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- W2030044960 abstract "Mechanical ventilation (MV) of the neonatal airway alters mechanical properties and activates tissue-modeling pathways. Heat shock protein (HSP70) is a marker of tissue injury and modulates inflammation, which may influence subsequent pulmonary tissue modeling by matrix metalloproteinases (MMPs). HSP70 secretion is up-regulated in MV airway tissues and associated with changes in airway elasticity and secretion of MMPs. Proximal tracheal segments were isolated in 13 newborn lambs and were either MV for 4 h or SHAM. At baseline and hourly, tracheal segments were flushed and tracheal elasticity was determined. Tracheal wash fluid was assayed for HSP70 by ELISA and for MMPs by substrate zymography. HSP70 secretion increased from baseline to a peak at 1 h in both groups (p < 0.01), greater in the MV group (p < 0.05), and returned to baseline values by 2 h. This response was in contrast to the progressive decrease in tracheal elasticity (p < 0.05). The HSP70 elevation pattern was noted in MMP-2, but beyond 1 h, MMP-2 returned to baseline values in MV group but remained elevated in SHAM (p < 0.05). HSP70 secretion is associated with the degree of biophysical tracheal injury as well as the time course of MMP-2 secretion by tracheal tissues." @default.
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- W2030044960 date "2009-04-01" @default.
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- W2030044960 title "Heat Shock Protein 70 Secretion by Neonatal Tracheal Tissue During Mechanical Ventilation: Association With Indices of Tissue Function and Modeling" @default.
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- W2030044960 doi "https://doi.org/10.1203/pdr.0b013e31819913f5" @default.
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