title: Enzymatically-Processed Wheat Bran Enhances Macrophage Activity and Has in Vivo Anti-Inflammatory Effects in Mice.
abstract: Wheat bran is a rich source of dietary fiber, of which arabinoxylan is the most abundant non-starch polysaccharide. Arabinoxylan has been known to exert in vivo immunological activities. Based on prior findings, we pretreated wheat bran with enzymatic hydrolysis to increase the release of soluble arabinoxylan and investigated whether oral administration of wheat bran altered macrophage activity in a mouse model. After four weeks of treatment, we isolated peritoneal macrophages for phagocytic receptor analysis and lipopolysaccharide (LPS)-induced inflammatory changes. In the second experiment, mice given wheat bran were intraperitoneally stimulated with LPS and serum levels of pro- and anti-inflammatory cytokines were determined. The expression of SRA and CD36, and phagocytic activity increased (p < 0.05, respectively). Ex vivo stimulation of macrophages by LPS resulted in reduced surface expression of CD40 (p < 0.05) and decreased production of nitric oxide (p < 0.005), tumor necrosis factor (TNF)-α (p < 0.005), interleukin (IL)-6 (p < 0.01), and IL-12 (p < 0.05). Mice treated with wheat bran showed decreased levels of serum TNF-α and IL-6 (p < 0.05, respectively) and an increased level of serum anti-inflammatory IL-10 (p < 0.05) in response to intraperitoneal LPS. Enzymatically-processed wheat bran boosts macrophage phagocytic capacity possibly through up-regulation of scavenger receptors and confers anti-inflammatory effects, indicating its potential as an immuno-enhancing functional food.
authors.affiliation: Department of East-West Medical Science, Graduate School of East-West Medical Science, Kyung Hee University, Yongin 17104, Korea. shehee@khu.ac.kr.
authors.forename: Hee
authors.initials: H
authors.lastname: Kang
authors.affiliation: Bio-Center, Gyeonggi Institute of Science and Technology Promotion, Suwon 16229, Korea. migi@gstep.re.kr.
authors.forename: Mi-Gi
authors.initials: MG
authors.lastname: Lee
authors.affiliation: DongA One Corporation, Dangjin 31703, Korea. macmen@kodoco.com.
authors.forename: Jae-Kang
authors.initials: JK
authors.lastname: Lee
authors.affiliation: DongA One Corporation, Dangjin 31703, Korea. camdol@kodoco.com.
authors.forename: Yong-Hyun
authors.initials: YH
authors.lastname: Choi
authors.affiliation: DongA One Corporation, Dangjin 31703, Korea. knownet@kodoco.com.
authors.forename: Yong-Seok
authors.initials: YS
authors.lastname: Choi
mesh_terms: D000818:Animals; D000893:Anti-Inflammatory Agents / Q000494:pharmacology*; D016207:Cytokines / Q000235:genetics / Q000378:metabolism; D004043:Dietary Fiber; D004798:Enzymes / Q000737:chemistry / Q000378:metabolism*; D005511:Food Handling; D005786:Gene Expression Regulation / Q000187:drug effects; D007249:Inflammation; D008070:Lipopolysaccharides / Q000633:toxicity; D017737:Macrophages, Peritoneal / Q000187:drug effects*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D009569:Nitric Oxide / Q000378:metabolism
chemical_list: D000893:Anti-Inflammatory Agents; D016207:Cytokines; D004043:Dietary Fiber; D004798:Enzymes; D008070:Lipopolysaccharides; D009569:Nitric Oxide
keywords: arabinoxylan; functional food; inflammation; macrophage; wheat bran