MicroRNAs miR-144/144 and miR-16 in peripheral blood are potential biomarkers for naturalistic stress in healthy Japanese medical students

► Naturalistic stressor-responsive miRNAs in blood were analyzed by a miRNA array. ► Healthy medical students taking an academic examination were subjected to this study. ► Microarray analysis extracted 11 candidate miRNAs responsive to the stressor. ► Real-time RT-PCR identified miR-144/144* and mi...

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Bibliographic Details
Published in:Neuroscience letters 2012-05, Vol.516 (1), p.79-84
Main Authors: Katsuura, Sakurako, Kuwano, Yuki, Yamagishi, Naoko, Kurokawa, Ken, Kajita, Keisuke, Akaike, Yoko, Nishida, Kensei, Masuda, Kiyoshi, Tanahashi, Toshihito, Rokutan, Kazuhito
Format: Article
Language:English
Subjects:
Anxiety
biomarkers
Biomarkers - blood
DNA microarrays
Environmental changes
Examination stress
Female
gamma -Interferon
Humans
Hydrocortisone
Interferon-gamma - blood
Interferon-gamma - genetics
Japan - epidemiology
Male
Medical personnel
MicroRNAs - blood
miRNA
Nervous system
Peripheral blood
Polymerase chain reaction
Prevalence
Proinflammatory cytokine
Reverse transcription
Saliva
Stress
Stress, Psychological - blood
Stress, Psychological - epidemiology
Students, Medical - statistics & numerical data
Tumor necrosis factor- alpha
Tumor Necrosis Factor-alpha - blood
Tumor Necrosis Factor-alpha - genetics
Young Adult
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Summary:► Naturalistic stressor-responsive miRNAs in blood were analyzed by a miRNA array. ► Healthy medical students taking an academic examination were subjected to this study. ► Microarray analysis extracted 11 candidate miRNAs responsive to the stressor. ► Real-time RT-PCR identified miR-144/144* and miR-16 as stress-responsive miRNAs. ► Changes in miR-144* and miR-16 levels were associated with TNF-α and IFN-γ responses. Non-coding microRNAs (miRNAs) are suggested to serve fundamental roles in cellular stress responses and in coping with sudden environmental changes in experimental animals. We examined whether naturalistic stressor-responsive miRNAs were detectable in whole blood. Blood and saliva were collected between 16:00 and 17:00 from 10 healthy medical students (5 males and 5 females; aged 22.4±0.8 years, mean±SD) 7 weeks before, one day before, immediately after, and one week after a nationally administered examination for academic promotion. Samples obtained one week after the examination were used as baseline controls. State anxiety and salivary cortisol levels reached maximum levels the day before the examination. Eleven candidate miRNAs (miR-144, -144*, -16, -15a, -19a, -19b, -26b, -30b, -106b, -126, and -142-3p) were extracted using a human miRNA microarray, and quantitative real-time reverse transcription PCR confirmed significant elevation of miR-144/144* and miR-16 levels immediately after finishing the examination. miR-16 levels in individual students were positively correlated with those of serum tumor necrosis factor (TNF)-α measured immediately after the examination. Percentage changes in miR-144* and miR-16 levels from immediately after to one week after the examination were significantly correlated with percentage changes in circulating interferon-γ and/or TNF-α levels over the same time points. Our results suggest that miR-144/144* and miR-16 may constitute a part of an integrated response to naturalistic stressors in healthy young adults.
ISSN:0304-3940
1872-7972
DOI:10.1016/j.neulet.2012.03.062