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https://www.readbyqxmd.com/read/29756133/biology-of-teeth-and-implants-host-factors-pathology-regeneration-and-the-role-of-stem-cells
#1
F-Michael Eggert, Liran Levin
In chronic periodontitis and peri-implantitis, cells of the innate and adaptive immune systems are involved directly in the lesions within the tissues of the patient. Absence of a periodontal ligament around implants does not prevent a biologic process similar to that of periodontitis from affecting osseointegration. Our first focus is on factors in the biology of individuals that are responsible for the susceptibility of such individuals to chronic periodontitis and to peri-implantitis. Genetic factors are of significant importance in susceptibility to these diseases...
2018: Quintessence International
https://www.readbyqxmd.com/read/29706647/the-microbiome-and-autoimmunity-a-paradigm-from-the-gut-liver-axis
#2
REVIEW
Bo Li, Carlo Selmi, Ruqi Tang, M E Gershwin, Xiong Ma
Microbial cells significantly outnumber human cells in the body, and the microbial flora at mucosal sites are shaped by environmental factors and, less intuitively, act on host immune responses, as demonstrated by experimental data in germ-free and gnotobiotic studies. Our understanding of this link stems from the established connection between infectious bacteria and immune tolerance breakdown, as observed in rheumatic fever triggered by Streptococci via molecular mimicry, epitope spread and bystander effects...
April 30, 2018: Cellular & Molecular Immunology
https://www.readbyqxmd.com/read/29701691/paneth-cells-during-viral-infection-and-pathogenesis
#3
REVIEW
Mayumi K Holly, Jason G Smith
Paneth cells are major secretory cells located in the crypts of Lieberkühn in the small intestine. Our understanding of the diverse roles that Paneth cells play in homeostasis and disease has grown substantially since their discovery over a hundred years ago. Classically, Paneth cells have been characterized as a significant source of antimicrobial peptides and proteins important in host defense and shaping the composition of the commensal microbiota. More recently, Paneth cells have been shown to supply key developmental and homeostatic signals to intestinal stem cells in the crypt base...
April 26, 2018: Viruses
https://www.readbyqxmd.com/read/29675450/engineered-human-gastrointestinal-cultures-to-study-the-microbiome-and-infectious-diseases
#4
REVIEW
Sarah E Blutt, Sue E Crawford, Sasirekha Ramani, Winnie Y Zou, Mary K Estes
New models to study the intestine are key to understanding intestinal diseases and developing novel treatments. Intestinal organ-like culture systems (organoids and enteroids) have substantially advanced the study of the human gastrointestinal tract. Stem cell-derived cultures produce self-organizing structures that contain the multiple differentiated intestinal epithelial cell types including enterocytes, goblet, Paneth, and enteroendocrine cells. Understanding host-microbial interactions is one area in which these cultures are expediting major advancements...
March 2018: Cellular and Molecular Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/29666616/stem-cell-transcription-factor-foxo-controls-microbiome-resilience-in-hydra
#5
Benedikt M Mortzfeld, Jan Taubenheim, Sebastian Fraune, Alexander V Klimovich, Thomas C G Bosch
The aging process is considered to be the result of accumulating cellular deterioration in an individual organism over time. It can be affected by the combined influence of genetic, epigenetic, and environmental factors including life-style-associated events. In the non-senescent freshwater polyp Hydra , one of the classical model systems for evolutionary developmental biology and regeneration, transcription factor FoxO modulates both stem cell proliferation and innate immunity. This provides strong support for the role of FoxO as a critical rate-of-aging regulator...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29656244/human-organoid-cultures-transformative-new-tools-for-human-virus-studies
#6
REVIEW
Sasirekha Ramani, Sue E Crawford, Sarah E Blutt, Mary K Estes
Studies of human infectious diseases have been limited by the paucity of functional models that mimic normal human physiology and pathophysiology. Recent advances in the development of multicellular, physiologically active organotypic cultures produced from embryonic and pluripotent stem cells, as well as from stem cells isolated from biopsies and surgical specimens are allowing unprecedented new studies and discoveries about host-microbe interactions. Here, we summarize recent developments in the use of organoids for studying human viral pathogens, including intestinal infections with human rotavirus, norovirus, enteroviruses and adenoviruses (intestinal organoids and enteroids), neuronal infections with Zika virus (cerebral organoids) and respiratory infections with respiratory syncytial virus in (lung bud organoids)...
April 2018: Current Opinion in Virology
https://www.readbyqxmd.com/read/29556546/unraveling-interactions-between-the-microbiome-and-the-host-immune-system-to-decipher-mechanisms-of-disease
#7
Catherine A Lozupone
In recent years, there has been a deluge of papers linking altered microbiome compositions to a myriad of diseases. Mechanistic insight into microbial drivers of disease phenotypes is essential for translation to novel therapies. A key mechanism by which microbes influence health is immune modulation by components of their capsule and cell envelope and their metabolites. A major research focus of my laboratory is to gain mechanistic insight into which microbes modulate host immunity generally and in the context of disease...
March 2018: MSystems
https://www.readbyqxmd.com/read/29499056/nubbin-isoform-antagonism-governs-drosophila-intestinal-immune-homeostasis
#8
Bo G Lindberg, Xiongzhuo Tang, Widad Dantoft, Priya Gohel, Shiva Seyedoleslami Esfahani, Jessica M Lindvall, Ylva Engström
Gut immunity is regulated by intricate and dynamic mechanisms to ensure homeostasis despite a constantly changing microbial environment. Several regulatory factors have been described to participate in feedback responses to prevent aberrant immune activity. Little is, however, known about how transcriptional programs are directly tuned to efficiently adapt host gut tissues to the current microbiome. Here we show that the POU/Oct gene nubbin (nub) encodes two transcription factor isoforms, Nub-PB and Nub-PD, which antagonistically regulate immune gene expression in Drosophila...
March 2018: PLoS Pathogens
https://www.readbyqxmd.com/read/29471034/the-microbiome-and-hematopoietic-cell-transplantation-past-present-and-future
#9
Tessa M Andermann, Jonathan U Peled, Christine Ho, Pavan Reddy, Marcie Riches, Rainer Storb, Takanori Teshima, Marcel R M van den Brink, Amin Alousi, Sophia Balderman, Patrizia Chiusolo, William B Clark, Ernst Holler, Alan Howard, Leslie S Kean, Andrew Y Koh, Philip L McCarthy, John M McCarty, Mohamad Mohty, Ryotaro Nakamura, Katy Rezvani, Brahm H Segal, Bronwen E Shaw, Elizabeth J Shpall, Anthony D Sung, Daniela Weber, Jennifer Whangbo, John R Wingard, William A Wood, Miguel-Angel Perales, Robert R Jenq, Ami S Bhatt
No abstract text is available yet for this article.
February 19, 2018: Biology of Blood and Marrow Transplantation
https://www.readbyqxmd.com/read/29439457/immune-landscape-of-breast-cancers
#10
REVIEW
Divya Nagarajan, Stephanie E B McArdle
Breast cancer is a very heterogeneous disease, both at a molecular and a histological level. Five intrinsic subtypes were initially identified-Luminal-A, Luminal-B, HER2⁺, Triple negative/basal like (TNBC) and normal like-subsequently expanded to seven (Basal-like-1 and 2, mesenchymal, mesenchymal stem-like, luminal androgen receptor, immuno-modulatory and unstable). Although genetic and epigenetic changes are key pathogenic events, the immune system plays a substantial role in promoting progression and metastasis...
February 11, 2018: Biomedicines
https://www.readbyqxmd.com/read/29429519/a-method-for-the-long-term-cultivation-of-mammalian-cells-in-the-absence-of-oxygen-characterization-of-cell-replication-hypoxia-inducible-factor-expression-and-reactive-oxygen-species-production
#11
Balbina J Plotkin, James W Davis, Luigi Strizzi, Peter Lee, Jayme Christoffersen-Cebi, Joan Kacmar, Orlando J Rivero, Norhan Elsayed, Nicholas Zanghi, Brent Ito, Ira M Sigar
The center of tumors, stem cell niches and mucosal surfaces all represent areas of the body that are reported to be anoxic. However, long-term study of anoxic cell physiology is hindered by the lack of a sustainable method permitting cell cultivation in the complete absence of oxygen. A novel methodology was developed that enabled anoxic cell cultivation (17d maximum time tested) and cell passage. In the absence of oxygen, cell morphology is significantly altered. All cells tested exhibited morphologic changes, i...
February 2018: Tissue & Cell
https://www.readbyqxmd.com/read/29428334/biotechnology-challenges-to-in-vitro-maturation-of-hepatic-stem-cells
#12
REVIEW
Chen Chen, Alejandro Soto-Gutierrez, Pedro M Baptista, Bart Spee
The incidence of liver disease is increasing globally. The only curative therapy for severe end-stage liver disease, liver transplantation, is limited by the shortage of organ donors. In vitro models of liver physiology have been developed and new technologies and approaches are progressing rapidly. Stem cells might be used as a source of liver tissue for development of models, therapies, and tissue-engineering applications. However, we have been unable to generate and maintain stable and mature adult liver cells ex vivo...
April 2018: Gastroenterology
https://www.readbyqxmd.com/read/29378627/integrated-multi-omic-analysis-of-host-microbiota-interactions-in-acute-oak-decline
#13
Martin Broberg, James Doonan, Filip Mundt, Sandra Denman, James E McDonald
BACKGROUND: Britain's native oak species are currently under threat from acute oak decline (AOD), a decline-disease where stem bleeds overlying necrotic lesions in the inner bark and larval galleries of the bark-boring beetle, Agrilus biguttatus, represent the primary symptoms. It is known that complex interactions between the plant host and its microbiome, i.e. the holobiont, significantly influence the health status of the plant. In AOD, necrotic lesions are caused by a microbiome shift to a pathobiome consisting predominantly of Brenneria goodwinii, Gibbsiella quercinecans, Rahnella victoriana and potentially other bacteria...
January 30, 2018: Microbiome
https://www.readbyqxmd.com/read/29374371/rethinking-antimicrobial-prophylaxis-in-the-transplant-patient-in-the-world-of-emerging-resistant-organisms-where-are-we-today
#14
REVIEW
Lucy E Horton, Nina M Haste, Randy A Taplitz
PURPOSE OF REVIEW: The use of prophylactic antibiotics during the neutropenic period in hematopoietic stem cell transplantation has been the standard of care at most institutions for the past 20 years. We sought to review the benefits and risks of this practice. RECENT FINDINGS: Emerging data has highlighted the potential costs of antibacterial prophylaxis, from selecting for antibiotic resistance to perturbing the microbiome and contributing to increase risk for Clostridium difficile and perhaps graft-versus-host-disease, conditions which may lead to poorer outcomes...
February 2018: Current Hematologic Malignancy Reports
https://www.readbyqxmd.com/read/29351192/seed-endophyte-microbiome-of-crotalaria-pumila-unpeeled-identification-of-plant-beneficial-methylobacteria
#15
Ariadna S Sánchez-López, Isabel Pintelon, Vincent Stevens, Valeria Imperato, Jean-Pierre Timmermans, Carmen González-Chávez, Rogelio Carrillo-González, Jonathan Van Hamme, Jaco Vangronsveld, Sofie Thijs
Metal contaminated soils are increasing worldwide. Metal-tolerant plants growing on metalliferous soils are fascinating genetic and microbial resources. Seeds can vertically transmit endophytic microorganisms that can assist next generations to cope with environmental stresses, through yet poorly understood mechanisms. The aims of this study were to identify the core seed endophyte microbiome of the pioneer metallophyte Crotalaria pumila throughout three generations, and to better understand the plant colonisation of the seed endophyte Methylobacterium sp...
January 19, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29273643/plasmacytoid-dendritic-cells-protect-from-viral-bronchiolitis-and-asthma-through-semaphorin-4a-mediated-t-reg-expansion
#16
Jason P Lynch, Rhiannon B Werder, Zhixuan Loh, Md Al Amin Sikder, Bodie Curren, Vivian Zhang, Matthew J Rogers, Katie Lane, Jennifer Simpson, Stuart B Mazzone, Kirsten Spann, John Hayball, Kerrilyn Diener, Mark L Everard, Christopher C Blyth, Christian Forstner, Paul G Dennis, Nida Murtaza, Mark Morrison, Páraic Ó Cuív, Ping Zhang, Ashraful Haque, Geoffrey R Hill, Peter D Sly, John W Upham, Simon Phipps
Respiratory syncytial virus-bronchiolitis is a major independent risk factor for subsequent asthma, but the causal mechanisms remain obscure. We identified that transient plasmacytoid dendritic cell (pDC) depletion during primary Pneumovirus infection alone predisposed to severe bronchiolitis in early life and subsequent asthma in later life after reinfection. pDC depletion ablated interferon production and increased viral load; however, the heightened immunopathology and susceptibility to subsequent asthma stemmed from a failure to expand functional neuropilin-1+ regulatory T (T reg) cells in the absence of pDC-derived semaphorin 4a (Sema4a)...
February 5, 2018: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/29226172/enteric-microbiome-markers-as-early-predictors-of-clinical-outcome-in-allogeneic-hematopoietic-stem-cell-transplant-results-of-a-prospective-study-in-adult-patients
#17
Nicasio Mancini, Raffaella Greco, Renée Pasciuta, Maria Chiara Barbanti, Giacomo Pini, Olivia Beatrice Morrow, Mara Morelli, Luca Vago, Nicola Clementi, Fabio Giglio, Maria Teresa Lupo Stanghellini, Alessandra Forcina, Laura Infurnari, Sarah Marktel, Andrea Assanelli, Matteo Carrabba, Massimo Bernardi, Consuelo Corti, Roberto Burioni, Jacopo Peccatori, Maria Pia Sormani, Giuseppe Banfi, Fabio Ciceri, Massimo Clementi
Background: Infections and graft-vs-host disease (GvHD) still represent major, not easily predictable complications in allogeneic hematopoietic stem cell transplant (allo-HSCT). Both conditions have been correlated to altered enteric microbiome profiles during the peritransplant period. The main objective of this study was to identify possible early microbiome-based markers useful in pretransplant risk stratification. Methods: Stool samples were collected from 96 consecutive patients at the beginning of the pretransplant conditioning regimen (T0 ) and at 10 (T1 ) and 30 (T2 ) days following transplant...
2017: Open Forum Infectious Diseases
https://www.readbyqxmd.com/read/29204504/self-renewing-monolayer-of-primary-colonic-or-rectal-epithelial-cells
#18
Yuli Wang, Matthew DiSalvo, Dulan B Gunasekara, Johanna Dutton, Angela Proctor, Michael S Lebhar, Ian A Williamson, Jennifer Speer, Riley L Howard, Nicole M Smiddy, Scott J Bultman, Christopher E Sims, Scott T Magness, Nancy L Allbritton
Background & Aims: Three-dimensional organoid culture has fundamentally changed the in vitro study of intestinal biology enabling novel assays; however, its use is limited because of an inaccessible luminal compartment and challenges to data gathering in a three-dimensional hydrogel matrix. Long-lived, self-renewing 2-dimensional (2-D) tissue cultured from primary colon cells has not been accomplished. Methods: The surface matrix and chemical factors that sustain 2-D mouse colonic and human rectal epithelial cell monolayers with cell repertoires comparable to that in vivo were identified...
July 2017: Cellular and Molecular Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/29203437/effect-of-alcohol-based-hand-rub-on-hand-microbiome-and-hand-skin-health-in-hospitalized-adult-stem-cell-transplant-patients-a-pilot-study
#19
Pranab K Mukherjee, Jyotsna Chandra, Mauricio Retuerto, Karen A Arters, Mary C Consolo, A'ja Patterson, Saralee Bajaksouzian, James W Arbogast, Todd J Cartner, Michael R Jacobs, Mahmoud A Ghannoum, Robert A Salata
No abstract text is available yet for this article.
December 1, 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/29184701/paneth-cells-in-intestinal-physiology-and-pathophysiology
#20
REVIEW
Nikolaus Gassler
Small intestinal mucosa is characterised by villus forming connective tissues with highly specialised surface lining epithelial cells essentially contributing to the establishment of the intestinal border. In order to perform these diverse functions, spatially distinct compartments of epithelial differentiation are found along the crypt-villus axis, including Paneth cells as a highly specialised cell type. Paneth cells locate in crypts and assist undifferentiated columnar cells, called crypt base columnar cells, and rapidly amplifying cells in the regeneration of absorptive and secretory cell types...
November 15, 2017: World Journal of Gastrointestinal Pathophysiology
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