Published Online
on February 7, 2008

A more recent version of this article appeared on March 1, 2008

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Submitted on July 31, 2007
Revised on August 9, 2007
Accepted on August 15, 2007

MicroRNA Expression in the Blood and Brain of Rats Subjected to Transient Focal Ischemia by Middle Cerebral Artery Occlusion

Kandiah Jeyaseelan PhD^*; Kai Ying Lim BSc; and Arunmozhiarasi Armugam PhD

From the Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.

^* To whom correspondence should be addressed. E-mail: bchjeya{at}nus.edu.sg.

Background and Purpose—Several hundred small RNAs called microRNAs (miRNAs) have been identified and characterized from various organisms, including humans. In humans, some of these miRNAs have been found to regulate (patho)physiologic conditions such as tumor progression/regression, cholesterol and glucose homeostasis, etc. In this report, we present data on the miRNAs expressed under ischemic conditions in both the brain and blood of rats subjected to middle cerebral artery occlusion (MCAo).

Methods—Sprague-Dawley rats subjected to MCAo were reperfused for either 24 or 48 hours, and both blood and brain samples were harvested. miRNA expression profiling and oligonucleotide microarray were carried out, and the data were validated by quantitative real-time polymerase chain reaction and correlated with published data on protein and gene expression in MCAo rats.

Results—We report here for the first time the involvement of miRNA regulation in brain pathogenesis associated with MCAo. Comparison with the corresponding DNA microarray data revealed that the target mRNA expression is correlated with the regulation of miRNA. We have also provided evidence that some of the miRNAs that are highly expressed in the ischemic brain can be detected in blood samples.

Conclusions—Further studies are needed to evaluate the possible use of miRNAs as biomarkers in stroke and related pathologies.

Key words: ischemia • middle cerebral artery occlusion • microRNA • profiling • Sprague-Dawley rats

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