Detail
| Localization |
Tissue |
Validated Method |
PMID |
| Exosome |
A549|HepG2 |
Microarrays|RT-PCR |
20615901 |
|
Description: These observations of miRNA distribution demonstrate that the miRNA export system in the cells must somehow be able to target specific miRNAs to specific extracellular structures, but does not exclusively channel specific miRNAs to a given fraction. There are, however, some miRNAs that are found in the supernatant almost to the exclusion of all other fractions (miR-219 in A549 culture medium, Figure 4b, for example). Another significant observation from this data is that even though we showed that the two cell lines studied here export a similar spectrum of miRNAs (Figure 1b) the distributions of miRNAs from the two cell lines demonstrate clear differences, as shown in Figure 4b and c. For example, miR-145 is present at very low levels in HepG2 derived microvesicles (Figure 4c), while the same miRNA is present at significant levels in both A549 derived microvesicles and exosomes (Figure 4b). On the other hand, there are some miRNAs, notably those that are almost uniformly distributed among the fractions, with the same distribution no matter which cell-line is the source. These observations certainly indicate the degree of complexity of this export system that will bear further investigation. Data are collected from Figure 4.
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Other Subcellular Localization: