13 research outputs found

    Bacterial Toxins as Pathogen Weapons Against Phagocytes

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    Bacterial toxins are virulence factors that manipulate host cell functions and take over the control of vital processes of living organisms to favor microbial infection. Some toxins directly target innate immune cells, thereby annihilating a major branch of the host immune response. In this review we will focus on bacterial toxins that act from the extracellular milieu and hinder the function of macrophages and neutrophils. In particular, we will concentrate on toxins from Gram-positive and Gram-negative bacteria that manipulate cell signaling or induce cell death by either imposing direct damage to the host cells cytoplasmic membrane or enzymatically modifying key eukaryotic targets. Outcomes regarding pathogen dissemination, host damage and disease progression will be discussed.This work was supported by FEDER funds through Programa Operational Factores de Competitividade - COMPETE and by national funds through FCT - Fundacao para a Ciencia e a Tecnologia (project PTDC/BIA-MIC/3463/2012 FCOMP-01-0124-FEDER-028364; to AV). Research in the groups of Molecular Microbiology and Fish Immunology and Vaccinology is supported by national funds through FCT Fundacao para Ciencia e a Tecnologia/MEC - Ministerio da Educacao e Ciencia and co-funded by FEDER within the partnership agreement: PT2020 related with the research unit number 4293. The Group of Molecular Microbiology also receives support from a Research Grant 2014 by the European Society of Clinical Microbiology and Infectious Diseases (ESCMID) (to SS) and the PT2020 research project Infect-ERA/0001/2013 PROANTILIS. AdV received the FCT fellowship SFRH/BPD/95777/2013 by national funds through FCT - Fundacao para a Ciencia e a Tecnologia/MEC - Ministerio da Educacao e Ciencia and co-funded by QREN and POPH (Programa Operational Potential Humano). SS is supported by FCT-Investigator program

    High Resolution Mass Spectrometry (HRMS) Based Investigation of Small Molecule, Bioactive Secondary Metabolites as Probes in the Examination of Bacterial Resistance and Virulence

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    The widespread availability of antimicrobial chemotherapeutics over the last half of the twentieth century has offered dramatic increases in life expectancy. Unfortunately, many pathogenic agents are exhibiting ever increasing resistance to many frontline antibiotics. New chemotherapeutic agents are urgently needed to combat this threat; this work seeks to illustrate applications in which mass spectrometric techniques may be applied to the investigation of novel, small molecule chemotherapeutics for the treatment of bacterial infections. Chapter 1 contains an introduction to mass spectrometry, as well as an overview of relevant chromatographic techniques. Chapter 2 introduces the bacterium F tularensis and M ulcerans and details the MS based investigation of their secreted virulence factors. Chapter 3 introduces a human pathogen of particular concern, M tuberculosis, and contains a detailed reporting on the MS based investigation of internally synthesized compounds for the treatment of latent Tb

    Guidelines for the use and interpretation of assays for monitoring autophagy (4th edition)

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    Guidelines for the use and interpretation of assays for monitoring autophagy (4th edition)

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    This work was supported by the National Institute of General Medical Sciences [GM131919].In 2008, we published the first set of guidelines for standardizing research in autophagy. Since then, this topic has received increasing attention, and many scientists have entered the field. Our knowledge base and relevant new technologies have also been expanding. Thus, it is important to formulate on a regular basis updated guidelines for monitoring autophagy in different organisms. Despite numerous reviews, there continues to be confusion regarding acceptable methods to evaluate autophagy, especially in multicellular eukaryotes. Here, we present a set of guidelines for investigators to select and interpret methods to examine autophagy and related processes, and for reviewers to provide realistic and reasonable critiques of reports that are focused on these processes. These guidelines are not meant to be a dogmatic set of rules, because the appropriateness of any assay largely depends on the question being asked and the system being used. Moreover, no individual assay is perfect for every situation, calling for the use of multiple techniques to properly monitor autophagy in each experimental setting. Finally, several core components of the autophagy machinery have been implicated in distinct autophagic processes (canonical and noncanonical autophagy), implying that genetic approaches to block autophagy should rely on targeting two or more autophagy-related genes that ideally participate in distinct steps of the pathway. Along similar lines, because multiple proteins involved in autophagy also regulate other cellular pathways including apoptosis, not all of them can be used as a specific marker for bona fide autophagic responses. Here, we critically discuss current methods of assessing autophagy and the information they can, or cannot, provide. Our ultimate goal is to encourage intellectual and technical innovation in the field.PostprintPeer reviewe

    Guidelines for the use and interpretation of assays for monitoring autophagy (4th edition)

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    none2929siIn 2008, we published the first set of guidelines for standardizing research in autophagy. Since then, this topic has received increasing attention, and many scientists have entered the field. Our knowledge base and relevant new technologies have also been expanding. Thus, it is important to formulate on a regular basis updated guidelines for monitoring autophagy in different organisms. Despite numerous reviews, there continues to be confusion regarding acceptable methods to evaluate autophagy, especially in multicellular eukaryotes. Here, we present a set of guidelines for investigators to select and interpret methods to examine autophagy and related processes, and for reviewers to provide realistic and reasonable critiques of reports that are focused on these processes. These guidelines are not meant to be a dogmatic set of rules, because the appropriateness of any assay largely depends on the question being asked and the system being used. Moreover, no individual assay is perfect for every situation, calling for the use of multiple techniques to properly monitor autophagy in each experimental setting. Finally, several core components of the autophagy machinery have been implicated in distinct autophagic processes (canonical and noncanonical autophagy), implying that genetic approaches to block autophagy should rely on targeting two or more autophagy-related genes that ideally participate in distinct steps of the pathway. Along similar lines, because multiple proteins involved in autophagy also regulate other cellular pathways including apoptosis, not all of them can be used as a specific marker for bona fide autophagic responses. Here, we critically discuss current methods of assessing autophagy and the information they can, or cannot, provide. Our ultimate goal is to encourage intellectual and technical innovation in the field.openKlionsky, Daniel J; Abdel-Aziz, Amal Kamal; Abdelfatah, Sara; Abdellatif, Mahmoud; Abdoli, Asghar; Abel, Steffen; Abeliovich, Hagai; Abildgaard, Marie H; Abudu, Yakubu Princely; Acevedo-Arozena, Abraham; Adamopoulos, Iannis E; Adeli, Khosrow; Adolph, Timon E; Adornetto, Annagrazia; Aflaki, Elma; Agam, Galila; Agarwal, Anupam; Aggarwal, Bharat B; Agnello, Maria; Agostinis, Patrizia; Agrewala, Javed N; Agrotis, Alexander; Aguilar, Patricia V; Ahmad, S Tariq; Ahmed, Zubair M; Ahumada-Castro, Ulises; Aits, Sonja; Aizawa, Shu; Akkoc, Yunus; Akoumianaki, Tonia; Akpinar, Hafize Aysin; Al-Abd, Ahmed M; Al-Akra, Lina; Al-Gharaibeh, Abeer; Alaoui-Jamali, Moulay A; Alberti, Simon; Alcocer-GĂłmez, ElĂ­sabet; Alessandri, Cristiano; Ali, Muhammad; Alim Al-Bari, M Abdul; Aliwaini, Saeb; Alizadeh, Javad; Almacellas, EugĂšnia; Almasan, Alexandru; Alonso, Alicia; Alonso, Guillermo D; Altan-Bonnet, Nihal; Altieri, Dario C; Álvarez, Élida M C; Alves, Sara; Alves da Costa, Cristine; Alzaharna, Mazen M; Amadio, Marialaura; Amantini, Consuelo; Amaral, Cristina; Ambrosio, Susanna; Amer, Amal O; Ammanathan, Veena; An, Zhenyi; Andersen, Stig U; Andrabi, Shaida A; Andrade-Silva, Magaiver; Andres, Allen M; Angelini, Sabrina; Ann, David; Anozie, Uche C; Ansari, Mohammad Y; Antas, Pedro; Antebi, Adam; AntĂłn, Zuriñe; Anwar, Tahira; Apetoh, Lionel; Apostolova, Nadezda; Araki, Toshiyuki; Araki, Yasuhiro; Arasaki, Kohei; AraĂșjo, Wagner L; Araya, Jun; Arden, Catherine; ArĂ©valo, Maria-Angeles; Arguelles, Sandro; Arias, Esperanza; Arikkath, Jyothi; Arimoto, Hirokazu; Ariosa, Aileen R; Armstrong-James, Darius; ArnaunĂ©-Pelloquin, Laetitia; Aroca, Angeles; Arroyo, Daniela S; Arsov, Ivica; Artero, RubĂ©n; Asaro, Dalia Maria Lucia; Aschner, Michael; Ashrafizadeh, Milad; Ashur-Fabian, Osnat; Atanasov, Atanas G; Au, Alicia K; Auberger, Patrick; Auner, Holger W; Aurelian, Laure; Autelli, Riccardo; Avagliano, Laura; Ávalos, Yenniffer; Aveic, Sanja; Aveleira, CĂ©lia Alexandra; Avin-Wittenberg, Tamar; Aydin, Yucel; Ayton, Scott; Ayyadevara, Srinivas; Azzopardi, Maria; Baba, Misuzu; Backer, Jonathan M; Backues, Steven K; Bae, Dong-Hun; Bae, Ok-Nam; Bae, Soo Han; Baehrecke, Eric H; Baek, Ahruem; Baek, Seung-Hoon; Baek, Sung Hee; Bagetta, Giacinto; Bagniewska-Zadworna, Agnieszka; Bai, Hua; Bai, Jie; Bai, Xiyuan; Bai, Yidong; Bairagi, Nandadulal; Baksi, Shounak; Balbi, Teresa; Baldari, Cosima T; Balduini, Walter; Ballabio, Andrea; Ballester, Maria; Balazadeh, Salma; Balzan, Rena; Bandopadhyay, Rina; Banerjee, Sreeparna; Banerjee, Sulagna; BĂĄnrĂ©ti, Ágnes; Bao, Yan; Baptista, Mauricio S; Baracca, Alessandra; Barbati, Cristiana; Bargiela, Ariadna; BarilĂ , Daniela; Barlow, Peter G; Barmada, Sami J; Barreiro, Esther; Barreto, George E; Bartek, Jiri; Bartel, Bonnie; Bartolome, Alberto; Barve, Gaurav R; Basagoudanavar, Suresh H; Bassham, Diane C; Bast, Robert C; Basu, Alakananda; Batoko, Henri; Batten, Isabella; Baulieu, Etienne E; Baumgarner, Bradley L; Bayry, Jagadeesh; Beale, Rupert; Beau, Isabelle; Beaumatin, Florian; Bechara, Luiz R G; Beck, George R; Beers, Michael F; Begun, Jakob; Behrends, Christian; Behrens, Georg M N; Bei, Roberto; Bejarano, Eloy; Bel, Shai; Behl, Christian; Belaid, Amine; Belgareh-TouzĂ©, NaĂŻma; Bellarosa, Cristina; Belleudi, Francesca; BellĂł PĂ©rez, Melissa; Bello-Morales, Raquel; Beltran, Jackeline Soares de Oliveira; Beltran, SebastiĂĄn; Benbrook, Doris Mangiaracina; Bendorius, Mykolas; Benitez, Bruno A; Benito-Cuesta, Irene; Bensalem, Julien; Berchtold, Martin W; Berezowska, Sabina; Bergamaschi, Daniele; Bergami, Matteo; Bergmann, Andreas; Berliocchi, Laura; Berlioz-Torrent, Clarisse; Bernard, AmĂ©lie; Berthoux, Lionel; Besirli, Cagri G; Besteiro, Sebastien; Betin, Virginie M; Beyaert, Rudi; Bezbradica, Jelena S; Bhaskar, Kiran; Bhatia-Kissova, Ingrid; Bhattacharya, Resham; Bhattacharya, Sujoy; Bhattacharyya, Shalmoli; Bhuiyan, Md Shenuarin; Bhutia, Sujit Kumar; Bi, Lanrong; Bi, Xiaolin; Biden, Trevor J; Bijian, Krikor; Billes, Viktor A; Binart, Nadine; Bincoletto, Claudia; Birgisdottir, Asa B; Bjorkoy, Geir; Blanco, Gonzalo; Blas-Garcia, Ana; Blasiak, Janusz; Blomgran, Robert; Blomgren, Klas; Blum, Janice S; Boada-Romero, Emilio; Boban, Mirta; Boesze-Battaglia, Kathleen; Boeuf, Philippe; Boland, Barry; Bomont, Pascale; Bonaldo, Paolo; Bonam, Srinivasa Reddy; Bonfili, Laura; Bonifacino, Juan S; Boone, Brian A; Bootman, Martin D; Bordi, Matteo; Borner, Christoph; Bornhauser, Beat C; Borthakur, Gautam; Bosch, JĂŒrgen; Bose, Santanu; Botana, Luis M; Botas, Juan; Boulanger, Chantal M; Boulton, Michael E; Bourdenx, Mathieu; Bourgeois, Benjamin; Bourke, Nollaig M; Bousquet, Guilhem; Boya, Patricia; Bozhkov, Peter V; Bozi, Luiz H M; Bozkurt, Tolga O; Brackney, Doug E; Brandts, Christian H; Braun, Ralf J; Braus, Gerhard H; Bravo-Sagua, Roberto; Bravo-San Pedro, JosĂ© M; Brest, Patrick; Bringer, Marie-AgnĂšs; Briones-Herrera, Alfredo; Broaddus, V Courtney; Brodersen, Peter; Brodsky, Jeffrey L; Brody, Steven L; Bronson, Paola G; Bronstein, Jeff M; Brown, Carolyn N; Brown, Rhoderick E; Brum, Patricia C; Brumell, John H; Brunetti-Pierri, Nicola; Bruno, Daniele; Bryson-Richardson, Robert J; Bucci, Cecilia; Buchrieser, Carmen; Bueno, Marta; Buitrago-Molina, Laura Elisa; Buraschi, Simone; Buch, Shilpa; Buchan, J Ross; Buckingham, Erin M; Budak, Hikmet; Budini, Mauricio; Bultynck, Geert; Burada, Florin; Burgoyne, Joseph R; BurĂłn, M Isabel; Bustos, Victor; BĂŒttner, Sabrina; Butturini, Elena; Byrd, Aaron; Cabas, Isabel; Cabrera-Benitez, Sandra; Cadwell, Ken; Cai, Jingjing; Cai, Lu; Cai, Qian; CairĂł, Montserrat; Calbet, Jose A; Caldwell, Guy A; Caldwell, Kim A; Call, Jarrod A; Calvani, Riccardo; Calvo, Ana C; Calvo-Rubio Barrera, Miguel; Camara, Niels Os; Camonis, Jacques H; Camougrand, Nadine; Campanella, Michelangelo; Campbell, Edward M; Campbell-Valois, François-Xavier; Campello, Silvia; Campesi, Ilaria; Campos, Juliane C; Camuzard, Olivier; Cancino, Jorge; Candido de Almeida, Danilo; Canesi, Laura; Caniggia, Isabella; Canonico, Barbara; CantĂ­, Carles; Cao, Bin; Caraglia, Michele; CaramĂ©s, Beatriz; Carchman, Evie H; Cardenal-Muñoz, Elena; Cardenas, Cesar; Cardenas, Luis; Cardoso, Sandra M; Carew, Jennifer S; Carle, Georges F; Carleton, Gillian; Carloni, Silvia; Carmona-Gutierrez, Didac; Carneiro, Leticia A; Carnevali, Oliana; Carosi, Julian M; Carra, Serena; Carrier, Alice; Carrier, Lucie; Carroll, Bernadette; Carter, A Brent; Carvalho, Andreia Neves; Casanova, Magali; Casas, Caty; Casas, Josefina; Cassioli, Chiara; Castillo, Eliseo F; Castillo, Karen; Castillo-Lluva, Sonia; Castoldi, Francesca; Castori, Marco; Castro, Ariel F; Castro-Caldas, Margarida; Castro-Hernandez, Javier; Castro-Obregon, Susana; Catz, Sergio D; Cavadas, Claudia; Cavaliere, Federica; Cavallini, Gabriella; Cavinato, Maria; Cayuela, Maria L; Cebollada Rica, Paula; Cecarini, Valentina; Cecconi, Francesco; Cechowska-Pasko, Marzanna; Cenci, Simone; Ceperuelo-MallafrĂ©, VictĂČria; Cerqueira, JoĂŁo J; Cerutti, Janete M; Cervia, Davide; Cetintas, Vildan Bozok; Cetrullo, Silvia; Chae, Han-Jung; Chagin, Andrei S; Chai, Chee-Yin; Chakrabarti, Gopal; Chakrabarti, Oishee; Chakraborty, Tapas; Chakraborty, Trinad; Chami, Mounia; Chamilos, Georgios; Chan, David W; Chan, Edmond Y W; Chan, Edward D; Chan, H Y Edwin; Chan, Helen H; Chan, Hung; Chan, Matthew T V; Chan, Yau Sang; Chandra, Partha K; Chang, Chih-Peng; Chang, Chunmei; Chang, Hao-Chun; Chang, Kai; Chao, Jie; Chapman, Tracey; Charlet-Berguerand, Nicolas; Chatterjee, Samrat; Chaube, Shail K; Chaudhary, Anu; Chauhan, Santosh; Chaum, Edward; Checler, FrĂ©dĂ©ric; Cheetham, Michael E; Chen, Chang-Shi; Chen, Guang-Chao; Chen, Jian-Fu; Chen, Liam L; Chen, Leilei; Chen, Lin; Chen, Mingliang; Chen, Mu-Kuan; Chen, Ning; Chen, Quan; Chen, Ruey-Hwa; Chen, Shi; Chen, Wei; Chen, Weiqiang; Chen, Xin-Ming; Chen, Xiong-Wen; Chen, Xu; Chen, Yan; Chen, Ye-Guang; Chen, Yingyu; Chen, Yongqiang; Chen, Yu-Jen; Chen, Yue-Qin; Chen, Zhefan Stephen; Chen, Zhi; Chen, Zhi-Hua; Chen, Zhijian J; Chen, Zhixiang; Cheng, Hanhua; Cheng, Jun; Cheng, Shi-Yuan; Cheng, Wei; Cheng, Xiaodong; Cheng, Xiu-Tang; Cheng, Yiyun; Cheng, Zhiyong; Chen, Zhong; Cheong, Heesun; Cheong, Jit Kong; Chernyak, Boris V; Cherry, Sara; Cheung, Chi Fai Randy; Cheung, Chun Hei Antonio; Cheung, King-Ho; Chevet, Eric; Chi, Richard J; Chiang, Alan Kwok Shing; Chiaradonna, Ferdinando; Chiarelli, Roberto; Chiariello, Mario; Chica, Nathalia; Chiocca, Susanna; Chiong, Mario; Chiou, Shih-Hwa; Chiramel, Abhilash I; ChiurchiĂč, Valerio; Cho, Dong-Hyung; Choe, Seong-Kyu; Choi, Augustine M K; Choi, Mary E; Choudhury, Kamalika Roy; Chow, Norman S; Chu, Charleen T; Chua, Jason P; Chua, John Jia En; Chung, Hyewon; Chung, Kin Pan; Chung, Seockhoon; Chung, So-Hyang; Chung, Yuen-Li; Cianfanelli, Valentina; Ciechomska, Iwona A; Cifuentes, Mariana; Cinque, Laura; Cirak, Sebahattin; Cirone, Mara; Clague, Michael J; Clarke, Robert; Clementi, Emilio; Coccia, Eliana M; Codogno, Patrice; Cohen, Ehud; Cohen, Mickael M; Colasanti, Tania; Colasuonno, Fiorella; Colbert, Robert A; Colell, Anna; Čolić, Miodrag; Coll, Nuria S; Collins, Mark O; Colombo, MarĂ­a I; ColĂłn-Ramos, Daniel A; Combaret, Lydie; Comincini, Sergio; Cominetti, MĂĄrcia R; Consiglio, Antonella; Conte, Andrea; Conti, Fabrizio; Contu, Viorica Raluca; Cookson, Mark R; Coombs, Kevin M; Coppens, Isabelle; Corasaniti, Maria Tiziana; Corkery, Dale P; Cordes, Nils; Cortese, Katia; Costa, Maria do Carmo; Costantino, Sarah; Costelli, Paola; Coto-Montes, Ana; Crack, Peter J; Crespo, Jose L; Criollo, Alfredo; Crippa, Valeria; Cristofani, Riccardo; Csizmadia, Tamas; Cuadrado, Antonio; Cui, Bing; Cui, Jun; Cui, Yixian; Cui, Yong; Culetto, Emmanuel; Cumino, Andrea C; Cybulsky, Andrey V; Czaja, Mark J; Czuczwar, Stanislaw J; D'Adamo, Stefania; D'Amelio, Marcello; D'Arcangelo, Daniela; D'Lugos, Andrew C; D'Orazi, Gabriella; da Silva, James A; Dafsari, Hormos Salimi; Dagda, Ruben K; Dagdas, Yasin; Daglia, Maria; Dai, Xiaoxia; Dai, Yun; Dai, Yuyuan; Dal Col, Jessica; Dalhaimer, Paul; Dalla Valle, Luisa; Dallenga, Tobias; Dalmasso, Guillaume; Damme, Markus; Dando, Ilaria; Dantuma, Nico P; Darling, April L; Das, Hiranmoy; Dasarathy, Srinivasan; Dasari, Santosh K; Dash, Srikanta; Daumke, Oliver; Dauphinee, Adrian N; Davies, Jeffrey S; DĂĄvila, Valeria A; Davis, Roger J; Davis, Tanja; Dayalan Naidu, Sharadha; De Amicis, Francesca; De Bosscher, Karolien; De Felice, Francesca; De Franceschi, Lucia; De Leonibus, Chiara; de Mattos Barbosa, Mayara G; De Meyer, Guido R Y; De Milito, Angelo; De Nunzio, Cosimo; De Palma, Clara; De Santi, Mauro; De Virgilio, Claudio; De Zio, Daniela; Debnath, Jayanta; DeBosch, Brian J; Decuypere, Jean-Paul; Deehan, Mark A; Deflorian, Gianluca; DeGregori, James; Dehay, Benjamin; Del Rio, Gabriel; Delaney, Joe R; Delbridge, Lea M D; Delorme-Axford, Elizabeth; Delpino, M Victoria; Demarchi, Francesca; Dembitz, Vilma; Demers, Nicholas D; Deng, Hongbin; Deng, Zhiqiang; Dengjel, Joern; Dent, Paul; Denton, Donna; DePamphilis, Melvin L; Der, Channing J; Deretic, Vojo; Descoteaux, Albert; Devis, Laura; Devkota, Sushil; Devuyst, Olivier; Dewson, Grant; Dharmasivam, Mahendiran; Dhiman, Rohan; di Bernardo, Diego; Di Cristina, Manlio; Di Domenico, Fabio; Di Fazio, Pietro; Di Fonzo, Alessio; Di Guardo, Giovanni; Di Guglielmo, Gianni M; Di Leo, Luca; Di Malta, Chiara; Di Nardo, Alessia; Di Rienzo, Martina; Di Sano, Federica; Diallinas, George; Diao, Jiajie; Diaz-Araya, Guillermo; DĂ­az-Laviada, InĂ©s; Dickinson, Jared M; Diederich, Marc; DieudĂ©, MĂ©lanie; Dikic, Ivan; Ding, Shiping; Ding, Wen-Xing; Dini, Luciana; Dinić, Jelena; Dinic, Miroslav; Dinkova-Kostova, Albena T; Dionne, Marc S; Distler, Jörg H W; Diwan, Abhinav; Dixon, Ian M C; Djavaheri-Mergny, Mojgan; Dobrinski, Ina; Dobrovinskaya, Oxana; Dobrowolski, Radek; Dobson, Renwick C J; Đokić, Jelena; Dokmeci Emre, Serap; Donadelli, Massimo; Dong, Bo; Dong, Xiaonan; Dong, Zhiwu; Dorn Ii, Gerald W; Dotsch, Volker; Dou, Huan; Dou, Juan; Dowaidar, Moataz; Dridi, Sami; Drucker, Liat; Du, Ailian; Du, Caigan; Du, Guangwei; Du, Hai-Ning; Du, Li-Lin; du Toit, AndrĂ©; Duan, Shao-Bin; Duan, Xiaoqiong; Duarte, SĂłnia P; Dubrovska, Anna; Dunlop, Elaine A; Dupont, Nicolas; DurĂĄn, RaĂșl V; Dwarakanath, Bilikere S; Dyshlovoy, Sergey A; Ebrahimi-Fakhari, Darius; Eckhart, Leopold; Edelstein, Charles L; Efferth, Thomas; Eftekharpour, Eftekhar; Eichinger, Ludwig; Eid, Nabil; Eisenberg, Tobias; Eissa, N Tony; Eissa, Sanaa; Ejarque, Miriam; El Andaloussi, Abdeljabar; El-Hage, Nazira; El-Naggar, Shahenda; Eleuteri, Anna Maria; El-Shafey, Eman S; Elgendy, Mohamed; Eliopoulos, Aristides G; Elizalde, MarĂ­a M; Elks, Philip M; Elsasser, Hans-Peter; Elsherbiny, Eslam S; Emerling, Brooke M; Emre, N C Tolga; Eng, Christina H; Engedal, Nikolai; Engelbrecht, Anna-Mart; Engelsen, Agnete S T; Enserink, Jorrit M; Escalante, Ricardo; Esclatine, Audrey; Escobar-Henriques, Mafalda; Eskelinen, Eeva-Liisa; Espert, Lucile; Eusebio, Makandjou-Ola; Fabrias, Gemma; Fabrizi, Cinzia; Facchiano, Antonio; Facchiano, Francesco; Fadeel, Bengt; Fader, Claudio; Faesen, Alex C; Fairlie, W Douglas; FalcĂł, Alberto; Falkenburger, Bjorn H; Fan, Daping; Fan, Jie; Fan, Yanbo; Fang, Evandro F; Fang, Yanshan; Fang, Yognqi; Fanto, Manolis; Farfel-Becker, Tamar; Faure, Mathias; Fazeli, Gholamreza; Fedele, Anthony O; Feldman, Arthur M; Feng, Du; Feng, Jiachun; Feng, Lifeng; Feng, Yibin; Feng, Yuchen; Feng, Wei; Fenz Araujo, Thais; Ferguson, Thomas A; FernĂĄndez, Álvaro F; Fernandez-Checa, Jose C; FernĂĄndez-Veledo, Sonia; Fernie, Alisdair R; Ferrante, Anthony W; Ferraresi, Alessandra; Ferrari, Merari F; Ferreira, Julio C B; Ferro-Novick, Susan; Figueras, Antonio; Filadi, Riccardo; Filigheddu, Nicoletta; Filippi-Chiela, Eduardo; Filomeni, Giuseppe; Fimia, Gian Maria; Fineschi, Vittorio; Finetti, Francesca; Finkbeiner, Steven; Fisher, Edward A; Fisher, Paul B; Flamigni, Flavio; Fliesler, Steven J; Flo, Trude H; Florance, Ida; Florey, Oliver; Florio, Tullio; Fodor, Erika; Follo, Carlo; Fon, Edward A; Forlino, Antonella; Fornai, Francesco; Fortini, Paola; Fracassi, Anna; Fraldi, Alessandro; Franco, Brunella; Franco, Rodrigo; Franconi, Flavia; Frankel, Lisa B; Friedman, Scott L; Fröhlich, Leopold F; FrĂŒhbeck, Gema; Fuentes, Jose M; Fujiki, Yukio; Fujita, Naonobu; Fujiwara, Yuuki; Fukuda, Mitsunori; Fulda, Simone; Furic, Luc; Furuya, Norihiko; Fusco, Carmela; Gack, Michaela U; Gaffke, Lidia; Galadari, Sehamuddin; Galasso, Alessia; Galindo, Maria F; Gallolu Kankanamalage, Sachith; Galluzzi, Lorenzo; Galy, Vincent; Gammoh, Noor; Gan, Boyi; Ganley, Ian G; Gao, Feng; Gao, Hui; Gao, Minghui; Gao, Ping; Gao, Shou-Jiang; Gao, Wentao; Gao, Xiaobo; Garcera, Ana; Garcia, Maria NoĂ©; Garcia, VerĂłnica E; GarcĂ­a-Del Portillo, Francisco; Garcia-Escudero, Vega; Garcia-Garcia, Aracely; Garcia-Macia, Marina; GarcĂ­a-Moreno, Diana; Garcia-Ruiz, Carmen; GarcĂ­a-Sanz, Patricia; Garg, Abhishek D; Gargini, Ricardo; Garofalo, Tina; Garry, Robert F; Gassen, Nils C; Gatica, Damian; Ge, Liang; Ge, Wanzhong; Geiss-Friedlander, Ruth; Gelfi, Cecilia; Genschik, Pascal; Gentle, Ian E; Gerbino, Valeria; Gerhardt, Christoph; Germain, Kyla; Germain, Marc; Gewirtz, David A; Ghasemipour Afshar, Elham; Ghavami, Saeid; Ghigo, Alessandra; Ghosh, Manosij; Giamas, Georgios; Giampietri, Claudia; Giatromanolaki, Alexandra; Gibson, Gary E; Gibson, Spencer B; Ginet, Vanessa; Giniger, Edward; Giorgi, Carlotta; Girao, Henrique; Girardin, Stephen E; Giridharan, Mridhula; Giuliano, Sandy; Giulivi, Cecilia; Giuriato, Sylvie; Giustiniani, Julien; Gluschko, Alexander; Goder, Veit; Goginashvili, Alexander; Golab, Jakub; Goldstone, David C; Golebiewska, Anna; Gomes, Luciana R; Gomez, Rodrigo; GĂłmez-SĂĄnchez, RubĂ©n; Gomez-Puerto, Maria Catalina; Gomez-Sintes, Raquel; Gong, Qingqiu; Goni, Felix M; GonzĂĄlez-Gallego, Javier; Gonzalez-Hernandez, Tomas; Gonzalez-Polo, Rosa A; Gonzalez-Reyes, Jose A; GonzĂĄlez-RodrĂ­guez, Patricia; Goping, Ing Swie; Gorbatyuk, Marina S; Gorbunov, Nikolai V; GörgĂŒlĂŒ, Kıvanç; Gorojod, Roxana M; Gorski, Sharon M; Goruppi, Sandro; Gotor, Cecilia; Gottlieb, Roberta A; Gozes, Illana; Gozuacik, Devrim; Graef, Martin; GrĂ€ler, Markus H; Granatiero, Veronica; Grasso, Daniel; Gray, Joshua P; Green, Douglas R; Greenhough, Alexander; Gregory, Stephen L; Griffin, Edward F; Grinstaff, Mark W; Gros, Frederic; Grose, Charles; Gross, Angelina S; Gruber, Florian; Grumati, Paolo; Grune, Tilman; Gu, Xueyan; Guan, Jun-Lin; Guardia, Carlos M; Guda, Kishore; Guerra, Flora; Guerri, Consuelo; Guha, Prasun; GuillĂ©n, Carlos; Gujar, Shashi; Gukovskaya, Anna; Gukovsky, Ilya; Gunst, Jan; GĂŒnther, Andreas; Guntur, Anyonya R; Guo, Chuanyong; Guo, Chun; Guo, Hongqing; Guo, Lian-Wang; Guo, Ming; Gupta, Pawan; Gupta, Shashi Kumar; Gupta, Swapnil; Gupta, Veer Bala; Gupta, Vivek; Gustafsson, Asa B; Gutterman, David D; H B, Ranjitha; Haapasalo, Annakaisa; Haber, James E; Hać, Aleksandra; Hadano, Shinji; HafrĂ©n, Anders J; Haidar, Mansour; Hall, Belinda S; HalldĂ©n, Gunnel; Hamacher-Brady, Anne; Hamann, Andrea; Hamasaki, Maho; Han, Weidong; Hansen, Malene; Hanson, Phyllis I; Hao, Zijian; Harada, Masaru; Harhaji-Trajkovic, Ljubica; Hariharan, Nirmala; Haroon, Nigil; Harris, James; Hasegawa, Takafumi; Hasima Nagoor, Noor; Haspel, Jeffrey A; Haucke, Volker; Hawkins, Wayne D; Hay, Bruce A; Haynes, Cole M; Hayrabedyan, Soren B; Hays, Thomas S; He, Congcong; He, Qin; He, Rong-Rong; He, You-Wen; He, Yu-Ying; Heakal, Yasser; Heberle, Alexander M; Hejtmancik, J Fielding; Helgason, Gudmundur Vignir; Henkel, Vanessa; Herb, Marc; Hergovich, Alexander; Herman-Antosiewicz, Anna; HernĂĄndez, AgustĂ­n; Hernandez, Carlos; Hernandez-Diaz, Sergio; Hernandez-Gea, Virginia; Herpin, Amaury; Herreros, Judit; HervĂĄs, Javier H; Hesselson, Daniel; Hetz, Claudio; Heussler, Volker T; Higuchi, Yujiro; Hilfiker, Sabine; Hill, Joseph A; Hlavacek, William S; Ho, Emmanuel A; Ho, Idy H T; Ho, Philip Wing-Lok; Ho, Shu-Leong; Ho, Wan Yun; Hobbs, G Aaron; Hochstrasser, Mark; Hoet, Peter H M; Hofius, Daniel; Hofman, Paul; 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    Guidelines for the use and interpretation of assays for monitoring autophagy (4th edition)1.

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    In 2008, we published the first set of guidelines for standardizing research in autophagy. Since then, this topic has received increasing attention, and many scientists have entered the field. Our knowledge base and relevant new technologies have also been expanding. Thus, it is important to formulate on a regular basis updated guidelines for monitoring autophagy in different organisms. Despite numerous reviews, there continues to be confusion regarding acceptable methods to evaluate autophagy, especially in multicellular eukaryotes. Here, we present a set of guidelines for investigators to select and interpret methods to examine autophagy and related processes, and for reviewers to provide realistic and reasonable critiques of reports that are focused on these processes. These guidelines are not meant to be a dogmatic set of rules, because the appropriateness of any assay largely depends on the question being asked and the system being used. Moreover, no individual assay is perfect for every situation, calling for the use of multiple techniques to properly monitor autophagy in each experimental setting. Finally, several core components of the autophagy machinery have been implicated in distinct autophagic processes (canonical and noncanonical autophagy), implying that genetic approaches to block autophagy should rely on targeting two or more autophagy-related genes that ideally participate in distinct steps of the pathway. Along similar lines, because multiple proteins involved in autophagy also regulate other cellular pathways including apoptosis, not all of them can be used as a specific marker for bona fide autophagic responses. Here, we critically discuss current methods of assessing autophagy and the information they can, or cannot, provide. Our ultimate goal is to encourage intellectual and technical innovation in the field

    Guidelines for the use and interpretation of assays for monitoring autophagy (4th edition)

    Get PDF
    none2929sĂŹIn 2008, we published the first set of guidelines for standardizing research in autophagy. Since then, this topic has received increasing attention, and many scientists have entered the field. Our knowledge base and relevant new technologies have also been expanding. Thus, it is important to formulate on a regular basis updated guidelines for monitoring autophagy in different organisms. Despite numerous reviews, there continues to be confusion regarding acceptable methods to evaluate autophagy, especially in multicellular eukaryotes. Here, we present a set of guidelines for investigators to select and interpret methods to examine autophagy and related processes, and for reviewers to provide realistic and reasonable critiques of reports that are focused on these processes. These guidelines are not meant to be a dogmatic set of rules, because the appropriateness of any assay largely depends on the question being asked and the system being used. Moreover, no individual assay is perfect for every situation, calling for the use of multiple techniques to properly monitor autophagy in each experimental setting. Finally, several core components of the autophagy machinery have been implicated in distinct autophagic processes (canonical and noncanonical autophagy), implying that genetic approaches to block autophagy should rely on targeting two or more autophagy-related genes that ideally participate in distinct steps of the pathway. Along similar lines, because multiple proteins involved in autophagy also regulate other cellular pathways including apoptosis, not all of them can be used as a specific marker for bona fide autophagic responses. Here, we critically discuss current methods of assessing autophagy and the information they can, or cannot, provide. Our ultimate goal is to encourage intellectual and technical innovation in the field.openKlionsky, Daniel J; Abdel-Aziz, Amal Kamal; Abdelfatah, Sara; Abdellatif, Mahmoud; Abdoli, Asghar; Abel, Steffen; Abeliovich, Hagai; Abildgaard, Marie H; Abudu, Yakubu Princely; Acevedo-Arozena, Abraham; Adamopoulos, Iannis E; Adeli, Khosrow; Adolph, Timon E; Adornetto, Annagrazia; Aflaki, Elma; Agam, Galila; Agarwal, Anupam; Aggarwal, Bharat B; Agnello, Maria; Agostinis, Patrizia; Agrewala, Javed N; Agrotis, Alexander; Aguilar, Patricia V; Ahmad, S Tariq; Ahmed, Zubair M; Ahumada-Castro, Ulises; Aits, Sonja; Aizawa, Shu; Akkoc, Yunus; Akoumianaki, Tonia; Akpinar, Hafize Aysin; Al-Abd, Ahmed M; Al-Akra, Lina; Al-Gharaibeh, Abeer; Alaoui-Jamali, Moulay A; Alberti, Simon; Alcocer-GĂłmez, ElĂ­sabet; Alessandri, Cristiano; Ali, Muhammad; Alim Al-Bari, M Abdul; Aliwaini, Saeb; Alizadeh, Javad; Almacellas, EugĂšnia; Almasan, Alexandru; Alonso, Alicia; Alonso, Guillermo D; Altan-Bonnet, Nihal; Altieri, Dario C; Álvarez, Élida M C; Alves, Sara; Alves da Costa, Cristine; Alzaharna, Mazen M; Amadio, Marialaura; Amantini, Consuelo; Amaral, Cristina; Ambrosio, Susanna; Amer, Amal O; Ammanathan, Veena; An, Zhenyi; Andersen, Stig U; Andrabi, Shaida A; Andrade-Silva, Magaiver; Andres, Allen M; Angelini, Sabrina; Ann, David; Anozie, Uche C; Ansari, Mohammad Y; Antas, Pedro; Antebi, Adam; AntĂłn, Zuriñe; Anwar, Tahira; Apetoh, Lionel; Apostolova, Nadezda; Araki, Toshiyuki; Araki, Yasuhiro; Arasaki, Kohei; AraĂșjo, Wagner L; Araya, Jun; Arden, Catherine; ArĂ©valo, Maria-Angeles; Arguelles, Sandro; Arias, Esperanza; Arikkath, Jyothi; Arimoto, Hirokazu; Ariosa, Aileen R; Armstrong-James, Darius; ArnaunĂ©-Pelloquin, Laetitia; Aroca, Angeles; Arroyo, Daniela S; Arsov, Ivica; Artero, RubĂ©n; Asaro, Dalia Maria Lucia; Aschner, Michael; Ashrafizadeh, Milad; Ashur-Fabian, Osnat; Atanasov, Atanas G; Au, Alicia K; Auberger, Patrick; Auner, Holger W; Aurelian, Laure; Autelli, Riccardo; Avagliano, Laura; Ávalos, Yenniffer; Aveic, Sanja; Aveleira, CĂ©lia Alexandra; Avin-Wittenberg, Tamar; Aydin, Yucel; Ayton, Scott; Ayyadevara, Srinivas; Azzopardi, Maria; Baba, Misuzu; Backer, Jonathan M; Backues, Steven K; Bae, Dong-Hun; Bae, Ok-Nam; Bae, Soo Han; Baehrecke, Eric H; Baek, Ahruem; Baek, Seung-Hoon; Baek, Sung Hee; Bagetta, Giacinto; Bagniewska-Zadworna, Agnieszka; Bai, Hua; Bai, Jie; Bai, Xiyuan; Bai, Yidong; Bairagi, Nandadulal; Baksi, Shounak; Balbi, Teresa; Baldari, Cosima T; Balduini, Walter; Ballabio, Andrea; Ballester, Maria; Balazadeh, Salma; Balzan, Rena; Bandopadhyay, Rina; Banerjee, Sreeparna; Banerjee, Sulagna; BĂĄnrĂ©ti, Ágnes; Bao, Yan; Baptista, Mauricio S; Baracca, Alessandra; Barbati, Cristiana; Bargiela, Ariadna; BarilĂ , Daniela; Barlow, Peter G; Barmada, Sami J; Barreiro, Esther; Barreto, George E; Bartek, Jiri; Bartel, Bonnie; Bartolome, Alberto; Barve, Gaurav R; Basagoudanavar, Suresh H; Bassham, Diane C; Bast, Robert C; Basu, Alakananda; Batoko, Henri; Batten, Isabella; Baulieu, Etienne E; Baumgarner, Bradley L; Bayry, Jagadeesh; Beale, Rupert; Beau, Isabelle; Beaumatin, Florian; Bechara, Luiz R G; Beck, George R; Beers, Michael F; Begun, Jakob; Behrends, Christian; Behrens, Georg M N; Bei, Roberto; Bejarano, Eloy; Bel, Shai; Behl, Christian; Belaid, Amine; Belgareh-TouzĂ©, NaĂŻma; Bellarosa, Cristina; Belleudi, Francesca; BellĂł PĂ©rez, Melissa; Bello-Morales, Raquel; Beltran, Jackeline Soares de Oliveira; Beltran, SebastiĂĄn; Benbrook, Doris Mangiaracina; Bendorius, Mykolas; Benitez, Bruno A; Benito-Cuesta, Irene; Bensalem, Julien; Berchtold, Martin W; Berezowska, Sabina; Bergamaschi, Daniele; Bergami, Matteo; Bergmann, Andreas; Berliocchi, Laura; Berlioz-Torrent, Clarisse; Bernard, AmĂ©lie; Berthoux, Lionel; Besirli, Cagri G; Besteiro, Sebastien; Betin, Virginie M; Beyaert, Rudi; Bezbradica, Jelena S; Bhaskar, Kiran; Bhatia-Kissova, Ingrid; Bhattacharya, Resham; Bhattacharya, Sujoy; Bhattacharyya, Shalmoli; Bhuiyan, Md Shenuarin; Bhutia, Sujit Kumar; Bi, Lanrong; Bi, Xiaolin; Biden, Trevor J; Bijian, Krikor; Billes, Viktor A; Binart, Nadine; Bincoletto, Claudia; Birgisdottir, Asa B; Bjorkoy, Geir; Blanco, Gonzalo; Blas-Garcia, Ana; Blasiak, Janusz; Blomgran, Robert; Blomgren, Klas; Blum, Janice S; Boada-Romero, Emilio; Boban, Mirta; Boesze-Battaglia, Kathleen; Boeuf, Philippe; Boland, Barry; Bomont, Pascale; Bonaldo, Paolo; Bonam, Srinivasa Reddy; Bonfili, Laura; Bonifacino, Juan S; Boone, Brian A; Bootman, Martin D; Bordi, Matteo; Borner, Christoph; Bornhauser, Beat C; Borthakur, Gautam; Bosch, JĂŒrgen; Bose, Santanu; Botana, Luis M; Botas, Juan; Boulanger, Chantal M; Boulton, Michael E; Bourdenx, Mathieu; Bourgeois, Benjamin; Bourke, Nollaig M; Bousquet, Guilhem; Boya, Patricia; Bozhkov, Peter V; Bozi, Luiz H M; Bozkurt, Tolga O; Brackney, Doug E; Brandts, Christian H; Braun, Ralf J; Braus, Gerhard H; Bravo-Sagua, Roberto; Bravo-San Pedro, JosĂ© M; Brest, Patrick; Bringer, Marie-AgnĂšs; Briones-Herrera, Alfredo; Broaddus, V Courtney; Brodersen, Peter; Brodsky, Jeffrey L; Brody, Steven L; Bronson, Paola G; Bronstein, Jeff M; Brown, Carolyn N; Brown, Rhoderick E; Brum, Patricia C; Brumell, John H; Brunetti-Pierri, Nicola; Bruno, Daniele; Bryson-Richardson, Robert J; Bucci, Cecilia; Buchrieser, Carmen; Bueno, Marta; Buitrago-Molina, Laura Elisa; Buraschi, Simone; Buch, Shilpa; Buchan, J Ross; Buckingham, Erin M; Budak, Hikmet; Budini, Mauricio; Bultynck, Geert; Burada, Florin; Burgoyne, Joseph R; BurĂłn, M Isabel; Bustos, Victor; BĂŒttner, Sabrina; Butturini, Elena; Byrd, Aaron; Cabas, Isabel; Cabrera-Benitez, Sandra; Cadwell, Ken; Cai, Jingjing; Cai, Lu; Cai, Qian; CairĂł, Montserrat; Calbet, Jose A; Caldwell, Guy A; Caldwell, Kim A; Call, Jarrod A; Calvani, Riccardo; Calvo, Ana C; Calvo-Rubio Barrera, Miguel; Camara, Niels Os; Camonis, Jacques H; Camougrand, Nadine; Campanella, Michelangelo; Campbell, Edward M; Campbell-Valois, François-Xavier; Campello, Silvia; Campesi, Ilaria; Campos, Juliane C; Camuzard, Olivier; Cancino, Jorge; Candido de Almeida, Danilo; Canesi, Laura; Caniggia, Isabella; Canonico, Barbara; CantĂ­, Carles; Cao, Bin; Caraglia, Michele; CaramĂ©s, Beatriz; Carchman, Evie H; Cardenal-Muñoz, Elena; Cardenas, Cesar; Cardenas, Luis; Cardoso, Sandra M; Carew, Jennifer S; Carle, Georges F; Carleton, Gillian; Carloni, Silvia; Carmona-Gutierrez, Didac; Carneiro, Leticia A; Carnevali, Oliana; Carosi, Julian M; Carra, Serena; Carrier, Alice; Carrier, Lucie; Carroll, Bernadette; Carter, A Brent; Carvalho, Andreia Neves; Casanova, Magali; Casas, Caty; Casas, Josefina; Cassioli, Chiara; Castillo, Eliseo F; Castillo, Karen; Castillo-Lluva, Sonia; Castoldi, Francesca; Castori, Marco; Castro, Ariel F; Castro-Caldas, Margarida; Castro-Hernandez, Javier; Castro-Obregon, Susana; Catz, Sergio D; Cavadas, Claudia; Cavaliere, Federica; Cavallini, Gabriella; Cavinato, Maria; Cayuela, Maria L; Cebollada Rica, Paula; Cecarini, Valentina; Cecconi, Francesco; Cechowska-Pasko, Marzanna; Cenci, Simone; Ceperuelo-MallafrĂ©, VictĂČria; Cerqueira, JoĂŁo J; Cerutti, Janete M; Cervia, Davide; Cetintas, Vildan Bozok; Cetrullo, Silvia; Chae, Han-Jung; Chagin, Andrei S; Chai, Chee-Yin; Chakrabarti, Gopal; Chakrabarti, Oishee; Chakraborty, Tapas; Chakraborty, Trinad; Chami, Mounia; Chamilos, Georgios; Chan, David W; Chan, Edmond Y W; Chan, Edward D; Chan, H Y Edwin; Chan, Helen H; Chan, Hung; Chan, Matthew T V; Chan, Yau Sang; Chandra, Partha K; Chang, Chih-Peng; Chang, Chunmei; Chang, Hao-Chun; Chang, Kai; Chao, Jie; Chapman, Tracey; Charlet-Berguerand, Nicolas; Chatterjee, Samrat; Chaube, Shail K; Chaudhary, Anu; Chauhan, Santosh; Chaum, Edward; Checler, FrĂ©dĂ©ric; Cheetham, Michael E; Chen, Chang-Shi; Chen, Guang-Chao; Chen, Jian-Fu; Chen, Liam L; Chen, Leilei; Chen, Lin; Chen, Mingliang; Chen, Mu-Kuan; Chen, Ning; Chen, Quan; Chen, Ruey-Hwa; Chen, Shi; Chen, Wei; Chen, Weiqiang; Chen, Xin-Ming; Chen, Xiong-Wen; Chen, Xu; Chen, Yan; Chen, Ye-Guang; Chen, Yingyu; Chen, Yongqiang; Chen, Yu-Jen; Chen, Yue-Qin; Chen, Zhefan Stephen; Chen, Zhi; 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Dai, Yuyuan; Dal Col, Jessica; Dalhaimer, Paul; Dalla Valle, Luisa; Dallenga, Tobias; Dalmasso, Guillaume; Damme, Markus; Dando, Ilaria; Dantuma, Nico P; Darling, April L; Das, Hiranmoy; Dasarathy, Srinivasan; Dasari, Santosh K; Dash, Srikanta; Daumke, Oliver; Dauphinee, Adrian N; Davies, Jeffrey S; DĂĄvila, Valeria A; Davis, Roger J; Davis, Tanja; Dayalan Naidu, Sharadha; De Amicis, Francesca; De Bosscher, Karolien; De Felice, Francesca; De Franceschi, Lucia; De Leonibus, Chiara; de Mattos Barbosa, Mayara G; De Meyer, Guido R Y; De Milito, Angelo; De Nunzio, Cosimo; De Palma, Clara; De Santi, Mauro; De Virgilio, Claudio; De Zio, Daniela; Debnath, Jayanta; DeBosch, Brian J; Decuypere, Jean-Paul; Deehan, Mark A; Deflorian, Gianluca; DeGregori, James; Dehay, Benjamin; Del Rio, Gabriel; Delaney, Joe R; Delbridge, Lea M D; Delorme-Axford, Elizabeth; Delpino, M Victoria; Demarchi, Francesca; Dembitz, Vilma; Demers, Nicholas D; Deng, Hongbin; Deng, Zhiqiang; Dengjel, Joern; Dent, Paul; Denton, Donna; 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    The regulation of L-selectin activity by proteolysis

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    L-selectin (CD62L) is a type I transmembrane protein expressed by lymphocytes which directs their migration from the bloodstream into lymph nodes and infected tissues. Stimulation of the T cell receptor (TCR) activates the enzyme A Disintegrin and Metalloproteinase 17 (ADAM 17), which cleaves L-selectin at the ectodomain generating a metalloproteinase product (MP product) comprising of a transmembrane region and a 17-amino acid intracellular domain (ICD). ϒ-secretase is a multi-subunit protease that cleaves up to 90 identified type I transmembrane proteins in the intramembrane region following ectodomain proteolysis by metalloproteinases. Presenilin (PS), the catalytic component of Îł-secretase is activated during an intramolecular cleavage called endoproteolysis separating the carboxy (C) and amino (N) termini. The catalytically active C-terminal fragment of PS then induces intramembrane proteolysis of substrates. The aim of my thesis was to firstly determine whether the MP product of L-selectin was a substrate for PS. Subsequently, I analysed whether stimulation of the TCR activates PS, inducing intramembrane proteolysis of the MP product releasing the ICD into the intracellular region. My data showed for the first time that in a resting T-cell, L-selectin forms a multi-component complex with both ADAM 17 and PS. TCR-activation induces ADAM 17 dependent proteolysis of L-selectin generating an MP product. Stimulation of the TCR also causes endoproteolysis of PS, where activated PS then cleaves the bound MP product. After PS cleavage, the released ICD was unstable and therefore difficult to detect, however I was able to block its formation using either PS inhibitor treatment or generating I351W mutated L-selectin, which was resistant to intramembrane proteolysis
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