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MicroRNAs Related to Cognitive Impairment After Hearing Loss

Clinical and Experimental Otorhinolaryngology 2021년 14권 1호 p.76 ~ 81
문석균, 채현규, Piao Xian-Yu, 이현진, 김영국, 오승하, 장문영,
소속 상세정보
문석균 ( Mun Seog-Kyun ) - Chung-Ang University College of Medicine Department of Otorhinolaryngology-Head and Neck Surgery
채현규 ( Chae Hyun-Kyu ) - Chung-Ang University College of Medicine Department of Otorhinolaryngology-Head and Neck Surgery
 ( Piao Xian-Yu ) - Chung-Ang University College of Medicine Department of Otorhinolaryngology-Head and Neck Surgery
이현진 ( Lee Hyun-Jin ) - Gyeongsang National University College of Medicine Gyeongsang National University Changwon Hospital Department of Otorhinolaryngology-Head and Neck Surgery
김영국 ( Kim Young-Kook ) - Chonnam National University Medical School Department of Biochemistry
오승하 ( Oh Seung-Ha ) - Seoul National University College of Medicine Department of Otorhinolaryngology-Head and Neck Surgery
장문영 ( Chang Mun-Young ) - Chung-Ang University College of Medicine Department of Otorhinolaryngology-Head and Neck Surgery

Abstract


Objectives: Our research group has previously demonstrated that hearing loss might be a risk factor for synaptic loss within the hippocampus and impairment of cognition using an animal model of Alzheimer disease. In this study, after inducing hearing loss in a rat model of Alzheimer disease, the associations of various microRNAs (miRNAs) with cognitive impairment were investigated.

Methods: Rats were divided randomly into two experimental groups: the control group, which underwent sham surgery and subthreshold amyloid-β infusion and the deaf group, which underwent bilateral cochlear ablation and subthreshold amyloid-β infusion. All rats completed several cognitive function assessments 11 weeks after surgery, including the object-in-place task (OPT), the novel object recognition task (NOR), the object location task (OLT), and the Y-maze test. After the rats completed these tests, hippocampus tissue samples were assessed using miRNA microarrays. Candidate miRNAs were selected based on the results and then validated with quantitative reverse transcription-polymerase chain reaction (qRT-PCR) analyses.

Results: The deaf group showed considerably lower scores on the OPT, OLT, and Y-maze test than the control group. The microarray analysis revealed that miR-29b-3p, -30e-5p, -153-3p, -376a-3p, -598-3p, -652-5p, and -873-3p were candidate miRNAs, and qRT-PCR showed significantly higher levels of miR-376a-3p and miR-598-3p in the deaf group.

Conclusion: These results indicate that miR-376a-3p and miR-598-3p were related to cognitive impairment after hearing loss.

키워드

MicroRNA; Alzheimer Disease; Hearing Loss; Dementia; Hippocampus

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