Details:

Alternative Title:
J Toxicol Environ Health A
Publisher's site:
http://dx.doi.org/10.1080/15287394.2014.888692
Personal Author:
Popstojanov, Risto ; Antonini, James M. ; Salmen, Rebecca ; Ye, Morgan ; Zheng, Wen ; ... More +
Popstojanov, Risto ; Antonini, James M. ; Salmen, Rebecca ; Ye, Morgan ; Zheng, Wen ; Castranova, Vincent ; Fekedulegn, Desta B. ; Kan, Hong Less -
Description:
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 ([Ca(2+)]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.
Subject:
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Animals Article C-Reactive Protein Calcium Endpoint Determination Enzyme-Linked Immunosorbent Assay Gases Interleukin-6 Isoproterenol Lung Male Models, Animal Myocytes, Cardiac Phosphorylation Rats Rats, Sprague-Dawley Stainless Steel Troponin I Welding
Source:
J Toxicol Environ Health A. 77(12):705-715.
Pubmed ID:
24786677
Pubmed Central ID:
PMC4687892
Document Type:
Journal Article
Funding:
CC999999/Intramural CDC HHS/United States
Collection(s):
CDC Public Access
Main Document Checksum:
[+]
urn:sha256:6a320e570b3fd4cf311be4f9e6245302968bd4dca82c7652e5475f5657eafe71
Download URL:
https://stacks.cdc.gov/view/cdc/37014/cdc_37014_DS1.pdf
File Type:

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