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Carbon Monoxide Rapidly Impairs Alveolar Fluid Clearance by Inhibiting Epithelial Sodium Channels
(2009)
Carbon monoxide (CO) is currently being evaluated as a therapeutic modality in the treatment of patients with acute lung injury and acute respiratory distress syndrome. No study has assessed the effects of CO on transepithelial ion transport and alveolar fluid reabsorption, two key aspects of alveolocapillary barrier function that are perturbed in acute lung injury/acute respiratory distress syndrome. Both CO gas (250 ppm) and CO donated by the CO donor, CO-releasing molecule (CORM)-3 (100 mu M in epithelial lining fluid), applied to healthy, isolated, ventilated, and perfused rabbit lungs, significantly blocked Na-22(+) clearance from the alveolar compartment, and blocked alveolar fluid reabsorption after fluid challenge. Apical application of two CO donors, CORM-3 or CORM-A1 (100 mu M), irreversibly inhibited amiloride-sensitive short-circuit currents in H441 human bronchiolar epithelial cells and primary rat alveolar type II cells by up to 40%. Using a nystatin permabilization approach, the CO effect was localized to amiloride-sensitive channels on the apical surface. This effect was abolished by hemoglobin, a scavenger of CO, and was not observed when inactive forms of CO donors were employed. The effects of CO were not blocked by 8-bromoguanosine-3',5'-cyclic guanosine monophosphate, soluble guanylate cyclase inhibitors (methylene blue and 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one), or inhibitors of trafficking events (phalloidin oleate, MG-132, and brefeldin A), but the amiloride affinity of H441 cells was reduced after CO exposure. These data indicate that CO rapidly inhibits sodium absorption across the airway epithelium by cyclic guanosine monophosphate-and trafficking-independent mechanisms, which may rely on critical histidine residues in amiloride-sensitive channels or associated regulatory proteins on the apical surface of lung epithelial cells.
Mechanical properties and microstructure of heavy aluminum bonding wires for power applications
(2009)
The invention relates to compounds that include peptide and peptidomimetics that inhibit estrogen receptor dependent cell proliferation. The compounds of the invention are useful for treating cell proliferative disorders or physiological conditions characterized by undesirable or unwanted estrogen induced cell proliferation, including breast cancer.
Kompendium Q-M-A
(2009)
The nutrient element calcium
(2009)