Puerarin alleviates noise-induced hearing loss via affecting PKCγ and GABAB receptor expression
Autor: | Zhen-Zhen Kou, Jing Huang, Ming Shi, Juan Qu, Jing Chen, Shengxi Wu, Yong-Hui Liao, Yun-Qing Li, Yuchio Yanagawa, Yan-Yan Wei |
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Rok vydání: | 2015 |
Předmět: |
Genetically modified mouse
medicine.medical_specialty Pueraria Vasodilator Agents Transgene Blotting Western Gene Expression GABAB receptor Real-Time Polymerase Chain Reaction Mice chemistry.chemical_compound Puerarin Internal medicine Glial Fibrillary Acidic Protein Evoked Potentials Auditory Brain Stem otorhinolaryngologic diseases medicine Animals RNA Messenger Protein Kinase C Protein kinase C Mice Knockout Neurons biology Glutamate Decarboxylase Chemistry biology.organism_classification medicine.disease Isoflavones Peptide Fragments Mice Inbred C57BL Disease Models Animal Microscopy Electron Endocrinology Auditory brainstem response Hearing Loss Noise-Induced Microscopy Fluorescence Receptors GABA-B Neurology Neurology (clinical) Neuroscience Noise-induced hearing loss |
Zdroj: | Journal of the Neurological Sciences. 349:110-116 |
ISSN: | 0022-510X |
Popis: | Noise-induced hearing loss (NIHL) often results from prolonged exposure to high levels of noise. Our previous study revealed that during the development of NIHL, the expression of protein kinase C γ subunit (PKCγ) and GABAB receptor (GABABR) was changed within the cochlear nuclear complex (CNC), suggesting that these molecules might be the potential targets for the treatment of NIHL. As an extending study, here we focused on puerarin, a major isoflavonoid extracted from Pueraria lobota, which has been used in the treatment of cardiovascular and cerebrovascular diseases, and investigated whether it could protect against NIHL by acting on PKCγ and GABABR. Transgenic GAD67-GFP knock-in mice were subjected to the NIHL model and their auditory functions were evaluated by the auditory brainstem response thresholds and distortion product oto-acoustic emission signals. Our results showed that 200mg/kg puerarin treatment ameliorated the thresholds of auditory brainstem response of NIHL mice significantly. Triple immunofluorescence staining and electron microscopy results revealed that GFP-positive neurons in the superficial layers of CNC expressed both PKCγ and GABABR1, and GAD67-positive terminals contacted PKCγ- or GABABR1-positive neurons. Immunoblotting and RT-PCR results showed that NIHL increased the expression of PKCγ but decreased that of GABABR1 and GABABR2 at both protein and mRNA levels in the CNC. Puerarin significantly attenuated the increased expression of PKCγ but elevated the reduced expression of GABABR1 and GABABR2 after noise exposure. Thus, we provided the first evidence that puerarin ameliorated the auditory functions of NIHL mice, and this effect may be due to its ability to regulate the expression of PKCγ and GABABR. |
Databáze: | OpenAIRE |
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