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Alterations in cardiomyocyte function after pulmonary treatment with stainless steel welding fume in rats.

Authors
Popstojanov-R; Antonini-JM; Salmen-R; Ye-M; Zheng-W; Castranova-V; Fekedulegn-DB; Kan-H
Source
J Toxicol Environ Health, A 2014 May; 77(12):705-715
NIOSHTIC No.
20044220
Abstract
Welding fume is composed of a complex of different metal particulates. Pulmonary exposure to different welding fumes may exert a negative impact on cardiac function, although the underlying mechanisms remain unclear. To explore the effect of welding fumes on cardiac function, Sprague-Dawley rats were exposed by intratracheal instillation to 2 mg/rat of manual metal arc hard surfacing welding fume (MMA-HS) once per week for 7 wk. Control rats received saline. Cardiomyocytes were isolated enzymatically at d 1 and 7 postexposure. Intracellular calcium ([Ca2+]i) transients (fluorescence ratio) were measured on the stage of an inverted phase-contrast microscope using a myocyte calcium imaging/cell length system. Phosphorylation levels of cardiac troponin I (cTnI) were determined by Western blot. The levels of nonspecific inflammatory marker C-reactive protein (CRP) and proinflammatory cytokine interleukin-6 (IL-6) in serum were measured by enzyme-linked immunosorbent assay (ELISA). Contraction of isolated cardiomyocytes was significantly reduced at d 1 and d 7 postexposure. Intracellular calcium levels were decreased in response to extracellular calcium stimulation at d 7 postexposure. Changes of intracellular calcium levels after isoprenaline hydrochloride (ISO) stimulation were not markedly different between groups at either time point. Phosphorylation levels of cTnI in the left ventricle were significantly lower at d 1 postexposure. The serum levels of CRP were not markedly different between groups at either time point. Serum levels of IL-6 were not detectable in both groups. Cardiomyocyte alterations observed after welding fume treatment were mainly due to alterations in intracellular calcium handling and phosphorylation levels of cTnI.
Keywords
Welding; Fumes; Metal-fumes; Metallic-compounds; Metallic-fumes; Pulmonary-function; Pulmonary-system; Pulmonary-system-disorders; Exposure-levels; Risk-factors; Cardiac-function; Animals; Laboratory-animals
Contact
Risto Popstojanov, Health Effects Laboratory Division (HELD), National Institute for Occupational Safety and Health, 1095 Willowdale Road, Morgantown, WV 26505
CODEN
JTEHD6
Publication Date
20140501
Document Type
Journal Article
Email Address
popstojanov@yahoo.com
Fiscal Year
2014
NTIS Accession No.
NTIS Price
Identifying No.
M052014
Issue of Publication
12
ISSN
1528-7394
NIOSH Division
HELD
Priority Area
Construction
Source Name
Journal of Toxicology and Environmental Health, Part A: Current Issues
State
WV; CA
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