The GW182 RNA-binding protein was initially shown to associate with a specific subset of mRNAs and to reside within discrete cytoplasmic foci named GW bodies (GWBs). GWBs are enriched in proteins that are involved in mRNA degradation. Recent reports have shown that exogenously introduced human Argonaute-2 (Ago2) is also enriched in GWBs, indicating that RNA interference function may be somehow linked to these structures. In this report, we demonstrate that endogenous Ago2 and transfected small interfering RNAs (siRNAs) are also present within these same cytoplasmic bodies and that the GW182 protein interacts with Ago2. Disruption of these cytoplasmic foci in HeLa cells interferes with the silencing capability of a siRNA that is specific to lamin-A/C. Our data support a model in which GW182 and/or the microenvironment of the cytoplasmic GWBs contribute to the RNA-induced silencing complex and to RNA silencing.
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