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Ronald N Germain

Jérôme Biton, Hanane Ouakrim, Agnès Dechartres, Marco Alifano, Audrey Mansuet-Lupo, Han Si, Rebecca Halpin, Todd Creasy, Claudie Bantsimba-Malanda, Jennifer Arrondeau, François Goldwasser, Pascaline Boudou-Rouquette, Ludovic Fournel, Nicolas Roche, Pierre-Régis Burgel, Jeremy Goc, Priyanka Devi-Marulkar, Claire Germain, Marie-Caroline Dieu-Nosjean, Isabelle Cremer, Ronald Herbst, Diane Damotte
RATIONALE: Patients with chronic obstructive pulmonary disease (COPD) have a higher prevalence of lung cancer. The chronic inflammation associated with COPD probably promotes the earliest stages of carcinogenesis. However, once tumors have progressed to malignancy, the impact of COPD on the tumor immune microenvironment remains poorly defined, and its effects on immune-checkpoint blockers' efficacy are still unknown. OBJECTIVES: To study the impact of COPD on the immune contexture of non-small cell lung cancer (NSCLC)...
March 8, 2018: American Journal of Respiratory and Critical Care Medicine
Kairui Mao, Antonio P Baptista, Samira Tamoutounour, Lenan Zhuang, Nicolas Bouladoux, Andrew J Martins, Yuefeng Huang, Michael Y Gerner, Yasmine Belkaid, Ronald N Germain
The mammalian gut is colonized by numerous microorganisms collectively termed the microbiota, which have a mutually beneficial relationship with their host. Normally, the gut microbiota matures during ontogeny to a state of balanced commensalism marked by the absence of adverse inflammation. Subsets of innate lymphoid cells (ILCs) and conventional T cells are considered to have redundant functions in containment and clearance of microbial pathogens, but how these two major lymphoid-cell populations each contribute to shaping the mature commensal microbiome and help to maintain tissue homeostasis has not been determined...
February 8, 2018: Nature
Yuefeng Huang, Kairui Mao, Xi Chen, Ming-An Sun, Takeshi Kawabe, Weizhe Li, Nicholas Usher, Jinfang Zhu, Joseph F Urban, William E Paul, Ronald N Germain
Innate lymphoid cells (ILCs) are innate counterparts of adaptive T lymphocytes, contributing to host defense, tissue repair, metabolic homeostasis, and inflammatory diseases. ILCs have been considered to be tissue-resident cells, but whether ILCs move between tissue sites during infection has been unclear. We show here that interleukin-25- or helminth-induced inflammatory ILC2s are circulating cells that arise from resting ILC2s residing in intestinal lamina propria. They migrate to diverse tissues based on sphingosine 1-phosphate (S1P)-mediated chemotaxis that promotes lymphatic entry, blood circulation, and accumulation in peripheral sites, including the lung, where they contribute to anti-helminth defense and tissue repair...
January 5, 2018: Science
Harikesh S Wong, Ronald N Germain
The adaptive immune system continually faces unpredictable circumstances yet reproducibly counteracts invading pathogens while limiting damage to self. However, the system is dynamic in nature: many of its internal components are not fixed, but rather, fluctuate over time. This concept is exemplified by αβ T lymphocytes, which vary significantly from cell-to-cell in their spatiotemporal dynamics, antigen-binding receptors, and subcellular protein concentrations. How are reproducible immune functions achieved in the face of such variability? This design principle is known as robustness and requires the system to employ layered control schemes that both buffer and exploit different facets of cellular variation...
December 29, 2017: Seminars in Immunology
Caren E Petrie Aronin, Yun M Zhao, Justine S Yoon, Nicole Y Morgan, Thorsten Prüstel, Ronald N Germain, Martin Meier-Schellersheim
Chemoattractant-mediated recruitment of hematopoietic cells to sites of pathogen growth or tissue damage is critical to host defense and organ homeostasis. Chemotaxis is typically considered to rely on spatial sensing, with cells following concentration gradients as long as these are present. Utilizing a microfluidic approach, we found that stable gradients of intermediate chemokines (CCL19 and CXCL12) failed to promote persistent directional migration of dendritic cells or neutrophils. Instead, rising chemokine concentrations were needed, implying that temporal sensing mechanisms controlled prolonged responses to these ligands...
November 21, 2017: Immunity
Ronald N Germain
A dichotomy exists in the field of vaccinology about the promise versus the hype associated with application of "systems biology" approaches to rational vaccine design. Some feel it is the only way to efficiently uncover currently unknown parameters controlling desired immune responses or discover what elements actually mediate these responses. Others feel that traditional experimental, often reductionist, methods for incrementally unraveling complex biology provide a more solid way forward, and that "systems" approaches are costly ways to collect data without gaining true insight...
October 16, 2017: Cold Spring Harbor Perspectives in Biology
Weizhe Li, Ronald N Germain, Michael Y Gerner
Organ homeostasis, cellular differentiation, signal relay, and in situ function all depend on the spatial organization of cells in complex tissues. For this reason, comprehensive, high-resolution mapping of cell positioning, phenotypic identity, and functional state in the context of macroscale tissue structure is critical to a deeper understanding of diverse biological processes. Here we report an easy to use method, clearing-enhanced 3D (Ce3D), which generates excellent tissue transparency for most organs, preserves cellular morphology and protein fluorescence, and is robustly compatible with antibody-based immunolabeling...
August 29, 2017: Proceedings of the National Academy of Sciences of the United States of America
Takeshi Kawabe, Dragana Jankovic, Shuko Kawabe, Yuefeng Huang, Ping-Hsien Lee, Hidehiro Yamane, Jinfang Zhu, Alan Sher, Ronald N Germain, William E Paul
Conventional CD4(+) T cells are composed of naïve, pathogen-specific memory, and pathogen-independent memory-phenotype (MP) cells under steady state. Naïve and pathogen-specific memory cells play key roles in adaptive immunity, whereas the homeostatic mechanisms regulating the generation of MP cells and their biological functions are unclear. We show that MP cells are autonomously generated from peripheral naïve cells in the absence of infectious stimulation in a T cell receptor (TCR)- and CD28-dependent manner...
June 16, 2017: Science Immunology
Masashi Watanabe, Chiharu Fujihara, Andrea J Radtke, Y Jeffrey Chiang, Sumeena Bhatia, Ronald N Germain, Richard J Hodes
T cell-dependent germinal center (GC) responses require coordinated interactions of T cells with two antigen-presenting cell (APC) populations, B cells and dendritic cells (DCs), in the presence of B7- and CD40-dependent co-stimulatory pathways. Contrary to the prevailing paradigm, we found unique cellular requirements for B7 and CD40 expression in primary GC responses to vaccine immunization with protein antigen and adjuvant: B7 was required on DCs but was not required on B cells, whereas CD40 was required on B cells but not on DCs in the generation of antigen-specific follicular helper T cells, antigen-specific GC B cells, and high-affinity class-switched antibody production...
September 4, 2017: Journal of Experimental Medicine
Allison Tong, John Gill, Klemens Budde, Lorna Marson, Peter P Reese, David Rosenbloom, Lionel Rostaing, Germaine Wong, Michelle A Josephson, Timothy L Pruett, Anthony N Warrens, Jonathan C Craig, Benedicte Sautenet, Nicole Evangelidis, Angelique F Ralph, Camilla S Hanson, Jenny I Shen, Kirsten Howard, Klemens Meyer, Ronald D Perrone, Daniel E Weiner, Samuel Fung, Maggie K M Ma, Caren Rose, Jessica Ryan, Ling-Xin Chen, Martin Howell, Nicholas Larkins, Siah Kim, Sobhana Thangaraju, Angela Ju, Jeremy R Chapman
BACKGROUND: Treatment decisions in kidney transplantation requires patients and clinicians to weigh the benefits and harms of a broad range of medical and surgical interventions, but the heterogeneity and lack of patient-relevant outcomes across trials in transplantation makes these trade-offs uncertain, thus, the need for a core outcome set that reflects stakeholder priorities. METHODS: We convened 2 international Standardized Outcomes in Nephrology-Kidney Transplantation stakeholder consensus workshops in Boston (17 patients/caregivers; 52 health professionals) and Hong Kong (10 patients/caregivers; 45 health professionals)...
August 2017: Transplantation
Alon Oyler-Yaniv, Jennifer Oyler-Yaniv, Benjamin M Whitlock, Zhiduo Liu, Ronald N Germain, Morgan Huse, Grégoire Altan-Bonnet, Oleg Krichevsky
Immune cells communicate by exchanging cytokines to achieve a context-appropriate response, but the distances over which such communication happens are not known. Here, we used theoretical considerations and experimental models of immune responses in vitro and in vivo to quantify the spatial extent of cytokine communications in dense tissues. We established that competition between cytokine diffusion and consumption generated spatial niches of high cytokine concentrations with sharp boundaries. The size of these self-assembled niches scaled with the density of cytokine-consuming cells, a parameter that gets tuned during immune responses...
April 18, 2017: Immunity
Tibor Z Veres, Tamás Kopcsányi, Marko Tirri, Armin Braun, Masayuki Miyasaka, Ronald N Germain, Sirpa Jalkanen, Marko Salmi
The mucosal layer of conducting airways is the primary tissue exposed to inhaled microorganisms, allergens and pollutants. We developed an in vivo two-photon microscopic approach that allows performing dynamic imaging studies in the mouse trachea, which is a commonly used in vivo model of human small-diameter bronchi. By providing stabilized access to the tracheal mucosa without intubation, our setup uniquely allows dynamic in vivo imaging of mucociliary clearance and steady-state immune cell behavior within the complex airway mucosal tissue...
April 6, 2017: Scientific Reports
Anna Brewitz, Sarah Eickhoff, Sabrina Dähling, Thomas Quast, Sammy Bedoui, Richard A Kroczek, Christian Kurts, Natalio Garbi, Winfried Barchet, Matteo Iannacone, Frederick Klauschen, Waldemar Kolanus, Tsuneyasu Kaisho, Marco Colonna, Ronald N Germain, Wolfgang Kastenmüller
Adaptive cellular immunity is initiated by antigen-specific interactions between T lymphocytes and dendritic cells (DCs). Plasmacytoid DCs (pDCs) support antiviral immunity by linking innate and adaptive immune responses. Here we examined pDC spatiotemporal dynamics during viral infection to uncover when, where, and how they exert their functions. We found that pDCs accumulated at sites of CD8(+) T cell antigen-driven activation in a CCR5-dependent fashion. Furthermore, activated CD8(+) T cells orchestrated the local recruitment of lymph node-resident XCR1 chemokine receptor-expressing DCs via secretion of the XCL1 chemokine...
February 21, 2017: Immunity
Andrew G Levine, Saskia Hemmers, Antonio P Baptista, Michail Schizas, Mehlika B Faire, Bruno Moltedo, Catherine Konopacki, Marc Schmidt-Supprian, Ronald N Germain, Piper M Treuting, Alexander Y Rudensky
The regulatory T cell (T reg cell) T cell receptor (TCR) repertoire is highly diverse and skewed toward recognition of self-antigens. TCR expression by T reg cells is continuously required for maintenance of immune tolerance and for a major part of their characteristic gene expression signature; however, it remains unknown to what degree diverse TCR-mediated interactions with cognate self-antigens are required for these processes. In this study, by experimentally switching the T reg cell TCR repertoire to a single T reg cell TCR, we demonstrate that T reg cell function and gene expression can be partially uncoupled from TCR diversity...
March 6, 2017: Journal of Experimental Medicine
Constantinos Petrovas, Sara Ferrando-Martinez, Michael Y Gerner, Joseph P Casazza, Amarendra Pegu, Claire Deleage, Arik Cooper, Jason Hataye, Sarah Andrews, David Ambrozak, Perla M Del Río Estrada, Eli Boritz, Robert Paris, Eirini Moysi, Kristin L Boswell, Ezequiel Ruiz-Mateos, Ilias Vagios, Manuel Leal, Yuria Ablanedo-Terrazas, Amaranta Rivero, Luz Alicia Gonzalez-Hernandez, Adrian B McDermott, Susan Moir, Gustavo Reyes-Terán, Fernando Docobo, Giuseppe Pantaleo, Daniel C Douek, Michael R Betts, Jacob D Estes, Ronald N Germain, John R Mascola, Richard A Koup
Cytolytic CD8 T cells play a crucial role in the control and elimination of virus-infected cells and are a major focus of HIV cure efforts. However, it has been shown that HIV-specific CD8 T cells are infrequently found within germinal centers (GCs), a predominant site of active and latent HIV infection. We demonstrate that HIV infection induces marked changes in the phenotype, frequency, and localization of CD8 T cells within the lymph node (LN). Significantly increased frequencies of CD8 T cells in the B cell follicles and GCs were found in LNs from treated and untreated HIV-infected individuals...
January 18, 2017: Science Translational Medicine
Andrea J Radtke, Charles F Anderson, Nicolas Riteau, Kelly Rausch, Puthupparampil Scaria, Emily R Kelnhofer, Randall F Howard, Alan Sher, Ronald N Germain, Patrick Duffy
Humoral immune responses have the potential to maintain protective antibody levels for years due to the immunoglobulin-secreting activity of long-lived plasma cells (LLPCs). However, many subunit vaccines under development fail to generate robust LLPC responses, and therefore a variety of strategies are being employed to overcome this limitation, including conjugation to carrier proteins and/or formulation with potent adjuvants. Pfs25, an antigen expressed on malaria zygotes and ookinetes, is a leading transmission blocking vaccine (TBV) candidate for Plasmodium falciparum...
January 16, 2017: Scientific Reports
Tibor Z Veres, Tamás Kopcsányi, Nicholas van Panhuys, Michael Y Gerner, Zhiduo Liu, Pia Rantakari, Johannes Dunkel, Masayuki Miyasaka, Marko Salmi, Sirpa Jalkanen, Ronald N Germain
Allergic asthma develops in the mucosal tissue of small bronchi. At these sites, local cytokine production by Th2/Th17 cells is believed to be critical for the development of tissue eosinophilia/neutrophilia. Using the mouse trachea as a relevant model of human small airways, we performed advanced in vivo dynamic and in situ static imaging to visualize individual cytokine-producing T cells in the airway mucosa and to define their immediate cellular environment. Upon allergen sensitization, newly recruited CD4(+) T cells formed discrete Ag-driven clusters with dendritic cells (DCs)...
January 15, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
Georg B Ehret, Teresa Ferreira, Daniel I Chasman, Anne U Jackson, Ellen M Schmidt, Toby Johnson, Gudmar Thorleifsson, Jian'an Luan, Lousie A Donnelly, Stavroula Kanoni, Ann-Kristin Petersen, Vasyl Pihur, Rona J Strawbridge, Dmitry Shungin, Maria F Hughes, Osorio Meirelles, Marika Kaakinen, Nabila Bouatia-Naji, Kati Kristiansson, Sonia Shah, Marcus E Kleber, Xiuqing Guo, Leo-Pekka Lyytikäinen, Cristiano Fava, Niclas Eriksson, Ilja M Nolte, Patrik K Magnusson, Elias L Salfati, Loukianos S Rallidis, Elizabeth Theusch, Andrew J P Smith, Lasse Folkersen, Kate Witkowska, Tune H Pers, Roby Joehanes, Stuart K Kim, Lazaros Lataniotis, Rick Jansen, Andrew D Johnson, Helen Warren, Young Jin Kim, Wei Zhao, Ying Wu, Bamidele O Tayo, Murielle Bochud, Devin Absher, Linda S Adair, Najaf Amin, Dan E Arking, Tomas Axelsson, Damiano Baldassarre, Beverley Balkau, Stefania Bandinelli, Michael R Barnes, Inês Barroso, Stephen Bevan, Joshua C Bis, Gyda Bjornsdottir, Michael Boehnke, Eric Boerwinkle, Lori L Bonnycastle, Dorret I Boomsma, Stefan R Bornstein, Morris J Brown, Michel Burnier, Claudia P Cabrera, John C Chambers, I-Shou Chang, Ching-Yu Cheng, Peter S Chines, Ren-Hua Chung, Francis S Collins, John M Connell, Angela Döring, Jean Dallongeville, John Danesh, Ulf de Faire, Graciela Delgado, Anna F Dominiczak, Alex S F Doney, Fotios Drenos, Sarah Edkins, John D Eicher, Roberto Elosua, Stefan Enroth, Jeanette Erdmann, Per Eriksson, Tonu Esko, Evangelos Evangelou, Alun Evans, Tove Fall, Martin Farrall, Janine F Felix, Jean Ferrières, Luigi Ferrucci, Myriam Fornage, Terrence Forrester, Nora Franceschini, Oscar H Franco Duran, Anders Franco-Cereceda, Ross M Fraser, Santhi K Ganesh, He Gao, Karl Gertow, Francesco Gianfagna, Bruna Gigante, Franco Giulianini, Anuj Goel, Alison H Goodall, Mark O Goodarzi, Mathias Gorski, Jürgen Gräßler, Christopher Groves, Vilmundur Gudnason, Ulf Gyllensten, Göran Hallmans, Anna-Liisa Hartikainen, Maija Hassinen, Aki S Havulinna, Caroline Hayward, Serge Hercberg, Karl-Heinz Herzig, Andrew A Hicks, Aroon D Hingorani, Joel N Hirschhorn, Albert Hofman, Jostein Holmen, Oddgeir Lingaas Holmen, Jouke-Jan Hottenga, Phil Howard, Chao A Hsiung, Steven C Hunt, M Arfan Ikram, Thomas Illig, Carlos Iribarren, Richard A Jensen, Mika Kähönen, Hyun Kang, Sekar Kathiresan, Brendan J Keating, Kay-Tee Khaw, Yun Kyoung Kim, Eric Kim, Mika Kivimaki, Norman Klopp, Genovefa Kolovou, Pirjo Komulainen, Jaspal S Kooner, Gulum Kosova, Ronald M Krauss, Diana Kuh, Zoltan Kutalik, Johanna Kuusisto, Kirsti Kvaløy, Timo A Lakka, Nanette R Lee, I-Te Lee, Wen-Jane Lee, Daniel Levy, Xiaohui Li, Kae-Woei Liang, Honghuang Lin, Li Lin, Jaana Lindström, Stéphane Lobbens, Satu Männistö, Gabriele Müller, Martina Müller-Nurasyid, François Mach, Hugh S Markus, Eirini Marouli, Mark I McCarthy, Colin A McKenzie, Pierre Meneton, Cristina Menni, Andres Metspalu, Vladan Mijatovic, Leena Moilanen, May E Montasser, Andrew D Morris, Alanna C Morrison, Antonella Mulas, Ramaiah Nagaraja, Narisu Narisu, Kjell Nikus, Christopher J O'Donnell, Paul F O'Reilly, Ken K Ong, Fred Paccaud, Cameron D Palmer, Afshin Parsa, Nancy L Pedersen, Brenda W Penninx, Markus Perola, Annette Peters, Neil Poulter, Peter P Pramstaller, Bruce M Psaty, Thomas Quertermous, Dabeeru C Rao, Asif Rasheed, N William N W R Rayner, Frida Renström, Rainer Rettig, Kenneth M Rice, Robert Roberts, Lynda M Rose, Jacques Rossouw, Nilesh J Samani, Serena Sanna, Jouko Saramies, Heribert Schunkert, Sylvain Sebert, Wayne H-H Sheu, Young-Ah Shin, Xueling Sim, Johannes H Smit, Albert V Smith, Maria X Sosa, Tim D Spector, Alena Stančáková, Alice Stanton, Kathleen E Stirrups, Heather M Stringham, Johan Sundstrom, Amy J Swift, Ann-Christine Syvänen, E-Shyong Tai, Toshiko Tanaka, Kirill V Tarasov, Alexander Teumer, Unnur Thorsteinsdottir, Martin D Tobin, Elena Tremoli, Andre G Uitterlinden, Matti Uusitupa, Ahmad Vaez, Dhananjay Vaidya, Cornelia M van Duijn, Erik P A van Iperen, Ramachandran S Vasan, Germaine C Verwoert, Jarmo Virtamo, Veronique Vitart, Benjamin F Voight, Peter Vollenweider, Aline Wagner, Louise V Wain, Nicholas J Wareham, Hugh Watkins, Alan B Weder, Harm-Jan Westra, Rainford Wilks, Tom Wilsgaard, James F Wilson, Tien Y Wong, Tsun-Po Yang, Jie Yao, Loic Yengo, Weihua Zhang, Jing Hua Zhao, Xiaofeng Zhu, Pascal Bovet, Richard S Cooper, Karen L Mohlke, Danish Saleheen, Jong-Young Lee, Paul Elliott, Hinco J Gierman, Cristen J Willer, Lude Franke, G Kees Hovingh, Kent D Taylor, George Dedoussis, Peter Sever, Andrew Wong, Lars Lind, Themistocles L Assimes, Inger Njølstad, Peter Eh Schwarz, Claudia Langenberg, Harold Snieder, Mark J Caulfield, Olle Melander, Markku Laakso, Juha Saltevo, Rainer Rauramaa, Jaakko Tuomilehto, Erik Ingelsson, Terho Lehtimäki, Kristian Hveem, Walter Palmas, Winfried März, Meena Kumari, Veikko Salomaa, Yii-Der I Chen, Jerome I Rotter, Philippe Froguel, Marjo-Riitta Jarvelin, Edward G Lakatta, Kari Kuulasmaa, Paul W Franks, Anders Hamsten, H-Erich Wichmann, Colin N A Palmer, Kari Stefansson, Paul M Ridker, Ruth J F Loos, Aravinda Chakravarti, Panos Deloukas, Andrew P Morris, Christopher Newton-Cheh, Patricia B Munroe
To dissect the genetic architecture of blood pressure and assess effects on target organ damage, we analyzed 128,272 SNPs from targeted and genome-wide arrays in 201,529 individuals of European ancestry, and genotypes from an additional 140,886 individuals were used for validation. We identified 66 blood pressure-associated loci, of which 17 were new; 15 harbored multiple distinct association signals. The 66 index SNPs were enriched for cis-regulatory elements, particularly in vascular endothelial cells, consistent with a primary role in blood pressure control through modulation of vascular tone across multiple tissues...
October 2016: Nature Genetics
Se Jin Im, Masao Hashimoto, Michael Y Gerner, Junghwa Lee, Haydn T Kissick, Matheus C Burger, Qiang Shan, J Scott Hale, Judong Lee, Tahseen H Nasti, Arlene H Sharpe, Gordon J Freeman, Ronald N Germain, Helder I Nakaya, Hai-Hui Xue, Rafi Ahmed
Chronic viral infections are characterized by a state of CD8+ T-cell dysfunction that is associated with expression of the programmed cell death 1 (PD-1) inhibitory receptor. A better understanding of the mechanisms that regulate CD8+ T-cell responses during chronic infection is required to improve immunotherapies that restore function in exhausted CD8+ T cells. Here we identify a population of virus-specific CD8+ T cells that proliferate after blockade of the PD-1 inhibitory pathway in mice chronically infected with lymphocytic choriomeningitis virus (LCMV)...
September 15, 2016: Nature
Rachel A Gottschalk, Andrew J Martins, Bastian R Angermann, Bhaskar Dutta, Caleb E Ng, Stefan Uderhardt, John S Tsang, Iain D C Fraser, Martin Meier-Schellersheim, Ronald N Germain
The innate immune system distinguishes low-level homeostatic microbial stimuli from those of invasive pathogens, yet we lack understanding of how qualitatively similar microbial products yield context-specific macrophage functional responses. Using quantitative approaches, we found that NF-κB and MAPK signaling was activated at different concentrations of a stimulatory TLR4 ligand in both mouse and human macrophages. Above a threshold of ligand, MAPK were activated in a switch-like manner, facilitating production of inflammatory mediators...
June 22, 2016: Cell Systems
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