1
|
Hunziker S, Nazarova T, Kather M, Hartmann M, Brunner I, Schaub M, Rigling A, Hug C, Schönbeck L, Bose AK, Kammerer B, Gessler A. The metabolic fingerprint of Scots pine-root and needle metabolites show different patterns in dying trees. Tree Physiol 2024; 44:tpae036. [PMID: 38526975 PMCID: PMC11056600 DOI: 10.1093/treephys/tpae036] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2024] [Accepted: 03/19/2024] [Indexed: 03/27/2024]
Abstract
The loss of leaves and needles in tree crowns and tree mortality are increasing worldwide, mostly as a result of more frequent and severe drought stress. Scots pine (Pinus sylvestris L.) is a tree species that is strongly affected by these developments in many regions of Europe and Asia. So far, changes in metabolic pathways and metabolite profiles in needles and roots on the trajectory toward mortality are unknown, although they could contribute to a better understanding of the mortality mechanisms. Therefore, we linked long-term observations of canopy defoliation and tree mortality with the characterization of the primary metabolite profile in needles and fine roots of Scots pines from a forest site in the Swiss Rhone valley. Our results show that Scots pines are able to maintain metabolic homeostasis in needles over a wide range of canopy defoliation levels. However, there is a metabolic tipping point at around 80-85% needle loss. Above this threshold, many stress-related metabolites (particularly osmoprotectants, defense compounds and antioxidants) increase in the needles, whereas they decrease in the fine roots. If this defoliation tipping point is exceeded, the trees are very likely to die within a few years. The different patterns between needles and roots indicate that mainly belowground carbon starvation impairs key functions for tree survival and suggest that this is an important factor explaining the increasing mortality of Scots pines.
Collapse
Affiliation(s)
- Stefan Hunziker
- Forest Dynamics, Swiss Federal Research Institute WSL, Birmensdorf 8903, Switzerland
| | - Tatiana Nazarova
- Forest Dynamics, Swiss Federal Research Institute WSL, Birmensdorf 8903, Switzerland
| | - Michel Kather
- Core Facility Metabolomics, Albert-Ludwigs-University Freiburg, Freiburg 79014, Germany
| | - Martin Hartmann
- Department of Environmental Systems Science, Institute of Agricultural Sciences, ETH Zurich, Zurich 8092, Switzerland
| | - Ivano Brunner
- Forest Soils and Biogeochemistry, Swiss Federal Research Institute WSL, Birmensdorf 8903, Switzerland
| | - Marcus Schaub
- Forest Dynamics, Swiss Federal Research Institute WSL, Birmensdorf 8903, Switzerland
| | - Andreas Rigling
- Forest Dynamics, Swiss Federal Research Institute WSL, Birmensdorf 8903, Switzerland
- Department of Environmental Systems Science, Institute of Terrestrial Ecosystems, ETH Zurich, Zurich 8092, Switzerland
| | - Christian Hug
- Forest Dynamics, Swiss Federal Research Institute WSL, Birmensdorf 8903, Switzerland
| | - Leonie Schönbeck
- Forest Dynamics, Swiss Federal Research Institute WSL, Birmensdorf 8903, Switzerland
- Department of Botany and Plant Sciences, University of California, Riverside, CA 9252, USA
| | - Arun K Bose
- Forest Dynamics, Swiss Federal Research Institute WSL, Birmensdorf 8903, Switzerland
- Forestry and Wood Technology Discipline, Khulna University, Khulna 9208, Bangladesh
| | - Bernd Kammerer
- Core Facility Metabolomics, Albert-Ludwigs-University Freiburg, Freiburg 79014, Germany
| | - Arthur Gessler
- Forest Dynamics, Swiss Federal Research Institute WSL, Birmensdorf 8903, Switzerland
- Department of Environmental Systems Science, Institute of Terrestrial Ecosystems, ETH Zurich, Zurich 8092, Switzerland
| |
Collapse
|
2
|
Benka M, Görlitz K, Schöttgen MC, Lagies S, Mohl DA, Kather M, Du Preez-Bruwer I, Mumbengegwi D, Teufel R, Kowarschik S, Huber R, Plattner DA, Kammerer B. Mass Spectrometric Analysis of Cucurbitacins and Dihydrocucurbitacins from the Tuber of Citrullus naudinianus. Biomolecules 2023; 13:1168. [PMID: 37627233 PMCID: PMC10452186 DOI: 10.3390/biom13081168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 07/11/2023] [Accepted: 07/24/2023] [Indexed: 08/27/2023] Open
Abstract
The vast pool of structurally and functionally distinct secondary metabolites (i.e., natural products (NPs)) is constantly being expanded, a process also driven by the rapid progress in the development of analytical techniques. Such NPs often show potent biological activities and are therefore prime candidates for drug development and medical applications. The ethyl acetate extract of the tuber of Citrullus naudinianus (C. naudinianus), an African melon with edible fruits and seeds, shows in vitro immunomodulatory activity presumably elicited by cucurbitacins that are known major constituents of this plant. Further potentially immunomodulatory cucurbitacins or cucurbitacin derivatives were assumed to be in the tuber. Given the typically high content of cucurbitacins with similar physicochemical features but often distinct bioactivities, an efficient and reliable separation process is a prerequisite for their detailed characterization and assessment in terms of bioactivity. We therefore developed a detection method to screen and differentiate cucurbitacins via high-performance liquid chromatography/quadrupole-time-of-flight tandem mass spectrometry (HPLC-QTOF-MS/MS). In order to confirm the identification, the fragmentation patterns of two cucurbitacins and one 23,24-dihydrocucurbitacin were also investigated. Six characteristic fragments were identified and three of them were employed for the identification of cucurbitacins and 23,24-dihydrocucurbitacins in the extract. As a result, in addition to eight previously reported cucurbitacins from this plant four distinct 23,24-dihydrocucurbitacins (B, D, E, and I) were putatively identified and newly found in the ethyl acetate extract of the tuber of C. naudinianus. The established methodology enables rapid and efficient LC-MS-based analysis and identification of cucurbitacins and 23,24-dihydrocucurbitacins in plant extracts.
Collapse
Affiliation(s)
- Moritz Benka
- Core Competence Metabolomics, Hilde-Mangold-Haus, University of Freiburg, 79104 Freiburg, Germany; (M.B.)
- Institute of Organic Chemistry, University of Freiburg, 79104 Freiburg, Germany
- Hermann Staudinger Graduate School, University of Freiburg, 79104 Freiburg, Germany
| | - Kristof Görlitz
- Core Competence Metabolomics, Hilde-Mangold-Haus, University of Freiburg, 79104 Freiburg, Germany; (M.B.)
| | - Michael C. Schöttgen
- Core Competence Metabolomics, Hilde-Mangold-Haus, University of Freiburg, 79104 Freiburg, Germany; (M.B.)
- Center for Complementary Medicine, Department of Internal Medicine II, University Hospital, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
| | - Simon Lagies
- Core Competence Metabolomics, Hilde-Mangold-Haus, University of Freiburg, 79104 Freiburg, Germany; (M.B.)
- Institute of Medical Microbiology and Hygiene, Faculty of Medicine, Medical Center—University of Freiburg, 79104 Freiburg, Germany
| | - Daniel A. Mohl
- Core Competence Metabolomics, Hilde-Mangold-Haus, University of Freiburg, 79104 Freiburg, Germany; (M.B.)
- Institute of Organic Chemistry, University of Freiburg, 79104 Freiburg, Germany
- Hermann Staudinger Graduate School, University of Freiburg, 79104 Freiburg, Germany
| | - Michel Kather
- Core Competence Metabolomics, Hilde-Mangold-Haus, University of Freiburg, 79104 Freiburg, Germany; (M.B.)
| | - Iwanette Du Preez-Bruwer
- Centre for Research Services, University of Namibia, Private Bag, Mandume, Ndemufayo Avenue, Pioneers Park, Windhoek 13301, Namibia
| | - Davis Mumbengegwi
- Centre for Research Services, University of Namibia, Private Bag, Mandume, Ndemufayo Avenue, Pioneers Park, Windhoek 13301, Namibia
| | - Robin Teufel
- Department of Pharmaceutical Sciences, University of Basel, 4056 Basel, Switzerland
| | - Stefanie Kowarschik
- Center for Complementary Medicine, Department of Internal Medicine II, University Hospital, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
| | - Roman Huber
- Center for Complementary Medicine, Department of Internal Medicine II, University Hospital, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
| | - Dietmar A. Plattner
- Institute of Organic Chemistry, University of Freiburg, 79104 Freiburg, Germany
| | - Bernd Kammerer
- Core Competence Metabolomics, Hilde-Mangold-Haus, University of Freiburg, 79104 Freiburg, Germany; (M.B.)
- Institute of Organic Chemistry, University of Freiburg, 79104 Freiburg, Germany
- BIOSS Centre for Biological Signalling Studies, University of Freiburg, 79104 Freiburg, Germany
| |
Collapse
|
3
|
Kather M, Koitzsch S, Breit B, Plontke S, Kammerer B, Liebau A. Metabolic reprogramming of inner ear cell line HEI-OC1 after dexamethasone application. Metabolomics 2021; 17:52. [PMID: 34028607 PMCID: PMC8144088 DOI: 10.1007/s11306-021-01799-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Accepted: 04/29/2021] [Indexed: 12/26/2022]
Abstract
INTRODUCTION One approach to dampen the inflammatory reactions resulting from implantation surgery of cochlear implant hearing aids is to embed dexamethasone into the matrix of the electrode carrier. Possible side effects for sensory cells in the inner ear on the metabolomics have not yet been evaluated. OBJECTIVE We examined changes in the metabolome of the HEI-OC1 cell line after dexamethasone incubation as a cell model of sensory cells of the inner ear. RESULTS AND CONCLUSION Untargeted GC-MS-profiling of metabolic alterations after dexamethasone treatment showed that dexamethasone had antithetical effects on the metabolic signature of the cells depending on growth conditions. The differentiated state of HEI-OC1 cells is better suited for elucidating metabolic changes induced by external factors. Dexamethasone treatment of differentiated cells led to an increase in intracellular amino acids and enhanced glucose uptake and β-oxidation in the cells. Increased availability of precursors for glycolysis and ATP production by β-oxidation stabilizes the energy supply in the cells, which could be assumed to be beneficial in coping with cellular stress. We found no negative effects of dexamethasone on the metabolic level, and changes may even prepare sensory cells to better overcome cellular stress following implantation surgery.
Collapse
Affiliation(s)
- Michel Kather
- Centre for Integrative Biological Signalling Studies CISA, University of Freiburg, Habsburger Straße 49, 79104, Freiburg, Germany
- Hermann Staudinger Graduate School, University of Freiburg, Hebelstr. 27, 79104, Freiburg, Germany
- Institute of Organic Chemistry, University of Freiburg, Albertstraße 21, 79104, Freiburg, Germany
| | - Sabine Koitzsch
- Department of Otorhinolaryngology-Head and Neck Surgery, Martin Luther University Halle-Wittenberg, Ernst-Grube-Straße 40, 06120, Halle (Saale), Germany
| | - Bernhard Breit
- Institute of Organic Chemistry, University of Freiburg, Albertstraße 21, 79104, Freiburg, Germany
| | - Stefan Plontke
- Department of Otorhinolaryngology-Head and Neck Surgery, Martin Luther University Halle-Wittenberg, Ernst-Grube-Straße 40, 06120, Halle (Saale), Germany
| | - Bernd Kammerer
- Centre for Integrative Biological Signalling Studies CISA, University of Freiburg, Habsburger Straße 49, 79104, Freiburg, Germany.
- Institute of Organic Chemistry, University of Freiburg, Albertstraße 21, 79104, Freiburg, Germany.
- Centre for Biological Signalling Studies BIOSS, University of Freiburg, Schänzlestraße 18, 79104, Freiburg, Germany.
- Center for Biosystems Analysis, ZBSA, University of Freiburg, Habsburgerstr. 49, 79104, Freiburg, Germany.
| | - Arne Liebau
- Department of Otorhinolaryngology-Head and Neck Surgery, Martin Luther University Halle-Wittenberg, Ernst-Grube-Straße 40, 06120, Halle (Saale), Germany.
| |
Collapse
|
4
|
Frensch B, Lechtenberg T, Kather M, Yunt Z, Betschart M, Kammerer B, Lüdeke S, Müller M, Piel J, Teufel R. Enzymatic spiroketal formation via oxidative rearrangement of pentangular polyketides. Nat Commun 2021; 12:1431. [PMID: 33664266 PMCID: PMC7933358 DOI: 10.1038/s41467-021-21432-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Accepted: 01/11/2021] [Indexed: 12/15/2022] Open
Abstract
The structural complexity and bioactivity of natural products often depend on enzymatic redox tailoring steps. This is exemplified by the generation of the bisbenzannulated [5,6]-spiroketal pharmacophore in the bacterial rubromycin family of aromatic polyketides, which exhibit a wide array of bioactivities such as the inhibition of HIV reverse transcriptase or DNA helicase. Here we elucidate the complex flavoenzyme-driven formation of the rubromycin pharmacophore that is markedly distinct from conventional (bio)synthetic strategies for spiroketal formation. Accordingly, a polycyclic aromatic precursor undergoes extensive enzymatic oxidative rearrangement catalyzed by two flavoprotein monooxygenases and a flavoprotein oxidase that ultimately results in a drastic distortion of the carbon skeleton. The one-pot in vitro reconstitution of the key enzymatic steps as well as the comprehensive characterization of reactive intermediates allow to unravel the intricate underlying reactions, during which four carbon-carbon bonds are broken and two CO2 become eliminated. This work provides detailed insight into perplexing redox tailoring enzymology that sets the stage for the (chemo)enzymatic production and bioengineering of bioactive spiroketal-containing polyketides. Rubromycin family of natural products belongs to aromatic polyketides with diverse bioactivities, but details of their biosynthesis are limited. Here, the authors report the complete in vitro reconstitution of enzymatic formation of the spiroketal moiety of rubromycin polyketides, driven by flavin-dependent enzymes, and characterize reaction intermediates.
Collapse
Affiliation(s)
- Britta Frensch
- Faculty of Biology, University of Freiburg, Schänzlestrasse 1, 79104, Freiburg, Germany
| | - Thorsten Lechtenberg
- Faculty of Biology, University of Freiburg, Schänzlestrasse 1, 79104, Freiburg, Germany
| | - Michel Kather
- BIOSS Center for Biological Signaling Studies, University of Freiburg, 79104, Freiburg, Germany
| | - Zeynep Yunt
- Department of Molecular Biology and Genetics, Koç University, Istanbul, 34450, Turkey
| | - Martin Betschart
- Institute of Pharmaceutical Sciences, University of Freiburg, 79104, Freiburg, Germany
| | - Bernd Kammerer
- BIOSS Center for Biological Signaling Studies, University of Freiburg, 79104, Freiburg, Germany.,Hermann Staudinger Graduate School, University of Freiburg, 79104, Freiburg, Germany
| | - Steffen Lüdeke
- Institute of Pharmaceutical Sciences, University of Freiburg, 79104, Freiburg, Germany
| | - Michael Müller
- Institute of Pharmaceutical Sciences, University of Freiburg, 79104, Freiburg, Germany
| | - Jörn Piel
- Institute of Microbiology, Eidgenössische Technische Hochschule (ETH) Zürich, 8093, Zürich, Switzerland
| | - Robin Teufel
- Faculty of Biology, University of Freiburg, Schänzlestrasse 1, 79104, Freiburg, Germany.
| |
Collapse
|
5
|
Liebau A, Schilp S, Mugridge K, Schön I, Kather M, Kammerer B, Tillein J, Braun S, Plontke SK. Long-Term in vivo Release Profile of Dexamethasone-Loaded Silicone Rods Implanted Into the Cochlea of Guinea Pigs. Front Neurol 2020; 10:1377. [PMID: 32038458 PMCID: PMC6987378 DOI: 10.3389/fneur.2019.01377] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Accepted: 12/13/2019] [Indexed: 11/29/2022] Open
Abstract
Glucocorticoids are used intra-operatively in cochlear implant surgeries to reduce the inflammatory reaction caused by insertion trauma and the foreign body response against the electrode carrier after cochlear implantation. To prevent higher systemic concentrations of glucocorticoids that might cause undesirable systemic side effects, the drug should be applied locally. Since rapid clearance of glucocorticoids occurs in the inner ear fluid spaces, sustained application is supposedly more effective in suppressing foreign body and tissue reactions and in preserving neuronal structures. Embedding of the glucocorticoid dexamethasone into the cochlear implant electrode carrier and its continuous release may solve this problem. The aim of the present study was to examine how dexamethasone concentrations in the electrode carrier influence drug levels in the perilymph at different time points. Silicone rods were implanted through a cochleostomy into the basal turn of the scala tympani of guinea pigs. The silicone rods were loaded homogeneously with 0.1, 1, and 10% concentrations of dexamethasone. After implantation, dexamethasone concentrations in perilymph and cochlear tissue were measured at several time points over a period of up to 7 weeks. The kinetic was concentration-dependent and showed an initial burst release in the 10%- and the 1%-dexamethasone-loaded electrode carrier dummies. The 10%-loaded electrode carrier resulted in a more elevated and longer lasting burst release than the 1%-loaded carrier. Following this initial burst release phase, sustained dexamethasone levels of about 60 and 100 ng/ml were observed in the perilymph for the 1 and 10% loaded rods, respectively, during the remainder of the observation time. The 0.1% loaded carrier dummy achieved very low perilymph drug levels of about 0.5 ng/ml. The cochlear tissue drug concentration shows a similar dynamic to the perilymph drug concentration, but only reaches about 0.005–0.05% of the perilymph drug concentration. Dexamethasone can be released from silicone electrode carrier dummies in a controlled and sustained way over a period of several weeks, leading to constant drug concentrations in the scala tympani perilymph. No accumulation of dexamethasone was observed in the cochlear tissue. In consideration of experimental studies using similar drug depots and investigating physiological effects, an effective dose range between 50 and 100 ng/ml after burst release is suggested for the CI insertion trauma model.
Collapse
Affiliation(s)
- Arne Liebau
- Department of Otorhinolaryngology, Head and Neck Surgery, Martin Luther University Halle-Wittenberg, Halle, Germany
| | | | | | - Ilona Schön
- Department of Otorhinolaryngology, Head and Neck Surgery, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Michel Kather
- Center for Biological Systems Analysis ZBSA, Albert-Ludwigs-University Freiburg, Freiburg, Germany.,Hermann Staudinger Graduate School, University of Freiburg, Freiburg, Germany
| | - Bernd Kammerer
- Center for Biological Systems Analysis ZBSA, Albert-Ludwigs-University Freiburg, Freiburg, Germany
| | | | | | - Stefan K Plontke
- Department of Otorhinolaryngology, Head and Neck Surgery, Martin Luther University Halle-Wittenberg, Halle, Germany
| |
Collapse
|
6
|
Lagies S, Schlimpert M, Braun LM, Kather M, Plagge J, Erbes T, Wittel UA, Kammerer B. Unraveling altered RNA metabolism in pancreatic cancer cells by liquid-chromatography coupling to ion mobility mass spectrometry. Anal Bioanal Chem 2019; 411:6319-6328. [PMID: 31037374 DOI: 10.1007/s00216-019-01814-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Revised: 02/27/2019] [Accepted: 03/27/2019] [Indexed: 12/12/2022]
Abstract
Ion mobility coupling to mass spectrometry facilitates enhanced identification certitude. Further coupling to liquid chromatography results in multi-dimensional analytical methods, especially suitable for complex matrices with structurally similar compounds. Modified nucleosides represent a large group of very similar members linked to aberrant proliferation. Besides basal production under physiological conditions, they are increasingly excreted by transformed cells and subsequently discussed as putative biomarkers for various cancer types. Here, we report a method for modified nucleosides covering 37 species. We determined collisional cross-sections with high reproducibility from pure analytical standards. For sample purification, we applied an optimized phenylboronic acid solid-phase extraction on media obtained from four different pancreatic cancer cell lines. Our analysis could discriminate different subtypes of pancreatic cancer cell lines. Importantly, they could clearly be separated from a pancreatic control cell line as well as blank medium. m1A, m27G, and Asm were the most important features discriminating cancer cell lines derived from well-differentiated and poorly differentiated cancers. Eventually, we suggest the analytical method reported here for future tumor-marker identification studies. Graphical abstract.
Collapse
Affiliation(s)
- Simon Lagies
- Center for Biological Systems Analysis ZBSA, Albert-Ludwigs-University Freiburg, Habsburgerstr. 49, 79104, Freiburg, Germany.,Institute of Biology II, Albert-Ludwigs-University Freiburg, Schänzlestr. 1, 79104, Freiburg, Germany.,Spemann Graduate School of Biology and Medicine, Albert-Ludwigs-University Freiburg, Albertstr. 19A, 79104, Freiburg, Germany
| | - Manuel Schlimpert
- Center for Biological Systems Analysis ZBSA, Albert-Ludwigs-University Freiburg, Habsburgerstr. 49, 79104, Freiburg, Germany.,Institute of Biology II, Albert-Ludwigs-University Freiburg, Schänzlestr. 1, 79104, Freiburg, Germany.,Spemann Graduate School of Biology and Medicine, Albert-Ludwigs-University Freiburg, Albertstr. 19A, 79104, Freiburg, Germany
| | - Lukas M Braun
- Center for Biological Systems Analysis ZBSA, Albert-Ludwigs-University Freiburg, Habsburgerstr. 49, 79104, Freiburg, Germany.,Department of General- and Visceral Surgery, University of Freiburg Medical Center, Hugstetter Str. 55, 79106, Freiburg, Germany
| | - Michel Kather
- Center for Biological Systems Analysis ZBSA, Albert-Ludwigs-University Freiburg, Habsburgerstr. 49, 79104, Freiburg, Germany.,Faculty of Chemistry and Pharmacy, Albert-Ludwigs-University Freiburg, Hebelstr. 27, 79104, Freiburg, Germany.,Hermann Staudinger Graduate School, University of Freiburg, Hebelstr. 27, 79104, Freiburg, Germany
| | - Johannes Plagge
- Center for Biological Systems Analysis ZBSA, Albert-Ludwigs-University Freiburg, Habsburgerstr. 49, 79104, Freiburg, Germany
| | - Thalia Erbes
- Department of Gynecology and Obstetrics, Faculty of Medicine and Medical Center, University of Freiburg, Hugstetter Str. 55, 79106, Freiburg, Germany
| | - Uwe A Wittel
- Department of General- and Visceral Surgery, University of Freiburg Medical Center, Hugstetter Str. 55, 79106, Freiburg, Germany
| | - Bernd Kammerer
- Center for Biological Systems Analysis ZBSA, Albert-Ludwigs-University Freiburg, Habsburgerstr. 49, 79104, Freiburg, Germany. .,BIOSS Centre for Biological Signalling Studies, University of Freiburg, Schänzlestr. 16, 79104, Freiburg, Germany.
| |
Collapse
|
7
|
Lohaus T, de Wit P, Kather M, Menne D, Benes N, Pich A, Wessling M. Tunable permeability and selectivity: Heatable inorganic porous hollow fiber membrane with a thermo-responsive microgel coating. J Memb Sci 2017. [DOI: 10.1016/j.memsci.2017.05.052] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
8
|
Pan D, Kather M, Willmann L, Schlimpert M, Bauer C, Lagies S, Schmidtkunz K, Eisenhardt SU, Jung M, Günther S, Kammerer B. Metabolic Response to XD14 Treatment in Human Breast Cancer Cell Line MCF-7. Int J Mol Sci 2016; 17:E1772. [PMID: 27783056 PMCID: PMC5085796 DOI: 10.3390/ijms17101772] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Revised: 10/04/2016] [Accepted: 10/17/2016] [Indexed: 12/26/2022] Open
Abstract
XD14 is a 4-acyl pyrrole derivative, which was discovered by a high-throughput virtual screening experiment. XD14 inhibits bromodomain and extra-terminal domain (BET) proteins (BRD2, BRD3, BRD4 and BRDT) and consequently suppresses cell proliferation. In this study, metabolic profiling reveals the molecular effects in the human breast cancer cell line MCF-7 (Michigan Cancer Foundation-7) treated by XD14. A three-day time series experiment with two concentrations of XD14 was performed. Gas chromatography-mass spectrometry (GC-MS) was applied for untargeted profiling of treated and non-treated MCF-7 cells. The gained data sets were evaluated by several statistical methods: analysis of variance (ANOVA), clustering analysis, principle component analysis (PCA), and partial least squares discriminant analysis (PLS-DA). Cell proliferation was strongly inhibited by treatment with 50 µM XD14. Samples could be discriminated by time and XD14 concentration using PLS-DA. From the 117 identified metabolites, 67 were significantly altered after XD14 treatment. These metabolites include amino acids, fatty acids, Krebs cycle and glycolysis intermediates, as well as compounds of purine and pyrimidine metabolism. This massive intervention in energy metabolism and the lack of available nucleotides could explain the decreased proliferation rate of the cancer cells.
Collapse
Affiliation(s)
- Daqiang Pan
- Center for Biological Systems Analysis ZBSA, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany.
- Institute of Pharmaceutical Sciences, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany.
| | - Michel Kather
- Center for Biological Systems Analysis ZBSA, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany.
| | - Lucas Willmann
- Center for Biological Systems Analysis ZBSA, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany.
- Institute of Biology II, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany.
| | - Manuel Schlimpert
- Center for Biological Systems Analysis ZBSA, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany.
- Spemann Graduate School of Biology and Medicine, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany.
| | - Christoph Bauer
- Center for Biological Systems Analysis ZBSA, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany.
| | - Simon Lagies
- Center for Biological Systems Analysis ZBSA, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany.
| | - Karin Schmidtkunz
- Institute of Pharmaceutical Sciences, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany.
| | - Steffen U Eisenhardt
- Department of Plastic and Hand Surgery, University of Freiburg Medical Center, 79106 Freiburg, Germany.
| | - Manfred Jung
- Institute of Pharmaceutical Sciences, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany.
| | - Stefan Günther
- Institute of Pharmaceutical Sciences, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany.
| | - Bernd Kammerer
- Center for Biological Systems Analysis ZBSA, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany.
- BIOSS Centre for Biological Signalling Studies, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany.
| |
Collapse
|
9
|
Virtanen OLJ, Brugnoni M, Kather M, Pich A, Richtering W. The next step in precipitation polymerization of N-isopropylacrylamide: particle number density control by monochain globule surface charge modulation. Polym Chem 2016. [DOI: 10.1039/c6py01195k] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Many applications of poly(N-isopropylacrylamide) microgels necessitate robust control over particle size.
Collapse
Affiliation(s)
- O. L. J. Virtanen
- Institute of Physical Chemistry
- RWTH Aachen University
- 52064 Aachen
- Germany, EU
| | - M. Brugnoni
- Institute of Physical Chemistry
- RWTH Aachen University
- 52064 Aachen
- Germany, EU
| | - M. Kather
- DWI – Leibniz Institute for Interactive Materials
- RWTH Aachen University
- 52056 Aachen
- Germany, EU
| | - A. Pich
- DWI – Leibniz Institute for Interactive Materials
- RWTH Aachen University
- 52056 Aachen
- Germany, EU
| | - W. Richtering
- Institute of Physical Chemistry
- RWTH Aachen University
- 52064 Aachen
- Germany, EU
| |
Collapse
|