New insights into the mechanisms of iron absorption:Iron dextran uptake in the intestines of weaned pigs through glucose transporter 5(GLUT5)and divalent metal transporter 1(DMT1)transporters  

作　　者：Shengting Deng Weiguang Yang Chengkun Fang Haosheng He Jiamin Liu Rejun Fang 

机构地区：[1]College of Animal Science and Technology,Hunan Agricultural University,Changsha 410128,China [2]Hunan Engineering Research Center of Intelligent Animal Husbandry,Changsha 410128,China

出　　处：《Animal Nutrition》2024年第4期25-40,共16页动物营养(英文版)

基　　金：financially supported by the Hunan Engineering Research Center of Intelligent Animal Husbandry(grant number:20211231GCZX)of China;Evaluation of the Effectiveness of Iron Dextran Supplementation in Pig Diets(grant number,2022xczx-214)of Hunan Agricultural University.

摘　　要：The purpose of this study was to gain insight into the mechanism of iron dextran(DexFe)absorption in the intestines.A total of 72 piglets(average BW=7.12±0.75 kg,male to female ratio=1:1)weaned at 28 d of age were randomly divided into two treatment groups with six replicates for each group.The experimental diets included the basal diet supplemented with 100 mg/kg iron dextran(DexFe group)and the basal diet supplemented with 100 mg/kg FeSO_(4)$H_(2)O(CON group).The experiment lasted for 28 d.The piglets'intestinal iron transport was measured in vitro using an Ussing chamber.Porcine intestinal epithelial cell line(IPEC-J2)cells were used to develop a monolayer cell model that explored the molecular mechanism of DexFe absorption.Results showed that compared to the CON group,the ADG of pigs in the DexFe group was improved(P=0.022),while the F/G was decreased(P=0.015).The serum iron concentration,apparent iron digestibility,and iron deposition in the duodenum,jejunum,and ileum were increased(P<0.05)by dietary DexFe supplementation.Piglets in the DexFe group had higher serum red blood count,hemoglobin,serum iron content,serum ferritin and transferrin levels and lower total iron binding capacity(P<0.05).In the Ussing chamber test,the iron absorption rate of the DexFe group was greater(P<0.001)than the CON group,and there was no significant difference between the DexFe group and the glucose group(P>0.05).Furthermore,when compared to the CON group,DexFe administration improved(P<0.05)SLC2A5 gene and glucose transporter 5(GLUT5)protein expression but had no effect(P>0.05)on SLC11A2 gene or divalent metal transporter 1(DMT1)protein expression.Once the GLUT5 protein was suppressed,the iron transport rate and apparent permeability coefficient were decreased(P<0.05)in IPEC-J2 monolayer cell models.The findings suggest the effectiveness of DexFe application in weaned piglets and revealed for the first time that DexFe absorption in the intestine is closely related to the glucose transporter GLUT5 protein channel.

关 键 词：Iron dextran Weaned piglet Divalent metal transporter 1 Glucose transporter 5 Intestinal iron absorption 

分 类 号：R73[医药卫生—肿瘤]