Brief Funct Genomic Proteomic. 2007 Jun;6(2):112-9. Epub 2007 Jul 31.

Exploring cell type-specific internalizing antibodies for targeted delivery of siRNA.

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Department of Anesthesia, University of California at San Francisco, CA 94110, USA. liub@anesthesia.ucsf.edu

Abstract

A major challenge to the development of therapeutic small interfering RNAs (siRNAs) is specific and efficient in vivo delivery to target cells. Recent studies suggest that cell type-specific gene silencing in vivo can be achieved by combining siRNAs with cell type-specific affinity ligands such as monoclonal antibodies. The antibody-directed siRNA complex enters target cells through receptor endocytosis and is subsequently released to the cytosol to specifically silence target gene expression through biologically conserved RNA interference (RNAi) pathways. Antibody fragments fused with a small basic nucleic-acid-binding protein and antibody fragment-directed nanoimmunoliposomes are two examples of effective delivery vehicles in vivo. The demonstrated specificity of in vivo gene silencing and the lack of nonspecific immune activation and systemic toxicity encourage further development of therapies based on cell type-specific delivery of siRNA.

PMID:: 17670766; [PubMed - indexed for MEDLINE]

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