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2015 ; 8
(8
): 13353-8
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Detection of stably expressed piRNAs in human blood
#MMPMID26550265
Yang X
; Cheng Y
; Lu Q
; Wei J
; Yang H
; Gu M
Int J Clin Exp Med
2015[]; 8
(8
): 13353-8
PMID26550265
show ga
BACKGROUND: Circulating microRNAs are potential markers for disease detection. A
novel class of small non-coding RNAs called Piwi-interacting RNAs (piRNAs) has
been recently reported to participate in the epigenetic regulation of cancers and
other diseases. This study aims to discover blood-based piRNAs which can be used
as markers for disease detection and monitoring. MATERIALS AND METHODS: We
selected five piRNAs for detection, namely, has-piR-651, has-piR-823,
has-piR-36707, has-piR-36741 and has-piR-57125. Serum or plasma samples were used
to isolate small RNAs, including the piRNAs. The extracted small RNAs were
reverse-transcribed in the presence of a poly-A polymerase with an oligo-dT
adaptor, and quantitative real-time PCR (qRT-PCR) was applied to measure the
levels of piRNAs. Room-temperature incubation and repetitive freeze-thaw cycles
were performed to measure the stability of the piRNAs. RESULTS: Unlike the four
other piRNAs, has-piR-57125 was present in both the serum and plasma samples.
Regardless of the serum or plasma samples, qRT-PCR analysis indicated that the Ct
values showed no remarkable variation with prolonged incubation time (P > 0.05).
We also detected the Ct values of the samples with repetitive freeze-thaw cycles
and observed a similar trend (P > 0.05) among the samples with diverse
freeze-thaw cycles. CONCLUSION: This study is the first to report that piRNAs are
stably expressed in human serum or plasma samples. Therefore, piRNAs can serve as
valuable blood-based biomarkers for disease detection and monitoring.