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neonatal immune system

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https://www.readbyqxmd.com/read/29348261/complement-receptor-c5ar1-plays-an-evolutionarily-conserved-role-in-successful-cardiac-regeneration
#1
Niranjana Natarajan, Yamen Abbas, Donald M Bryant, Juan Manuel Gonzalez-Rosa, Michka Sharpe, Aysu Uygur, Lucas H Cocco-Delgado, Nhi Ngoc Ho, Norma P Gerard, Craig J Gerard, Calum A Macrae, Caroline E Burns, C Geoffrey Burns, Jessica L Whited, Richard T Lee
Background -Defining conserved molecular pathways in animal models of successful cardiac regeneration could yield insight into why adult mammals have inadequate cardiac regeneration after injury. Insight into the transcriptomic landscape of early cardiac regeneration from model organisms will shed light on evolutionarily conserved pathways in successful cardiac regeneration. Methods -Here we describe a cross-species transcriptomic screen in three model organisms for cardiac regeneration -axolotl, neonatal mice and zebrafish...
January 18, 2018: Circulation
https://www.readbyqxmd.com/read/29311619/in-situ-immune-response-and-mechanisms-of-cell-damage-in-central-nervous-system-of-fatal-cases-microcephaly-by-zika-virus
#2
Raimunda S S Azevedo, Jorge R de Sousa, Marialva T F Araujo, Arnaldo J Martins Filho, Bianca N de Alcantara, Fernanda M C Araujo, Maria G L Queiroz, Ana C R Cruz, Beatriz H Baldez Vasconcelos, Jannifer O Chiang, Lívia C Martins, Livia M N Casseb, Eliana V da Silva, Valéria L Carvalho, Barbara C Baldez Vasconcelos, Sueli G Rodrigues, Consuelo S Oliveira, Juarez A S Quaresma, Pedro F C Vasconcelos
Zika virus (ZIKV) has recently caused a pandemic disease, and many cases of ZIKV infection in pregnant women resulted in abortion, stillbirth, deaths and congenital defects including microcephaly, which now has been proposed as ZIKV congenital syndrome. This study aimed to investigate the in situ immune response profile and mechanisms of neuronal cell damage in fatal Zika microcephaly cases. Brain tissue samples were collected from 15 cases, including 10 microcephalic ZIKV-positive neonates with fatal outcome and five neonatal control flavivirus-negative neonates that died due to other causes, but with preserved central nervous system (CNS) architecture...
January 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29298985/selenium-implications-for-outcomes-in-extremely-preterm-infants
#3
REVIEW
Rachael Tindell, Trent Tipple
Extremely preterm infants are at high risk for morbidities including bronchopulmonary dysplasia, intraventricular hemorrhage, and retinopathy of prematurity likely related to their exposure to reactive oxygen and nitrogen species early in life. Selenium is a trace mineral contributes to the proper function of multiple systems including immunity, redox regulation, and inflammation via the "selenoenzymes" glutathione peroxidase, thioredoxin reductase, and selenoprotein P. Given that selenium accretion via the placenta occurs primarily during the third trimester, preterm neonates are born selenium deficient...
January 3, 2018: Journal of Perinatology: Official Journal of the California Perinatal Association
https://www.readbyqxmd.com/read/29287940/many-layers-of-embryonic-hematopoiesis-new-insights-into-b-cell-ontogeny-and-the-origin-of-hematopoietic-stem-cells
#4
Brandon Hadland, Momoko Yoshimoto
In adult hematopoiesis, the hematopoietic stem cell (HSC) sits at the top of a hierarchy of hematopoietic progenitors responsible for generating the diverse repertoire of blood and immune cells. During embryonic development, however, the initial waves of hematopoiesis provide the first functioning blood cells of the developing embryo, such as primitive erythrocytes arising in the yolk sac, independently of HSC. In the field of developmental immunology, it has been recognized that some components of the immune system, such as B-1a lymphocytes, are uniquely produced during the embryonic and neonatal period, suggesting a "layered" development of immunity...
December 26, 2017: Experimental Hematology
https://www.readbyqxmd.com/read/29285663/correlation-between-the-concentrations-of-lactoferrin-and-neutrophil-gelatinase-associated-lipocalin-in-meconium
#5
Barbara Lisowska-Myjak, Ewa Skarżyńska, Paulina Wilczyńska, Artur Jakimiuk
Neutrophil gelatinase-associated lipocalin (NGAL) and lactoferrin (Lf) are among the key components of the innate immune system due to their ability to bind iron with high affinity and thus control inflammation. The aim of this study was to test the use of NGAL and LF measurements in meconium for the assessment of the intrauterine homeostasis. NGAL and Lf concentrations were measured using ELISA kits in all serial meconium portions (n = 81) collected from 20 healthy neonates. Mean ± SD meconium concentration of Lf was 45...
December 29, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/29275405/neonatal-systemic-inflammation-induces-inflammatory-reactions-and-brain-apoptosis-in-a-pathogen-specific-manner
#6
Mari Falck, Damjan Osredkar, Thomas Ragnar Wood, Elke Maes, Torun Flatebø, Hemmen Sabir, Marianne Thoresen
BACKGROUND: After neonatal asphyxia, therapeutic hypothermia (HT) is the only proven treatment option. Although established as a neuroprotective therapy, benefit from HT has been questioned when infection is a comorbidity to hypoxic-ischaemic (HI) brain injury. Gram-negative and gram-positive species activate the immune system through different pathogen recognition receptors and subsequent immunological systems. In rodent models, gram-negative (lipopolysaccharide [LPS]) and gram-positive (PAM3CSK4 [PAM]) inflammation similarly increase neuronal vulnerability to HI...
December 23, 2017: Neonatology
https://www.readbyqxmd.com/read/29261653/key-scientific-issues-in-developing-drinking-water-guidelines-for-perfluoroalkyl-acids-contaminants-of-emerging-concern
#7
Gloria B Post, Jessie A Gleason, Keith R Cooper
Perfluoroalkyl acids (PFAAs), a group of synthetic organic chemicals with industrial and commercial uses, are of current concern because of increasing awareness of their presence in drinking water and their potential to cause adverse health effects. PFAAs are distinctive among persistent, bioaccumulative, and toxic (PBT) contaminants because they are water soluble and do not break down in the environment. This commentary discusses scientific and risk assessment issues that impact the development of drinking water guidelines for PFAAs, including choice of toxicological endpoints, uncertainty factors, and exposure assumptions used as their basis...
December 2017: PLoS Biology
https://www.readbyqxmd.com/read/29251369/association-of-polymorphism-in-the-vegfa-gene-3-utr-936t-c-with-susceptibility-to-biliary-atresia-in-a-southern-chinese-han-population
#8
Fei Liu, Jixiao Zeng, Deli Zhu, Ruizhong Zhang, Xiaogang Xu, Mengmeng Wang, Yan Zhang, Huimin Xia, Zhichun Feng
BACKGROUND: Biliary atresia (BA) is a neonatal disease characterized by chronic inflammation of the bile ducts and progressive aggravation of jaundice, but with a poor prognosis and high mortality. The etiology of BA is still uncertain which may be related to gene defect, virus infection, immune disorder, gene polymorphism. As a proinflammatory cytokine, VEGFA gene polymorphism (rs3025039) has been shown to be related to the pathogenesis of BA in Taiwanese population. METHODS: We investigated the association between VEGFA gene polymorphism (rs3025039) and BA susceptibility using the largest case-control cohort, totaling with 506 BA patients and 1473 healthy controls in a Southern Chinese Han population...
December 18, 2017: Journal of Clinical Laboratory Analysis
https://www.readbyqxmd.com/read/29250748/age-is-the-work-of-art-impact-of-neutrophil-and-organism-age-on-neutrophil-extracellular-trap-formation
#9
REVIEW
Weronika Ortmann, Elzbieta Kolaczkowska
Neutrophil extracellular traps or NETs are released by highly activated neutrophils in response to infectious agents, sterile inflammation, autoimmune stimuli and cancer. In the cells, the nuclear envelop disintegrates and decondensation of chromatin occurs that depends on peptidylarginine deiminase 4 (PAD4) and neutrophil elastase (NE). Subsequently, proteins from neutrophil granules (e.g., NE, lactoferrin and myeloperoxidase) and the nucleus (histones) bind to decondensed DNA and the whole structure is ejected from the cell...
December 18, 2017: Cell and Tissue Research
https://www.readbyqxmd.com/read/29250560/pulmonary-susceptibility-of-neonates-to-respiratory-syncytial-virus-infection-a-problem-of-innate-immunity
#10
REVIEW
Carole Drajac, Daphné Laubreton, Sabine Riffault, Delphyne Descamps
Human respiratory syncytial virus (RSV) is a common and highly contagious viral agent responsible for acute lower respiratory infection in infants. This pathology characterized by mucus hypersecretion and a disturbed T cell immune response is one of the major causes of infant hospitalization for severe bronchiolitis. Although different risk factors are associated with acute RSV bronchiolitis, the immunological factors contributing to the susceptibility of RSV infection in infants are not clearly elucidated...
2017: Journal of Immunology Research
https://www.readbyqxmd.com/read/29238342/breastfeeding-behaviors-and-the-innate-immune-system-of-human-milk-working-together-to-protect-infants-against-inflammation-hiv-1-and-other-infections
#11
REVIEW
Bethany M Henrick, Xiao-Dan Yao, Laila Nasser, Ava Roozrogousheh, Kenneth L Rosenthal
The majority of infants' breastfeeding from their HIV-infected mothers do not acquire HIV-1 infection despite exposure to cell-free virus and cell-associated virus in HIV-infected breast milk. Paradoxically, exclusive breastfeeding regardless of the HIV status of the mother has led to a significant decrease in mother-to-child transmission (MTCT) compared with non-exclusive breastfeeding. Although it remains unclear how these HIV-exposed infants remain uninfected despite repeated and prolonged exposure to HIV-1, the low rate of transmission is suggestive of a multitude of protective, short-lived bioactive innate immune factors in breast milk...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29234319/they-are-what-you-eat-can-nutritional-factors-during-gestation-and-early-infancy-modulate-the-neonatal-immune-response
#12
REVIEW
Sarah Prentice
The ontogeny of the human immune system is sensitive to nutrition even in the very early embryo, with both deficiency and excess of macro- and micronutrients being potentially detrimental. Neonates are particularly vulnerable to infectious disease due to the immaturity of the immune system and modulation of nutritional immunity may play a role in this sensitivity. This review examines whether nutrition around the time of conception, throughout pregnancy, and in early neonatal life may impact on the developing infant immune system...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29225605/the-state-of-cellular-adoptive-immunotherapy-for-neuroblastoma-and-other-pediatric-solid-tumors
#13
Thanh-Phuong Le, To-Ha Thai
Research on adult cancer immunotherapy is proceeding at a rapid pace resulting in an impressive success rate exemplified by a few high profile cases. However, this momentum is not readily extended to pediatric immunotherapy, and it is not for lack of trying. Though reasons for the slower advance are not apparent, some issues can be raised. Pediatric cancer patients represent a distinct demographic group whose immune system is inherently different from that of mature adults. Treating pediatric patients with immunotherapy designed for adults may not yield objective clinical responses...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29211052/maternal-vaccination-immunization-of-sows-during-pregnancy-against-etec-infections
#14
REVIEW
Jose Matías, Melibea Berzosa, Yadira Pastor, Juan M Irache, Carlos Gamazo
The immunology of pregnancy is an evolving consequence of multiple reciprocal interactions between the maternal and the fetal-placental systems. The immune response must warrant the pregnancy outcome (including tolerance to paternal antigens), but at the same time, efficiently respond to pathogenic challenges. Enterotoxigenic Escherichia coli (ETEC) strains are a major cause of illness and death in neonatal and recently weaned pigs. This review aims to give an overview of the current rationale on the maternal vaccination strategies for the protection of the newborn pig against ETEC...
December 6, 2017: Vaccines
https://www.readbyqxmd.com/read/29204910/who-is-the-patient-at-risk-of-cmv-recurrence-a-review-of-the-current-scientific-evidence-with-a-focus-on-hematopoietic-cell-transplantation
#15
REVIEW
Jan Styczynski
Cytomegalovirus (CMV) is an agent of global infection, and its acquisition in a population is characterized by an age-dependent rise in seropositivity. After primary infection, CMV remains in the host cells in latent form, and it can reactivate in the case of immune suppression. The risk of CMV recurrence is dependent on the level of incompetency of the immune system, manifested as an impairment of T-cell immunity, including the presence and function of CMV-specific cytotoxic T lymphocytes. This article presents data on the incidence of CMV recurrence in groups of immunocompromised patients, including allogeneic hematopoietic stem cell transplantation (HSCT) patients and other groups of patients, based on a summary of reported data...
December 4, 2017: Infectious Diseases and Therapy
https://www.readbyqxmd.com/read/29204384/approach-to-a-child-with-primary-immunodeficiency-made-simple
#16
REVIEW
Dhrubajyoti Sharma, Ankur K Jindal, Amit Rawat, Surjit Singh
Primary immunodeficiency disorders (PIDs) are a group of disorders affecting the capability to fight against infection. These include defects in T cells and B cells affecting cell-mediated and humoral immunity, respectively, combined humoral and cell-mediated immunodeficiency, defects in phagocytosis, complement defects, and defects in cytokine or cytokine signalling pathways which are detrimental for immune function. Depending upon the type and severity, age at onset of symptoms can vary from neonatal period to late childhood...
November 2017: Indian Dermatology Online Journal
https://www.readbyqxmd.com/read/29203321/lipopolysaccharide-impairs-mucin-secretion-and-stimulated-mucosal-immune-stress-response-in-respiratory-tract-of-neonatal-chicks
#17
Xiaoxiao Fan, Hongchao Jiao, Jingpeng Zhao, Xiaojuan Wang, Hai Lin
The chicken immune system is immature at the time of hatching. The development of the respiratory immune system after hatching is vital to young chicks. The aim of this study was to investigate the effect of LPS on respiratory mucin and IgA production in chicks. In this study, we selected 7days old AA broilers of similar weigh randomly; LPS atomized at 1mg/kg body weigh dose in the confined space of 1 cubic meter. The chickens exposed for 2h. Then collect samples after 4h and 8h respectively. Compared to control, LPS inhibited mucus production in BALF, caused a rising trend of the concentration of IgA in serum and BALF, and increased the protein expression of IgA in lung tissue...
December 1, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/29197124/breast-milk-cells-trafficking-induces-microchimerism-mediated-immune-system-maturation-in-the-infant
#18
REVIEW
Jean-Pierre Molès, Edouard Tuaillon, Chipepo Kankasa, Anne-Sophie Bedin, Nicolas Nagot, Arnaud Marchant, Joann M McDermid, Philippe Van de Perre
Initiating breastfeeding within the first hour of life confers an important benefit in terms of child mortality and severe morbidity. Intestinal permeability to ingested macromolecules and immunoglobulins is limited to the first days of human life. These exchanges cease in the very early post-partum period but may increase beyond the neonatal period in response to local inflammation or introduction of a weaning food. From animal- and limited human-based observations, compelling evidence points out to breast milk cells also trafficking from mother to infant mucosal tissues and participating to the maternal microchimerism...
December 2, 2017: Pediatric Allergy and Immunology
https://www.readbyqxmd.com/read/29195019/is-immunosuppression-induced-by-neonatal-thymectomy-compatible-with-poor-reproductive-performance-in-adult-male-rats
#19
M M Ommati, N Tanideh, B Rezakhaniha, J Wang, S Sabouri, M Vahedi, B Dormanesh, O Koohi Hosseinabadi, F Rahmanifar, S Moosapour, A Akhlaghi, R Heidari, M J Zamiri
With increasing knowledge that the immune system has a major impact on reproductive ‎health, the potential for cells arising in organs such as the thymus to alleviate oxidative stress ‎has been revealed. This study addresses the impact of neonatal thymectomy on male ‎reproductive function in pubertal and adult animals. Neonatal Sprague Dawley rats were allotted to four treatments consisting of fully thymectomized, partially thymectomized, intact, and sham-operated rats. Half of the rats in each treatment were sacrificed at 40 and the other half at 80 days of age...
January 2018: Andrology
https://www.readbyqxmd.com/read/29194835/oxidative-stress-diseases-unique-to-the-perinatal-period-a-window-into-the-developing-innate-immune-response
#20
Robert M Dietz, Clyde J Wright
The innate immune system has evolved to play an integral role in the normally developing lung and brain. However, in response to oxidative stress, innate immunity, mediated by specific cellular and molecular programs and signaling, contributes to pathology in these same organ systems. Despite opposing drivers of oxidative stress, namely hyperoxia in neonatal lung injury and hypoxia/ischemia in neonatal brain injury, similar pathways-including toll-like receptors, NFκB and MAPK cascades-have been implicated in tissue damage...
November 30, 2017: American Journal of Reproductive Immunology: AJRI
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