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01.12.2012 | Research | Ausgabe 1/2012 Open Access

Molecular Cancer 1/2012

Microparticle conferred microRNA profiles - implications in the transfer and dominance of cancer traits

Zeitschrift:
Molecular Cancer > Ausgabe 1/2012
Autoren:
Ritu Jaiswal, Frederick Luk, Joyce Gong, Jean-Marie Mathys, Georges Emile Raymond Grau, Mary Bebawy
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​1476-4598-11-37) contains supplementary material, which is available to authorized users.

Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

RJ conducted all experiments and drafted the manuscript; FL participated in manuscript preparation including microarray and RT-PCR data analysis; JG participated in microarray breast cancer sample preparation; J-MM participated in the design of the microarray study and provided reagents; MB, GERG participated in work planning and manuscript preparation. All authors read and approved the final manuscript.

Abstract

Background

Microparticles (MPs) are membrane vesicles which are released from normal and malignant cells following a process of budding and detachment from donor cells. MPs contain surface antigens, proteins and genetic material and serve as vectors of intercellular communication. MPs comprise the major source of systemic RNA including microRNA (miRNA), the aberrant expression of which appears to be associated with stage, progression and spread of many cancers. Our previous study showed that MPs carry both transcripts and miRNAs associated with the acquisition of multidrug resistance in cancer.

Results

Herein, we expand on our previous finding and demonstrate that MPs carry the transcripts of the membrane vesiculation machinery (floppase and scramblase) as well as nucleic acids encoding the enzymes essential for microRNA biogenesis (Drosha, Dicer and Argonaute). We also demonstrate using microarray miRNA profiling analysis, the selective packaging of miRNAs (miR-1228*, miR-1246, miR-1308, miR-149*, miR-455-3p, miR-638 and miR-923) within the MP cargo upon release from the donor cells.

Conclusions

These miRNAs are present in both haematological and non-haematological cancer cells and are involved in pathways implicated in cancer pathogenesis, membrane vesiculation and cascades regulated by ABC transporters. Our recent findings reinforce our earlier reports that MP transfer ‘re-templates’ recipient cells so as to reflect donor cell traits. We now demonstrate that this process is likely to occur via a process of selective packaging of nucleic acid species, including regulatory nucleic acids upon MP vesiculation. These findings have significant implications in understanding the cellular basis governing the intercellular acquisition and dominance of deleterious traits in cancers.
Zusatzmaterial
Authors’ original file for figure 1
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Authors’ original file for figure 10
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Literatur
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