American Journal of Otolaryngology - Head and Neck Medicine and Surgery
Volume 32, Issue 1 , Pages 8-12, January 2011

Study of protective effect on rat cochlear spiral ganglion after blast exposure by adenovirus-mediated human β-nerve growth factor gene

  • Jian Wu, MD

      Affiliations

    • Department of Otorhinolaryngology Head and Neck Surgery, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, China
    • Corresponding Author InformationCorresponding author. Department of Otorhinolaryngology Head and Neck Surgery, Shanghai Changzheng Hospital, Second Military Medical University, 415 FengYang Road, Shanghai, 200003 China. Tel.: +86 021 81885962.
    • ,
  • Bing Liu, MD

      Affiliations

    • Department of Otorhinolaryngology Head and Neck Surgery, the Affiliated Hospital of Jining Medical College, Jining, Shangdong Province, China
    • ,
  • Jingping Fan, MD

      Affiliations

    • Department of Otorhinolaryngology Head and Neck Surgery, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, China
    • ,
  • Qiubei Zhu, MD

      Affiliations

    • Department of Otorhinolaryngology Head and Neck Surgery, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, China
    • ,
  • Jiang Wu, MD

      Affiliations

    • Department of Otorhinolaryngology Head and Neck Surgery, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, China

Received 15 June 2009 published online 21 December 2009.

Abstract 

Objective

To study whether adenovirus-mediated human β-nerve growth factor (Ad-hNGFβ) gene has any protective effect on rat cochlear spiral ganglion after blast exposure.

Methods

Deafness was induced by blast exposure (172.0 dB) in 20 healthy rats. Seven days after blast exposure, Ad-hNGFβ was infused into the perilymphatic space of 10 animals as the hNGFβ/blast group, and artificial perilymph fluid (APF) was infused into the perilymphatic space of 10 animals as the APF/blast control group. An additional control group consisted of 10 healthy rats which received Ad-hNGFβ target gene with no blast exposure (hNGFβ/control group). Auditory functions were monitored by thresholds of auditory brain stem responses (ABR). At weeks 1, 4, and 8 postoperatively, the animals were killed, and the cochleae were removed for immunohistochemical, hematoxylin and eosin staining study.

Results

The ABR threshold shifts in the hNGFβ/blast group were significantly smaller than that of APF/blast control group. There were no significant differences of the ABR values between before and after operation in the hNGFβ/control group. Expression of Ad-hNGFβ protein was detected in each turn of the cochlea in the first week, with almost equal intensity in all turns. In the fourth week, the reactive intensity decreased. In the eighth week, no reaction was detectable. The results of hematoxylin and eosin stain showed that the number of spiral ganglions in the hNGFβ/blast group was significantly greater than that of the APF/blast control group in the 4th week (P < .01).

Conclusion

Adenovirus-mediated human β-nerve growth factor can be expressed at a high level and for a relatively long period in the blast impaired cochlea, suggesting that Ad-hNGFβ has a protective effect on rat cochlear spiral ganglion cells after blast exposure.

 

PII: S0196-0709(09)00167-7

doi:10.1016/j.amjoto.2009.08.012

American Journal of Otolaryngology - Head and Neck Medicine and Surgery
Volume 32, Issue 1 , Pages 8-12, January 2011

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