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Université de Fribourg

3D imaging of undissected optically cleared Anopheles stephensi mosquitoes and midguts infected with Plasmodium parasites

Niz, Mariana De ; Kehrer, Jessica ; Brancucci, Nicolas M. B. ; Moalli, Federica ; Reynaud, Emmanuel G. ; Stein, Jens V. ; Frischknecht, Friedrich

In: PLOS ONE, 2020, vol. 15, no. 9, p. e0238134

Malaria is a life-threatening disease, caused by Apicomplexan parasites of the Plasmodium genus. The Anopheles mosquito is necessary for the sexual replication of these parasites and for their transmission to vertebrate hosts, including humans. Imaging of the parasite within the insect vector has been attempted using multiple microscopy methods, most of which are hampered by the presence of...

Université de Fribourg

Platelet transforming growth factor-β1 induces liver sinusoidal endothelial cells to secrete interleukin-6

Balaphas, Alexandre ; Meyer, Jeremy ; Perozzo, Remo ; Zeisser-Labouebe, Magali ; Berndt, Sarah ; Turzi, Antoine ; Fontana, Pierre ; Scapozza, Leonardo ; Gonelle-Gispert, Carmen ; Bühler, Leo H.

In: Cells, 2020, vol. 9, no. 5, p. 1311

The roles and interactions of platelets and liver sinusoidal endothelial cells in liver regeneration are unclear, and the trigger that initiates hepatocyte proliferation is unknown. We aimed to identify the key factors released by activated platelets that induce liver sinusoidal endothelial cells to produce interleukin-6 (IL-6), a cytokine implicated in the early phase of liver regeneration....

Université de Fribourg

Platelet interactions with liver sinusoidal endothelial cells and hepatic stellate cells lead to hepatocyte proliferation

Meyer, Jeremy ; Balaphas, Alexandre ; Fontana, Pierre ; Morel, Philippe ; Robson, Simon C. ; Sadoul, Karin ; Gonelle-Gispert, Carmen ; Bühler, Léo

In: Cells, 2020, vol. 9, no. 5, p. 1243

Background: Platelets were postulated to constitute the trigger of liver regeneration. The aim of this study was to dissect the cellular interactions between the various liver cells involved in liver regeneration and to clarify the role of platelets. (2) Methods: Primary mouse liver sinusoidal endothelial cells (LSECs) were co-incubated with increasing numbers of resting platelets, activated...

Université de Fribourg

Salivary gland macrophages and tissue-resident CD8+ T cells cooperate for homeostatic organ surveillance

Stolp, Bettina ; Thelen, Flavian ; Ficht, Xenia ; Altenburger, Lukas M. ; Ruef, Nora ; Inavalli, V. V. G. Krishna ; Germann, Philipp ; Page, Nicolas ; Moalli, Federica ; Raimondi, Andrea ; Keyser, Kirsten A. ; Jafari, S. Morteza Seyed ; Barone, Francesca ; Dettmer, Matthias S. ; Merkler, Doron ; Iannacone, Matteo ; Sharpe, James ; Schlapbach, Christoph ; Fackler, Oliver T. ; Nägerl, U. Valentin ; Stein, Jens V.

In: Science Immunology, 2020, vol. 5, no. 46, p. eaaz4371

It is well established that tissue macrophages and tissue-resident memory CD8+ T cells (TRM) play important roles for pathogen sensing and rapid protection of barrier tissues. In contrast, the mechanisms by which these two cell types cooperate for homeostatic organ surveillance after clearance of infections is poorly understood. Here, we used intravital imaging to show that TRM dynamically...

Université de Fribourg

In vivo function of the lipid raft protein flotillin-1 during cd8+ t cell–mediated host surveillance

Ficht, Xenia ; Ruef, Nora ; Stolp, Bettina ; Samson, Guerric P. B. ; Moalli, Federica ; Page, Nicolas ; Merkler, Doron ; Nichols, Ben J. ; Diz-Muñoz, Alba ; Legler,, Daniel F. ; Niggli, Verena

In: The Journal of Immunology, 2019, p. -

Flotillin-1 (Flot1) is an evolutionary conserved, ubiquitously expressed lipid raft– associated scaffolding protein. Migration of Flot1-deficient neutrophils is impaired because of a decrease in myosin II–mediated contractility. Flot1 also accumulates in the uropod of polarized T cells, suggesting an analogous role in T cell migration. In this study, we analyzed morphology and migration...

Università della Svizzera italiana

TRPM7 kinase activity is essential for T cell colonization and alloreactivity in the gut

Romagnani, Andrea ; Vettore, Valentina ; Rezzonico-Jost, Tanja ; Hampe, Sarah ; Rottoli, Elsa ; Nadolni, Wiebke ; Perotti, Michela ; Meier, Melanie A. ; Hermanns, Constanze ; Geiger, Sheila ; Wennemuth, Gunther ; Recordati, Camilla ; Matsushita, Masayuki ; Muehlich, Susanne ; Proietti, Michele ; Chubanov, Vladimir ; Gudermann, Thomas ; Grassi, Fabio ; Zierler, Susanna

In: Nature communications, 2017, vol. 8, p. 1917

The melastatin-like transient-receptor-potential-7 protein (TRPM7), harbouring a cation channel and a serine/threonine kinase, has been implicated in thymopoiesis and cytokine expression. Here we show, by analysing TRPM7 kinase-dead mutant (Trpm7 R/R) mice, that the enzymatic activity of the receptor is not essential for thymopoiesis, but is required for CD103 transcription and gut-homing of ...

Università della Svizzera italiana

PECAM-1 stabilizes blood-brain barrier integrity and favors paracellular T-Cell diapedesis across the blood-brain barrier during neuroinflammation

Wimmer, Isabella ; Tietz, Silvia ; Nishihara, Hideaki ; Deutsch, Urban ; Sallusto, Federica ; Gosselet, Fabien ; Lyck, Ruth ; Muller, William A. ; Lassmann, Hans ; Engelhardt, Britta

In: Frontiers in immunology, 2019, vol. 10, p. 711

Breakdown of the blood-brain barrier (BBB) and increased immune cell trafficking into the central nervous system (CNS) are hallmarks of the pathogenesis of multiple sclerosis (MS). Platelet endothelial cell adhesion molecule-1 (PECAM-1; CD31) is expressed on cells of the vascular compartment and regulates vascular integrity and immune cell trafficking. Involvement of PECAM-1 in MS pathogenesis...

Università della Svizzera italiana

Leukocyte tracking database, a collection of immune cell tracks from intravital 2-photon microscopy videos

Pizzagalli, Diego Ulisse ; Farsakoglu, Yagmur ; Palomino-Segura, Miguel ; Palladino, Elisa ; Sintes, Jordi ; Marangoni, Francesco ; Mempel, Thorsten R. ; Koh, Wan Hon ; Murooka, Thomas T. ; Thelen, Flavian ; Stein, Jens V. ; Pozzi, Giuseppe ; Marcus Thelen ; Krause, Rolf ; Gonzalez, Santiago Fernandez

In: Scientific data, 2018, vol. 5, p. 180129

Recent advances in intravital video microscopy have allowed the visualization of leukocyte behavior in vivo, revealing unprecedented spatiotemporal dynamics of immune cell interaction. However, state-of-the-art software and methods for automatically measuring cell migration exhibit limitations in tracking the position of leukocytes over time. Challenges arise both from the complex migration...