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secretory immunoglobulin a

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https://www.readbyqxmd.com/read/29321331/germline-igm-is-sufficient-but-not-required-for-antibody-mediated-alphavirus-clearance-from-the-central-nervous-system
#1
Voraphoj Nilaratanakul, Jie Chen, Oanh Tran, Victoria K Baxter, Elizabeth M Troisi, Jane X Yeh, Diane E Griffin
Sindbis virus (SINV) infection of neurons in the brain and spinal cord in mice provides a model system for investigating recovery from encephalomyelitis and antibody-mediated clearance of virus from the central nervous system (CNS). To determine the roles of IgM and IgG in recovery, we compared the responses of immunoglobulin-deficient activation-induced adenosine deaminase (AID)-/-, secretory IgM (sIgM)-/- and AID-/- sIgM-/- double knock out (DKO) mice with wild-type (WT) C57BL/6 mice for disease, clearance of infectious virus and viral RNA from brain and spinal cord, antibody responses and B cell infiltration into the CNS...
January 10, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29314863/bacterial-derived-neutrophilic-inflammation-drives-lung-remodeling-in-a-mouse-model-of-copd
#2
Bradley W Richmond, Rui-Hong Du, Wei Han, John T Benjamin, Riet van der Meer, Linda Gleaves, Marshall Guo, Austin McKissack, Yongqin Zhang, Dong-Sheng Cheng, Vasiliy V Polosukhin, Timothy S Blackwell
Loss of secretory immunoglobulin A (SIgA) is common in the small airways of patients with chronic obstructive pulmonary disease (COPD) and may contribute to disease pathogenesis. Using mice that lack SIgA in the airways due to genetic deficiency of polymeric immunoglobulin receptor (pIgR-/- mice), we investigated the role of neutrophils in driving the fibrotic small airway wall remodeling and emphysema that develops spontaneously in these mice. By flow cytometry, we found an increase in the percentage of neutrophils among CD45+ cells in the lungs, as well as an increase in total neutrophils, in pIgR-/- mice compared to wild-type (WT) controls...
January 9, 2018: American Journal of Respiratory Cell and Molecular Biology
https://www.readbyqxmd.com/read/29251598/ratiometric-sensing-of-bip-client-versus-bip-levels-by-the-unfolded-protein-response-determines-its-signaling-amplitude
#3
Anush Bakunts, Andrea Orsi, Milena Vitale, Angela Cattaneo, Federica Lari, Laura Tadè, Roberto Sitia, Andrea Raimondi, Angela Bachi, Eelco van Anken
Insufficient folding capacity of the endoplasmic reticulum (ER) activates the unfolded protein response (UPR) to restore homeostasis. Yet, how the UPR achieves ER homeostatic readjustment is poorly investigated, since in most studies the ER-stress that is elicited cannot be overcome. Here we show that a proteostatic insult, achieved by persistent expression of the secretory heavy chain of immunoglobulin M (µs), is well-tolerated in HeLa cells. Upon µs expression, its levels temporarily eclipse those of the ER-chaperone BiP, leading to acute, full-geared UPR activation...
December 18, 2017: ELife
https://www.readbyqxmd.com/read/29250793/dietary-synbiotic-incorporation-as-an-alternative-to-antibiotic-improves-growth-performance-intestinal-morphology-immunity-and-antioxidant-capacity-of-broilers
#4
Y P Chen, C Wen, Y M Zhou
BACKGROUD: This study was conducted to investigate effects of dietary synbiotic supplementation as an alternative to antibiotic on growth performance, intestinal morphology, immunity and oxidative status of broilers. 1-day-old male chicks were allocated to 3 treatments, and given a basal diet free from antibiotic (Control group), and the basal diet supplemented with either chlortetracycline or synbiotic for 42 days, respectively. RESULTS: Compared with control group, the supplementation of synbiotic increased average daily gain and gain : feed ratio of broilers from 22 to 42 days and 1 to 42 days of age, and the relative weight of thymus and secretory immunoglobulin A level in the jejunum and ileum at 42 days of age, with the values of these parameters being similar to antibiotic group...
December 18, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29248629/polymeric-immunoglobulin-receptor-in-dojo-loach-misgurnus-anguillicaudatus-molecular-characterization-and-expression-analysis-in-response-to-bacterial-and-parasitic-challenge
#5
Yongyao Yu, Yangzhou Liu, Huili Li, Shuai Dong, Qingchao Wang, Zhenyu Huang, Weiguang Kong, Xiaoting Zhang, Yongshen Xu, Xiaoyao Chen, Zhen Xu
The polymeric immunoglobulin receptor (pIgR) is an essential component of the mucosal immune system in jawed vertebrates including teleost fish, which mediate transepithelial transport of secretory immunoglobulins (sIgs) to protect organisms against environmental pathogens. In this study, we firstly cloned and identified the pIgR from dojo loach (Misgurnus anguillicaudatus). The full-length cDNA of Ma-pIgR was of 1145 bp, containing an open reading frame (ORF) of 1101 bp encoded a predicted protein of 336 amino acids...
December 14, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29248622/partial-enteral-nutrition-increases-intestinal-siga-levels-in-mice-undergoing-parenteral-nutrition-in-a-dose-dependent-manner
#6
Haifeng Sun, Jingcheng Bi, Qiucheng Lei, Xiao Wan, Tingting Jiang, Chao Wu, Xinying Wang
BACKGROUND AND AIMS: Partial enteral nutrition (PEN) protects parenteral nutrition (PN) induced gut mucosal immunity impairment. However, the gastrointestinal function of most patients with PN is too poor to tolerate full dosage of PEN and no guidelines recommend PEN dose. We aimed to identify an optimal PEN dose and to understand the protective mechanism. METHODS: Mice were assigned to groups with total parenteral nutrition (TPN), total enteral nutrition (TEN), or various degrees of PEN with PN...
December 14, 2017: International Journal of Surgery
https://www.readbyqxmd.com/read/29236714/non-invasive-identification-of-protein-biomarkers-for-early-pregnancy-diagnosis-in-the-cheetah-acinonyx-jubatus
#7
Diana C Koester, David E Wildt, Morgan Maly, Pierre Comizzoli, Adrienne E Crosier
Approximately 80% of cheetahs living in typical zoological collections never reproduce. In more than 60% of breedings, the female is confirmed to ovulate, but parturition fails to occur. It is unknown if these non-pregnant intervals of elevated progesterone (deemed luteal phases) are conception failures or a pregnancy terminating in embryonic/fetal loss. There have been recent advances in metabolic profiling and proteome analyses in many species with mass spectrometry used to identify 'biomarkers' and mechanisms indicative of specific physiological states (including pregnancy)...
2017: PloS One
https://www.readbyqxmd.com/read/29231549/-mechanism-of-acupoint-transcutaneous-electric-stimulation-on-analgesic-anesthesia-in-the-patients-undergoing-general-anesthesia-anorectal-operation
#8
Yufang Lin, Wei Yang, Yajuan Li, Yin Li, Qiuyu Tong, Wen Ma, Yijing Li, Weidong Shen
OBJECTIVE: To observe the regulatory effects of acupoint electric stimulation on the analgesic substances and the relevant indices of nerve-immunity-endocrine system in the patients undergoing general anesthesia anorectal operation. METHODS: One hundred and fifty-six patients undergoing hemorrhoids and anal fistula operation were randomized into three groups, 146 cases were included in the analysis. In the No.1 group (48 cases), the conventional intravenous general anesthesia was applied...
July 12, 2017: Zhongguo Zhen Jiu, Chinese Acupuncture & Moxibustion
https://www.readbyqxmd.com/read/29152785/ultrastructure-of-plasma-cells-in-harderian-gland-of-laying-hens
#9
P Bejdić, R Avdić, Lj Amidžić, V Ćutahija, F Tandir, N Hadžiomerović, A Katica, N Mlaćo
Ultrastructure of plasma cells in Harderian gland was investigated using the transmission electron microscopy. For this research, we examined the glands of 32 laying hens collected at 1, 7, 20 and 40 days and 4, 6, 8 and 12 months of the birds' ages. The research showed that the stroma of the gland contains a large number of lymphocytes and plasma cells. Most of the plasma cells are mature, but morphologically do not show productive activity. Only some individual plasma cells, situated under the secretory epithelium of primary and secondary ducts, have extremely dilated cisternae of rough endoplasmic reticulum which contain moderately dense, granular material...
November 19, 2017: Anatomia, Histologia, Embryologia
https://www.readbyqxmd.com/read/29143175/vectors-for-expression-of-signal-peptide-dependent-proteins-in-baculovirus-insect-cell-systems-and-their-application-to-expression-and-purification-of-the-high-affinity-immunoglobulin-gamma-fc-receptor-i-in-complex-with-its-gamma-chain
#10
Le T M Le, Jens R Nyengaard, Monika M Golas, Bjoern Sander
Integral membrane proteins play a central role in various cellular functions and are important therapeutic targets. However, technical challenges in the overexpression and purification of membrane proteins often represent a limiting factor for biochemical and structural studies. Here, we constructed a set of vectors, derivatives of MultiBac vectors that can be used to express proteins with a cleavable N-terminal signal peptide in insect cells. We propose these vectors for expression of type I membrane proteins and other secretory pathway proteins that require the signal recognition particle for translocation to the endoplasmic reticulum (ER)...
November 15, 2017: Molecular Biotechnology
https://www.readbyqxmd.com/read/29123984/transmembrane-thioredoxin-related-protein-tmx1-is-reversibly-oxidized-in-response-to-protein-accumulation-in-the-endoplasmic-reticulum
#11
Yoshiyuki Matsuo, Kiichi Hirota
Numerous secretory and membrane proteins undergo post-translational modifications in the endoplasmic reticulum (ER), and the formation of disulfide bonds is a modification that is critical for proper protein folding. The mammalian ER contains a large family of oxidoreductases that are considered to catalyze thiol/disulfide exchange and ensure the maintenance of a redox environment within the ER. Disruption of ER homeostasis causes an accumulation of misfolded and unfolded proteins, a condition termed ER stress...
November 2017: FEBS Open Bio
https://www.readbyqxmd.com/read/29102516/colocalization-of-intracellular-specific-iga-iciga-with-influenza-virus-in-patients-nasopharyngeal-aspirate-cells
#12
Tuck-Weng Kok, Maurizio Costabile, Gregory A Tannock, Peng Li
Inhibition of viral replication by icIgA antibodies has only been observed with in vitro studies using epithelial cell lines in transwell cultures. This effect appears to involve an interaction between polymeric immunoglobulin A (pIgA) and viral particles within an intracellular compartment, since IgA is transported across polarized cells. Polyclonal guinea pig antisera against purified influenza A virus and mouse antisera prepared against Influenza A/H3N2 hemagglutinin (HA0) cleavage loop peptides, were used in confocal fluorescence microscopy to show specific staining of wild-type influenza H1N1 and H3N2 viruses in clinical specimens...
November 2, 2017: Journal of Virological Methods
https://www.readbyqxmd.com/read/29093329/the-emerging-picture-of-mast-cell-activation-the-complex-regulatory-network-of-high-affinity-receptor-for-immunoglobulin-e-signaling
#13
Ryo Suzuki
It is now well known that immunoglobulin E (IgE) and mast cells (MCs) are important participants in allergic diseases. MCs contain electron-dense secretory granules which are filled with inflammatory mediators. The interaction of an allergen (antigen) with an antigen-specific IgE-bound high-affinity receptor for IgE (FcεRI) is an essential step in MC activation as well as subsequent downstream signaling events. What we know is that IgE and FcεRI activate a complex regulatory network (i.e., signaling molecules and messengers) that governs both the type of MC activation and the symptoms of allergic disease...
2017: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/29077887/effects-of-dietary-supplementation-with-enzymatically-treated-artemisia-annua-on-growth-performance-intestinal-morphology-digestive-enzyme-activities-immunity-and-antioxidant-capacity-of-heat-stressed-broilers
#14
Z H Song, K Cheng, X C Zheng, H Ahmad, L L Zhang, T Wang
The gastrointestinal tract is considered as one of the main target organs affected by heat stress. Phytogenic feed additives containing phenolics and flavonoids can improve the resistance of broilers to heat stress. This study was conducted to investigate the effects of dietary supplementation with enzymatically treated Artemisia annua (EA) on growth performance, intestinal morphology, digestive enzyme activities, immunity and antioxidant capacity of broilers challenged with heat stress. One hundred and forty-four 21-day-old male Arbor Acres broilers were randomly distributed into 3 treatments: 1) non-challenged control (CON); 2) heat-stress-challenged control (HS); and 3) heat-stress-challenged group + 1 g EA/kg diet (HS-EA)...
October 25, 2017: Poultry Science
https://www.readbyqxmd.com/read/29075899/immunoglobulin-a-and-liver-diseases
#15
REVIEW
Tatsuo Inamine, Bernd Schnabl
Immunoglobulin A (IgA) is a major immunoglobulin isotype in the gut and plays a role in maintenance of gut homeostasis. Secretory IgA (SIgA) has multiple functions in the gut, such as to regulate microbiota composition, to protect intestinal epithelium from pathogenic microorganisms, and to help for immune-system development. The liver is the front-line organ that receives gut-derived products through the portal vein, implying that the liver could be severely affected by a disrupted intestinal homeostasis. Indeed, some liver diseases like alcoholic liver disease are associated with an altered composition of gut microbiota and increased blood endotoxin levels...
October 26, 2017: Journal of Gastroenterology
https://www.readbyqxmd.com/read/29068402/oral-delivery-of-probiotics-expressing-dendritic-cell-targeting-peptide-fused-with-porcine-epidemic-diarrhea-virus-coe-antigen-a-promising-vaccine-strategy-against-pedv
#16
Xiaona Wang, Li Wang, Xuewei Huang, Sunting Ma, Meiling Yu, Wen Shi, Xinyuan Qiao, Lijie Tang, Yigang Xu, Yijing Li
Porcine epidemic diarrhea virus (PEDV), an enteric coronavirus, is the causative agent of porcine epidemic diarrhea (PED) that damages intestinal epithelial cells and results in severe diarrhea and dehydration in neonatal suckling pigs with up to 100% mortality. The oral vaccine route is reported as a promising approach for inducing protective immunity against PEDV invasion. Furthermore, dendritic cells (DCs), professional antigen-presenting cells, link humoral and cellular immune responses for homeostasis of the intestinal immune environment...
October 25, 2017: Viruses
https://www.readbyqxmd.com/read/29066918/asthma-with-bronchial-hypersecretion-expression-of-mucins-and-toll-like-receptors-in-sputum-and-blood
#17
Astrid Crespo-Lessmann, Eder Mateus, Montserrat Torrejón, Alicia Belda, Jordi Giner, Silvia Vidal, Oriol Sibila, Vicente Plaza
Asthma with bronchial hypersecretion is a type of asthma that is poorly studied. Its pathogenesis is not well understood, but is probably related to innate impaired immunity, particularly with toll-like receptors (TLRs) and secretory mucins (MUC). OBJECTIVES: 1) Define the clinical and inflammatory phenotype of asthma with bronchial hypersecretion of mucus. 2) Compare the type of mucin present in induced sputum (IS) of patients with and without bronchial hypersecretion. 3) Determine the expression of TLRs in IS and blood of asthmatics with and without bronchial hypersecretion...
2017: Journal of Asthma and Allergy
https://www.readbyqxmd.com/read/29052012/effect-of-nasal-antihistamine-on-secretory-iga-in-nasal-lavage-of-rats
#18
Remzi Doğan, Fadlullah Aksoy, Seda Sezen Goktas, Ilker Kocak, Yavuz Selim Yıldırım, Said Incir, Orhan Özturan
The humoral IgA is an immunoglobulin which plays a defensive role for organisms on mucosal surfaces. Today, intranasal antihistamines are effectively used in the treatment of allergic rhinitis. In our study, the effect of azelastine hydrochloride-a nasal antihistaminic-on humoral IgA of the nasal mucosa has been reviewed empirically. Twenty-four female Sprague-Dawley rats were included in our study. The rats were divided into three groups randomly. Group 1(azelastine hydrochloride): rats in this group had nasal azelastine hydrochloride (0...
October 19, 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/29032226/maternal-depressive-symptoms-linked-to-reduced-fecal-immunoglobulin-a-concentrations-in-infants
#19
Liane J Kang, Petya T Koleva, Catherine J Field, Gerald F Giesbrecht, Eytan Wine, Allan B Becker, Piushkumar J Mandhane, Stuart E Turvey, Padmaja Subbarao, Malcolm R Sears, James A Scott, Anita L Kozyrskyj
Secretory Immunoglobulin A (sIgA) plays a critical role to infant gut mucosal immunity. Delayed IgA production is associated with greater risk of allergic disease. Murine models of stressful events during pregnancy and infancy show alterations in gut immunity and microbial composition in offspring, but little is known about the stress-microbiome-immunity pathways in humans. We investigated differences in infant fecal sIgA concentrations according to the presence of maternal depressive symptoms during and after pregnancy...
October 12, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28984027/influence-of-a-preschool-preventive-dental-programme-on-caries-prevalence-oral-care-and-secretory-immunity-to-streptococcus-mutans-in-young-adults
#20
K L Aida, S de Paula Ramos, G F Seixas, A Bozza, R S Couto de Almeida, C C Dezan Garbelini
OBJECTIVE: To evaluate oral hygiene habits, decayed, missing and filled teeth (DMFT) and surfaces (DMFS), dental care, dietetic habits and anti-Streptococcus mutans salivary secretory Immunoglobulin A (SIgA) in young adults who attended a preventive programme during preschool age. MATERIAL AND METHODS: The study group (Baby Clinic) comprised 72 patients, aged 18-25 years, who had participated in the Baby Clinic preventive programme. The control group was age- and gender-matched...
October 6, 2017: International Journal of Dental Hygiene
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