title: Influence of DMT1 and iron status on inflammatory responses in the lung.
abstract: Divalent metal transporter 1 (DMT1) is the major iron transporter responsible for duodenal dietary iron absorption and is required for erythropoiesis. Recent studies suggest that loss of DMT1 activity could be involved in metal-related lung injury, but little is known about the effects of iron status and DMT1 function on pulmonary inflammation. To better define the role of DMT1 and iron status in pulmonary inflammatory responses, we performed bronchoalveolar lavage (BAL) following intratracheal instillation of lipopolysaccharide (LPS) to the Belgrade rat, an animal model deficient in DMT1 function. In the basal state, the BAL fluid of Belgrade rats had more macrophages and higher lactate dehydrogenase, myeloperoxidase, albumin, and hemoglobin levels compared with heterozygote control rats. Following LPS instillation, the macrophage fraction relative to total BAL cell content and levels of albumin and IgM were increased in Belgrade rats compared with controls. In contrast, heterozygote Belgrade rats made anemic by diet-induced iron deficiency exhibited attenuated inflammatory responses to LPS. These combined results show that pulmonary inflammation can be modified by both DMT1 and iron status. Loss of DMT1 alters pulmonary responses necessary for lung homeostasis in the basal state and enhances LPS-induced inflammation and therefore would contribute to progression of lung injury.
authors.affiliation: Department of Genetics and Complex Diseases, Harvard School of Public Health, Boston, Massachusetts, USA.
authors.forename: Jonghan
authors.initials: J
authors.lastname: Kim
authors.forename: Ramon M
authors.initials: RM
authors.lastname: Molina
authors.forename: Thomas C
authors.initials: TC
authors.lastname: Donaghey
authors.forename: Peter D
authors.initials: PD
authors.lastname: Buckett
authors.forename: Joseph D
authors.initials: JD
authors.lastname: Brain
authors.forename: Marianne
authors.initials: M
authors.lastname: Wessling-Resnick
mesh_terms: D000818:Animals; D001992:Bronchoalveolar Lavage Fluid / Q000166:cytology; D027682:Cation Transport Proteins / Q000378:metabolism*; D048430:Cell Shape / Q000187:drug effects; D004912:Erythrocytes / Q000187:drug effects / Q000378:metabolism / Q000473:pathology; D007501:Iron / Q000378:metabolism*; D008070:Lipopolysaccharides / Q000494:pharmacology; D008168:Lung / Q000187:drug effects / Q000378:metabolism* / Q000473:pathology*; D011014:Pneumonia / Q000378:metabolism* / Q000473:pathology*; D051381:Rats; D014132:Trachea / Q000187:drug effects / Q000378:metabolism / Q000473:pathology; D000099236:Solute Carrier Family 11, Member 2
chemical_list: D027682:Cation Transport Proteins; D007501:Iron; D008070:Lipopolysaccharides; D000099236:Solute Carrier Family 11, Member 2