EPA Science Inventory

Air pollution particles and iron homeostasis

Citation:

Ghio, Andy, J. Soukup, AND L. Dailey. Air pollution particles and iron homeostasis. Biochimica et Biophysica Acta. Elsevier Science Ltd, New York, NY, 1860(12):2816-25, (2016).

Description:

Background: The mechanism underlying biological effects of particles deposited in the lung has not been defined. Major Conclusions: A disruption in iron homeostasis follows exposure of cells to all particulate matter including air pollution particles. Following endocytosis, functional groups at the surface of retained particle complex iron available in the cell. In response to a reduction in concentrations of requisite iron, a functional deficiency can result intracellularly. Superoxide production by the cell exposed to a particle increases ferrireduction which facilitates import of iron with the objective being the reversal of the metal deficiency. Failure to resolve the functional iron deficiency following cell exposure to particles activates kinases and transcription factors resulting in a release of inflammatory mediators and inflammation. Tissue injury is the end product of this disruption in iron homeostasis initiated by the particle exposure. Elevation of available iron to the cell precludes deficiency of the metal and either diminishes or eliminates biological effects.General Significance: Recognition of the pathway for biological effects after particle exposure to involve a functional deficiency of iron suggests novel therapies such as metal supplementation (e.g. inhaled and oral). In addition, the demonstration of a shared mechanism of biological effects allows understanding the common clinical, physiological, and pathological presentation following exposure to disparate particles.

Purpose/Objective:

Demonstration of a shared mechanism of biological effects following exposure to disparate particles allows understanding the common clinical, physiological, and pathological presentation. In addition, recognition of the pathway for biological effects after particle exposure to involve a functional deficiency of iron suggests novel therapies such as metal supplementation (e.g. inhaled and oral).

Record Details:

Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Completion Date: 12/01/2016
Record Last Revised: 12/22/2016
Record Created: 12/22/2016
Record Released: 12/22/2016
OMB Category: Other
Record ID: 334263

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL HEALTH AND ENVIRONMENTAL EFFECTS RESEARCH LABORATORY

ENVIRONMENTAL PUBLIC HEALTH DIVISION

CLINICAL RESEARCH BRANCH