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Gene expression of transforming growth factor-β1 and hepatocyte growth factor during wound healing of injured rat vocal fold

Authors

  • Tsunehisa Ohno MD,

    1. Department of Otolaryngology, Vanderbilt University Bill Wilkerson Center for Otolaryngology and Communication Sciences, Nashville, Tennessee, U.S.A.
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  • Shigeru Hirano MD, PhD,

    1. Department of Otolaryngology–Head and Neck Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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  • Bernard Rousseau PhD

    Corresponding author
    1. Department of Otolaryngology, Vanderbilt University Bill Wilkerson Center for Otolaryngology and Communication Sciences, Nashville, Tennessee, U.S.A.
    • Vanderbilt University, Department of Otolaryngology, 1313 21st Avenue South, Room 602, Nashville, TN 37232-4480
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  • This research was supported by the Department of Otolaryngology, Vanderbilt University Medical Center.

  • This study was performed in accordance with the Public Health Service Policy on Humane Care and Use of Laboratory Animals, the National Institutes of Health Guide for the Care and Use of Laboratory Animals, and the Animal Welfare Act (7 U.S.C. et seq.); the animal use protocol was approved by the institutional animal care and use committee of Vanderbilt University Medical Center.

Abstract

Objectives/Hypothesis:

To investigate the expression of genes coding transforming growth factor (TGF)-β1, hepatocyte growth factor (HGF), and c-Met, its membrane-spanning tyrosine kinase receptor, during the inflammatory, proliferative, and remodeling phases of wound healing in the injured rat vocal fold.

Study Design:

Prospective animal study.

Methods:

Thirty five rats were involved in this study. Bilateral vocal fold wounds were created in 30 rats. Injured vocal fold specimens were harvested on postinjury day 1, 3, 7, 14, 28, and 56. Real-time polymerase chain reaction (PCR) was used to quantify mRNA expression of TGF-β1, HGF, and c-Met. Five uninjured rats were used to establish PCR control.

Results:

Results of analysis of variance revealed a significant main effect for TGF-β1 (P = .000), HGF (P = .000), and c-Met (P = .000) expression across time points. Post-hoc testing revealed that TGF-β1 expression increased significantly on postinjury day 7 (P = .001) compared to control. HGF expression decreased significantly on postinjury day 1 (P = .001), and increased significantly on postinjury day 14 (P = .000). c-Met expression decreased significantly on postinjury day 1 (P = .000), day 3 (P = .000), and day 56 (P = .000), and increased significantly on postinjury day 28 (P = .000).

Conclusions:

Results revealed time-dependent changes in the regulation of genes coding TGF-β1, HGF, and c-Met during wound healing in the injured rat vocal fold. These patterns of gene expression correspond well with previously reported histologic changes of the rat vocal fold after injury. Laryngoscope, 2009

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