Abstract |
MicroRNA-206, which suppresses the expression of brain-derived neurotrophic factor, is known to be elevated in the brains of Alzheimer's disease (AD) patients. We performed intranasal biopsy of the olfactory epithelia of early dementia patients (n = 24) and cognitively healthy controls (n = 9). Patients with significant depression (n = 8) were analyzed separately, as their cognitive impairments were thought to be caused by their depression. Real-time PCR was performed on the biopsied tissues. The relative microRNA-206 level exhibited a 7.8-fold increase (P = 0.004) in the mild cognitive impairment group (CDR 0.5; n = 13) and a 41.5-fold increase (P < 0.001) in the CDR 1 group (n = 11). However, this level was not increased in the depression group, even in those with cognitive decline. Using the optimal cutoff value, the sensitivity/specificity for diagnosing CDR 0.5 and CDR 1 dementia were 87.5%/94.1% and 90.9%/93.3%, respectively. In ROC analysis, the AUCs were 0.942 and 0.976 in the CDR 0.5 and CDR 1 groups, respectively. The olfactory mucosal microRNA-206 level and cognitive assessment scores were significantly correlated in the non-depressed subjects with cognitive impairment. In conclusion, the olfactory mucosal microRNA-206 level can be easily measured, and it can be utilized as an excellent biomarker for the diagnosis of early AD, including mild cognitive impairment.
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Authors | Jangsup Moon, Soon-Tae Lee, Il Gyu Kong, Jung-Ick Byun, Jun-Sang Sunwoo, Jung-Won Shin, Ji-Young Shim, Ji-Hyun Park, Daejong Jeon, Keun-Hwa Jung, Ki-Young Jung, Dong-Young Kim, Sang Kun Lee, Manho Kim, Kon Chu |
Journal | Scientific reports
(Sci Rep)
Vol. 6
Pg. 20364
(Feb 04 2016)
ISSN: 2045-2322 [Electronic] England |
PMID | 26842588
(Publication Type: Journal Article)
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Chemical References |
- Biomarkers
- MIRN206 microRNA, human
- MicroRNAs
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Topics |
- Aged
- Aged, 80 and over
- Alzheimer Disease
(diagnosis, genetics, metabolism)
- Area Under Curve
- Biomarkers
(metabolism)
- Case-Control Studies
- Cognition Disorders
(complications)
- Early Diagnosis
- Female
- Humans
- Male
- MicroRNAs
(metabolism)
- Middle Aged
- Olfactory Mucosa
(metabolism, pathology)
- ROC Curve
- Real-Time Polymerase Chain Reaction
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