Attenuation of adverse effects of noise induced hearing loss on adult neurogenesis and memory in rats by intervention with Adenosine A2A receptor agonist

被引:24
|
作者
Shukla, Manish [1 ]
Roy, Koustav [1 ]
Kaur, Charanjeet [2 ]
Nayak, Devasharma [1 ]
Mani, K. V. [1 ]
Shukla, Sangeeta [3 ]
Kapoor, Neeru [1 ]
机构
[1] Def Res & Dev Org, Def Inst Physiol & Allied Sci, Delhi, India
[2] All India Inst Med Sci, Dept Anat, Delhi, India
[3] Jiwaji Univ, Dept Zool, Gwalior, India
关键词
Noise; ABR; Adenosine A(2A); CGS; 21680; Neurogenesis; Memory; SPATIAL REFERENCE MEMORY; HIPPOCAMPAL NEUROGENESIS; SYNAPTIC-TRANSMISSION; A2A RECEPTOR; EXPOSURE; INJURY; ACTIVATION; EXPRESSION; CGS21680; SYSTEM;
D O I
10.1016/j.brainresbull.2019.02.006
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Hearing loss and cognitive decline are commonly associated with aging and morbidity. Present clinical interest lies in whether peripheral hearing loss promotes cognitive decline and if prophylaxis with selective adenosine receptor agonist CGS21680 effectively mitigates the adverse effects. In the current study, male Sprague Dawley rats weighing 200-250 g m were randomly allocated into three groups: Group 1) rats exposed to 100 dB SPL white noise, 2 h a day for 15 consecutive days, 2) rats supplemented with an adenosine receptor agonist, CGS21680 at 100 mu g/kg/day prior to noise exposure and 3) unexposed control rats. Baseline hearing and cognition assessed by auditory brainstem response (ABR) and water maze respectively was undertaken for all the groups. Phalloidin stain and synaptic ribbons count in cochlea, and, Ki67, DCX and NeuN in hippocampus were observed by immunohistochemistry. It was inferred that noise exposed rats showed elevated thresholds of ABR and poorer performances in spatial working memory when compared with controls. On the contrary, CGS21680 administered group exhibited improved ABR and cognitive functions with shorter mean latency and path-length to reach the platform, significant reduction in the noise induced loss of synaptic ribbons count and increased number of Ki67 and doublecortin (DCX) positive cells compared to their noise exposed counterparts. Pharmacologic intervention with selective A(2A) receptor agonist CGS21680 provided adequate protection from noise by effectively maintaining hearing threshold levels, cell viability in cochlea and hippocampus & functional/intact reference memory.
引用
收藏
页码:47 / 57
页数:11
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