1
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Taisz I, Donà E, Münch D, Bailey SN, Morris BJ, Meechan KI, Stevens KM, Varela-Martínez I, Gkantia M, Schlegel P, Ribeiro C, Jefferis GSXE, Galili DS. Generating parallel representations of position and identity in the olfactory system. Cell 2023; 186:2556-2573.e22. [PMID: 37236194 PMCID: PMC10403364 DOI: 10.1016/j.cell.2023.04.038] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Revised: 12/07/2022] [Accepted: 04/28/2023] [Indexed: 05/28/2023]
Abstract
In Drosophila, a dedicated olfactory channel senses a male pheromone, cis-vaccenyl acetate (cVA), promoting female courtship while repelling males. Here, we show that separate cVA-processing streams extract qualitative and positional information. cVA sensory neurons respond to concentration differences in a 5-mm range around a male. Second-order projection neurons encode the angular position of a male by detecting inter-antennal differences in cVA concentration, which are amplified through contralateral inhibition. At the third circuit layer, we identify 47 cell types with diverse input-output connectivity. One population responds tonically to male flies, a second is tuned to olfactory looming, while a third integrates cVA and taste to coincidentally promote female mating. The separation of olfactory features resembles the mammalian what and where visual streams; together with multisensory integration, this enables behavioral responses appropriate to specific ethological contexts.
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Affiliation(s)
- István Taisz
- Neurobiology Division, MRC Laboratory of Molecular Biology, Cambridge, UK
| | - Erika Donà
- Neurobiology Division, MRC Laboratory of Molecular Biology, Cambridge, UK
| | | | | | - Billy J Morris
- Department of Zoology, University of Cambridge, Cambridge, UK
| | | | - Katie M Stevens
- Department of Zoology, University of Cambridge, Cambridge, UK
| | | | - Marina Gkantia
- Neurobiology Division, MRC Laboratory of Molecular Biology, Cambridge, UK
| | - Philipp Schlegel
- Neurobiology Division, MRC Laboratory of Molecular Biology, Cambridge, UK; Department of Zoology, University of Cambridge, Cambridge, UK
| | | | - Gregory S X E Jefferis
- Neurobiology Division, MRC Laboratory of Molecular Biology, Cambridge, UK; Department of Zoology, University of Cambridge, Cambridge, UK.
| | - Dana S Galili
- Neurobiology Division, MRC Laboratory of Molecular Biology, Cambridge, UK.
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2
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Suliga P, Abie SM, Egelandsdal B, Alvseike O, Johny A, Kathiresan P, Münch D. Beyond standard PSE testing: An exploratory study of bioimpedance as a marker for ham defects. Meat Sci 2022; 194:108980. [PMID: 36148720 DOI: 10.1016/j.meatsci.2022.108980] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 09/06/2022] [Accepted: 09/09/2022] [Indexed: 11/29/2022]
Abstract
During post-mortem conversion from muscle to meat, diverse quality anomalies can emerge. Recent pork defects are often accompanied by deteriorating fibre structure. Here we investigate how bioimpedance response, an indicator of structural disintegration, can help in detecting quality defects. We, first, measured the relationship between standard meat quality variables (pHu, CIELAB, drip loss) and bioimpedance (BI) response. To screen for defect-biomarkers that are linked to aberrant bioimpedance and physicochemical indicators of quality decline, we performed LC-MS/MS proteomic analysis on samples, classified with a multivariate-based separation into good versus poor quality. We found that BI correlated significantly with, e.g., colour and drip loss. Proteomics revealed eleven proteins to be unique for either, good or poor ham quality groups, and maybe linked to structural degradation. In all, our data supports a wider integration of BI testing in pork quality testing to assess structural disintegration, which can render ham unsuitable for, e.g., costly curing.
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Affiliation(s)
- Paweł Suliga
- Faculty of Ecology and Natural Resource Management, Norwegian University of Life Sciences, 1432 Ås, Norway.
| | - Sisay Mebre Abie
- Faculty of Ecology and Natural Resource Management, Norwegian University of Life Sciences, 1432 Ås, Norway
| | - Bjørg Egelandsdal
- Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, 1432 Ås, Norway
| | - Ole Alvseike
- Animalia, Norwegian Meat and Poultry Research Centre, 0513 Oslo, Norway
| | - Amritha Johny
- Nofima, Norwegian Institute of Food, Fisheries and Aquaculture Research, 1430 Ås, Norway
| | | | - Daniel Münch
- Faculty of Ecology and Natural Resource Management, Norwegian University of Life Sciences, 1432 Ås, Norway; Animalia, Norwegian Meat and Poultry Research Centre, 0513 Oslo, Norway
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3
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Salmela H, Harwood GP, Münch D, Elsik CG, Herrero-Galán E, Vartiainen MK, Amdam GV. Nuclear translocation of vitellogenin in the honey bee ( Apis mellifera). Apidologie 2022; 53:13. [PMID: 35309709 PMCID: PMC8924143 DOI: 10.1007/s13592-022-00914-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 11/10/2021] [Accepted: 12/18/2021] [Indexed: 05/27/2023]
Abstract
UNLABELLED Vitellogenin (Vg) is a conserved protein used by nearly all oviparous animals to produce eggs. It is also pleiotropic and performs functions in oxidative stress resistance, immunity, and, in honey bees, behavioral development of the worker caste. It has remained enigmatic how Vg affects multiple traits. Here, we asked whether Vg enters the nucleus and acts via DNA-binding. We used cell fractionation, immunohistology, and cell culture to show that a structural subunit of honey bee Vg translocates into cell nuclei. We then demonstrated Vg-DNA binding theoretically and empirically with prediction software and chromatin immunoprecipitation with sequencing (ChIP-seq), finding binding sites at genes influencing immunity and behavior. Finally, we investigated the immunological and enzymatic conditions affecting Vg cleavage and nuclear translocation and constructed a 3D structural model. Our data are the first to show Vg in the nucleus and suggest a new fundamental regulatory role for this ubiquitous protein. SUPPLEMENTARY INFORMATION The online version contains supplementary material available at 10.1007/s13592-022-00914-9.
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Affiliation(s)
- Heli Salmela
- Organismal and Evolutionary Biology Research Program, University of Helsinki, Viikinkaari 1, 00014 Helsinki, FI Finland
| | - Gyan P. Harwood
- Department of Entomology, University of Illinois at Urbana-Champaign, 320 Morrill Hall 505 South Goodwin Avenue, Urbana, IL 61801 USA
| | - Daniel Münch
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, N-1432 Aas, Norway
| | - Christine G. Elsik
- Division of Animal Sciences, University of Missouri, S108 Animal Sciences Research Center (ASRC), Colombia, MO 65211 USA
| | | | - Maria K. Vartiainen
- Institute of Biotechnology, Helsinki Institute of Life Science, University of Helsinki, Viikinkaari 5, 00014 Helsinki, Finland
| | - Gro V. Amdam
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, N-1432 Aas, Norway
- School of Life Sciences, Arizona State University, 427 East Tyler Mall, Tempe, AZ 85281 USA
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4
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Osen DE, Abie SM, Martinsen ØG, Egelandsdal B, Münch D. Bioimpedance-based Authentication of Defrosted Versus Fresh Pork at the End of Refrigerated Shelf Life. J Electr Bioimpedance 2022; 13:125-131. [PMID: 36699663 PMCID: PMC9837875 DOI: 10.2478/joeb-2022-0017] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Indexed: 06/17/2023]
Abstract
Correct food labeling is a legal requirement and helps consumers to make informed purchasing choices. Mislabeling defrosted meat as fresh is illegal in the EU. However, there are no standardized technologies to authenticate fresh versus defrosted meat. We address this by testing if bioimpedance-based measurements can separate defrosted meat from refrigerated-only meat at the end of shelf life, i.e., when also fresh meat shows deterioration. Pork sirloin samples from 20 pigs were first tested at 12 days postmortem ('fresh group'). This time point was chosen to represent a typical use-by date for refrigerated storage of fresh pork. Then, all samples were transferred to a -24°C freezer for 3 days and thawed for 2 days before final testing ('frozen-thawed group'). Bioimpedance analyses (BIA) were done in a frequency range of [102-106 Hz]. Weight, pH and electrode positioning were assessed to test for potential confounding effects. Statistics for treatment dependent differences were based on the established Py parameter and phase angle, which were extracted from the BI spectra. We found that using bioimpedance testing with tetrapolar electrodes, Py and phase angle allowed almost complete separation of fresh and previously frozen samples. However, within the whole sample population, there was some overlap between the spectra of fresh and frozen samples. Yet, based on Py, only one fresh sample (5% of Ntotal=20) fell in the lowest Py class with all the frozen samples. We used a multifactorial design that allowed to test the effects of potential confounding factors, such as electrode positioning and meat quality parameters. We found a relatively low explained variance for the Py parameter, indicating that confounding effects from other factors or quality defects in fresh pork may affect the detection capacity of bioimpedance-based authentication of fresh pork. Our data, therefore, suggest that reliable fresh-label authentication with bioimpedance testing should be based on testing a small number of samples to represent a specific lot of pork that is to be inspected.
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Affiliation(s)
- Daniel E. Osen
- Department of Physics, University of Oslo, 0316Oslo, Norway
| | - Sisay Mebre Abie
- Department of Physics, University of Oslo, 0316Oslo, Norway
- Faculty of Ecology and Natural Resource Management, Norwegian University of Life Sciences, 1432 Ås, Oslo, Norway
| | - Ørjan G. Martinsen
- Department of Physics, University of Oslo, 0316Oslo, Norway
- Department of Clinical and Biomedical Engineering, Oslo University Hospital, 0372Oslo, Norway
| | - Bjørg Egelandsdal
- Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, 1432 Ås, Oslo, Norway
| | - Daniel Münch
- Animalia, Norwegian Meat and Poultry Research Center, 0513Oslo, Norway
- Faculty of Ecology and Natural Resource Management, Norwegian University of Life Sciences, 1432 Ås, Oslo, Norway
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Abie SM, Münch D, Egelandsdal B, Bjerke F, Wergeland I, Martinsen ØG. Combined 0.2 T static magnetic field and 20 kHz, 2 V/cm square wave electric field do not affect supercooling and freezing time of saline solution and meat samples. J FOOD ENG 2021. [DOI: 10.1016/j.jfoodeng.2021.110710] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Rasmussen EMK, Seier KL, Pedersen IK, Kreibich C, Amdam GV, Münch D, Dahl JA. Screening bioactive food compounds in honey bees suggests curcumin blocks alcohol-induced damage to longevity and DNA methylation. Sci Rep 2021; 11:19156. [PMID: 34580381 PMCID: PMC8476562 DOI: 10.1038/s41598-021-98614-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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: 05/24/2021] [Accepted: 09/06/2021] [Indexed: 02/08/2023] Open
Abstract
Various bioactive food compounds may confer health and longevity benefits, possibly through altering or preserving the epigenome. While bioactive food compounds are widely being marketed for human consumption as 'improving health and longevity' by counteracting harmful effects of poor nutrition and lifestyle, claimed effects are often not adequately documented. Using the honey bee (Apis mellifera) as a model species, we here employed a multi-step screening approach to investigate seven compounds for effects on lifespan and DNA methylation using ELISA and whole genome bisulfite sequencing (WGBS). A positive longevity effect was detected for valproic acid, isovaleric acid, and cyanocobalamin. For curcumin, we found that lifespan shortening caused by ethanol intake, was restored when curcumin and ethanol were co-administered. Furthermore, we identified region specific DNA methylation changes as a result of ethanol intake. Ethanol specific changes in DNA methylation were fully or partially blocked in honey bees receiving ethanol and curcumin together. Ethanol-affected and curcumin-blocked differentially methylated regions covered genes involved in fertility, temperature regulation and tubulin transport. Our results demonstrate fundamental negative effects of low dose ethanol consumption on lifespan and associated DNA methylation changes and present a proof-of-principle on how longevity and DNA methylation changes can be negated by the bioactive food component curcumin. Our findings provide a fundament for further studies of curcumin in invertebrates.
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Affiliation(s)
- Erik M K Rasmussen
- Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, 1433, Aas, Norway.
- Faculty of Veterinary Medicine, Norwegian University of Life Sciences, 1433, Aas, Norway.
| | - Kristine L Seier
- Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, 1433, Aas, Norway
- Vestre Viken Hospital Trust, 3004, Drammen, Norway
| | - Ingrid K Pedersen
- Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, 1433, Aas, Norway
- Institute for Energy Technology, 2007, Kjeller, Norway
| | - Claus Kreibich
- Faculty of Ecology and Natural Resource Management, Norwegian University of Life Sciences, 1433, Aas, Norway
| | - Gro V Amdam
- Faculty of Ecology and Natural Resource Management, Norwegian University of Life Sciences, 1433, Aas, Norway
- School of Life Sciences, Arizona State University, Tempe, AZ, USA
| | - Daniel Münch
- Faculty of Ecology and Natural Resource Management, Norwegian University of Life Sciences, 1433, Aas, Norway.
- Animalia - Norwegian Meat and Poultry Research Centre, 0513, Oslo, Norway.
| | - John Arne Dahl
- Department of Microbiology, Oslo University Hospital, Rikshospitalet, 0027, Oslo, Norway.
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Abie SM, Martinsen ØG, Egelandsdal B, Hou J, Bjerke F, Mason A, Münch D. Feasibility of Using Electrical Impedance Spectroscopy for Assessing Biological Cell Damage during Freezing and Thawing. Sensors (Basel) 2021; 21:s21124129. [PMID: 34208559 PMCID: PMC8235392 DOI: 10.3390/s21124129] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/25/2021] [Revised: 06/08/2021] [Accepted: 06/12/2021] [Indexed: 11/16/2022]
Abstract
This study was performed to test bioimpedance as a tool to detect the effect of different thawing methods on meat quality to aid in the eventual creation of an electric impedance-based food quality monitoring system. The electric impedance was measured for fresh pork, thawed pork, and during quick and slow thawing. A clear difference was observed between fresh and thawed samples for both impedance parameters. Impedance was different between the fresh and the frozen-thawed samples, but there were no impedance differences between frozen-thawed samples and the ones that were frozen-thawed and then stored at +3 °C for an additional 16 h after thawing. The phase angle was also different between fresh and the frozen-thawed samples. At high frequency, there were small, but clear phase angle differences between frozen-thawed samples and the samples that were frozen-thawed and subsequently stored for more than 16 h at +3 °C. Furthermore, the deep learning model LSTM-RNN (long short-term memory recurrent neural network) was found to be a promising way to classify the different methods of thawing.
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Affiliation(s)
- Sisay Mebre Abie
- Department of Physics, University of Oslo, 0316 Oslo, Norway; (S.M.A.); (J.H.)
| | - Ørjan Grøttem Martinsen
- Department of Physics, University of Oslo, 0316 Oslo, Norway; (S.M.A.); (J.H.)
- Department of Clinical and Biomedical Engineering, Oslo University Hospital, 0372 Oslo, Norway
- Correspondence: ; Tel.: +47-22856474
| | - Bjørg Egelandsdal
- Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, 1432 Ås, Norway;
| | - Jie Hou
- Department of Physics, University of Oslo, 0316 Oslo, Norway; (S.M.A.); (J.H.)
- Department of Clinical and Biomedical Engineering, Oslo University Hospital, 0372 Oslo, Norway
| | - Frøydis Bjerke
- Animalia, Norwegian Meat and Poultry Research Centre, 0513 Oslo, Norway; (F.B.); or or (D.M.)
| | - Alex Mason
- Animalia, Norwegian Meat and Poultry Research Centre, 0513 Oslo, Norway; (F.B.); or or (D.M.)
- Faculty of Science and Technology, Norwegian University of Life Sciences, 1432 Ås, Norway
| | - Daniel Münch
- Animalia, Norwegian Meat and Poultry Research Centre, 0513 Oslo, Norway; (F.B.); or or (D.M.)
- Faculty of Ecology and Natural Resource Management, Norwegian University of Life Sciences, 1432 Aas, Norway
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Baden T, Maina MB, Maia Chagas A, Mohammed YG, Auer TO, Silbering A, von Tobel L, Pertin M, Hartig R, Aleksic J, Akinrinade I, Awadelkareem MA, Koumoundourou A, Jones A, Arieti F, Beale A, Münch D, Salek SC, Yusuf S, Prieto-Godino LL. TReND in Africa: Toward a Truly Global (Neuro)science Community. Neuron 2020; 107:412-416. [PMID: 32692973 PMCID: PMC7370902 DOI: 10.1016/j.neuron.2020.06.026] [Citation(s) in RCA: 3] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Revised: 06/16/2020] [Accepted: 06/22/2020] [Indexed: 11/06/2022]
Abstract
TReND is a volunteer-scientist run charity dedicated to promoting research and education on the African continent. Focusing on neuroscience, we discuss approaches to address some of the factors that currently stifle Africa’s scientific development and our experience in implementing them.
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Affiliation(s)
- Tom Baden
- School of Life Sciences, University of Sussex, Sussex, UK; Department of Ophthalmic Research, University of Tübingen, Tübingen, Germany; TReND in Africa, Brighton, UK.
| | - Mahmoud Bukar Maina
- School of Life Sciences, University of Sussex, Sussex, UK; TReND in Africa, Brighton, UK; College of Medical Sciences, Yobe State University, Damaturu, Yobe State, Nigeria
| | - Andre Maia Chagas
- School of Life Sciences, University of Sussex, Sussex, UK; TReND in Africa, Brighton, UK
| | - Yunusa Garba Mohammed
- TReND in Africa, Brighton, UK; College of Medical Sciences, Gombe State University, Gombe State, Nigeria
| | - Thomas O Auer
- TReND in Africa, Brighton, UK; Centre for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland
| | - Ana Silbering
- TReND in Africa, Brighton, UK; Medical Education Unit, School of Medicine, University of Lausanne, Lausanne, Switzerland
| | | | - Marie Pertin
- TReND in Africa, Brighton, UK; Pain Centre, Department of Anaesthesiology, Lausanne University Hospital (CHUV), Lausanne, Switzerland
| | - Renee Hartig
- TReND in Africa, Brighton, UK; Max Planck Institute for Biological Cybernetics, Tübingen, Germany; Focus Program Translational Neurosciences, University Medical Center, Johannes Gutenberg University Mainz, Mainz, Germany
| | - Jelena Aleksic
- TReND in Africa, Brighton, UK; SparkBio Ltd, Cambridge, UK
| | - Ibukun Akinrinade
- TReND in Africa, Brighton, UK; Instituto Gulbenkian de Ciência, Oeiras, Portugal
| | - Mosab A Awadelkareem
- TReND in Africa, Brighton, UK; Faculty of Medical Laboratory Sciences, Al-Neelain University, Khartoum, Sudan
| | - Artemis Koumoundourou
- TReND in Africa, Brighton, UK; Institute of Molecular and Cellular Anatomy, Ulm University, Ulm, Germany
| | - Aled Jones
- TReND in Africa, Brighton, UK; Viapath Genetic Laboratories, London, UK
| | - Fabiana Arieti
- TReND in Africa, Brighton, UK; Infectious Diseases Section, Department of Diagnostic and Public Health, University of Verona, Verona, Italy
| | - Andrew Beale
- TReND in Africa, Brighton, UK; MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge, UK
| | - Daniel Münch
- TReND in Africa, Brighton, UK; Champalimaud Centre for the Unknown, Lisbon, Portugal
| | - Samyra Cury Salek
- School of Life Sciences, University of Sussex, Sussex, UK; TReND in Africa, Brighton, UK
| | - Sadiq Yusuf
- TReND in Africa, Brighton, UK; Uganda Management and Technology University, Kampala, Uganda
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Abie SM, Münch D, Bergli J. Monitoring Electric Impedance During Freezing and Thawing of Saline and De-ionized Water. J Electr Bioimpedance 2020; 11:106-111. [PMID: 33584911 PMCID: PMC7851981 DOI: 10.2478/joeb-2020-0016] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Indexed: 06/12/2023]
Abstract
Physiological saline (0.9% NaCl) and deionized water were frozen in a laboratory chest freezer and impedance was monitored throughout freezing and thawing. The resistive and reactive components of electrical impedance were measured for these samples during freezing and thawing (heating) within a temperature range between 20 °C and -48 °C. The impedance of saline solution and de-ionized water increases sharply at the freezing point, similar to what is known for, e.g., complex tissues, including meat. Yet, only the saline solution impedance shows another sharp increment at a temperature between -30 and -20 °C. Changes of the electric properties after solidification suggest that the latter is linked to transformations of the ice lattice structure. We conclude that the electrical properties might serve as sensitive indicators of these phase changes.
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Affiliation(s)
| | - Daniel Münch
- Faculty of Ecology and Natural Resource Management, Norwegian University of Life Sciences, 1432Aas, Norway
- Animalia – Norwegian Meat and Poultry Research Centre, 0585Oslo, Norway
| | - Joakim Bergli
- Department of Physics, University of Oslo, 0316Oslo, Norway
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Münch D, Ezra-Nevo G, Francisco AP, Tastekin I, Ribeiro C. Nutrient homeostasis - translating internal states to behavior. Curr Opin Neurobiol 2019; 60:67-75. [PMID: 31816522 DOI: 10.1016/j.conb.2019.10.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 10/29/2019] [Accepted: 10/30/2019] [Indexed: 12/21/2022]
Abstract
Behavioral neuroscience aims to describe a causal relationship between neuronal processes and behavior. Animals' ever-changing physiological needs alter their internal states. Internal states then alter neuronal processes to adapt the behavior of the animal enabling it to meet its needs. Here, we describe nutrient-specific appetites as an attractive framework to study how internal states shape complex neuronal processes and resulting behavioral outcomes. Understanding how neurons detect nutrient states and how these are integrated at the level of neuronal circuits will provide a multilevel description of the mechanisms underlying complex feeding and foraging decisions.
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Affiliation(s)
- Daniel Münch
- Champalimaud Centre for the Unknown, Lisbon, Portugal
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11
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Sánchez-Alcañiz JA, Silbering AF, Croset V, Zappia G, Sivasubramaniam AK, Abuin L, Sahai SY, Münch D, Steck K, Auer TO, Cruchet S, Neagu-Maier GL, Sprecher SG, Ribeiro C, Yapici N, Benton R. An expression atlas of variant ionotropic glutamate receptors identifies a molecular basis of carbonation sensing. Nat Commun 2018; 9:4252. [PMID: 30315166 PMCID: PMC6185939 DOI: 10.1038/s41467-018-06453-1] [Citation(s) in RCA: 78] [Impact Index Per Article: 13.0] [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] [Indexed: 01/21/2023] Open
Abstract
Through analysis of the Drosophila ionotropic receptors (IRs), a family of variant ionotropic glutamate receptors, we reveal that most IRs are expressed in peripheral neuron populations in diverse gustatory organs in larvae and adults. We characterise IR56d, which defines two anatomically-distinct neuron classes in the proboscis: one responds to carbonated solutions and fatty acids while the other represents a subset of sugar- and fatty acid-sensing cells. Mutational analysis indicates that IR56d, together with the broadly-expressed co-receptors IR25a and IR76b, is essential for physiological responses to carbonation and fatty acids, but not sugars. We further demonstrate that carbonation and fatty acids both promote IR56d-dependent attraction of flies, but through different behavioural outputs. Our work provides a toolkit for investigating taste functions of IRs, defines a subset of these receptors required for carbonation sensing, and illustrates how the gustatory system uses combinatorial expression of sensory molecules in distinct neurons to coordinate behaviour. Little is known about the role of variant ionotropic glutamate receptors (IRs) in insect taste. Here the authors characterise the expression pattern of IRs in the Drosophila gustatory system and highlight the role of one receptor, IR56d, in the detection of carbonation
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Affiliation(s)
- Juan Antonio Sánchez-Alcañiz
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, Génopode Building, Lausanne, CH-1015, Switzerland
| | - Ana Florencia Silbering
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, Génopode Building, Lausanne, CH-1015, Switzerland
| | - Vincent Croset
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, Génopode Building, Lausanne, CH-1015, Switzerland.,Centre for Neural Circuits and Behaviour, University of Oxford, Tinsley Building, Mansfield Road, Oxford, OX1 3SR, United Kingdom
| | - Giovanna Zappia
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, Génopode Building, Lausanne, CH-1015, Switzerland
| | - Anantha Krishna Sivasubramaniam
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, Génopode Building, Lausanne, CH-1015, Switzerland
| | - Liliane Abuin
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, Génopode Building, Lausanne, CH-1015, Switzerland
| | - Saumya Yashmohini Sahai
- Department of Neurobiology and Behavior, Cornell University, W153 Mudd Hall, Ithaca, NY, 14853, USA
| | - Daniel Münch
- Champalimaud Centre for the Unknown, Lisbon, 1400-038, Portugal
| | - Kathrin Steck
- Champalimaud Centre for the Unknown, Lisbon, 1400-038, Portugal
| | - Thomas O Auer
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, Génopode Building, Lausanne, CH-1015, Switzerland
| | - Steeve Cruchet
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, Génopode Building, Lausanne, CH-1015, Switzerland
| | - G Larisa Neagu-Maier
- Department of Biology, Institute of Zoology, University of Fribourg, Chemin du Musée 10, Fribourg, CH-1700, Switzerland
| | - Simon G Sprecher
- Department of Biology, Institute of Zoology, University of Fribourg, Chemin du Musée 10, Fribourg, CH-1700, Switzerland
| | - Carlos Ribeiro
- Champalimaud Centre for the Unknown, Lisbon, 1400-038, Portugal
| | - Nilay Yapici
- Department of Neurobiology and Behavior, Cornell University, W153 Mudd Hall, Ithaca, NY, 14853, USA
| | - Richard Benton
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, Génopode Building, Lausanne, CH-1015, Switzerland.
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Shah AK, Kreibich CD, Amdam GV, Münch D. Metabolic enzymes in glial cells of the honeybee brain and their associations with aging, starvation and food response. PLoS One 2018; 13:e0198322. [PMID: 29927967 PMCID: PMC6013123 DOI: 10.1371/journal.pone.0198322] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Accepted: 05/17/2018] [Indexed: 12/03/2022] Open
Abstract
The honey bee has been extensively studied as a model for neuronal circuit and memory function and more recently has emerged as an unconventional model in biogerontology. Yet, the detailed knowledge of neuronal processing in the honey bee brain contrasts with the very sparse information available on glial cells. In other systems glial cells are involved in nutritional homeostasis, detoxification, and aging. These glial functions have been linked to metabolic enzymes, such as glutamine synthetase and glycogen phosphorylase. As a step in identifying functional roles and potential differences among honey bee glial types, we examined the spatial distribution of these enzymes and asked if enzyme abundance is associated with aging and other processes essential for survival. Using immunohistochemistry and confocal laser microscopy we demonstrate that glutamine synthetase and glycogen phosphorylase are abundant in glia but appear to co-localize with different glial sub-types. The overall spatial distribution of both enzymes was not homogenous and differed markedly between different neuropiles and also within each neuropil. Using semi-quantitative Western blotting we found that rapid aging, typically observed in shortest-lived worker bees (foragers), was associated with declining enzyme levels. Further, we found enzyme abundance changes after severe starvation stress, and that glutamine synthetase is associated with food response. Together, our data indicate that aging and nutritional physiology in bees are linked to glial specific metabolic enzymes. Enzyme specific localization patterns suggest a functional differentiation among identified glial types.
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Affiliation(s)
- Ashish K. Shah
- Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, Aas, Norway
| | - Claus D. Kreibich
- Faculty of Ecology and Natural Resource Management, Norwegian University of Life Sciences, Aas, Norway
| | - Gro V. Amdam
- Faculty of Ecology and Natural Resource Management, Norwegian University of Life Sciences, Aas, Norway
- School of Life Sciences, Arizona State University, Tempe, Arizona, United States of America
| | - Daniel Münch
- Faculty of Ecology and Natural Resource Management, Norwegian University of Life Sciences, Aas, Norway
- * E-mail:
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Dickel F, Münch D, Amdam GV, Mappes J, Freitak D. Increased survival of honeybees in the laboratory after simultaneous exposure to low doses of pesticides and bacteria. PLoS One 2018; 13:e0191256. [PMID: 29385177 PMCID: PMC5791986 DOI: 10.1371/journal.pone.0191256] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Accepted: 01/02/2018] [Indexed: 12/17/2022] Open
Abstract
Recent studies of honeybees and bumblebees have examined combinatory effects of different stressors, as insect pollinators are naturally exposed to multiple stressors. At the same time the potential influences of simultaneously occurring agricultural agents on insect pollinator health remain largely unknown. Due to different farming methods, and the drift of applied agents and manure, pollinators are most probably exposed to insecticides but also bacteria from organic fertilizers at the same time. We orally exposed honeybee workers to sub-lethal doses of the insecticide thiacloprid and two strains of the bacterium Enterococcus faecalis, which can occur in manure from farming animals. Our results show that under laboratory conditions the bees simultaneously exposed to the a bacterium and the pesticide thiacloprid thiacloprid had significant higher survival rates 11 days post exposure than the controls, which surprisingly showed the lowest survival. Bees that were exposed to diet containing thiacloprid showed decreased food intake. General antibacterial activity is increased by the insecticide and the bacteria, resulting in a higher immune response observed in treated individuals compared to control individuals. We thus propose that caloric restriction through behavioural and physiological adaptations may have mediated an improved survival and stress resistance in our tests. However, the decreased food consumption could in long-term also result in possible negative effects at colony level. Our study does not show an additive negative impact of sub-lethal insecticide and bacteria doses, when tested under laboratory conditions. In contrast, we report seemingly beneficial effects of simultaneous exposure of bees to agricultural agents, which might demonstrate a surprising biological capacity for coping with stressors, possibly through hormetic regulation.
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Affiliation(s)
- Franziska Dickel
- Centre of Excellence in Biological Interactions, Department of Biological and Environmental Science, University of Jyvaskyla, Jyvaskyla, Finland
| | - Daniel Münch
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, Aas, Norway
| | - Gro Vang Amdam
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, Aas, Norway
- School of Life Sciences, Arizona State University, Tempe, United States of America
| | - Johanna Mappes
- Centre of Excellence in Biological Interactions, Department of Biological and Environmental Science, University of Jyvaskyla, Jyvaskyla, Finland
| | - Dalial Freitak
- Centre of Excellence in Biological Interactions, Department of Biosciences, University of Helsinki, Helsinki, Finland
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14
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Hystad EM, Salmela H, Amdam GV, Münch D. Hemocyte-mediated phagocytosis differs between honey bee (Apis mellifera) worker castes. PLoS One 2017; 12:e0184108. [PMID: 28877227 PMCID: PMC5587260 DOI: 10.1371/journal.pone.0184108] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Accepted: 08/17/2017] [Indexed: 02/06/2023] Open
Abstract
Honey bees as other insects rely on the innate immune system for protection against diseases. The innate immune system includes the circulating hemocytes (immune cells) that clear pathogens from hemolymph (blood) by phagocytosis, nodulation or encapsulation. Honey bee hemocyte numbers have been linked to hemolymph levels of vitellogenin. Vitellogenin is a multifunctional protein with immune-supportive functions identified in a range of species, including the honey bee. Hemocyte numbers can increase via mitosis, and this recruitment process can be important for immune system function and maintenance. Here, we tested if hemocyte mediated phagocytosis differs among the physiologically different honey bee worker castes (nurses, foragers and winter bees), and study possible interactions with vitellogenin and hemocyte recruitment. To this end, we adapted phagocytosis assays, which—together with confocal microscopy and flow cytometry—allow qualitative and quantitative assessment of hemocyte performance. We found that nurses are more efficient in phagocytic uptake than both foragers and winter bees. We detected vitellogenin within the hemocytes, and found that winter bees have the highest numbers of vitellogenin-positive hemocytes. Connections between phagocytosis, hemocyte-vitellogenin and mitosis were worker caste dependent. Our results demonstrate that the phagocytic performance of immune cells differs significantly between honey bee worker castes, and support increased immune competence in nurses as compared to forager bees. Our data, moreover, provides support for roles of vitellogenin in hemocyte activity.
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Affiliation(s)
- Eva Marit Hystad
- Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, Aas, Norway
- * E-mail:
| | - Heli Salmela
- Department of Biosciences, Centre of Excellence in Biological Interactions, University of Helsinki, Helsinki, Finland
| | - Gro Vang Amdam
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, Aas, Norway
- School of Life Sciences, Arizona State University, Tempe, Arizona, United States of America
| | - Daniel Münch
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, Aas, Norway
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15
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Münch D, Galizia CG. Take time: odor coding capacity across sensory neurons increases over time in Drosophila. J Comp Physiol A Neuroethol Sens Neural Behav Physiol 2017; 203:959-972. [PMID: 28852844 PMCID: PMC5696509 DOI: 10.1007/s00359-017-1209-1] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2017] [Revised: 08/11/2017] [Accepted: 08/14/2017] [Indexed: 11/25/2022]
Abstract
Due to the highly efficient olfactory code, olfactory sensory systems are able to reliably encode enormous numbers of olfactory stimuli. The olfactory code consists of combinatorial activation patterns across sensory neurons, thus its capacity exceeds the number of involved classes of sensory neurons by a manifold. Activation patterns are not static but vary over time, caused by the temporally complex response dynamics of the individual sensory neuron responses. We systematically analyzed the temporal dynamics of olfactory sensory neuron responses to a diverse set of odorants. We find that response dynamics depend on the combination of sensory neuron and odorant and that information about odorant identity can be extracted from the time course of the response. We also show that new response dynamics can arise when mixing two odorants. Our data show that temporal dynamics of odorant responses are able to significantly enhance the coding capacity of olfactory sensory systems.
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Affiliation(s)
- Daniel Münch
- Neurobiology, University of Konstanz, 78457, Konstanz, Germany. .,Champalimaud Neuroscience Programme, Champalimaud Centre for the Unknown, Av. Brasília, 1400-038, Lisbon, Portugal.
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16
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17
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Zwaka H, Münch D, Manz G, Menzel R, Rybak J. The Circuitry of Olfactory Projection Neurons in the Brain of the Honeybee, Apis mellifera. Front Neuroanat 2016; 10:90. [PMID: 27746723 PMCID: PMC5040750 DOI: 10.3389/fnana.2016.00090] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [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: 04/09/2016] [Accepted: 09/12/2016] [Indexed: 11/13/2022] Open
Abstract
In the honeybee brain, two prominent tracts - the medial and the lateral antennal lobe tract - project from the primary olfactory center, the antennal lobes (ALs), to the central brain, the mushroom bodies (MBs), and the protocerebral lobe (PL). Intracellularly stained uniglomerular projection neurons were reconstructed, registered to the 3D honeybee standard brain atlas, and then used to derive the spatial properties and quantitative morphology of the neurons of both tracts. We evaluated putative synaptic contacts of projection neurons (PNs) using confocal microscopy. Analysis of the patterns of axon terminals revealed a domain-like innervation within the MB lip neuropil. PNs of the lateral tract arborized more sparsely within the lips and exhibited fewer synaptic boutons, while medial tract neurons occupied broader regions in the MB calyces and the PL. Our data show that uPNs from the medial and lateral tract innervate both the core and the cortex of the ipsilateral MB lip but differ in their innervation patterns in these regions. In the mushroombody neuropil collar we found evidence for ALT boutons suggesting the collar as a multi modal input site including olfactory input similar to lip and basal ring. In addition, our data support the conclusion drawn in previous studies that reciprocal synapses exist between PNs, octopaminergic-, and GABAergic cells in the MB calyces. For the first time, we found evidence for connections between both tracts within the AL.
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Affiliation(s)
- Hanna Zwaka
- Institute of Neurobiology, Free University BerlinBerlin, Germany; Abteilung Genetik von Lernen und Gedächtnis, Leibniz Institut für NeurobiologieMagdeburg, Germany
| | - Daniel Münch
- Neurobiology, University of Konstanz Konstanz, Germany
| | - Gisela Manz
- Institute of Neurobiology, Free University Berlin Berlin, Germany
| | - Randolf Menzel
- Institute of Neurobiology, Free University BerlinBerlin, Germany; Bernstein Center for Computational NeuroscienceBerlin, Germany
| | - Jürgen Rybak
- Department of Evolutionary Neuroethology, Max Planck Institute for Chemical Ecology Jena, Germany
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18
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Silbering AF, Bell R, Münch D, Cruchet S, Gomez-Diaz C, Laudes T, Galizia CG, Benton R. Ir40a neurons are not DEET detectors. Nature 2016; 534:E5-7. [PMID: 27337300 DOI: 10.1038/nature18321] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Accepted: 05/10/2016] [Indexed: 01/12/2023]
Affiliation(s)
- Ana F Silbering
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, Lausanne, CH-1015, Switzerland
| | - Rati Bell
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, Lausanne, CH-1015, Switzerland
| | - Daniel Münch
- Department of Biology, University of Konstanz, 78457, Konstanz, Germany
| | - Steeve Cruchet
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, Lausanne, CH-1015, Switzerland
| | - Carolina Gomez-Diaz
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, Lausanne, CH-1015, Switzerland
| | - Thomas Laudes
- Department of Biology, University of Konstanz, 78457, Konstanz, Germany
| | | | - Richard Benton
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, Lausanne, CH-1015, Switzerland
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19
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Bieber T, Akdis C, Lauener R, Traidl-Hoffmann C, Schmid-Grendelmeier P, Schäppi G, Allam JP, Apfelbacher C, Augustin M, Beck L, Biedermann T, Braun-Fahrländer C, Chew FT, Clavel T, Crameri R, Darsow U, Deleuran M, Dittlein D, Duchna HW, Eichenfeld L, Eyerich K, Frei R, Gelmetti C, Gieler U, Gilles S, Glatz M, Grando K, Green J, Gutermuth J, Guttman-Yassky E, Hanifin J, Hijnen D, Hoetzenecker W, Irvine A, Kalweit A, Katoh N, Knol E, Koren H, Möhrenschlager M, Münch D, Novak N, O'Mahony L, Paller AS, Rhyner C, Roduit C, Schiesser K, Schröder J, Simon D, Simon HU, Sokolowska M, Spuls P, Stalder JF, Straub D, Szalai Z, Taieb A, Takaoka R, Todd G, Todorova A, Vestergaard C, Werfel T, Wollenberg A, Ring J. Global Allergy Forum and 3rd Davos Declaration 2015: Atopic dermatitis/Eczema: challenges and opportunities toward precision medicine. Allergy 2016; 71:588-92. [PMID: 27023268 DOI: 10.1111/all.12857] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Abstract
Odors elicit complex patterns of activated olfactory sensory neurons. Knowing the complete olfactome, i.e. the responses in all sensory neurons for all relevant odorants, is desirable to understand olfactory coding. The DoOR project combines all available Drosophila odorant response data into a single consensus response matrix. Since its first release many studies were published: receptors were deorphanized and several response profiles were expanded. In this study, we add unpublished data to the odor-response profiles for four odorant receptors (Or10a, Or42b, Or47b, Or56a). We deorphanize Or69a, showing a broad response spectrum with the best ligands including 3-hydroxyhexanoate, alpha-terpineol, 3-octanol and linalool. We include all of these datasets into DoOR, provide a comprehensive update of both code and data, and new tools for data analyses and visualizations. The DoOR project has a web interface for quick queries (http://neuro.uni.kn/DoOR), and a downloadable, open source toolbox written in R, including all processed and original datasets. DoOR now gives reliable odorant-responses for nearly all Drosophila olfactory responding units, listing 693 odorants, for a total of 7381 data points.
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Affiliation(s)
- Daniel Münch
- Neurobiology, University of Konstanz, 78457 Konstanz, Germany
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21
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Rasmussen EMK, Vågbø CB, Münch D, Krokan HE, Klungland A, Amdam GV, Dahl JA. DNA base modifications in honey bee and fruit fly genomes suggest an active demethylation machinery with species- and tissue-specific turnover rates. Biochem Biophys Rep 2016; 6:9-15. [PMID: 28955859 PMCID: PMC5600429 DOI: 10.1016/j.bbrep.2016.02.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Revised: 02/15/2016] [Accepted: 02/19/2016] [Indexed: 12/19/2022] Open
Abstract
Well-known epigenetic DNA modifications in mammals include the addition of a methyl group and a hydroxyl group to cytosine, resulting in 5-methylcytosine (5mC) and 5-hydroxymethylcytosine (5hmC) respectively. In contrast, the abundance and the functional implications of these modifications in invertebrate model organisms such as the honey bee (Apis mellifera) and the fruit fly (Drosophila melanogaster) are not well understood. Here we show that both adult honey bees and fruit flies contain 5mC and also 5hmC. Using a highly sensitive liquid chromatography/tandem mass spectrometry (LC/MS/MS) technique, we quantified 5mC and 5hmC in different tissues of adult honey bee worker castes and in adult fruit flies. A comparison of our data with reports from human and mouse shed light on notable differences in 5mC and 5hmC levels between tissues and species. Reporting cytosine modifications in uncharacterized tissues, phenotypes and species. Quantification of 5mC and 5hmC suggests species-specific roles and turnover. Low levels of 5hmC relative to 5mC and cytosine in honey bees compared to mammals. Honey bee abdominal tissues are richer in5hmC than the brain. We found a higher 5hmC to 5mC ratio in fruit flies as compared to the honey bee.
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Affiliation(s)
- Erik M K Rasmussen
- Department of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, NO-1432 Aas, Norway
| | - Cathrine B Vågbø
- Department of Cancer Research and Molecular Medicine, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway
| | - Daniel Münch
- Department of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, NO-1432 Aas, Norway
| | - Hans E Krokan
- Department of Cancer Research and Molecular Medicine, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway
| | - Arne Klungland
- Department of Microbiology, Division of diagnostics and intervention, Institute of Clinical Medicine, Oslo University Hospital, Rikshospitalet, NO-0027 Oslo, Norway
| | - Gro V Amdam
- Department of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, NO-1432 Aas, Norway.,School of Life Sciences, Arizona State University, Tempe, AZ, USA
| | - John Arne Dahl
- Department of Microbiology, Division of diagnostics and intervention, Institute of Clinical Medicine, Oslo University Hospital, Rikshospitalet, NO-0027 Oslo, Norway
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22
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Speth MT, Kreibich CD, Amdam GV, Münch D. Aging- and task-related resilience decline is linked to food responsiveness in highly social honey bees. Exp Gerontol 2015; 65:46-52. [DOI: 10.1016/j.exger.2015.03.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Revised: 03/04/2015] [Accepted: 03/08/2015] [Indexed: 01/11/2023]
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23
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Boulanger J, Gueudry C, Münch D, Cinquin B, Paul-Gilloteaux P, Bardin S, Guérin C, Senger F, Blanchoin L, Salamero J. Fast high-resolution 3D total internal reflection fluorescence microscopy by incidence angle scanning and azimuthal averaging. Proc Natl Acad Sci U S A 2014; 111:17164-9. [PMID: 25404337 PMCID: PMC4260613 DOI: 10.1073/pnas.1414106111] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [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: 12/28/2022] Open
Abstract
Total internal reflection fluorescence microscopy (TIRFM) is the method of choice to visualize a variety of cellular processes in particular events localized near the plasma membrane of live adherent cells. This imaging technique not relying on particular fluorescent probes provides a high sectioning capability. It is, however, restricted to a single plane. We present here a method based on a versatile design enabling fast multiwavelength azimuthal averaging and incidence angles scanning to computationally reconstruct 3D images sequences. We achieve unprecedented 50-nm axial resolution over a range of 800 nm above the coverslip. We apply this imaging modality to obtain structural and dynamical information about 3D actin architectures. We also temporally decipher distinct Rab11a-dependent exocytosis events in 3D at a rate of seven stacks per second.
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Affiliation(s)
| | - Charles Gueudry
- Plateforme Imagerie Cellulaire et Tissulaire-Infrastructure en Biologie Santé et Agronomie Institut Curie, 75005 Paris, France; Roper Scientific SAS, 91017 Evry, France; and
| | - Daniel Münch
- Plateforme Imagerie Cellulaire et Tissulaire-Infrastructure en Biologie Santé et Agronomie Institut Curie, 75005 Paris, France; Roper Scientific SAS, 91017 Evry, France; and
| | | | - Perrine Paul-Gilloteaux
- UMR144 CNRS/Institut Curie, 75005 Paris, France; Plateforme Imagerie Cellulaire et Tissulaire-Infrastructure en Biologie Santé et Agronomie Institut Curie, 75005 Paris, France
| | | | - Christophe Guérin
- Institut de Recherches en Technologies et Sciences pour le Vivant, Laboratoire de Physiologie Cellulaire et Végétale, CNRS/Commissariat à l'Energie Atomique/Institut National de la Recherche Agronomique/Université Joseph Fourier, Grenoble 38054, France
| | - Fabrice Senger
- Institut de Recherches en Technologies et Sciences pour le Vivant, Laboratoire de Physiologie Cellulaire et Végétale, CNRS/Commissariat à l'Energie Atomique/Institut National de la Recherche Agronomique/Université Joseph Fourier, Grenoble 38054, France
| | - Laurent Blanchoin
- Institut de Recherches en Technologies et Sciences pour le Vivant, Laboratoire de Physiologie Cellulaire et Végétale, CNRS/Commissariat à l'Energie Atomique/Institut National de la Recherche Agronomique/Université Joseph Fourier, Grenoble 38054, France
| | - Jean Salamero
- UMR144 CNRS/Institut Curie, 75005 Paris, France; Plateforme Imagerie Cellulaire et Tissulaire-Infrastructure en Biologie Santé et Agronomie Institut Curie, 75005 Paris, France;
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24
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Strauch M, Lüdke A, Münch D, Laudes T, Galizia CG, Martinelli E, Lavra L, Paolesse R, Ulivieri A, Catini A, Capuano R, Di Natale C. More than apples and oranges--detecting cancer with a fruit fly's antenna. Sci Rep 2014; 4:3576. [PMID: 24389870 PMCID: PMC3880960 DOI: 10.1038/srep03576] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [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: 10/01/2013] [Accepted: 12/06/2013] [Indexed: 11/09/2022] Open
Abstract
Cancer cells and non-cancer cells differ in their metabolism and they emit distinct volatile compound profiles, allowing to recognise cancer cells by their scent. Insect odorant receptors are excellent chemosensors with high sensitivity and a broad receptive range unmatched by current gas sensors. We thus investigated the potential of utilising the fruit fly's olfactory system to detect cancer cells. Using in vivo calcium imaging, we recorded an array of olfactory receptor neurons on the fruit fly's antenna. We performed multidimensional analysis of antenna responses, finding that cell volatiles from different cell types lead to characteristic response vectors. The distances between these response vectors are conserved across flies and can be used to discriminate healthy mammary epithelial cells from different types of breast cancer cells. This may expand the repertoire of clinical diagnostics, and it is the first step towards electronic noses equipped with biological sensors, integrating artificial and biological olfaction.
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Affiliation(s)
- Martin Strauch
- 1] Neurobiology, University of Konstanz, Universitätsstraße 10, 78457 Konstanz, Germany [2]
| | - Alja Lüdke
- 1] Neurobiology, University of Konstanz, Universitätsstraße 10, 78457 Konstanz, Germany [2]
| | - Daniel Münch
- 1] Neurobiology, University of Konstanz, Universitätsstraße 10, 78457 Konstanz, Germany [2]
| | - Thomas Laudes
- Neurobiology, University of Konstanz, Universitätsstraße 10, 78457 Konstanz, Germany
| | - C Giovanni Galizia
- 1] Neurobiology, University of Konstanz, Universitätsstraße 10, 78457 Konstanz, Germany [2] Department of Electronic Engineering, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Roma, Italy
| | - Eugenio Martinelli
- Department of Electronic Engineering, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Roma, Italy
| | - Luca Lavra
- Department of Clinical and Molecular Medicine, University of Rome La Sapienza, Via di Grottarossa 1035, 00189 Roma, Italy
| | - Roberto Paolesse
- Department of Chemistry, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133 Roma, Italy
| | - Alessandra Ulivieri
- Department of Electronic Engineering, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Roma, Italy
| | - Alexandro Catini
- Department of Electronic Engineering, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Roma, Italy
| | - Rosamaria Capuano
- Department of Electronic Engineering, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Roma, Italy
| | - Corrado Di Natale
- Department of Electronic Engineering, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Roma, Italy
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25
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Strauch M, Müthing C, Broeg MP, Szyszka P, Münch D, Laudes T, Deussen O, Galizia CG, Merhof D. The looks of an odour--visualising neural odour response patterns in real time. BMC Bioinformatics 2013; 14 Suppl 19:S6. [PMID: 24564474 PMCID: PMC3980292 DOI: 10.1186/1471-2105-14-s19-s6] [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] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Calcium imaging in insects reveals the neural response to odours, both at the receptor level on the antenna and in the antennal lobe, the first stage of olfactory information processing in the brain. Changes of intracellular calcium concentration in response to odour presentations can be observed by employing calcium-sensitive, fluorescent dyes. The response pattern across all recorded units is characteristic for the odour. METHOD Previously, extraction of odour response patterns from calcium imaging movies was performed offline, after the experiment. We developed software to extract and to visualise odour response patterns in real time. An adaptive algorithm in combination with an implementation for the graphics processing unit enables fast processing of movie streams. Relying on correlations between pixels in the temporal domain, the calcium imaging movie can be segmented into regions that correspond to the neural units. RESULTS We applied our software to calcium imaging data recorded from the antennal lobe of the honeybee Apis mellifera and from the antenna of the fruit fly Drosophila melanogaster. Evaluation on reference data showed results comparable to those obtained by previous offline methods while computation time was significantly lower. Demonstrating practical applicability, we employed the software in a real-time experiment, performing segmentation of glomeruli--the functional units of the honeybee antennal lobe--and visualisation of glomerular activity patterns. CONCLUSIONS Real-time visualisation of odour response patterns expands the experimental repertoire targeted at understanding information processing in the honeybee antennal lobe. In interactive experiments, glomeruli can be selected for manipulation based on their present or past activity, or based on their anatomical position. Apart from supporting neurobiology, the software allows for utilising the insect antenna as a chemosensor, e.g. to detect or to classify odours.
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Affiliation(s)
- Martin Strauch
- Interdisciplinary Center for Interactive Data Analysis, Modelling and Visual Exploration (INCIDE), University of Konstanz, 78457 Konstanz, Germany
- Neurobiology, University of Konstanz, 78457 Konstanz, Germany
| | - Clemens Müthing
- Interdisciplinary Center for Interactive Data Analysis, Modelling and Visual Exploration (INCIDE), University of Konstanz, 78457 Konstanz, Germany
| | - Marc P Broeg
- Interdisciplinary Center for Interactive Data Analysis, Modelling and Visual Exploration (INCIDE), University of Konstanz, 78457 Konstanz, Germany
| | - Paul Szyszka
- Neurobiology, University of Konstanz, 78457 Konstanz, Germany
| | - Daniel Münch
- Neurobiology, University of Konstanz, 78457 Konstanz, Germany
| | - Thomas Laudes
- Neurobiology, University of Konstanz, 78457 Konstanz, Germany
| | - Oliver Deussen
- Interdisciplinary Center for Interactive Data Analysis, Modelling and Visual Exploration (INCIDE), University of Konstanz, 78457 Konstanz, Germany
| | | | - Dorit Merhof
- Interdisciplinary Center for Interactive Data Analysis, Modelling and Visual Exploration (INCIDE), University of Konstanz, 78457 Konstanz, Germany
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Abstract
Highly social animals provide alternative aging models in which vastly different lifespan patterns are flexible, and linked to social caste. Research in these species aims to reveal how environment, including social cues, can shape the transition between short-lived and extremely long-lived phenotypes with negligible senescence. Among honey bee workers, short to intermediate lifespans are typical for summer castes, while the winter caste can live up to 10 times longer. For summer castes, experimental interventions could predictably accelerate, slow or revert functional senescence. In contrast, little is known about the partic ular conditions under which periods of negligible senescence in winter castes can be disrupted or sustained. We asked how manipulation of social environment in colonies with long-lived winter bees might alter the pace of functional senescence, measured as learning performance, as well as of cellular senescence, measured as lipofuscin accumulation. We show that behavioral senescence becomes rapidly detectable when the winter state is disrupted, and changes in social task behaviors and social environment (brood) are induced. Likewise, we found that cellular senescence was induced by such social intervention. However, cellular senescence showed marked regional differences, suggesting that particular brain regions age slower than others. Finally, by preventing post-winter colonies from brood rearing, behavioral senescence became undetectable, even after transition to the usually short-lived phenotypes had occurred. We envision that social regulation of negligible functional senescence and highly dynamic accumulation of a universal symptom of cellular aging (lipofuscin) offers rewarding perspectives to target proximate mechanisms of slowed aging.
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Affiliation(s)
- Daniel Münch
- Department of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, 1432 Ås, Norway.
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Münch D, Baker N, Rasmussen EMK, Shah AK, Kreibich CD, Heidem LE, Amdam GV. Obtaining specimens with slowed, accelerated and reversed aging in the honey bee model. J Vis Exp 2013. [PMID: 24022601 DOI: 10.3791/50550] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Societies of highly social animals feature vast lifespan differences between closely related individuals. Among social insects, the honey bee is the best established model to study how plasticity in lifespan and aging is explained by social factors. The worker caste of honey bees includes nurse bees, which tend the brood, and forager bees, which collect nectar and pollen. Previous work has shown that brain functions and flight performance senesce more rapidly in foragers than in nurses. However, brain functions can recover, when foragers revert back to nursing tasks. Such patterns of accelerated and reversed functional senescence are linked to changed metabolic resource levels, to alterations in protein abundance and to immune function. Vitellogenin, a yolk protein with adapted functions in hormonal control and cellular defense, may serve as a major regulatory element in a network that controls the different aging dynamics in workers. Here we describe how the emergence of nurses and foragers can be monitored, and manipulated, including the reversal from typically short-lived foragers into longer-lived nurses. Our representative results show how individuals with similar chronological age differentiate into foragers and nurse bees under experimental conditions. We exemplify how behavioral reversal from foragers back to nurses can be validated. Last, we show how different cellular senescence can be assessed by measuring the accumulation of lipofuscin, a universal biomarker of senescence. For studying mechanisms that may link social influences and aging plasticity, this protocol provides a standardized tool set to acquire relevant sample material, and to improve data comparability among future studies.
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Affiliation(s)
- Daniel Münch
- Department of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences
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Havukainen H, Münch D, Baumann A, Zhong S, Halskau Ø, Krogsgaard M, Amdam GV. Vitellogenin recognizes cell damage through membrane binding and shields living cells from reactive oxygen species. J Biol Chem 2013; 288:28369-81. [PMID: 23897804 DOI: 10.1074/jbc.m113.465021] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Large lipid transfer proteins are involved in lipid transportation and diverse other molecular processes. These serum proteins include vitellogenins, which are egg yolk precursors and pathogen pattern recognition receptors, and apolipoprotein B, which is an anti-inflammatory cholesterol carrier. In the honey bee, vitellogenin acts as an antioxidant, and elevated vitellogenin titer is linked to prolonged life span in this animal. Here, we show that vitellogenin has cell and membrane binding activity and that it binds preferentially to dead and damaged cells. Vitellogenin binds directly to phosphatidylcholine liposomes and with higher affinity to liposomes containing phosphatidylserine, a lipid of the inner leaflet of cell membranes that is exposed in damaged cells. Vitellogenin binding to live cells, furthermore, improves cell oxidative stress tolerance. This study can shed more light on why large lipid transfer proteins have a well conserved α-helical domain, because we locate the lipid bilayer-binding ability of vitellogenin largely to this region. We suggest that recognition of cell damage and oxidation shield properties are two mechanisms that allow vitellogenin to extend honey bee life span.
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Affiliation(s)
- Heli Havukainen
- From the Department of Chemistry, Biotechnology, and Food Science, Norwegian University of Life Sciences, 1432 Aas, Norway
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Affiliation(s)
- D. Münch
- Chirurgische Praxis, Liposuction.ch, Wiedlisbach/Bern, Schweiz
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30
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Abstract
Most odors in natural environments are mixtures of several compounds. Perceptually, these can blend into a new "perfume," or some components may dominate as elements of the mixture. In order to understand such mixture interactions, it is necessary to study the events at the olfactory periphery, down to the level of single-odorant receptor cells. Does a strong ligand present at a low concentration outweigh the effect of weak ligands present at high concentrations? We used the fruit fly receptor dOr22a and a banana-like odor mixture as a model system. We show that an intermediate ligand at an intermediate concentration alone elicits the neuron's blend response, despite the presence of both weaker ligands at higher concentration, and of better ligands at lower concentration in the mixture. Because all of these components, when given alone, elicited significant responses, this reveals specific mixture processing already at the periphery. By measuring complete dose-response curves we show that these mixture effects can be fully explained by a model of syntopic interaction at a single-receptor binding site. Our data have important implications for how odor mixtures are processed in general, and what preprocessing occurs before the information reaches the brain.
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Affiliation(s)
- Daniel Münch
- Neurobiology, University of Konstanz, D-78457 Konstanz, Germany.
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Münch D, Baker N, Kreibich CD, Bråten AT, Amdam GV. In the laboratory and during free-flight: old honey bees reveal learning and extinction deficits that mirror mammalian functional decline. PLoS One 2010; 5:e13504. [PMID: 20976061 PMCID: PMC2957435 DOI: 10.1371/journal.pone.0013504] [Citation(s) in RCA: 14] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2009] [Accepted: 09/22/2010] [Indexed: 12/22/2022] Open
Abstract
Loss of brain function is one of the most negative and feared aspects of aging. Studies of invertebrates have taught us much about the physiology of aging and how this progression may be slowed. Yet, how aging affects complex brain functions, e.g., the ability to acquire new memory when previous experience is no longer valid, is an almost exclusive question of studies in humans and mammalian models. In these systems, age related cognitive disorders are assessed through composite paradigms that test different performance tasks in the same individual. Such studies could demonstrate that afflicted individuals show the loss of several and often-diverse memory faculties, and that performance usually varies more between aged individuals, as compared to conspecifics from younger groups. No comparable composite surveying approaches are established yet for invertebrate models in aging research. Here we test whether an insect can share patterns of decline similar to those that are commonly observed during mammalian brain aging. Using honey bees, we combine restrained learning with free-flight assays. We demonstrate that reduced olfactory learning performance correlates with a reduced ability to extinguish the spatial memory of an abandoned nest location (spatial memory extinction). Adding to this, we show that learning performance is more variable in old honey bees. Taken together, our findings point to generic features of brain aging and provide the prerequisites to model individual aspects of learning dysfunction with insect models.
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Affiliation(s)
- Daniel Münch
- Department of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, Aas, Norway.
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Münch D, Ott SR, Pflüger HJ. Three-dimensional distribution of no sources in a primary mechanosensory integration center in the locust and its implications for volume signaling. J Comp Neurol 2010. [DOI: 10.1002/cne.22438] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Galizia CG, Münch D, Strauch M, Nissler A, Ma S. Integrating heterogeneous odor response data into a common response model: A DoOR to the complete olfactome. Chem Senses 2010; 35:551-63. [PMID: 20530377 PMCID: PMC2924422 DOI: 10.1093/chemse/bjq042] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [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] [Indexed: 01/28/2023] Open
Abstract
We have developed a new computational framework for merging odor response data sets from heterogeneous studies, creating a consensus metadatabase, the database of odor responses (DoOR). As a result, we obtained a functional atlas of all available odor responses in Drosophila melanogaster. Both the program and the data set are freely accessible and downloadable on the Internet (http://neuro.uni-konstanz.de/DoOR). The procedure can be adapted to other species, thus creating a family of “olfactomes” in the near future. Drosophila melanogaster was chosen because of all species this one is closest to having the complete olfactome characterized, with the highest number of deorphanized receptors available. The database guarantees long-term stability (by offering time-stamped, downloadable versions), up-to-date accuracy (by including new data sets as soon as they are published), and portability (for other species). We hope that this comprehensive repository of odor response profiles will be useful to the olfactory community and to computational neuroscientists alike.
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Affiliation(s)
- C Giovanni Galizia
- Department of Neurobiology, University of Konstanz, 78457 Konstanz, Germany.
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Münch D, Ott SR, Pflüger HJ. Three-dimensional distribution of NO sources in a primary mechanosensory integration center in the locust and its implications for volume signaling. J Comp Neurol 2010; 518:2903-16. [DOI: 10.1002/cne.22396] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Abstract
Among insects, learning is particularly well studied in the fruit fly Drosophila melanogaster and the honeybee Apis mellifera. A senescence-dependent decline in classic pavlovian conditioning is demonstrated for both species. To understand how aging affects learning, genetic approaches used with Drosophila can benefit from complementary studies in Apis. Specifically, honeybees have a larger brain size allowing for compartment-specific approaches, and a unique life-history plasticity. They usually perform within-nest tasks early in life (nest bees) and later they collect food (foragers). Senescence of learning performance is a function of the bees' foraging duration but underlying causes are poorly understood. As cognitive aging is commonly associated with structural and biochemical changes in the brain, we hypothesized that brain areas implicated in learning change in synaptic and biochemical composition with increased foraging duration. First, we used synapse-specific immunohistochemistry and proteomics to screen for alterations in the calyx region of the mushroom body, a key structure for memory formation. Using proteomics, we next profiled the central brain, which comprises all higher-order integration centers. We show that, with increased foraging duration, levels of kinases, synaptic- and neuronal growth-related proteins decline in the central brain while the calyx region remains intact both in structure and biochemistry. We suggest that proteome-level changes within major anatomical sites of memory formation other than the calyx region could be central to learning dysfunction. These include large compartments of the central brain, such as the mushroom body's output regions and the antennal lobes. Our data provide novel information toward heterogeneity in the aging insect brain, and demonstrate advantages of the honeybee for invertebrate neurogerontological research.
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Affiliation(s)
- F Wolschin
- Department of Chemistry, Biotechnology and Food Science, University of Life Sciences, N-1432 As, Norway.
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Abstract
Commonly held views assume that ageing, or senescence, represents an inevitable, passive, and random decline in function that is strongly linked to chronological age. In recent years, genetic intervention of life span regulating pathways, for example, in Drosophila as well as case studies in non-classical animal models, have provided compelling evidence to challenge these views.Rather than comprehensively revisiting studies on the established genetic model systems of ageing, we here focus on an alternative model organism with a wild type (unselected genotype) characterized by a unique diversity in longevity - the honey bee.Honey bee (Apis mellifera) life span varies from a few weeks to more than 2 years. This plasticity is largely controlled by environmental factors. Thereby, although individuals are closely related genetically, distinct life histories can emerge as a function of social environmental change.Another remarkable feature of the honey bee is the occurrence of reverted behavioural ontogeny in the worker (female helper) caste. This behavioural peculiarity is associated with alterations in somatic maintenance functions that are indicative of reverted senescence. Thus, although intraspecific variation in organismal life span is not uncommon, the honey bee holds great promise for gaining insights into regulatory pathways that can shape the time-course of ageing by delaying, halting or even reversing processes of senescence. These aspects provide the setting of our review.We will highlight comparative findings from Drosophila melanogaster and Caenorhabditis elegans in particular, and focus on knowledge spanning from molecular- to behavioural-senescence to elucidate how the honey bee can contribute to novel insights into regulatory mechanisms that underlie plasticity and robustness or irreversibility in ageing.
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Affiliation(s)
- D Münch
- Department of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, P.O. Box 5003, N-1432 Aas, Norway
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Akdis M, Trautmann A, Klunker S, Daigle I, Kücüksezer UC, Deglmann W, Disch R, Blaser K, Akdis CA, Forschner K, Zuberbier T, Worm M, Gutermuth J, Huss-Marp J, Eberlein-König B, Breuer K, Mair S, Darsow U, Ansel A, Krämer U, Mayer E, Gertis K, Ring J, Behrendt H, Jappe U, Farrar M, Ingham E, Holland K, Karamloo F, Schmid-Grendelmeier P, Kussebi F, Manhart C, Soldatova L, Hously-Markovic Z, Spangfort MD, Kunzmann S, Schmidt-Weber CB, Mahler V, Gutgesell C, Fuchs T, Kraft D, Valenta R, Münch D, Borelli S, Fukrop R, Reese I, Hipler UC, Weissenbacher S, Engst R, Rakoski J, Ollert M, Wilkening R, Soost S, Klinger R, Wuske T. Poster-Abstracts. Allergo J 2002. [DOI: 10.1007/bf03361028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Münch D, Altmann E. [Initial manifestation of thromboangiitis obliterans as necrotizing colitis]. VASA 2001; 30:289-92. [PMID: 11771215 DOI: 10.1024/0301-1526.30.4.289] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Necrotizing colitis as primary manifestation of Buerger's disease. We report the disease process of a 41 year old woman, who was referred to our clinic with intermittent claudication of the leg. She has been an excessive smoker since early youth. Three years ago a hemicolectomy was carried out because of a necrotizing colitis. The clinical, angiographic and histologic findings are presented. Finally the frequency of intestinal Buerger's disease and the types of clinical course are discussed.
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Affiliation(s)
- D Münch
- Abteilung für Angiologie, II. Medizinische Klinik, Krankenhaus Dresden-Friedrichstadt, Dresden.
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40
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Affiliation(s)
- P J Fonseca
- Departamento Zoologia and Centro de Biologia Ambiental, Faculdade Ciências Lisboa, Portugal
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Studer UE, Münch D. [Hormonal therapy (medical orchiectomy) in prostatic carcinoma]. Schweiz Med Wochenschr 1990; 120:881-7. [PMID: 2193381] [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: 12/30/2022]
Abstract
Hormonal therapy of prostate cancer is still the most effective systemic treatment. Possible alternatives to subcapsular orchiectomy are discussed, comprising the estrogens with their known cardiovascular side effects, the expensive LH-RH analogues, and/or the antiandrogens, which depend on the patient's compliance. Due to more intensive health care and more sensitive diagnostic methods, there is now an increase not only in the overall number of diagnosed prostate carcinomas, but also in the percentage of those which do not need treatment. The question when, and in which patient hormonal treatment should be started becomes increasingly important.
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Affiliation(s)
- U E Studer
- Urologische Universitätsklinik, Inselspital, Bern
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Münch D, Schröder R. [Migration of an Angelchik antireflux prosthesis in the gastrointestinal tract with ileus of the small intestine]. Chirurg 1986; 57:812-4. [PMID: 3545710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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