title: Manganese source affects manganese transport and gene expression of divalent metal transporter 1 in the small intestine of broilers.
abstract: In the present study, two experiments were conducted to investigate the effect of Mn source on Mn transport and the expression of a Mn transporter, divalent metal transporter 1 (DMT1), in the small intestine of broilers. In Expt 1, in situ ligated duodenal loops from Mn-deficient chicks (29-d-old) were perfused with solutions containing 0-8.74 mmol Mn/l from either MnSO4, or one of two organic chelates of Mn and amino acids with moderate (OM) or strong (OS) chelation strength (Q(f)) up to 30 min. In Expt 2, Mn-deficient intact broilers (14-d-old) were fed a control diet (12.45 mg Mn/kg) or the control diet supplemented with 100 mg Mn/kg as one of all Mn sources for 14 d. The uptake kinetics of Mn from different Mn sources in the ligated duodenal loops followed a saturable process as determined by regression analysis of concentration-dependent uptake rates. The maximum transport rate (Jmax) and K(m) values, and DMT1 mRNA levels in the ligated duodenal loops were higher (P < 0.01) for OM and OS than for MnSO4. DMT1 mRNA levels were much higher (P < 0.01) in the duodenum than in the jejunum and ileum. Both DMT1 mRNA levels in the duodenum and plasma Mn contents from the hepatic portal vein of intact chicks on day 14 post-feeding increased (P < 0.05) in the following order: control < MnSO4 < OM < OS. These results indicated that organic Mn sources with stronger Q(f) showed higher Mn transport and absorption, and DMT1 might be involved in the regulation of organic Mn transport in the proximal small intestine of broilers.
authors.affiliation: Mineral Nutrition Research Division, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Haidian, Beijing, People's Republic of China.
authors.forename: Shi-Ping
authors.initials: SP
authors.lastname: Bai
authors.forename: Lin
authors.initials: L
authors.lastname: Lu
authors.forename: Rui-Lian
authors.initials: RL
authors.lastname: Wang
authors.forename: Lin
authors.initials: L
authors.lastname: Xi
authors.forename: Li-Yang
authors.initials: LY
authors.lastname: Zhang
authors.forename: Xu-Gang
authors.initials: XG
authors.lastname: Luo
mesh_terms: D000596:Amino Acids / Q000737:chemistry; D000821:Animal Feed / Q000032:analysis; D000818:Animals; D030161:Avian Proteins / Q000235:genetics / Q000378:metabolism*; D027682:Cation Transport Proteins / Q000235:genetics / Q000378:metabolism*; D002614:Chelating Agents / Q000008:administration & dosage / Q000737:chemistry; D002645:Chickens / Q000097:blood / Q000254:growth & development / Q000378:metabolism*; D002681:China; D003677:Deficiency Diseases / Q000178:diet therapy / Q000378:metabolism / Q000662:veterinary; D004386:Duodenum / Q000254:growth & development / Q000378:metabolism; D005786:Gene Expression Regulation; D007408:Intestinal Absorption; D007421:Intestine, Small / Q000254:growth & development / Q000378:metabolism*; D007700:Kinetics; D008297:Male; D008345:Manganese / Q000008:administration & dosage* / Q000172:deficiency / Q000378:metabolism / Q000627:therapeutic use; D017895:Manganese Compounds / Q000008:administration & dosage; D009928:Organ Specificity; D009994:Osmolar Concentration; D011201:Poultry Diseases / Q000178:diet therapy / Q000378:metabolism; D013431:Sulfates / Q000008:administration & dosage; D000099236:Solute Carrier Family 11, Member 2
chemical_list: D000596:Amino Acids; D030161:Avian Proteins; D027682:Cation Transport Proteins; D002614:Chelating Agents; D008345:Manganese; D017895:Manganese Compounds; D013431:Sulfates; D000099236:Solute Carrier Family 11, Member 2; C039798:manganese sulfate