06/11/2023] [Indexed: 06/22/2023]
Abstract
As an essential factor in the prognosis of Systemic lupus erythematosus (SLE), lupus nephritis (LN) can accelerate the rate at which patients with SLE can transition to chronic kidney disease or even end-stage renal disease (ESRD). Proteinuria due to decreased glomerular filtration rate following podocyte injury is LN's most common clinical manifestation. Podocyte pyroptosis and related inflammatory factors in its process can promote lupus to involve kidney cells and worsen the occurrence and progression of LN, but its regulatory mechanism remains unknown. Accumulating evidence has shown that upstream stimulatory factor 2 (USF2) plays a vital role in the pathophysiology of kidney diseases. In this research, multiple experiments were performed to investigate the role of USF2 in the process of LN. USF2 was abnormally highly expressed in MRL/lpr mice kidney tissues. Renal function impairment and USF2 mRNA levels were positively correlated. Silencing of USF2 in MRL/lpr serum-stimulated cells significantly reduced serum-induced podocyte pyroptosis. USF2 enhanced NLRP3 expression at the transcriptional level. Silencing of USF2 in vivo attenuated kidney injury in MRL/lpr mice, which suggests that USF2 is important for LN development and occurrence.
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Affiliation(s)
- Ying Xie
- Department of Pathophysiology, Guizhou Medical University, Guiyang, 550025, China
- Guizhou Provincial Key Laboratory of Pathogenesis and Drug Research on Common Chronic Diseases, Guizhou Medical University, Guiyang, 550025, China
| | - Xiaoying Li
- Department of Nephrology, The First People's Hospital of Guiyang, Guiyang, 550002, China
| | - Wenli Deng
- Department of Nephrology, The First People's Hospital of Guiyang, Guiyang, 550002, China
| | - Nan Nan
- Department of Pathology, The First People's Hospital of Guiyang, Guiyang, 550002, China
| | - Huimei Zou
- Department of Pathophysiology, Guizhou Medical University, Guiyang, 550025, China
- Guizhou Provincial Key Laboratory of Pathogenesis and Drug Research on Common Chronic Diseases, Guizhou Medical University, Guiyang, 550025, China
- School of Nursing, Guizhou Medical University, Guiyang, 550025, China
| | - Lei Gong
- Department of Basic Medicine, Qujing Medical College, Qujing, 655000, China
| | - Min Chen
- Department of Pathophysiology, Guizhou Medical University, Guiyang, 550025, China
- Guizhou Provincial Key Laboratory of Pathogenesis and Drug Research on Common Chronic Diseases, Guizhou Medical University, Guiyang, 550025, China
| | - Jie Yu
- Department of Pathophysiology, Guizhou Medical University, Guiyang, 550025, China
- Guizhou Provincial Key Laboratory of Pathogenesis and Drug Research on Common Chronic Diseases, Guizhou Medical University, Guiyang, 550025, China
| | - Peilei Chen
- Department of Pathophysiology, Guizhou Medical University, Guiyang, 550025, China
- Guizhou Provincial Key Laboratory of Pathogenesis and Drug Research on Common Chronic Diseases, Guizhou Medical University, Guiyang, 550025, China
| | - Daolin Cui
- Department of Basic Medicine, Qujing Medical College, Qujing, 655000, China.
| | - Fan Zhang
- Department of Pathophysiology, Guizhou Medical University, Guiyang, 550025, China.
- Guizhou Provincial Key Laboratory of Pathogenesis and Drug Research on Common Chronic Diseases, Guizhou Medical University, Guiyang, 550025, China.
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LncRNA TTN-AS1 exacerbates extracellular matrix accumulation via miR-493-3p/FOXP2 axis in diabetic nephropathy. J Genet 2022. [DOI: 10.1007/s12041-022-01397-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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5
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Haruhara K, Suzuki T, Wakui H, Azushima K, Kurotaki D, Kawase W, Uneda K, Kobayashi R, Ohki K, Kinguchi S, Yamaji T, Kato I, Ohashi K, Yamashita A, Tamura T, Tsuboi N, Yokoo T, Tamura K. Deficiency of the kidney tubular angiotensin II type1 receptor-associated protein ATRAP exacerbates streptozotocin-induced diabetic glomerular injury via reducing protective macrophage polarization. Kidney Int 2022; 101:912-928. [PMID: 35240129 DOI: 10.1016/j.kint.2022.01.031] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2021] [Revised: 12/22/2021] [Accepted: 01/11/2022] [Indexed: 12/13/2022]
Abstract
Although activation of the renin-angiotensin system and of its glomerular components is implicated in the pathogenesis of diabetic nephropathy, the functional roles of the tubular renin-angiotensin system with AT1 receptor signaling in diabetic nephropathy are unclear. Tissue hyperactivity of the renin-angiotensin system is inhibited by the angiotensin II type 1 receptor-associated protein ATRAP, which negatively regulates receptor signaling. The highest expression of endogenous ATRAP occurs in the kidney, where it is mainly expressed by tubules but rarely in glomeruli. Here, we found that hyperactivation of angiotensin II type 1 receptor signaling in kidney tubules exacerbated diabetic glomerular injury in a mouse model of streptozotocin-induced diabetic nephropathy. These phenomena were accompanied by decreased expression of CD206, a marker of alternatively activated and tissue-reparative M2 macrophages, in the kidney tubulointerstitium. Additionally, adoptive transfer of M2- polarized macrophages into diabetic ATRAP-knockout mice ameliorated the glomerular injury. As a possible mechanism, the glomerular mRNA levels of tumor necrosis factor-α and oxidative stress components were increased in diabetic knockout mice compared to non-diabetic knockout mice, but these increases were ameliorated by adoptive transfer. Furthermore, proximal tubule-specific ATRAP downregulation reduced tubulointerstitial expression of CD206, the marker of M2 macrophages in diabetic mice. Thus, our findings indicate that tubular ATRAP-mediated functional modulation of angiotensin II type 1 receptor signaling modulates the accumulation of tubulointerstitial M2 macrophages, thus affecting glomerular manifestations of diabetic nephropathy via tubule-glomerular crosstalk.
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Affiliation(s)
- Kotaro Haruhara
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, Yokohama, Japan; Division of Nephrology and Hypertension, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan
| | - Toru Suzuki
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Hiromichi Wakui
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, Yokohama, Japan.
| | - Kengo Azushima
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, Yokohama, Japan.
| | - Daisuke Kurotaki
- Department of Immunology, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Wataru Kawase
- Department of Immunology, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Kazushi Uneda
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Ryu Kobayashi
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Kohji Ohki
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Sho Kinguchi
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Takahiro Yamaji
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, Yokohama, Japan; Cardiovascular and Metabolic Disorders Program, Duke-NUS Medical School, Singapore
| | - Ikuma Kato
- Department of Molecular Pathology, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Kenichi Ohashi
- Department of Pathology, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Akio Yamashita
- Department of Molecular Biology, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Tomohiko Tamura
- Department of Immunology, Yokohama City University Graduate School of Medicine, Yokohama, Japan; Advanced Medical Research Center, Yokohama City University, Yokohama, Japan
| | - Nobuo Tsuboi
- Division of Nephrology and Hypertension, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan
| | - Takashi Yokoo
- Division of Nephrology and Hypertension, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan
| | - Kouichi Tamura
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, Yokohama, Japan.
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Faria J, Gerritsen KGF, Nguyen TQ, Mihaila SM, Masereeuw R. Diabetic proximal tubulopathy: Can we mimic the disease for in vitro screening of SGLT inhibitors? Eur J Pharmacol 2021; 908:174378. [PMID: 34303664 DOI: 10.1016/j.ejphar.2021.174378] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 07/15/2021] [Accepted: 07/21/2021] [Indexed: 11/27/2022]
Abstract
Diabetic kidney disease (DKD) is the foremost cause of renal failure. While the glomeruli are severely affected in the course of the disease, the main determinant for disease progression is the tubulointerstitial compartment. DKD does not develop in the absence of hyperglycemia. Since the proximal tubule is the major player in glucose reabsorption, it has been widely studied as a therapeutic target for the development of new therapies. Currently, there are several proximal tubule cell lines available, being the human kidney-2 (HK-2) and human kidney clone-8 (HKC-8) cell lines the ones widely used for studying mechanisms of DKD. Studies in these models have pushed forward the understanding on how DKD unravels, however, these cell culture models possess limitations that hamper research, including lack of transporters and dedifferentiation. The sodium-glucose cotransporters (SGLT) are identified as key players in glucose reabsorption and pharmacological inhibitors have shown to be beneficial for the long-term clinical outcome in DKD. However, their mechanism of action has, as of yet, not been fully elucidated. To comprehend the protective effects of SGLT inhibitors, it is essential to understand the complete functional, structural, and molecular features of the disease, which until now have been difficult to recapitulate. This review addresses the molecular events of diabetic proximal tubulopathy. In addition, we evaluate the protective role of SGLT inhibitors in cardiovascular and renal outcomes, and provide an overview of various in vitro models mimicking diabetic proximal tubulopathy used so far. Finally, new insights on advanced in vitro systems to surpass past limitations are postulated.
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Affiliation(s)
- João Faria
- Div. Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, the Netherlands
| | - Karin G F Gerritsen
- Dept. Nephrology and Hypertension, University Medical Center Utrecht, the Netherlands
| | - Tri Q Nguyen
- Dept. Pathology, University Medical Center Utrecht, the Netherlands
| | - Silvia M Mihaila
- Div. Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, the Netherlands; Dept. Nephrology and Hypertension, University Medical Center Utrecht, the Netherlands
| | - Rosalinde Masereeuw
- Div. Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, the Netherlands.
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7
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Wang L, Wang Z, Yang Z, Yang K, Yang H. Study of the Active Components and Molecular Mechanism of Tripterygium wilfordii in the Treatment of Diabetic Nephropathy. Front Mol Biosci 2021; 8:664416. [PMID: 34164430 PMCID: PMC8215273 DOI: 10.3389/fmolb.2021.664416] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Accepted: 05/20/2021] [Indexed: 12/19/2022] Open
Abstract
We aimed to explore the active ingredients and molecular mechanism of Tripterygium wilfordii (TW) in the treatment of diabetic nephropathy (DN) through network pharmacology and molecular biology. First, the active ingredients and potential targets of TW were obtained through the Traditional Chinese Medicine Systems Pharmacology Database and Analysis Platform (TCMSP) and related literature materials, and Cytoscape 3.7.2 software was used to construct the active ingredient-target network diagram of TW. Second, the target set of DN was obtained through the disease database, and the potential targets of TW in the treatment of DN were screened through a Venn diagram. A protein interaction network diagram (PPI) was constructed with the help of the String platform and Cytoscape 3.7.2. Third, the ClueGO plug-in tool was used to enrich the GO biological process and the KEGG metabolic pathway. Finally, molecular docking experiments and cell pathway analyses were performed. As a result, a total of 52 active ingredients of TW were screened, and 141 predicted targets and 49 target genes related to DN were identified. The biological process of GO is mediated mainly through the regulation of oxygen metabolism, endothelial cell proliferation, acute inflammation, apoptotic signal transduction pathway, fibroblast proliferation, positive regulation of cyclase activity, adipocyte differentiation and other biological processes. KEGG enrichment analysis showed that the main pathways involved were AGE-RAGE, vascular endothelial growth factor, HIF-1, IL-17, relaxin signalling pathway, TNF, Fc epsilon RI, insulin resistance and other signaling pathways. It can be concluded that TW may treat DN by reducing inflammation, reducing antioxidative stress, regulating immunity, improving vascular disease, reducing insulin resistance, delaying renal fibrosis, repairing podocytes, and reducing cell apoptosis, among others, with multicomponent, multitarget and multisystem characteristics.
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Affiliation(s)
- Lin Wang
- Graduate School, First Affiliated Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Zheyi Wang
- Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, China
| | - Zhihua Yang
- Graduate School, First Affiliated Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Kang Yang
- Graduate School, First Affiliated Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Hongtao Yang
- Graduate School, First Affiliated Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin, China
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8
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Sanajou D, Bahrambeigi S, Aslani S. β-LAPachone is renoprotective in streptozotocin-induced diabetic mice via regulating the PI3K/Akt/mTOR signaling pathway. IRANIAN JOURNAL OF BASIC MEDICAL SCIENCES 2021; 24:650-656. [PMID: 34249267 PMCID: PMC8244603 DOI: 10.22038/ijbms.2021.55565.12422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Accepted: 03/13/2021] [Indexed: 11/16/2022]
Abstract
OBJECTIVES β-LAPachone (B-LAP) is a natural product with established anti-inflammatory properties. In this study, we investigated the protective potential of B-LAP against diabetic nephropathy in streptozotocin (STZ) induced diabetic mice. MATERIALS AND METHODS Diabetes induction in mice was carried out by a single intraperitoneal injection of STZ. 2.5 mg/kg/day and 5 mg/kg/day doses of B-LAP were administered orally for twelve weeks and renal histoarchitecture, caspase-3, tumor necrosis factor-alpha (TNF-α), malondialdehyde (MDA), glutathione peroxidase (GPX), as well as urinary nephrin and neutrophil gelatinase-associated lipocalin (NGAL) were evaluated. Additionally, kidney levels of PI3K, phosphorylated (p)-Akt, p-mTOR, p-CREB, and SIRT1 were assessed in the present investigation. RESULTS 5 mg/kg B-LAP significantly decreased urinary excretions of nephrin and NGAL. It also mitigated renal TNF-α and MDA levels and simultaneously improved GPX activities. 5 mg/kg B-LAP improved renal function in diabetic mice as indicated by elevated values of creatinine clearance. While B-LAP elevated renal levels of SIRT1, it alleviated PI3K, p-Akt, p-mTOR, and p-CREB levels in the kidneys of diabetic mice. CONCLUSION Collectively, these findings suggest B-LAP as a potential renoprotective agent in STZ-induced diabetic mice probably via modulating the PI3K/Akt/mTOR pathway.
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Affiliation(s)
- Davoud Sanajou
- Department of Biochemistry, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Saman Bahrambeigi
- Department of Biochemistry, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Somayeh Aslani
- Department of Biochemistry, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
- Department of Biochemistry, School of Medicine, Hamedan University of Medical Sciences, Hamedan, Iran
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9
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Hou Y, Zhang Y, Lin S, Yu Y, Yang L, Li L, Wang W. Protective mechanism of apigenin in diabetic nephropathy is related to its regulation of miR-423-5P-USF2 axis. Am J Transl Res 2021; 13:2006-2020. [PMID: 34017372 PMCID: PMC8129299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Accepted: 01/04/2021] [Indexed: 06/12/2023]
Abstract
Apigenin (APG), a natural flavonoid with anti-inflammatory and anti-fibrosis properties, has been shown to play a protective role in diabetic nephropathy (DN), but their molecular protection mechanism for miRNA has not been elucidated in detail. This study was designed to focus on exploring its protective role in DN and whether miR-423-5p-upstream stimulating factor 2 (USF2) axis was involved in its protective mechanism. The in vivo model of rat was induced by streptozotocin (STZ) and the in vitro model of renal tubular epithelial cell (RTEC) was induced by high glucose (HG). Our in vivo study revealed that APG had different protective effects on inflammation, renal fibrosis and epithelial mesenchymal transition (EMT) in DN rats, which is mainly reflected in that the inflammatory factors (IL-6, IFN-γ, TNF-α) were obviously down-regulated, the renal fibrosis markers (IV-C, FN, Col I) were significantly inhibited, the E-cadherin (EMT factors) was significantly up-regulated, while the vimentin and α-SMA (EMT factors) were significantly down-regulated, and the renal function indexes (serum Cr, BUN) were significantly improved. In terms of mechanism, the protective effect of APG was related to the regulation of the expression of miR-423-5p-USF2 axis, and there was a targeted relationship between miR-423-5p and USF2. Down-regulating miR-423-5p or up-regulating USF2 could significantly aggravate the disease progression of in vitro model and eliminate DN resistance under APG intervention. The above results revealed that the protective role of APG on DN was mediated by miR-423-5p-USF2 axis.
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Affiliation(s)
- Yi Hou
- Department of Urology, China-Japan Union Hospital of Jilin UniversityChangchun 130033, Jilin, P. R. China
| | - Yan Zhang
- Department of Endocrinology, China-Japan Union Hospital of Jilin UniversityChangchun 130033, Jilin, P. R. China
| | - Sitong Lin
- Department of Endocrinology, China-Japan Union Hospital of Jilin UniversityChangchun 130033, Jilin, P. R. China
| | - Yue Yu
- Department of Endocrinology, China-Japan Union Hospital of Jilin UniversityChangchun 130033, Jilin, P. R. China
| | - Liu Yang
- Department of Endocrinology, China-Japan Union Hospital of Jilin UniversityChangchun 130033, Jilin, P. R. China
| | - Lei Li
- Department of Urology, China-Japan Union Hospital of Jilin UniversityChangchun 130033, Jilin, P. R. China
| | - Wenxiang Wang
- Department of Urology, China-Japan Union Hospital of Jilin UniversityChangchun 130033, Jilin, P. R. China
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10
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Benchoula K, Parhar IS, Madhavan P, Hwa WE. CREB nuclear transcription activity as a targeting factor in the treatment of diabetes and diabetes complications. Biochem Pharmacol 2021; 188:114531. [PMID: 33773975 DOI: 10.1016/j.bcp.2021.114531] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 03/09/2021] [Accepted: 03/17/2021] [Indexed: 02/06/2023]
Abstract
Diabetes mellitus is a metabolic disorder diagnosed by elevated blood glucose levels and a defect in insulin production. Blood glucose, an energy source in the body, is regenerated by two fundamental processes: glycolysis and gluconeogenesis. These two processes are the main mechanisms used by humans and many other animals to maintain blood glucose levels, thereby avoiding hypoglycaemia. The released insulin from pancreatic β-cells activates glycolysis. However, the glucagon released from the pancreatic α-cells activates gluconeogenesis in the liver, leading to pyruvate conversion to glucose-6-phosphate by different enzymes such as fructose 1,6-bisphosphatase and glucose 6-phosphatase. These enzymes' expression is controlled by the glucagon/ cyclic adenosine 3',5'-monophosphate (cAMP)/ proteinkinase A (PKA) pathway. This pathway phosphorylates cAMP-response element-binding protein (CREB) in the nucleus to bind it to these enzyme promoters and activate their expression. During fasting, this process is activated to supply the body with glucose; however, it is overactivated in diabetes. Thus, the inhibition of this process by blocking the expression of the enzymes via CREB is an alternative strategy for the treatment of diabetes. This review was designed to investigate the association between CREB activity and the treatment of diabetes and diabetes complications. The phosphorylation of CREB is a crucial step in regulating the gene expression of the enzymes of gluconeogenesis. Many studies have proven that CREB is over-activated by glucagon and many other factors contributing to the elevation of fasting glucose levels in people with diabetes. The physiological function of CREB should be regarded in developing a therapeutic strategy for the treatment of diabetes mellitus and its complications. However, the accessible laboratory findings for CREB activity of the previous research still not strong enough for continuing to the clinical trial yet.
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Affiliation(s)
- Khaled Benchoula
- School of Medicine, Faculty of Health and Medical Sciences, Taylor's University, 1, Jalan Taylors, 47500 Subang Jaya, Selangor, Malaysia
| | - Ishwar S Parhar
- Monash University (Malaysia) BRIMS, Jeffrey Cheah School of Medicine & Health Sciences, Jalan Lagoon Selatan, Bandar Sunway, 47500 Subang Jaya, Selangor, Malaysia
| | - Priya Madhavan
- School of Medicine, Faculty of Health and Medical Sciences, Taylor's University, 1, Jalan Taylors, 47500 Subang Jaya, Selangor, Malaysia
| | - Wong Eng Hwa
- School of Medicine, Faculty of Health and Medical Sciences, Taylor's University, 1, Jalan Taylors, 47500 Subang Jaya, Selangor, Malaysia.
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11
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Salti T, Khazim K, Haddad R, Campisi-Pinto S, Bar-Sela G, Cohen I. Glucose Induces IL-1α-Dependent Inflammation and Extracellular Matrix Proteins Expression and Deposition in Renal Tubular Epithelial Cells in Diabetic Kidney Disease. Front Immunol 2020; 11:1270. [PMID: 32733443 PMCID: PMC7358427 DOI: 10.3389/fimmu.2020.01270] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2019] [Accepted: 05/19/2020] [Indexed: 12/13/2022] Open
Abstract
Diabetes mellitus is linked with metabolic stress that induces cellular damage and can provoke renal inflammation and fibrotic responses that eventually lead to chronic kidney disease. Because the inflammasome, interleukin 1 (IL-1), IL-1α/IL-β, and IL-1R are central elements of kidney inflammation and pharmacological IL-1R antagonist (IL-1Ra) was shown to prevent or even reverse diabetic nephropathy (DN) in animal models, we explored the intrinsic expression of IL-1 molecules in kidney tissue of DN patients as regulators of renal inflammation. We used biopsies taken from DN patients and controls and show a high level of IL-1α expression in renal tubular epithelial cells, whereas both IL-1 agonistic molecules (i.e., IL-1α and IL-1β) were devoid of the glomeruli. Human proximal tubular kidney HK-2 cells exposed to high glucose (HG) gradually increase the expression of IL-1α but not IL-1β and induce the expression and deposition of extracellular matrix (ECM) proteins. We further demonstrate that in vitro ectopic addition of recombinant IL-1α in low glucose concentration leads to a similar effect as in HG, while supplementing excess amounts of IL-1Ra in HG significantly attenuates the ECM protein overexpression and deposition. Accordingly, inhibition of IL-1α cleaving protease calpain, but not caspapse-1, also strongly reduces ECM protein production by HK-2 cells. Collectively, we demonstrate that IL-1α and not IL-1β, released from renal tubular cells is the key inflammatory molecule responsible for the renal inflammation in DN. Our result suggests that the clinical use of IL-1Ra in DN should be promoted over the individual neutralization of IL-1α or IL-1β in order to achieve better blocking of IL-1R signaling.
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Affiliation(s)
- Talal Salti
- Galilee Medical Center, Research Institute, Nahariya, Israel
| | - Khaled Khazim
- Galilee Medical Center, Research Institute, Nahariya, Israel.,Azrieli Faculty of Medicine, Bar-Ilan University, Safed, Israel.,Department of Nephrology and Hypertension, Galilee Medical Center, Nahariya, Israel
| | - Rami Haddad
- Galilee Medical Center, Research Institute, Nahariya, Israel
| | | | - Gil Bar-Sela
- Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel.,Cancer Center, Emek Medical Center, Afula, Israel
| | - Idan Cohen
- Cancer Center, Emek Medical Center, Afula, Israel
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12
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Wang Y, Fang Q, Jin Y, Liu Z, Zou C, Yu W, Li W, Shan X, Chen R, Khan Z, Liang G. Blockade of myeloid differentiation 2 attenuates diabetic nephropathy by reducing activation of the renin-angiotensin system in mouse kidneys. Br J Pharmacol 2019; 176:2642-2657. [PMID: 30959575 PMCID: PMC6592858 DOI: 10.1111/bph.14687] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Revised: 03/12/2019] [Accepted: 03/21/2019] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND AND PURPOSE Both innate immunity and the renin-angiotensin system (RAS) play important roles in the pathogenesis of diabetic nephropathy (DN). Myeloid differentiation factor 2 (MD2) is a co-receptor of toll-like receptor 4 (TLR4) in innate immunity. While TLR4 is involved in the development of DN, the role of MD2 in DN has not been characterized. It also remains unclear whether the MD2/TLR4 signalling pathway is associated with RAS activation in diabetes. EXPERIMENTAL APPROACH MD2 was blocked using siRNA or the low MW inhibitor, L6H9, in renal proximal tubular cells (NRK-52E cells) exposed to high concentrations of glucose (HG). In vivo, C57BL/6 and MD2-/- mice were injected with streptozotocin to induce Type 1 diabetes and nephropathy. KEY RESULTS Inhibition of MD2 by genetic knockdown or the inhibitor L6H9 suppressed HG-induced expression of ACE and angiotensin receptors and production of angiotensin II in NRK-52E cells, along with decreased fibrosis markers (TGF-β and collagen IV). Inhibition of the MD2/TLR4-MAPKs pathway did not affect HG-induced renin overproduction. In vivo, using the streptozotocin-induced diabetic mice, MD2 was overexpressed in diabetic kidney. MD2 gene knockout or L6H9 attenuated renal fibrosis and dysfunction by suppressing local RAS activation and inflammation. CONCLUSIONS AND IMPLICATIONS Hyperglycaemia activated the MD2/TLR4-MAPKs signalling cascade to induce renal RAS activation, leading to renal fibrosis and dysfunction. Pharmacological inhibition of MD2 may be considered as a therapeutic approach to mitigate DN and the low MW inhibitor L6H9 could be a candidate for such therapy.
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MESH Headings
- Animals
- Cells, Cultured
- Chalcone/pharmacology
- Diabetes Mellitus, Experimental/chemically induced
- Diabetes Mellitus, Experimental/drug therapy
- Diabetes Mellitus, Experimental/immunology
- Diabetes Mellitus, Type 1/chemically induced
- Diabetes Mellitus, Type 1/drug therapy
- Diabetes Mellitus, Type 1/immunology
- Diabetic Nephropathies/chemically induced
- Diabetic Nephropathies/drug therapy
- Diabetic Nephropathies/immunology
- Kidney/drug effects
- Kidney/immunology
- Lymphocyte Antigen 96/antagonists & inhibitors
- Lymphocyte Antigen 96/deficiency
- Lymphocyte Antigen 96/immunology
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- RNA, Small Interfering/pharmacology
- Renin-Angiotensin System/drug effects
- Renin-Angiotensin System/immunology
- Streptozocin
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Affiliation(s)
- Yi Wang
- Chemical Biology Research Center, School of Pharmaceutical SciencesWenzhou Medical UniversityWenzhouZhejiangChina
| | - Qilu Fang
- Chemical Biology Research Center, School of Pharmaceutical SciencesWenzhou Medical UniversityWenzhouZhejiangChina
| | - Yiyi Jin
- Chemical Biology Research Center, School of Pharmaceutical SciencesWenzhou Medical UniversityWenzhouZhejiangChina
| | - Zhoudi Liu
- Chemical Biology Research Center, School of Pharmaceutical SciencesWenzhou Medical UniversityWenzhouZhejiangChina
| | - Chunpeng Zou
- The Second Affiliated HospitalWenzhou Medical UniversityWenzhouZhejiangChina
| | - Weihui Yu
- Department of Endocrinology, The First Affiliated Yueqing HospitalWenzhou Medical UniversityWenzhouZhejiangChina
| | - Weixin Li
- Chemical Biology Research Center, School of Pharmaceutical SciencesWenzhou Medical UniversityWenzhouZhejiangChina
| | - Xiaoou Shan
- The Second Affiliated HospitalWenzhou Medical UniversityWenzhouZhejiangChina
| | - Ruijie Chen
- The Second Affiliated HospitalWenzhou Medical UniversityWenzhouZhejiangChina
| | - Zia Khan
- Chemical Biology Research Center, School of Pharmaceutical SciencesWenzhou Medical UniversityWenzhouZhejiangChina
| | - Guang Liang
- Chemical Biology Research Center, School of Pharmaceutical SciencesWenzhou Medical UniversityWenzhouZhejiangChina
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13
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Wang J, Shibayama Y, Kobori H, Liu Y, Kobara H, Masaki T, Wang Z, Nishiyama A. High glucose augments angiotensinogen in human renal proximal tubular cells through hepatocyte nuclear factor-5. PLoS One 2017; 12:e0185600. [PMID: 29053707 PMCID: PMC5650141 DOI: 10.1371/journal.pone.0185600] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Accepted: 09/17/2017] [Indexed: 01/01/2023] Open
Abstract
High glucose has been demonstrated to induce angiotensinogen (AGT) synthesis in the renal proximal tubular cells (RPTCs) of rats, which may further activate the intrarenal renin-angiotensin system (RAS) and contribute to diabetic nephropathy. This study aimed to investigate the effects of high glucose on AGT in the RPTCs of human origin and identify the glucose-responsive transcriptional factor(s) that bind(s) to the DNA sequences of AGT promoter in human RPTCs. Human kidney (HK)-2 cells were treated with normal glucose (5.5 mM) and high glucose (15.0 mM), respectively. Levels of AGT mRNA and AGT secretion of HK-2 cells were measured by real-time polymerase chain reaction (PCR) and enzyme-linked immunosorbent assay (ELISA), respectively. Consecutive 5’-end deletion mutant constructs and different site-directed mutagenesis products of human AGT promoter sequences were respectively transfected into HK-2 cells, followed by AGT promoter activity measurement through dual luciferase assay. High glucose significantly augmented the levels of AGT mRNA and AGT secretion of HK-2 cells, compared with normal glucose treatment. High glucose also significantly augmented AGT promoter activity in HK-2 cells transfected with the constructs of human AGT promoter sequences, compared with normal glucose treatment. Hepatocyte nuclear factor (HNF)-5 was found to be one of the glucose-responsive transcriptional factors of AGT in human RPTCs, since the mutation of its binding sites within AGT promoter sequences abolished the above effects of high glucose on AGT promoter activity as well as levels of AGT mRNA and its secretion. The present study has demonstrated, for the first time, that high glucose augments AGT in human RPTCs through HNF-5, which provides a potential therapeutic target for diabetic nephropathy.
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Affiliation(s)
- Juan Wang
- Department of Pharmacology, Faculty of Medicine, Kagawa University, Kagawa, Japan
- Department of Immuno-oncology, Fourth Hospital of Hebei Medical University, Shijiazhuang, P.R. China
| | - Yuki Shibayama
- Department of Pharmacology, Faculty of Medicine, Kagawa University, Kagawa, Japan
| | - Hiroyuki Kobori
- Department of Pharmacology, Faculty of Medicine, Kagawa University, Kagawa, Japan
- Departments of Pharmacology and of Nephrology, School of Medicine, International University of Health and Welfare, Tokyo, Japan
| | - Ya Liu
- Department of Pharmacology, Faculty of Medicine, Kagawa University, Kagawa, Japan
| | - Hideki Kobara
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Kagawa, Japan
| | - Tsutomu Masaki
- Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Kagawa, Japan
| | - Zhiyu Wang
- Department of Immuno-oncology, Fourth Hospital of Hebei Medical University, Shijiazhuang, P.R. China
| | - Akira Nishiyama
- Department of Pharmacology, Faculty of Medicine, Kagawa University, Kagawa, Japan
- * E-mail:
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14
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Shin SJ, Chung S, Kim SJ, Lee EM, Yoo YH, Kim JW, Ahn YB, Kim ES, Moon SD, Kim MJ, Ko SH. Effect of Sodium-Glucose Co-Transporter 2 Inhibitor, Dapagliflozin, on Renal Renin-Angiotensin System in an Animal Model of Type 2 Diabetes. PLoS One 2016; 11:e0165703. [PMID: 27802313 PMCID: PMC5089752 DOI: 10.1371/journal.pone.0165703] [Citation(s) in RCA: 130] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Accepted: 10/17/2016] [Indexed: 12/13/2022] Open
Abstract
Background Renal renin-angiotensin system (RAS) activation is one of the important pathogenic mechanisms in the development of diabetic nephropathy in type 2 diabetes. The aim of this study was to investigate the effects of a sodium-glucose co-transporter 2 (SGLT-2) inhibitor, dapagliflozin, on renal RAS in an animal model with type 2 diabetes. Methods Dapagliflozin (1.0 mg/kg, OL-DA) or voglibose (0.6 mg/kg, OL-VO, diabetic control) (n = 10 each) was administered to Otsuka Long-Evans Tokushima Fatty (OLETF) rats for 12 weeks. We used voglibose, an alpha-glucosidase inhibitor, as a comparable counterpart to SGLT2 inhibitor because of its postprandial glucose-lowering effect without proven renoprotective effects. Control Long-Evans Tokushima Otsuka (LT) and OLETF (OL-C) rats received saline (n = 10, each). Changes in blood glucose, urine albumin, creatinine clearance, and oxidative stress were measured. Inflammatory cell infiltration, mesangial widening, and interstitial fibrosis in the kidney were evaluated by histological analysis. The effects of dapagliflozin on renal expression of the RAS components were evaluated by quantitative RT-PCR in renal tissue. Results After treatment, hyperglycemia and urine microalbumin levels were attenuated in both OL-DA and OL-VO rather than in the OL-C group (P < 0.05). The urine angiotensin II (Ang II) and angiotensinogen levels were significantly decreased following treatment with dapagliflozin or voglibose, but suppression of urine Ang II level was more prominent in the OL-DA than the OL-VO group (P < 0.05). The expressions of angiotensin type 1 receptor and tissue oxidative stress markers were markedly increased in OL-C rats, which were reversed by dapagliflozin or voglibose (P < 0.05, both). Inflammatory cell infiltration, mesangial widening, interstitial fibrosis, and total collagen content were significantly increased in OL-C rats, which were attenuated in OL-DA group (P < 0.05). Conclusion Dapagliflozin treatment showed beneficial effects on diabetic nephropathy, which might be via suppression of renal RAS component expression, oxidative stress and interstitial fibrosis in OLETF rats. We suggest that, in addition to control of hyperglycemia, partial suppression of renal RAS with an SGLT2 inhibitor would be a promising strategy for the prevention of treatment of diabetic nephropathy.
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Affiliation(s)
- Seok Joon Shin
- Division of Nephrology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Sungjin Chung
- Division of Nephrology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Soo Jung Kim
- Division of Nephrology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Eun-Mi Lee
- Division of Endocrinology & Metabolism, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Young-Hye Yoo
- Division of Endocrinology & Metabolism, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Ji-Won Kim
- Division of Endocrinology & Metabolism, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Yu-Bae Ahn
- Division of Endocrinology & Metabolism, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Eun-Sook Kim
- Division of Endocrinology & Metabolism, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Sung-Dae Moon
- Division of Endocrinology & Metabolism, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Myung-Jun Kim
- Department of Physiology, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Seung-Hyun Ko
- Division of Endocrinology & Metabolism, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea
- * E-mail:
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15
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Wang P, Deng L, Zhuang C, Cheng C, Xu K. p-CREB-1 promotes hepatic fibrosis through the transactivation of transforming growth factor-β1 expression in rats. Int J Mol Med 2016; 38:521-8. [PMID: 27279449 DOI: 10.3892/ijmm.2016.2630] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 05/31/2016] [Indexed: 11/06/2022] Open
Abstract
Phosphorylated cAMP-responsive element binding protein-1 (p-CREB-1) is an important transcription factor which has been reported to be implicated in fibrogenesis. However, the association between p-CREB-1 and transforming growth factor-β1 (TGF-β1)-mediated liver fibrogenesis remains poorly understood. In the present study, exogenous TGF-β1 recombinant protein was used to activate hepatic stellate cells (HSCs), and we established a rat model of tetrachloromethane (CCl4)‑induced liver fibrosis. Loss- and gain-of-function studies were performed to examine the role of p-CREB-1 in liver fibrogenesis, and the detailed mechanism responsible for these effects was further explored using chromatin immunoprecipitation and luciferase reporter gene assays. We found that p-CREB-1 expression was significantly upregulated in a rat model of hepatic fibrosis. We also demonstrated that p-CREB-1 increased TGF-β1 expression and auto‑induction in HSCs, through directly binding to the CRE site within the TGF-β1 promoter in order to enhance its transcriptional activity. Moreover, lentivirus-mediated CREB-1 overexpression promoted hepatic fibrogenesis in rats. These findings suggest that p-CREB-1 may function as a potent profibrogenic factor through the transactivation of TGF-β1 expression in liver fibrosis.
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Affiliation(s)
- Pei Wang
- Division of Gastroenterology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China
| | - Liang Deng
- Department of Gastroenterology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China
| | - Chunbo Zhuang
- Department of Clinical Laboratory, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China
| | - Chunwei Cheng
- Division of Gastroenterology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China
| | - Keshu Xu
- Division of Gastroenterology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China
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16
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Sun C, Shang J, Yao Y, Yin X, Liu M, Liu H, Zhou Y. O-GlcNAcylation: a bridge between glucose and cell differentiation. J Cell Mol Med 2016; 20:769-81. [PMID: 26929182 PMCID: PMC4831356 DOI: 10.1111/jcmm.12807] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Accepted: 01/08/2016] [Indexed: 12/12/2022] Open
Abstract
Glucose is the major energy supply and a critical metabolite for most cells and is especially important when cell is differentiating. High or low concentrations of glucose enhances or inhibits the osteogenic, chondrogenic and adipogenic differentiation of cell via the insulin, transforming growth factor‐β and peroxisome proliferator‐activated receptor γ pathways, among others. New evidence implicates the hexosamine biosynthetic pathway as a mediator of crosstalk between glucose flux, cellular signalling and epigenetic regulation of cell differentiation. Extracellular glucose flux alters intracellular O‐GlcNAcylation levels through the hexosamine biosynthetic pathway. Signalling molecules that are important for cell differentiation, including protein kinase C, extracellular signal‐regulated kinase, Runx2, CCAAT/enhancer‐binding proteins, are modified by O‐GlcNAcylation. Thus, O‐GlcNAcylation markedly alters cell fate during differentiation via the post‐transcriptional modification of proteins. Furthermore, O‐GlcNAcylation and phosphorylation show complex interactions during cell differentiation: they can either non‐competitively occupy different sites on a substrate or competitively occupy a single site or proximal sites. Therefore, the influence of glucose on cell differentiation via O‐GlcNAcylation offers a potential target for controlling tissue homoeostasis and regeneration in ageing and disease. Here, we review recent progress establishing an emerging relationship among glucose concentration, O‐GlcNAcylation levels and cell differentiation.
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Affiliation(s)
- Chao Sun
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing, China
| | - Jin Shang
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing, China
| | - Yuan Yao
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing, China
| | - Xiaohong Yin
- Center for Evidence-based and Translational Medicine, Zhongnan Hospital, Wuhan University, Wuhan, China
| | - Minghan Liu
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing, China
| | - Huan Liu
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing, China
| | - Yue Zhou
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing, China
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17
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Gregorini M, Corradetti V, Rocca C, Pattonieri EF, Valsania T, Milanesi S, Serpieri N, Bedino G, Esposito P, Libetta C, Avanzini MA, Mantelli M, Ingo D, Peressini S, Albertini R, Dal Canton A, Rampino T. Mesenchymal Stromal Cells Prevent Renal Fibrosis in a Rat Model of Unilateral Ureteral Obstruction by Suppressing the Renin-Angiotensin System via HuR. PLoS One 2016; 11:e0148542. [PMID: 26866372 PMCID: PMC4750962 DOI: 10.1371/journal.pone.0148542] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Accepted: 01/19/2016] [Indexed: 02/07/2023] Open
Abstract
We studied Mesenchymal Stromal Cells (MSC) effects in experimental Unilateral Ureteral Obstruction (UUO), a fibrogenic renal disease. Rats were divided in 5 groups: sham, UUO, MSC treated-UUO, ACEi treated-UUO, MSC+ACEi treated- UUO. Data were collected at 1, 7, 21 days. UUO induced monocyte renal infiltration, tubular cell apoptosis, tubular atrophy, interstitial fibrosis and overexpression of TGFβ, Renin mRNA (RENmRNA), increase of Renin, Angiotensin II (AII) and aldosterone serum levels. Both lisinopril (ACEi) and MSC treatment prevented monocyte infiltration, reduced tubular cell apoptosis, renal fibrosis and TGFβ expression. Combined therapy provided a further suppression of monocyte infiltration and tubular injury. Lisinopril alone caused a rebound activation of Renin-Angiotensin System (RAS), while MSC suppressed RENmRNA and Renin synthesis and induced a decrease of AII and aldosterone serum levels. Furthermore, in in-vitro and in-vivo experiments, MSC inhibit Human antigen R (HuR) trascription, an enhancer of RENmRNA stability by IL10 release. In conclusion, we demonstrate that in UUO MSC prevent fibrosis, by decreasing HuR-dependent RENmRNA stability. Our findings give a clue to understand the molecular mechanism through which MSC may prevent fibrosis in a wide and heterogeneous number of diseases that share RAS activation as common upstream pathogenic mechanism.
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Affiliation(s)
- Marilena Gregorini
- Unit of Nephrology, Dialysis, Transplantation, Fondazione IRCCS Policlinico San Matteo and University of Pavia, Pavia, Italy
| | - Valeria Corradetti
- Unit of Nephrology, Dialysis, Transplantation, Fondazione IRCCS Policlinico San Matteo and University of Pavia, Pavia, Italy
- * E-mail:
| | - Chiara Rocca
- Unit of Nephrology, Dialysis, Transplantation, Fondazione IRCCS Policlinico San Matteo and University of Pavia, Pavia, Italy
| | - Eleonora Francesca Pattonieri
- Unit of Nephrology, Dialysis, Transplantation, Fondazione IRCCS Policlinico San Matteo and University of Pavia, Pavia, Italy
| | - Teresa Valsania
- Unit of Nephrology, Dialysis, Transplantation, Fondazione IRCCS Policlinico San Matteo and University of Pavia, Pavia, Italy
| | - Samantha Milanesi
- Unit of Nephrology, Dialysis, Transplantation, Fondazione IRCCS Policlinico San Matteo and University of Pavia, Pavia, Italy
| | - Nicoletta Serpieri
- Unit of Nephrology, Dialysis, Transplantation, Fondazione IRCCS Policlinico San Matteo and University of Pavia, Pavia, Italy
| | - Giulia Bedino
- Unit of Nephrology, Dialysis, Transplantation, Fondazione IRCCS Policlinico San Matteo and University of Pavia, Pavia, Italy
| | - Pasquale Esposito
- Unit of Nephrology, Dialysis, Transplantation, Fondazione IRCCS Policlinico San Matteo and University of Pavia, Pavia, Italy
| | - Carmelo Libetta
- Unit of Nephrology, Dialysis, Transplantation, Fondazione IRCCS Policlinico San Matteo and University of Pavia, Pavia, Italy
| | - Maria Antonietta Avanzini
- Laboratory of Transplant Immunology/Cell Factory Fondazione IRCCS Policlinico S. Matteo, Pavia, Italy
| | - Melissa Mantelli
- Laboratory of Transplant Immunology/Cell Factory Fondazione IRCCS Policlinico S. Matteo, Pavia, Italy
| | - Daniela Ingo
- Laboratory of Transplant Immunology/Cell Factory Fondazione IRCCS Policlinico S. Matteo, Pavia, Italy
| | - Sabrina Peressini
- Clinical Chemistry Laboratory Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
| | - Riccardo Albertini
- Clinical Chemistry Laboratory Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
| | - Antonio Dal Canton
- Unit of Nephrology, Dialysis, Transplantation, Fondazione IRCCS Policlinico San Matteo and University of Pavia, Pavia, Italy
| | - Teresa Rampino
- Unit of Nephrology, Dialysis, Transplantation, Fondazione IRCCS Policlinico San Matteo and University of Pavia, Pavia, Italy
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18
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Li C, Lin Y, Luo R, Chen S, Wang F, Zheng P, Levi M, Yang T, Wang W. Intrarenal renin-angiotensin system mediates fatty acid-induced ER stress in the kidney. Am J Physiol Renal Physiol 2015; 310:F351-63. [PMID: 26672616 DOI: 10.1152/ajprenal.00223.2015] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Accepted: 12/11/2015] [Indexed: 12/27/2022] Open
Abstract
Obesity-related kidney disease is related to caloric excess promoting deleterious cellular responses. Accumulation of saturated free fatty acids in tubular cells produces lipotoxicity involving significant cellular dysfunction and injury. The objectives of this study were to elucidate the role of renin-angiotensin system (RAS) activation in saturated fatty acid-induced endoplasmic reticulum (ER) stress in cultured human proximal tubule epithelial cells (HK2) and in mice fed with a high-fat diet. Treatment with saturated fatty acid palmitic acid (PA; 0.8 mM) for 24 h induced ER stress in HK2, leading to an unfolded protein response as reflected by increased expressions of the ER chaperone binding immunoglobulin protein (BiP) and proapoptotic transcription factor C/EBP homologous protein (CHOP) protein as evaluated by immunoblotting. PA treatment also induced increased protein expression of inositol requiring protein 1α (IRE1α), phosphorylated eukaryotic initiation factor-α (eIF2α), and activating transcription factor 4 (ATF4) as well as activation of caspase-3. PA treatment was associated with increased angiotensin II levels in cultured medium. The angiotensin II type 1 receptor (AT1R) blocker valsartan or renin inhibitor aliskiren dramatically suppressed PA-induced upregulation of BiP, CHOP, IRE1α, p-eIF2α, and ATF4 in HK2 cells. In contrast, valsartan or aliskiren did not prevent ER stress induced by tunicamycin. C57BL/6 mice fed with a high-fat diet for 14 wk exhibited increased protein expressions of BiP and CHOP compared with control mice, which were significantly attenuated by the valsartan treatment. Increased angiotensin II levels in serum and urine were observed in mice fed with a high-fat diet when compared with controls. It is suggested that the intrarenal RAS activation may play an important role in diabetic kidney injury via mediating ER stress induced by saturated fatty acid.
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Affiliation(s)
- Chunling Li
- Institute of Hypertension, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Yu Lin
- Institute of Hypertension, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Renfei Luo
- Institute of Hypertension, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Shaoming Chen
- Department of Orthopedics, The 5th Affiliated Hospital, Sun Yat-sen University, Zhuhai, China
| | - Feifei Wang
- Institute of Hypertension, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China;
| | - Peili Zheng
- Institute of Hypertension, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Moshe Levi
- Department of Medicine, Division of Hypertension and Renal Diseases, University of Colorado Denver, Aurora, Colorado; and
| | - Tianxin Yang
- Institute of Hypertension, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China; Department of Medicine, Division of Renal Diseases and Hypertension, University of Utah, Salt Lake City, Utah
| | - Weidong Wang
- Institute of Hypertension, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
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Abstract
Diabetic nephropathy (DN) is the most common cause of end-stage renal disease (ESRD). About 20%-30% of people with type 1 and type 2 diabetes develop DN. DN is characterized by both glomerulosclerosis with thickening of the glomerular basement membrane and mesangial matrix expansion, and tubulointerstitial fibrosis. Hyperglycemia and the activation of the intra-renal renin-angiotensin system (RAS) in diabetes have been suggested to play a critical role in the pathogenesis of DN. However, the mechanisms are not well known. Studies from our laboratory demonstrated that the transcription factor-upstream stimulatory factor 2 (USF2) is an important regulator of DN. Moreover, the renin gene is a downstream target of USF2. Importantly, USF2 transgenic (Tg) mice demonstrate a specific increase in renal renin expression and angiotensin II (AngII) levels in kidney and exhibit increased urinary albumin excretion and extracellular matrix deposition in glomeruli, supporting a role for USF2 in the development of diabetic nephropathy. In this review, we summarize our findings of the mechanisms by which diabetes regulates USF2 in kidney cells and its role in regulation of renal renin-angiotensin system and the development of diabetic nephropathy.
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Affiliation(s)
- Shuxia Wang
- Department of Pharmacology and Nutritional Sciences, University of Kentucky, Lexington, KY 40536, USA
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20
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Yasumoto M, Tsuda A, Ishimura E, Uedono H, Ohno Y, Ichii M, Ochi A, Nakatani S, Mori K, Uchida J, Emoto M, Nakatani T, Inaba M. Significant association between glycemic status and increased estimated postglomerular resistance in nondiabetic subjects - study of inulin and para-aminohippuric acid clearance in humans. Physiol Rep 2015; 3:3/3/e12321. [PMID: 25742958 PMCID: PMC4393156 DOI: 10.14814/phy2.12321] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
We investigated whether glomerular hemodynamic parameters in nondiabetic subjects, including healthy subjects, are associated with glycemic status indices, by simultaneous measurement of inulin (Cin) and para-aminohippuric acid (CPHA) clearance. Twenty-six subjects (age 49.5 ± 13.3 years; 13 men and 13 women; 14 healthy subjects and 12 subjects with mild proteinuria) were enrolled. Cin and CPAH were measured simultaneously. All 26 subjects were nondiabetics. Estimated preglomerular resistance, estimated postglomerular resistance, and estimated glomerular hydrostatic pressure (Pglo) were calculated according to Gomez’ formula. Pglo correlated significantly and positively with hemoglobin A1c (HbA1c) in both healthy subjects (r = 0.532, P = 0.0498) and subjects with mild proteinuria (r = 0.681, P = 0.015). While there was no significant correlation between estimated preglomerular resistance and HbA1c, estimated postglomerular resistance correlated significantly and positively with HbA1c both in healthy subjects (r = 0.643, P = 0.013) and subjects with mild proteinuria (r = 0.589, P = 0.044). Glomerular filtration fraction, estimated Pglo and estimated postglomerular resistance in total subjects were associated significantly with HbA1c after adjustment for age, gender, and body mass index. These results demonstrate that, even in nondiabetic subjects, glycemic status is associated with estimated postglomerular resistance, but not estimated preglomerular resistance. It is suggested that increased estimated postglomerular resistance associated with higher HbA1c levels, even within the normal range, causes increased estimated Pglo, leading to increased FF. Thus, hemodynamic abnormalities associated with higher HbA1c levels may be related to glomerular hypertension, even in nondiabetic subjects.
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Affiliation(s)
- Mari Yasumoto
- Department of Nephrology, Department of Metabolism, Endocrinology and Molecular Medicine, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Akihiro Tsuda
- Department of Nephrology, Department of Metabolism, Endocrinology and Molecular Medicine, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Eiji Ishimura
- Department of Nephrology, Department of Metabolism, Endocrinology and Molecular Medicine, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Hideki Uedono
- Department of Nephrology, Department of Metabolism, Endocrinology and Molecular Medicine, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Yoshiteru Ohno
- Department of Nephrology, Department of Metabolism, Endocrinology and Molecular Medicine, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Mitsuru Ichii
- Department of Nephrology, Department of Metabolism, Endocrinology and Molecular Medicine, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Akinobu Ochi
- Department of Nephrology, Department of Metabolism, Endocrinology and Molecular Medicine, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Shinya Nakatani
- Department of Nephrology, Department of Metabolism, Endocrinology and Molecular Medicine, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Katsuhito Mori
- Department of Nephrology, Department of Metabolism, Endocrinology and Molecular Medicine, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Junji Uchida
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Masanori Emoto
- Department of Nephrology, Department of Metabolism, Endocrinology and Molecular Medicine, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Tatsuya Nakatani
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Masaaki Inaba
- Department of Nephrology, Department of Metabolism, Endocrinology and Molecular Medicine, Osaka City University Graduate School of Medicine, Osaka, Japan
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Wilson BA, Cruz-Diaz N, Marshall AC, Pirro NT, Su Y, Gwathmey TM, Rose JC, Chappell MC. An angiotensin-(1-7) peptidase in the kidney cortex, proximal tubules, and human HK-2 epithelial cells that is distinct from insulin-degrading enzyme. Am J Physiol Renal Physiol 2015; 308:F594-601. [PMID: 25568136 DOI: 10.1152/ajprenal.00609.2014] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Angiotensin 1-7 [ANG-(1-7)] is expressed within the kidney and exhibits renoprotective actions that antagonize the inflammatory, fibrotic, and pro-oxidant effects of ANG II. We previously identified an peptidase that preferentially metabolized ANG-(1-7) to ANG-(1-4) in the brain medulla and cerebrospinal fluid (CSF) of sheep (Marshall AC, Pirro NT, Rose JC, Diz DI, Chappell MC. J Neurochem 130: 313-323, 2014); thus the present study established the expression of the peptidase in the kidney. Utilizing a sensitive HPLC-based approach, we demonstrate a peptidase activity that hydrolyzed ANG-(1-7) to ANG-(1-4) in the sheep cortex, isolated tubules, and human HK-2 renal epithelial cells. The peptidase was markedly sensitive to the metallopeptidase inhibitor JMV-390; human HK-2 cells expressed subnanomolar sensitivity (IC50 = 0.5 nM) and the highest specific activity (123 ± 5 fmol·min(-1)·mg(-1)) compared with the tubules (96 ± 12 fmol·min(-1)·mg(-1)) and cortex (107 ± 9 fmol·min(-1)·mg(-1)). The peptidase was purified 41-fold from HK-2 cells; the activity was sensitive to JMV-390, the chelator o-phenanthroline, and the mercury-containing compound p-chloromercuribenzoic acid (PCMB), but not to selective inhibitors against neprilysin, neurolysin and thimet oligopeptidase. Both ANG-(1-7) and its endogenous analog [Ala(1)]-ANG-(1-7) (alamandine) were preferentially hydrolyzed by the peptidase compared with ANG II, [Asp(1)]-ANG II, ANG I, and ANG-(1-12). Although the ANG-(1-7) peptidase and insulin-degrading enzyme (IDE) share similar inhibitor characteristics of a metallothiolendopeptidase, we demonstrate marked differences in substrate specificity, which suggest these peptidases are distinct. We conclude that an ANG-(1-7) peptidase is expressed within the renal proximal tubule and may play a potential role in the renal renin-angiotensin system to regulate ANG-(1-7) tone.
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Affiliation(s)
- Bryan A Wilson
- Hypertension and Vascular Research Center, Wake Forest University School of Medicine, Winston-Salem, North Cartolina; and
| | - Nildris Cruz-Diaz
- Hypertension and Vascular Research Center, Wake Forest University School of Medicine, Winston-Salem, North Cartolina; and
| | - Allyson C Marshall
- Hypertension and Vascular Research Center, Wake Forest University School of Medicine, Winston-Salem, North Cartolina; and
| | - Nancy T Pirro
- Hypertension and Vascular Research Center, Wake Forest University School of Medicine, Winston-Salem, North Cartolina; and
| | - Yixin Su
- Department of Obstetrics and Gynecology, Wake Forest University School of Medicine, Winston-Salem, North Cartolina
| | - TanYa M Gwathmey
- Hypertension and Vascular Research Center, Wake Forest University School of Medicine, Winston-Salem, North Cartolina; and
| | - James C Rose
- Department of Obstetrics and Gynecology, Wake Forest University School of Medicine, Winston-Salem, North Cartolina
| | - Mark C Chappell
- Hypertension and Vascular Research Center, Wake Forest University School of Medicine, Winston-Salem, North Cartolina; and
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Tsuda A, Ishimura E, Ohno Y, Ichii M, Nakatani S, Mori K, Fukumoto S, Emoto M, Inaba M. Significant association of poor glycemic control with increased resistance in efferent arterioles--study of inulin and para-aminohippuric acid clearance in humans. Diabetes Res Clin Pract 2014; 104:234-40. [PMID: 24598266 DOI: 10.1016/j.diabres.2014.01.030] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Revised: 11/14/2013] [Accepted: 01/28/2014] [Indexed: 02/08/2023]
Abstract
AIMS To examine whether glomerular hemodynamic parameters in humans are associated with glycemic control indices, by simultaneously measuring clearance of inulin (Cin) and para-aminohippuric acid (CPHA). METHODS Thirty-one subjects (age 55.4±14.7 years; 15 men and 16 women; 21 diabetics and 10 non-diabetics) were enrolled. Cin and CPAH were measured simultaneously. Afferent arteriolar resistance (Ra), efferent arteriolar resistance (Re), glomerular hydrostatic pressure (Pglo) and glomerular filtration fraction (FF) were calculated according to Gomez' formula. RESULTS FF correlated significantly and positively with fasting plasma glucose (FPG), hemoglobin A1c (HbA1c) and glycated albumin (GA) (r=0.396, p=0.0303; r=0.587, p=0.0007; r=0.525, p=0.0070, respectively). Pglo correlated significantly and positively with FPG, HbA1c and GA (r=0.572, p=0.0008; r=0.535, p=0.0019; r=0.540, p=0.0053, respectively). Although there was no significant correlation between Ra and glycemic control indices, Re correlated significantly and positively with HbA1c and GA (r=0.499, p=0.0043; r=0.592, p=0.0018, respectively). FF, Pglo and Re were associated significantly with HbA1c and GA after adjustment for age. CONCLUSIONS These results demonstrate, in humans, that poor glycemic control is associated with increased Re, but not Ra. It is suggested that increased Re causes increased Pglo, leading to increased FF. Thus, hemodynamic abnormalities with poor glycemic control may be related to glomerular hypertension in humans.
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Affiliation(s)
- A Tsuda
- Department of Endocrinology, Metabolism and Molecular Medicine, Japan
| | - E Ishimura
- Department of Nephrology, Osaka City University, Graduate School of Medicine, Osaka, Japan.
| | - Y Ohno
- Department of Endocrinology, Metabolism and Molecular Medicine, Japan
| | - M Ichii
- Department of Endocrinology, Metabolism and Molecular Medicine, Japan
| | - S Nakatani
- Department of Endocrinology, Metabolism and Molecular Medicine, Japan
| | - K Mori
- Department of Endocrinology, Metabolism and Molecular Medicine, Japan
| | - S Fukumoto
- Department of Endocrinology, Metabolism and Molecular Medicine, Japan
| | - M Emoto
- Department of Endocrinology, Metabolism and Molecular Medicine, Japan
| | - M Inaba
- Department of Endocrinology, Metabolism and Molecular Medicine, Japan
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23
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Pan Y, Huang Y, Wang Z, Fang Q, Sun Y, Tong C, Peng K, Wang Y, Miao L, Cai L, Zhao Y, Liang G. Inhibition of MAPK-mediated ACE expression by compound C66 prevents STZ-induced diabetic nephropathy. J Cell Mol Med 2013; 18:231-41. [PMID: 24330074 PMCID: PMC3930410 DOI: 10.1111/jcmm.12175] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2013] [Accepted: 10/02/2013] [Indexed: 01/09/2023] Open
Abstract
A range of in vitro, experimental and clinical intervention studies have implicated an important role for hyperglycaemia-induced activation of the renin-angiotensin system (RAS) in the development and progression of diabetic nephropathy (DN). Blockade of RAS by angiotensin converting enzyme (ACE) inhibitors is an effective strategy in treating diabetic kidney diseases. However, few studies demonstrate the mechanism by which hyperglycaemia up-regulates the expression of ACE gene. Our previous studies have identified a novel curcumin analogue, (2E,6E)-2,6-bis(2-(trifluoromethyl)benzylidene)cyclohexanone (C66), which could inhibit the high glucose (HG)-induced phosphorylation of mitogen-activated protein kinases in mouse macrophages. In this study, we found that the renal protection of C66 in diabetic mice was associated with mitogen-activated protein kinase (MAPK) inactivation and ACE/angiotensin II (Ang II) down-regulation. Generally, MAPKs have been considered as a downstream signalling of Ang II and a mediator for Ang II-induced pathophysiological actions. However, using C66 and specific inhibitors as small molecule probes, in vitro experiments demonstrate that the MAPK signalling pathway regulates ACE expression under HG stimulation, which contributes to renal Ang II activation and the development of DN. This study indicates that C66 is a potential candidate of DN therapeutic agents, and more importantly, that reduction in ACE expression by MAPKs inhibition seems to be an alternative strategy for the treatment of DN.
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Affiliation(s)
- Yong Pan
- Chemical Biology Research Center, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China; Chinese-American Research Institute for Diabetic Complications, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
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Samarakoon R, Overstreet JM, Higgins PJ. TGF-β signaling in tissue fibrosis: redox controls, target genes and therapeutic opportunities. Cell Signal 2012; 25:264-8. [PMID: 23063463 DOI: 10.1016/j.cellsig.2012.10.003] [Citation(s) in RCA: 269] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2012] [Accepted: 10/07/2012] [Indexed: 10/27/2022]
Abstract
During development of TGF-β1-initiated fibroproliferative disorders, NADPH oxidases (NOX family members) generate reactive oxygen species (ROS) resulting in downstream transcription of a subset genes encoding matrix structural elements and profibrotic factors. Prominent among the repertoire of disease-implicated genes is the TGF-β1 target gene encoding the potent profibrotic matricellular protein plasminogen activator inhibitor-1 (PAI-1 or SERPINE1). PAI-1 is the major physiologic inhibitor of the plasmin-based pericellular cascade and a causative factor in the development of vascular thrombotic and fibroproliferative disorders. ROS generation in response to TGF-β1 stimulation is rapid and precedes PAI-1 induction; engagement of non-SMAD (e.g., EGFR, Src kinase, MAP kinases, p53) and SMAD2/3 pathways are both required for PAI-1 expression and are ROS-dependent. Recent findings suggest a novel role for p53 in TGF-β1-induced PAI-1 transcription that involves ROS generation and p53/SMAD interactions. Targeting ROS and ROS-activated cellular events is likely to have therapeutic implications in the management of fibrotic disorders, particularly in the context of prolonged TGF-β1 signaling.
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Affiliation(s)
- Rohan Samarakoon
- Center for Cell Biology and Cancer Research, Albany Medical College, 47 New Scotland Avenue, Albany, NY 12208, USA
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25
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Kim SS, Song SH, Kim IJ, Yang JY, Lee JG, Kwak IS, Kim YK. Clinical implication of urinary tubular markers in the early stage of nephropathy with type 2 diabetic patients. Diabetes Res Clin Pract 2012; 97:251-7. [PMID: 22440044 DOI: 10.1016/j.diabres.2012.02.019] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2011] [Revised: 02/15/2012] [Accepted: 02/23/2012] [Indexed: 12/14/2022]
Abstract
AIM The aim of this study was to evaluate the association of urinary tubular markers, interleukin-18 (IL-18) and angiotensinogen with albuminuria in early nephropathy of type 2 diabetics. METHODS Urine levels of tubular markers (kidney injury molecule [KIM]-1, neutrophil gelatinase-associated lipocalin [NGAL] and liver-type fatty acid-binding protein [L-FABP]), proinflammatory marker (IL-18), and a marker of intrarenal renin-angiotensin system (RAS) status (angiotensinogen) were determined in 118 patients with type 2 diabetes mellitus and 25 non-diabetic controls with estimated glomerular filtration rate (eGFR) ≥ 60 mL/min/1.73 m(2). RESULTS Urinary levels of KIM-1, NGAL, IL-18 and angiotensinogen were significantly higher in macroalbuminuria group compared with control and normo- and microalbuminuria groups but not significantly different between control and normoalbuminuria group. Urinary tubular markers were positively correlated with urinary IL-18 and angiotensinogen, respectively. The urinary albuminuria was correlated with all investigated urinary markers in univariate analysis. After adjusting for several clinical parameters, urinary KIM-1, NGAL and angiotensinogen were significantly associated with albuminuria. CONCLUSIONS The results of this study suggest that urinary tubular markers may be independently associated with albuminuria in the early stage of nephropathy in type 2 diabetics (eGFR ≥ 60 mL/min/1.73 m(2)) and may reflect inflammatory processing and the activation of the intrarenal RAS.
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Affiliation(s)
- Sang Soo Kim
- Department of Internal Medicine, Pusan National University Hospital, Busan, Republic of Korea
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26
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Guoguo S, Akaike T, Tao J, Qi C, Nong Z, Hui L. HGF-mediated inhibition of oxidative stress by 8-nitro-cGMP in high glucose-treated rat mesangial cells. Free Radic Res 2012; 46:1238-48. [PMID: 22690849 DOI: 10.3109/10715762.2012.701292] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Hepatocyte growth factor (HGF) is a potential therapeutic agent for diabetic nephropathy. The mechanisms for the renoprotective effect of HGF have been studied extensively, but antioxidant signalling of HGF in diabetic nephropathy is minimally understood. Our observations indicated that a nitrated guanine nucleotide, 8-nitroguanosine 3'5'-cyclic monophosphate (8-nitro-cGMP) diminished in high glucose (HG)-treated rat mesangial cells (RMC). However, HGF obviously lifted intracellular 8-nitro-cGMP level, which was accompanied by remarkably suppressed oxidative stress as evidenced by decreased reactive oxygen species and malondialdehyde levels and elevated glutathione level. Inhibitor of soluble guanylyl cyclase (sGC) NS-2028 and inhibitor of nitric oxide synthase (NOS) l-NMMA could block increased 8-nitro-cGMP level and repress oxidative stress by HGF. Accordingly, these two inhibitors abrogated HGF-induced nuclear accumulation of NF-E2 related factor 2 (Nrf2) and up-regulation of Nrf2 downstream glutamate-cysteine ligase catalytic subunit (GCLC) expression. In conclusion, HGF ameliorated HG-mediated oxidative stress in RMC at least in part by enhancing nitric oxide and subsequent 8-nitro-cGMP production.
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Affiliation(s)
- Shang Guoguo
- Department of Pathology, Shanghai Medical College, Fudan University, Shanghai, People's Republic of China
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