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2. Microglia states and nomenclature: A field at its crossroads

Author

Paolicelli, Rosa C, Sierra, Amanda, Stevens, Beth, Tremblay, Marie-Eve, Aguzzi, Adriano, Ajami, Bahareh, Amit, Ido, Audinat, Etienne, Bechmann, Ingo, Bennett, Mariko, Bennett, Frederick, Bessis, Alain, Biber, Knut, Bilbo, Staci, Blurton-Jones, Mathew, Boddeke, Erik, Brites, Dora, Brône, Bert, Brown, Guy C, Butovsky, Oleg, Carson, Monica J, Castellano, Bernardo, Colonna, Marco, Cowley, Sally A, Cunningham, Colm, Davalos, Dimitrios, De Jager, Philip L, de Strooper, Bart, Denes, Adam, Eggen, Bart JL, Eyo, Ukpong, Galea, Elena, Garel, Sonia, Ginhoux, Florent, Glass, Christopher K, Gokce, Ozgun, Gomez-Nicola, Diego, González, Berta, Gordon, Siamon, Graeber, Manuel B, Greenhalgh, Andrew D, Gressens, Pierre, Greter, Melanie, Gutmann, David H, Haass, Christian, Heneka, Michael T, Heppner, Frank L, Hong, Soyon, Hume, David A, Jung, Steffen, Kettenmann, Helmut, Kipnis, Jonathan, Koyama, Ryuta, Lemke, Greg, Lynch, Marina, Majewska, Ania, Malcangio, Marzia, Malm, Tarja, Mancuso, Renzo, Masuda, Takahiro, Matteoli, Michela, McColl, Barry W, Miron, Veronique E, Molofsky, Anna Victoria, Monje, Michelle, Mracsko, Eva, Nadjar, Agnes, Neher, Jonas J, Neniskyte, Urte, Neumann, Harald, Noda, Mami, Peng, Bo, Peri, Francesca, Perry, V Hugh, Popovich, Phillip G, Pridans, Clare, Priller, Josef, Prinz, Marco, Ragozzino, Davide, Ransohoff, Richard M, Salter, Michael W, Schaefer, Anne, Schafer, Dorothy P, Schwartz, Michal, Simons, Mikael, Smith, Cody J, Streit, Wolfgang J, Tay, Tuan Leng, Tsai, Li-Huei, Verkhratsky, Alexei, von Bernhardi, Rommy, Wake, Hiroaki, Wittamer, Valérie, Wolf, Susanne A, Wu, Long-Jun, and Wyss-Coray, Tony

Subjects
Microglia, Neurosciences, Psychology, Cognitive Sciences, Neurology & Neurosurgery
Abstract

Microglial research has advanced considerably in recent decades yet has been constrained by a rolling series of dichotomies such as "resting versus activated" and "M1 versus M2." This dualistic classification of good or bad microglia is inconsistent with the wide repertoire of microglial states and functions in development, plasticity, aging, and diseases that were elucidated in recent years. New designations continuously arising in an attempt to describe the different microglial states, notably defined using transcriptomics and proteomics, may easily lead to a misleading, although unintentional, coupling of categories and functions. To address these issues, we assembled a group of multidisciplinary experts to discuss our current understanding of microglial states as a dynamic concept and the importance of addressing microglial function. Here, we provide a conceptual framework and recommendations on the use of microglial nomenclature for researchers, reviewers, and editors, which will serve as the foundations for a future white paper.

Published
2022

6. Sialic acid metabolism orchestrates transcellular connectivity and signaling in glioblastoma

Author

Kuliesiute, Ugne, primary, Joseph, Kevin, additional, Straehle, Jakob, additional, Madapusi Ravi, Vidhya, additional, Kueckelhaus, Jan, additional, Kada Benotmane, Jasim, additional, Zhang, Junyi, additional, Vlachos, Andreas, additional, Beck, Juergen, additional, Schnell, Oliver, additional, Neniskyte, Urte, additional, and Heiland, Dieter Henrik, additional

Published
2023
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9. Microglia states and nomenclature: A field at its crossroads.

Author

Paolicelli, Rosa C., Sierra, Amanda, Stevens, Beth, Tremblay, Marie-Eve, Aguzzi, Adriano, Ajami, Bahareh, Amit, Ido, Audinat, Etienne, Bechmann, Ingo, Bennett, Mariko, Bennett, Frederick, Bessis, Alain, Biber, Knut, Bilbo, Staci, Blurton-Jones, Mathew, Boddeke, Erik, Brites, Dora, Brône, Bert, Brown, Guy C., Butovsky, Oleg, Carson, Monica J., Castellano, Bernardo, Colonna, Marco, Cowley, Sally A., Cunningham, Colm, Davalos, Dimitrios, De Jager, Philip L., de Strooper, Bart, Denes, Adam, Eggen, Bart J. L., Eyo, Ukpong, Galea, Elena, Garel, Sonia, Ginhoux, Florent, Glass, Christopher K., Gokce, Ozgun, Gomez-Nicola, Diego, González, Berta, Gordon, Siamon, Graeber, Manuel B., Greenhalgh, Andrew D., Gressens, Pierre, Greter, Melanie, Gutmann, David H., Haass, Christian, Heneka, Michael, Heppner, Frank L., Hong, Soyon, Hume, David A., Jung, Steffen, Kettenmann, Helmut, Kipnis, Jonathan, Koyama, Ryuta, Lemke, Greg, Lynch, Marina, Majewska, Ania, Malcangio, Marzia, Malm, Tarja, Mancuso, Renzo, Masuda, Takahiro, Matteoli, Michela, McColl, Barry W., Miron, Veronique E., Molofsky, Anna Victoria, Monje, Michelle, Mracsko, Eva, Nadjar, Agnes, Neher, Jonas J., Neniskyte, Urte, Neumann, Harald, Noda, Mami, Peng, Bo, Peri, Francesca, Perry, V. Hugh, Popovich, Phillip G., Pridans, Clare, Priller, Josef, Prinz, Marco, Ragozzino, Davide, Ransohoff, Richard M., Salter, Michael W., Schaefer, Anne, Schafer, Dorothy P., Schwartz, Michal, Simons, Mikael, Smith, Cody J., Streit, Wolfgang J., Tay, Tuan Leng, Tsai, Li-Huei, Verkhratsky, Alexei, von Bernhardi, Rommy, Wake, Hiroaki, Wittamer, Valérie, Wolf, Susanne A., Wu, Long-Jun, Wyss-Coray, Tony, Paolicelli, Rosa C., Sierra, Amanda, Stevens, Beth, Tremblay, Marie-Eve, Aguzzi, Adriano, Ajami, Bahareh, Amit, Ido, Audinat, Etienne, Bechmann, Ingo, Bennett, Mariko, Bennett, Frederick, Bessis, Alain, Biber, Knut, Bilbo, Staci, Blurton-Jones, Mathew, Boddeke, Erik, Brites, Dora, Brône, Bert, Brown, Guy C., Butovsky, Oleg, Carson, Monica J., Castellano, Bernardo, Colonna, Marco, Cowley, Sally A., Cunningham, Colm, Davalos, Dimitrios, De Jager, Philip L., de Strooper, Bart, Denes, Adam, Eggen, Bart J. L., Eyo, Ukpong, Galea, Elena, Garel, Sonia, Ginhoux, Florent, Glass, Christopher K., Gokce, Ozgun, Gomez-Nicola, Diego, González, Berta, Gordon, Siamon, Graeber, Manuel B., Greenhalgh, Andrew D., Gressens, Pierre, Greter, Melanie, Gutmann, David H., Haass, Christian, Heneka, Michael, Heppner, Frank L., Hong, Soyon, Hume, David A., Jung, Steffen, Kettenmann, Helmut, Kipnis, Jonathan, Koyama, Ryuta, Lemke, Greg, Lynch, Marina, Majewska, Ania, Malcangio, Marzia, Malm, Tarja, Mancuso, Renzo, Masuda, Takahiro, Matteoli, Michela, McColl, Barry W., Miron, Veronique E., Molofsky, Anna Victoria, Monje, Michelle, Mracsko, Eva, Nadjar, Agnes, Neher, Jonas J., Neniskyte, Urte, Neumann, Harald, Noda, Mami, Peng, Bo, Peri, Francesca, Perry, V. Hugh, Popovich, Phillip G., Pridans, Clare, Priller, Josef, Prinz, Marco, Ragozzino, Davide, Ransohoff, Richard M., Salter, Michael W., Schaefer, Anne, Schafer, Dorothy P., Schwartz, Michal, Simons, Mikael, Smith, Cody J., Streit, Wolfgang J., Tay, Tuan Leng, Tsai, Li-Huei, Verkhratsky, Alexei, von Bernhardi, Rommy, Wake, Hiroaki, Wittamer, Valérie, Wolf, Susanne A., Wu, Long-Jun, and Wyss-Coray, Tony

Abstract

Microglial research has advanced considerably in recent decades yet has been constrained by a rolling series of dichotomies such as "resting versus activated" and "M1 versus M2." This dualistic classification of good or bad microglia is inconsistent with the wide repertoire of microglial states and functions in development, plasticity, aging, and diseases that were elucidated in recent years. New designations continuously arising in an attempt to describe the different microglial states, notably defined using transcriptomics and proteomics, may easily lead to a misleading, although unintentional, coupling of categories and functions. To address these issues, we assembled a group of multidisciplinary experts to discuss our current understanding of microglial states as a dynamic concept and the importance of addressing microglial function. Here, we provide a conceptual framework and recommendations on the use of microglial nomenclature for researchers, reviewers, and editors, which will serve as the foundations for a future white paper.

Published
2022

10. Microglia states and nomenclature: A field at its crossroads.

Author

Paolicelli, Rosa RC, Sierra, Amanda, Stevens, Beth, Tremblay, Marie-Eve, Aguzzi, Adriano, Ajami, Bahareh, Amit, Ido, Audinat, Etienne, Bechmann, Ingo, Bennett, Mariko, Bennett, Frederick, Bessis, Alain, Biber, Knut, Bilbo, Staci, Blurton-Jones, Mathew, Boddeke, Erik, Brites, Dora, Brône, Bert, Brown, Guy C, Butovsky, Oleg, Carson, Monica J, Castellano, Bernardo, Colonna, Marco, Cowley, Sally A, Cunningham, Colm, Davalos, Dimitrios, De Jager, Philip L, De Strooper, Bart, Denes, Adam, Eggen, Bart BJL, Eyo, Ukpong, Galea, Elena, Garel, Sonia, Ginhoux, Florent, Glass, Christopher K, Gokce, Ozgun, Gomez-Nicola, Diego, González, Berta, Gordon, Siamon, Graeber, Manuel MB, Greenhalgh, Andrew AD, Gressens, Pierre, Greter, Melanie, Gutmann, David DH, Haass, Christian, Heneka, Michael MT, Heppner, Frank FL, Hong, Soyon, Hume, David DA, Jung, Steffen, Kettenmann, Helmut, Kipnis, Jonathan, Koyama, Ryuta, Lemke, Greg, Lynch, Marina, Majewska, Ania, Malcangio, Marzia, Malm, Tarja, Mancuso, Renzo, Masuda, Takahiro, Matteoli, Michela, McColl, Barry W, Miron, Veronique E, Molofsky, Anna Victoria, Monje, Michelle, Mracsko, Eva, Nadjar, Agnes, Neher, Jonas JJ, Neniskyte, Urte, Neumann, Frank Harald, Noda, Mami, Peng, Bo, Peri, Francesca, Perry, Hugh VH, Popovich, Phillip PG, Pridans, Clare, Priller, Josef, Prinz, Marco, Ragozzino, Davide, Ransohoff, Richard M, Salter, Michael W, Schaefer, Anne, Schafer, Dorothy P, Schwartz, Michal, Simons, Mikael, Smith, Cody J, Streit, Wolfgang WJ, Tay, Tuan Leng, Tsai, Li-Huei, Verkhratsky, Alexei, von Bernhardi, Rommy, Wake, Hiroaki, Wittamer, Valérie, Wolf, Susanne A, Wu, Long-Jun, Wyss-Coray, Tony, Paolicelli, Rosa RC, Sierra, Amanda, Stevens, Beth, Tremblay, Marie-Eve, Aguzzi, Adriano, Ajami, Bahareh, Amit, Ido, Audinat, Etienne, Bechmann, Ingo, Bennett, Mariko, Bennett, Frederick, Bessis, Alain, Biber, Knut, Bilbo, Staci, Blurton-Jones, Mathew, Boddeke, Erik, Brites, Dora, Brône, Bert, Brown, Guy C, Butovsky, Oleg, Carson, Monica J, Castellano, Bernardo, Colonna, Marco, Cowley, Sally A, Cunningham, Colm, Davalos, Dimitrios, De Jager, Philip L, De Strooper, Bart, Denes, Adam, Eggen, Bart BJL, Eyo, Ukpong, Galea, Elena, Garel, Sonia, Ginhoux, Florent, Glass, Christopher K, Gokce, Ozgun, Gomez-Nicola, Diego, González, Berta, Gordon, Siamon, Graeber, Manuel MB, Greenhalgh, Andrew AD, Gressens, Pierre, Greter, Melanie, Gutmann, David DH, Haass, Christian, Heneka, Michael MT, Heppner, Frank FL, Hong, Soyon, Hume, David DA, Jung, Steffen, Kettenmann, Helmut, Kipnis, Jonathan, Koyama, Ryuta, Lemke, Greg, Lynch, Marina, Majewska, Ania, Malcangio, Marzia, Malm, Tarja, Mancuso, Renzo, Masuda, Takahiro, Matteoli, Michela, McColl, Barry W, Miron, Veronique E, Molofsky, Anna Victoria, Monje, Michelle, Mracsko, Eva, Nadjar, Agnes, Neher, Jonas JJ, Neniskyte, Urte, Neumann, Frank Harald, Noda, Mami, Peng, Bo, Peri, Francesca, Perry, Hugh VH, Popovich, Phillip PG, Pridans, Clare, Priller, Josef, Prinz, Marco, Ragozzino, Davide, Ransohoff, Richard M, Salter, Michael W, Schaefer, Anne, Schafer, Dorothy P, Schwartz, Michal, Simons, Mikael, Smith, Cody J, Streit, Wolfgang WJ, Tay, Tuan Leng, Tsai, Li-Huei, Verkhratsky, Alexei, von Bernhardi, Rommy, Wake, Hiroaki, Wittamer, Valérie, Wolf, Susanne A, Wu, Long-Jun, and Wyss-Coray, Tony

Abstract

Microglial research has advanced considerably in recent decades yet has been constrained by a rolling series of dichotomies such as "resting versus activated" and "M1 versus M2." This dualistic classification of good or bad microglia is inconsistent with the wide repertoire of microglial states and functions in development, plasticity, aging, and diseases that were elucidated in recent years. New designations continuously arising in an attempt to describe the different microglial states, notably defined using transcriptomics and proteomics, may easily lead to a misleading, although unintentional, coupling of categories and functions. To address these issues, we assembled a group of multidisciplinary experts to discuss our current understanding of microglial states as a dynamic concept and the importance of addressing microglial function. Here, we provide a conceptual framework and recommendations on the use of microglial nomenclature for researchers, reviewers, and editors, which will serve as the foundations for a future white paper., SCOPUS: re.j, info:eu-repo/semantics/published

Published
2022

11. Lysosome-targeted photodynamic treatment induces primary keratinocyte differentiation

Author

Daugelaviciene, Neringa, Grigaitis, Pranas, Gasiule, Liepa, Dabkeviciene, Daiva, Neniskyte, Urte, Sasnauskiene, Ausra, Daugelaviciene, Neringa, Grigaitis, Pranas, Gasiule, Liepa, Dabkeviciene, Daiva, Neniskyte, Urte, and Sasnauskiene, Ausra

Abstract

Photodynamic therapy is an attractive technique for various skin tumors and non-cancerous skin lesions. However, while the aim of photodynamic therapy is to target and damage only the malignant cells, it unavoidably affects some of the healthy cells surrounding the tumor as well. However, data on the effects of PDT to normal cells are scarce, and the characterization of the pathways activated after the photodamage of normal cells may help to improve clinical photodynamic therapy. In our study, primary human epidermal keratinocytes were used to evaluate photodynamic treatment effects of photosensitizers with different subcellular localization. We compared the response of keratinocytes to lysosomal photodamage induced by phthalocyanines, aluminum phthalocyanine disulfonate (AlPcS2a) or aluminum phthalocyanine tetrasulfonate (AlPcS4), and cellular membrane photodamage by m-tetra(3-hydroxyphenyl)-chlorin (mTHPC). Our data showed that mTHPC-PDT promoted autophagic flux, whereas lysosomal photodamage induced by aluminum phthalocyanines evoked differentiation and apoptosis. Photodamage by AlPcS2a, which is targeted to lysosomal membranes, induced keratinocyte differentiation and apoptosis more efficiently than AlPcS4, which is targeted to lysosomal lumen. Computational analysis of the interplay between these molecular pathways revealed that keratin 10 is the coordinating molecular hub of primary keratinocyte differentiation, apoptosis and autophagy.

Published
2021
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17. Inhibition of UDP/P2Y6 purinergic signaling prevents phagocytosis of viable neurons by activated microglia in vitro and in vivo

Author

Neher, Jonas J, Neniskyte, Urte, Hornik, Tamara, and Brown, Guy C

Subjects
Lipopolysaccharides, Male, P2Y6 receptor, Uridine Diphosphate, neuroinflammation, phagoptosis, Phagocytosis, Isothiocyanates, Peroxynitrous Acid, Purinergic P2 Receptor Antagonists, Animals, Rats, Wistar, Research Articles, Cells, Cultured, Neurons, Amyloid beta-Peptides, Cell Death, Receptors, Purinergic P2, Triazines, Apyrase, Thiourea, Corpus Striatum, Peptide Fragments, Teichoic Acids, Neuroprotective Agents, nervous system, amyloid β, Microglia, Signal Transduction
Abstract

Microglia activated through Toll-like receptor (TLR)-2 or -4 can cause neuronal death by phagocytosing otherwise-viable neurons-a form of cell death called "phagoptosis." UDP release from neurons has been shown to provoke microglial phagocytosis of neurons via microglial P2Y6 receptors, but whether inhibition of this process affects neuronal survival is unknown. We tested here whether inhibition of P2Y6 signaling could prevent neuronal death in inflammatory conditions, and whether UDP signaling can induce phagoptosis of stressed but viable neurons. We find that delayed neuronal loss and death in mixed neuronal/glial cultures induced by the TLR ligands lipopolysaccharide (LPS) or lipoteichoic acid was prevented by: apyrase (to degrade nucleotides), Reactive Blue 2 (to inhibit purinergic signaling), or MRS2578 (to specifically block P2Y6 receptors). In each case, inflammatory activation of microglia was not affected, and the rescued neurons remained viable for at least 7 days. Blocking P2Y6 receptors with MRS2578 also prevented phagoptosis of neurons induced by 250 nM amyloid beta 1-42, 5 μM peroxynitrite, or 50 μM 3-morpholinosydnonimine (which releases reactive oxygen and nitrogen species). Furthermore, the P2Y6 receptor agonist UDP by itself was sufficient to stimulate microglial phagocytosis and to induce rapid neuronal loss that was prevented by eliminating microglia or inhibiting phagocytosis. In vivo, injection of LPS into rat striatum induced microglial activation and delayed neuronal loss and blocking P2Y6 receptors with MRS2578 prevented this neuronal loss. Thus, blocking UDP/P2Y6 signaling is sufficient to prevent neuronal loss and death induced by a wide range of stimuli that activate microglial phagocytosis of neurons.

Published
2014

18. Microglia remodel synapses by presynaptic trogocytosis and spine head filopodia induction

Author

Weinhard, Laetitia, primary, di Bartolomei, Giulia, additional, Bolasco, Giulia, additional, Machado, Pedro, additional, Schieber, Nicole L., additional, Neniskyte, Urte, additional, Exiga, Melanie, additional, Vadisiute, Auguste, additional, Raggioli, Angelo, additional, Schertel, Andreas, additional, Schwab, Yannick, additional, and Gross, Cornelius T., additional

Published
2018
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21. Sexual dimorphism of microglia and synapses during mouse postnatal development

Author

Weinhard, Laetitia, Neniskyte, Urte, Vadisiute, Auguste, di Bartolomei, Giulia, Aygün, Nil, Riviere, Laurie, Zonfrillo, Francesca, Dymecki, Susan, and Gross, Cornelius

Subjects
sex differences, microglia, hippocampus, synapse formation, postnatal development
Abstract

Microglia participate in synapse remodeling in the cortex and hippocampus during mouse postnatal development. Although sex differences in microglia activity during embryonic development have been reported in these regions, it remains unexplored whether microglia show sexually dimorphic features during the early postnatal period, a critical window for synapse formation and maturation. Here, we investigated morphological and functional features of microglia across early postnatal development as well as morphological features of both pre‐ and postsynaptic neuronal compartments in the mouse hippocampus. We found a sex‐dependent shift in microglia volume and phagocytic capacity across the first four postnatal weeks. Measurements of synaptic features revealed sex differences in the density of synaptic spines and boutons during the second postnatal week. These data are consistent with a precocious development of both microglia and synapses in the female brain. We further hypothesize that this bias may contribute to sex‐specific brain wiring. © 2017 The Authors. Developmental Neurobiology Published by Wiley Periodicals, Inc. Develop Neurobiol 78: 618–626, 2018

Published
2018
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