1
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Bokhari SMZ, Hamar P. Vascular Endothelial Growth Factor-D (VEGF-D): An Angiogenesis Bypass in Malignant Tumors. Int J Mol Sci 2023; 24:13317. [PMID: 37686121 PMCID: PMC10487419 DOI: 10.3390/ijms241713317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 08/17/2023] [Accepted: 08/23/2023] [Indexed: 09/10/2023] Open
Abstract
Vascular endothelial growth factors (VEGFs) are the key regulators of vasculogenesis in normal and oncological development. VEGF-A is the most studied angiogenic factor secreted by malignant tumor cells under hypoxic and inflammatory stress, which made VEGF-A a rational target for anticancer therapy. However, inhibition of VEGF-A by monoclonal antibody drugs led to the upregulation of VEGF-D. VEGF-D was primarily described as a lymphangiogenic factor; however, VEGF-D's blood angiogenic potential comparable to VEGF-A has already been demonstrated in glioblastoma and colorectal carcinoma. These findings suggested a role for VEGF-D in facilitating malignant tumor growth by bypassing the anti-VEGF-A antiangiogenic therapy. Owing to its high mitogenic ability, higher affinity for VEGFR-2, and higher expression in cancer, VEGF-D might even be a stronger angiogenic driver and, hence, a better therapeutic target than VEGF-A. In this review, we summarized the angiogenic role of VEGF-D in blood vasculogenesis and its targetability as an antiangiogenic therapy in cancer.
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Affiliation(s)
| | - Peter Hamar
- Institute of Translational Medicine, Semmelweis University, 1094 Budapest, Hungary;
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2
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Woźniak M, Pastuch-Gawołek G, Makuch S, Wiśniewski J, Krenács T, Hamar P, Gamian A, Szeja W, Szkudlarek D, Krawczyk M, Agrawal S. In Vitro and In Vivo Efficacy of a Novel Glucose-Methotrexate Conjugate in Targeted Cancer Treatment. Int J Mol Sci 2021; 22:ijms22041748. [PMID: 33572433 PMCID: PMC7916191 DOI: 10.3390/ijms22041748] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 02/03/2021] [Accepted: 02/04/2021] [Indexed: 12/01/2022] Open
Abstract
Methotrexate (MTX) is a commonly used antimetabolite, which inhibits folate and DNA synthesis to be effective in the treatment of various malignancies. However, MTX therapy is hindered by the lack of target tumor selectivity. We have designed, synthesized and evaluated a novel glucose–methotrexate conjugate (GLU–MTX) both in vitro and in vivo, in which a cleavable linkage allows intracellular MTX release after selective uptake through glucose transporter−1 (GLUT1). GLU–MTX inhibited the growth of colorectal (DLD-1), breast (MCF-7) and lung (A427) adenocarcinomas, squamous cell carcinoma (SCC-25), osteosarcoma (MG63) cell lines, but not in WI-38 healthy fibroblasts. In tumor cells, GLU–MTX uptake increased 17-fold compared to unconjugated MTX. 4,6-O-ethylidene-α-D-glucose (EDG), a GLUT1 inhibitor, significantly interfered with GLU–MTX induced growth inhibition, suggesting a glucose-mediated drug uptake. Glu-MTX also caused significant tumor growth delay in vivo in breast cancer-bearing mice. These results show that our GLUT-MTX conjugate can be selectively uptake by a range of tumor cells to cause their significant growth inhibition in vitro, which was also confirmed in a breast cancer model in vivo. GLUT1 inhibitor EDG interfered with these effects verifying the selective drug uptake. Accordingly, GLU–MTX offers a considerable tumor selectivity and may offer cancer growth inhibition at reduced toxicity.
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Affiliation(s)
- Marta Woźniak
- Department of Pathology, Wroclaw Medical University, 50-367 Wroclaw, Poland; (M.W.); (S.M.); (D.S.)
| | - Gabriela Pastuch-Gawołek
- Department of Organic Chemistry, Bioorganic Chemistry and Biotechnology, Faculty of Chemistry, 44-100 Gliwice, Poland; (G.P.-G.); (W.S.)
- Biotechnology Centre, Silesian University of Technology, 44-100 Gliwice, Poland
| | - Sebastian Makuch
- Department of Pathology, Wroclaw Medical University, 50-367 Wroclaw, Poland; (M.W.); (S.M.); (D.S.)
| | - Jerzy Wiśniewski
- Department of Medical Biochemistry, Wroclaw Medical University, 50-367 Wroclaw, Poland;
- Department of Immunology of Infectious Diseases, Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, 53-114 Wroclaw, Poland;
| | - Tibor Krenács
- Department of Pathology and Experimental Cancer Research, Semmelweis University, 1085 Budapest, Hungary;
| | - Peter Hamar
- Institute of Translational Medicine, Semmelweis University, 1085 Budapest, Hungary;
| | - Andrzej Gamian
- Department of Immunology of Infectious Diseases, Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, 53-114 Wroclaw, Poland;
| | - Wiesław Szeja
- Department of Organic Chemistry, Bioorganic Chemistry and Biotechnology, Faculty of Chemistry, 44-100 Gliwice, Poland; (G.P.-G.); (W.S.)
| | - Danuta Szkudlarek
- Department of Pathology, Wroclaw Medical University, 50-367 Wroclaw, Poland; (M.W.); (S.M.); (D.S.)
| | - Monika Krawczyk
- Department of Organic Chemistry, Bioorganic Chemistry and Biotechnology, Faculty of Chemistry, 44-100 Gliwice, Poland; (G.P.-G.); (W.S.)
- Biotechnology Centre, Silesian University of Technology, 44-100 Gliwice, Poland
- Correspondence: (M.K.); (S.A.)
| | - Siddarth Agrawal
- Department of Pathology, Wroclaw Medical University, 50-367 Wroclaw, Poland; (M.W.); (S.M.); (D.S.)
- Department and Clinic of Internal Medicine, Occupational Diseases, Hypertension and Clinical Oncology, Wroclaw Medical University, 50-367 Wroclaw, Poland
- Correspondence: (M.K.); (S.A.)
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3
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Krenacs T, Meggyeshazi N, Forika G, Kiss E, Hamar P, Szekely T, Vancsik T. Modulated Electro-Hyperthermia-Induced Tumor Damage Mechanisms Revealed in Cancer Models. Int J Mol Sci 2020; 21:E6270. [PMID: 32872532 PMCID: PMC7504298 DOI: 10.3390/ijms21176270] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 08/22/2020] [Accepted: 08/24/2020] [Indexed: 12/18/2022] Open
Abstract
The benefits of high-fever range hyperthermia have been utilized in medicine from the Ancient Greek culture to the present day. Amplitude-modulated electro-hyperthermia, induced by a 13.56 MHz radiofrequency current (mEHT, or Oncothermia), has been an emerging means of delivering loco-regional clinical hyperthermia as a complementary of radiation-, chemo-, and molecular targeted oncotherapy. This unique treatment exploits the metabolic shift in cancer, resulting in elevated oxidative glycolysis (Warburg effect), ion concentration, and electric conductivity. These promote the enrichment of electric fields and induce heat (controlled at 42 °C), as well as ion fluxes and disequilibrium through tumor cell membrane channels. By now, accumulating preclinical studies using in vitro and in vivo models of different cancer types have revealed details of the mechanism and molecular background of the oncoreductive effects of mEHT monotherapy. These include the induction of DNA double-strand breaks, irreversible heath and cell stress, and programmed cells death; the upregulation of molecular chaperones and damage (DAMP) signaling, which may contribute to a secondary immunogenic tumor cell death. In combination therapies, mEHT proved to be a good chemosensitizer through increasing drug uptake and tumor reductive effects, as well as a good radiosensitizer by downregulating hypoxia-related target genes. Recently, immune stimulation or intratumoral antigen-presenting dendritic cell injection have been able to extend the impact of local mEHT into a systemic "abscopal" effect. The complex network of pathways emerging from the published mEHT experiments has not been overviewed and arranged yet into a framework to reveal links between the pieces of the "puzzle". In this paper, we review the mEHT-related damage mechanisms published in tumor models, which may allow some geno-/phenotype treatment efficiency correlations to be exploited both in further research and for more rational clinical treatment planning when mEHT is involved in combination therapies.
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Affiliation(s)
- Tibor Krenacs
- Department of Pathology and Experimental Cancer Research, Semmelweis University, H-1085 Budapest, Hungary; (N.M.); (G.F.); (T.S.)
| | - Nora Meggyeshazi
- Department of Pathology and Experimental Cancer Research, Semmelweis University, H-1085 Budapest, Hungary; (N.M.); (G.F.); (T.S.)
| | - Gertrud Forika
- Department of Pathology and Experimental Cancer Research, Semmelweis University, H-1085 Budapest, Hungary; (N.M.); (G.F.); (T.S.)
| | - Eva Kiss
- Institute of Oncology at 1st Department of Internal Medicine, Semmelweis University, H-1083 Budapest, Hungary;
| | - Peter Hamar
- Institute of Translational Medicine, Semmelweis University, H-1094 Budapest, Hungary; (P.H.); (T.V.)
| | - Tamas Szekely
- Department of Pathology and Experimental Cancer Research, Semmelweis University, H-1085 Budapest, Hungary; (N.M.); (G.F.); (T.S.)
| | - Tamas Vancsik
- Institute of Translational Medicine, Semmelweis University, H-1094 Budapest, Hungary; (P.H.); (T.V.)
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4
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Bukosza EN, Kornauth C, Hummel K, Schachner H, Huttary N, Krieger S, Nöbauer K, Oszwald A, Razzazi Fazeli E, Kratochwill K, Aufricht C, Szénási G, Hamar P, Gebeshuber CA. ECM Characterization Reveals a Massive Activation of Acute Phase Response during FSGS. Int J Mol Sci 2020; 21:ijms21062095. [PMID: 32197499 PMCID: PMC7139641 DOI: 10.3390/ijms21062095] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Revised: 03/16/2020] [Accepted: 03/16/2020] [Indexed: 12/19/2022] Open
Abstract
The glomerular basement membrane (GBM) and extra-cellular matrix (ECM) are essential to maintain a functional interaction between the glomerular podocytes and the fenestrated endothelial cells in the formation of the slit diaphragm for the filtration of blood. Dysregulation of ECM homeostasis can cause Focal segmental glomerulosclerosis (FSGS). Despite this central role, alterations in ECM composition during FSGS have not been analyzed in detail yet. Here, we characterized the ECM proteome changes in miR-193a-overexpressing mice, which suffer from FSGS due to suppression of Wilms' tumor 1 (WT1). By mass spectrometry we identified a massive activation of the acute phase response, especially the complement and fibrinogen pathways. Several protease inhibitors (ITIH1, SERPINA1, SERPINA3) were also strongly increased. Complementary analysis of RNA expression data from both miR-193a mice and human FSGS patients identified additional candidate genes also mainly involved in the acute phase response. In total, we identified more than 60 dysregulated, ECM-associated genes with potential relevance for FSGS progression. Our comprehensive analysis of a murine FSGS model and translational comparison with human data offers novel targets for FSGS therapy.
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Affiliation(s)
- Eva Nora Bukosza
- Institute of Translational Medicine, Semmelweis University Budapest, Tűzoltó u 37-47, 1094 Budapest, Hungary; (E.N.B.); (G.S.); (P.H.)
- Clinical Institute for Pathology, Medical University Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria; (C.K.); (H.S.); (N.H.); (S.K.); (A.O.)
| | - Christoph Kornauth
- Clinical Institute for Pathology, Medical University Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria; (C.K.); (H.S.); (N.H.); (S.K.); (A.O.)
- Clinical Division of Hematology and Hemostaseology, Department of Internal Medicine I, Medical University Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria
| | - Karin Hummel
- Vetcore Facility for Research, University of Veterinary Medicine Vienna, Veterinärplatz 1, 1210 Vienna, Austria; (K.H.); (K.N.); (E.R.F.)
| | - Helga Schachner
- Clinical Institute for Pathology, Medical University Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria; (C.K.); (H.S.); (N.H.); (S.K.); (A.O.)
| | - Nicole Huttary
- Clinical Institute for Pathology, Medical University Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria; (C.K.); (H.S.); (N.H.); (S.K.); (A.O.)
| | - Sigurd Krieger
- Clinical Institute for Pathology, Medical University Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria; (C.K.); (H.S.); (N.H.); (S.K.); (A.O.)
| | - Katharina Nöbauer
- Vetcore Facility for Research, University of Veterinary Medicine Vienna, Veterinärplatz 1, 1210 Vienna, Austria; (K.H.); (K.N.); (E.R.F.)
| | - André Oszwald
- Clinical Institute for Pathology, Medical University Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria; (C.K.); (H.S.); (N.H.); (S.K.); (A.O.)
| | - Ebrahim Razzazi Fazeli
- Vetcore Facility for Research, University of Veterinary Medicine Vienna, Veterinärplatz 1, 1210 Vienna, Austria; (K.H.); (K.N.); (E.R.F.)
| | - Klaus Kratochwill
- Christian Doppler Laboratory for Molecular Stress Research in Peritoneal Dialysis, Department of Pediatrics and Adolescent Medicine, Medical University of Vienna, 1210 Vienna, Austria;
- Division of Pediatric Nephrology and Gastroenterology, Department of Pediatrics and Adolescent Medicine, Medical University of Vienna, 1210 Vienna, Austria;
| | - Christoph Aufricht
- Division of Pediatric Nephrology and Gastroenterology, Department of Pediatrics and Adolescent Medicine, Medical University of Vienna, 1210 Vienna, Austria;
| | - Gabor Szénási
- Institute of Translational Medicine, Semmelweis University Budapest, Tűzoltó u 37-47, 1094 Budapest, Hungary; (E.N.B.); (G.S.); (P.H.)
| | - Peter Hamar
- Institute of Translational Medicine, Semmelweis University Budapest, Tűzoltó u 37-47, 1094 Budapest, Hungary; (E.N.B.); (G.S.); (P.H.)
| | - Christoph A. Gebeshuber
- Clinical Institute for Pathology, Medical University Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria; (C.K.); (H.S.); (N.H.); (S.K.); (A.O.)
- Correspondence: ; Tel.: +43-1-40400-51840
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5
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Csenkey A, Jozsa G, Gede N, Pakai E, Tinusz B, Rumbus Z, Lukacs A, Gyongyi Z, Hamar P, Sepp R, Romanovsky AA, Hegyi P, Vajda P, Garami A. Systemic antibiotic prophylaxis does not affect infectious complications in pediatric burn injury: A meta-analysis. PLoS One 2019; 14:e0223063. [PMID: 31553768 PMCID: PMC6760783 DOI: 10.1371/journal.pone.0223063] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Accepted: 09/12/2019] [Indexed: 12/30/2022] Open
Abstract
In pediatric burns the use of systemic antibiotic prophylaxis is a standard procedure in some burn centers, though its beneficial effect on the infectious complications is debated. The present meta-analysis aimed at determining whether systemic antibiotic prophylaxis prevents infectious complications in pediatric patients with burn injuries. We searched the PubMed, EMBASE, and Cochrane Library databases from inception to August 2019. We included 6 studies, in which event rates of infectious complications were reported in children with burn injuries receiving or not receiving systemic antibiotic prophylaxis. We found that the overall odds ratio (OR) of developing an infection (including local and systemic) was not different between the groups (OR = 1.35; 95% CI, 0.44, 4.18). The chances for systemic infectious complications alone were also not different between antibiotic-treated and non-treated patients (OR = 0.74; 95% CI, 0.38, 1.45). Based on the age, affected total body surface area, and country income level, we did not find any subgroup that benefited from the prophylaxis. Our findings provide quantitative evidence for the inefficacy of systemic antibiotic prophylaxis in preventing infections in pediatric burns. To validate our conclusion, multinational, randomized trials in a diverse population of children with burn injuries are warranted.
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Affiliation(s)
- Alexandra Csenkey
- Department of Thermophysiology, Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
- Department of Paediatrics, Surgical Division, University of Pecs, Pecs, Hungary
| | - Gergo Jozsa
- Department of Thermophysiology, Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
- Department of Paediatrics, Surgical Division, University of Pecs, Pecs, Hungary
| | - Noemi Gede
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Eszter Pakai
- Department of Thermophysiology, Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Benedek Tinusz
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Zoltan Rumbus
- Department of Thermophysiology, Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Anita Lukacs
- Department of Public Health, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - Zoltan Gyongyi
- Department of Public Health Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Peter Hamar
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Robert Sepp
- Second Department of Internal Medicine and Cardiology Centre, University Szeged, Szeged, Hungary
| | - Andrej A. Romanovsky
- Thermoregulation and Systemic Inflammation Laboratory (FeverLab), Trauma Research, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, United States of America
| | - Peter Hegyi
- Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
| | - Peter Vajda
- Department of Paediatrics, Surgical Division, University of Pecs, Pecs, Hungary
| | - Andras Garami
- Department of Thermophysiology, Institute for Translational Medicine, Medical School, University of Pecs, Pecs, Hungary
- * E-mail:
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6
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Bukosza EN, Kaucsár T, Godó M, Lajtár E, Tod P, Koncsos G, Varga Z, Nguyen M, Schachner H, Sőti C, Giricz Z, Szénási G, Hamar P. FP059THE KIDNEY IS RELATIVELY RESISTANT TO OBESITY-RELATED COMORBIDITY IN PREDIABETIC LONG EVANS RATS FED A HIGH FAT DIET. Nephrol Dial Transplant 2019. [DOI: 10.1093/ndt/gfz106.fp059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
| | | | - Mária Godó
- Semmelweis University, Budapest, Hungary
| | | | - Pál Tod
- Semmelweis University, Budapest, Hungary
| | | | | | | | | | - Csaba Sőti
- Semmelweis University, Budapest, Hungary
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7
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Kaucsár T, Tod P, Róka B, Godó M, Sárközy H, Kiss N, Szénási G, Hamar P. FP288THE lNCRNA PROFILE IN CONTROL AND ISCHEMICALLY INJURED KIDNEYS OF OLD MICE. Nephrol Dial Transplant 2019. [DOI: 10.1093/ndt/gfz106.fp288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
| | - Pál Tod
- Semmelweis University, Budapest, Hungary
| | | | - Mária Godó
- Semmelweis University, Budapest, Hungary
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8
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Tod P, Vidmar R, Vizovišek M, Róka B, Szénási G, Fonović M, Turk B, Hamar P. FP286THE ROLE OF CYSTEINE CATHEPSINS IN LPS-INDUCED PRECONDITIONING IN THE MOUSE KIDNEY. Nephrol Dial Transplant 2019. [DOI: 10.1093/ndt/gfz106.fp286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Pál Tod
- Semmelweis University, Budapest, Hungary
| | - Robert Vidmar
- Biochemistry and Molecular and Structural Biology, Ljubljana, Slovenia
| | - Matej Vizovišek
- Biochemistry and Molecular and Structural Biology, Ljubljana, Slovenia
| | - Beáta Róka
- Semmelweis University, Budapest, Hungary
| | | | - Marco Fonović
- Biochemistry and Molecular and Structural Biology, Ljubljana, Slovenia
| | - Boris Turk
- Biochemistry and Molecular and Structural Biology, Ljubljana, Slovenia
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Róka B, Tod P, Kaucsár T, Fonović M, Turk B, Vizovišek M, Vidmar R, Szénási G, Hamar P. FP294TEMPORAL PROFILE OF THE RENAL ACUTE PHASE RESPONSE IN SEPSIS-INDUCED ACUTE KIDNEY INJURY IN MICE. Nephrol Dial Transplant 2019. [DOI: 10.1093/ndt/gfz106.fp294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
| | - Pál Tod
- Semmelweis University, Budapest, Hungary
| | | | - Marco Fonović
- Department of Biochemistry and Molecular and Structural Biology, Ljubljana, Slovenia, Slovenia
| | - Boris Turk
- Biochemistry and Molecular and Structural Biology, Ljubljana, Slovenia
| | - Matej Vizovišek
- Biochemistry and Molecular and Structural Biology, Ljubljana, Slovenia
| | - Robert Vidmar
- Biochemistry and Molecular and Structural Biology, Ljubljana, Slovenia
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Kaucsár T, Tod P, Godó M, Lorenzen J, Thum T, Szénási G, Hamar P. FP280FUNCTIONAL INVESTIGATION OF MIR-17-5P INHIBITION IN KIDNEY ISCHEMIA-REPERFUSION INJURY IN MICE. Nephrol Dial Transplant 2019. [DOI: 10.1093/ndt/gfz106.fp280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
| | - Pál Tod
- Semmelweis University, Budapest, Hungary
| | - Mária Godó
- Semmelweis University, Budapest, Hungary
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11
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Hosszu A, Antal Z, Lenart L, Hodrea J, Koszegi S, Balogh DB, Banki NF, Wagner L, Denes A, Hamar P, Degrell P, Vannay A, Szabo AJ, Fekete A. σ1-Receptor Agonism Protects against Renal Ischemia-Reperfusion Injury. J Am Soc Nephrol 2017; 28:152-165. [PMID: 27056295 PMCID: PMC5198266 DOI: 10.1681/asn.2015070772] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2015] [Accepted: 03/05/2016] [Indexed: 11/03/2022] Open
Abstract
Mechanisms of renal ischemia-reperfusion injury remain unresolved, and effective therapies are lacking. We previously showed that dehydroepiandrosterone protects against renal ischemia-reperfusion injury in male rats. Here, we investigated the potential role of σ1-receptor activation in mediating this protection. In rats, pretreatment with either dehydroepiandrosterone or fluvoxamine, a high-affinity σ1-receptor agonist, improved survival, renal function and structure, and the inflammatory response after sublethal renal ischemia-reperfusion injury. In human proximal tubular epithelial cells, stimulation by fluvoxamine or oxidative stress caused the σ1-receptor to translocate from the endoplasmic reticulum to the cytosol and nucleus. Fluvoxamine stimulation in these cells also activated nitric oxide production that was blocked by σ1-receptor knockdown or Akt inhibition. Similarly, in the postischemic rat kidney, σ1-receptor activation by fluvoxamine triggered the Akt-nitric oxide synthase signaling pathway, resulting in time- and isoform-specific endothelial and neuronal nitric oxide synthase activation and nitric oxide production. Concurrently, intravital two-photon imaging revealed prompt peritubular vasodilation after fluvoxamine treatment, which was blocked by the σ1-receptor antagonist or various nitric oxide synthase blockers. In conclusion, in this rat model of ischemia-reperfusion injury, σ1-receptor agonists improved postischemic survival and renal function via activation of Akt-mediated nitric oxide signaling in the kidney. Thus, σ1-receptor activation might provide a therapeutic option for renoprotective therapy.
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Affiliation(s)
- Adam Hosszu
- MTA-SE Lendulet Diabetes Research Group and
- First Department of Pediatrics
| | | | | | | | | | | | | | | | - Adam Denes
- Laboratory of Neuroimmunology, Institute of Experimental Medicine, Budapest, Hungary; and
| | - Peter Hamar
- Institute of Pathophysiology, Semmelweis University, Budapest, Hungary
| | - Peter Degrell
- Department of Pathology, Moritz Kaposi General Hospital, Kaposvar, Hungary
| | - Adam Vannay
- MTA-SE Pediatrics and Nephrology Research Group, Hungarian Academy of Sciences and Semmelweis University, Budapest, Hungary
| | - Attila J Szabo
- First Department of Pediatrics
- MTA-SE Pediatrics and Nephrology Research Group, Hungarian Academy of Sciences and Semmelweis University, Budapest, Hungary
| | - Andrea Fekete
- MTA-SE Lendulet Diabetes Research Group and
- First Department of Pediatrics
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12
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Bagi Z, Hamar P, Kardos M, Koller A. Lack of flow mediated dilation and enhanced angiotensin II-induced constriction in skeletal muscle arterioles of lupus-prone autoimmune mice. Lupus 2016; 15:326-34. [PMID: 16830878 DOI: 10.1191/0961203306lu2297oa] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Systemic lupus erythematosus (SLE) is associated with disturbances in the microcirculation of various tissues, yet the nature of arteriolar dysfunction has not been characterized. Thus, changes in diameter of isolated, pressurized skeletal muscle arterioles of mice with systemic autoimmune disease (lupus prone, MRL/lpr four-month old female) and control (MRL) mice were investigated by video-microscopy. Arteriolar responses to changes in intraluminal pressure, flow, and to vasoactive agents with known mechanisms of action were compared. The active and passive (in Ca2+ free solution) diameter of MRL/lpr arterioles were not significantly different compared to MRL and morphometric changes were not apparent. Compared to MRL mice the endothelium-dependent dilations to increase in flow, acetylcholine and bradykinin were markedly reduced in arterioles of MRL/lpr mice. Endothelium-independent dilations to sodium-nitroprusside and adenosine were similar in MRL and MRL/lpr arterioles. Furthermore, angiotensin II elicited greater constrictions in MRL/lpr arterioles, whereas serotonin-induced constrictions were similar in both groups. Thus, in arterioles of MRL/lpr mice endothelium-dependent dilator mechanisms are impaired and constriction to angiotensin II is enhanced, suggesting specific alterations in the vasomotor function of microvessels that are likely contribute to the disturbance of skeletal muscle blood flow observed in systemic lupus erythematosus.
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Affiliation(s)
- Z Bagi
- Division of Clinical Physiology, Institute of Cardiology, University of Debrecen, Debrecen, Hungary
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13
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Gilboa-Geffen A, Hamar P, Le MTN, Wheeler LA, Trifonova R, Petrocca F, Wittrup A, Lieberman J. Gene Knockdown by EpCAM Aptamer-siRNA Chimeras Suppresses Epithelial Breast Cancers and Their Tumor-Initiating Cells. Mol Cancer Ther 2015; 14:2279-91. [PMID: 26264278 DOI: 10.1158/1535-7163.mct-15-0201-t] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Accepted: 08/03/2015] [Indexed: 11/16/2022]
Abstract
Effective therapeutic strategies for in vivo siRNA delivery to knockdown genes in cells outside the liver are needed to harness RNA interference for treating cancer. EpCAM is a tumor-associated antigen highly expressed on common epithelial cancers and their tumor-initiating cells (TIC, also known as cancer stem cells). Here, we show that aptamer-siRNA chimeras (AsiC, an EpCAM aptamer linked to an siRNA sense strand and annealed to the siRNA antisense strand) are selectively taken up and knock down gene expression in EpCAM(+) cancer cells in vitro and in human cancer biopsy tissues. PLK1 EpCAM-AsiCs inhibit colony and mammosphere formation (in vitro TIC assays) and tumor initiation by EpCAM(+) luminal and basal-A triple-negative breast cancer (TNBC) cell lines, but not EpCAM(-) mesenchymal basal-B TNBCs, in nude mice. Subcutaneously administered EpCAM-AsiCs concentrate in EpCAM(+) Her2(+) and TNBC tumors and suppress their growth. Thus, EpCAM-AsiCs provide an attractive approach for treating epithelial cancer.
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MESH Headings
- Animals
- Antigens, Neoplasm/genetics
- Antigens, Neoplasm/metabolism
- Aptamers, Nucleotide/administration & dosage
- Aptamers, Nucleotide/genetics
- Aptamers, Nucleotide/metabolism
- Base Sequence
- Breast Neoplasms/metabolism
- Breast Neoplasms/pathology
- Carcinogenesis/metabolism
- Cell Adhesion Molecules/genetics
- Cell Adhesion Molecules/metabolism
- Cell Cycle Proteins/genetics
- Cell Cycle Proteins/metabolism
- Cell Line, Tumor
- Epithelial Cell Adhesion Molecule
- Female
- Gene Expression
- Gene Knockdown Techniques
- Humans
- Mice, Nude
- Neoplasm Transplantation
- Neoplasms, Glandular and Epithelial/metabolism
- Neoplasms, Glandular and Epithelial/pathology
- Neoplastic Stem Cells/physiology
- Protein Serine-Threonine Kinases/genetics
- Protein Serine-Threonine Kinases/metabolism
- Proto-Oncogene Proteins/genetics
- Proto-Oncogene Proteins/metabolism
- RNA Interference
- RNA, Small Interfering/administration & dosage
- RNA, Small Interfering/genetics
- RNA, Small Interfering/metabolism
- Tumor Burden
- Polo-Like Kinase 1
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Affiliation(s)
- Adi Gilboa-Geffen
- Cellular and Molecular Medicine Program, Boston Children's Hospital and Department of Pediatrics, Harvard Medical School, Boston, Massachusetts
| | - Peter Hamar
- Cellular and Molecular Medicine Program, Boston Children's Hospital and Department of Pediatrics, Harvard Medical School, Boston, Massachusetts. Institute of Pathophysiology, Semmelweis University, Budapest, Hungary
| | - Minh T N Le
- Cellular and Molecular Medicine Program, Boston Children's Hospital and Department of Pediatrics, Harvard Medical School, Boston, Massachusetts
| | - Lee Adam Wheeler
- Cellular and Molecular Medicine Program, Boston Children's Hospital and Department of Pediatrics, Harvard Medical School, Boston, Massachusetts
| | - Radiana Trifonova
- Cellular and Molecular Medicine Program, Boston Children's Hospital and Department of Pediatrics, Harvard Medical School, Boston, Massachusetts
| | - Fabio Petrocca
- Cellular and Molecular Medicine Program, Boston Children's Hospital and Department of Pediatrics, Harvard Medical School, Boston, Massachusetts
| | - Anders Wittrup
- Cellular and Molecular Medicine Program, Boston Children's Hospital and Department of Pediatrics, Harvard Medical School, Boston, Massachusetts
| | - Judy Lieberman
- Cellular and Molecular Medicine Program, Boston Children's Hospital and Department of Pediatrics, Harvard Medical School, Boston, Massachusetts.
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Gilboa-Geffen A, Hamar P, Wheeler LA, Trifonova R, Petrocca F, Wittrup A, Lieberman J. Abstract LB-299: Gene knockdown by EpCAM aptamer-siRNA chimeras suppresses epithelial breast cancers and their tumor-initiating cells. Cancer Res 2015. [DOI: 10.1158/1538-7445.am2015-lb-299] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Effective therapeutic strategies for in vivo siRNA delivery to knockdown genes in cells outside the liver are needed to harness RNA interference for treating cancer. EpCAM is a tumor-associated antigen highly expressed on common epithelial cancers and their tumor-initiating cells (T-IC, also known as cancer stem cells). Here we show that aptamer-siRNA chimeras (AsiC, an EpCAM aptamer linked to an siRNA sense strand and annealed to the siRNA antisense strand) are selectively taken up and knockdown gene expression in EpCAM+ cancer cells in vitro and in human cancer biopsy tissues. PLK1 EpCAM-AsiCs inhibit colony and mammosphere formation (in vitro T-IC assays) and tumor initiation by EpCAM+ luminal and basal-A triple negative breast cancer (TNBC) cell lines, but not EpCAM- mesenchymal basal-B TNBCs, in nude mice. Subcutaneously administered EpCAM-AsiCs concentrate in EpCAM+ Her2+ and TNBC tumors and suppress their growth. Thus EpCAM-AsiCs provide an attractive approach for treating epithelial cancer.
Note: This abstract was not presented at the meeting.
Citation Format: Adi Gilboa-Geffen, Peter Hamar, Lee Adam Wheeler, Radiana Trifonova, Fabio Petrocca, Anders Wittrup, Judy Lieberman. Gene knockdown by EpCAM aptamer-siRNA chimeras suppresses epithelial breast cancers and their tumor-initiating cells. [abstract]. In: Proceedings of the 106th Annual Meeting of the American Association for Cancer Research; 2015 Apr 18-22; Philadelphia, PA. Philadelphia (PA): AACR; Cancer Res 2015;75(15 Suppl):Abstract nr LB-299. doi:10.1158/1538-7445.AM2015-LB-299
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Wittrup A, Ai A, Liu X, Hamar P, Trifonova R, Charisse K, Manoharan M, Kirchhausen T, Lieberman J. Visualizing lipid-formulated siRNA release from endosomes and target gene knockdown. Nat Biotechnol 2015; 33:870-6. [PMID: 26192320 DOI: 10.1038/nbt.3298] [Citation(s) in RCA: 376] [Impact Index Per Article: 41.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Accepted: 06/22/2015] [Indexed: 01/04/2023]
Abstract
A central hurdle in developing small interfering RNAs (siRNAs) as therapeutics is the inefficiency of their delivery across the plasma and endosomal membranes to the cytosol, where they interact with the RNA interference machinery. With the aim of improving endosomal release, a poorly understood and inefficient process, we studied the uptake and cytosolic release of siRNAs, formulated in lipoplexes or lipid nanoparticles, by live-cell imaging and correlated it with knockdown of a target GFP reporter. siRNA release occurred invariably from maturing endosomes within ~5-15 min of endocytosis. Cytosolic galectins immediately recognized the damaged endosome and targeted it for autophagy. However, inhibiting autophagy did not enhance cytosolic siRNA release. Gene knockdown occurred within a few hours of release and required <2,000 copies of cytosolic siRNAs. The ability to detect cytosolic release of siRNAs and understand how it is regulated will facilitate the development of rational strategies for improving the cytosolic delivery of candidate drugs.
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Affiliation(s)
- Anders Wittrup
- 1] Program in Cellular and Molecular Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA. [2] Department of Clinical Sciences, Section for Oncology and Pathology, Lund University, Lund, Sweden
| | - Angela Ai
- Program in Cellular and Molecular Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Xing Liu
- Program in Cellular and Molecular Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Peter Hamar
- 1] Program in Cellular and Molecular Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA. [2] Institute of Pathophysiology, Semmelweis University, Budapest, Hungary
| | - Radiana Trifonova
- Program in Cellular and Molecular Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | | | | | - Tomas Kirchhausen
- 1] Program in Cellular and Molecular Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA. [2] Department of Cell Biology, Harvard Medical School, Boston, Massachusetts, USA. [3] Department of Pediatrics, Harvard Medical School, Boston, Massachusetts, USA
| | - Judy Lieberman
- 1] Program in Cellular and Molecular Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA. [2] Department of Pediatrics, Harvard Medical School, Boston, Massachusetts, USA
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Zalai D, Panics G, Bobak P, Csáki I, Hamar P. Quality of functional movement patterns and injury examination in elite-level male professional football players. ACTA ACUST UNITED AC 2015; 102:34-42. [PMID: 25481368 DOI: 10.1556/aphysiol.101.2014.010] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The purpose of this study is to examine the quality of functional movement patterns among one of Hungary's first league soccer clubs, where the elite male football players (N = 20) utilize the well-established Functional Movement Screen™ (FMS) system; a comprehensive functional program designed to determine and identify the quality of movement and the greatest risk factors for non-contact injuries. Furthermore, an additional purpose of this program is to examine injuries over the course of 6 competitive months. Focusing on the mechanisms of injuries and their causes in the lower extremities during this period is one of the key objectives. Over the course of 6 months we found significant differences between ankle injuries and the FMS Hurdle Step exercise (p < 0.05), and the FMS Deep Squat exercise and knee and hip injuries (p < 0.05). The FMS pre-screening system found lower limb asymmetry present in 40% of the participants. The authors believe that the importance of preventative measures and structural sport specific pre-screening cannot be overemphasized, and that there is a growing need for further transparent research in this field in order to be more effective with regard to programs dedicated to injury prevention and the enhancement players' physical performance.
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Affiliation(s)
- David Zalai
- Semmelweis University School of PhD Studies, Faculty of Physical Education and Sport Science Alkotás u. 44 H-1123 Budapest Hungary
| | - G Panics
- Uzsoki Hospital Department of Orthopaedics and Traumatology Budapest Hungary
| | - P Bobak
- University of Leeds Department of Orthopaedics, Consultant Orthopaedic Surgeon Leeds UK
| | - I Csáki
- Semmelweis University Department of Physical Education Theory and Pedagogy, Faculty of Physical Education and Sport Science Budapest Hungary
| | - P Hamar
- Semmelweis University Department of Gymnastics, Rhythmic Gymnastics, Dance and Aerobics, Faculty of Physical Education and Sport Science Budapest Hungary
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Révész C, Kökény G, Wasik A, Kerjaschki D, Lehtonen S, Hamar P. SaO014REDUCTION OF EZRIN, A MAJOR CYTOSKELETAL PROTEIN DUE TO COLD INJURY ADVERSELY AFFECTS INITIAL RENAL GRAFT FUNCTION IN RATS. Nephrol Dial Transplant 2015. [DOI: 10.1093/ndt/gfv148.01] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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18
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Szalay C, Erdelyi K, Kökény G, Pacher P, Hamar P. SP320OXIDATIVE/NITRATIVE STRESS AND INFLAMMATION DRIVE PROGRESSION OF DOXORUBICIN-INDUCED RENAL FIBROSIS IN RATS AS REVEALED BY COMPARING A NORMAL AND A FIBROSIS-RESISTANT RAT STRAIN. Nephrol Dial Transplant 2015. [DOI: 10.1093/ndt/gfv191.40] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Kaucsár T, Godó M, Hamar P. FP211URINARY/PLASMA NEUTROPHIL GELATINASE ASSOCIATED LIPOCALIN IS A SPECIFIC AND SENSITIVE MARKER OF SUBCLINICAL ACUTE KIDNEY INJURY IN MICE. Nephrol Dial Transplant 2015. [DOI: 10.1093/ndt/gfv172.39] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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20
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Le MTN, Hamar P, Guo C, Basar E, Perdigão-Henriques R, Balaj L, Lieberman J. miR-200-containing extracellular vesicles promote breast cancer cell metastasis. J Clin Invest 2014; 124:5109-28. [PMID: 25401471 DOI: 10.1172/jci75695] [Citation(s) in RCA: 333] [Impact Index Per Article: 33.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Accepted: 10/03/2014] [Indexed: 12/21/2022] Open
Abstract
Metastasis is associated with poor prognosis in breast cancer patients. Not all cancer cells within a tumor are capable of metastasizing. The microRNA-200 (miR-200) family, which regulates the mesenchymal-to-epithelial transition, is enriched in the serum of patients with metastatic cancers. Ectopic expression of miR-200 can confer metastatic ability to poorly metastatic tumor cells in some settings. Here, we investigated whether metastatic capability could be transferred between metastatic and nonmetastatic cancer cells via extracellular vesicles. miR-200 was secreted in extracellular vesicles from metastatic murine and human breast cancer cell lines, and miR-200 levels were increased in sera of mice bearing metastatic tumors. In culture, murine and human metastatic breast cancer cell extracellular vesicles transferred miR-200 microRNAs to nonmetastatic cells, altering gene expression and promoting mesenchymal-to-epithelial transition. In murine cancer and human xenograft models, miR-200-expressing tumors and extracellular vesicles from these tumors promoted metastasis of otherwise weakly metastatic cells either nearby or at distant sites and conferred to these cells the ability to colonize distant tissues in a miR-200-dependent manner. Together, our results demonstrate that metastatic capability can be transferred by the uptake of extracellular vesicles.
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Wasik AA, Koskelainen S, Hyvönen ME, Musante L, Lehtonen E, Koskenniemi K, Tienari J, Vaheri A, Kerjaschki D, Szalay C, Révész C, Varmanen P, Nyman TA, Hamar P, Holthöfer H, Lehtonen S. Ezrin Is Down-Regulated in Diabetic Kidney Glomeruli and Regulates Actin Reorganization and Glucose Uptake via GLUT1 in Cultured Podocytes. The American Journal of Pathology 2014; 184:1727-39. [DOI: 10.1016/j.ajpath.2014.03.002] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Revised: 02/28/2014] [Accepted: 03/05/2014] [Indexed: 01/27/2023]
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Masszi G, Benko R, Csibi N, Horvath EM, Tokes AM, Novak A, Beres NJ, Tarszabo R, Buday A, Repas C, Bekesi G, Patocs A, Nadasy GL, Hamar P, Benyo Z, Varbiro S. Corrigendum to “Endothelial relaxation mechanisms and nitrative stress are partly restored by vitamin D3 therapy in a rat model of polycystic ovary syndrome” [Life Sci. 93 (2013) 133–138]. Life Sci 2014. [DOI: 10.1016/j.lfs.2014.03.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Masszi G, Novak A, Tarszabo R, Horvath EM, Buday A, Ruisanchez E, Tokes AM, Sara L, Benko R, Nadasy GL, Revesz C, Hamar P, Benyó Z, Varbiro S. Effects of vitamin D3 derivative--calcitriol on pharmacological reactivity of aortic rings in a rodent PCOS model. Pharmacol Rep 2014; 65:476-83. [PMID: 23744432 DOI: 10.1016/s1734-1140(13)71023-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2012] [Revised: 11/16/2012] [Indexed: 11/30/2022]
Abstract
BACKGROUND The aim of this study was to examine the effects of the hyperandrogenic state in dihydrotestosterone (DHT)-induced polycystic ovary syndrome (PCOS), the vascular responses to different vasoactive agents, and the modulatory role of vitamin D3. METHODS APCOS model was induced by DHT application in 20 female Wistar rats. Ten of the DHT treated rats simultaneously received calcitriol treatment. After 10 weeks, myographs were used to test the reactivity of isolated thoracic aortic rings to norepinephrine and acetylcholine. Thereafter, the vascular rings were incubated with the NO-synthase blocker (nitro-L-arginine methyl ester) or the cyclooxygenase inhibitor (indomethacin) for 20 min, and the effects of norepinephrine and acetylcholine were re-evaluated. RESULTS Norepinephrine-induced vasoconstriction was enhanced after DHT treatment, but this effect was attenuated by calcitriol administration. Vasorelaxation of DHT-treated thoracic aortic rings was impaired, but this could be partly reversed by calcitriol application. Impaired NO-dependent vasorelaxation in DHT-treated animals was mostly reversed by concomitant calcitriol administration, but this effect was diminished by prostanoid-dependent vasoconstriction. CONCLUSIONS These studies show that the enhanced sensitivity to vasoconstrictors and impaired NO-dependent vasorelaxation in hyperandrogenic PCOS rats could be partially reversed by calcitriol treatment.
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Affiliation(s)
- Gabriella Masszi
- Department of Cardiology, Bajcsy Zs Hospital, Maglodi St 89-91, H-1106 Budapest, Hungary
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Tóth Á, Kocsis B, Damjanova I, Kristóf K, Jánvári L, Pászti J, Csercsik R, Topf J, Szabó D, Hamar P, Nagy K, Füzi M. Fitness cost associated with resistance to fluoroquinolones is diverse across clones of Klebsiella pneumoniae and may select for CTX-M-15 type extended-spectrum β-lactamase. Eur J Clin Microbiol Infect Dis 2013; 33:837-43. [DOI: 10.1007/s10096-013-2022-6] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Accepted: 11/15/2013] [Indexed: 11/24/2022]
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Máthé C, Szénási G, Sebestény A, Blázovics A, Szentmihályi K, Hamar P, Albert M. Protective effect of CV247 against cisplatin nephrotoxicity in rats. Hum Exp Toxicol 2013; 33:789-99. [DOI: 10.1177/0960327113480972] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
CV247 (CV), an aqueous mixture of copper (Cu) and manganese (Mn) gluconates, vitamin C and sodium salicylate increased the antitumour effects of cisplatin (CDPP; cis-diamminedichloroplatinum) in vitro. We hypothesized that the antioxidant and cyclooxygenase-2 (COX-2; prostaglandin-endoperoxide synthase 2) inhibitory components of CV can protect the kidneys from CDPP nephrotoxicity in rats. CDPP (6.5 mg/kg, intraperitoneally) slightly elevated serum creatinine (Crea) and blood urea nitrogen (BUN) 12 days after treatment. Kidney histology demonstrated extensive tubular epithelial damage and COX-2 immunoreactivity increased 14 days after treatment. A large amount of platinum (Pt) accumulated in the kidney of CDPP-treated rats. Furthermore, CDPP decreased renal iron (Fe), molybdenum (Mo), zinc (Zn), Cu and Mn concentrations and increased plasma Fe and Cu concentrations. CDPP elevated plasma free radical concentration. Treatment with CV alone for 14 days (twice 3 ml/kg/day orally) did not influence these parameters. Chronic CV administration after CDPP reduced renal histological damage and slightly decreased COX-2 immunoreactivity, while failed to prevent the increase in Crea and BUN levels. Blood free radical concentration was reduced, that is, CV improved redox homeostasis. CV restored plasma Fe and renal Fe, Mo and Zn, while decreased Pt and elevated Cu and Mn concentrations in the kidney. Besides the known synergistic antitumour effects with CDPP, CV partially protected the kidneys from CDPP nephrotoxicity probably through its antioxidant effect.
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Affiliation(s)
- C. Máthé
- Department of Pulmonology, Semmelweis University, Budapest, Hungary
| | - G. Szénási
- Institute of Pathophysiology, Semmelweis University, Budapest, Hungary
| | - A. Sebestény
- Laboratory Animal Science Unit, Faculty of Veterinary Science, Szent István University, Budapest, Hungary
| | - A. Blázovics
- Department of Pharmacognosy, Semmelweis University, Budapest, Hungary
| | - K. Szentmihályi
- Institute of Materials and Environmental Chemistry Research Centre for Natural Sciences, Budapest, Hungary
| | - P. Hamar
- Institute of Pathophysiology, Semmelweis University, Budapest, Hungary
| | - M. Albert
- Vetmed Laboratory Ltd, Budapest, Hungary
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Cantaluppi V, Medica D, Figliolini F, Gatti S, Bruno S, Quercia AD, Dellepiane S, Biancone L, Tetta C, Camussi G, Zhou L, Dai X, Feng M, Huang X, Fu P, Lan HY, de Ramon L, Ripoll E, Luzardo L, Merino A, Bolanos N, Lloberas N, Cruzado JM, Grinyo JM, Torras J, Kaucsar T, Revesz C, Godo M, Racz Z, Tarszabo R, Hamar P, Banki NF, Hosszu A, Antal Z, Koszegi S, Wagner L, Gellai R, Lenart L, Vannay A, Muller V, Szabo AJ, Tulassay T, Fekete A. Tubular ischemia and toxicity. Nephrol Dial Transplant 2013. [DOI: 10.1093/ndt/gft178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Lai CF, Lin SL, Chiang WC, Chen YM, Kuo ML, Tsai TJ, Hwang HS, Choi YA, Park KC, Yang KJ, Choi HS, Kim SH, Lee SJ, Chang YK, Kim SY, Yang CW, Xiujuan Z, Yoshimura R, Matsuyama M, Chargui J, Touraine JL, Yoshimura N, Zulkarnaev AB, Vasilenko IA, Artemov DV, Vatazin AV, Park SK, Kang KP, Lee S, Kim W, Schneider R, Betz B, Moller-Ehrlich K, Wanner C, Sauvant C, Yang KJ, Park KC, Choi HS, Kim SH, Choi YA, Chang YK, Park CW, Kim SY, Lee SJ, Yang CW, Hwang HS, Sohotnik R, Nativ O, Abbasi A, Awad H, Frajewicki V, Armaly Z, Heyman SN, Nativ O, Abassi Z, Chen PY, Chen BL, Yang CC, Chiang CK, Liu SH, Abozahra AE, Abd-Elkhabir AA, Shokeir A, Hussein A, Awadalla A, Barakat N, Abdelaziz A, Yamaguchi J, Tanaka T, Eto N, Nangaku M, Quiros Y, Lopez-Hernandez FJ, Perez de Obanos MP, Ruiz J, Lopez-Novoa JM, Shin HS, Kim MJ, Choi YJ, Ryu ES, Choi HS, Kang DH, Jankauskas SS, Pevzner IB, Zorova LD, Babenko VA, Morosanova MA, Plotnikov EY, Zorov DB, Huang CY, Huang TM, Wu VC, Young GH, Plotnikov EY, Pevzner IB, Zorova LD, Chupyrkina AA, Zorov SD, Zorov DB, Grande JP, Hartono SP, Knudsen BE, Mederle K, Castrop H, Hocherl K, Iwakura T, Fujikura T, Ohashi N, Yasuda H, Fujigaki Y, Matsui I, Hamano T, Inoue K, Obi Y, Nakano C, Kusunoki Y, Tsubakihara Y, Rakugi H, Isaka Y, Shimomura A, Wallentin Guron C, Nguy L, Lundgren J, Grimberg E, Kashioulis P, Guron G, Guron G, DiBona GF, Nguy L, Grimberg E, Lundgren J, Nedergaard Mikkelsen M, Marcussen N, Saeed A, Edvardsson K, Lindberg K, Larsson T, Ito K, Nakashima H, Watanabe M, Abe Y, Ogahara S, Saito T, Albertoni G, Borges F, Schor N, Beresneva ON, Parastayeva MM, Kucher AG, Ivanova GT, Shved N, Rybakova MG, Kayukov IG, Smirnov AV, Chen JF, Ni HF, Pan MM, Liu H, Xu M, Zhang MH, Liu BC, Kim Y, Choi BS, Kim YS, Han JS, Reis LA, Christo JS, Simoes MDJ, Schor N, Mulay SR, Santhosh Kumar VR, Kulkarni OP, Darisipudi M, Lech M, Anders HJ, Zorov DB, Plotnikov EY, Silachev DN, Jankauskas SS, Pevzner IB, Zorova LD, Zorov SD, Morosanova MA, Sola A, Jung M, Ventayol M, Mastora C, Buenestado S, Hotter G, Rong S, Shushakova N, Wensvoort G, Haller H, Gueler F, Pan MM, Zhang MH, Ni HF, Chen JF, Xu M, Liu BC, Morais C, Vesey DA, Johnson DW, Gobe GC, Godo M, Kaucsar T, Revesz C, Hamar P, Cheng Q, Wen J, Ma Q, Zhao J, Castellano G, Stasi A, Di Palma AM, Gigante M, Netti GS, Curci C, Intini A, Divella C, Prattichizzo C, Fiaccadori E, Pertosa G, Grandaliano G, Gesualdo L, Wei QW, Jing QQ, Ying NJ, Dong QZ, Yong G, Choi YJ, Kim MJ, Shin HS, Ryu ES, Choi HS, Kang DH, Pevzner IB, Pulkova NV, Plotnikov EY, Zorova LD, Silachev DN, Morosanova MA, Sukhikh GT, Zorov DB, Kim S, Lee J, Nam NJ, Na KY, Han JS, Ma SK, Joo SY, Kim CS, Choi JS, Bae EH, Lee J, Kim SW, Cernaro V, Medici MA, Donato V, Trimboli D, Lorenzano G, Santoro D, Montalto G, Buemi M, Longo V, Segreto HRC, Almeida W, Schor N, Ramos MF, Gomes L, Razvickas C, Schor N, Gueler F, Rong S, Gutberlet M, Meier M, Mengel M, Wacker D, Haller H, Hueper K, Uzum A, Ersoy R, Cakalagaoglu F, Karaman M, Kolatan E, Sahin O, Yilmaz O, Cirit M, Inal S, Koc E, Okyay GU, Pasaoglu O, Gonul I, Oyar E, Pasaoglu H, Guz G, Sabbatini M, Rossano R, Andreucci M, Pisani A, Riccio E, Choi DE, Jeong JY, Kim SS, Chang YK, Na KR, Lee KW, Shin YT, Silva AF, Teixeira VC, Schor N, Meszaros K, Koleganova-Gut N, Schaefer F, Ritz E, Walacides D, Ruskamp N, Rong S, Hueper K, Meier M, Haller H, Schiffer M, Gueler F, Marom O, Haick H, Nakhoul F, Chen JF, Liu H, Ni HF, Lv LL, Zhang MH, Tang RN, Zhang JD, Ma KL, Chen PS, Liu BC, Wu VC, Young GH, Chen YM, Ko WJ, Misiara GP, Coimbra TM, Silva GEB, Costa RS, Francescato HDC, Neto MM, Dantas M, Lindberg K, Olauson H, Amin R, Ponnusamy A, Goetz R, Mohammadi M, Canfield A, Kublickiene K, Larsson T, Rodriguez J, Reyes EP, Cortes PP, Fernandez R, Yoon HE, Koh ES, Chung S, Shin SJ, Pazzano D, Montalto G, Cernaro V, Lupica R, Torre F, Costantino G, Buemi M, Prieto M, Gonzalez-Buitrago JM, Lopez-Hernandez F, Lopez-Novoa JM, Morales AI, Vicente-Vicente L, Ferreira L, Christo JS, Reis LA, Simoes MJ, Passos CD, Schor NS, Shimizu MHM, Canale D, de Braganca AC, Andrade L, Luchi WM, Seguro AC, Canale D, de Braganca AC, Goncalves J, Shimizu MHM, Volpini RA, Andrade L, Seguro AC, Garrido P, Fernandes J, Ribeiro S, Vala H, Parada B, Alves R, Belo L, Costa E, Santos-Silva A, Reis F. AKI - experimental models. Nephrol Dial Transplant 2013. [DOI: 10.1093/ndt/gft107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Masszi G, Horvath EM, Tarszabo R, Benko R, Novak A, Buday A, Tokes AM, Nadasy GL, Hamar P, Benyó Z, Varbiro S. Reduced estradiol-induced vasodilation and poly-(ADP-ribose) polymerase (PARP) activity in the aortas of rats with experimental polycystic ovary syndrome (PCOS). PLoS One 2013; 8:e55589. [PMID: 23555555 PMCID: PMC3608629 DOI: 10.1371/journal.pone.0055589] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2012] [Accepted: 12/27/2012] [Indexed: 01/03/2023] Open
Abstract
Polycystic ovary syndrome (PCOS) is a complex endocrine disorder characterized by hyperandrogenism and insulin resistance, both of which have been connected to atherosclerosis. Indeed, an increased risk of clinical manifestations of arterial vascular diseases has been described in PCOS. On the other hand endothelial dysfunction can be detected early on, before atherosclerosis develops. Thus we assumed that vascular dysfunction is also related directly to the hormonal imbalance rather than to its metabolic consequences. To detect early functional changes, we applied a novel rodent model of PCOS: rats were either sham operated or hyperandrogenism was achieved by implanting subcutaneous pellets of dihydrotestosterone (DHT). After ten weeks, myograph measurements were performed on isolated aortic rings. Previously we described an increased contractility to norepinephrine (NE). Here we found a reduced immediate relaxation to estradiol treatment in pre-contracted aortic rings from hyperandrogenic rats. Although the administration of vitamin D3 along with DHT reduced responsiveness to NE, it did not restore relaxation to estradiol. Poly-(ADP-ribose) polymerase (PARP) activity was assessed by poly-ADP-ribose immunostaining. Increased PAR staining in ovaries and circulating leukocytes from DHT rats showed enhanced DNA damage, which was reduced by concomitant vitamin D3 treatment. Surprisingly, PAR staining was reduced in both the endothelium and vascular smooth muscle cells of the aorta rings from hyperandrogenic rats. Thus in the early phase of PCOS, vascular tone is already shifted towards vasoconstriction, characterized by reduced vasorelaxation and vascular dysfunction is concomitant with altered PARP activity. Based on our findings, PARP inhibitors might have a future perspective in restoring metabolic disorders in PCOS.
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MESH Headings
- Animals
- Aorta/enzymology
- Aorta/pathology
- Aorta/physiopathology
- Cholecalciferol/pharmacology
- Endothelium, Vascular/enzymology
- Endothelium, Vascular/pathology
- Endothelium, Vascular/physiopathology
- Estradiol/pharmacology
- Estrogens/pharmacology
- Female
- Muscle, Smooth, Vascular/enzymology
- Muscle, Smooth, Vascular/pathology
- Muscle, Smooth, Vascular/physiopathology
- Poly Adenosine Diphosphate Ribose/metabolism
- Poly(ADP-ribose) Polymerases/metabolism
- Polycystic Ovary Syndrome/chemically induced
- Polycystic Ovary Syndrome/metabolism
- Polycystic Ovary Syndrome/pathology
- Polycystic Ovary Syndrome/physiopathology
- Rats
- Rats, Wistar
- Vasoconstriction/drug effects
- Vasodilation/drug effects
- Vitamins/pharmacology
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Affiliation(s)
- Gabriella Masszi
- Cardiology Unit, Bajcsy-Zsilinszky Hospital, Budapest, Hungary
- * E-mail: (GM); (SV)
| | - Eszter Maria Horvath
- Institute of Human Physiology and Clinical Experimental Research, Semmelweis University, Budapest, Hungary
| | - Robert Tarszabo
- Department of Pathophysiology, Semmelweis University, Budapest, Hungary
| | - Rita Benko
- Institute of Human Physiology and Clinical Experimental Research, Semmelweis University, Budapest, Hungary
| | - Agnes Novak
- Cardiology Unit, Bajcsy-Zsilinszky Hospital, Budapest, Hungary
| | - Anna Buday
- Department of Pathophysiology, Semmelweis University, Budapest, Hungary
| | - Anna-Maria Tokes
- Department of Pathology, Semmelweis University, Budapest, Hungary
| | - Gyorgy L. Nadasy
- 2 Department Obstetrical Gynecology Semmelweis University, Budapest, Hungary
| | - Peter Hamar
- Department of Pathophysiology, Semmelweis University, Budapest, Hungary
| | - Zoltán Benyó
- Institute of Human Physiology and Clinical Experimental Research, Semmelweis University, Budapest, Hungary
| | - Szabolcs Varbiro
- 2 Department Obstetrical Gynecology Semmelweis University, Budapest, Hungary
- * E-mail: (GM); (SV)
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Masszi G, Buday A, Novak A, Horvath EM, Tarszabo R, Sara L, Revesz C, Benko R, Nadasy GL, Benyó Z, Hamar P, Varbiro S. Altered insulin-induced relaxation of aortic rings in a dihydrotestosterone-induced rodent model of polycystic ovary syndrome. Fertil Steril 2012; 99:573-8. [PMID: 23058684 DOI: 10.1016/j.fertnstert.2012.09.024] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2012] [Revised: 09/09/2012] [Accepted: 09/18/2012] [Indexed: 01/22/2023]
Abstract
OBJECTIVE To clarify the effects of dihydrotestosterone (DHT)-induced polycystic ovary syndrome (PCOS) on the insulin-dependent vasodilatation of the thoracic aorta and the role of vitamin D in a rat model. DESIGN Controlled experimental animal study. SETTING Laboratory. ANIMAL(S) Thirty adolescent female Wistar rats. INTERVENTION(S) The PCOS model was induced by 10 weeks of DHT treatment (83 μg/d). One-half of the DHT-treated animals also received vitamin D (120 ng/kg/wk). MAIN OUTCOME MEASURE(S) The aortic rings of the control, DHT, and DHT plus vitamin D-treated animals were isolated. The insulin-dependent vasodilation of the isolated aortic rings was compared in Krebs-Ringer solution and under blockade of nitric oxide (NO) synthase or cyclooxygenase. RESULT(S) The insulin-dependent vasorelaxation decreased in both DHT-treated groups independently from the vitamin D treatment; NO-dependent and -independent relaxations were both impaired. In response to prostanoid, vasoconstriction was increased after DHT treatment. The NO-independent relaxation was partially improved by vitamin D treatment, which was neutralized by increased prostanoid-dependent vasoconstriction. CONCLUSION(S) Previously, we found that vitamin D treatment prevented systemic insulin resistance; however, in this study, we did not detect any influence on the vascular insulin resistance of the aorta that was induced by DHT treatment. Consequently, controlling insulin resistance with vitamin D alone did not resolve the aortic endothelial dysfunction caused by the hyperandrogenic state.
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Affiliation(s)
- Gabriella Masszi
- Department of Cardiology, Bajcsy Zs. Hospital, Budapest, Hungary
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Sara L, Antal P, Masszi G, Buday A, Horvath EM, Hamar P, Monos E, Nadasy GL, Varbiro S. Arteriolar insulin resistance in a rat model of polycystic ovary syndrome. Fertil Steril 2011; 97:462-8. [PMID: 22154764 DOI: 10.1016/j.fertnstert.2011.11.015] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2011] [Revised: 11/03/2011] [Accepted: 11/14/2011] [Indexed: 10/14/2022]
Abstract
OBJECTIVE To investigate the vascular dysfunction caused by insulin resistance in polycystic ovary syndrome (PCOS) and the effectiveness of vitamin D in an animal model. DESIGN Controlled experimental animal study. SETTING Animal laboratory at a university research institute. ANIMAL(S) Thirty female Wistar rats. INTERVENTION(S) Rats were divided into groups at age 21-28 weeks. Twenty of them were subjected to dihydrotestosterone (DHT) treatment (83 μg/d); ten of them also received parallel vitamin D treatment (120 ng/100 g/wk). Oral glucose tolerance tests with insulin level measurements were performed. Gracilis arterioles were tested for their contractility as well as their nitric oxide (NO)-dependent and insulin-induced dilation using pressure arteriography. MAIN OUTCOME MEASURE(S) Several physiologic parameters, glucose metabolism, and pressure arteriography. RESULT(S) DHT treatment increased the passive diameter of resistance arterioles, lowered norepinephrine-induced contraction (30.1 ± 4.7% vs. 8.7 ± 3.6%) and reduced acetylcholine-induced (122.0 ± 2.9% vs. 48.0 ± 1.4%) and insulin-induced (at 30 mU/mL: 21.7 ± 5.3 vs. 9.8 ± 5.6%) dilation. Vitamin D treatment restored insulin relaxation and norepinephrine-induced contractility; in contrast, it failed to alter NO-dependent relaxation. CONCLUSION(S) In DHT-treated rats, in addition to metabolically proven insulin resistance, decreased insulin-induced vasorelaxation was observed and was improved by vitamin D treatment without affecting NO-dependent relaxation. The reduction in insulin-induced dilation of arterioles is an important as yet undescribed pathway of vascular damage in PCOS and might explain the clinical effectiveness of vitamin D treatment.
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Affiliation(s)
- Levente Sara
- Second Department of Obstetrics and Gynecology, Semmelweis University Budapest, Budapest, Hungary.
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Abstract
MicroRNAs (miRNAs) are a recently discovered class of small, non-coding RNAs which do not code proteins. MiRNAs regulate gene expression by inhibiting protein translation from the messenger RNA. MiRNAs may function in networks, forming a complex relationship with diseases. Furthermore, specific miRNAs have significant correlation with diseases of divergent origin. After identification of disease-associated miRNAs, their tissue expression could be altered in a beneficial way by inhibiting or mimicking their effects. Thus, modifying the expression of miRNAs is a potential future gene-therapeutic tool to influence post-transcriptional regulation of multiple genes in a single therapy. In this review we introduce the biogenesis, mechanism of action and future aspects of miRNAs. Research on the post-transcriptional regulation of gene expression by miRNA may reshape our understanding of diseases and consequently may bring new diagnostic markers and therapeutic agents. Therapeutic use of miRNAs is already under clinical investigation in RNA interference trials.
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Affiliation(s)
- Zs Rácz
- Semmelweis University Institute of Pathophysiology, Faculty of Medicine, Budapest, Hungary
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Baintner K, Kocsis B, Kovács K, Péterfi Z, Kökény G, Hamar P. Interaction of concanavalin a with bacterial lipopolysaccharides in agarose gel. Acta Microbiol Immunol Hung 2011; 58:201-9. [PMID: 21983321 DOI: 10.1556/amicr.58.2011.3.3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Binding of fluorescein isothiocyanate-labeled concanavalin A to a series of molecular species of lipopolysaccharide (LPS), purified from pathogenic bacteria, was studied via agarose gel precipitation experiments and the results were compared with available structural data.The LPS species could be divided into ConA-reactive and non-reactive ones. Reactivity resided in the O-specific chain of LPS, and binding to the lipid A or core moieties of LPS could not be demonstrated by the present methods. The α-D-glucose or α-D-mannose residues of the repeating O-specific oligosaccharide units appeared to be recognized by ConA, except when blocked by steric hindrance. Specificity of the reaction was verified by inhibition with 2% D-glucose. Binding by bacterium-specific sugar-residues could not be demonstrated.For precipitation to occur, polyvalency was required both for LPS and ConA, and the resulting precipitation appeared to be promoted by hydrophobic interactions between the lipid A moieties of LPS molecules. The LPS species were differently retained by the agarose gel, which can be explained by differences in their micellar structure in aqueous solution. E. coli O83 LPS did not readily diffused in 1% agarose gel, but its precipitation with ConA could be demonstrated either at elevated temperature or mixing it previously with molten agarose (Mancini's arrangement).
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Affiliation(s)
- K. Baintner
- 1 Semmelweis University Institute of Pathophysiology, Faculty of Medicine Budapest Hungary
| | - B. Kocsis
- 2 University of Pécs Department of Medical Microbiology and Immunology, Faculty of Medicine Pécs Hungary
| | - Krisztina Kovács
- 2 University of Pécs Department of Medical Microbiology and Immunology, Faculty of Medicine Pécs Hungary
| | - Z. Péterfi
- 2 University of Pécs Department of Medical Microbiology and Immunology, Faculty of Medicine Pécs Hungary
| | - G. Kökény
- 1 Semmelweis University Institute of Pathophysiology, Faculty of Medicine Budapest Hungary
| | - P. Hamar
- 1 Semmelweis University Institute of Pathophysiology, Faculty of Medicine Budapest Hungary
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Stokman G, Qin Y, Rácz Z, Hamar P, Price LS. Application of siRNA in targeting protein expression in kidney disease. Adv Drug Deliv Rev 2010; 62:1378-89. [PMID: 20667456 DOI: 10.1016/j.addr.2010.07.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2010] [Revised: 07/09/2010] [Accepted: 07/15/2010] [Indexed: 10/19/2022]
Abstract
Although it is one of the major targeted organs by systemically administered siRNA, when compared to other tissues the kidney receives only moderate interest regarding therapeutic siRNA delivery. Here we review recent approaches to target renal protein expression under normal and pathological conditions. Experimental evidence to support the clinical relevance of siRNA administration in the treatment of renal disease is discussed. High-throughput screening using recently available genome-wide RNA interference libraries provides a new, powerful tool that can be applied to conventional and 3D in vitro culture models for lead finding or the identification of signal pathway involvement in renal disease.
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Racz Z, Nagy E, Rosivall L, Szebeni J, Hamar P. Sugar-free, glycine-stabilized intravenous immunoglobulin prevents skin but not renal disease in the MRL/lpr mouse model of systemic lupus. Lupus 2010; 19:599-612. [PMID: 20167630 DOI: 10.1177/0961203309355299] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Intravenous immunoglobulin (IVIG) has a therapeutic potential in many autoimmune diseases. Based on its immune modulating and complement inhibiting effects, IVIG has been tested in systemic lupus erythematosus (SLE), but due to osmotic tubular injury caused by immunoglobulin-stabilizing sugar components, lupus nephritis had been accelerated in some patients, thus IVIG use in SLE has been abandoned. The availability of non-sugar-stabilized IVIG raised the possible re-evaluation of IVIG for SLE. We investigated high-dose, long-term non-sugar-stabilized IVIG treatment on skin and renal SLE manifestations in the MRL/lpr mouse model. Animals were treated once a week with glycine-stabilized IVIG or saline (0.2 ml/ 10 g BW) from 6 weeks until they were humanely killed at 5 months of age. IVIG diminished macroscopic cutaneous lupus compared with saline treated mice. Histology and complement-3 immunostaining also demonstrated a significant reduction of skin disease after IVIG treatment. However, renal histology and function were similar in both groups. Compared with typical osmotic tubular damage induced by 5% sucrose and 10% maltose (used for IVIG stabilization), we did not observe any osmotic tubular injury in the glycine-stabilized IVIG treated mice. Our data demonstrate a beneficial effect of IVIG on skin lupus without renal side-effects. Deeper understanding of the organ-specific pathomechanism may aid an individualized SLE therapy.
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Affiliation(s)
- Z Racz
- Institute of Pathophysiology, Semmelweis Medical University, Nagyvarad ter 4., Budapest 1089, Hungary
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Hamar P, Wang M, Godo M, Kokeny G, Rosivall L, Ouyang N, Heemann U. Lupus nephritis reoccurs following transplantation in the lupus prone mouse. Lupus 2009; 19:175-81. [PMID: 19946036 DOI: 10.1177/0961203309350753] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The incidence and pathomechanism of recurrent lupus nephritis (RLN) after transplantation is not clearly understood. Burning out of the autoimmune process or local immunoregulatory mechanisms in the kidney may be responsible for the low incidence of recurrence. These mechanisms cannot be investigated in human subjects, due to post-transplant immunosuppression. To investigate the pathomechanisms of RLN, male and female kidneys were transplanted from FAS deficient lupus prone (LPR) or control (FAS intact) MRL mice into either LPR or MRL recipients. Urinary protein and blood urea were assessed. Double negative (DN) lymphocyte proliferation was determined by flow cytometry. Two months after transplantation inflammatory infiltration of the glomerular, vascular and interstitial compartments were determined. Renal function as demonstrated by blood urea levels was normal in MRL recipients, but elevated in LPR recipients, independent of the donor strain. Paralleling functional results, inflammatory infiltration was mild or absent in MRL recipients of MRL grafts, and mild to moderate in MRL recipients of LPR grafts, suggesting that kidney removal from the autoimmune (LPR) environment significantly reduced inflammation. Graft infiltration was most severe in LPR recipients: grafts were similarly inflamed independent of the donor. All LPR recipients had significantly less CD4+ Th cells versus MRL mice. Transplantation of LPR grafts into MRL recipients reduced CD4+ Th cell percentage, accompanied by a slight induction of lupus autoantibody production. Our results demonstrate that lupus nephritis is not kidney specific in the LPR model with recurrence after transplantation in the absence of immunosuppression.
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Affiliation(s)
- P Hamar
- Institute of Pathophysiology, Department of Medicine, Semmelweis University, Budapest, Hungary.
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Kökény G, Godó M, Nagy E, Kardos M, Kotsch K, Casalis P, Bodor C, Rosivall L, Volk HD, Zenclussen AC, Hamar P. Skin disease is prevented but nephritis is accelerated by multiple pregnancies in autoimmune MRL/LPR mice. Lupus 2007; 16:465-77. [PMID: 17670844 DOI: 10.1177/0961203307079456] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The role of pregnancy in the progression of systemic lupus erythematosus (SLE) is still poorly understood. We analysed the effect of repeated pregnancies in MRL/lpr mice, a murine model of SLE. Seven-week old female mice were used: multiparous mice underwent three consecutive pregnancies (M); age-matched virgin mice served as controls (V). Animals were harvested at 20 weeks of age. Skin lesions were characterized by hair loss and scabs in the dorsum of the neck. Virgin skins showed thickened dermis, fibrosis and mononuclear cell infiltrates, which were practically absent in M. This was accompanied by higher IFN-gamma and lower IL-10 mRNA expression levels in V compared to M skin. Plasma IFN-gamma protein levels were also upregulated in V versus M. However, survival and kidney function were dramatically reduced and accompanied by hypertension after multiple pregnancies. Kidney histology also showed markedly increased renal lesions in M. In contrast to plasma and skin levels, both IL-10 and IFN-gamma mRNA were lower in the kidneys of V versus M mice. Concluding our findings, the pathomechanisms of lupus kidney and skin disease may be regulated differently at the organ level during pregnancy. Both IFN-gamma and IL-10 may be important regulatory cytokines at the local level.
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Affiliation(s)
- G Kökény
- Department of Pathophysiology, Semmelweis University, Budapest, Hungary
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Hamar P, Kokeny G, Liptak P, Krtil J, Adamczak M, Amann K, Ritz E, Gross ML. The Combination of ACE Inhibition plus Sympathetic Denervation Is Superior to ACE Inhibitor Monotherapy in the Rat Renal Ablation Model. ACTA ACUST UNITED AC 2007; 105:e124-36. [PMID: 17347582 DOI: 10.1159/000100494] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2006] [Accepted: 12/07/2006] [Indexed: 11/19/2022]
Abstract
BACKGROUND The blood pressure-independent renoprotective actions of the blockade of the renin-angiotensin and the sympathetic nervous system are well documented, but monotherapies fail to completely abrogate progression. We investigated whether combined inhibition of the two systems provides additive renoprotection. METHODS After subtotal nephrectomy (SNX) or sham operation, rats underwent resection of dorsal roots, i.e. rhizotomy or sham rhizotomy. Subsequently, they received tap water or quinapril in drinking water for 16 weeks (n = 18/group). Albuminuria, blood pressure and kidneys were assessed (morphometry, immunohistochemistry). RESULTS At the end of the study telemetric blood pressure in SNX was 118 +/- 16 mm Hg, in SNX + rhizotomy 110 +/- 10 mm Hg, in SNX + quinapril 103 +/- 9 mm Hg and in SNX + quinapril + rhizotomy 95 +/- 7 mm Hg. Albuminuria in the respective groups was 169 +/- 75, 86 +/- 45, 15 +/- 23 and 5 +/- 4 mg/24 h. The glomerulosclerosis index was 1.40 +/- 0.6, 0.80 +/- 0.23, 0.37 +/- 0.16 and 0.31 +/- 0.15 (p < 0.001). Only combined intervention caused significant reduction of the glomerular volume and podocyte hypertrophy. The lowest indices for nitrotyrosine, NOS-1 (nNOS), TGF-beta and interstitial collagen were seen with combined interventions (p < 0.05). CONCLUSION In angiotensin-converting enzyme inhibitor-treated SNX animals, abrogation of sympathetic overactivity provides additional renoprotection and less nitro-oxidative stress of podocytes than single interventions. The added benefits were partially blood pressure independent.
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Affiliation(s)
- Peter Hamar
- Institute of Pathophysiology, Semmelweis University, Budapest, Hungary.
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Abstract
A new era in genetics has started 15 years ago, when co-suppression in petunia has been discovered. Later, co-suppression was identified as RNA interference (RNAi) in many plant and lower eukaryote animals. Although an ancient antiviral host defense mechanism in plants, the physiologic role of RNAi in mammals is still not completely understood. RNAi is directed by short interfering RNAs (siRNAs), one subtype of short double stranded RNAs. In this review we summarize the history and mechanisms of RNAi. We also aim to highlight the correlation between structure and efficacy of siRNAs. Delivery is the most important obstacle for siRNA based gene therapy. Viral and nonviral deliveries are discussed. In vivo delivery is the next obstacle to clinical trials with siRNAs. Although hydrodynamic treatment is effective in animals, it cannot be used in human therapy. One possibility is organ selective catheterization. The known side effects of synthesized siRNAs are also discussed. Although there are many problems to face in this new field of gene therapy, successful in vitro and in vivo experiments raise hope for treating human disease with siRNA.
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Affiliation(s)
- Zs Rácz
- Institute of Pathophysiology, Semmelweis University of Medicine, Budapest Nagyvarad ter 4, Hungry.
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Huber W, Eckel F, Hennig M, Rosenbrock H, Wacker A, Saur D, Sennefelder A, Hennico R, Schenk C, Meining A, Schmelz R, Fritsch R, Weiss W, Hamar P, Heemann U, Schmid RM. Prophylaxis of contrast material-induced nephropathy in patients in intensive care: acetylcysteine, theophylline, or both? A randomized study. Radiology 2006; 239:793-804. [PMID: 16714461 DOI: 10.1148/radiol.2393041456] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
PURPOSE To prospectively compare the protective effect of acetylcysteine, theophylline, and both agents combined in patients who are admitted to the intensive care unit with at least one risk factor for contrast material-induced nephropathy and who receive at least 100 mL of iodinated contrast medium. MATERIALS AND METHODS Institutional ethics review board approval and informed consent were obtained. A total of 91 patients (mean age, 58.5 years+/-14.8 [standard deviation]; 31 women, 60 men; 150 examinations) were admitted to the intensive care unit with at least one risk factor for contrast-induced nephropathy and received either (a) 200 mg theophylline 30 minutes before contrast medium administration (group T), (b) 600 mg acetylcysteine twice daily on the day of and (if possible) the day before the examination (group A), or (c) both agents combined (group AT). The primary endpoint for this study was the incidence of contrast-induced nephropathy (chi2 test). RESULTS Groups T, A, and AT were comparable with regard to baseline creatinine levels and the amount of contrast medium administered. The incidence of contrast-induced nephropathy in groups T, A, and AT was 2%, 12%, and 4%, respectively, and was significantly lower in group T than in group A (P=.047). There was no significant difference in the incidence of contrast-induced nephropathy between groups A and AT (P=.148) or between groups T and AT (P=.53). For group A, serum creatinine did not change after 12, 24, or 48 hours compared with baseline. Creatinine levels in group T decreased 12 hours (1.19 mg/dL+/-0.58; P=.008) and 48 hours (1.16 mg/dL+/-0.55; P=.034) after contrast material injection compared with baseline (1.25 mg/dL+/-0.61). In group AT, creatinine significantly decreased 24 hours (1.21 mg/dL+/-0.74; P=.003) and 48 hours (1.17 mg/dL+/-0.69; P<.001) after contrast material injection compared with baseline (1.28 mg/dL+/-0.74). Group A had significantly higher maximal increases in creatinine than groups T and AT (P=.014). CONCLUSION For prophylaxis of contrast-induced nephropathy in patients who are admitted to the intensive care unit and who receive 100 mL or more of contrast medium, theophylline is superior to acetylcysteine.
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Affiliation(s)
- Wolfgang Huber
- II. Medizinische Klinik, Institut für Medizinische Statistik und Epidemiologie, Universitaetsklinik Tuebingen, Kinderkardiologie, Munich, Germany.
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Abstract
BACKGROUND Chronic allograft nephropathy (CAN) belongs to the major causes of long-term kidney allograft failure. One of the histologic hallmarks of CAN is interstitial fibrosis, influenced by matrix metalloproteinases (MMPs) that are controlling extracellular matrix (ECM) degradation. Whether MMPs affect the development and progression of CAN is not clear so far. To analyze the role of MMPs in CAN, we investigated the effects of an early and a late application of BAY 12-9566, an inhibitor of MMP-2, -3, and -9 on the development and progression of CAN in a rat kidney-transplantation model. METHODS Fisher kidneys were orthotopically transplanted into Lewis recipients that were treated with BAY 12-9566 (15 mg/kg per day) or vehicle either for the first 10 days after transplantation (early treatment) or from week 12 to week 20 after transplantation (late treatment). Proteinuria was analyzed every 4 weeks up to week 20 after transplantation when kidney grafts were removed for further analysis. RESULTS Early MMP-inhibition resulted in a significantly reduced 24-hour protein excretion that was paralleled by a lower grade of CAN after 20 weeks. However, late MMP inhibition starting at week 12 after transplantation resulted in significantly higher proteinuria and a higher grade of CAN as compared with controls. Furthermore, transforming growth factor-beta and platelet-derived growth factor-B chain mRNA levels were significantly increased in these animals. CONCLUSIONS Inhibition of MMPs early after transplantation reduced the development and progression of CAN but promoted CAN if initiated at later stages. Thus, MMPs are involved in the development and progression of CAN.
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Affiliation(s)
- Jens Lutz
- Department of Nephrology, Klinikum rechts der Isar der Technischen Universität München, Ismaninger Str. 22, 81675 Munich, Germany
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Yao H, Song E, Chen J, Hamar P. Expression of FAP-1 by human colon adenocarcinoma: implication for resistance against Fas-mediated apoptosis in cancer. Br J Cancer 2004; 91:1718-25. [PMID: 15494722 PMCID: PMC2409949 DOI: 10.1038/sj.bjc.6602136] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Although colon carcinoma cells express Fas receptors, they are resistant to Fas-mediated apoptosis. Defects within the intracellular Fas signal transduction may be responsible. We investigated whether the Fas-associated phosphatase-1 (FAP-1), an inhibitor of Fas signal transduction, contributed to this resistance in colon carcinomas. In vivo, apoptosis of cancer cells was detected in situ using terminal deoxynucleotidyltransferase-mediated dUTP nick-end labelling (TUNEL). FAP-1, FasR, and Fas ligand (FasL) were detected using immunohistochemistry. In vitro, colon carcinoma cells were primarily cultured, and their sensitivity to Fas-mediated apoptosis was evaluated by treatment with agonistic anti-FasR CH11 IgM monoclonal antibody in the presence or absence of synthetic Ac-SLV (serine-leucine-valine) tripeptide. Fas-associated phosphatase-1 expression was detected in 20 out of 28 colon adenocarcinomas. In vivo, a positive correlation between the percentage of apoptotic tumour cells and the number of FasL-positive tumour infiltrating lymphocytes was observed in FAP-1 negative cancers, but not in FAP-1-positive ones. Primarily cultured colon cancer cells, which were refractory to CH-11-induced apoptosis, had higher expression of FAP-1 on protein and mRNA levels than the sensitive group. Resistance to Fas-mediated apoptosis in tumour cells could be abolished by Ac-SLV tripetides. Fas-associated phosphatase-1 expression protects colon cancer cells from Fas-mediated apoptosis, and blockade of FAP-1 and FasR interaction sensitises tumour cells to Fas-dependent apoptosis.
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Affiliation(s)
- H Yao
- Department of Oncology, Sun-Yat-Sen Memorial Hospital, Guangzhou, People's Republic of China
| | - E Song
- Department of Surgery, Sun-Yat-Sen Memorial Hospital, Guangzhou, People's Republic of China
| | - J Chen
- Department of Oncology, Sun-Yat-Sen Memorial Hospital, Guangzhou, People's Republic of China
| | - P Hamar
- Institute of Pathophysiology, Department of Medicine, Semmelweis University, Nagyvárad tér 4, Budapest H-1089, Hungary
- Institute of Pathophysiology, Department of Medicine, Semmelweis University, Nagyvárad tér 4, Budapest H-1089, Hungary. E-mail:
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Gross ML, Adamczak M, Rabe T, Harbi NA, Krtil J, Koch A, Hamar P, Amann K, Ritz E. Beneficial Effects of Estrogens on Indices of Renal Damage in Uninephrectomized SHRsp Rats. J Am Soc Nephrol 2004; 15:348-58. [PMID: 14747381 DOI: 10.1097/01.asn.0000105993.63023.d8] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Renal diseases tend to be less severe among premenopausal female patients, compared with male patients. Experimental data on the effects of estrogens on renal damage are controversial, and potential underlying mechanisms have not been fully clarified. Three-month-old, female, uninephrectomized (UNX), sham-operated or ovariectomized (OVX) SHRsp rats were left untreated or received either 17beta-estradiol 3-benzoate (25 micro g/d) or estriol (0.02 mg/d) daily. After 3 mo, indices of renal damage (glomerulosclerosis index and tubulointerstitial damage index) and glomerular geometric parameters were investigated. The expression of desmin, TGF-beta, endothelin-1, collagen IV, endothelial nitric oxide synthase, and estrogen receptors alpha and beta in the glomeruli and tubulointerstitium was immunohistochemically evaluated. Estradiol and estriol did not significantly affect kidney weights or BP. Estradiol and estriol caused significant reductions in albuminuria (vehicle-treated UNX/OVX animals, 25.4 +/- 8.52 mg/24 h; estradiol-treated UNX/OVX animals, 15.37 +/- 6.12 mg/24 h; estriol-treated UNX/OVX animals, 6.54 +/- 2.24 mg/24 h). The glomerulosclerosis index was significantly lower in estriol- and estradiol-treated animals (estradiol-treated UNX/OVX animals, 0.69 +/- 0.16; estriol-treated UNX/OVX animals, 0.21 +/- 0.12; P < 0.05), compared with vehicle-treated animals (1.46 +/- 0.09); the tubulointerstitial damage index exhibited a similar pattern. The mean glomerular volume was significantly less in estrogen-treated animals. UNX/OVX animals demonstrated significantly greater expression of TGF-beta and endothelin-1 in immunohistochemical, in situ hybridization, and reverse transcription-PCR assays. This increase was abrogated by estriol but not estradiol. Similarly, significantly higher glomerular and tubulointerstitial expression of proliferating cell nuclear antigen and collagen IV was observed in UNX/OVX animals, and expression was decreased by estriol but not estradiol. It was concluded that, in the UNX model of spontaneous renal damage, glomerular lesions and glomerular hypertrophy were reduced by estriol but less consistently by estradiol. In parallel, loss of podocytes, evidence of podocyte injury (i.e., desmin expression), and expression of mediator systems of glomerular damage were decreased, pointing to a major renoprotective action of estriol.
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Affiliation(s)
- Marie-Luise Gross
- Departments of Pathology and Internal Medicine, University of Heidelberg, Heidelberg, Germany.
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Bagi Z, Hamar P, Antus B, Rosivall L, Koller A. Chronic renal failure leads to reduced flow-dependent dilation in isolated rat skeletal muscle arterioles due to lack of NO mediation. Kidney Blood Press Res 2003; 26:19-26. [PMID: 12697973 DOI: 10.1159/000069762] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/29/2002] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Chronic renal failure (CRF) is frequently accompanied by systemic vascular alterations which further increase the morbidity and mortality of these patients. However, the nature and the underlying mechanisms of vascular dysfunction are not completely understood. We hypothesized that--in addition to other factors--CRF alters local vasomotor mechanisms that are intrinsic to the vascular wall. METHODS Changes in the diameter of isolated, pressurized (at 80 mm Hg) gracilis skeletal muscle arterioles (diameter approximately 150 microm) of female Wistar rats were investigated by videomicroscopy. Arteriolar responses to an increase in flow and vasoactive agents in partially nephrectomized (NX) and sham-operated (control) rats were compared. RESULTS In NX rats, serum creatinine and urine protein excretion were increased. Compared to controls, increases in intraluminal flow (from 0 to 40 microl/min) resulted in significantly reduced dilation in arterioles of NX rats (maximum: 32 +/- 4 vs. 15 +/- 4 microm, p < 0.05). Inhibition of nitric oxide (NO) synthesis with L-NAME reduced the dilation of control arterioles but did not affect responses of NX arterioles. Also, dilations in response to histamine were significantly reduced in arterioles from NX rats as compared to control rats. L-NAME significantly decreased histamine-induced dilations of control arterioles, but it did not affect responses of NX arterioles. Dilations in response to the NO donor sodium nitroprusside were also significantly decreased in NX arterioles as compared to responses of control vessels, whereas responses to adenosine and norepinephrine were not significantly different in the two groups. CONCLUSIONS We conclude that in rat skeletal muscle arterioles, CRF induced by renal mass reduction alters the mechanosensitive and agonist-induced responses of peripheral arterioles, in part by interfering with NO-signaling mechanisms. These alterations could contribute to increased peripheral vascular resistance and further aggravate the cardiovascular complications in CRF.
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Affiliation(s)
- Zsolt Bagi
- Department of Pathophysiology, Semmelweis University, Budapest, Hungary.
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Abstract
BACKGROUND Breast cancer is the most common malignant disease of women. Pathologic response of breast cancer to chemotherapy has a great prognostic importance. Glutathion S Transferases (GSTs) might detoxify chemotherapeutic drugs within the cancer cells, thus contributing to chemotherapy resistance. The pi isoenzyme of GSTs seems to be of great relevance. Thus, we hypothesized that GSTpi expression in cancer biopsy can be a prognostic indicator for resistance to chemotherapy. To test this hypothesis, we evaluated before and after chemotherapy, tumor size, apoptosis of tumor cells with TUNEL assay, and proliferation of tumor cells by determining PCNA expression in biopsy samples, or in the surgically removed tumor tissue of GSTpi (-), and GSTpi (+) cases. MATERIALS AND METHODS GSTpi immunoreactivity was determined in 42 female patients with breast cancer. Patients were divided into two groups according to the expression of GSTpi in the pre-treatment biopsy specimen: (+) (n = 22) and (n = 20) samples were analyzed. Surgery was performed 2 weeks after a single intravenous injection of the chemotherapeutic drugs [5-fluorouracil, adriamycin, mitomycin (FAM protocol)]. RESULTS Pre-chemotherapy values of tumor size, apoptosis, or proliferation did not differ between GSTpi (-) and (+) samples. Chemotherapy significantly inhibited tumor growth, and cell proliferation, and induced apoptosis in GSTpi (-) cases. However, these effects were significantly reduced in GSTpi (+) patients. CONCLUSION These results suggest, that the presence of GSTpi in breast cancer tissue is a bad prognostic indicator, and these tumors are largely resistant to chemotherapy. Thus, GSTpi might be important in inactivating one or more of the chemotherapeutic agents used in this treatment.
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Affiliation(s)
- Fengxi Su
- Department of Surgery, Sun-Yat-Sen Memorial Hospital, Sun-Yat-Sen University of Medical Science, Guangzhou, People's Republic of China
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45
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Abstract
BACKGROUND Female sex hormones may influence the progression of renal diseases. We therefore evaluated the effects of estradiol on the development of glomerulosclerosis in a remnant kidney model. METHODS Ovariectomized or intact female Wistar rats underwent 5/6 nephrectomy. Ovariectomized animals were treated with vehicle, 17beta-estradiol alone or in combination with progesterone, intact rats received vehicle only. Twenty-four weeks after renal ablation, histological as well as molecular analysis were performed. RESULTS Vehicle-treated ovariectomized animals developed severe proteinuria and glomerulosclerosis as compared with vehicle-treated intact rats. In addition, renal mRNA levels of platelet-derived growth factor-A chain (PDGF-A) were increased. Estradiol replacement reduced proteinuria, which was paralleled by a diminished glomerular injury and reduced transforming growth factor-beta1 (TGF-beta1) and PDGF-A mRNA expression. In animals that received combined hormone treatment there were no significant differences in proteinuria, creatinine clearance, renal histopathology and growth factor mRNA levels compared with those measured in vehicle-treated ovariectomized rats. Serum cholesterol and triglyceride levels were comparable between all groups during the whole follow-up period. CONCLUSIONS The data suggest that estrogens protect against the development of glomerulosclerosis in the rat remnant kidney model.
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Affiliation(s)
- Balazs Antus
- Department of Pathophysiology, Semmelweis University, Budapest, Hungary.
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Hamar P, Szabo A, Muller V, Heemann U. The involvement of activated T cells and growth-factor production in the early and late phase of chronic kidney allograft nephropathy in rats. Transpl Int 2002. [DOI: 10.1111/j.1432-2277.2002.tb00198.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Affiliation(s)
- P Hamar
- Department of Nephrology, University Hospital, Essen, Germany
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Hamar P, Peti-Peterdi J, Szabó A, Becker G, Flach R, Rosivall L, Heemann U. Interleukin-2-dependent mechanisms are involved in the development of glomerulosclerosis after partial renal ablation in rats. Exp Nephrol 2001; 9:133-41. [PMID: 11150862 DOI: 10.1159/000052604] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
BACKGROUND Glomerulosclerosis is a common feature of many end-stage renal diseases. The contribution of cellular immune mechanisms has been implicated in the development of glomerulosclerosis. We investigated whether the inhibition of lymphocyte activation influences this process in an established rat model of renal hyperfiltration. METHODS After removal of two-thirds of their respective kidney mass, rats were treated with either tacrolimus (0.08 mg/kg/day) or vehicle until the end of the study (n = 10/group). The rats were pair-fed and proteinuria was assessed regularly. Twenty weeks after nephrectomy, creatinine clearance and systemic blood pressure were determined, and kidneys were harvested for morphological, immunohistological and PCR analysis. RESULTS In control animals, renal function started to decline from week 12, as indicated by an elevated proteinuria. Interleukin (IL)-2 and IL-2 receptor synthesis was upregulated in control animals and inhibited by tacrolimus treatment. Transforming growth factor-beta (TGF-beta(1)), platelet-derived growth factor-AA (PDGF-AA) and macrophage chemoattractant protein-1 (MCP-1) mRNA levels were upregulated in control animals, but were significantly lower in immunosuppressed hosts. Additionally, tacrolimus treatment resulted in a significant reduction of proteinuria. Morphological analysis supported these functional results; glomerular sclerosis, tubular atrophy and intimal proliferation were more pronounced in controls than in the tacrolimus group. These morphological parameters were accompanied by reduced infiltration of CD5+ (rat T-cell marker) T cells, ED1+ (rat macrophage marker) macrophages, and less intense staining for laminin and fibronectin. CONCLUSION A continuous treatment with tacrolimus - an inhibitor of lymphocyte proliferation - reduced the pace of glomerulosclerosis in the remnant kidney.
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Affiliation(s)
- P Hamar
- Department of Nephrology, University Hospital, Essen, Germany
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Abstract
OBJECTIVE After intravenous (i.v.) injection of lipopolysaccharide (LPS) macrophages release nitric oxide (NO) due to the expression of the inducible NO synthase (iNOS). After LPS NO is abundantly produced also in the cardiovascular system and may contribute to the development of hypotension and shock. Since the immune response, the synthesis of NO and the regulation of blood pressure (BP) differ between males and females, in the present study the effect of LPS on BP, renal function, the plasma and urinary concentration of the metabolites of NO as well as the splenic and aortic expression of the iNOS gene were compared between male and female rats. METHODS BP and renal function were measured in anesthetized rats following the i.v. injection of LPS (E. coli, 4 mg/kg). The NO2- and NO3- (metabolites of NO=NOx) concentration was measured by the Griess reaction. The iNOS gene expression was studied by RT-PCR. RESULTS Four hours after LPS, BP of males (n=9) was reduced by 63+/-12 mmHg versus 10+/-4 in females (n=7, P<0.005). Aminoguanidine, a selective inhibitor of iNOS, prevented the reduction of BP in males. The plasma concentration of NOx (P(NOx)), microM) was lower in hypotensive males (128+/-20) than in normotensive females (235+/-29, P<0.005). Males also exhibited lower urinary NOx excretion (U(NOx)V) after LPS (P<0.001 vs. females). Prior castration of males provided protection against hypotension (fall of BP: -4+/-4 mmHg, n=6, P<0.02 versus males) and resulted in higher P(NOx) as well as U(NOx)V (both P<0.001 versus males and not different from females). Prior ovariectomy (n=5) had no influence on the hemodynamic and NOx response to LPS. Male rats displayed enhanced aortic iNOS/beta-actin ratio relative to females after LPS (n=3 in each group, P<0.05). CONCLUSIONS (1) Male gender may sensitize to LPS-induced shock and (2) sensitivity of males to endotoxin is associated with an attenuated, not exaggerated total rate of NO synthesis.
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Affiliation(s)
- G Losonczy
- Department of Physiology, West Virginia University, 26506-9229, Morgantown, WV, USA.
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Abstract
Chronic rejection is the major cause of graft loss after kidney transplantation. Various immunosuppressive protocols have been used to ameliorate this process. We investigated whether cyclosporin A- (CyA) or azathioprine- (Aza) based immunosuppression is better able to slow the progression of chronic rejection. Fisher kidneys were transplanted into bilaterally nephrectomized Lewis rats. Recipients received CyA (1.5 mg/kg/day, s.c.) for 10 days, and were treated from day 11 with either CyA (1.5 mg/kg)+pred (0.15 mg/kg) (C+P),Aza (2 mg/kg)+pred (A+P), vehicle+pred (P), or vehicle alone (controls) (n = 8/group). Proteinuria was regularly assessed and grafts were harvested for morphological, immunohistological, and molecular biological analysis at week 24. By week 12 proteinuria had increased to significant levels. At week 24, proteinuria was significantly lower and creatinine clearance was significantly higher in C+P and A+P, than in P or controls. Morphological analysis supported these functional results: at week 24, glomerulopathy, tubular atrophy and intimal proliferation (as assessed according to the BANFF score) were less pronounced in C+P and A+P, as compared with P or controls. These morphological parameters were accompanied by a reduced infiltration of ED-1+ macrophages and CD-5+ T lymphocytes. In P or controls the synthesis of IL-2Ralpha mRNA was markedly elevated at this time. In parallel to the reduced cellular infiltration, IL-2Ralpha mRNA expression was markedly inhibited, both, in C+P and A+P. There were no significant differences between C+P and A+P regarding the parameters studied. In conclusion, both C+P and A+P reduced the infiltration of activated T lymphocytes, and the pace of chronic kidney allograft rejection. The outcome of C+P and A+P based therapy did not differ significantly.
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Affiliation(s)
- P Hamar
- Department of Nephrology, University Hospital Essen, Germany
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