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Fabrisia A, Elke B, Donna S, Ricardo F, Bret G, Bridget D, Giovanna D, Alexandra R, Amin C, Yesica G, Aaron B. Arsenic induces sustained impairment of skeletal muscle and muscle progenitor cell ultrastructure and bioenergetics. Free Radic Biol Med 2014; 74:64-73. [PMID: 24960579 PMCID: PMC4159748 DOI: 10.1016/j.freeradbiomed.2014.06.012] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Revised: 05/20/2014] [Accepted: 06/17/2014] [Indexed: 02/07/2023]
Abstract
Over 4 million individuals in the United States, and over 140 million individuals worldwide, are exposed daily to arsenic-contaminated drinking water. Human exposures can range from below the current limit of 10 μg/L to over 1mg/L, with 100 μg/L promoting disease in a large portion of those exposed. Although increased attention has recently been paid to myopathy following arsenic exposure, the pathogenic mechanisms underlying clinical symptoms remain poorly understood. This study tested the hypothesis that arsenic induces lasting muscle mitochondrial dysfunction and impairs metabolism. Compared to nonexposed controls, mice exposed to drinking water containing 100 μg/L arsenite for 5 weeks demonstrated impaired muscle function, mitochondrial myopathy, and altered oxygen consumption that were concomitant with increased mitochondrial fusion gene transcription. There were no differences in the levels of inorganic arsenic or its monomethyl and dimethyl metabolites between controls and exposed muscles, confirming that arsenic does not accumulate in muscle. Nevertheless, muscle progenitor cells isolated from exposed mice recapitulated the aberrant myofiber phenotype and were more resistant to oxidative stress, generated more reactive oxygen species, and displayed autophagic mitochondrial morphology, compared to cells isolated from nonexposed mice. These pathological changes from a possible maladaptive oxidative stress response provide insight into declines in muscle functioning caused by exposure to this common environmental contaminant.
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Affiliation(s)
- Ambrosio Fabrisia
- Department of Physical Medicine & Rehabilitation,
University of Pittsburgh, Pittsburgh, PA 15219
| | - Brown Elke
- Department of Physical Medicine & Rehabilitation,
University of Pittsburgh, Pittsburgh, PA 15219,
| | - Stolz Donna
- Department of Cell Biology, University of Pittsburgh, Pittsburgh,
PA 15213,
| | - Ferrari Ricardo
- Department of Physical Medicine & Rehabilitation,
University of Pittsburgh, Pittsburgh, PA,
| | - Goodpaster Bret
- Department of Medicine, University of Pittsburgh, Pittsburgh, PA
15213,
| | - Deasy Bridget
- Department of Orthopaedic Surgery, University of Pittsburgh,
Pittsburgh, PA 15213,
| | - Distefano Giovanna
- Department of Physical Therapy, University of Pittsburgh,
Pittsburgh, PA, 15213,
| | - Roperti Alexandra
- Department of Bioengineering, University of Pittsburgh, Pittsburgh,
PA, 15213,
| | - Cheikhi Amin
- Department of Environmental and Occupational Health, University of
Pittsburgh, Pittsburgh, PA, 15219,
| | - Garciafigueroa Yesica
- Department of Environmental and Occupational Health, University of
Pittsburgh, Pittsburgh, PA, 15219,
| | - Barchowsky Aaron
- Department of Environmental and Occupational Health, University of
Pittsburgh, Pittsburgh, PA, 15219,
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Boulnois JL, Bret G, Cottin P, Van Lerberghe A, Agrawal GP. Gas-flow-induced controlled unidirectional operation of a CO(2) ring laser. Opt Lett 1985; 10:7-9. [PMID: 19724328 DOI: 10.1364/ol.10.000007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
It is shown experimentally and theoretically that axial gas flow leads to controlled unidirectional operation of a CO(2) ring laser. The direction of emission, clockwise or counterclockwise, can be selected by a slight tuning of the laser cavity (~1% of the free spectral range). The flow velocity required for complete mode extinction depends on the relative magnitudes of the Doppler and homogeneous line widths and is ~10 m/sec when the two are comparable.
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