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https://www.readbyqxmd.com/read/28630943/parasites-lacking-the-micronemal-protein-mic2-are-deficient-in-surface-attachment-and-host-cell-egress-but-remain-virulent-in-vivo
#1
Simon Gras, Allison Jackson, Stuart Woods, Gurman Pall, Jamie Whitelaw, Jacqueline M Leung, Gary E Ward, Craig W Roberts, Markus Meissner
Background: Micronemal proteins of the thrombospondin-related anonymous protein (TRAP) family are believed to play essential roles during gliding motility and host cell invasion by apicomplexan parasites, and currently represent major vaccine candidates against Plasmodium falciparum, the causative agent of malaria. However, recent evidence suggests that they play multiple and different roles than previously assumed. Here, we analyse a null mutant for MIC2, the TRAP homolog in Toxoplasma gondii. Methods: We performed a careful analysis of parasite motility in a 3D-environment, attachment under shear stress conditions, host cell invasion and in vivo virulence...
2017: Wellcome Open Research
https://www.readbyqxmd.com/read/28630061/increased-resistance-to-intradermal-francisella-tularensis-lvs-infection-by-inactivation-of-the-sts-phosphatases
#2
Kaustubh Parashar, Erik Kopping, David Frank, Vinaya Sampath, David G Thanassi, Nick Carpino
The Suppressor of TCR signaling proteins (Sts-1 and Sts-2) are two homologous phosphatases that negatively regulate signaling pathways in a number of hematopoietic lineages, including T lymphocytes. Mice lacking Sts expression are characterized by enhanced T cell responses. Additionally, a recent study demonstrated that Sts-/- mice are profoundly resistant to systemic infection of Candida albicans, with resistance characterized by enhanced survival, more rapid fungal clearance in key peripheral organs, and an altered inflammatory response...
June 19, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28624783/malignant-pericytes-expressing-gt198-give-rise-to-tumor-cells-through-angiogenesis
#3
Liyong Zhang, Yan Wang, Mohammad H Rashid, Min Liu, Kartik Angara, Nahid F Mivechi, Nita J Maihle, Ali S Arbab, Lan Ko
Angiogenesis promotes tumor development. Understanding the crucial factors regulating tumor angiogenesis may reveal new therapeutic targets. Human GT198 (PSMC3IP or Hop2) is an oncoprotein encoded by a DNA repair gene that is overexpressed in tumor stromal vasculature to stimulate the expression of angiogenic factors. Here we show that pericytes expressing GT198 give rise to tumor cells through angiogenesis. GT198+ pericytes and perivascular cells are commonly present in the stromal compartment of various human solid tumors and rodent xenograft tumor models...
May 25, 2017: Oncotarget
https://www.readbyqxmd.com/read/28621647/timeliness-and-completeness-of-routine-childhood-vaccinations-in-children-by-two-years-of-age-in-alberta-canada
#4
Vineet Saini, Shannon E MacDonald, Deborah A McNeil, Sheila W McDonald, James D Kellner, Sarah A Edwards, Victoria Stagg, Suzanne Tough
OBJECTIVES: Assessing timeliness and completeness of vaccine administration is important for evaluating the effectiveness of immunization programs. Few studies have reported timeliness, particularly in Canada. The objective of this study was to examine timeliness of the receipt of vaccination for each routine childhood recommended vaccine by 24 months of age among children in a community-based pregnancy cohort in Calgary, Alberta. METHODS: Survey data from a community-based pregnancy cohort in Alberta were linked to Public Health vaccination records of children (n = 2763)...
June 16, 2017: Canadian Journal of Public Health. Revue Canadienne de Santé Publique
https://www.readbyqxmd.com/read/28620164/biodistribution-and-residence-time-of-adenovector-serotype-5-in-normal-and-immunodeficient-mice-and-rats-detected-with-bioluminescent-imaging
#5
Qiang Liu, Shuya Zhou, Changfa Fan, Weijin Huang, Qianqian Li, Susu Liu, Xi Wu, Baowen Li, Youchun Wang
As concerns increase about adenovirus type 5 (Ad5) being a safe gene transfer vector, it is important to evaluate its distribution, residence time, and possible toxicity in immunodeficient populations. To characterize the potential risk associated with different Ad5 vector delivery modes, we used immunocompetent and immunodeficient Rag2 (-/-) animals to establish mouse and rat models that could be monitored with bioluminescent imaging following intramuscular or intravascular infection with an engineered replication-incompetent Ad5 virus carrying the firefly luciferase gene (Ad5-Fluc)...
June 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28618109/vaccination-timeliness-in-preterm-infants-an-integrative-review-of-the-literature
#6
REVIEW
Helen Sisson, Eric Gardiner, Roger Watson
AIMS AND OBJECTIVES: To take a systematic approach to reviewing the scientific literature examining the timeliness of vaccination in preterm infants and to identify any factors associated with timeliness. BACKGROUND: Preterm infants are vulnerable to infection and guidance advocates they are vaccinated in accordance with their full term peers. Vaccination is well tolerated and protective immune responses are observed, yet some early enquiries suggest that preterm infants experience unwarranted delays...
June 15, 2017: Journal of Clinical Nursing
https://www.readbyqxmd.com/read/28615225/enhanced-therapeutic-efficacy-and-memory-of-tumor-specific-cd8-t-cells-by-ex-vivo-pi3k-%C3%AE-inhibition
#7
Rasha Abu-Eid, Shamim Ahmad, Yuan Lin, Mason Webb, Zuzana Berrong, Rajeev K Shrimali, Takumi Kumai, Sudha Ananth, Paulo C Rodriguez, Esteban Celis, John E Janik, Mikayel Mkrtichyan, Samir N Khleif
Inhibition of specific Akt isoforms in CD8+ T cells promotes favored differentiation into memory versus effector cells, the former of which are superior in mediating anti-tumor immunity. In this study, we investigated the role of upstream PI3K isoforms in CD8+ T cell differentiation and assessed the potential use of PI3K isoform-specific inhibitors to favorably condition CD8+ T cells for adoptive cell therapy. The phenotype and proliferative ability of tumor antigen specific CD8+ T cells was assessed in the presence of PI3K-α, -β, or -δ inhibitors...
June 14, 2017: Cancer Research
https://www.readbyqxmd.com/read/28615205/intrasubtype-b-hiv-1-superinfection-correlates-with-delayed-neutralizing-antibody-response
#8
Gabriel A Wagner, Elise Landais, Gemma Caballero, Pham Phung, Sergei L Kosakovsky Pond, Pascal Poignard, Douglas D Richman, Susan J Little, Davey M Smith
Understanding whether the neutralizing antibody (NAb) response impacts HIV-1 superinfection and how superinfection subsequently modulates the NAb response can help clarify correlates of protection from HIV exposures, and better delineate pathways of NAb development. We examined associations between the development of NAb and the occurrence of superinfection in a well-characterized, antiretroviral therapy (ART) naive, primary infection cohort of men who have sex with men. Deep sequencing was applied to blood plasma samples from the cohort to detect cases of superinfection...
June 14, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28612942/cytomegalovirus-vector-expressing-rae-1%C3%AE-induces-enhanced-anti-tumor-capacity-of-murine-cd8-t-cells
#9
Tihana Tršan, Kristina Vuković, Petra Filipović, Ana Lesac Brizić, Niels A W Lemmermann, Kilian Schober, Dirk H Busch, William J Britt, Martin Messerle, Astrid Krmpotić, Stipan Jonjić
Designing CD8(+) T-cell vaccines, which would provide protection against tumors is still considered a great challenge in immunotherapy. Here we show the robust potential of cytomegalovirus (CMV) vector expressing the NKG2D ligand RAE-1γ as CD8(+) T cell-based vaccine against malignant tumors. Immunization with the CMV vector expressing RAE-1γ, delayed tumor growth or even provided complete protection against tumor challenge in both prophylactic and therapeutic settings. Moreover, a potent tumor control in mice vaccinated with this vector can be further enhanced by blocking the immune checkpoints TIGIT and PD-1...
June 14, 2017: European Journal of Immunology
https://www.readbyqxmd.com/read/28607114/varicella-zoster-virus-specific-cellular-immune-responses-to-the-live-attenuated-zoster-vaccine-in-young-and-older-adults
#10
Adriana Weinberg, Jennifer Canniff, Nadine Rouphael, Aneesh Mehta, Mark Mulligan, Jennifer A Whitaker, Myron J Levin
The incidence and severity of herpes zoster (HZ) increases with age. The live attenuated zoster vaccine generates immune responses similar to HZ. We compared the immune responses to zoster vaccine in young and older to adults to increase our understanding of the immune characteristics that may contribute to the increased susceptibility to HZ in older adults. Young (25-40 y; n = 25) and older (60-80 y; n = 33) adults had similar magnitude memory responses to varicella-zoster virus (VZV) ex vivo restimulation measured by responder cell-frequency and flow cytometry, but the responses were delayed in older compared with young adults...
June 12, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28602742/effect-of-crowding-stress-on-the-immune-response-in-turbot-scophthalmus-maximus-vaccinated-with-attenuated-edwardsiella-tarda
#11
Huanhuan Huo, Shuting Yin, Rui Jia, Bin Huang, Jilin Lei, Baoliang Liu
The aim of this study was to evaluate the immune responses in turbot, Scophthalmus maximus, treated with 1 × 10(7) cfu/ml attenuated Edwardsiella tarda (0.1 ml/fish) under low density (LD; ∼5.25-5.13 kg/m(2), initial to final density), medium density (MD; ∼10.41-13.95 kg/m(2)), and high density (HD; ∼20.53-30.77 kg/m(2)) conditions for 8 weeks. The results showed that there was a peak value in the percentage of sIg+ (surface immunoglobulin-positive) cells in blood leucocytes (BL), spleen leucocytes (SL), and pronephros leucocytes (PL) during the sixth week in the HD, which was delayed by week compared with the other groups...
June 7, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28599274/trans-sialidase-based-vaccine-candidate-protects-against-trypanosoma-cruzi-infection-not-only-inducing-an-effector-immune-response-but-also-affecting-cells-with-regulatory-suppressor-phenotype
#12
Estefanía Prochetto, Carolina Roldán, Iván A Bontempi, Daiana Bertona, Luz Peverengo, Miguel H Vicco, Luz M Rodeles, Ana R Pérez, Iván S Marcipar, Gabriel Cabrera
Prophylactic and/or therapeutic vaccines have an important potential to control Trypanosoma cruzi (T. cruzi)infection. The involvement of regulatory/suppressor immune cells after an immunization treatment and T. cruzi infection has never been addressed. Here we show that a new trans-sialidase-based immunogen (TSf) was able to confer protection, correlating not only with beneficial changes in effector immune parameters, but also influencing populations of cells related to immune control.Regarding the effector response, mice immunized with TSf showed a TS-specific antibody response, significant delayed-type hypersensitivity (DTH) reactivity and increased production of IFN-γ by CD8+ splenocytes...
May 25, 2017: Oncotarget
https://www.readbyqxmd.com/read/28596550/booster-immunizations-with-dna-plasmids-encoding-her-2-neu-prevent-spontaneous-mammary-cancer-in-her-2-neu-transgenic-mice-over-life-span
#13
Mauro Provinciali, Alessandra Barucca, Fiorenza Orlando, Elisa Pierpaoli
Cancer vaccines are less effective at old than at young age because of immunosenescence. Besides, in preliminary observations we showed that the immunization with HER-2/neu DNA plasmid in transgenic young mice (standard immunization, SI) delays but not abrogate spontaneous mammary tumours progressively appearing during aging. In this study we evaluated whether booster immunizations (BI) of HER-2/neu transgenic mice with HER-2/neu DNA plasmids every 6 (ECD6), 3 (ECD3), or 1.5 (ECD1.5) months after SI induce a protective immunity that could be maintained over life span...
June 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28592985/child-feeding-practices-and-diarrheal-disease-among-children-less-than-two-years-of-age-of-the-nomadic-people-in-hadaleala-district-afar-region-northeast-ethiopia
#14
Zemichael Gizaw, Wondwoson Woldu, Bikes Destaw Bitew
BACKGROUND: Diarrhea is a serious public health problem in Ethiopia. It is responsible for 24-30% of all infant deaths and there is a lack of evidence on the health burdens among the nomadic people. This study was therefore designed to assess the prevalence of diarrhea among children less thanvtwo year's of age and its association with feeding practices among the nomadic people in Hadaleala district, northeast Ethiopia. METHODS: A cross-sectional study was conducted in Hadaleala district...
2017: International Breastfeeding Journal
https://www.readbyqxmd.com/read/28588131/rationally-designed-influenza-virus-vaccines-that-are-antigenically-stable-during-growth-in-eggs
#15
Alfred T Harding, Brook E Heaton, Rebekah E Dumm, Nicholas S Heaton
Influenza virus vaccine production is currently limited by the ability to grow circulating human strains in chicken eggs or in cell culture. To facilitate cost-effective growth, vaccine strains are serially passaged under production conditions, which frequently results in mutations of the major antigenic protein, the viral hemagglutinin (HA). Human vaccination with an antigenically drifted strain is known to contribute to poor vaccine efficacy. To address this problem, we developed a replication-competent influenza A virus (IAV) with an artificial genomic organization that allowed the incorporation of two independent and functional HA proteins with different growth requirements onto the same virion...
June 6, 2017: MBio
https://www.readbyqxmd.com/read/28586623/longitudinal-trends-in-vaccine-hesitancy-in-a-cohort-of-mothers-surveyed-in-washington-state-2013-2015
#16
Nora B Henrikson, Melissa L Anderson, Douglas J Opel, John Dunn, Edgar K Marcuse, David C Grossman
Parents who refuse or delay vaccines because of vaccine hesitancy place children at increased risk for vaccine-preventable disease. How parental vaccine hesitancy changes as their children age is not known. In 2015, we conducted a follow-up survey of 237 mothers enrolled in a 2-arm clinic-level cluster randomized trial (n = 488) in Washington State that was completed in 2013. We surveyed mothers at their baby's birth, age 6 months, and age 24 months using a validated measure of vaccine hesitancy. Both mean hesitancy scores (mean 4...
January 1, 2017: Public Health Reports
https://www.readbyqxmd.com/read/28586013/immunogenicity-and-immunoreactivity-of-tp0821-recombinant-protein-from-treponema%C3%A2-pallidum
#17
Ning Wu, Ni Li, Liping Hu, Jun He, Junhong Li, Feijun Zhao, Yimou Wu
Treponema pallidum (Tp) is responsible for invading reproductive organs and the skin in early stages, and involves almost all organs/systems at advanced stages. In the present study, screening of the dominant epitope fragment of the Tp outer membrane protein, Tp0821, was performed and the prokaryotic expression vector pQE32/Tp0821 was constructed. The denaturation and dialysis of rTp0821 were achieved through ultrasound, inclusion body washing and dissolution. Experiments in purified rTp0821‑immune New Zealand rabbits indicated that the recombinant proteins were of high immunogenicity, and the irritation led a marked humoral immune response in the New Zealand rabbits...
July 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28584174/poor-livestock-keepers-ecosystem-poverty-health-interactions
#18
REVIEW
Delia Grace, Johanna Lindahl, Francis Wanyoike, Bernard Bett, Tom Randolph, Karl M Rich
Humans have never been healthier, wealthier or more numerous. Yet, present success may be at the cost of future prosperity and in some places, especially in sub-Saharan Africa, poverty persists. Livestock keepers, especially pastoralists, are over-represented among the poor. Poverty has been mainly attributed to a lack of access, whether to goods, education or enabling institutions. More recent insights suggest ecosystems may influence poverty and the self-reinforcing mechanisms that constitute poverty traps in more subtle ways...
July 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28582374/management-of-corneal-scarring-secondary-to-herpes-zoster-keratitis
#19
Omar M Hassan, Asim V Farooq, Ketki Soin, Ali R Djalilian, Joshua H Hou
PURPOSE: To review the management of visually significant corneal scarring secondary to herpes zoster keratitis (HZK). METHODS: Literature review. RESULTS: Management options for visually significant corneal scarring secondary to HZK include scleral contact lenses, photorefractive or phototherapeutic keratectomy, lamellar keratoplasty, penetrating keratoplasty, and keratoprosthesis. Many authors recommend tarsorrhaphy in at-risk patients at the time of corneal transplantation...
June 2, 2017: Cornea
https://www.readbyqxmd.com/read/28578210/public-attitudes-toward-child-undervaccination-a-randomized-experiment-on-evaluations-stigmatizing-orientations-and-support-for-policies
#20
Richard M Carpiano, Nicholas S Fitz
Child undervaccination is a complex public health problem and a contentious social and political issue. Efforts to increase vaccination coverage require understanding how the public evaluates different reasons for child undervaccination, which may influence attitudes, stigmatizing behaviors, and support for vaccination policies. We conducted a vignette experiment with a United States national online sample (n = 1469) to investigate how and why different undervaccination actions shape evaluations (blame, anger, sympathy, differentness, credibility, dangerousness), stigmatizing orientations (social distance, discrimination), and support for particular policies (e...
May 6, 2017: Social Science & Medicine
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