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Jeon MJ, Choi YS, Kim ID, Criswell T, Atala A, Yoo JJ, Jackson JD. Engineering Functional Rat Ovarian Spheroids Using Granulosa and Theca Cells. Reprod Sci 2021; 28:1697-1708. [PMID: 33511540 DOI: 10.1007/s43032-020-00445-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 06/29/2020] [Accepted: 12/20/2020] [Indexed: 11/25/2022]
Abstract
Although menopausal hormone therapy (MHT) is the most effective approach to managing the loss of ovarian activity, serious side effects have been reported. Cell-based therapy is a promising alternative for MHT. This study constructed engineered ovarian cell spheroids and investigated their endocrine function. Theca and granulosa cells were isolated from ovaries of 10-week-old rats. Two types of engineered ovarian cell spheroids were fabricated through forced aggregation in microwells, multilayered spheroids with centralized granulosa aggregates surrounded by an outer layer of theca cells and mixed ovarian spheroids lacking spatial rearrangement. The ovarian cell spheroids were encapsulated into a collagen gel. Non-aggregated ovarian cells served as controls. The endocrine function of the engineered ovarian spheroids was assessed over 30 days. The structure of the spheroids was well maintained during culture. The secretion of 17β-estradiol from both types of engineered ovarian cell spheroids was higher than in the control group and increased continuously in a time-dependent manner. Secretion of 17β-estradiol in the multi-layered ovarian cell spheroids was higher than in the non-layered constructs. Increased secretion of progesterone was detected in the multi-layered ovarian cell spheroids at day 5 of culture and was sustained during the culture period. The initial secretion level of progesterone in the non-layered ovarian cell spheroids was similar to those from the controls and increased significantly from days 21 to 30. An in vitro rat model of engineered ovarian cell spheroids was developed that was capable of secreting sex steroid hormones, indicating that the hormone secreting function of ovaries can be recapitulated ex vivo and potentially adapted for MHT.
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Affiliation(s)
- Myung Jae Jeon
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, NC, 27101, USA
- Department of Obstetrics and Gynecology, Seoul National University College of Medicine, 101, Daehak-ro, Jong-gu, Seoul, 110-799, Republic of Korea
| | - Young Sik Choi
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, NC, 27101, USA
- Department of Obstetrics and Gynecology, Yonsei University College of Medicine, Seoul, 120-752, Republic of Korea
- Institute of Women's Life Medical Science, Yonsei University College of Medicine, Seoul, 120-752, Republic of Korea
| | - Il Dong Kim
- Department of Obstetrics and Gynecology, Bundang Jeaseng General Hospital, 20, Seohyeon-ro 180beon-gil, Bundang-gu, Seognam-si, Gyeonggi-do, 13590, Republic of Korea
| | - Tracy Criswell
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, NC, 27101, USA
| | - Anthony Atala
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, NC, 27101, USA
| | - James J Yoo
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, NC, 27101, USA
| | - John D Jackson
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, NC, 27101, USA.
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Nakamura K, O'Neill AM, Williams MR, Cau L, Nakatsuji T, Horswill AR, Gallo RL. Short chain fatty acids produced by Cutibacterium acnes inhibit biofilm formation by Staphylococcus epidermidis. Sci Rep 2020; 10:21237. [PMID: 33277548 PMCID: PMC7718897 DOI: 10.1038/s41598-020-77790-9] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [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: 09/21/2020] [Accepted: 11/12/2020] [Indexed: 12/11/2022] Open
Abstract
Biofilm formation by bacterial pathogens is associated with numerous human diseases and can confer resistance to both antibiotics and host defenses. Many strains of Staphylococcus epidermidis are capable of forming biofilms and are important human pathogens. Since S. epidermidis coexists with abundant Cutibacteria acnes on healthy human skin and does not typically form a biofilm in this environment, we hypothesized that C. acnes may influence biofilm formation of S. epidermidis. Culture supernatants from C. acnes and other species of Cutibacteria inhibited S. epidermidis but did not inhibit biofilms by Pseudomonas aeruginosa or Bacillus subtilis, and inhibited biofilms by S. aureus to a lesser extent. Biofilm inhibitory activity exhibited chemical properties of short chain fatty acids known to be produced from C. acnes. The addition of the pure short chain fatty acids propionic, isobutyric or isovaleric acid to S. epidermidis inhibited biofilm formation and, similarly to C. acnes supernatant, reduced polysaccharide synthesis by S. epidermidis. Both short chain fatty acids and C. acnes culture supernatant also increased sensitivity of S. epidermidis to antibiotic killing under biofilm-forming conditions. These observations suggest the presence of C. acnes in a diverse microbial community with S. epidermidis can be beneficial to the host and demonstrates that short chain fatty acids may be useful to limit formation of a biofilm by S. epidermidis.
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Affiliation(s)
- Kouki Nakamura
- Department of Dermatology, University of California San Diego, 9500 Gillman Dr. #0869, La Jolla, CA, 92093, USA
| | - Alan M O'Neill
- Department of Dermatology, University of California San Diego, 9500 Gillman Dr. #0869, La Jolla, CA, 92093, USA
| | - Michael R Williams
- Department of Dermatology, University of California San Diego, 9500 Gillman Dr. #0869, La Jolla, CA, 92093, USA
| | - Laura Cau
- Department of Dermatology, University of California San Diego, 9500 Gillman Dr. #0869, La Jolla, CA, 92093, USA
- SILAB, R&D Department, Brive, France
| | - Teruaki Nakatsuji
- Department of Dermatology, University of California San Diego, 9500 Gillman Dr. #0869, La Jolla, CA, 92093, USA
| | - Alexander R Horswill
- Department of Immunology and Microbiology, University of Colorado School of Medicine, Aurora, USA
| | - Richard L Gallo
- Department of Dermatology, University of California San Diego, 9500 Gillman Dr. #0869, La Jolla, CA, 92093, USA.
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Jin S, Yang C, Huang J, Liu L, Zhang Y, Li S, Zhang L, Sun Q, Yang P. Conditioned medium derived from FGF-2-modified GMSCs enhances migration and angiogenesis of human umbilical vein endothelial cells. Stem Cell Res Ther 2020; 11:68. [PMID: 32070425 PMCID: PMC7029497 DOI: 10.1186/s13287-020-1584-3] [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: 11/15/2019] [Revised: 01/19/2020] [Accepted: 02/04/2020] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Angiogenesis plays an important role in tissue repair and regeneration, and conditioned medium (CM) derived from mesenchymal stem cells (MSC-CM) possesses pro-angiogenesis. Nevertheless, the profile and concentration of growth factors in MSC-CM remain to be optimized. Fibroblast growth factor-2 (FGF-2) has been proven to be an effective angiogenic factor. Thus, the aim of this study was to verify whether FGF-2 gene overexpression optimized CM from human gingival mesenchymal stem cells (hGMSCs) and whether such optimized CM possessed more favorable pro-angiogenesis effect. METHODS First, FGF-2 gene-modified hGMSCs were constructed using lentiviral transfection technology (LV-FGF-2+-hGMSCs) and the concentration of angiogenesis-related factors in LV-FGF-2+-hGMSC-CM was determined by ELISA. Then, human umbilical vein endothelial cells (HUVECs) were co-cultured for 3 days with LV-FGF-2+-hGMSC-CM, and the expression level of placenta growth factor (PLGF), stem cell factor (SCF), vascular endothelial growth factor receptor 2 (VEGFR2) in HUVECs were determined by qRT-PCR, western blot, and cellular immunofluorescence techniques. The migration assay using transwell and in vitro tube formation experiments on matrigel matrix was conducted to determine the chemotaxis and angiogenesis enhanced by LV-FGF-2+-hGMSC-CM. Finally, NOD-SCID mice were injected with matrigel mixed LV-FGF-2+-hGMSC-CM, and the plug sections were analyzed by immunohistochemistry staining with anti-human CD31 antibody. RESULTS LV-FGF-2+-hGMSC-CM contained significantly more FGF-2, vascular endothelial growth factor A (VEGF-A), and transforming growth factor β (TGF-β) than hGMSC-CM. HUVECs pretreated with LV-FGF-2+-hGMSC-CM expressed significantly more PLGF, SCF, and VEGFR2 at gene and protein level than hGMSC-CM pretreated HUVECs. Compared with hGMSC-CM, LV-FGF-2+-hGMSC-CM presented significantly stronger chemotaxis to HUVECs and significantly strengthened HUVECs mediated in vitro tube formation ability. In vivo, LV-FGF-2+-hGMSC-CM also possessed stronger promoting angiogenesis ability than hGMSC-CM. CONCLUSIONS Overexpression of FGF-2 gene promotes hGMSCs paracrine of angiogenesis-related growth factors, thereby obtaining an optimized conditioned medium for angiogenesis promotion.
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Affiliation(s)
- Shanshan Jin
- Department of Periodontology, School and Hospital of Stomatology, Shandong University, No.44-1 Wenhua Road West, Jinan, 250012, Shandong, China
- Shandong Provincial Key Laboratory of Oral Tissue Regeneration, Jinan, Shandong, China
- Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, Shandong, China
| | - Chengzhe Yang
- Department of Stomatology, Qilu Hospital of Shandong University, Jinan, Shandong, China
| | - Jiahui Huang
- Department of Periodontology, School and Hospital of Stomatology, Shandong University, No.44-1 Wenhua Road West, Jinan, 250012, Shandong, China
- Shandong Provincial Key Laboratory of Oral Tissue Regeneration, Jinan, Shandong, China
- Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, Shandong, China
| | - Lianlian Liu
- Department of Periodontology, School and Hospital of Stomatology, Shandong University, No.44-1 Wenhua Road West, Jinan, 250012, Shandong, China
- Shandong Provincial Key Laboratory of Oral Tissue Regeneration, Jinan, Shandong, China
- Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, Shandong, China
| | - Yu Zhang
- Department of Periodontology, School and Hospital of Stomatology, Shandong University, No.44-1 Wenhua Road West, Jinan, 250012, Shandong, China
- Shandong Provincial Key Laboratory of Oral Tissue Regeneration, Jinan, Shandong, China
- Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, Shandong, China
| | - Shutong Li
- Department of Periodontology, School and Hospital of Stomatology, Shandong University, No.44-1 Wenhua Road West, Jinan, 250012, Shandong, China
- Shandong Provincial Key Laboratory of Oral Tissue Regeneration, Jinan, Shandong, China
- Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, Shandong, China
| | - Liguo Zhang
- Department of Periodontology, School and Hospital of Stomatology, Shandong University, No.44-1 Wenhua Road West, Jinan, 250012, Shandong, China
- Shandong Provincial Key Laboratory of Oral Tissue Regeneration, Jinan, Shandong, China
- Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, Shandong, China
| | - Qinfeng Sun
- Department of Periodontology, School and Hospital of Stomatology, Shandong University, No.44-1 Wenhua Road West, Jinan, 250012, Shandong, China.
- Shandong Provincial Key Laboratory of Oral Tissue Regeneration, Jinan, Shandong, China.
- Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, Shandong, China.
| | - Pishan Yang
- Department of Periodontology, School and Hospital of Stomatology, Shandong University, No.44-1 Wenhua Road West, Jinan, 250012, Shandong, China.
- Shandong Provincial Key Laboratory of Oral Tissue Regeneration, Jinan, Shandong, China.
- Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, Shandong, China.
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Lang T. Analysis of Secreted MIF from Cultured Murine Bone Marrow-Derived Immune Cells. Methods Mol Biol 2020; 2080:39-46. [PMID: 31745869 DOI: 10.1007/978-1-4939-9936-1_4] [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] [Indexed: 06/10/2023]
Abstract
Macrophage migration inhibitory factor (MIF) is expressed and released ubiquitously by numerous cell types and tissues. MIF is detected and constitutively expressed at the protein level both intra- and extracellularly. This chapter outlines methods for cultivating, purifying, detecting, and quantifying concentrations of MIF from murine primary derived macrophages and dendritic cell culture supernatants.
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Affiliation(s)
- Tali Lang
- The Szalmuk Family Department of Medical Oncology, Level 2, Cabrini Institute, Malvern, VIC, Australia.
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Brandi J, Manfredi M, Speziali G, Gosetti F, Marengo E, Cecconi D. Proteomic approaches to decipher cancer cell secretome. Semin Cell Dev Biol 2017; 78:93-101. [PMID: 28684183 DOI: 10.1016/j.semcdb.2017.06.030] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [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: 05/31/2017] [Revised: 06/30/2017] [Accepted: 06/30/2017] [Indexed: 01/17/2023]
Abstract
In this review, we give an overview of the actual proteomic approaches used in the study of cancer cells secretome. In particular, we describe the proteomic strategies to decipher cancer cell secretome initially focusing on the different aspects of sample preparation. We examine the issues related to the presence of low abundant proteins, the analysis of secreted proteins in the conditioned media with or without the removal of fetal bovine serum and strategies developed to reduce intracellular protein contamination. As regards the identification and quantification of secreted proteins, we described the different proteomic approaches used, i.e. gel-based, MS-based (label-based and label-free), and the antibody and array-based methods, together with some of the most recent applications in the field of cancer research. Moreover, we describe the bioinformatics tools developed for the in silico validation and characterization of cancer cells secretome. We also discuss the most important available tools for protein annotation and for prediction of classical and non-classical secreted proteins. In summary in this review advances, concerns and challenges in the field of cancer secretome analysis are discussed.
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Affiliation(s)
- Jessica Brandi
- Department of Biotechnology, Proteomics and Mass Spectrometry Lab, University of Verona, Strada le Grazie 15, 37135, Verona, Italy
| | - Marcello Manfredi
- Department of Sciences and Technological Innovation, University of Piemonte Orientale, Viale T. Michel 11, 15121, Alessandria, Italy; ISALIT S.r.l., Novara, Italy.
| | - Giulia Speziali
- Department of Biotechnology, Proteomics and Mass Spectrometry Lab, University of Verona, Strada le Grazie 15, 37135, Verona, Italy
| | - Fabio Gosetti
- Department of Sciences and Technological Innovation, University of Piemonte Orientale, Viale T. Michel 11, 15121, Alessandria, Italy
| | - Emilio Marengo
- Department of Sciences and Technological Innovation, University of Piemonte Orientale, Viale T. Michel 11, 15121, Alessandria, Italy
| | - Daniela Cecconi
- Department of Biotechnology, Proteomics and Mass Spectrometry Lab, University of Verona, Strada le Grazie 15, 37135, Verona, Italy
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Abstract
Pancreatic cancer is a common cause of cancer-related mortality. Omental spread is frequent and usually represents an ominous event, leading to patient death. Omental metastasis has been studied in ovarian cancer, but data on its role in pancreatic cancer are relatively scarce and the molecular biology of this process has yet to be explored. We prepared tissue explants from human omental fat, and used conditioned medium from the explants for various in vitro and in vivo experiments designed to evaluate pancreatic cancer development, growth, and survival. Mass spectrometry identified the fat secretome, and mRNA array identified specific fat-induced molecular alternations in tumor cells. Omental fat increased pancreatic cancer cellular growth, migration, invasion, and chemoresistance. We identified diverse potential molecules secreted by the omentum, which are associated with various pro-tumorigenic biological processes. Our mRNA array identified specific omental-induced molecular alternations that are associated with cancer progression and metastasis. Omental fat increased the expression of transcription factors, mRNA of extracellular matrix proteins, and adhesion molecules. In support with our in vitro data, in vivo experiments demonstrated an increased pancreatic cancer tumor growth rate of PANC-1 cells co-cultured for 24 hours with human omental fat conditioned medium. Our results provide novel data on the role of omental tissue in omental metastases of pancreatic cancer. They imply that omental fat secreted factors induce cellular reprogramming of pancreatic cancer cells, resulting in increased tumor aggressiveness. Understanding the mechanisms of omental metastases may enable us to discover new potential targets for therapy.
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Affiliation(s)
- Valerya Feygenzon
- Sackler School of Medicine, The Nicholas and Elizabeth Cathedra of Experimental Surgery, Tel Aviv University, Tel Aviv, Israel
| | - Shelly Loewenstein
- Department of Surgery, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
- * E-mail:
| | - Nir Lubezky
- Sackler School of Medicine, The Nicholas and Elizabeth Cathedra of Experimental Surgery, Tel Aviv University, Tel Aviv, Israel
- Department of Surgery, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | | | - Osnat Sher
- Sackler School of Medicine, The Nicholas and Elizabeth Cathedra of Experimental Surgery, Tel Aviv University, Tel Aviv, Israel
- Department of Pathology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Joseph M. Klausner
- Sackler School of Medicine, The Nicholas and Elizabeth Cathedra of Experimental Surgery, Tel Aviv University, Tel Aviv, Israel
- Department of Surgery, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Guy Lahat
- Sackler School of Medicine, The Nicholas and Elizabeth Cathedra of Experimental Surgery, Tel Aviv University, Tel Aviv, Israel
- Department of Surgery, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
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Lertsuwan K, Choe LH, Marwa IR, Lee K, Sikes RA. Identification of Fibulin-1 as a Human Bone Marrow Stromal (HS-5) Cell-Derived Factor That Induces Human Prostate Cancer Cell Death. Prostate 2017; 77:729-742. [PMID: 28168724 DOI: 10.1002/pros.23303] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2016] [Accepted: 12/22/2016] [Indexed: 12/14/2022]
Abstract
BACKGROUND Previous studies showed that human bone marrow stromal HS-5 cells secreted unidentified factor(s) inducing PCa cell death. Herein, the HS-5-derived factor (HS-5 DF) was characterized and identified. METHODS Conditioned media from confluent HS-5 cells were collected and modified for biochemical characteristic testing of HS-5 DF. Cell survival was measured by apoptosis assay and live/dead assay. Fibulin-1 was identified from gel electrophoresis and mass spectrometry. The validation of Fibulin-1 as a HS-5 DF was done by immunoprecipitation (IP) and genetic knockdown by CRISPR/Cas9 system. RESULTS HS-5 DF was trypsin and heat sensitive, but pH stable. The tentative size of the factor fell between 30 kDa and 100 kDa. TGF-β1 treatment led to a suppression of HS-5 DF activity, a property consistent with bone metastasis in prostate cancer. Examination of TGF-β1 down regulated proteins led to identification of fibulin-1 as a candidate for the DF. IP of Fibulin-1 from HS-5 CM and CRISPR knockdown of Fibulin-1 showed a significant reduction of HS-5 CM-derived PCa cell death. These results strongly support a role for fibulin-1 in HS-5 bone marrow stromal cell induction of PCa cell death. CONCLUSION Our data indicate that Fibulin-1 functions as a HS-5 bone marrow stromal cell-derived factor inducing prostate cancer cell death. Prostate 77:729-742, 2017. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Kornkamon Lertsuwan
- Department of Biological Sciences, Center for Translational Cancer Research, University of Delaware, Newark, Delaware
- Department of Biological Sciences, Laboratory for Cancer Ontogeny and Therapeutics, University of Delaware, Newark, Delaware
| | - Leila H Choe
- Delaware Biotechnology Institute, Newark, Delaware
| | - Irene R Marwa
- Department of Biological Sciences, Center for Translational Cancer Research, University of Delaware, Newark, Delaware
- Department of Biological Sciences, Laboratory for Cancer Ontogeny and Therapeutics, University of Delaware, Newark, Delaware
| | - Kelvin Lee
- Delaware Biotechnology Institute, Newark, Delaware
| | - Robert A Sikes
- Department of Biological Sciences, Center for Translational Cancer Research, University of Delaware, Newark, Delaware
- Department of Biological Sciences, Laboratory for Cancer Ontogeny and Therapeutics, University of Delaware, Newark, Delaware
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Carpenter PM, Sivadas P, Hua SS, Xiao C, Gutierrez AB, Ngo T, Gershon PD. Migration of breast cancer cell lines in response to pulmonary laminin 332. Cancer Med 2017; 6:220-234. [PMID: 27878981 PMCID: PMC5269569 DOI: 10.1002/cam4.957] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [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: 05/18/2016] [Revised: 10/10/2016] [Accepted: 10/14/2016] [Indexed: 02/06/2023] Open
Abstract
Because tumor cell motility is a requirement for metastasis, we hypothesized that lung tissue harbors substances that induce tumor cell migration. MCF-7 breast carcinoma cells exposed to small airway epithelial cells and conditioned medium exhibited dose-dependent tumor cell migration. Among the extracellular matrix proteins in the conditioned medium identified by mass spectrometry, laminin 332 (LM332) had the greatest contribution to the migration of MCF-7 cells. Immunoblotting and immunohistochemistry for LM332-specific chains identified LM332 in the lung and in pulmonary epithelial cells. Antibodies to either LM332 or its integrin receptor inhibited MCF-7 motility, and knockdown of LM332 chains also reduced its migration-inducing activity. Taken together, these findings implicate LM332 as a component of lung tissue that can induce motility in breast carcinoma cells that have been transported to lung during metastasis. Earlier studies on LM332 in tumor progression have examined LM332 expression in tumor cells. This investigation, in comparison, provides evidence that the tumor promoting potential of LM332 may originate in the lung microenvironment rather than in tumor cells alone. Furthermore, this study provides evidence that the motility-inducing properties of the microenvironment can reside in epithelial cells. The findings raise the possibility that LM332 plays a role in the pulmonary metastases of breast carcinoma and may provide a target for antimetastasis therapy.
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Affiliation(s)
- Philip M. Carpenter
- Department of PathologyKeck School of Medicine, the University of Southern CaliforniaLos AngelesCalifornia
- Department of PathologyUniversity of CaliforniaIrvineCalifornia
| | - Priyanka Sivadas
- Department of PathologyKeck School of Medicine, the University of Southern CaliforniaLos AngelesCalifornia
| | - Spencer S. Hua
- Department of PathologyUniversity of CaliforniaIrvineCalifornia
| | - Cally Xiao
- Department of Pharmacology and Experimental TherapeuticsUniversity Hospital of CologneCologneGermany
| | | | - Tuan Ngo
- Department of Molecular Biology and BiochemistryUniversity of CaliforniaIrvineCalifornia
| | - Paul D. Gershon
- Department of Molecular Biology and BiochemistryUniversity of CaliforniaIrvineCalifornia
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Marciniak E, Hasiec M, Fülöp F, Misztal T. Salsolinol-a potential inhibitor of the gonadotropic axis in sheep during lactation. Domest Anim Endocrinol 2017; 58:97-103. [PMID: 27792889 DOI: 10.1016/j.domaniend.2016.09.003] [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] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Revised: 09/22/2016] [Accepted: 09/23/2016] [Indexed: 11/28/2022]
Abstract
This study tested the hypothesis that salsolinol, a derivative of dopamine, affects GnRH and LH secretion in lactating sheep. In the in vivo experiment, the structural analogue of salsolinol, 1-methyl-3,4-dihydroisoquinoline (1-MeDIQ), was infused into the infundibular nucleus-median eminence of sheep at the fifth wk of lactation to antagonize salsolinol's action. Simultaneously, cerebrospinal fluid from the third brain ventricle, to determine GnRH concentration, and plasma samples, to measure LH concentration, were collected. In the in vitro experiment, the anterior pituitary (AP) explants from weaned sheep were incubated in culture medium containing 2 doses of salsolinol, 20 and 100 μg/mL (S20 and S100, respectively). The concentration of LH in the collected media and relative expression of LHβ subunit messenger RNA in the AP explants were determined. No significant difference was found in mean GnRH concentration in response to 1-MeDIQ infusion, but both mean plasma LH concentration and LH pulse frequency increased significantly (P < 0.001 and P < 0.05, respectively) compared with those in controls. Significantly higher LH concentrations occurred during the first (P < 0.001), second (P < 0.001), and fourth (P < 0.05) h of 1-MeDIQ infusion. In the in vitro study, both the S20 and S100 doses of salsolinol caused a significant decrease in the mean medium LH concentration compared with that in the control (P < 0.01 and P < 0.001, respectively). Salsolinol had no effect on the relative LHβ subunit messenger RNA expression in the incubated tissue. In conclusion, salsolinol is a potential inhibitor of the secretory activity of the gonadotropic axis in lactating sheep, at least at the AP level. Although no significant changes in GnRH release were directly confirmed, an increase in the frequency of LH pulses does not allow to exclude the central action of salsolinol.
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Affiliation(s)
- E Marciniak
- Department of Endocrinology, The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, Jablonna, Poland
| | - M Hasiec
- Department of Endocrinology, The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, Jablonna, Poland
| | - F Fülöp
- Institute of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Szeged, Szeged, Hungary
| | - T Misztal
- Department of Endocrinology, The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, Jablonna, Poland.
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Zhang W, Mazella J, Kloosterboer HJ, Tseng L. Progestagenic Effects of Tibolone are Target Gene—Specific In Human Endometrial Cells. ACTA ACUST UNITED AC 2016; 13:459-65. [PMID: 16879988 DOI: 10.1016/j.jsgi.2006.05.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [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: 03/10/2006] [Indexed: 11/25/2022]
Abstract
OBJECTIVES Tibolone (Tib) exhibits progestagenic activities in addition to its tissue-specific estrogenic activities. The purpose of the current study was to determine the progestagenic actions of Tib and its metabolites using target genes known to be regulated by progestins in human endometrial glandular and stromal cells. METHODS Human endometrial glandular and stromal cells were isolated from endometrial tissue fragments and separately incubated with Tib and its metabolites. Real-time polymerase chain reaction (PCR) was used to determine the mRNA content of 17betahydroxy steroid dehydrogenase (17betaHSD, type 2) and sulfotransferase (SULT1E1) in endometrial glandular cells, and prolactin (PRL) and insulin-like growth factor binding protein-1 (IGFBP1) in endometrial stromal cells. RESULTS In glandular cells, Tib and Delta4-tibolone (Delta4Tib) significantly increased the content of 17betaHSD and SULT1E1 mRNA. In stromal cells, Tib and Delta4Tib increased PRL mRNA ( approximately 30% of the capacity compared to progesterone) and had little effect on IGFBP1 mRNA. Anti-progestin, RU486, reversed the induction of SULT1E1 and PRL by progesterone or Tib. Also, the two 3 hydroxyl tobolone metabolites, especially 3betaOHTib, showed some progestagenic effects. CONCLUSIONS The data showed that Tib and Delta4Tib exhibited clear progestagenic effects in endometrial glandular cells by inducing 17betaHSD and SULT1E1, while in stromal cells the response was weaker in the induction of PRL and had little effect on IGFBP1. In addition, the 3betaOHTib metabolite expressed progestagenic activity. These disparate effects in two types of cells may be beneficial for maintaining endometrial cells in a quiescent state.
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Affiliation(s)
- Wei Zhang
- Department of Obstetrics/Gynecology and Reproductive Medicine, SUNY-Stony Brook, Stony Brook, New York 11794, USA
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Nasu K, Itoh H, Yuge A, Kawano Y, Narahara H. Insulin-like Growth Factor-I Regulates Vascular Endothelial Growth Factor Secretion by Human Oviductal Epithelial Cells and Stromal Fibroblasts. ACTA ACUST UNITED AC 2016; 13:368-71. [PMID: 16713312 DOI: 10.1016/j.jsgi.2006.03.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [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: 01/13/2006] [Indexed: 10/24/2022]
Abstract
OBJECTIVE The aim of the current study is to evaluate the effect of insulin-like growth factor-I (IGF-I) on the production of vascular endothelial growth factor (VEGF) in the human fallopian tube. METHODS Human oviductal epithelial cells (OEC) and oviductal stromal fibroblasts (OSF) were isolated from the ampullary segment of the fallopian tubes of six premenopausal patients in the proliferative phase of the menstrual cycle. The secretion of VEGF165 by cultured OEC and OSF in response to IGF-I was measured using an enzyme-linked immunosorbent assay (ELISA). RESULTS The secretion of VEGF165 was detected in cultured OEC and OSF under untreated conditions. The secretion of VEGF165 was significantly stimulated with IGF-I administration in these cells. CONCLUSION The present findings suggest that IGF-I in the local environment may stimulate oviductal vascular permeability by inducing the production of VEGF by oviductal cells through autocrine and paracrine mechanisms. The modulation of the VEGF production in the fallopian tube may contribute to the normal and pathologic processes of oviductal fluid secretion by regulating oviductal vascular permeability during the menstrual cycle and in the peri-implantation period.
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Affiliation(s)
- Kaei Nasu
- Department of Obstetrics and Gynecology, Faculty of Medicine, Oita University, Yufu-shi, Oita, Japan.
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12
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Malamitsi-Puchner A, Sarandakou A, Baka S, Vrachnis N, Kouskouni E, Hassiakos D. Soluble Fas Concentrations in the Follicular Fluid and Oocyte-Cumulus Complex Culture Medium From Women Undergoing In Vitro Fertilization: Association With Oocyte Maturity, Fertilization, and Embryo Quality. ACTA ACUST UNITED AC 2016; 11:566-9. [PMID: 15582503 DOI: 10.1016/j.jsgi.2004.05.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
OBJECTIVE Because soluble Fas (sFas) inhibits Fas-mediated apoptosis by preventing death signal transduction, we determined sFas concentrations in the follicular fluid (FF) and oocyte-cumulus complex culture medium (CM) from women undergoing in vitro fertilization (IVF) in order to associate its concentrations with oocyte maturity, fertilization, and embryo quality. METHODS We studied 82 follicles from 11 healthy women (mean age, 35.4 +/- 3.8 years) using a long protocol for IVF treatment. Individual FF and matched CM samples were immediately centrifuged at 4C and sFas concentrations were determined by sandwich enzyme-linked immunosorbent assays. RESULTS sFas concentrations were significantly higher in FF than in CM (P <.0001) and when oocytes were mature rather than immature (P <.002). Of 70 mature and 12 immature oocytes, 56 (80%) and two (16.6%), respectively, were fertilized. sFas concentrations in CM were significantly lower when mature oocytes were fertilized versus nonfertilized (P <.005). sFas concentrations in FF and CM were significantly related in an inverse manner to embryo quality (P = .004 and P = .0002, respectively). CONCLUSION FF and CM from women undergoing IVF contain sFas. The latter has anti-apoptotic properties and levels are higher: in FF when oocytes are mature and in CM when oocytes are nonfertilized. Furthermore, FF and CM sFas concentrations are negatively correlated with embryo quality.
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Liu T, Song HL, Zheng WP, Shen ZY. Inhibition of HBV Replication in HepG2.2.15 Cells by Human Peripheral Blood Mononuclear Cell-Derived Dendritic Cells. Ann Clin Lab Sci 2015; 45:495-501. [PMID: 26586699] [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] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Anti-HBV therapy is essential for patients awaiting liver transplantation. This study aimed to explore the effects of dendritic cells (DCs) derived from the peripheral blood of hepatitis B patients on the replication of HBV in vivo and to evaluate the biosafety of DCs in clinical therapy. Peripheral blood mononuclear cells (PBMCs) were isolated from HBV-infected patients and maturation-promoting factors and both HBsAg and HBcAg were used to induce DC maturation. Mature DCs and lymphocytes were co-cultured with human hepatocyte cell HL-7702 or HBV-producing human hepatocellular carcinoma cell HepG2.2.15. We found that mature lymphocytes exposed to DCs in vitro did not influence morphology or activities of HL-7702 and HepG2.2.15 cells. Liver function indexes and endotoxin levels in the cell supernatants did not change in these co-cultures. Additionally, supernatant and intracellular HBV DNA levels were reduced when HepG2.2.15 cells were co-cultured with mature lymphocytes that had been cultured with DCs, and HBV covalently closed circular DNA (cccDNA) levels in HepG2.2.15 cells also decreased. Importantly, DC-mediated immunotherapy had no mutagenic effect on HBV genomic DNA by gene sequencing of the P, S, X, and C regions of HBV genomic DNA. We conclude that PBMC-derived DCs from HBV-infected patients act on autologous lymphocytes to suppress HBV replication and these DC clusters showed favorable biosafety.
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Affiliation(s)
- Tao Liu
- Department of Organ Transplantation, Tianjin First Central Hospital, Tianjin, China
| | - Hong-Li Song
- Department of Organ Transplantation, Tianjin First Central Hospital, Tianjin, China
| | - Wei-Ping Zheng
- Department of Organ Transplantation, Tianjin First Central Hospital, Tianjin, China
| | - Zhong-Yang Shen
- Department of Organ Transplantation, Tianjin First Central Hospital, Tianjin, China
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Lenz G, Frohner M, Sauermann S, Forjan M. LUMOR: an app for standardized control and monitoring of a porcine lung and its nutrient cycle. Stud Health Technol Inform 2014; 198:79-86. [PMID: 24825688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The outcome of the EU-funded project ElBik has been the lung simulator 'iLung', which imitates an actively breathing human lung with a porcine lung. In order to keep the explanted lung in a nearly physiological state during transportation from the slaughterhouse to the ventilation laboratory the tissue needs to be nourished and temperature controlled. The Project AlveoPic designs a mobile transport vehicle implementing an ISO/IEEE 11073-20601 compliant communication interface for the exchange of the physical parameters, alert messages and setpoint-values. An appropriate 11073 domain information model is designed and limitations of the defined services and attributes are identified. For monitoring purposes the Android App LUMOR is implemented providing a user with an easy-to-handle GUI. It was found, that alert capabilities and remote set features are not well supported in ISO/IEEE 11073-20601 at the moment and possible workarounds are discussed.
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Affiliation(s)
- Gregor Lenz
- Department of Biomedical Engineering, University of Applied Sciences Technikum Wien, Austria
| | - Matthias Frohner
- Department of Biomedical Engineering, University of Applied Sciences Technikum Wien, Austria
| | - Stefan Sauermann
- Department of Biomedical Engineering, University of Applied Sciences Technikum Wien, Austria
| | - Mathias Forjan
- Department of Biomedical Engineering, University of Applied Sciences Technikum Wien, Austria
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Trefz P, Koehler H, Klepik K, Moebius P, Reinhold P, Schubert JK, Miekisch W. Volatile emissions from Mycobacterium avium subsp. paratuberculosis mirror bacterial growth and enable distinction of different strains. PLoS One 2013; 8:e76868. [PMID: 24116177 PMCID: PMC3792893 DOI: 10.1371/journal.pone.0076868] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [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: 05/23/2013] [Accepted: 08/28/2013] [Indexed: 01/03/2023] Open
Abstract
Control of paratuberculosis in livestock is hampered by the low sensitivity of established direct and indirect diagnostic methods. Like other bacteria, Mycobacterium avium subsp. paratuberculosis (MAP) emits volatile organic compounds (VOCs). Differences of VOC patterns in breath and feces of infected and not infected animals were described in first pilot experiments but detailed information on potential marker substances is missing. This study was intended to look for characteristic volatile substances in the headspace of cultures of different MAP strains and to find out how the emission of VOCs was affected by density of bacterial growth. One laboratory adapted and four field strains, three of MAP C-type and one MAP S-type were cultivated on Herrold’s egg yolk medium in dilutions of 10-0, 10-2, 10-4 and 10-6. Volatile substances were pre-concentrated from the headspace over the MAP cultures by means of Solid Phase Micro Extraction (SPME), thermally desorbed from the SPME fibers and separated and identified by means of GC-MS. Out of the large number of compounds found in the headspace over MAP cultures, 34 volatile marker substances could be identified as potential biomarkers for growth and metabolic activity. All five MAP strains could clearly be distinguished from blank culture media by means of emission patterns based on these 34 substances. In addition, patterns of volatiles emitted by the reference strain were significantly different from the field strains. Headspace concentrations of 2-ethylfuran, 2-methylfuran, 3-methylfuran, 2-pentylfuran, ethyl acetate, 1-methyl-1-H-pyrrole and dimethyldisulfide varied with density of bacterial growth. Analysis of VOCs emitted from mycobacterial cultures can be used to identify bacterial growth and, in addition, to differentiate between different bacterial strains. VOC emission patterns may be used to approximate bacterial growth density. In a perspective volatile marker substances could be used to diagnose MAP infections in animals and to identify different bacterial strains and origins.
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Affiliation(s)
- Phillip Trefz
- Department of Anaesthesia and Intensive Care, University of Rostock, Rostock, Germany
| | - Heike Koehler
- Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Jena, Germany
| | - Klaus Klepik
- Department of Anaesthesia and Intensive Care, University of Rostock, Rostock, Germany
| | - Petra Moebius
- Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Jena, Germany
| | - Petra Reinhold
- Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Jena, Germany
| | - Jochen K. Schubert
- Department of Anaesthesia and Intensive Care, University of Rostock, Rostock, Germany
| | - Wolfram Miekisch
- Department of Anaesthesia and Intensive Care, University of Rostock, Rostock, Germany
- * E-mail:
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Emri T, Tóth V, Nagy CT, Nagy G, Pócsi I, Gyémánt G, Antal K, Balla J, Balla G, Román G, Kovács I, Pócsi I. Towards high-siderophore-content foods: optimisation of coprogen production in submerged cultures of Penicillium nalgiovense. J Sci Food Agric 2013; 93:2221-2228. [PMID: 23349056 DOI: 10.1002/jsfa.6029] [Citation(s) in RCA: 12] [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] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Revised: 10/25/2012] [Accepted: 12/06/2012] [Indexed: 06/01/2023]
Abstract
BACKGROUND Fungal siderophores are likely to possess atheroprotective effects in humans, and therefore studies are needed to develop siderophore-rich food additives or functional foods to increase the siderophore uptake in people prone to cardiovascular diseases. In this study the siderophore contents of mould-ripened cheeses and meat products were analysed and the coprogen production by Penicillium nalgiovense was characterised. RESULTS High concentrations of hexadentate fungal siderophores were detected in penicillia-ripened Camembert- and Roquefort-type cheeses and also in some sausages. In one sausage fermented by P. nalgiovense, the siderophore content was comparable to those found in cheeses. Penicillium nalgiovense produced high concentrations of coprogen in submerged cultures, which were affected predominantly by the available carbon and nitrogen sources under iron starvation. Considerable coprogen yields were still detectable in the presence of iron when the fermentation medium was supplemented with the iron chelator Na₂-EDTA or when P. nalgiovense was co-cultivated with Saccharomyces cerevisiae. CONCLUSION These data may be exploitable in the future development of high-siderophore-content foods and/or food additives. Nevertheless, the use of P. nalgiovense fermentation broths for these purposes may be limited by the instability of coprogen in fermentation media and by the β-lactam production by the fungus.
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Affiliation(s)
- Tamás Emri
- Department of Microbial Biotechnology and Cell Biology, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
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Curtis S, Jones CJP, Garrod A, Hulme CH, Heazell AEP. Identification of autophagic vacuoles and regulators of autophagy in villous trophoblast from normal term pregnancies and in fetal growth restriction. J Matern Fetal Neonatal Med 2013; 26:339-46. [PMID: 23039021 DOI: 10.3109/14767058.2012.733764] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [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: 12/23/2022]
Abstract
Fetal growth restriction (FGR) is a serious pregnancy complication associated with increased perinatal mortality and morbidity. Although the majority of cases with FGR result from placental dysfunction, the pathophysiology is incompletely understood. Autophagy is a physiological form of cell degradation exacerbated by nutrient and oxygen restriction, which are both thought to play a role in the aetiology of FGR. We hypothesized that autophagy is present in the normal human placenta and is exaggerated in FGR. Autophagy was assessed in electron micrographs from normal and FGR placentas and by Western blotting for LC3B and LAMP-2. The localization of regulators of autophagy was examined by immunohistochemistry. Culture of BeWo cells was used to investigate whether nutrient and/or oxygen deprivation can induce autophagy in trophoblast. Autophagy predominantly localized to the syncytiotrophoblast layer and autophagosomes were more frequent in FGR. The regulators LAMP-2, LC3B, Beclin-1, ATG 5, ATG9 and ATG16L1 were all present in villous trophoblast. LAMP-2 immunostaining was more punctate in FGR. In BeWo cells, culture in reduced oxygen tension and/or serum depleted conditions led to the appearance of autophagosomes which was associated with changes in LAMP-2 configuration. We conclude that autophagy in human term placenta may be involved in the placental dysfunction present in FGR.
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Affiliation(s)
- Sophie Curtis
- Maternal and Fetal Health Research Centre, Institute of Human Development, University of Manchester, Manchester Academic Health Science Centre, Manchester, UK
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18
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Van Ly D, Faiz A, Jenkins C, Crossett B, Black JL, McParland B, Burgess JK, Oliver BGG. Characterising the mechanism of airway smooth muscle β2 adrenoceptor desensitization by rhinovirus infected bronchial epithelial cells. PLoS One 2013; 8:e56058. [PMID: 23457497 PMCID: PMC3574065 DOI: 10.1371/journal.pone.0056058] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2012] [Accepted: 01/04/2013] [Indexed: 11/19/2022] Open
Abstract
Rhinovirus (RV) infections account for approximately two thirds of all virus-induced asthma exacerbations and often result in an impaired response to β2 agonist therapy. Using an in vitro model of RV infection, we investigated the mechanisms underlying RV-induced β2 adrenoceptor desensitization in primary human airway smooth muscle cells (ASMC). RV infection of primary human bronchial epithelial cells (HBEC) for 24 hours produced conditioned medium that caused β2 adrenoceptor desensitization on ASMCs without an effect on ASMCs viability. Less than 3 kDa size fractionation together with trypsin digestion of RV-induced conditioned medium did not prevent β2 adrenoceptor desensitization, suggesting it could potentially be mediated by a small peptide or lipid. RV infection of BECs, ASMCs and fibroblasts produced prostaglandins, of which PGE2, PGF2α and PGI2 had the ability to cause β2 adrenoceptor desensitization on ASMCs. RV-induced conditioned medium from HBECs depleted of PGE2 did not prevent ASMC β2 adrenoceptor desensitization; however this medium induced PGE2 from ASMCs, suggesting that autocrine prostaglandin production may be responsible. Using inhibitors of cyclooxygenase and prostaglandin receptor antagonists, we found that β2 adrenoceptor desensitization was mediated through ASMC derived COX-2 induced prostaglandins. Since ASMC prostaglandin production is unlikely to be caused by RV-induced epithelial derived proteins or lipids we next investigated activation of toll-like receptors (TLR) by viral RNA. The combination of TLR agonists poly I:C and imiquimod induced PGE2 and β2 adrenoceptor desensitization on ASMC as did the RNA extracted from RV-induced conditioned medium. Viral RNA but not epithelial RNA caused β2 adrenoceptor desensitization confirming that viral RNA and not endogenous human RNA was responsible. It was deduced that the mechanism by which β2 adrenoceptor desensitization occurs was by pattern recognition receptor activation of COX-2 induced prostaglandins.
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Affiliation(s)
- David Van Ly
- Woolcock Institute of Medical Research, Sydney, Australia.
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Boero C, Olivo J, De Micheli G, Carrara S. New approaches for carbon nanotubes-based biosensors and their application to cell culture monitoring. IEEE Trans Biomed Circuits Syst 2012; 6:479-485. [PMID: 23853234 DOI: 10.1109/tbcas.2012.2220137] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Amperometric biosensors are complex systems and they require a combination of technologies for their development. The aim of the present work is to propose a new approach in order to develop nanostructured biosensors for the real-time detection of multiple metabolites in cell culture flasks. The fabrication of five Au working electrodes onto silicon substrate is achieved with CMOS compatible microtechnology. Each working electrode presents an area of 0.25 mm², so structuration with carbon nanotubes and specific functionalization are carried out by using spotting technology, originally developed for microarrays and DNA printing. The electrodes are characterized by cyclic voltammetry and compared with commercially available screen-printed electrodes. Measurements are carried out under flow conditions, so a simple fluidic system is developed to guarantee a continuous flow next to the electrodes. The working electrodes are functionalized with different enzymes and calibrated for the real-time detection of glucose, lactate, and glutamate. Finally, some tests are performed on surnatant conditioned medium sampled from neuroblastoma cells (NG-108 cell line) to detect glucose and lactate concentration after 72 hours of cultivation. The developed biosensor for real-time and online detection of multiple metabolites shows very promising results towards circuits and systems for cell culture monitoring.
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Affiliation(s)
- Cristina Boero
- Integrated Systems Laboratory, Ècole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
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Qian X, Li C, Pang B, Xue M, Wang J, Zhou J. Spondin-2 (SPON2), a more prostate-cancer-specific diagnostic biomarker. PLoS One 2012; 7:e37225. [PMID: 22615945 PMCID: PMC3352876 DOI: 10.1371/journal.pone.0037225] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2011] [Accepted: 04/15/2012] [Indexed: 01/08/2023] Open
Abstract
Background Prostate-specific antigen (PSA) screening, although common, has recently been called into question. To find prostate cancer (PCa) diagnostic biomarkers that can make up for the defects of PSA, we compared the secretomes of several benign and PCa cell lines, selected candidate molecules, and then confirmed their clinical value. Methodology/Principal Findings We first identified extracellular proteins by two-dimensional gel electrophoresis (2-DE) coupled with liquid chromatography-tandem mass spectrometry (LC-MS/MS) identification. We then validated the secreted proteins on a cellular level, and finally determined whether they could be used as PCa diagnostic biomarkers using prostate tissue and serum specimens of Chinese volunteers by immunohistostaining and sandwich ELISA. We obtained credible extracellular protein 2-DE graphs of prostate cell lines. The 5 spots that showed superior repeatability were selected for LC-MS/MS analysis, which identified seven candidate molecules. One of the candidate molecules, spondin-2 (SPON2), was only expressed in the conditioned media (CM) of androgen receptor (AR) positive PCa cell lines. Using tissue microarray by immunohistostaining, we found SPON2 to be over-expressed in PCa. SPON2 staining was more intense in Gleason score sum 7–8 and in PCa patients with metastasis. By receiver operator characteristic (ROC) curve analysis, we found that the serum SPON2 level was elevated in PCa patients, showing sensitivity and specificity suitable for diagnostic use. We also found that SPON2 could be used to identify PCa patients with serum PSA levels no higher than 10 ng/ml from healthy elderly men. Conclusion/Significance SPON2 is a new serum and histological diagnostic biomarker for PCa. It can avoid some of the problems of PSA testing and was here found to offer relatively high sensitivity and specificity relative to PSA.
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Affiliation(s)
- Xiaolong Qian
- Department of Medical Molecular Biology, Beijing Institute of Biotechnology, Beijing, P. R. China
- Department of Breast Pathology and Research, State Key Lab of Breast cancer Research, Cancer Hospital of Tianjin Medical University, Tianjin, P. R. China
| | - Changling Li
- Cancer Institute, Peking Union Medical College and Chinese Academy of Medical Science, Beijing, P. R. China
| | - Bo Pang
- Department of Medical Molecular Biology, Beijing Institute of Biotechnology, Beijing, P. R. China
| | - Meng Xue
- Department of Medical Molecular Biology, Beijing Institute of Biotechnology, Beijing, P. R. China
| | - Jian Wang
- Department of Medical Molecular Biology, Beijing Institute of Biotechnology, Beijing, P. R. China
- * E-mail: (JZ); (JW)
| | - Jianguang Zhou
- Department of Medical Molecular Biology, Beijing Institute of Biotechnology, Beijing, P. R. China
- * E-mail: (JZ); (JW)
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Pyrc K, Stożek K, Wojcik K, Gawron K, Zeglen S, Karolak W, Wojarski J, Ochman M, Hubalewska-Mazgaj M, Bochenek G, Sanak M, Zembala M, Szczeklik A, Potempa J. Use of sensitive, broad-spectrum molecular assays and human airway epithelium cultures for detection of respiratory pathogens. PLoS One 2012; 7:e32582. [PMID: 22403676 PMCID: PMC3293820 DOI: 10.1371/journal.pone.0032582] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [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: 11/09/2011] [Accepted: 01/27/2012] [Indexed: 11/18/2022] Open
Abstract
Rapid and accurate detection and identification of viruses causing respiratory tract infections is important for patient care and disease control. Despite the fact that several assays are available, identification of an etiological agent is not possible in ~30% of patients suffering from respiratory tract diseases. Therefore, the aim of the current study was to develop a diagnostic set for the detection of respiratory viruses with sensitivity as low as 1-10 copies per reaction. Evaluation of the assay using a training clinical sample set showed that viral nucleic acids were identified in ~76% of cases. To improve assay performance and facilitate the identification of novel species or emerging strains, cultures of fully differentiated human airway epithelium were used to pre-amplify infectious viruses. This additional step resulted in the detection of pathogens in all samples tested. Based on these results it can be hypothesized that the lack of an etiological agent in some clinical samples, both reported previously and observed in the present study, may result not only from the presence of unknown viral species, but also from imperfections in the detection methods used.
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Affiliation(s)
- Krzysztof Pyrc
- Microbiology Department, Faculty of Biochemistry Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland.
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Talbot NC, Sparks WO, Powell AM, Kahl S, Caperna TJ. Quantitative and semiquantitative immunoassay of growth factors and cytokines in the conditioned medium of STO and CF-1 mouse feeder cells. In Vitro Cell Dev Biol Anim 2011; 48:1-11. [PMID: 22179674 DOI: 10.1007/s11626-011-9467-7] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2011] [Accepted: 10/31/2011] [Indexed: 01/14/2023]
Abstract
Feeder cells of irradiated mouse fibroblasts are commonly used for, and are generally necessary for, the in vitro maintenance and growth of many fastidious cell types, particularly embryonic stem cells or induced pluripotent stem cells. Quantitative and semiquantitative immunoassays of conditioned media were performed to identify some of the soluble cytokines, chemokines, protein hormones, and cell matrix/adhesion molecules that are elaborated from two commonly used feeder cells, STO and CF-1. Among those quantitatively assayed, the most abundant cytokine proteins expressed by the feeder cells were activin A, hepatocyte growth factor (HGF), insulin-like growth factor 1, insulin-like growth factor 2, insulin-like growth factor binding protein (IGFBP)-6, macrophage colony-stimulating factor (a.k.a. CSF-1), and pigment epithelium-derived factor (a.k.a. serine protease inhibitor, clade F, member 1). CF-1 cells expressed ten times more activin A than STO cells and also produced larger amounts of interleukin-6 and IGFBP-2, IGFBP-3, IGFBP-4, and IGFBP-5. Conversely, STO cell produced almost ten times more HGF and five times more stem cell factor (a.k.a. c-kit ligand) than CF-1 cells. Assayed semiquantitatively, relatively large amounts of chemokines were produced by both feeder cells including fractalkine (CX3CL1), interferon-inducible protein 10 (a.k.a. CXCL10 and cytokine-responsive gene-2, CRG-2), monocyte chemotactic protein (MCP)-1 (a.k.a. CCL2 and junctional epithelium chemokine (JE), MCP-5/CCL12), keratinocyte-derived chemokine (a.k.a. CXCL1 and growth-related oncogene alpha, GROα), nephroblastoma overexpressed gene (CCN3, IGFBP-9), stromal cell-derived factor 1 (CXCL12), and serpin E1 (PAI-1). In contrast to one another, STO produced more CXCL16 than CF-1 cells, and CF-1 cell produced more MCP-5 (CCL12), macrophage inflammatory protein (MIP)-1α (CCL3), MIP-1β (CCL4), pentraxin-3 (TSG-14), and platelet factor-4 (CXCL4) than STO cells. Soluble adhesion molecule, sICAM (ICAM-1, CD54), was expressed by CF-1 cells, but not STO cells, and similarly, the cell matrix-associated molecules endocan (endothelial cell-specific molecule 1), endostatin (collagen XVIII), and matrix metalloproteinase 3 were expressed more by CF-1 cells. Tissue inhibitor of metalloproteinases 1 was robustly expressed by both feeder cells. Other proteins primarily detected from CF-1 cells included retinol-binding protein 4 and FGF21, while STO cells secreted more interferon gamma. Both feeder cells produced no or low amounts of LIF, tumor necrosis factor alpha, vascular endothelial growth factor (VEGF), VEGF-B, prolactin, various interleukins, fibroblast growth factor (FGF)-1, FGF-2, FGF-7, EGF, HB-EGF, and amphiregulin. The results may explain some of the cell growth and maintenance responses by various types of cells co-cultured on STO or CF-1 feeder cells.
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Affiliation(s)
- Neil C Talbot
- USDA, ARS, Animal and Natural Resources Institute, Animal Biosciences and Biotechnology Laboratory, Beltsville, MD 20705, USA.
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Makawita S, Smith C, Batruch I, Zheng Y, Rückert F, Grützmann R, Pilarsky C, Gallinger S, Diamandis EP. Integrated proteomic profiling of cell line conditioned media and pancreatic juice for the identification of pancreatic cancer biomarkers. Mol Cell Proteomics 2011; 10:M111.008599. [PMID: 21653254 PMCID: PMC3205865 DOI: 10.1074/mcp.m111.008599] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.7] [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: 02/12/2011] [Revised: 05/19/2011] [Indexed: 12/13/2022] Open
Abstract
Pancreatic cancer is one of the leading causes of cancer-related deaths, for which serological biomarkers are urgently needed. Most discovery-phase studies focus on the use of one biological source for analysis. The present study details the combined mining of pancreatic cancer-related cell line conditioned media and pancreatic juice for identification of putative diagnostic leads. Using strong cation exchange chromatography, followed by LC-MS/MS on an LTQ-Orbitrap mass spectrometer, we extensively characterized the proteomes of conditioned media from six pancreatic cancer cell lines (BxPc3, MIA-PaCa2, PANC1, CAPAN1, CFPAC1, and SU.86.86), the normal human pancreatic ductal epithelial cell line HPDE, and two pools of six pancreatic juice samples from ductal adenocarcinoma patients. All samples were analyzed in triplicate. Between 1261 and 2171 proteins were identified with two or more peptides in each of the cell lines, and an average of 521 proteins were identified in the pancreatic juice pools. In total, 3479 nonredundant proteins were identified with high confidence, of which ∼ 40% were extracellular or cell membrane-bound based on Genome Ontology classifications. Three strategies were employed for identification of candidate biomarkers: (1) examination of differential protein expression between the cancer and normal cell lines using label-free protein quantification, (2) integrative analysis, focusing on the overlap of proteins among the multiple biological fluids, and (3) tissue specificity analysis through mining of publically available databases. Preliminary verification of anterior gradient homolog 2, syncollin, olfactomedin-4, polymeric immunoglobulin receptor, and collagen alpha-1(VI) chain in plasma samples from pancreatic cancer patients and healthy controls using ELISA, showed a significant increase (p < 0.01) of these proteins in plasma from pancreatic cancer patients. The combination of these five proteins showed an improved area under the receiver operating characteristic curve to CA19.9 alone. Further validation of these proteins is warranted, as is the investigation of the remaining group of candidates.
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Affiliation(s)
- Shalini Makawita
- From the ‡Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
- §Department of Clinical Biochemistry, University Health Network, Toronto, ON, Canada
| | - Chris Smith
- §Department of Clinical Biochemistry, University Health Network, Toronto, ON, Canada
| | - Ihor Batruch
- ¶Department of Pathology and Laboratory Medicine, Mount Sinai Hospital, Toronto, ON, Canada
| | - Yingye Zheng
- ‖The Fred Hutchinson Cancer Research Center, Seattle, Washington
| | - Felix Rückert
- **Visceral, Thoracic and Vascular Surgery, University Hospital Carl Gustav Carus, Technical University of Dresden, Germany
| | - Robert Grützmann
- **Visceral, Thoracic and Vascular Surgery, University Hospital Carl Gustav Carus, Technical University of Dresden, Germany
| | - Christian Pilarsky
- **Visceral, Thoracic and Vascular Surgery, University Hospital Carl Gustav Carus, Technical University of Dresden, Germany
| | - Steven Gallinger
- ‡‡Zane Cohen Familial Gastrointestinal Cancer Registry and Department of Surgery, Mount Sinai Hospital, University of Toronto, Toronto, Ontario, Canada
| | - Eleftherios P. Diamandis
- From the ‡Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
- §Department of Clinical Biochemistry, University Health Network, Toronto, ON, Canada
- ¶Department of Pathology and Laboratory Medicine, Mount Sinai Hospital, Toronto, ON, Canada
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Bradlow HL, Sepkovic DW, Telang N, Tiwari R. Adipocyte-derived factor as a modulator of oxidative estrogen metabolism: implications for obesity and estrogen-dependent breast cancer. In Vivo 2011; 25:585-588. [PMID: 21709000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The role of body fat as a risk factor for breast cancer has been well established. A decrease in the urinary 2/16α-hydroxyestrone ratio has also been shown to be a risk marker for breast cancer. These two observations are connected by the fact that obese women have decreased levels of 2-hydroxyestrone. To test the hypothesis that fat depots secrete factors that inhibit 2-hydroxylation, the effect of substances released into the media from adipocytes incubated in Krebs-Ringer buffer, on estrogen metabolism by MCF-7 cells in minimum essential medium eagle (MEM) plus adipocyte-conditioned media (ACM) was studied. The 1:1 ACM-MEM culture system resulted in a substantial and highly significant decrease in 2-hydroxylation of estradiol. This inhibition was partially reversed by the addition of indole-3-carbinol, a potent inducer of 2-hydroxylation of estradiol. Centrifugal sizing showed that the active 2-hydroxylation inhibitor in the medium had a molecular weight of about 30 kDa. These results suggest a mechanism for the decrease in 2-hydroxylation of estradiol that is observed in obese women and the increase in 2-hydroxylation observed in women with depleted fat depots.
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25
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Bran G, Götte K, Riedel K, Hörmann K, Riedel F. IL-6 antisense-mediated growth inhibition in a head and neck squamous cell carcinoma cell line. In Vivo 2011; 25:579-584. [PMID: 21708999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The growth of tumor cells can be regulated by a variety of cytokines. To investigate the pathogenesis of head and neck cancer and explore a new therapeutic approach for the carcinoma, the role of interleukin-6 (IL-6) in the growth of a human head and neck squamous cell carcinoma (HNSCC) cell line was examined. Whether or not IL-6 is increased in HNSCC and whether or not IL-6 antisense oligonucleotide treatment could decrease proliferation and angiogenic activity of HNSCC cell lines, was determined. Established human HNSCC cell lines were screened for IL-6 expression at both mRNA and protein levels. By using a 15-mer antisense phosphorothioate oligonucleotide targeting a sequence in the second exon of the IL-6 gene, modulation of IL-6 and vascular endothelial growth factor (VEGF) expression was examined in UMSCC IIA in cell supernatants by capture enzyme-linked immunosorbent assay (ELISA), and in cell lysates by reverse transcriptase-polymerase chain reaction (RT-PCR). In addition, cell growth was determined by cell count. Endothelial cell migration was measured using a modified Boyden chamber. IL-6 was identified in the supernatant of the cell culture medium, indicating that these cells secreted IL-6, and the mRNAs of IL-6 were shown to be present in the cell lysates. IL-6 antisense oligonucleotide treatment resulted in a significant reduction of IL-6 protein expression compared to the sense control. The antisense oligonucleotides targeting IL-6 mRNA, also, inhibited cell growth and IL-6 production as well as VEGF expression. The addition of conditioned medium from IL-6 antisense-treated tumor cells resulted in decreased endothelial cell migration and tubule formation. Taken together, these findings indicate that endogenous IL-6 plays an important role in the growth of HNSCC and exerts its action by an autocrine growth mechanism, and that therapeutic trials with antisense oligonucleotides targeted to IL-6 mRNA may have some value for the treatment of HNSCC due to a decrease of neovascularization.
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Affiliation(s)
- Gregor Bran
- Department of Otolaryngology, Head and Neck Surgery, University Hospital of Mannheim, Theodor-Kutzer-Ufer 1-3, D-68167 Mannheim, Germany.
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Cho YE, Alcantara E, Kumaran S, Son KH, Sohn HY, Lee JH, Choi CS, Ha TY, Kwun IS. Red yeast rice stimulates osteoblast proliferation and increases alkaline phosphatase activity in MC3T3-E1 cells. Nutr Res 2010; 30:501-10. [PMID: 20797483 DOI: 10.1016/j.nutres.2010.06.011] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [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: 04/05/2010] [Revised: 06/05/2010] [Accepted: 06/17/2010] [Indexed: 02/07/2023]
Abstract
Red yeast (Monascus purpureus) is used as a traditional hypocholesterolemic dietary food component in Asia due to its bioactive component, lovastatin. Recently, new evidence suggesting that the statins in red yeast enhance bone formation has been reported, but more research is still needed in order to support these claims of osteogenic effects. Therefore, in this study, we hypothesized that red yeast rice (in which red yeast is fermented) can improve osteogenic function through osteoblast cell proliferation and differentiation. We studied the effect of methanol extract of red yeast rice powder (RYRP) on osteoblast proliferation and differentiation by measuring mitochondrial enzyme activity and bone marker alkaline phosphatase (ALP) activity, respectively. Osteoblast-like MC3T3-E1 cells were cultured in various concentrations of RYRP methanol extract (0.001-1 mg/mL) during the osteoblast differentiation period (1, 5, 10, and 15 days). As measured by 3-[4,5-dimethylthiazol-2-y]-2,5-diphenyltetrazolium bromide assay, RYRP extracts stimulated cell proliferation during a 24-hour period, compared to cooked white rice powder extract. The most pronounced effect was observed at the concentration range between 0.075 and 0.1 mg/mL. This RYRP stimulatory effect for cell proliferation was observed during the whole osteogenic period. Cellular (synthesized) ALP activity was increased at a RYRP extract concentration of 0.075 mg/mL during 15 days of culture, but the medium (secreted) ALP activity did not show any significant change. This cellular ALP activity stimulation by RYRP extract was confirmed by the staining of ALP activity on cell matrix layers for matrix calcification. The results imply that RYRP extract may increase osteogenic effect by stimulating cell proliferation and ALP activity in osteoblastic cells.
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Affiliation(s)
- Young-Eun Cho
- Department of Food Science and Nutrition, Andong National University, Andong, Kyungbook, Republic of Korea
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Mohammadi M, Day PJR. The influence of immunosuppressive drugs on vascular endothelial growth factor production in relation to VEGF -1154 g and -2578 C genotypes. Iran J Immunol 2010; 7:217-225. [PMID: 21189444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
BACKGROUND The pathogenesis of many diseases is correlated to irregularity in vascular endothelial growth factor (VEGF) expression. RESULTS from several association studies show that variation in the level of VEGF expression is related to polymorphic sequences within the VEGF gene. Additionally, there are many studies showing that some gene polymorphisms significantly influence the pharmacokinetics of immunosuppressive drugs. OBJECTIVE The aim of this study was to determine the influence of immunosuppressive drugs on VEGF production in individuals with different VEGF genotypes. METHODS ARMS-PCR was used to genotype VEGF polymorphisms at positions -1154 and -2578 within the promoter of VEGF gene. A VEGF-specific ELISA was used to determine the influence of immunosuppressive drugs on VEGF production in PBMCs of individuals with different VEGF genotypes. RESULTS Suppressive effect of mycophenolic acid was observed just in individuals with GG -1154/CC -2578, GG -1154/CA -2578 and GA -1154/CC -2578 haplotypes. Additionally, VEGF was significantly suppressed in all individuals after treatment with rapamycin except those who had AA -1154/CA -2578 and AA -1154/AA -2578 VEGF genotype combinations. CONCLUSION RESULTS of a recent study revealed that MMF treatment might be effective in preventing chronic renal rejection only in recipients with IL-10 high producer genotype. Additionally result of another study showed that CYP3A5 genotype markedly influences the pharmacokinetics of rapamycin in kidney transplant recipients. Therefore with regard to our results, different suppressive effect of mycophenolic acid and rapamycin on VEGF production might also be dependent on VEGF genotype.
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Affiliation(s)
- Mojgan Mohammadi
- Kerman Physiology Research Centre, Kerman University of Medical Sciences, Kerman, Iran.
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Connell P, Walshe T, Ferguson G, Gao W, O'Brien C, Cahill PA. Elevated Glucose Attenuates Agonist- and Flow-Stimulated Endothelial Nitric Oxide Synthase Activity in Microvascular Retinal Endothelial Cells. ACTA ACUST UNITED AC 2009; 14:17-24. [PMID: 17364893 DOI: 10.1080/10623320601177213] [Citation(s) in RCA: 16] [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] [Indexed: 10/23/2022]
Abstract
Impaired vasoactive release of opposing vasodilator and vasoconstrictor mediators due to endothelial dysfunction is integral to the pathogenesis of diabetic retinopathy. The aim of this study was to determine the effect of hyperglycemia on the expression of endothelial nitric oxide synthase (eNOS) and the release of nitric oxide (NO) in bovine microvascular retinal endothelial cells (BRECs) under both static (basal and acetylcholine stimulated) and flow (laminar shear stress [10 dynes/cm2 and pulsatile flow 0.3 to 23 dynes/cm2) conditions using a laminar shear apparatus and an in vitro perfused transcapillary culture system. The activity and expression of eNOS, measured by nitrate levels and immunoblot, respectively, were determined following exposure of BRECs to varying concentrations of glucose and mannitol (0 to 25 mM). Under static conditions the expression of eNOS decreased significantly following exposure to increasing concentrations of glucose when compared to osmotic mannitol controls and was accompanied by a significant dose-dependent decrease in nitrate levels in conditioned medium. The acetylcholine stimulated increase in NO release (2.0 +/- 0.3-fold) was significantly reduced by 55% +/- 5% and 65% +/- 4.5% following exposure to 16 and 25 mM glucose, respectively, when compared to osmotic controls. In parallel studies, glucose significantly inhibited both laminar shear stress and pulsatile flow-induced activity when compared to mannitol. We conclude that hyperglycemia impairs agonist- and flow-dependent release of NO in retinal microvascular endothelial cells and may thus contribute to the vascular endothelial dysfunction and impaired autoregulation of diabetic retinopathy.
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Affiliation(s)
- Paul Connell
- Vascular Health Research Centre, Faculty of Science and Health, Dublin City University, Dublin, Ireland
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29
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Dowlatabadi R, Weljie AM, Thorpe TA, Yeung EC, Vogel HJ. Metabolic footprinting study of white spruce somatic embryogenesis using NMR spectroscopy. Plant Physiol Biochem 2009; 47:343-50. [PMID: 19195904 DOI: 10.1016/j.plaphy.2008.12.023] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2008] [Revised: 11/23/2008] [Accepted: 12/28/2008] [Indexed: 05/21/2023]
Abstract
White spruce is an important commercial species for reforestation. The success in its propagation through somatic embryogenesis is well documented; however the physiological processes involved are poorly understood and remain unoptimized. The variable quality embryos generated in vitro from the same genotype suggest control at the protein and metabolite level. In order to probe metabolic changes, we have conducted a "metabolic footprinting" study, whereby culture media from growing cells was quantitatively analyzed to determine which metabolites were consumed and excreted. Such experiments are advantageous in that there is no need to quench cellular metabolism or extract intracellular metabolites through time-consuming protocols. In this paper we demonstrate the application of the footprinting assay to somatic embryo cells of white spruce (Picea glauca) using 1D (1)H NMR spectroscopy. We have surveyed embryogenesis metabolism in two types of media, maintenance (MN) and maturation (MT). MN medium does not result in shoot apical meristem (SAM) formation, while MT medium induces the necessary changes leading to fully developed somatic embryos. The two types of media were easily distinguished using metabolomics analysis, namely multivariate pattern recognition statistics (orthogonal partial least squares discriminatory analysis). From this analysis, we have identified numerous compounds involved with branched chain amino acid pathways such as valine and isoleucine. These results are explained on the basis of known metabolic pathways implicated in plant and animal developmental processes, and ultimately implicate altered CoA biosynthesis.
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Affiliation(s)
- Reza Dowlatabadi
- Metabolomics Research Centre, University of Calgary, Alberta, Canada
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Taveira M, Pereira DM, Sousa C, Ferreres F, Andrade PB, Martins A, Pereira JA, Valentão P. In vitro cultures of Brassica oleracea L. var. costata DC: potential plant bioreactor for antioxidant phenolic compounds. J Agric Food Chem 2009; 57:1247-1252. [PMID: 19192972 DOI: 10.1021/jf803496x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
In this work were studied the phenolic composition of in vitro material (shoots, calli, and roots) of Brassica oleracea var. costata and its antioxidant capacity. Samples were obtained in different culture medium, with distinct supplementations to verify their influence on those parameters. Phenolic determination was achieved by HPLC-DAD. Antioxidant activity was assessed against DPPH. In calli and roots no phenolic compound was identified. In shoots was verified the presence of 36 compounds, which included hydroxycinnamic acids, flavonoids (kaempferol and quercetin derivatives), and hydroxycinnamic acyl glycosides (with a predominance of synapoyl gentiobiosides). MS liquid medium supplemented with 2 mg/L benzylaminopurine (BAP) and 0.1 mg/L naphthaleneacetic acid (NAA) revealed to be the best in vitro condition to produce shoot material with highest phenolic compound contents and stronger antioxidant potential, thus with a possible increase of health benefits.
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Affiliation(s)
- Marcos Taveira
- REQUIMTE/Serviço de Farmacognosia, Faculdade de Farmácia, Universidade do Porto, R. Aníbal Cunha 164, 4050-047 Porto, Portugal
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Hu F, Lu R, Huang B, Li Z. [Analysis and isolation of radical scavengers from metabolites of Hirsutella sp]. Wei Sheng Wu Xue Bao 2008; 48:1035-1041. [PMID: 18956752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
OBJECTIVE During a screening for free radical scavengers from metabolites of entomogenous fungi, we fond a fermentation broth of the strain RCEF 0881 of Hirsutella sp. exhibited strong radical scavenging activity. To make clear of the constituents of the active compounds, and prepare some pure active compound for further structure identification we launched this study. METHODS We used organic solvent for active compounds extraction. DPPH-TLC and DPPH- Microplate assay were used for activity analysis. Components analysis was carried out on a HPLC-DAD-HRMS, and bioactive compound preparation on a preparative RP-HPLC. RESULTS Our extraction tests showed that ethylacetate was the best solvent for the bioactive constituents extracting. HPLC-DAD-HRMS-DPPH assay revealed that the molecular formular of the radical scavengers existed in the extract were possibly C7H6O4, C8H8O3 and C12H14N2O. From the chromatographic and Uv properties, and the MS fragments, and database consulting, the compounds could be deduced as dihydroxybenzoic acid, methyl-hydroxyl benzoic acid, and an alkaloid, however, the structures are still needed to be confirmed. The pick area of HPLC and MS showed that the compound C12H14N2O was the main component of the extract. It was isolated via activity directed fractionation. The activity of the prepared compound was confirmed with DPPH-TLC assay and its purity was confirmed with HPLC-DAD-HR-ESIMS. The occurance of the three active compounds in entomogenous fungi was revealed for the first time.
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Affiliation(s)
- Fenglin Hu
- Research Center on Entomogenous Fungi, Anhui Agricultural University, Hefei 20036, China.
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Abstract
A robust tandem HPLC method coupling size-exclusion (Shodex Asahipak GS-320HQ) and reversed phase (Vydac 218TP54) columns with ultraviolet detection was developed for quantitative determination of interferon-gamma (IFN-gamma) in Chinese hamster ovary cell culture supernatant. The 2D-HPLC system was linked up by a 6-port 2-position low hold-up volume switch valve. Compared to a commercial ELISA kit for IFN-gamma, the coupled column LC approach was able to detect and quantify soluble IFN-gamma, regardless of the glycoprotein's molecular/conformational variability and sample background. Each LC-LC analysis took 90 minutes inclusive of column regeneration. The relative standard deviation of measurements (n = 5) was less than 3%. The limit of detection (LOD) was determined to be 0.35 microg IFN-gamma.
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Affiliation(s)
- Lin-Tang Goh
- Bioprocessing Technology Institute, Centros, Singapore.
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Nareika A, Im YB, Game BA, Slate EH, Sanders JJ, London SD, Lopes-Virella MF, Huang Y. High glucose enhances lipopolysaccharide-stimulated CD14 expression in U937 mononuclear cells by increasing nuclear factor kappaB and AP-1 activities. J Endocrinol 2008; 196:45-55. [PMID: 18180316 DOI: 10.1677/joe-07-0145] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
We have demonstrated recently that high glucose augments lipopolysaccharide (LPS)-stimulated matrix metalloproteinase (MMP) and cytokine expression by U937 mononuclear cells and human monocyte-derived macrophages. Since CD14 is a receptor for LPS, one potential underlying mechanism is that high glucose enhances CD14 expression. In the present study, we determined the effect of high glucose on CD14 expression by U937 mononuclear cells. After being chronically exposed to normal or high glucose for 2 weeks or longer, cells were treated with LPS for 24 h. Real-time PCR showed that although high glucose by itself did not increase CD14 expression significantly, it augmented LPS-stimulated CD14 expression by 15-fold. Immunoassay showed a marked enhancement of both membrane-associated and soluble CD14 protein levels by high glucose. Further investigations using transcription factor activity assays and gel shift assays revealed that high glucose augmented LPS-stimulated CD14 expression by enhancing transcription factor nuclear factor kappaB (NFkappaB) and activator protein-1 (AP-1) activities. Finally, studies using anti-CD14 neutralizing antibody showed that CD14 expression is essential for the enhancement of LPS-stimulated MMP-1 expression by high glucose. Taken together, this study has demonstrated a robust augmentation by high glucose of LPS-stimulated CD14 expression through AP-1 and NFkappaB transcriptional activity enhancement, elucidating a new mechanism by which hyperglycemia boosts LPS-elicited gene expression involved in inflammation and tissue destruction.
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Affiliation(s)
- Alena Nareika
- Division of Endocrinology, Diabetes and Medical Genetics, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina 29401, USA
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Samanna V, Ma T, Mak TW, Rogers M, Chellaiah MA. Actin polymerization modulates CD44 surface expression, MMP-9 activation, and osteoclast function. J Cell Physiol 2007; 213:710-20. [PMID: 17508356 DOI: 10.1002/jcp.21137] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [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: 12/17/2022]
Abstract
CD44 and MMP-9 are implicated in cell migration. In the current study, we tested the hypothesis that actin polymerization is critical for CD44 surface expression and MMP-9 activity on the cell surface. To understand the underlying molecular mechanisms involved in CD44 surface expression and MMP-9 activity on the cell surface, osteoclasts were treated with bisphosphonate (BP) alendronate, cytochalasin D (Cyt D), and a broad-spectrum MMP inhibitor (GM6001). BP has been reported to block the mevalonate pathway, thereby preventing prenylation of small GTPase signaling required for actin cytoskeleton modulation. We show in this study that osteoclasts secrete CD44 and MMP-9 into the resorption bay during migration and bone resorption. Results indicate that actin polymerization is critical for CD44 surface expression and osteoclast function. In particular, the surface expression of CD44 and the membrane activity of MMP-9 are reduced in osteoclasts treated with alendronate and Cyt D despite the membrane levels of MMP-9 being unaffected. Although GM6001 blocked MMP-9 activity, osteoclast migration, and bone resorption, the surface levels of CD44 were unaffected. We suggest that the surface expression of CD44 requires actin polymerization. Disruption of podosome and actin ring structures by Cyt D and alendronate not only resulted in reduced localization of MMP-9 in these structures but also in osteoclast migration and bone resorption. These results suggest that inhibition of actin polymerization by alendronate and Cyt D is effective in blocking CD44/MMP-9 complex formation on the cell surface, secretion of active form of MMP-9, and osteoclast migration. CD44/MMP-9 complex formation may signify a unique motility-enhancing signal in osteoclast function.
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Affiliation(s)
- V Samanna
- Department of Biomedical Sciences, Dental School, University of Maryland, Baltimore, Maryland 21201, USA
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Li X, Gui S, Wang H. Effect of Kidney-replenishing herb on the indoleamine 2,3-dioxygenase of human syncytiotrophoblasts cultured in vitro and the balance of helper T-cell cytokines. Gynecol Endocrinol 2007; 23:653-61. [PMID: 17999277 DOI: 10.1080/09513590701665060] [Citation(s) in RCA: 5] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
Abstract
BACKGROUND There is complicated pathogeny involved in spontaneous abortion. At present, the focus of study is on the interface between mother and fetus, the trophoblasts. Indoleamine 2,3-dioxygenase (IDO) is the first and regulatory enzyme in the major route of l-tryptophan catabolism, which induces immunosuppression of T lymphocytes. In the present study we investigated the effect of Kidney-replenishing herb on the expression and activity of IDO in human syncytiotrophoblasts cultured in vitro and the balance of helper T cell (Th) cytokines. METHODS Syncytiotrophoblasts were cultured in vitro for 24, 48 or 72 h, with either control serum or serum made from Kidney-replenishing herb, without or with different concentrations of the IDO inhibitor 1-methyltryptophan (1-MT). Reverse transcription-polymerase chain reaction was applied to analyze the IDO mRNA transcription of syncytiotrophoblasts and Western blotting was applied to determine the expression of IDO protein in syncytiotrophoblasts. The concentration of interleukin-10 and interferon-gamma in co-culture medium of syncytiotrophoblasts and decidual T lymphocytes was determined by enzyme-linked immunosorbent assay. High-performance liquid chromatography was used to determine the concentration of kynurenine (Kyn) and tryptophan (Tyr) in the co-culture medium, and the ratio of Kyn/Try was used to assess IDO activity. RESULTS IDO mRNA and protein were detected in human syncytiotrophoblasts cultured in vitro. The IDO inhibitor 1-MT caused the balance of Th cytokines to depart from type 2; when IDO activity was inhibited, Kidney-replenishing herb improved the expression of IDO mRNA and protein, promoted IDO activity and caused the balance of Th cytokines depart from type 1. CONCLUSION Kidney-replenishing herb improves the expression of IDO mRNA and protein, promotes IDO activity to an appropriate value, resumes the balance of Th cytokines and regulates maternofetal tolerance.
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MESH Headings
- Animals
- Coculture Techniques
- Codonopsis
- Culture Media, Conditioned/analysis
- Cytokines/analysis
- Cytokines/metabolism
- Embryo Culture Techniques
- Enzyme Inhibitors/pharmacology
- Female
- Humans
- Indoleamine-Pyrrole 2,3,-Dioxygenase/antagonists & inhibitors
- Indoleamine-Pyrrole 2,3,-Dioxygenase/genetics
- Indoleamine-Pyrrole 2,3,-Dioxygenase/metabolism
- Interferon-gamma/analysis
- Interleukin-10/analysis
- Kynurenine/analysis
- Plants, Medicinal
- Pregnancy
- RNA, Messenger/analysis
- Rats
- Rats, Sprague-Dawley
- T-Lymphocytes, Helper-Inducer/metabolism
- Trophoblasts/enzymology
- Tryptophan/analogs & derivatives
- Tryptophan/analysis
- Tryptophan/pharmacology
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Affiliation(s)
- Xuelian Li
- The Hospital of Obstetrics & Gynecology, Fudan University, Shanghai, PR China.
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Mann GE, Scholey DV, Robinson RS. Identification of elevated concentrations of estradiol in bovine uterine endometrium. Domest Anim Endocrinol 2007; 33:437-41. [PMID: 17049801 DOI: 10.1016/j.domaniend.2006.08.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2006] [Revised: 06/09/2006] [Accepted: 08/29/2006] [Indexed: 11/15/2022]
Abstract
We have investigated the estradiol content of bovine endometrium and related this to circulating plasma estradiol content. In 9 heifers, mean+/-S.E.M. plasma estradiol concentration was 0.64+/-0.25 pg/ml while the mean+/-S.E.M. endometrial estradiol content was 43.0+/-14.7 pg/g tissue; there was a close relationship between plasma and tissue estradiol levels (R(2)=0.81; P<0.001). During culture of endometrial tissue there was a progressive transfer of estradiol from tissue to culture media but no change in total estradiol. Culture of endometrium from 4 heifers with 5 ng/ml testosterone for 72 h resulted in no increase in estradiol. Furthermore, immunohistochemistry revealed no aromatase protein in uterine endometrium. These results confirm high stored tissue concentrations of estradiol in bovine endometrium while providing no evidence for estradiol synthesis by this tissue. The mechanism(s) through which this sequestration of estradiol into uterine tissue occurs remains to be determined.
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Affiliation(s)
- G E Mann
- University of Nottingham, School of Biosciences, Division of Animal Physiology, Sutton Bonington Campus, Loughborough LE12 5RD, UK.
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37
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Bujak-Gizycka B, Madej J, Wołkow PP, Olszanecki R, Drabik L, Rutowski J, Korbut R. Measurement of angiotensin metabolites in organ bath and cell culture experiments by liquid chromatography - electrospray ionization - mass spectrometry (LC-ESI-MS). J Physiol Pharmacol 2007; 58:529-540. [PMID: 17928648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 04/11/2007] [Accepted: 07/13/2007] [Indexed: 05/25/2023]
Abstract
The metabolism of renin-angiotensin system (RAS) is more complicated than previously expected and understanding the biological phenomena regulated by variety of angiotensin metabolites requires their precise and possibly comprehensive quantitation. Physiological concentrations of angiotensins (Ang) in biological fluids are low, therefore their accurate measurements require very sensitive and specific analytical methods. In this study we developed an accurate and reproducible method of quantitation of angiotensin metabolites through coupling of liquid chromatography and electrospray ionization - mass spectrometry (LC-ESI-MS). With this method main angiotensin metabolites (Ang I, II, III, IV, 1-9, 1-7, 1-5) can be reliably measured in organ bath of rat tissues (aorta, renal artery, periaortal adipose tissue) and in medium of cultured endothelial cells (EA.hy926), exposed to Ang I for 15 minutes, in the absence or in the presence of angiotensin converting enzyme inhibitor, perindoprilat. Presented LC-ESI-MS method proved to be a quick and reliable solution to comprehensive analysis of angiotensin metabolism in biological samples.
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Affiliation(s)
- B Bujak-Gizycka
- Chair of Pharmacology, Jagiellonian University School of Medicine, Cracow, Poland
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38
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Tam CL, Hofbauer M, Towle CA. Requirement for protein kinase R in interleukin-1alpha-stimulated effects in cartilage. Biochem Pharmacol 2007; 74:1636-41. [PMID: 17850766 PMCID: PMC2346584 DOI: 10.1016/j.bcp.2007.08.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [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: 06/12/2007] [Revised: 07/27/2007] [Accepted: 08/02/2007] [Indexed: 01/22/2023]
Abstract
Interleukin-1 (IL-1) has pleiotropic effects in cartilage. The interferon-induced, double stranded RNA-activated protein kinase PKR that phosphorylates eukaryotic initiation factor 2 (eIF2) alpha has been implicated in cytokine effects in chondrocytes. A compound was recently identified that potently suppresses PKR autophosphorylation (IC50 approximately 200 etaM) and partially restores PKR-inhibited translation in a cell-free system with significant effect in the nanomolar range. The objectives of this study were to exploit this potent PKR inhibitor to assess whether PKR kinase activity is required for catabolic and proinflammatory effects of IL-1alpha in cartilage and to determine whether IL-1alpha causes an increase in eIF2alpha phosphorylation that is antagonized by the PKR inhibitor. Cartilage explants were incubated with the PKR inhibitor and IL-1alpha. Culture media were assessed for sulfated glycosaminoglycan as an indicator of proteoglycan degradation and for prostaglandin E(2). Cartilage extracts were analyzed by Western blot for cyclooxygenase-2 and phosphorylated signaling molecules. Nanomolar concentrations of the PKR inhibitor suppressed proteoglycan degradation and cyclooxygenase-2 accumulation in IL-1alpha-activated cartilage. The PKR inhibitor stimulated or inhibited PGE(2) production with a biphasic dose response relationship. IL-1alpha increased the phosphorylation of both PKR and eIF2alpha, and nanomolar concentrations of PKR inhibitor suppressed the IL-1alpha-induced changes in phosphorylation. The results strongly support PKR involvement in pathways activated by IL-1alpha in chondrocytes.
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Affiliation(s)
- Christine L. Tam
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Boston, MA
| | - Maria Hofbauer
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Boston, MA
| | - Christine A. Towle
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Boston, MA
- Department of Orthopaedic Surgery, Harvard Medical School, Boston, MA
- Corresponding author: Address correspondence to Christine A. Towle, PhD, GRJ 1108, Massachusetts General Hospital, 55 Fruit Street, Boston, MA 02114-2696 USA, phone: 1-(617) 724-3744; fax: 1-(617) 724-7396;
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Hahn H, Huck CW, Rainer M, Najam-ul-Haq M, Bakry R, Abberger T, Jennings P, Pfaller W, Bonn GK. Analysis of glutathione in supernatants and lysates of a human proximal tubular cell line from perfusion culture upon intoxication with cadmium chloride by HPLC and LC-ESI-MS. Anal Bioanal Chem 2007; 388:1763-9. [PMID: 17594082 DOI: 10.1007/s00216-007-1401-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2006] [Revised: 05/21/2007] [Accepted: 05/24/2007] [Indexed: 11/29/2022]
Abstract
A simple and highly effective reversed-phase (RP) high-performance liquid chromatography (HPLC) method is described for analysing glutathione (GSH) and glutathione disulfide (GSSG) in out-flowing supernatants and lysates of perfusion cell cultures of human kidney cells (HK-2 cells) continuously exposed to cadmium chloride (CdCl2), which is a well-known nephrotoxin. The developed linear liquid chromatographic gradient employs monolithic poly(styrene-co-divinylbenzene) (PS/DVB) as a stationary phase and is adaptable for coupling to mass spectrometry via an electrospray ionisation interface (LC-ESI/MS), which is carried out in case of co-eluting peaks. This study presents a quantitative assay of glutathione over the time of experiment and cell lysates at the end of the experiment. The assay of out-flowing supernatants has the potential to be applied as an online assay in high time resolution. Glutathione (reduced and oxidised, GSH and GSSG) is chosen as an indicator for toxic effects in the cultured cells. In principle it is possible to show the concentration of glutathione as a function of time in an investigation of exposure of the HK-2 cell line to CdCl2. In addition to glutathione analysis, well-established assays of cell death such as enzyme release and cell viability are performed to obtain information about the number of living cells. Toxicity of 5 microM CdCl2 is manifested in all of the assays applied. Fast (<7 min) and highly reproducible (max. aberration 4.7%) determination of glutathione could be achieved.
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Affiliation(s)
- Hans Hahn
- Institute of Analytical Chemistry and Radiochemistry, Leopold-Franzens University, Innrain 52a, 6020, Innsbruck, Austria
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Grad S, Gogolewski S, Alini M, Wimmer MA. Effects of simple and complex motion patterns on gene expression of chondrocytes seeded in 3D scaffolds. ACTA ACUST UNITED AC 2007; 12:3171-9. [PMID: 17518631 DOI: 10.1089/ten.2006.12.3171] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.9] [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: 11/13/2022]
Abstract
This study investigated the effect of unidirectional and multidirectional motion patterns on gene expression and molecule release of chondrocyte-seeded 3D scaffolds. Resorbable porous polyurethane scaffolds were seeded with bovine articular chondrocytes and exposed to dynamic compression, applied with a ceramic hip ball, alone (group 1), with superimposed rotation of the scaffold around its cylindrical axis (group 2), oscillation of the ball over the scaffold surface (group 3), or oscillation of ball and scaffold in phase difference (group 4). Compared with group 1, the proteoglycan 4 (PRG4) and cartilage oligomeric matrix protein (COMP) mRNA expression levels were markedly increased by ball oscillation (groups 3 and 4). Furthermore, the collagen type II mRNA expression was enhanced in the groups 3 and 4, while the aggrecan and tissue inhibitor of metalloproteinase-3 (TIMP-3) mRNA expression levels were upregulated by multidirectional articular motion (group 4). Ball oscillation (groups 3 and 4) also increased the release of PRG4, COMP, and hyaluronan (HA) into the culture media. This indicates that the applied stimuli can contribute to the maintenance of the chondrocytic phenotype of the cells. The mechanical effects causing cell stimulation by applied surface motion might be related to fluid film buildup and/or frictional shear at the scaffold-ball interface. It is suggested that the oscillating ball drags the fluid into the joint space, thereby causing biophysical effects similar to those of fluid flow.
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Affiliation(s)
- Sibylle Grad
- AO Research Institute, Davos Platz, Switzerland.
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de Castellarnau C, Bancells C, Benítez S, Reina M, Ordóñez-Llanos J, Sánchez-Quesada JL. Atherogenic and inflammatory profile of human arterial endothelial cells (HUAEC) in response to LDL subfractions. Clin Chim Acta 2007; 376:233-6. [PMID: 16956600 DOI: 10.1016/j.cca.2006.07.024] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [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: 07/07/2006] [Revised: 07/25/2006] [Accepted: 07/25/2006] [Indexed: 11/17/2022]
Abstract
BACKGROUND Electronegative LDL (LDL(-)) is a minor modified LDL fraction present in plasma that has been demonstrated to be inflammatory in endothelial cells isolated from human umbilical vein (HUVEC). METHODS A protein array able to measure 42 cytokines, chemokines and related compounds involved in atherogenesis was used to determine their release into the culture medium of human arterial endothelial cells (HUAEC) activated or not by two low-density lipoprotein (LDL) fractions isolated from human plasma by anion-exchange chromatography. RESULTS The results of the protein array (confirmed using specific ELISAs for each induced factor) revealed that HUAEC in the absence of stimuli released small amounts of interleukin 8 (IL-8), monocyte chemotactic protein 1 (MCP-1) and growth-related oncogene (GRO). The major native LDL fraction (named LDL(+)) increased the release of these molecules and also those of interleukin 6 (IL-6) and GROalpha. Compared to LDL(+), the minor modified fraction, named electronegative LDL (LDL(-)), increased all these factors to a greater degree and also induced the release of granulocyte-monocyte colony-stimulating factor (GM-CSF) and platelet-derived growth factor B (PDGF-B). These results were confirmed by ELISA. CONCLUSIONS All these results indicate that, compared to LDL(+), LDL(-) fraction promotes not only the release of proinflammatory factors but also those of atherogenic factors in endothelial cells of arterial origin, thereby suggesting a new role for LDL(-) in atherogenesis.
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Affiliation(s)
- Conxita de Castellarnau
- Department of Cell Biology, Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain; Advancell S.L. Barcelona Science Park, Barcelona, Spain
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Abstract
Bovine alpha-lactalbumin (alpha-LA), a major milk protein, exerts strong gastroprotective activity against rat experimental gastric ulcers induced by ethanol or stress. To elucidate the mechanisms underlying this activity, the influence of alpha-LA on gastric mucus metabolism was investigated in vitro and in vivo. For the in vitro study, RGM1 cells (a rat gastric epithelial cell line) were selected for observation of the direct activity of alpha-LA on gastric mucosal cells and cultured in the presence of either alpha-LA or ovalbumin (OVA), a reference protein showing no gastroprotective activity. Amounts of synthesized and secreted mucin, a major component of mucus, were determined using [3H]glucosamine as a tracer, and prostaglandin E2 (PGE2) levels in the culture medium were determined by RIA. For the in vivo study, the thickness of the mucus gel layer, a protective barrier for gastric mucosa, was evaluated histochemically in rat gastric mucosa. alpha-Lactalbumin (3 mg/mL) significantly stimulated mucin synthesis and secretion in RGM1 cells and also increased PGE2 levels in the culture medium. In contrast, OVA showed no enhancing effects under identical conditions. Neither indomethacin, a cyclo-oxygenase inhibitor, nor AH23848, a prostaglandin EP4 receptor antagonist, affected alpha-LA-induced enhancement of mucin synthesis and secretion. In vivo, oral administration of alpha-LA (300 mg/kg x 3 times/d x 7 d) increased the thickness of the mucus gel layer in rats. These results indicate that alpha-LA fortifies the mucus gel layer by stimulating mucin production and secretion in gastric mucus-producing cells, and that this enhancing effect is independent of endogenous PGE2. Comparison of the efficacy of alpha-LA with OVA suggests that the activities observed in RGM1 cells are closely related to the gastroprotective effects in rat gastric ulcer models. In conclusion, alpha-LA stimulates mucus metabolism, and this action may be responsible for its gastroprotective activity.
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Affiliation(s)
- Y Ushida
- Biochemical Research Laboratory, Morinaga Milk Industry Co. Ltd., Zama, Kanagawa 228-8583, Japan.
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Xu B, Makris A, Thornton C, Ogle R, Horvath JS, Hennessy A. Antihypertensive drugs clonidine, diazoxide, hydralazine and furosemide regulate the production of cytokines by placentas and peripheral blood mononuclear cells in normal pregnancy. J Hypertens 2006; 24:915-22. [PMID: 16612254 DOI: 10.1097/01.hjh.0000222762.84605.03] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [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: 01/25/2023]
Abstract
BACKGROUND Antihypertensive drugs such as clonidine, diazoxide, hydralazine and furosemide are used in the hypertensive disorders of pregnancy to control blood pressure, but it is not clear if they modulate the production of placental or circulating cytokines. OBJECTIVE To examine the effect of pharmaceutical doses of well known antihypertensive drugs used for blood pressure control on the production of the cytokines interleukin (IL)-6, IL-10 and tumour necrosis factor (TNF)-alpha in placental tissue and peripheral blood mononuclear cells (PBMCs) in normal pregnancy. DESIGN Placental biopsies were taken from the decidual surface of placentas after delivery of normal pregnancies (n = 6) and PBMCs were separated from the whole blood of normal term pregnant women (n = 7). Both villous explants and PBMCs were cultured with increasing concentrations of antihypertensive drugs. The dose effect of drugs on the production of placental and circulating cytokines (IL-6, IL-10 and TNF-alpha) were examined by enzyme-linked immunosorbent assay. RESULTS Placental production of IL-10 was not affected by clonidine, but decreased significantly after incubation of the tissue with diazoxide, hydralazine or furosemide. Production of IL-10 by PBMCs increased significantly: by from 3.4 +/- 2.7% [16.3 pg/ml (range 6.1-21.5 pg/ml)] to 24.5 +/- 3.3% [30.4 pg/ml (range 16.9-34.8 pg/ml)] with increasing concentrations of clonidine (0.08-1.3 microg/ml), and by 8.8 +/- 3.5% [4.1 pg/ml (range 3.0-17.8 pg/ml)] and 17.2 +/- 1.9% [22.6 pg/ml (range 13.2-23.2 pg/ml)] with lower doses of hydralazine (6.3 and 12.5 microg/ml) (all P values < 0.05). There was a stepwise reduction in production of TNF-alpha and IL-6 with increasing doses of diazoxide, hydralazine and furosemide by placentas and PBMCs from these women with normal pregnancies. CONCLUSION Our data suggest that the antihypertensive drugs clonidine and hydralazine can stimulate production of the circulating anti-inflammatory cytokine IL-10, whereas furosemide and diazoxide inhibit the production of this cytokine and the proinflammatory cytokines TNF-alpha and IL-6 by placentas and PBMCs.
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Affiliation(s)
- Bei Xu
- Vascular Immunology Research Laboratory, The Heart Research Institute, University of Sydney, Australia.
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Cormier JT, zur Nieden NI, Rancourt DE, Kallos MS. Expansion of Undifferentiated Murine Embryonic Stem Cells as Aggregates in Suspension Culture Bioreactors. ACTA ACUST UNITED AC 2006; 12:3233-45. [PMID: 17518637 DOI: 10.1089/ten.2006.12.3233] [Citation(s) in RCA: 135] [Impact Index Per Article: 7.5] [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: 11/12/2022]
Abstract
Pluripotent embryonic stem cells (ESCs) have recently been considered as a primary material for regenerating tissues lost to injuries and degenerative diseases. For clinical implementation of this technology, a quality controlled, reproducible culture system is necessary for the expansion and differentiation of the cells. Used in many bioprocess applications, suspension bioreactors have gained considerable attention for the regulated large-scale expansion of cells. The current study presents a bioreactor process for the large-scale expansion of undifferentiated murine ESCs as aggregates. In this system, the level of ESC aggregation and differentiation was effectively controlled by adjusting shear forces and inoculation density, achieving a 31-fold expansion in 5 days. Pluripotency markers Oct-4, Nanog, SSEA-1, ALP, and rex-1 were assessed using flow cytometry analysis and gene expression profiles and showed that the undifferentiated nature of the cells within the ESC aggregates was maintained. Colony-forming efficiencies and embryoid body formation tests of the expanded cultures demonstrated that characteristic functional attributes of undifferentiated cells were not lost. Overcoming a major impediment in the area of ESC expansion, this study describes a successful process for the controlled and reproducible largescale expansion of ESCs using suspension culture bioreactors.
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Affiliation(s)
- Jaymi T Cormier
- Pharmaceutical Production Research Facility, Schulich School of Engineering, University of Calgary, Calgary, Alberta, Canada
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45
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Lamounier-Zepter V, Ehrhart-Bornstein M, Karczewski P, Haase H, Bornstein SR, Morano I. Human adipocytes attenuate cardiomyocyte contraction: characterization of an adipocyte-derived negative inotropic activity. FASEB J 2006; 20:1653-9. [PMID: 16873888 DOI: 10.1096/fj.05-5436com] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [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: 01/08/2023]
Abstract
The causal relationship between obesity and heart failure is broadly acknowledged; however, the pathophysiological mechanisms involved remain unclear. In this study we investigated whether human adipocytes secrete cardioactive substances that may affect cardiomyocyte contractility. We cultivated adipocytes obtained from human white adipose tissue and incubated isolated rat adult cardiomyocytes with adipocyte-conditioned or control medium. This is the first report to demonstrate that human adipocytes exhibit cardiodepressant activity with a direct and acute effect on cardiomyocyte contraction. This adipocyte-derived negative inotropic activity directly depresses shortening amplitude as well as intracellular systolic peak Ca2+ in cardiomyocytes within a few minutes. The adipocyte-derived cardiodepressant activity was dose-dependent and was completely blunted by heating or by trypsin digestion. Filtration of adipocyte-conditioned medium based on molecular mass characterized the cardiodepressant activity at between 10 and 30 kDa. In summary, adipose tissue exerts highly potent activity with an acute depressant effect directly on cardiomyocytes, which may well contribute to increased heart failure risk in overweight patients.
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Armaforte E, Carri S, Ferri G, Caboni MF. High-performance liquid chromatography determination of phenyllactic acid in MRS broth. J Chromatogr A 2006; 1131:281-4. [PMID: 16963056 DOI: 10.1016/j.chroma.2006.07.095] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2006] [Revised: 07/11/2006] [Accepted: 07/25/2006] [Indexed: 11/24/2022]
Abstract
Phenyllactic acid (PLA) is an organic acid produced by some strains of lactic acid bacteria (LAB) and concentrations higher than 7.5 mg/ml inhibit growth of moulds and yeasts. Since PLA can be used to select LAB, a rapid, simple and cheap method for its determination is desirable. Typical methods for its analysis in broth are time-consuming, analytically complicated, and have poor recoveries. Herein we propose a simple and rapid method that does not require extraction, but only microfiltration of broth before injection in HPLC. The improved chromatographic conditions allow separation and quantification of PLA with a recovery of 98.7%. The method is highly reproducible with an intraday repeatability of the total peak area of 2.00%, while an interday repeatability of 2.69%.
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Affiliation(s)
- Emanuele Armaforte
- Dipartimento di Protezione e Valorizzazione Agroalimentare, DIPROVAL, Università di Bologna, Via Fratelli Rosselli, 42100 Reggio Emilia, RE, Italy
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An HJ, Miyamoto S, Lancaster KS, Kirmiz C, Li B, Lam KS, Leiserowitz GS, Lebrilla CB. Profiling of glycans in serum for the discovery of potential biomarkers for ovarian cancer. J Proteome Res 2006; 5:1626-35. [PMID: 16823970 DOI: 10.1021/pr060010k] [Citation(s) in RCA: 175] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A glycomic approach is developed to identify oligosaccharide markers for ovarian cancer by rapidly profiling globally released oligosaccharides. Glycoproteins shed by cancer cells are found in the supernatant (or conditioned media) of cultured cells. In this approach, shed glycoproteins are profiled for their oligosaccharide content using beta-elimination conditions. Changes in glycosylation are monitored by matrix-assisted laser desorption/ionization Fourier transform ion cyclotron resonance mass spectrometry (MALDI-FTICR-MS). Because shed glycoproteins would also be found in serum, similar glycan profiling was performed to observe potential oligosaccharide markers. Oligosaccharide profiling data on a limited set of patient and normal serum samples were studied to determine potential glycan markers in ovarian cancer. We were able to demonstrate the presence of at least 15 unique serum glycan markers in all patients but absent in normal individuals. To determine the structure of the glycan biomarkers, a number of the ions were isolated and further analyzed using infrared multiphoton dissociation (IRMPD). One major advantage of this approach is that glycans are examined directly from patient sera without the need to obtain cancer biopsy specimens or to purify glycosylated proteins from these specimens.
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Affiliation(s)
- Hyun Joo An
- Department of Chemistry, University of California-Davis Cancer Center, California 95616, USA
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48
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Tzanakakis GN, Syrokou A, Kanakis I, Karamanos NK. Determination and distribution of N-acetyl- and N-glycolylneuraminic acids in culture media and cell-associated glycoconjugates from human malignant mesothelioma and adenocarcinoma cells. Biomed Chromatogr 2006; 20:434-9. [PMID: 16177958 DOI: 10.1002/bmc.573] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [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: 11/07/2022]
Abstract
Sialic acids containing glycoconjugates are very common in human neoplasias and their expression frequently correlates with malignant phenotype and the tumor grade. The majority of tumor markers containing sialic acids in man involve changes in the amount of total sialic acids and in the presence of the two main sialic acid types, Neu5Ac and Neu5Gc, and their derivatives. The aim of the present study was to examine whether malignant mesothelioma cell lines synthesize sialic acid containing glycoconjugates at both the extracellular and cell membrane levels and particularly whether the type and the content of Neu5Ac and Neu5Gc are of biological importance for mesothelioma cell differentiation and evaluation of its prognosis. The study was performed in three human malignant mesothelioma cell lines, two with a fibroblast like phenotype (STAV-FCS and Vester) and one of epithelial differentiation (STAV-AB), which developed from the pleural effusions of patients with malignant mesothelioma and in one human adenocarcinoma cell line (Wart). Neu5Ac and Neu5Gc were determined following a mild hydrolysis step and a sample clean-up procedure. The determination was performed by reversed-phase HPLC after the NeuAc and NeuGc had been converted to per-O-benzoylated derivatives. It was found that Neu5Gc is the major sialic acid in the culture media of all cell lines examined. Molar ratios of Neu5Ac to Neu5Gc showed that Neu5Gc is the predominant sialic acid in the culture medium of the fibroblast-like mesothelioma cells. Neu5Ac is almost undetectable in the cell membrane, whereas Neu5Gc is present in considerable amounts. The obtained results suggest that the type and the content of Neu5Ac and Neu5Gc in culture media are of biological importance for mesothelioma cell differentiation and may be of value in the evaluation of prognosis.
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Affiliation(s)
- G N Tzanakakis
- Department of Histology and Anatomy, School of Medicine, University of Crete, 71110 Heraklion, Greece.
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49
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Dews M, Homayouni A, Yu D, Murphy D, Sevignani C, Wentzel E, Furth EE, Lee WM, Enders GH, Mendell JT, Thomas-Tikhonenko A. Augmentation of tumor angiogenesis by a Myc-activated microRNA cluster. Nat Genet 2006; 38:1060-5. [PMID: 16878133 PMCID: PMC2669546 DOI: 10.1038/ng1855] [Citation(s) in RCA: 858] [Impact Index Per Article: 47.7] [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: 01/09/2006] [Accepted: 06/29/2006] [Indexed: 12/18/2022]
Abstract
Human adenocarcinomas commonly harbor mutations in the KRAS and MYC proto-oncogenes and the TP53 tumor suppressor gene. All three genetic lesions are potentially pro-angiogenic, as they sustain production of vascular endothelial growth factor (VEGF). Yet Kras-transformed mouse colonocytes lacking p53 formed indolent, poorly vascularized tumors, whereas additional transduction with a Myc-encoding retrovirus promoted vigorous vascularization and growth. In addition, VEGF levels were unaffected by Myc, but enhanced neovascularization correlated with downregulation of anti-angiogenic thrombospondin-1 (Tsp1) and related proteins, such as connective tissue growth factor (CTGF). Both Tsp1 and CTGF are predicted targets for repression by the miR-17-92 microRNA cluster, which was upregulated in colonocytes coexpressing K-Ras and c-Myc. Indeed, miR-17-92 knockdown with antisense 2'-O-methyl oligoribonucleotides partly restored Tsp1 and CTGF expression; in addition, transduction of Ras-only cells with a miR-17-92-encoding retrovirus reduced Tsp1 and CTGF levels. Notably, miR-17-92-transduced cells formed larger, better-perfused tumors. These findings establish a role for microRNAs in non-cell-autonomous Myc-induced tumor phenotypes.
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MESH Headings
- Animals
- Cell Line
- Cell Line, Transformed
- Cell Transformation, Viral
- Cells, Cultured
- Connective Tissue Growth Factor
- Culture Media, Conditioned/analysis
- Gene Expression Regulation, Neoplastic
- Genetic Vectors
- Humans
- Immediate-Early Proteins/genetics
- Immediate-Early Proteins/metabolism
- In Vitro Techniques
- Intercellular Signaling Peptides and Proteins/genetics
- Intercellular Signaling Peptides and Proteins/metabolism
- Mice
- Mice, Inbred C57BL
- MicroRNAs/metabolism
- Neoplasms/blood supply
- Neoplasms/pathology
- Neovascularization, Pathologic/genetics
- Neovascularization, Pathologic/metabolism
- Oligonucleotides, Antisense/pharmacology
- Proto-Oncogene Proteins c-myc/genetics
- Proto-Oncogene Proteins c-myc/physiology
- RNA, Neoplasm/metabolism
- Retroviridae/genetics
- Stem Cells/cytology
- Thrombospondin 1/genetics
- Thrombospondin 1/metabolism
- Transplantation, Homologous
- Vascular Endothelial Growth Factor A/analysis
- Vascular Endothelial Growth Factor A/metabolism
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Affiliation(s)
- Michael Dews
- Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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Karl W, Schneider J, Wetzstein HG. Outlines of an “exploding” network of metabolites generated from the fluoroquinolone enrofloxacin by the brown rot fungus Gloeophyllum striatum. Appl Microbiol Biotechnol 2006; 71:101-13. [PMID: 16249878 DOI: 10.1007/s00253-005-0177-5] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [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: 05/27/2005] [Revised: 08/08/2005] [Accepted: 09/02/2005] [Indexed: 10/25/2022]
Abstract
Degradation of the veterinary fluoroquinolone antibiotic enrofloxacin (EFL) was studied with three strains of Gloeophyllum, basidiomycetous fungi thought to produce extracellular hydroxyl radicals. Metabolites generated in a mineral medium were analyzed by combined high-performance liquid chromatography/high-resolution electrospray ionization mass spectrometry. Their origin was inferred from peak doublets representing 12C and 14C isotopomers detected at a defined proportion. From each exact molecular mass, the molecular formula was derived for which the most probable chemical structure was postulated, using for guidance 18 known EFL metabolites. All supernatants provided similar metabolite patterns, with the most comprehensive consisting of 87 compounds. These metabolites belonged to five families headed by EFL, its oxidatively decarboxylated or defluorinated congeners, an isatin-, and an anthranilic acid-type derivative. Metabolites hydroxylated in the aromatic part suggested the formation of three catechols and two oxidizable ortho-aminophenol-type compounds. After oxidation to the respective ortho-quinones or ortho-quinone imines and oxidative ring cleavage at one of three alternative sites, the formation of various cis,cis-muconic acid-type derivatives is likely, one of which could be detected. Anthranilic acid-type compounds provided two additional sites for ortho-aminophenol formation and aromatic ring cleavage. An "exploding" network of diverse EFL congeners produced by Gloeophyllum suggests the broad utility of our model for studying biodegradation.
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Affiliation(s)
- W Karl
- Bayer Industry Services GmbH & Co. OHG, 51368, Leverkusen, Germany
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