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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.18.0874    [Accepted] Published online March 7, 2019.
The enhancing effect of Acanthopanax sessiliflorus fruit extract on the antibacterial activity of porcine alveolar 3D4/31 macrophages via NF-κB1 and lipid metabolism regulation
Eunmi Hwang1  , Gye Won Kim2, Ki Duk Song3  , Hak-Kyo Lee3,*, Sung-Jo KIM1,* 
1Division of Cosmetics and Biotechnology, College of Life and Health Sciences, Hoseo University, Baebang, Asan, Chungnam 31499, Korea
2Brewing Research Center, Academic Industry Cooperation, Hankyong National University, Anseong, 17579, Korea
3Department of Animal Biotechnology, Chonbuk National University, Jeonju 54896, Korea
Correspondence:  Hak-Kyo Lee,Email: breedlee@jbnu.ac.kr
Sung-Jo KIM, Tel: +82-10-7268-9981, Fax: +82-41-540-9538, Email: sungjo@hoseo.edu
Received: 21 November 2018   • Revised: 19 January 2019   • Accepted: 21 February 2019
Abstract
Objective: The demand for measures to improve disease resistance and productivity of livestock are increasing, as most countries prohibit the addition of antibiotics to feed. This study therefore aimed to uncover functional feed additives to help enhance livestock immunity and disease resistance, using Acanthopanax sessiliflorus fruit extract (ASF).

Methods

ASF was extracted with 70% EtOH, and total polyphenolic and catechin contents were measured by the Folin-Ciocalteu and vanillin assay, respectively. The 3D4/31 porcine macrophage cells (MΦ) were activated by Phorbol 12-Myristate 13-Acetate (PMA), and cell survival and growth rate were measured with or without ASF treatment. Flow-cytometric analysis determined the lysosomal activity, reactive oxygen species levels (ROS), and cell cycle distribution. Nuclear factor kappa B (NF-κB) and superoxide dismutase (SOD) protein expression levels were quantified by western blotting and densitometry analysis. Quantitative PCR was applied to measure the lipid metabolism-related genes expression level. Lastly, the antibacterial activity of 3D4/31 MΦ cells was evaluated by the colony forming unit assay.

Results

ASF upregulated the cell viability and growth rate of 3D4/31 MΦ, with or without PMA activation. Moreover, lysosomal activity and intracellular ROS levels were increased after ASF exposure. In addition, the antioxidant enzyme SOD2 expression levels were proportionately increased with ROS levels. Both ASF and PMA treatment resulted in upregulation of NF-κB protein, tumor necrosis factor (TNF) α mRNA expression levels, lipid synthesis, and fatty acid oxidation metabolism. Interestingly, co-treatment of ASF with PMA resulted in recovery of NF-κB, TNFα, and lipid metabolism levels. Finally, ASF pretreatment enhanced the in vitro bactericidal activity of 3D4/31 MΦ against Escherichia coli.

Conclusions

This study provides a novel insight into the regulation of NF-κB activity and lipid metabolism in MΦ, and we anticipate that ASF has the potential to be effective as a feed additive to enhance livestock immunity.
Keywords: Porcine; Feed additives; Acanthopanax sessiliflorus; Macrophages; NF-κB; Immunity
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