Medline ® Abstracts for References 43,44

of 'Reactive airways dysfunction syndrome and irritant-induced asthma'

43
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AEOL10150: a novel therapeutic for rescue treatment after toxic gas lung injury.
AU
McGovern T, Day BJ, White CW, Powell WS, Martin JG
SO
Free Radic Biol Med. 2011 Mar;50(5):602-8. Epub 2010 Dec 13.
 
New therapeutics designed as rescue treatments after toxic gas injury such as from chlorine (Cl(2)) are an emerging area of interest. We tested the effects of the metalloporphyrin catalytic antioxidant AEOL10150, a compound that scavenges peroxynitrite, inhibits lipid peroxidation, and has SOD and catalase-like activities, on Cl(2)-induced airway injury. Balb/C mice received 100ppm Cl(2) gas for 5 min. Four groups were studied: Cl(2) only, Cl(2) followed by AEOL10150 1 and 9 h after exposure, AEOL10150 only, and control. Twenty-four hours after Cl(2) gas exposure airway responsiveness to aerosolized methacholine (6.25-50mg/ml) was measured using a small-animal ventilator. Bronchoalveolar lavage (BAL) was performed to assess airway inflammation and protein. Whole lung tissue was assayed for 4-hydroxynonenal. In separate groups, lungs were collected at 72 h after Cl(2) injury to evaluate epithelial cell proliferation. Mice exposed to Cl(2) showed a significantly higher airway resistance compared to control, Cl(2)/AEOL10150, or AEOL10150-only treated animals in response to methacholine challenge. Eosinophils, neutrophils, and macrophages were elevated in BAL of Cl(2)-exposed mice. AEOL10150 attenuated the increases in neutrophils and macrophages. AEOL10150 prevented Cl(2)-induced increase in BAL fluid protein. Chlorine induced an increase in the number of proliferating airwayepithelial cells, an effect AEOL10150 attenuated. 4-Hydroxynonenal levels in the lung were increased after Cl(2) and this effect was prevented with AEOL10150. AEOL10150 is an effective rescue treatment for Cl(2)-induced airway hyperresponsiveness, airway inflammation, injury-induced airway epithelial cell regeneration, and oxidative stress.
AD
Meakins Christie Laboratories, Department of Medicine, McGill University, Montreal, QC H2X 2P2, Canada.
PMID
44
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Persistent respiratory health effects after a metam sodium pesticide spill.
AU
Cone JE, Wugofski L, Balmes JR, Das R, Bowler R, Alexeeff G, Shusterman D
SO
Chest. 1994;106(2):500.
 
STUDY OBJECTIVE: To report the occurrence of persistent respiratory disorders, including irritant-induced asthma, among adults living and working near an environmental spill of the pesticide, metam sodium, after the derailment of a tank car.
DESIGN: Retrospective clinical case series.
SETTING: California communities situated within one-half mile of the Sacramento River, from Mt. Shasta City to Shasta Lake.
PATIENTS: 197 adults referred to a university occupational/environmental health clinic or to a private occupational/environmental health practitioner for evaluation of health problems potentially related to the spill.
MEASUREMENTS AND RESULTS: History, physical examination, review of medical records, spirometry, and methacholine challenge testing revealed 20 cases of persistent irritant-induced asthma and 10 cases of persistent exacerbation of asthma.
CONCLUSIONS: This is the first reported series of cases of persistent irritant-induced asthma involving both community residents and occupationally exposed individuals.
AD
Department of Medicine, University of California, San Francisco, USA.
PMID