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Eric pamer

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https://www.readbyqxmd.com/read/28951461/inflammatory-monocytes-promote-perineural-invasion-via-ccl2-mediated-recruitment-and-cathepsin-b-expression
#1
Richard L Bakst, Huizhong Xiong, Chun-Hao Chen, Sylvie Deborde, Anna Lyubchik, Yi Zhou, Shizhi He, William F McNamara, Sei-Young Lee, Oakley C Olson, Ingrid Leiner, Andrea R Marcadis, James W Keith, Hikmat A Al-Ahmadie, Nora Katabi, Ziv Gil, Efsevia Vakiani, Johanna A Joyce, Eric G Pamer, Richard J Wong
Perineural invasion (PNI) is an ominous event strongly linked to poor clinical outcome. Cells residing within peripheral nerves collaborate with cancer cells to enable PNI but the contributing conditions within the tumor microenvironment are not well understood. Here we show that CCR2-expressing inflammatory monocytes (IM) are preferentially recruited to sites of PNI, where they differentiate into macrophages and potentiate nerve invasion through a cathepsin B-mediated process. A series of adoptive transfer experiments with genetically engineered donors and recipients demonstrated that IM recruitment to nerves was driven by CCL2 released from Schwann cells at the site of PNI, but not CCL7, an alternate ligand for CCR2...
September 26, 2017: Cancer Research
https://www.readbyqxmd.com/read/28856737/the-intestinal-microbiota-antibiotics-colonization-resistance-and-enteric-pathogens
#2
REVIEW
Sohn Kim, April Covington, Eric G Pamer
The human gastrointestinal tract hosts a diverse network of microorganisms, collectively known as the microbiota that plays an important role in health and disease. For instance, the intestinal microbiota can prevent invading microbes from colonizing the gastrointestinal tract, a phenomenon known as colonization resistance. Perturbations to the microbiota, such as antibiotic administration, can alter microbial composition and result in the loss of colonization resistance. Consequently, the host may be rendered susceptible to colonization by a pathogen...
September 2017: Immunological Reviews
https://www.readbyqxmd.com/read/28790208/pathogenicity-locus-core-genome-and-accessory-gene-contributions-to-clostridium-difficile-virulence
#3
Brittany B Lewis, Rebecca A Carter, Lilan Ling, Ingrid Leiner, Ying Taur, Mini Kamboj, Erik R Dubberke, Joao Xavier, Eric G Pamer
Clostridium difficile is a spore-forming anaerobic bacterium that causes colitis in patients with disrupted colonic microbiota. While some individuals are asymptomatic C. difficile carriers, symptomatic disease ranges from mild diarrhea to potentially lethal toxic megacolon. The wide disease spectrum has been attributed to the infected host's age, underlying diseases, immune status, and microbiome composition. However, strain-specific differences in C. difficile virulence have also been implicated in determining colitis severity...
August 8, 2017: MBio
https://www.readbyqxmd.com/read/28762074/the-oral-microbiota-in-patients-with-pancreatic-cancer-patients-with-ipmns-and-controls-a-pilot-study
#4
Sara H Olson, Jaya Satagopan, Youming Xu, Lilan Ling, Siok Leong, Irene Orlow, Amethyst Saldia, Peter Li, Pamela Nunes, Vincent Madonia, Peter J Allen, Eileen O'Reilly, Eric Pamer, Robert C Kurtz
PURPOSE: Poor oral health appears to be a risk factor for pancreatic cancer, possibly implicating the oral microbiota. In this pilot study, we evaluated the characteristics of the oral microbiota in patients with pancreatic ductal adenocarcinoma (PDAC), intraductal papillary mucinous neoplasms (IPMN), and healthy controls. METHODS: Forty newly diagnosed PDAC patients, 39 IPMN patients, and 58 controls, excluding current smokers and users of antibiotics, provided saliva samples...
July 31, 2017: Cancer Causes & Control: CCC
https://www.readbyqxmd.com/read/28617651/microbiota-based-therapies-for-clostridium-difficile-and-antibiotic-resistant-enteric-infections
#5
Brittany B Lewis, Eric G Pamer
Bacterial pathogens are increasingly antibiotic resistant, and development of clinically effective antibiotics is lagging. Curing infections increasingly requires antimicrobials that are broader spectrum, more toxic, and more expensive, and mortality attributable to antibiotic-resistant pathogens is rising. The commensal microbiota, comprising microbes that colonize the mammalian gastrointestinal tract, can provide high levels of resistance to infection, and the contributions of specific bacterial species to resistance are being discovered and characterized...
September 8, 2017: Annual Review of Microbiology
https://www.readbyqxmd.com/read/28614303/bacterial-pathogens-a-spoonful-of-sugar-could-be-the-medicine
#6
COMMENT
Hea-Jin Jung, Eric G Pamer
No abstract text is available yet for this article.
June 22, 2017: Nature
https://www.readbyqxmd.com/read/28588016/commensal-microbes-provide-first-line-defense-against-listeria-monocytogenes-infection
#7
Simone Becattini, Eric R Littmann, Rebecca A Carter, Sohn G Kim, Sejal M Morjaria, Lilan Ling, Yangtsho Gyaltshen, Emily Fontana, Ying Taur, Ingrid M Leiner, Eric G Pamer
Listeria monocytogenes is a foodborne pathogen that causes septicemia, meningitis and chorioamnionitis and is associated with high mortality. Immunocompetent humans and animals, however, can tolerate high doses of L. monocytogenes without developing systemic disease. The intestinal microbiota provides colonization resistance against many orally acquired pathogens, and antibiotic-mediated depletion of the microbiota reduces host resistance to infection. Here we show that a diverse microbiota markedly reduces Listeria monocytogenes colonization of the gut lumen and prevents systemic dissemination...
July 3, 2017: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28498996/protective-factors-in-the-intestinal-microbiome-against-clostridium-difficile-infection-in-recipients-of-allogeneic-hematopoietic-stem-cell-transplantation
#8
Yeon Joo Lee, Esther S Arguello, Robert R Jenq, Eric Littmann, Grace J Kim, Liza C Miller, Lilan Ling, Cesar Figueroa, Elizabeth Robilotti, Miguel-Angel Perales, Juliet N Barker, Sergio Giralt, Marcel R M van den Brink, Eric G Pamer, Ying Taur
Background: Clostridium difficile infection (CDI) is a frequent complication in recipients of allogeneic hematopoietic stem cell transplantation (allo-HSCT), who receive intensive treatments that significantly disrupt the intestinal microbiota. In this study, we examined the microbiota composition of allo-HSCT recipients to identify bacterial colonizers that confer protection against CDI after engraftment. Methods: Feces collected from adult recipients allo-HSCT at engraftment were analyzed; 16S ribosomal RNA genes were sequenced and analyzed from each sample...
April 1, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28494240/cooperating-commensals-restore-colonization-resistance-to-vancomycin-resistant-enterococcus-faecium
#9
Silvia Caballero, Sohn Kim, Rebecca A Carter, Ingrid M Leiner, Bože Sušac, Liza Miller, Grace J Kim, Lilan Ling, Eric G Pamer
Antibiotic-mediated microbiota destruction and the consequent loss of colonization resistance can result in intestinal domination with vancomycin-resistant Enterococcus (VRE), leading to bloodstream infection in hospitalized patients. Clearance of VRE remains a challenging goal that, if achieved, would reduce systemic VRE infections and patient-to-patient transmission. Although obligate anaerobic commensal bacteria have been associated with colonization resistance to VRE, the specific bacterial species involved remain undefined...
May 10, 2017: Cell Host & Microbe
https://www.readbyqxmd.com/read/28372921/microbial-tuning-of-the-mammalian-immune-system
#10
Eric G Pamer
Bacterial species constituting the intestinal microbiota are implicated in maintenance of health but also pathogenesis of inflammatory disease. The compositional complexity of the microbiota and metabolic interdependencies of microbial species challenge our ability to attribute host responses to specific bacterial strains. Studies using gnotobiotic mice, however, are providing important insights.
May 2017: Trends in Molecular Medicine
https://www.readbyqxmd.com/read/28329030/protective-factors-in-the-intestinal-microbiome-against-clostridium-difficile-infection-in-recipients-of-allogeneic-hematopoietic-stem-cell-transplantation
#11
Yeon Joo Lee, Esther P Arguello, Robert R Jenq, Eric Littmann, Grace J Kim, Liza C Miller, Lilan Ling, Cesar Figueroa, Elizabeth Robilotti, Miguel-Angel Perales, Juliet N Barker, Sergio Giralt, Marcel R M van den Brink, Eric G Pamer, Ying Taur
Background: Clostridium difficile infection (CDI) is a frequent complication in recipients of allogeneic hematopoietic stem cell transplantation (allo-HSCT), who receive intensive treatments that significantly disrupt the intestinal microbiota. In this study, we examined the microbiota composition of allo-HSCT recipients to identify bacterial colonizers that confer protection against CDI following engraftment. Methods: Feces collected from adult recipients allo-HSCT at engraftment were analyzed; 16S rRNA genes were sequenced and analyzed from each sample...
January 30, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28296584/intestinal-microbiota-and-relapse-after-hematopoietic-cell-transplantation
#12
Jonathan U Peled, Sean M Devlin, Anna Staffas, Melissa Lumish, Raya Khanin, Eric R Littmann, Lilan Ling, Satyajit Kosuri, Molly Maloy, John B Slingerland, Katya F Ahr, Kori A Porosnicu Rodriguez, Yusuke Shono, Ann E Slingerland, Melissa D Docampo, Anthony D Sung, Daniela Weber, Amin M Alousi, Boglarka Gyurkocza, Doris M Ponce, Juliet N Barker, Miguel-Angel Perales, Sergio A Giralt, Ying Taur, Eric G Pamer, Robert R Jenq, Marcel R M van den Brink
Purpose The major causes of mortality after allogeneic hematopoietic-cell transplantation (allo-HCT) are relapse, graft-versus-host disease (GVHD), and infection. We have reported previously that alterations in the intestinal flora are associated with GVHD, bacteremia, and reduced overall survival after allo-HCT. Because intestinal bacteria are potent modulators of systemic immune responses, including antitumor effects, we hypothesized that components of the intestinal flora could be associated with relapse after allo-HCT...
May 20, 2017: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/27707993/short-and-long-term-effects-of-oral-vancomycin-on-the-human-intestinal-microbiota
#13
Sandrine Isaac, Jose U Scher, Ana Djukovic, Nuria Jiménez, Dan R Littman, Steven B Abramson, Eric G Pamer, Carles Ubeda
BACKGROUND: Oral vancomycin remains the mainstay of therapy for severe infections produced by Clostridium difficile, the most prevalent cause of healthcare-associated infectious diarrhoea in developed countries. However, its short- and long-term effects on the human intestinal microbiota remain largely unknown. METHODS: We utilized high-throughput sequencing to analyse the effects of vancomycin on the faecal human microbiota up to 22 weeks post-antibiotic cessation...
January 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/27573580/clostridium-difficile-colitis-pathogenesis-and-host-defence
#14
REVIEW
Michael C Abt, Peter T McKenney, Eric G Pamer
Clostridium difficile is a major cause of intestinal infection and diarrhoea in individuals following antibiotic treatment. Recent studies have begun to elucidate the mechanisms that induce spore formation and germination and have determined the roles of C. difficile toxins in disease pathogenesis. Exciting progress has also been made in defining the role of the microbiome, specific commensal bacterial species and host immunity in defence against infection with C. difficile. This Review will summarize the recent discoveries and developments in our understanding of C...
October 2016: Nature Reviews. Microbiology
https://www.readbyqxmd.com/read/27432344/celecoxib-alters-the-intestinal-microbiota-and-metabolome-in-association-with-reducing-polyp-burden
#15
David C Montrose, Xi Kathy Zhou, Erin M McNally, Erika Sue, Rhonda K Yantiss, Steven S Gross, Nitai D Leve, Edward D Karoly, Chen S Suen, Lilan Ling, Robert Benezra, Eric G Pamer, Andrew J Dannenberg
Treatment with celecoxib, a selective COX-2 inhibitor, reduces formation of premalignant adenomatous polyps in the gastrointestinal tracts of humans and mice. In addition to its chemopreventive activity, celecoxib can exhibit antimicrobial activity. Differing bacterial profiles have been found in feces from colon cancer patients compared with those of normal subjects. Moreover, preclinical studies suggest that bacteria can modulate intestinal tumorigenesis by secreting specific metabolites. In the current study, we determined whether celecoxib treatment altered the luminal microbiota and metabolome in association with reducing intestinal polyp burden in mice...
September 2016: Cancer Prevention Research
https://www.readbyqxmd.com/read/27241781/bile-acid-sensitivity-and-in%C3%A2-vivo-virulence-of-clinical-clostridium-difficile-isolates
#16
Brittany B Lewis, Rebecca A Carter, Eric G Pamer
Clostridium difficile is an anaerobic bacterium that causes diarrheal illnesses. Disease onset is linked with exposure to oral antibiotics and consequent depletion of secondary bile acids. Here we investigate the relationship between in vitro secondary bile acid tolerance and in vivo disease scores of diverse C. difficile strains in mice.
October 2016: Anaerobe
https://www.readbyqxmd.com/read/27198022/complete-genome-sequence-of-enterococcus-faecium-atcc-700221
#17
Peter T McKenney, Lilan Ling, Guilin Wang, Shrikant Mane, Eric G Pamer
We report the complete genome sequence of a vancomycin-resistant isolate of Enterococcus faecium derived from human feces. The genome comprises one chromosome of 2.9 Mb and three plasmids. The strain harbors a plasmid-borne vanA-type vancomycin resistance locus and is a member of multilocus sequencing type (MLST) cluster ST-17.
May 19, 2016: Genome Announcements
https://www.readbyqxmd.com/read/27194729/increased-gvhd-related-mortality-with-broad-spectrum-antibiotic-use-after-allogeneic-hematopoietic-stem-cell-transplantation-in-human-patients-and-mice
#18
Yusuke Shono, Melissa D Docampo, Jonathan U Peled, Suelen M Perobelli, Enrico Velardi, Jennifer J Tsai, Ann E Slingerland, Odette M Smith, Lauren F Young, Jyotsna Gupta, Sophia R Lieberman, Hillary V Jay, Katya F Ahr, Kori A Porosnicu Rodriguez, Ke Xu, Marco Calarfiore, Hendrik Poeck, Silvia Caballero, Sean M Devlin, Franck Rapaport, Jarrod A Dudakov, Alan M Hanash, Boglarka Gyurkocza, George F Murphy, Camilla Gomes, Chen Liu, Eli L Moss, Shannon B Falconer, Ami S Bhatt, Ying Taur, Eric G Pamer, Marcel R M van den Brink, Robert R Jenq
Intestinal bacteria may modulate the risk of infection and graft-versus-host disease (GVHD) after allogeneic hematopoietic stem cell transplantation (allo-HSCT). Allo-HSCT recipients often develop neutropenic fever, which is treated with antibiotics that may target anaerobic bacteria in the gut. We retrospectively examined 857 allo-HSCT recipients and found that treatment of neutropenic fever with imipenem-cilastatin and piperacillin-tazobactam antibiotics was associated with increased GVHD-related mortality at 5 years (21...
May 18, 2016: Science Translational Medicine
https://www.readbyqxmd.com/read/27178527/antibiotic-induced-changes-in-the-intestinal-microbiota-and-disease
#19
REVIEW
Simone Becattini, Ying Taur, Eric G Pamer
The gut microbiota is a key player in many physiological and pathological processes occurring in humans. Recent investigations suggest that the efficacy of some clinical approaches depends on the action of commensal bacteria. Antibiotics are invaluable weapons to fight infectious diseases. However, by altering the composition and functions of the microbiota, they can also produce long-lasting deleterious effects for the host. The emergence of multidrug-resistant pathogens raises concerns about the common, and at times inappropriate, use of antimicrobial agents...
June 2016: Trends in Molecular Medicine
https://www.readbyqxmd.com/read/27126035/resurrecting-the-intestinal-microbiota-to-combat-antibiotic-resistant-pathogens
#20
REVIEW
Eric G Pamer
The intestinal microbiota, which is composed of diverse populations of commensal bacterial species, provides resistance against colonization and invasion by pathogens. Antibiotic treatment can damage the intestinal microbiota and, paradoxically, increase susceptibility to infections. Reestablishing microbiota-mediated colonization resistance after antibiotic treatment could markedly reduce infections, particularly those caused by antibiotic-resistant bacteria. Ongoing studies are identifying commensal bacterial species that can be developed into next-generation probiotics to reestablish or enhance colonization resistance...
April 29, 2016: Science
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