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      Quantification of secretory IgA and mucin excretion and their contributions to total endogenous amino acid losses in roosters that were fasted or precision-fed a nitrogen-free diet or various highly digestible protein sources

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          Abstract

          The objective of this study was to quantify total secretory IgA ( sIgA) and mucin excretion via excreta in roosters fed diets containing highly digestible protein sources and to determine their proportional contributions to total endogenous amino acid ( AA) losses. Precision-fed rooster assays with 24 h excreta collections were conducted using conventional White Leghorn roosters (4–8 roosters per treatment). In Experiment 1, roosters were fasted or precision-fed 30 g (crop intubation) of a nitrogen-free ( NF) or semi-purified diet containing 10% casein. Roosters in Experiment 2 received a NF or semi-purified diet containing either 10% casein, 17% whole egg, 10% egg white, 9.8% soy protein isolate, 10.2% chicken breast meat, 11.2% spray-dried animal plasma ( SDAP), or an AA mixture containing the same AA as casein. A Latin square design was used in Experiment 3, where roosters received NF or semi-purified diets containing either 10% casein, 17% whole egg, or 9.6% of a crystalline AA mixture to evaluate both diet and individual bird effects. In Experiment 1, mucin excretion did not differ ( P > 0.05) among treatments; however, total sIgA excretion was lower for fasted birds, intermediate for the NF diet, and highest for casein ( P < 0.05). Total endogenous AA losses (proportion of the total) from sIgA were higher for roosters fed casein, whereas mucin contributions were higher for fasted roosters ( P < 0.05). In Experiment 2, sIgA excretion did not differ ( P > 0.05) among treatments; however, mucin excretion was reduced for NF, whole egg, egg white, and chicken breast compared with casein and SDAP. In Experiment 3, sIgA and mucin excretion did not differ ( P > 0.05) among treatments; however, sIgA excretion differed among individual roosters (7–27 mg/24 h; P < 0.05). Overall, fasting reduced sIgA excretion and sIgA and mucin excretion were affected by dietary protein source. Further, roosters excreted a substantial amount of sIgA, and sIgA and mucin were considerable contributors to total endogenous AA losses.

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          Mucin dynamics and enteric pathogens.

          The extracellular secreted mucus and the cell surface glycocalyx prevent infection by the vast numbers of microorganisms that live in the healthy gut. Mucin glycoproteins are the major component of these barriers. In this Review, we describe the components of the secreted and cell surface mucosal barriers and the evidence that they form an effective barricade against potential pathogens. However, successful enteric pathogens have evolved strategies to circumvent these barriers. We discuss the interactions between enteric pathogens and mucins, and the mechanisms that these pathogens use to disrupt and avoid mucosal barriers. In addition, we describe dynamic alterations in the mucin barrier that are driven by host innate and adaptive immune responses to infection.
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            Multi-Faceted Functions of Secretory IgA at Mucosal Surfaces

            Secretory IgA (SIgA) plays an important role in the protection and homeostatic regulation of intestinal, respiratory, and urogenital mucosal epithelia separating the outside environment from the inside of the body. This primary function of SIgA is referred to as immune exclusion, a process that limits the access of numerous microorganisms and mucosal antigens to these thin and vulnerable mucosal barriers. SIgA has been shown to be involved in avoiding opportunistic pathogens to enter and disseminate in the systemic compartment, as well as tightly controlling the necessary symbiotic relationship existing between commensals and the host. Clearance by peristalsis appears thus as one of the numerous mechanisms whereby SIgA fulfills its function at mucosal surfaces. Sampling of antigen-SIgA complexes by microfold (M) cells, intimate contact occurring with Peyer’s patch dendritic cells (DC), down-regulation of inflammatory processes, modulation of epithelial, and DC responsiveness are some of the recently identified processes to which the contribution of SIgA has been underscored. This review aims at presenting, with emphasis at the biochemical level, how the molecular complexity of SIgA can serve these multiple and non-redundant modes of action.
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              The Frontiers Publishing Paradigm

              Digital technology has created the possibility of a paradigm shift in scientific publishing for the first time in four centuries. Traditional, high impact publishing largely relies on the publication of only a limited number of papers, which are highly selected by the editors and reviewers aiming at the highest “impact” on the field. As a consequence, the journal's publications may be frequently referenced by investigators in the field, much to the benefit of a journal's impact factor. In general, a high impact factor is sought after by the publishers and scientists alike as the gold standard of the excellence of the journal, promoting the widest distribution of new findings to the scientific community and essentially giving the publisher a reputation without regard to any individual articles. For a restricted-access journal, a high impact factor is of course further desirable to promote subscriptions and advertising, and eventually ensure a lucrative return. In a way, the traditional restricted-access system of scientific publishing is geared to reject submitted papers, forcing a bet between the high cost of printing what may be a “mediocre” scientific article and the assignment of a high impact factor which translates directly into revenue. Most of the highest impact journals publish only ∼10% of the papers submitted for review, and proudly tout these numbers as a sign of their exclusivity. For example, Science states that “Because of the stiff competition for space in the journal, Science now accepts less than 8% of the original research papers submitted. About 80% of submitted manuscripts are rejected during an initial screening stage by the Staff Editors and the Board of Reviewing Editors” (see Science info for authors – FAQ). In this author's opinion, this system of peer review is flawed. In order to reduce the number of manuscripts sent for review, so as to reduce the workload, editors who are not, or no longer, practicing scientists, make the editorial decision whether to send a paper for review. This decision is often driven by the familiarity of the editor with the topic or the fame of the authors of the manuscript, and not necessarily based on a thorough reading and understanding of the contents of the paper. Accordingly, many submitted papers do not make it past this first “cut.” A manuscript that does make it into the review system can easily become the victim of politics within the scientific community, as the reviewers and authors are often directly competing groups. The reviewer then wields formidable power in rejecting or delaying the acceptance of a manuscript as long as possible, making the time interval from submission to eventual publication over 1 year. The reviewers may request additional experiments and data for completely valid scientific reasons to improve the manuscript, but do not necessarily realize that at some point the authors are forced to compromise the quality of the figures or clarity of the explanations in order to still abide by journal-imposed length restrictions. This has led to supplementary online material (SOM) flourishing over the past decade, with one of my own recently submitted manuscripts weighing in at more than 85 pages. The pointless irony of all these flaws in the traditional restricted-access publishing system is that everything is based on an outdated business model of the print technology. The question we must ask ourselves is whether we can evolve from the established “restricted-access,” reader-funded publishing practice to an “open access,” author-funded publishing industry managed by scientists themselves by leveraging the internet age. In this regard, it is noteworthy that the costs of publishing with Frontiers are equivalent to the “page charges” levied by the traditional restricted-access publishers. In the Frontiers review process, authors submit their manuscripts to the Associate Editors, who assign two Review Editors for most manuscript types. These editors are charged with evaluating and certifying, in the most rigorous way, the accuracy of articles to ensure the dissemination of as much of the total amount of scientific information as possible. To facilitate this process, the Frontiers review forum has been designed to foster interaction between authors and review editors, with the overall goal of improving the manuscript – rather than finding flaws with the intention to reject. This renders the peer review process interactive and author-friendly for the first time. Review Editors are responsible for the validating the flawlessness of the experiments performed and data presented, and for the legibility and clarity of the manuscript. If the Review Editors have uncovered issues with the manuscript, the Review Editors communicate anonymously in a blog-style discussion forum with the authors to resolve the issues. If a consensus is reached with the issues resolved to the satisfaction of both of the Review Editors and the authors, the Associate Editor can accept the manuscript. One important departure from the traditional publishing system is that if the manuscript is accepted and published, the reviewers’ names are also published, thereby ensuring reviewer transparency and objectivity. This is the point where the Frontiers publishing paradigm shifts 180° from the old-fashioned traditional publishing methods. The editors are charged with using their experience and expertise to improve the manuscript to the stage where it is acceptable for publication, and not to simply reject it out of hand! However, if the issues cannot be reconciled to the satisfaction of everyone, then the manuscript is rejected and the reviewers remain anonymous to the authors. Obviously, quantity does not equal quality, and researchers entrenched in the traditional publishing paradigm are often initially suspicious that the author-pay open access model will fail to safeguard quality. Scientific reputations are, after all, derived from the quality as well as the quantity of one's publications, and therefore, the reputations of both authors and Frontiers are on the line. Accordingly, Frontiers has adopted the motto of The New York Times, “All the news fit to print,” so that Frontiers in Immunology will accept and publish “All the science deserved to be known!” Another growth of the grassroots Frontiers publishing paradigm is the tiered publishing system, a democratic meritocracy highlighting the quality of individual papers deemed important by the entire community of scientists. Article-level metrics based on actual views and downloads replace the journal-level impact factor that is calculated from the number of references to the entire journal. Authors can follow their own papers’ Impact Stats from the date of acceptance. Over the first 6 months after publication, the number of times an individual paper is accessed, and the number of times it is downloaded, is tracked electronically. The authors of the most accessed original research from the first tier, meaning the Specialty Journals, are effectively electronically nominated by the article tracking numbers to write a “tier 2” article on the same subject, but geared toward a broader audience and thus placing the findings in a broader context. This Focused Review would be published on the general Frontiers in Immunology site, and not in a specialty section. The Reviewers and Editor of this prestigious article are then also invited to submit a Frontiers Commentary on the article, which is also featured in Frontiers in Immunology. In other words, the whole community of scientific peers – rather than the publisher's editorial staff – democratically selects the highest quality papers for recognition based on actual readership. The quality of a Frontiers paper is also ensured by the policies of the construction of the manuscript, as “space” is no longer limited. SOM is kept to a minimum and consists of material that should be in an appendix, such as equations or nucleotide sequence data, and not simply additional text, data, and figures. This allows the authors to place all relevant data and figures in the main body of the paper, so that the reader can easily access and understand the figures, as well as the text. Accordingly, it is the authors’ care in telling a full story and their creativity in the construction of the figures/tables illustrating it that earn recognition, and not simply what prestigious high impact journal in which the final paper appears. For all of these reasons, publishing in Frontiers in Immunology promises to be an enjoyable and useful experience for authors. Ever since scientific publishing began in the seventeenth century, we have been at the mercy of the publishers. Like Rock and Roll artists, we have written the songs and sung the songs, but then we have given up ownership of our creative efforts to the record companies, which have controlled their distribution. Moreover, the traditional publishing companies have charged us for publishing our songs, as well the readers, and then walked away with the proceeds! No more! Frontiers authors retain the copyright to their own work. Just like Steve Jobs revolutionized the music industry with the iPod and iTunes, publishing with Frontiers promises to revolutionize scientific communication!
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                Author and article information

                Contributors
                Journal
                Poult Sci
                Poult Sci
                Poultry Science
                Elsevier
                0032-5791
                1525-3171
                03 February 2023
                April 2023
                03 February 2023
                : 102
                : 4
                : 102554
                Affiliations
                [* ]Department of Poultry Science, University of Arkansas, Fayetteville, AR 72701, USA
                []Department of Animal Sciences, University of Illinois, Urbana-Champaign, IL 61801, USA
                Author notes
                [1 ]Corresponding author: jemmert@ 123456illinois.edu
                Article
                S0032-5791(23)00078-0 102554
                10.1016/j.psj.2023.102554
                10006854
                36878100
                7f168e75-9833-4d30-ae3b-d5e1f259b9fe
                © 2023 The Authors

                This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

                History
                : 18 November 2022
                : 30 January 2023
                Categories
                METABOLISM AND NUTRITION

                amino acid digestibility,crude mucin,endogenous amino acid,precision-fed rooster assay,secretory iga

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