Key result
Cyclic mechanical strain reduces SM22, smMHC, and SRF-dependent promoter activity by ~65% in canine tracheal myocytes.
Why the study?
Mechanical strain modulates airway myocyte phenotype and function, but its effects on smooth muscle-specific gene transcription and the underlying signaling mechanisms were unclear.
Population
Primary cultured canine tracheal myocytes transiently transfected with smooth muscle gene promoters
Comparison
Cyclic strain for 48 h or strain-independent PKC activation versus unstrained or untreated cells
Design
Preclinical experimental study with luciferase reporter assays
Follow-up
48 h
Authors
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May modulate airway myocyte phenotype; leaves open relevance to human asthma remodeling.
Mechanical strain inhibits smooth muscle-specific gene transcription in airway myocytes through a PKC-dependent mechanism that alters actin cytoskeletal dynamics.
Wang et al. (2004) studied this question. Cyclic mechanical strain vs. Unstrained (implied) was evaluated on Transcriptional activity of SM22, smMHC, and SRF-dependent promoters. Cyclic mechanical strain for 48 hours significantly reduced transcriptional activity of SM22, smMHC, and SRF-dependent promoters in canine tracheal myocytes by 55-75%.
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