Steffen Tiedt – Molecular Biomarkers – From Omics to Mechanisms
We aim to identify circulating signatures that inform on the local and systemic effects of stroke and to explore the underlying molecular and pathophysiological mechanisms. Events in most organs including the local and systemic events (e.g. stress) related to acute stroke are captured by the circulating proteome and metabolome. In a bedside-to-bench-approach we apply profiling technologies on human samples to identify differentially regulated molecules and study their functional role in vitro and in vivo using experimental stroke models, transgenic animal models, different imaging modalities, and a broad range of biomolecular tools.
Our work is motivated by the heterogeneity of ischemic stroke, which poses a challenge for assigning patients to optimal treatment strategies and is a major reason for the large number of failed clinical trials. Current diagnostic algorithms are insufficient to capture both the mechanisms leading to and following stroke. The number of circulating proteins (3.500) and metabolites (25.000) exceeds the number of proteins and metabolites currently assessed in clinical practice (≈ 20) by several orders of magnitude thus illustrating the potential of profiling studies to inform beyond established diagnostic algorithms. Our ultimate goal is to implement meaningful circulating biomarkers in clinical stroke care.
To achieve this, we have recruited more than 2,000 patients with acute stroke or stroke-like diseases into our CIRCULAting biomarkers after Stroke (CIRCULAS) study, which focuses on early and serial biosampling in the acute phase of stroke. In a precision medicine approach combining deep clinical phenotyping with profiling technologies such as RNA sequencing, proteomics, and metabolomics as well as ultrasensitive single-molecule and point-of-care technologies we have identified novel markers for stroke on different molecular levels.
Contact: Steffen Tiedt, MD PhD
Publications by Steffen Tiedt
Schwedhelm E, Tiedt S, Lezius S, Wölfer TA, Jensen M, Schulz R, Böger R, Gerloff C, Thomalla G, Choe CU. Effective high-density lipoprotein cholesterol is associated with carotid intima-media thickness and vascular events after acute ischemic stroke. Atherosclerosis. 2022 Sep;357:9-13. doi: 10.1016/j.atherosclerosis.2022.08.001. Epub 2022 Aug 7.
Quandt F, Flottmann F, Madai VI, Alegiani A, Küpper C, Kellert L, Hilbert A, Frey D, Liebig T, Fiehler J, Goyal M, Saver JL, Gerloff C, Thomalla G, Tiedt S; GSR investigators and the VISTA-Endovascular Collaborators. Machine Learning-Based Identification of Target Groups for Thrombectomy in Acute Stroke. Transl Stroke Res. 2022 Jun 7. doi: 10.1007/s12975-022-01040-5. Epub ahead of print. PMID: 35670996.
Reidler P, Brehm A, Sporns PB, Burbano VG, Stueckelschweiger L, Broocks G, Liebig T, Psychogios MN, Ricke J, Dimitriadis K, Dichgans M, Kunz WG, Tiedt S. Circadian rhythm of ischaemic core progression in human stroke. J Neurol Neurosurg Psychiatry. 2021 May 26:jnnp-2021-326072. doi: 10.1136/jnnp-2021-326072. Epub ahead of print.
Tiedt S, Brandmaier S, Kollmeier H, Duering M, Artati A, Adamski J, Klein M, Liebig T, Holdt LM, Teupser D, Wang-Sattler R, Schwedhelm E, Gieger C, Dichgans M. Circulating Metabolites Differentiate Acute Ischemic Stroke from Stroke Mimics. Ann Neurol. 2020 Oct;88(4):736-746. doi: 10.1002/ana.25859. Epub 2020 Aug 29. PMID: 32748431.
Tiedt S*, Duering M*, Barro C, Kaya AG, Boeck J, Bode FJ, Klein M, Dorn F, Gesierich B, Kellert L, Ertl-Wagner B, Goertler MW, Petzold GC, Kuhle J, Wollenweber FA, Peters N, Dichgans M. Serum Neurofilament Light: A Biomarker of Neuroaxonal Injury after Ischemic Stroke. Neurology. 2018 Oct 2;91(14):e1338-e1347. *Equally contributed.
Tiedt S, Prestel M, Malik R, Schieferdecker N, Duering M, Kautzky V, Stoycheva I, Böck J, Northoff BH, Klein M, Dorn F, Krohn K, Teupser D, Liesz A, Plesnila N, Holdt LM, Dichgans M. RNA-Seq Identifies Circulating miR-125a-5p, miR-125b-5p, and miR-143-3p as Potential Biomarkers for Acute Ischemic Stroke. Circ Res. 2017 Sep 29;121(8):970-980.
Vanessa Granja Burbano, PhD student
Originally from Ecuador, I obtained my BSc degree in Biology at Cayetano Heredia University in Peru and worked as a research assistant at the Department of Neurobiology, Genetics and Biochemistry. In 2016, I moved to Germany to pursue a MSc degree in Experimental and Clinical Neuroscience at the University of Regensburg. My master thesis was focused on the analysis of mitochondrial dysfunction in induced neurons obtained from patients with Major Depressive Disorder. Obtaining a DAAD scholarship from the iPUR program, I was able to work at the University of Regensburg as guest researcher with Dr. Oliver Bosch. My main research interests include neurodegenerative, cardiovascular, and age-related diseases. I have joined the Tiedt Lab at the ISD in 2020 as a PhD student at the Graduate School of Systemic Neurosciences (GSN). Primary focus of my work is to investigate the impact of the circadian rhythm on stroke. Outside the lab, I enjoy dancing salsa, reading tons of books and hiking.
Teresa Wölfer, MD student
Originally coming from Berlin I moved to Munich to start my medical studies in 2016. Very soon I developed a strong interest in Neurology which led me to pursue an experimental MD thesis at the Tiedt Lab at ISD to really get a deeper understanding of stroke research. While focusing my work on circulating biomarkers of ischemic stroke, I strive to gain insight into the methods and workflow of neuroscience research. Also having a keen interest in History and Philosophy I began my bachelor studies at the LMU in 2019. Outside the lab I like to visit the Alps (a new passion of mine), enjoy making some pottery or ride my bike through Munich’s parks.
Melanie Kaufmann, MD student
I am originally from a rural region in the east of Bavaria and I came to Munich a few years before I started my medical studies in 2015 to do an apprenticeship in the medical field. Therefore, in addition to my studies, I am already working in the clinical area in an intensive care unit in nursing and so I can already gain initial experience in patient care.The complex mechanisms of the human body have always fascinated and inspired me. However also the topicality and relevance of neurovascular diseases have motivated me coming to the ISD in August 2020 to deal more intensively with stroke in particular. When I'm not working or studying, I spend a lot of time in my home community doing various voluntary activities or I‘m hiking, cycling or climbing in the mountains.
Michael Karg, MD student
Born and raised in Munich I am, as we say, a “Münchner Kindl”. After I passed my A-levels in 2016, I started my medical studies at the LMU in Munich in the following semester (16/17). Since 2018 I am glad to call Dr. Konstantinos Dimitriadis (senior physician in neurology at LMU) my mentor. I am very thankful for the mentorship, which allowed me to gain a deeper understanding in the field of neurology and the scientific research which is done at the ISD. In October 2018, I started my own research under the leadership of Dr. Steffen Tiedt. My subject is the the prevalence of systemic complications and prediction of thrombectomy success, interventional complications, and functional outcome after thrombectomy. Besides from my passion for medicine and its research, I am a big fan of intercultural exchanges in Europe and the whole world, which is why I speak four languages and of course I support the world’s best soccer club FC Bayern München.
Charlotte Forster, MD student
I grew up in a town near Cologne and moved to Munich in 2017 when I started studying medicine at the Ludwig-Maximilians-University. In February 2021 I became part of the TiedtLab as an MD student, being grateful for the combination of not only contributing to research specifically focusing on stroke but at the same time gaining insight into clinical practice in the field of neurology every day. In my spare time my love for music, literature and long hikes (preferably with one of my dogs) keeps me busy.
After training as a lab technician at the Max Planck Institute of Biochemistry I worked in the lab of Marc Schmidt-Supprian, first at the MPI and then at Klinikum rechts der Isar. 12 years later it was time to do something different and I am very happy to be able to join the Tiedt lab. I will be taking care of general organisation and supporting the scientists wherever I can. In my free time I like to read, play with my cats and go on long walks.
After working in nursing for a year, I started my medical studies in 2017 at LMU. Throughout my studies I continued to work in elderly care, where the relevance of neurological diseases became quite clear. Early 2022 I joined AG Tiedt and I am very happy to be able to contribute to the neuroscientific research. In my free time I enjoy climbing and horse riding.
Originally coming from Henan province of China, I started my medical studies in 2012. And in 2021, I finished my master’s degree with the thesis ’Dynamic changes of inflammatory CD4+T cytokines in patients with acute ischemic stroke’. I have already worked in neurology department as a resident doctor for one year, and with the understanding of ischemic stroke, I found I have a great passion for biomarkers of ischemic stroke. I am so lucky to be one of the members at Tiedt Lab to further explore the mechanism of biomarkers of ischemic stroke. Outside the lab, I like hiking and yoga most. But recently I am trying to learn to dance Jazz.
With a fascination for the (dys)functioning of the brain, I obtained my Master’s degree in Neuroscience and Cognition at Utrecht University. Following my graduation in 2017 I pursued my PhD under supervision of Prof. Dr. Geert Jan Biessels at the University Medical Center Utrecht. My PhD focused on the microstructural integrity of the white matter in Alzheimer’s disease and small vessel disease with the goal to better understand brain injury and cognitive decline in these conditions. During my PhD I got interested by systemic effects of brain injury and I am therefore happy to have joined the Tiedt lab in September 2022 as a Postdoc. Here I will study metabolomic changes after stroke. Outside of work I enjoy taking long walks on the beach, reading books and to meet family and friends.
Originally from Iran, I earned my bachelor's and master's degrees in biotechnology and medical biotechnology, respectively. While pursuing my master's degree, I became increasingly absorbed in the field of systems biology as well as the analysis of big data, which led me to implement proteomics data analysis in my master's thesis on kidney illness. I joined the Tiedt lab in September 2022 to follow up on my Ph.D. In this journey, I will focus on deciphering the underlying mechanisms of thrombus propagation via Proteome profiling with a holistic insight. Traveling, listening to music, and playing sports are some of the things I enjoy outside of the lab.
Shoshannah Amsellem, MD Student
Originally from France, I moved to Germany in 2014 and started to study medicine at the Ludwig-Maximilians-University in Munich in 2017. I have always been interested in the complex functioning of the human body and have developed an interest in Neuroscience throughout my studies. In August 2022 I joined the AG Tiedt as an MD Student and I am grateful to be able to contribute to the stroke research. During my free time outside of the ISD I enjoy singing, playing guitar and reading.
Orsalia-Zoi Veloudiou, MD Student
During my studies at the School of Medicine in Athens, Greece I developed a connection to patient brain pathology and interdisciplinary collaboration. In 2021, I completed a practical-year exchange at the LMU Klinikum and after my graduation in Greece, I moved back to Munich to chart a path that bridges clinical neurology with biomedical neuroscience. Inspired by the concept of circadian rhythm dysregulation, I joined the Tiedt lab in March 2023 to conduct an MD thesis on the role of the core circadian clock genes in the progression of ischemic stroke both at a clinical and experimental level. Except for the lab work, I’m also excited to discover the hidden gems in Munich.
Walter Viegener, Master Student
I obtained my BSc degree in Biology and currently finish my MSc in Biochemistry at the LMU. My interests in computer science and bioinformatics grew during my master’s studies. After developing a tool for the proteomic data analysis program Perseus, I joined the Tiedt lab for my master thesis. During this project, I will focus on developing a machine learning approach that predicts the cellular composition of stroke thrombi. Outside of the lab, I enjoy swimming and climbing.
Eunice Holbura, MD Student
I am originally from Austria and moved to Munich for my medical studies at the LMU in 2019. I’ve always had a great interest in the human body and its complexity. In February 2023 I joined AG Tiedt, which not only enables me to get a greater insight in the field of Neuroscience, but also allows me to gain experience in the clinical part of stroke research. In my free time I enjoy swimming and drawing.
Nicolo Knuth, MD Student
My scientific goal is to identify meaningful circulating signatures that inform on pathophysiological mechanisms after stroke and can be utilized as diagnostic instruments. Implementing these in clinical routine I envision stroke care to be more comprehensive and precise.
I studied medicine at LMU and Harvard. Intrigued by courses on neurophysiology, I conducted my MD thesis with Magdalena Götz exploring the role of STAT-signaling on the neurogenic potential of reactive astrocytes. In 2013, I joined the group of Martin Dichgans at the ISD as a clinician-scientist conducting a joint program: a PhD in Neuroscience at the Graduate School of Systemic Neuroscience and residency in Clinical Neurology. During my PhD I initiated the CIRCULAting biomarkers after Stroke (CIRCULAS) study, which by now is the largest study world-wide with early and serial blood sampling in acute stroke patients (N>2,000). Utilizing this resource, we were the first to employ RNA sequencing for the identification of circulating miRNAs associated with stroke and to apply single-molecule array (SimoaTM) technology during the course of stroke (publications in Circulation Research and Neurology).
Based on this work, my lab now utilizes profiling, ultrasensitive single-molecule, and point-of-care technologies to identify meaningful signatures to improve stroke care and explores underlying molecular and pathophysiological mechanisms in experimental settings.
2014 – 2018
PhD in Neuroscience (Title: “The role of blood-based biomarkers in ischemic stroke”) at the Graduate School of Systemic Neurosciences and Institute for Stroke and Dementia Research, LMU (Prof. Dr. M. Dichgans)
2009 – 2015
MD thesis (Title: „Regeneration of neurons after brain injury: role of the STAT-signaling pathway in the inhibition of neurogenesis of reactive astrocytes“) at the Institute of Physiology, LMU (Prof. Dr. M. Götz; Summa cum laude)
Board certification Neurology
2013 – 2021
Residency in Neurology at the Institute for Stroke and Dementia Research (Prof. Dr. M. Dichgans) and Department of Neurology, LMU (Prof. Dr. M. Dieterich)
2006 – 2013
Medical studies at the LMU Munich & Harvard Medical School (MA, USA)
Scholarships & Awards:
Young group leader award – Corona-Stiftung
Mentor of the Year (Medical faculty, LMU)
Clinician-Scientist-Program PRIME (DFG, LMU)
Young Investigator Award (European Stroke Organization)
2018 – 2019
MOMENTE-Program for outstanding postdoctoral researchers (LMU)
2016 – 2018
Clinician-Scientist-Program (Cluster of Excellence SyNergy)
Individual research scholarship (Josef-Hackl-Foundation)
2011 – 2012
Program for excellent medical students (MeCuM-StEP, LMU)
Excellent Paper in Neuroscience Award by ERA-NET NEURON
July 2022 – We are proud to share that our work on the diagnostic utility of circulating metabolites after stroke won the Excellent Paper in Neuroscience Award by ERA-NET Neuron 2021. In our paper (Annals of Neurology, 2020), we identify, validate, and replicate a set of four circulating metabolites that shows unprecedented utility and outperforms neuroimaging in identifying patients with stroke upon hospital arrival.
Leducq grant on circadian mechanisms in stroke
November 2021 – The Leducq Foundation - a charitable organization that funds collaborative research in cardiovascular disease and stroke – awarded a new trans-atlantic network of excellence on circadian effects in stroke (coordinators: Eng Lo, Boston, & Alastair Buchan, Oxford). Together with basic, translational, and clinical scientists in the USA, UK, and Spain, the ISD (PI: S. Tiedt) now seeks to understand how circadian biology affects stroke pathophysiology with the ultimate aim to identify novel therapeutic targets for stroke...
We gratefully acknowledge funding by the following funding agencies:
Excellence program for research and funding (FöFoLe, LMU)