title: Enhancement of non-heme iron absorption by anchovy (Engraulis japonicus) muscle protein hydrolysate involves a nanoparticle-mediated mechanism.
abstract: The mechanisms by which meat enhances human absorption of non-heme iron remain unknown. Recently, anchovy (Engraulis japonicus) muscle protein hydrolysate (AMPH) was found to mediate the formation of nanosized ferric hydrolysis products in vitro. The current paper evaluates the effects of AMPH on the bioavailability and the intestinal speciation of non-heme iron in rats, followed by an investigation of cellular uptake pathways of in vitro-formed AMPH-stabilized nanosized ferric hydrolysis products (ANPs) by polarized human intestinal epithelial (Caco-2) cells. The hemoglobin regeneration efficiencies in anemic rats followed the order ferric citrate (9.79 ± 2.02%) < commercial bare α-Fe2O3 nanoparticles (16.37 ± 6.65%) < mixture of ferric citrate and AMPH (40.33 ± 6.36%) ≈ ferrous sulfate (40.88 ± 7.67%) < ANPs (56.25 ± 11.35%). Percentage contents of intestinal low-molecular-weight iron in the groups of FC+AMPH, FeSO4, and ANPs were significantly lower than the corresponding hemoglobin regeneration efficiencies (P < 0.05), providing strong evidence for the involvement of nanosized iron in intestinal iron absorption from FC+AMPH, FeSO4, and ANPs. Calcein-fluorescence measurements of the labile iron pool of polarized Caco-2 cells revealed the involvement of both divalent transporter 1 and endocytosis in apical uptake of ANPs, with endocytosis dominating at acidic extracellular pH. Overall, AMPH enhancement of non-heme iron absorption involves a nanoparticle-mediated mechanism.
authors: College of Food Science and Engineering, Ocean University of China , 5 Yushan Road, Qingdao, Shandong Province 266003, China.
authors: Haohao
authors: H
authors: Wu
authors: Suqin
authors: S
authors: Zhu
authors: Mingyong
authors: M
authors: Zeng
authors: Zunying
authors: Z
authors: Liu
authors: Shiyuan
authors: S
authors: Dong
authors: Yuanhui
authors: Y
authors: Zhao
authors: Hai
authors: H
authors: Huang
authors: Y Martin
authors: YM
authors: Lo
mesh_terms: D000740:Anemia / Q000178:diet therapy / Q000378:metabolism* / Q000503:physiopathology; D000818:Animals; D001682:Biological Availability; D018938:Caco-2 Cells; D005260:Female; D029941:Fish Proteins / Q000737:chemistry / Q000378:metabolism*; D005399:Fishes; D006801:Humans; D006868:Hydrolysis; D007408:Intestinal Absorption; D007413:Intestinal Mucosa / Q000378:metabolism*; D007422:Intestines / Q000503:physiopathology; D007501:Iron / Q000737:chemistry / Q000378:metabolism*; D008297:Male; D053758:Nanoparticles / Q000737:chemistry / Q000378:metabolism; D051381:Rats; D017747:Seafood / Q000032:analysis*
chemical_list: D029941:Fish Proteins; D007501:Iron