Fluorescence-based codetection with protein markers reveals distinct cellular compartments for altered MicroRNA expression in solid tumors.
OBJECTIVE
High-throughput profiling experiments have linked altered expression of microRNAs (miRNA) to different types of cancer. Tumor tissues are a heterogeneous mixture of not only cancer cells, but also supportive and reactive tumor microenvironment elements. To clarify the clinical significance of altered miRNA expression in solid tumors, we developed a sensitive fluorescence-based in situ hybridization (ISH) method to visualize miRNA accumulation within individual cells in formalin-fixed, paraffin-embedded tissue specimens. This ISH method was implemented to be compatible with routine clinical immunohistochemical (IHC) assays to enable the detection of miRNAs and protein markers in the same tissue section for colocalization and functional studies.


METHODS
We used this combined ISH/IHC assay to study a subset of cancer-associated miRNAs, including miRNAs frequently detected at low (miR-34a and miR-126) and high (miR-21 and miR-155) levels, in a panel of breast, colorectal, lung, pancreas, and prostate carcinomas.


RESULTS
Despite the distinct histopathologic alterations of each particular cancer type, general trends emerged that pinpointed distinct source cells of altered miRNA expression. Although altered expressions of miR-21 and miR-34a were manifested within cancer cells, those of miR-126 and miR-155 were predominantly confined to endothelial cells and immune cells, respectively. These results suggest a heterogeneous participation of miRNAs in carcinogenesis by intrinsically affecting cancer cell biology or by modulating stromal, vascular, and immune responses.


CONCLUSIONS
We described a rapid and sensitive multicolor ISH/IHC assay and showed that it could be broadly applied as an investigational tool to better understand the etiologic relevance of altered miRNA expression in cancer.
Sempere
Lorenzo F
LF
Department of Medicine, Dartmouth Hitchcock Medical Center, Lebanon, NH, USA. Lorenzo.F.Sempere@Dartmouth.edu
Preis
Meir
M
Yezefski
Todd
T
Ouyang
Haoxu
H
Suriawinata
Arief A
AA
Silahtaroglu
Asli
A
Conejo-Garcia
Jose R
JR
Kauppinen
Sakari
S
Wells
Wendy
W
Korc
Murray
M
D014408:Biomarkers, Tumor / Q000032:analysis*; D005260:Female; D006801:Humans; D007090:Image Interpretation, Computer-Assisted; D007150:Immunohistochemistry / Q000379:methods*; D017404:In Situ Hybridization, Fluorescence / Q000379:methods*; D008297:Male; D035683:MicroRNAs / Q000302:isolation & purification*; D009369:Neoplasms / Q000235:genetics*; D016612:Paraffin Embedding; D015203:Reproducibility of Results
D014408:Biomarkers, Tumor; D035683:MicroRNAs