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Rachubik P, Rogacka D, Audzeyenka I, Typiak M, Wysocka M, Szrejder M, Lesner A, Piwkowska A. Role of lysosomes in insulin signaling and glucose uptake in cultured rat podocytes. Biochem Biophys Res Commun 2023; 679:145-159. [PMID: 37696068 DOI: 10.1016/j.bbrc.2023.09.012] [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: 07/07/2023] [Revised: 08/30/2023] [Accepted: 09/05/2023] [Indexed: 09/13/2023]
Abstract
Podocytes are sensitive to insulin, which governs the functional and structural integrity of podocytes that are essential for proper function of the glomerular filtration barrier. Lysosomes are acidic organelles that are implicated in regulation of the insulin signaling pathway. Cathepsin D (CTPD) and lysosome-associated membrane protein 1 (LAMP1) are major lysosomal proteins that reflect the functional state of lysosomes. However, the effect of insulin on lysosome activity and role of lysosomes in the regulation of insulin-dependent glucose uptake in podocytes are unknown. Our studies showed that the short-term incubation of podocytes with insulin decreased LAMP1 and CTPD mRNA levels. Insulin and bafilomycin A1 reduced both the amounts of LAMP1 and CTPD proteins and activity of CTPD, which were associated with a decrease in the fluorescence intensity of lysosomes that were labeled with LysoTracker. Bafilomycin A1 inhibited insulin-dependent endocytosis of the insulin receptor and increased the amounts of the insulin receptor and glucose transporter 4 on the cell surface of podocytes. Bafilomycin A1 also inhibited insulin-dependent glucose uptake despite an increase in the amount of glucose transporter 4 in the plasma membrane of podocytes. These results suggest that lysosomes are signaling hubs that may be involved in the coupling of insulin signaling with the regulation of glucose uptake in podocytes. The dysregulation of this mechanism can lead to the dysfunction of podocytes and development of insulin resistance.
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Affiliation(s)
- Patrycja Rachubik
- Laboratory of Molecular and Cellular Nephrology, Mossakowski Medical Research Institute, Polish Academy of Sciences, Wita Stwosza 63 St, Gdansk, 80-308, Poland.
| | - Dorota Rogacka
- Laboratory of Molecular and Cellular Nephrology, Mossakowski Medical Research Institute, Polish Academy of Sciences, Wita Stwosza 63 St, Gdansk, 80-308, Poland; Faculty of Chemistry, University of Gdansk, Wita Stwosza 63 St, Gdansk, 80-308, Poland.
| | - Irena Audzeyenka
- Laboratory of Molecular and Cellular Nephrology, Mossakowski Medical Research Institute, Polish Academy of Sciences, Wita Stwosza 63 St, Gdansk, 80-308, Poland; Faculty of Chemistry, University of Gdansk, Wita Stwosza 63 St, Gdansk, 80-308, Poland.
| | - Marlena Typiak
- Department of General and Medical Biochemistry, Faculty of Biology, University of Gdansk, Wita Stwosza 59 St, Gdansk, 80-308, Poland.
| | - Magdalena Wysocka
- Faculty of Chemistry, University of Gdansk, Wita Stwosza 63 St, Gdansk, 80-308, Poland.
| | - Maria Szrejder
- Laboratory of Molecular and Cellular Nephrology, Mossakowski Medical Research Institute, Polish Academy of Sciences, Wita Stwosza 63 St, Gdansk, 80-308, Poland.
| | - Adam Lesner
- Faculty of Chemistry, University of Gdansk, Wita Stwosza 63 St, Gdansk, 80-308, Poland.
| | - Agnieszka Piwkowska
- Laboratory of Molecular and Cellular Nephrology, Mossakowski Medical Research Institute, Polish Academy of Sciences, Wita Stwosza 63 St, Gdansk, 80-308, Poland; Faculty of Chemistry, University of Gdansk, Wita Stwosza 63 St, Gdansk, 80-308, Poland.
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Juin SK, Ouseph R, Gondim DD, Jala VR, Sen U. Diabetic Nephropathy and Gaseous Modulators. Antioxidants (Basel) 2023; 12:antiox12051088. [PMID: 37237955 DOI: 10.3390/antiox12051088] [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: 03/07/2023] [Revised: 05/05/2023] [Accepted: 05/08/2023] [Indexed: 05/28/2023] Open
Abstract
Diabetic nephropathy (DN) remains the leading cause of vascular morbidity and mortality in diabetes patients. Despite the progress in understanding the diabetic disease process and advanced management of nephropathy, a number of patients still progress to end-stage renal disease (ESRD). The underlying mechanism still needs to be clarified. Gaseous signaling molecules, so-called gasotransmitters, such as nitric oxide (NO), carbon monoxide (CO), and hydrogen sulfide (H2S), have been shown to play an essential role in the development, progression, and ramification of DN depending on their availability and physiological actions. Although the studies on gasotransmitter regulations of DN are still emerging, the evidence revealed an aberrant level of gasotransmitters in patients with diabetes. In studies, different gasotransmitter donors have been implicated in ameliorating diabetic renal dysfunction. In this perspective, we summarized an overview of the recent advances in the physiological relevance of the gaseous molecules and their multifaceted interaction with other potential factors, such as extracellular matrix (ECM), in the severity modulation of DN. Moreover, the perspective of the present review highlights the possible therapeutic interventions of gasotransmitters in ameliorating this dreaded disease.
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Affiliation(s)
- Subir Kumar Juin
- Department of Physiology, University of Louisville School of Medicine, Louisville, KY 40202, USA
- Department of Microbiology & Immunology, Brown Cancer Center, Center for Microbiomics, Inflammation and Pathogenicity, University of Louisville School of Medicine, Louisville, KY 40202, USA
| | - Rosemary Ouseph
- Division of Nephrology & Hypertension, University of Louisville School of Medicine, Louisville, KY 40202, USA
| | - Dibson Dibe Gondim
- Department of Pathology, University of Louisville School of Medicine, Louisville, KY 40202, USA
| | - Venkatakrishna Rao Jala
- Department of Microbiology & Immunology, Brown Cancer Center, Center for Microbiomics, Inflammation and Pathogenicity, University of Louisville School of Medicine, Louisville, KY 40202, USA
| | - Utpal Sen
- Department of Physiology, University of Louisville School of Medicine, Louisville, KY 40202, USA
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Sawada A, Kawanishi K, Igarashi Y, Taneda S, Hattori M, Ishida H, Tanabe K, Koike J, Honda K, Nagashima Y, Nitta K. Overexpression of Plasmalemmal Vesicle-Associated Protein-1 Reflects Glomerular Endothelial Injury in Cases of Proliferative Glomerulonephritis with Monoclonal IgG Deposits. Kidney Int Rep 2022; 8:151-163. [PMID: 36644361 PMCID: PMC9831946 DOI: 10.1016/j.ekir.2022.10.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 09/30/2022] [Accepted: 10/10/2022] [Indexed: 11/07/2022] Open
Abstract
Introduction Proliferative glomerulonephritis with monoclonal IgG deposits (PGNMID) occasionally presents refractory nephrotic syndrome resulting in poor renal prognosis, but its etiology is not fully elucidated. Given that glomerular endothelial cell (GEC) stress or damage may lead to podocytopathy and subsequent proteinuria, as in thrombotic microangiopathy (TMA), diabetic kidney disease, and focal segmental glomerulosclerosis, we investigated the evidence of glomerular endothelial injury by evaluating the expression of plasmalemmal vesicle-associated protein-1 (PV-1), a component of caveolae in the cases of PGNMID. Methods We measured the immunofluorescent PV-1 intensities of 23 PGNMID cases and compared with those of primary membranoproliferative glomerulonephritis (MPGN) (n = 5) and IgA nephropathy (IgAN) (n = 54) cases. PV-1 localization was evaluated with Caveolin-1, and CD31 staining, and the ultrastructural analysis was performed using a low-vacuum scanning electron microscope (LVSEM). To check the association of podocyte injury, we also conducted 8-oxoguanine and Wilms tumor 1 (WT1) double stain. We then evaluated PV-1 expression in other glomerulitis and glomerulopathy such as lupus nephritis and minimal change disease. Results The intensity of glomerular PV-1 expression in PGNMID is significantly higher than that in the other glomerular diseases, although the intensity is not associated with clinical outcomes such as urinary protein levels or renal prognosis. Immunostaining and LVSEM analysis revealed that glomerular PV-1 expression is localized in GECs in PGNMID. 8-oxoguanine accumulation was detected in WT1-positive podocytes but not in PV-1-expressing GECs, suggesting GEC-derived podocyte injury in PGNMID. Conclusion PV-1 overexpression reflects glomerular endothelial injury, which could be associated with podocyte oxidative stress in PGNMID cases.
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Affiliation(s)
- Anri Sawada
- Department of Analytic Human Pathology, Nippon Medical School, Tokyo, Japan,Department of Surgical Pathology, Tokyo Women’s Medical University Hospital, Tokyo, Japan
| | - Kunio Kawanishi
- Department of Experimental Pathology, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan,Correspondence: Kunio Kawanishi or Anri Sawada, Department of Experimental Pathology, Faculty of Medicine, University of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki Japan.
| | - Yuto Igarashi
- Department of Urology, Tokyo Women’s Medical University, Tokyo, Japan
| | - Sekiko Taneda
- Department of Surgical Pathology, Tokyo Women’s Medical University Hospital, Tokyo, Japan
| | - Motoshi Hattori
- Department of Pediatric Nephrology, Tokyo Women’s Medical University, Tokyo, Japan
| | - Hideki Ishida
- Department of Urology, Tokyo Women’s Medical University, Tokyo, Japan,Department of Organ Transplant Medicine, Tokyo Women’s Medical University, Tokyo, Japan
| | - Kazunari Tanabe
- Department of Urology, Tokyo Women’s Medical University, Tokyo, Japan
| | - Junki Koike
- Department of Pathology, St. Marianna University School of Medicine, Kawasaki, Kanagawa, Japan
| | - Kazuho Honda
- Department of Anatomy, Showa University School of Medicine, Tokyo, Japan
| | - Yoji Nagashima
- Department of Surgical Pathology, Tokyo Women’s Medical University Hospital, Tokyo, Japan
| | - Kosaku Nitta
- Department of Nephrology, Tokyo Women’s Medical University, Tokyo, Japan
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Luo S, Yang M, Zhao H, Han Y, Jiang N, Yang J, Chen W, Li C, Liu Y, Zhao C, Sun L. Caveolin-1 Regulates Cellular Metabolism: A Potential Therapeutic Target in Kidney Disease. Front Pharmacol 2021; 12:768100. [PMID: 34955837 PMCID: PMC8703113 DOI: 10.3389/fphar.2021.768100] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 11/08/2021] [Indexed: 01/09/2023] Open
Abstract
The kidney is an energy-consuming organ, and cellular metabolism plays an indispensable role in kidney-related diseases. Caveolin-1 (Cav-1), a multifunctional membrane protein, is the main component of caveolae on the plasma membrane. Caveolae are represented by tiny invaginations that are abundant on the plasma membrane and that serve as a platform to regulate cellular endocytosis, stress responses, and signal transduction. However, caveolae have received increasing attention as a metabolic platform that mediates the endocytosis of albumin, cholesterol, and glucose, participates in cellular metabolic reprogramming and is involved in the progression of kidney disease. It is worth noting that caveolae mainly depend on Cav-1 to perform the abovementioned cellular functions. Furthermore, the mechanism by which Cav-1 regulates cellular metabolism and participates in the pathophysiology of kidney diseases has not been completely elucidated. In this review, we introduce the structure and function of Cav-1 and its functions in regulating cellular metabolism, autophagy, and oxidative stress, focusing on the relationship between Cav-1 in cellular metabolism and kidney disease; in addition, Cav-1 that serves as a potential therapeutic target for treatment of kidney disease is also described.
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Affiliation(s)
- Shilu Luo
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, China.,Hunan Key Laboratory of Kidney Disease and Blood Purification, Changsha, China
| | - Ming Yang
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, China.,Hunan Key Laboratory of Kidney Disease and Blood Purification, Changsha, China
| | - Hao Zhao
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, China.,Hunan Key Laboratory of Kidney Disease and Blood Purification, Changsha, China
| | - Yachun Han
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, China.,Hunan Key Laboratory of Kidney Disease and Blood Purification, Changsha, China
| | - Na Jiang
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, China.,Hunan Key Laboratory of Kidney Disease and Blood Purification, Changsha, China
| | - Jinfei Yang
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, China.,Hunan Key Laboratory of Kidney Disease and Blood Purification, Changsha, China
| | - Wei Chen
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, China.,Hunan Key Laboratory of Kidney Disease and Blood Purification, Changsha, China
| | - Chenrui Li
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, China.,Hunan Key Laboratory of Kidney Disease and Blood Purification, Changsha, China
| | - Yan Liu
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, China.,Hunan Key Laboratory of Kidney Disease and Blood Purification, Changsha, China
| | - Chanyue Zhao
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, China.,Hunan Key Laboratory of Kidney Disease and Blood Purification, Changsha, China
| | - Lin Sun
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, China.,Hunan Key Laboratory of Kidney Disease and Blood Purification, Changsha, China
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Caveolin-1 in Kidney Chronic Antibody-Mediated Rejection: An Integrated Immunohistochemical and Transcriptomic Analysis Based on the Banff Human Organ Transplant (B-HOT) Gene Panel. Biomedicines 2021; 9:biomedicines9101318. [PMID: 34680435 PMCID: PMC8533527 DOI: 10.3390/biomedicines9101318] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 09/13/2021] [Accepted: 09/22/2021] [Indexed: 02/07/2023] Open
Abstract
Caveolin-1 overexpression has previously been reported as a marker of endothelial injury in kidney chronic antibody-mediated rejection (c-ABMR), but conclusive evidence supporting its use for daily diagnostic practice is missing. This study aims to evaluate if Caveolin-1 can be considered an immunohistochemical surrogate marker of c-ABMR. Caveolin-1 expression was analyzed in a selected series of 22 c-ABMR samples and 11 controls. Caveolin-1 immunohistochemistry proved positive in peritubular and glomerular capillaries of c-ABMR specimens, irrespective of C4d status whereas all controls were negative. Multiplex gene expression profiling in c-ABMR cases confirmed Caveolin-1 overexpression and identified additional genes (n = 220) and pathways, including MHC Class II antigen presentation and Type II interferon signaling. No differences in terms of gene expression (including Caveolin-1 gene) were observed according to C4d status. Conversely, immune cell signatures showed a NK-cell prevalence in C4d-negative samples compared with a B-cell predominance in C4d-positive cases, a finding confirmed by immunohistochemical assessment. Finally, differentially expressed genes were observed between c-ABMR and controls in pathways associated with Caveolin-1 functions (angiogenesis, cell metabolism and cell–ECM interaction). Based on our findings, Caveolin-1 resulted as a key player in c-ABMR, supporting its role as a marker of this condition irrespective of C4d status.
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Chen YH, Lin WW, Liu CS, Su SL. H2O2 induces caveolin‑1 degradation and impaired mitochondrial function in E11 podocytes. Mol Med Rep 2017; 16:7841-7847. [PMID: 28944844 DOI: 10.3892/mmr.2017.7497] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Accepted: 06/28/2017] [Indexed: 11/05/2022] Open
Abstract
Increased intercellular reactive oxygen species (ROS) levels are the major cause of podocyte injury with proteinuria. Caveolin‑1 (CAV‑1) is an essential protein component of caveolae. CAV‑1 participates in signal transduction and endocytic trafficking. Recent research has indicated that CAV‑1 regulates oxidative stress‑induced pathways. The present study used hydrogen peroxide (H2O2) at nontoxic concentrations to elevate the level of ROS in E11 podocytes. Treatment with 500 and 1,000 µM H2O2 for 1 h significantly reduced CAV‑1 expression levels. Simultaneously, the treatment significantly reduced the expression of the antioxidant enzymes glutamine‑cysteine ligase catalytic subunit, superoxide dismutase 2 and catalase. To determine the role of CAV‑1 in mediating oxidative stress, E11 podocytes were administered antenapedia‑CAV‑1 (AP‑CAV‑1) peptide for 48 h. The AP‑CAV‑1 treatment enhanced CAV‑1 expression and inhibited cyclophilin A expression, thus reducing ROS‑induced inflammation. Moreover, CAV‑1 protected against H2O2‑induced oxidative stress responses by enhancing the expression of antioxidant enzymes. Furthermore, CAV‑1 attenuated H2O2‑induced changes oxidative phosphorylation, and the expression of optic atrophy 1 and translocase of the inner membrane 23, as well as preserving mitochondrial function. CAV‑1 treatment significantly suppressed apoptosis, as indicated by a higher B‑cell lymphoma 2/BCL2‑associated X protein ratio. Therefore, enhancing the expression of CAV‑1 may be an important therapeutic consideration in treating podocyte injury.
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Affiliation(s)
- Ya-Hui Chen
- Vascular and Genomic Center, Changhua Christian Hospital, Changhua 50094, P.R. China
| | - Wei-Wen Lin
- Division of Cardiovascular Center, Department of Internal Medicine, Taichung Veterans General Hospital, Taichung 40705, P.R. China
| | - Chin-San Liu
- Vascular and Genomic Center, Changhua Christian Hospital, Changhua 50094, P.R. China
| | - Shih-Li Su
- Vascular and Genomic Center, Changhua Christian Hospital, Changhua 50094, P.R. China
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Abstract
In recent years, it has become apparent that parietal epithelial cells (PECs) play an important role within the renal glomerulus, in particular in diseased conditions. In this review, we examine current knowledge about the role of PECs and their interactions with podocytes in development and under physiological conditions. A particular focus is on the crucial role of PECs and podocytes in two major glomerular disease entities. In rapidly progressive glomerulonephritis, PECs and podocytes proliferate and obstruct the tubular outlet, resulting in loss of the affected nephron. In focal and segmental glomerulosclerosis, PECs become activated and invade a segment of the glomerular tuft via an adhesion. From this entry site, activated PECs displace podocytes and deposit matrix. Thus, activated PECs are involved in inflammatory as well as degenerative glomerular diseases, which both can lead to irreversible loss of renal function.
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Affiliation(s)
- Bart Smeets
- Division of Nephrology and Immunology, Rheinisch-Westfaelische Technische Hochschule, Aachen University Hospital, Aachen, Germany
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Dariusz S, Agnieszka M, Elzbieta R, Danuta ON, Maciej Z, Piotr D, Nowicki M. A potency of plasminogen activation system in long-term prognosis of endometrial cancer: a pilot study. Eur J Obstet Gynecol Reprod Biol 2012; 163:193-9. [PMID: 22525297 DOI: 10.1016/j.ejogrb.2012.03.031] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2011] [Revised: 02/07/2012] [Accepted: 03/07/2012] [Indexed: 11/19/2022]
Abstract
OBJECTIVE Plasminogen activators released from cancer cells lead to degradation of basement membrane proteins and extracellular matrix, and facilitate cancer cell invasion into surrounding tissues and the blood stream. The aim of this study was to evaluate a complex tissue immunohistochemical expression of the plasminogen activation system--urokinase-type plasminogen activator (uPA) and its receptor (uPAR), tissue-type plasminogen activator (tPA) and plasminogen activator inhibitor (PAI)-1--in endometrial cancer, and to correlate obtained results with disease progression and course. STUDY DESIGN The study group was composed of 100 patients classified in three sub-groups according to the FIGO 2010 tumour stratification (G1=70, G2=19, G3=11). Expression of uPA, tPA, uPAR and PAI-1 was examined by means of immunohistochemical staining. RESULTS Immunohistochemical expressions of all the studied markers did not differ between G1 and G2 patients. However, G3 subjects were found to have a significantly lower expression of uPA, PAI-1 and tPA. In addition, the patients who survived were found to be PAI-1 negative, while study participants with an unfavourable disease course were PAI-1 positive. CONCLUSIONS A significantly higher immunohistochemical expression of PAI-1 was found to correlate with shorter relapse-free and overall survival in patients classified as stages IB and II of endometrial cancer.
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Affiliation(s)
- Samulak Dariusz
- Department of Surgical Gynaecology, University of Medical Sciences in Poznan, Poland
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Moriyama T, Tsuruta Y, Shimizu A, Itabashi M, Takei T, Horita S, Uchida K, Nitta K. The significance of caveolae in the glomeruli in glomerular disease. J Clin Pathol 2011; 64:504-9. [PMID: 21450752 DOI: 10.1136/jcp.2010.087023] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
AIMS The aim of this study was to demonstrate expression of cell membrane invagination 'caveolae' in glomeruli and to correlate this with functional and structural characteristics of the human glomerular diseases. METHODS The expression of caveolin-1 (Cav-1), which is the main component of caveolae, was examined in the glomeruli, and the relationship between Cav-1 expression and pathological and clinical findings was determined in 99 patients with glomerular disease and in 50 renal transplantation donors as controls. RESULTS Cav-1 was expressed very weakly in the controls, and the area of Cav-1 expression relative to the total glomerular area was 0.57±0.65%. However, the area of Cav-1 expression was significantly larger in each glomerular disease (IgA nephropathy, 1.05±1.36%, p<0.05; crescent glomerulonephritis, 1.86±1.19%, p<0.001; minimal change disease, 2.38±1.24%, p<0.001; focal segmental glomerulosclerosis, 2.88±2.05%, p<0.01; membranous nephritis, 4.27±2.95%, p<0.001; membranoproliferative glomerulonephritis, 4.49±3.15%, p<0.001; and diabetic nephropathy, 2.45±1.52%, p<0.001; compared with the controls. Cav-1 expression was significantly decreased in glomerular disease treated with steroids. Co-localisation of Cav-1 and the endothelial marker 'pathologische anatomie leiden-endothelium' was prominent in an immunofluorescence study, and caveolae on the glomerular endothelial cells were observed in electron microscopy. CONCLUSIONS The expression of Cav-1 was significantly increased in the glomeruli of patients with glomerular disease, and it was related to urinary albumin excretion. Cav-1 expression and caveolae were observed in glomerular endothelial cells. It is hypothesised that they play a role in the recovery phase of capillary injury or endocytosis of albumin into endothelial cells. Basic research should be performed to elucidate the role played by Cav-1 and caveolae.
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Affiliation(s)
- Takahito Moriyama
- Department of Medicine, Kidney Center, Tokyo Women's Medical University, Tokyo, Japan.
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Borza CM, Chen X, Mathew S, Mont S, Sanders CR, Zent R, Pozzi A. Integrin {alpha}1{beta}1 promotes caveolin-1 dephosphorylation by activating T cell protein-tyrosine phosphatase. J Biol Chem 2010; 285:40114-24. [PMID: 20940300 DOI: 10.1074/jbc.m110.156729] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Integrin α1β1 is a collagen receptor that down-regulates collagen and reactive oxygen species (ROS) production, and mice lacking this receptor show increased ROS levels and exacerbated glomerular sclerosis following injury. Caveolin-1 (Cav-1) is a multifunctional protein that is tyrosine-phosphorylated in response to injury and has been implicated in ROS-mediated injury. Cav-1 interacts with integrins, and integrin α1β1 binds/activates T cell protein-tyrosine phosphatase (TCPTP), which is homologous to the tyrosine phosphatase PTP1B known to dephosphorylate Cav-1. In this study, we analyzed whether phosphorylated Cav-1 (pCav-1) is a substrate of TCPTP and if integrin α1β1 is essential for promoting TCPTP-mediated Cav-1 dephosphorylation. We found that Cav-1 phosphorylation is significantly higher in cells lacking integrin α1β1 at base line and following oxidative stress. Overexpression of TCPTP leads to reduced pCav-1 levels only in cells expressing integrin α1β1. Using solid phase binding assays, we demonstrated that 1) purified Cav-1 directly interacts with TCPTP and the integrin α1 subunit, 2) pCav-1 is a substrate of TCPTP, and 3) TCPTP-mediated Cav-1 dephosphorylation is highly increased by the addition of purified integrin α1β1 or an integrin α1 cytoplasmic peptide to which TCPTP has been shown to bind. Thus, our results demonstrate that pCav-1 is a new substrate of TCPTP and that integrin α1β1 acts as a negative regulator of Cav-1 phosphorylation by activating TCPTP. This could explain the protective function of integrin α1β1 in oxidative stress-mediated damage and why integrin α1-null mice are more susceptible to fibrosis following injury.
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Affiliation(s)
- Corina M Borza
- Department of Medicine, Division of Nephrology, Vanderbilt University, Nashville, Tennessee 37212-2372, USA.
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Smeets B, Angelotti ML, Rizzo P, Dijkman H, Lazzeri E, Mooren F, Ballerini L, Parente E, Sagrinati C, Mazzinghi B, Ronconi E, Becherucci F, Benigni A, Steenbergen E, Lasagni L, Remuzzi G, Wetzels J, Romagnani P. Renal progenitor cells contribute to hyperplastic lesions of podocytopathies and crescentic glomerulonephritis. J Am Soc Nephrol 2009; 20:2593-603. [PMID: 19875807 DOI: 10.1681/asn.2009020132] [Citation(s) in RCA: 146] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Glomerular injury can involve excessive proliferation of glomerular epithelial cells, resulting in crescent formation and obliteration of Bowman's space. The origin of these hyperplastic epithelial cells in different glomerular disorders is controversial. Renal progenitors localized to the inner surface of Bowman's capsule can regenerate podocytes, but whether dysregulated proliferation of these progenitors contributes to crescent formation is unknown. In this study, we used confocal microscopy, laser capture microdissection, and real-time quantitative reverse transcriptase-PCR to demonstrate that hypercellular lesions of different podocytopathies and crescentic glomerulonephritis consist of three distinct populations: CD133(+)CD24(+)podocalyxin (PDX)(-)nestin(-) renal progenitors, CD133(+)CD24(+)PDX(+)nestin(+) transitional cells, and CD133(-)CD24(-)PDX(+)nestin(+) differentiated podocytes. In addition, TGF-beta induced CD133(+)CD24(+) progenitors to produce extracellular matrix, and these were the only cells to express the proliferation marker Ki67. Taken together, these results suggest that glomerular hyperplastic lesions derive from the proliferation of renal progenitors at different stages of their differentiation toward mature podocytes, providing an explanation for the pathogenesis of hyperplastic lesions in podocytopathies and crescentic glomerulonephritis.
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Affiliation(s)
- Bart Smeets
- Department of Pathology, Radboud University Nijmegen Medical Center, Geert Grooteplein 24, Nijmegen, Netherlands.
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Abstract
PURPOSE OF REVIEW Substantial evidence documents the key role of lipid (membrane) rafts and caveolae as microdomains that concentrate a wide variety of receptors and postreceptor components regulated by hormones, neurotransmitters and growth factors. RECENT FINDINGS Recent data document that these microdomains are important in regulating vascular endothelial and smooth muscle cells and renal epithelial cells, and particularly in signal transduction across the plasma membrane. SUMMARY Raft/caveolae domains are cellular regions, including in cardiovascular and renal epithelial cells, which organize a large number of signal transduction components, thereby providing spatially and temporally efficient regulation of cell function.
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Current World Literature. Curr Opin Nephrol Hypertens 2009; 18:91-3. [DOI: 10.1097/mnh.0b013e32831fd875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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14
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Yamamoto I, Horita S, Takahashi T, Kobayashi A, Toki D, Tanabe K, Hattori M, Teraoka S, Aita K, Nagata M, Yamaguchi Y. Caveolin-1 expression is a distinct feature of chronic rejection-induced transplant capillaropathy. Am J Transplant 2008; 8:2627-35. [PMID: 19032226 DOI: 10.1111/j.1600-6143.2008.02421.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Peritubular capillary basement membrane multilayering (PTCBMML) is a pathological landmark of chronic rejection-induced transplant capillaropathy (TC), but its cellular mechanisms are not fully understood. We observed de novo caveolae formation in endothelial cells in TC under electron microscopy. To examine the role of caveolae and their structural components in TC, biopsy samples from cases of chronic rejection were double-immunostained for Caveolin-1 (Cav-1) and Pathologische Anatomie Leiden-endothelium (PAL-E; a marker of peritubular capillary [PC]). Thirty-two cases of chronic rejection (group I) were compared with 18 cases of interstitial fibrosis and tubular atrophy with no evidence of any specific etiology (IF/TA; group II) and eight cases of peritubular capillaritis (group III). The Cav-1/PAL-E immunoreactivities in groups I-III (%Cav-1/PAL-E) were 41.8+/-23.1%, 8.1+/-7.3% (p < 0.01 vs. group I) and 12.7+/-7.4% (p < 0.01 vs. group I), respectively. Furthermore, multiple linear regression models demonstrated that %Cav-1/PAL-E was independently associated with the PTCBMML grade and reduced PC number. No correlation was observed between %Cav-1/PAL-E and PC C4d deposition in group I. We conclude that de novo caveolae formation in PC endothelia is involved in TC in chronic rejection.
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Affiliation(s)
- I Yamamoto
- Division of Kidney and Hypertension, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan.
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Skoberne A, Konieczny A, Schiffer M. Glomerular epithelial cells in the urine: what has to be done to make them worthwhile? Am J Physiol Renal Physiol 2008; 296:F230-41. [PMID: 18842819 DOI: 10.1152/ajprenal.90507.2008] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The significance of the native urine sediment in the differential of glomerular diseases needs no further comment. However, the question arises whether it could be useful to develop a more specific diagnostic approach to identify the origin of renal epithelial cells that can be detected in the urine sediments as well. Especially the detection of podocytes in the urine could be a valuable noninvasive method to get information about the disease activity or disease type and could be used as a follow-up after a biopsy in an outpatient setting. So far, there are only a few studies that analyzed the clinical relevance of renal epithelial cells in the urine systematically or prospectively. The reason for this could be the nature of the material since it will remain unclear whether detachment and changes in the urine milieu have a direct effect on the expression of marker proteins on the detected cells. Dedifferentiation or transdifferentiation of cells that goes along with changed marker expression is certainly also part of the underlying disease process. This review summarizes the available information on marker proteins that have been successfully used in the diagnostic of "podocytes" in the urine. Furthermore, it gives an overview of marker expression on podocytes in situ in development and disease and examines the role of glomerular epithelial shedding in the urine at the interface of basic science and clinical medicine.
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Affiliation(s)
- Andrej Skoberne
- Division of Nephrology, University Medical Centre Ljubljana, Ljublijana, Slovenia, Germany
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