Identification of serum microRNA signatures for diagnosis of mild traumatic brain injury in a closed head injury model.
Wars in Iraq and Afghanistan have highlighted the problems of diagnosis and treatment of mild traumatic brain injury (mTBI). MTBI is a heterogeneous injury that may lead to the development of neurological and behavioral disorders. In the absence of specific diagnostic markers, mTBI is often unnoticed or misdiagnosed. In this study, mice were induced with increasing levels of mTBI and microRNA (miRNA) changes in the serum were determined. MTBI was induced by varying weight and fall height of the impactor rod resulting in four different severity grades of the mTBI. Injuries were characterized as mild by assessing with the neurobehavioral severity scale-revised (NSS-R) at day 1 post injury. Open field locomotion and acoustic startle response showed behavioral and sensory motor deficits in 3 of the 4 injury groups at day 1 post injury. All of the animals recovered after day 1 with no significant neurobehavioral alteration by day 30 post injury. Serum microRNA (miRNA) profiles clearly differentiated injured from uninjured animals. Overall, the number of miRNAs that were significantly modulated in injured animals over the sham controls increased with the severity of the injury. Thirteen miRNAs were found to identify mTBI regardless of its severity within the mild spectrum of injury. Bioinformatics analyses revealed that the more severe brain injuries were associated with a greater number of miRNAs involved in brain related functions. The evaluation of serum miRNA may help to identify the severity of brain injury and the risk of developing adverse effects after TBI.
Department of Pathology, Uniformed Services University of the Health Sciences, Bethesda, Maryland, United States of America.
Anuj
A
Sharma
Department of Pathology, Uniformed Services University of the Health Sciences, Bethesda, Maryland, United States of America; Biological Sciences Group, Birla Institute of Technology and Science, Pilani, Rajasthan, India.
Raghavendar
R
Chandran
Department of Medical and Clinical Psychology, Uniformed Services University of the Health Sciences, Bethesda, Maryland, United States of America.
Erin S
ES
Barry
Department of Pathology, Uniformed Services University of the Health Sciences, Bethesda, Maryland, United States of America.
Manish
M
Bhomia
Department of Medical and Clinical Psychology, Uniformed Services University of the Health Sciences, Bethesda, Maryland, United States of America.
Mary Anne
MA
Hutchison
Department of Pathology, Uniformed Services University of the Health Sciences, Bethesda, Maryland, United States of America.
Nagaraja S
NS
Balakathiresan
Department of Medical and Clinical Psychology, Uniformed Services University of the Health Sciences, Bethesda, Maryland, United States of America.
Neil E
NE
Grunberg
Department of Pathology, Uniformed Services University of the Health Sciences, Bethesda, Maryland, United States of America.
Radha K
RK
Maheshwari
D000818:Animals; D001522:Behavior, Animal; D001921:Brain / Q000503:physiopathology; D001930:Brain Injuries / Q000097:blood* / Q000150:complications / Q000175:diagnosis* / Q000235:genetics; D019295:Computational Biology; D020869:Gene Expression Profiling; D016489:Head Injuries, Closed / Q000150:complications*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D035683:MicroRNAs / Q000097:blood* / Q000235:genetics*; D013216:Reflex, Startle
D035683:MicroRNAs