4.7 Article

Effects of Hericium erinaceus polysaccharide on immunity and apoptosis of the main immune organs in Muscovy duck reovirus-infected ducklings

Journal

INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 171, Issue -, Pages 448-456

Publisher

ELSEVIER
DOI: 10.1016/j.ijbiomac.2020.12.222

Keywords

Hericium erinaceus polysaccharide; Muscovy duck reovirus; Immunity; Apoptosis

Funding

  1. Science and Technology Innovation Foundation of FAFU [CXZX2018023]
  2. Discipline Development Grant fromCollege of Animal Sciences FAFU [2018K005]
  3. Natural Science Foundation of China [31372474]

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The study showed that Hericium erinaceus polysaccharide (HEP) can reduce immunosuppression caused by Muscovy duck reovirus (MDRV) by decreasing organ injuries, improving antioxidant capacity, serum proteins levels, antibody levels, complement levels, and reducing apoptosis through lowering the FADD and CytC levels.
To investigate the effects of Hericium erinaceus polysaccharide (HEP) on immunity in Muscovy duck reovirus (MDRV)-infected ducklings and explore its mechanism of action, an MDRV contact-infection model was established. Then, we investigated the influence of HEP on morphology of main immune organs in MDRV-infected ducklings by HE staining, while antioxidant capacity (T-AOC, MDA), serum protein levels (TP, ALB, GLO), complement levels (C-3, C-4) and antibody levels (IgA, IgM, IgG) were detected. Apoptotic indexes (apoptosisi rate and FAS-L) were also quantified by TUNEL method and immunohistochemical staining. Meanwhile, FADD and CytC (apoptosis-related genes), were tested by quantitative RT-PCR. Results showed that HEP could reduce the injuries of immune organs caused by MDRV. Additionally, HEP markedly diminished MDA (p < 0.01), while significantly increased T-AOC, TP, ALB, GLO, C-3, C-4, IgA, IgM and IgG (p < 0.01 or p < 0.05). Then, HEP shifted apoptosis time to an early MDRV-infected stage and reduced apoptosis at later MDRVinfected stage. This was associated with changes of FADD and CytC. Collectively, our data suggested that HEP could reduce the immunesuppression by many ways, such as decreasing organs' injuries, improving antioxidant capacity, serumproteins levels, antibody levels and complement levels, while diminish the apoptosis by lowering the FADD and CytC. (C) 2021 Elsevier B.V. All rights reserved.

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