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Vascular Immunology

Projektleiter: PD Dr. Dennis Wolf

Scientific mission

The Vascular Immunology Laboratory focuses on inflammatory and immune cell mechanisms in cardio-metabolic disease with a particular emphasis on atherosclerosis, adipose tissue inflammation, myocardial infarction, and immune cell trafficking. Atherosclerosis is the most life-threatening pathology worldwide. Its major clinical complications, stroke, myocardial infarction, and heart failure are on the rise in many regions of the world - despite considerable progress in understanding cause, progression, and consequences of atherosclerosis. Atherosclerosis was originally perceived as a lipid- storage disease of the arterial wall but research in the late 80s increasingly established that chronic inflammation in the vasculature critically drives and maintains cardiovascular disease. This inflammatory response involves the presence and accumulation of lymphocytes in the vessel wall that can trigger or inhibit inflammation. It got increasingly clear that lymphocytes and myeloid cells in the vessel wall respond to stimuli and antigens expressed or deposited in the vessel wall, such as low-density lipoprotein (LDL) cholesterol. Vascular immunology is the discipline to describe, understand, and modify the immune response in the vessel wall. Manipulating inflammation and immunity both holds promise for new therapeutic strategies in cardiovascular disease. Ongoing work also suggests that it may be possible to develop antigen-specific immunomodulatory prevention and therapy - a vaccine against atherosclerosis. We are dedicated to contributing to this emerging field and have established a variety of basic and specialized experimental methods, lab techniques, such as immune-cell phenotyping by FACS, time-of-flight mass cytometry (CyTOF), confocal and two-photon imaging, gene expression profiling (RNA-seq.), and various animal methods (intravital microscopy, adoptive transfers, atherosclerosis, adipose tissue inflammation, myocardial infarction, intimal hyper-proliferation, in vivo thrombosis), some of which are carried out in close collaboration with a network of atherosclerosis and immunology labs around the world. Besides, we are also employing various basic lab techniques (molecular biology, protein-biochemistry, and cell culture). Several MD-, Master-, and PhD students were trained in the laboratory since 2009. 

Immune cells are interaction in vessel wall: Two-photon microscopy of an explanted atherosclerotic aorta from an Apoe-knock out mouse that develops atherosclerosis when fed a high-cholesterol diet. In this mouse, antigen-presenting cells (APCs) are labeled with a blue fluorochrome (CD11c-YFP reporter). ApoB-specific T cells (red) are added and their infiltration into the tissue and their interaction with APCs was monitored over 12 hours.

PD Dr. Dennis Wolf, MD

PD Dr. Dennis Wolf, MD

Tel.: +49-761-270-35460
Fax: +49-761-270-34010
Email: dennis.wolf@uniklinik-freiburg.de

Curriculum Vitae

Vascular Immunology Lab
Molecular Cardiology
Breisacher Strasse 33, 79106 Freiburg, Germany

Tel.: +49-761-270-70370
Fax: +49-761-270-70060

Lisa Spiga

Lisa Spiga
Lab Manager

Email: lisa.fuener@uniklinik-freiburg.de

Dr. rer. nat. Timoteo Marchini

Dr. rer. nat. Timoteo Marchini
PhD, Post-doc

Email: timoteo.marchini@uniklinik-freiburg.de

Dr. med. Sven Piepenburg

Dr. med. Sven Piepenburg
MD, Post-doc

Email: sven.piepenburg@uniklinik-freiburg.de

Mark Colin Gissler

Mark Colin Gissler
MD, Post-doc

Email: mark.colin.gissler@uniklinik-freiburg.de

Lucia Sol Mitre

Lucia Sol Mitre
MD, MSc (IMBS), PhD-student (SGBM)

Email: lucia.mitre@uniklinik-freiburg.de

Tijani Olawale

Tijani Olawale
MSc, PhD-student (SGBM)

Email: sheu.abogunloko@uniklinik-freiburg.de

Guido Pisani

Guido Pisani
MSc student (IMBS)

Email:  guido.pisani@uniklinik-freiburg.de

Abed Al Hadi El Rabih

Abed Al Hadi El Rabih
MSc student (IMBS)

Email: abedalhadi.el.rabih@uniklinik-freiburg.de

Valentin Hildemann

Valentin Hildemann
MSc student (Bioinformatics)

Xia Sheng

Xia Sheng
MD, MD-student

Email: xia.sheng@uniklinik-freiburg.de

Timothy Bon-Nawul Mwin

Timothy Bon-Nawul Mwin
BSc, Technical assistent

Email: timothy.bon-nawul.mwinyella@uniklinik-freiburg.de

Hauke Horstmann

Hauke Horstmann
MD student, Kaltenbach-Doktorandenstipendium scholar

Email: hauke.horstmann@uniklinik-freiburg.de

Sophie Hansen

Sophie Hansen
MD student, MOTI-VATE scholar

Email: sophie.hansen@uniklinik-freiburg.de

Philipp Scherrer

Philipp Scherrer
MD student, Otto-Hess-Promotionsstipendium scholar

Email: philipp.scherrer@uniklinik-freiburg.de

Xiaowei Li

Xiaowei Li
MD student

Email: xiaowei.li@uniklinik-freiburg.de

Ana-Sophie Burkard

Ana-Sophie Burkard

Email: ana-sophia.burkard@uniklinik-freiburg.de

Simon Heitlinger

Simon Heitlinger

Katharina Wißkirchen

Katharina Wißkirchen

Email: katharina.wisskirchen@uniklinik-freiburg.de

Sara Malchow

Sara Malchow
MSc student (Molecular Medicine)

Email: sara.malchow@uniklinik-freiburg.de


  • Mona Reuvers, Lab manager
  • Teresa Gerhardt, MD (MD-thesis: “Loss of protective autoimmunity in atherosclerosis“)
  • Dr. rer. nat. Nathaly Anto-Michel, PhD, MSc (MSc-thesis: “Characterization of a novel antibody targeting the CD40L/Mac-1 interaction in vascular disease”, PhD-thesis: “The Role of Tumor Necrosis Receptor associated Factor (TRAF) -1 in cardio-metabolic disease“)
  • Lucia Sol Mitre (MSc-thesis: “Characterization of the immune cell repertoire in Myocardial Infarction and Heart Failure“)
  • Dr. med. Hermann Blankenbach (MD-thesis: “Generierung und Charakterisierung eines neuen Liganden- und Aktivitäts-spezifischen Antiköpers zur selektiven Hemmung der CD40L/Mac-1 Interaktion“)
  • Dr. med. Ansgar Wiedemann (MD-thesis: „Mechanismen der CD40L/Mac-1 vermittelten Inflammation“)
  • Dr. med. Felix Jehle (MD-thesis: „Die Rolle von CD40 Ligand und seinem Rezeptor CD40 in der Pathogenese des Metabolischen Syndroms“)
  • Dr. med. Eva Nora Bukosza (MD-thesis: “Contribution of the CD40L/Mac-1 pathway to the metabolic syndrome”)

We are currently accepting applications for MD-, Master-, PhD students, and for Postdoctoral Fellows at dennis.wolf@uniklinik-freiburg.de. MD students can choose between an experimental thesis work in the laboratory or a clinical-experimental thesis with patient samples. Students will be trained in all required methods, animal care, as well as in project design, data analysis, and presentation. They will be offered with the chance to present data on scientific conferences and will be supported with applications for grants or stipends. Full-time work for one year in the laboratory is required.

Please provide a C.V. and a summary of your previous scientific work and/or your scientific interest.


Defining the adaptive immune response to develop a vaccine against atherosclerosis

Most people worldwide die of cardiovascular disease, such as of heart attack and stroke. Often, the underlying cause is atherosclerosis, a disease that fuels the build-up of vessel-narrowing plaques in arteries that are vital because they supply the heart and the brain. During early disease, a subgroup of white blood cells called T cells infiltrate the plaque and drive its growth. Usually, these immune cells protect from infection, but in atherosclerosis some T cells attack the body itself. This is why atherosclerosis is now understood as auto-immune disease. They get attracted by the protein ApoB-100, which is a part of LDL-cholesterol in the plaque. However, little is known about the function of these self-reactive T cells and how to dampen their harmful action. Using innovative tools, such as 2-photon microscopy of explanted atherosclerotic plaques (see above, left), combined with classical atherosclerosis tools, such as quantification of atherosclerotic lesions in mice (middle), and MHC-multimers to track single auto-reactive T cells we are asking some intriguing questions: What is the frequency and function of autoreactive T cells? Which proteins and genes do they express? When transferred into another animal, how do these autoreactive T cells change atherosclerosis in the recipient? We are also trying to track auto-reactive T cells in humans with coronary artery disease. Deciphering how the immune system and the T cell response work in atherosclerosis will not only boost our understanding of auto-immunity in atherosclerosis but it will also build the basis to define new therapies. Our long-term goal is to define the properties of a vaccine against ApoB-100 to modify the immune system in a way that protective autoreactive T cells are boosted. Such therapy would represent the first causal preventive therapy against the atherosclerosis-related immune response in future.

Suggested reading:  

1.    Pathogenic Autoimmunity in Atherosclerosis Evolves From Initially
       Protective Apolipoprotein B100-Reactive CD4+ T-Regulatory Cells      
       link: https://pubmed.ncbi.nlm.nih.gov/32703007/

2.    Immunity and Inflammation in Atherosclerosis.       
       link: https://pubmed.ncbi.nlm.nih.gov/30653442/

3.     Regulatory CD4+ T Cells Recognize MHC-II-Restricted Peptide Epitopes of 
        Apolipoprotein B
        link: https://www.ncbi.nlm.nih.gov/pubmed/29588316


Therapeutic targeting of integrins in inflammation

The recruitment of leukocytes to inflamed tissue is a necessary step to resolve inflammation and infection in tissues. However, this initially protective attempt is often dysregulated and initiates a vicious circle that attracts more leukocytes, drives inflammatory cytokine secretion, and eventually causes tissue damage. One solution to this problem is to block leukocyte recruitment by inhibiting the molecules on leukocytes that are required for leukocytes to attach to the endothelium and to transmigrate into the tissue. Yes, this may be problematic, because adhesion molecules, e.g. leukocyte integrins, are simultaneously needed for many beneficial functions, such as phagocytosis, bacterial clearance and cell-cell interactions. We found that the interaction of one leukocyte integrin, Mac-1, with the immune molecule CD40L specifically regulates harmful cell recruitment by binding to endothelial CD40L and serving as adhesion receptor (see schematic above) without interfering with Mac-1’s protective functions in host defense, thrombosis, and wound healing. We designed an antibody and a peptide to specifically neutralize this receptor-ligand interaction, while leaving other potentially beneficial functions of the leukocyte integrin untouched. Our work documents a novel therapeutic strategy that protects from atherosclerosis and sepsis without relevant side effects observed in conventional treatment strategies. Two international patents arose from this work, which now serve as basis to ultimately develop a novel leukocyte recruitment blocker for human disease. We are using with a variety of protein assays to monitor the interaction of proteins and inhibitors and testing these directly in vivo in intravital microscopy and several inflammatory models, such as in experimental sepsis or peritonitis. Currently, we are also testing whether the specific inhibitor of the CD40L/Mac-1 interaction prevents adverse cardiac remodeling after myocardial infarction.

Suggested reading:  

1.     A ligand-specific blockade of the integrin Mac-1 selectively targets pathologic
        inflammation while maintaining protective host-defense
        ink: https://www.ncbi.nlm.nih.gov/pubmed/29410422

2.     CD40L and Its Receptors in Atherothrombosis-An Update
        link: https://www.ncbi.nlm.nih.gov/pubmed/28676852

3.     Binding of CD40L to Mac-1's I-domain involves the EQLKKSKTL motif and
        mediates leukocyte recruitment and atherosclerosis - but does not affect
        immunity and thrombosis in mice
        link: https://www.ncbi.nlm.nih.gov/pubmed/21998326


Finding inflammatory signaling pathways in cardio-metabolic disease

Atherosclerosis, its acute complication myocardial infarction, as well as other cardiovascular disease is initiated and maintained by cardiovascular risk factors, such as obesity, insulin resistance, hypertension, hyperlipidemia, often referred to as the Metabolic Syndrome. It is now well established that some components of the Metabolic Syndrome, such as obesity and insulin resistance, drive an inflammatory response in visceral adipose tissue. It is, however, not known to which extend adipose tissue inflammation contributes to atherosclerosis and whether mutual inflammatory pathways exist that are druggable to define therapies that target both: risk factors and vascular disease simultaneously. We have found that CD40L, a costimulatory molecule initially described on activated T cells, is expressed on adipocytes, particular in obese, inflamed adipose tissue. Functionally, mice with a genetic deficiency of CD40L are protected from inflammation, while a deficiency of its classical interaction partner CD40 induces a hyper-inflammatory phenotype in adipose tissue and aggravated dysmetabolism in mice. A deficiency of the signaling adaptor TRAF-1 that is functioning downstream of CD40- and TNF-signaling resembles this hyper inflammatory phenotype, but unexpectedly protects from dysmetabolism. These findings document a novel role of CD40 as co-inhibitory molecule on T cells and suggest that activating CD40 antibodies – as currently tested in cancer trials – can protect from cardio- metabolic disease. Targeting inflammation of visceral adipose tissue alone may, however, not suffice to improve metabolic risk factors. We have developed and used a broad repertoire of methods and techniques to study metabolism in mice, including monitoring fat depositions by MRI (see Figure above, left), histo-morphology of adipocytes (middle), metabolic chambers, and genetic tools to screen for the expression of inflammatory pathways in human fat tissue by gene enrichment analysis (right).

Suggested reading:  

1.     Inflammatory Pathways Regulated by Tumor Necrosis Receptor-Associated
        Factor 1 Protect From Metabolic Consequences in Diet-Induced Obesity
        link: https://www.ncbi.nlm.nih.gov/pubmed/29358227

2.     Coinhibitory suppression of T cell activation by CD40 protects against obesity
        and adipose tissue inflammation in mice
        link: https://www.ncbi.nlm.nih.gov/pubmed/24664276

3.     CD40L deficiency attenuates diet-induced adipose tissue inflammation by
        impairing immune cell accumulation and production of pathogenic
        link: https://www.ncbi.nlm.nih.gov/pubmed/22412980


Depicting leukocyte heterogeneity in atherosclerosis

The development and progression of atherosclerosis is predominately driven by leukocyte infiltration and accumulation in atherosclerotic plaques. Experimentally, atherosclerosis can be prevented and treated by modulating the influx and the function of pro-inflammatory leukocytes. The exact contribution of different leukocyte lineages, their phenotypes, and the existence of atherosclerosis-specific leukocyte subsets, however, is largely unknown. Historical protocols to digest and phenotype leukocytes in atherosclerotic mouse aortas are based on classical flow cytometry and have been applied since 2006 to study leukocyte populations in atherosclerosis and other vascular disease models by many labs around the world. Since then, it became increasingly clear that not all leukocytes found in the atherosclerotic aorta are equal; in fact, many principal aortic leukocyte lineages, such as B- or T-cells, encompass both protective and pathogenic sub-populations. This diversity has great implications on understanding the definitive biology and to establish novel cell-based therapeutic strategies. Our inspiration came from recent observations that high-parameter phenotyping in other disease models has the potential to detect novel sub-populations with unexpected combinations of surface markers. These cells may therefore reflect disease-specific leukocytes and identify subsets beyond what flow cytometry and immunohistochemistry can do. We are using a combination of cell sorting of aortic leukocytes in atherosclerotic mouse aortas (see above, middle and left) and single cell RNA-sequencing. These new approaches are less biased, i.e., make fewer assumptions based on pre-conceived notion. Thus, they are effective, efficient and powerful screening tools. Currently, we are aiming to define leukocyte heterogeneity in human atherosclerotic plaques and to test whether particular leukocyte sub-populations in peripheral blood of humans correlate with cardiovascular disease.

Suggested reading:

1.     Heterogeneity of T Cells in Atherosclerosis Defined by Single-Cell RNA-Sequencing and Cytometry
        by Time of Flight.
        link: https://pubmed.ncbi.nlm.nih.gov/33267666/

2.     Meta-Analysis of Leukocyte Diversity in Atherosclerotic Mouse Aortas.
        link: https://pubmed.ncbi.nlm.nih.gov/32673538/

3.     Atlas of the Immune Cell Repertoire in Mouse Atherosclerosis Defined by
        Single-Cell RNA-Sequencing and Mass Cytometry
        link: https://www.ncbi.nlm.nih.gov/pubmed/29545366

1.      Pathogenic Autoimmunity in Atherosclerosis Evolves From Initially Protective Apolipoprotein B100-Reactive CD4+ T-Regulatory Cells. Wolf D, Gerhardt T, Winkels H, Michel NA, Pramod AB, Ghosheh Y, Brunel S, Buscher K, Miller J, McArdle S, Baas L, Kobiyama K, Vassallo M, Ehinger E, Dileepan T, Ali A, Schell M, Mikulski Z, Sidler D, Kimura T, Sheng X, Horstmann H, Hansen S, Mitre LS, Stachon P, Hilgendorf I, Gaddis DE, Hedrick C, Benedict CA, Peters B, Zirlik A, Sette A, Ley K.
Circulation. 2020 Sep 29;142(13):1279-1293.

2.     A ligand-specific blockade of the integrin Mac-1 selectively targets pathologic inflammation while maintaining protective host-defense. Wolf D, Anto-Michel N, Blankenbach H, Wiedemann A, Buscher K, Hohmann JD, Lim B, Bäuml M, Marki A, Mauler M, Duerschmied D, Fan Z, Winkels H, Sidler D, Diehl P, Zajonc DM, Hilgendorf I, Stachon P, Marchini T, Willecke F, Schell M, Sommer B, von Zur Muhlen C, Reinöhl J, Gerhardt T, Plow EF, Yakubenko V, Libby P, Bode C, Ley K, Peter K, Zirlik A.
Nature communications, 2018; 9(1):52

3.     Atlas of the Immune Cell Repertoire in Mouse Atherosclerosis Defined by Single-Cell RNA- Sequencing and Mass Cytometry. Winkels H, Ehinger E, Vassallo M, Buscher K, Dinh HQ, Kobiyama K, Hamers AAJ, Cochain C, Vafadarnejad E, Saliba AE, Zernecke A, Pramod AB, Ghosh AK, Anto Michel N, Hoppe N, Hilgendorf I, Zirlik A, Hedrick CC, Ley K, Wolf D.
Circulation Research. 2018; 122(12):1675-1688

4.     Inflammatory Pathways Regulated by Tumor Necrosis Receptor- Associated Factor 1 Protect From Metabolic Consequences in Diet-Induced Obesity.
Anto Michel N, Colberg C, Buscher K, Sommer B, Pramod AB, Ehinger E, Dufner B, Hoppe N, Pfeiffer K, Marchini T, Willecke F, Stachon P, Hilgendorf I, Heidt T, von Zur Muhlen C, von Elverfeldt D, Pfeifer D, Schüle R, Kintscher U, Brachs S, Ley K, Bode C, Zirlik A, Wolf D.
Circulation Research. 2018; 122(5):693-700

5.     Coinhibitory suppression of T cell activation by CD40 protects against obesity and adipose tissue inflammation in mice.
Wolf D, Jehle F, Michel NA, Bukosza EN, Rivera J, Chen YC, Hoppe N, Dufner B, Rodriguez AO, Colberg C, Nieto L, Rupprecht B, Wiedemann A, Schulte L, Peikert A, Bassler N, Lozhkin A, Hergeth SP, Stachon P, Hilgendorf I, Willecke F, von Zur Mühlen C, von Elverfeldt D, Binder CJ, Aichele P, Varo N, Febbraio MA, Libby P, Bode C, Peter K, Zirlik A.
Circulation. 2014; 129(23):2414-25

Full list of publications:

June 2021

  • Dennis Wolf receives 1 Million Euro funding for an endowed professorship for “Cardiovascular Systems Immunology” from the Else-Kröner-Fresenius-Stiftung.

April 2021

March 2021

  • MD student Hauke Horstmann is awarded with the Gotthard-Schettler Young Investigator Award of the German Society of Atheroslerosis-Research (DGAF)

December 2021

  • MD student Sophie Hansen receives the Otto-Hess Scholarship of the German Society of Cardiology (DGK)

November 2021

June 2020

May 2020

  • MD student Hauke Horstmann receives the Kaltenbach-Scholarship the German Heart Foundation

March 2020

November 2019

October 2019

September 2019

  • MD student Mark Colin Gissler is awarded for the Best Moderated Poster in “Vascular Signaling” during the congress of the European Society of Cardiology in Paris
  • MD student Mark Colin Gissler receives the Basic Science Travel Award of the European Society of Cardiology

July 2019

  • MD student Hauke Horstmann receives the Poster Award at the Summer School Meeting of the University Heart Centre Freiburg-Bad Kronzingen (Cardiology and Angiology I)
  • MOTIVATE class of 2019, MD student Sophie Hansen will join the MOTIVATE program in 2019
  • MSc student Tijani Olawale receives the Academic Excellence Scholarship of the German Academic Exchange Service (DAAD)

May 2019


Press features

PD Dr. Dennis Wolf, MD

PD Dr. Dennis Wolf

Lab: +49761-270-70370
Klinik: +49761-270-34010