Scientists at the Helmholtz Zentrum München have developed a new mass spectrometry imaging method which, for the first time, makes it possible to analyze hundreds of metabolites in fixed tissue samples. Their findings, published in the journal Nature Protocols, explain the new access to metabolic information, which will offer previously unexploited potential for tissue-based research and molecular diagnostics.
In biomedical research, working with tissue samples is indispensable because it permits insights into the biological reality of patients, for example, in addition to those gained from Petri dishes and computer simulations. The tissue is usually fixed in formalin and embedded in paraffin wax in order to keep the tissue, as far as possible, in its original condition for later analyses.
It was previously assumed that in material that had been treated in this way an analysis of metabolites, in contrast to DNA or proteins, would be barely possible for technical reasons. A team of scientists from the Analytical Pathology department at the Helmholtz Zentrum München led by Prof. Axel Karl Walch has now succeeded in refuting this belief.
Fixed tissues accessible on a large scale
The researchers developed a protocol which makes it possible – within one day – to determine the metabolite composition of tissues using a mass spectrometry imaging approach, and to make it visible in tissue sections. Relatively small amounts of material are required for this, according to the authors. “Our method permits the analysis of minute biopsies and even tissue micro-arrays, making it particularly interesting for molecular research and diagnostics,” explains doctoral candidate Achim Buck, together with Alice Ly, the first author of the study.
In order to ensure that the measured data was not falsified by the fixation process, the authors compared it with the measured values for the same samples that were not fixed but were shock frozen. “A large proportion of the measured metabolites occurred in both analyses,” reports Achim Buck. “We were able to show that the method works reliably and avoids the complex logistics and storage of shock-frozen samples.”
In addition to simple handling and high reproducibility, the possibility to conduct high throughput work is a key advantage of the new method*, according to the scientists. Above all, however, it is now possible to study the spatial distribution of molecules in the tissue graphically and with great precision. “That is an enormous advantage, both in research and in clinical diagnostic practice,” research team leader Walch says, assessing the new possibilities. “Using our new analytical method, our aim is now to identify new predictive, diagnostic and prognostic markers in tissues, as well as to understand disease processes.”
The scientists hope that publication of the protocol will also lead to an exchange with and further developments by colleagues with a view to advancing metabolic analyses of archived tissues.
* Via tissue microarrays, which permit the analysis of several hundred patients in one measurement, tissue-based scientific and diagnostic questions relating to the pathogenesis of diseases and new treatment options can be clarified on a high throughput basis.
Ly, A. & Buck, A. et al. (2016). High Mass Resolution MALDI Mass Spectrometry Imaging of Metabolites from Formalin-Fixed Paraffin Embedded Tissue, Nature Protocols, DOI: nprot.2016.081
Buck, A. & Ly, A. et al. (2015). High-resolution MALDI-FT-ICR MS Imaging for the analysis of metabolites from formalin-fixed paraffin-embedded clinical tissue samples, The Journal of Pathology, doi:10.1002/path.4560
The Helmholtz Zentrum München, the German Research Center for Environmental Health, pursues the goal of developing personalized medical approaches for the prevention and therapy of major common diseases such as diabetes and lung diseases. To achieve this, it investigates the interaction of genetics, environmental factors and lifestyle. The Helmholtz Zentrum München is headquartered in Neuherberg in the north of Munich and has about 2,300 staff members. It is a member of the Helmholtz Association, a community of 18 scientific-technical and medical-biological research centers with a total of about 37,000 staff members. http://www.helmholtz-muenchen.de/en
The Analytical Pathology Department (AAP) carries out scientific development, as a complement to research units with a clinical and fundamental orientation, of translational research on diseases that occur in tissue. AAP is involved in the translation of (for example) in-vitro models or animal models to application in humans. AAP thus links, in collaboration with the Institute for Pathology (PATH), basic research with diagnostic application, subsequently translating the findings of experimental and molecular pathology into procedures for the classification of diseases and predictive diagnostics dealing with tissue. http://www.helmholtz-muenchen.de/aap
Contact for the media:
Department of Communication, Helmholtz Zentrum München - German Research Center for Environmental Health, Ingolstädter Landstr. 1, 85764 Neuherberg - Tel. +49 89 3187 2238 - Fax: +49 89 3187 3324 - E-mail: email@example.com
Scientific Contact at Helmholtz Zentrum München:
Prof. Dr. Axel Karl Walch, Helmholtz Zentrum München - German Research Center for Environmental Health, Analytical Pathology Department, Ingolstädter Landstr. 1, 85764 Neuherberg - Tel. +49 89 3187 2739, E-mail: firstname.lastname@example.org
Sonja Opitz | Helmholtz Zentrum München - Deutsches Forschungszentrum für Gesundheit und Umwelt
Cryo-electron microscopy achieves unprecedented resolution using new computational methods
24.03.2017 | DOE/Lawrence Berkeley National Laboratory
How cheetahs stay fit and healthy
24.03.2017 | Forschungsverbund Berlin e.V.
Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...
Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.
Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...
In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...
20.03.2017 | Event News
14.03.2017 | Event News
07.03.2017 | Event News
24.03.2017 | Materials Sciences
24.03.2017 | Physics and Astronomy
24.03.2017 | Physics and Astronomy