Abstract
Biomolecules such as proteins, DNA, and RNA are macromolecules and can not cross the cell membrane. However, cell-penetrating peptide (CPP) has been shown to deliver therapeutic biomolecules successfully into cells. The various and widely used CPPs including TAT, VP22, and Antp are mostly non-human originated CPPs, and are limited by their potential toxicity and immunogenicity. We report here on a newly identified novel cell-penetrating sequence (LPIN; RRKRRRRRK) from the nuclear localization sequence (NLS) of human nuclear phosphatase, LPIN3. LPIN-EGFP recombinant protein was concentration- and time-dependently delivered into cells and localized to the nucleus as well as the cytoplasm. It penetrated the cell membrane by lipid raft-mediated endocytosis by binding to heparan sulfate proteoglycan. LPIN-EGFP was successfully delivered into primary mouse splenocytes in vitro and it could be delivered into various tissues including liver, kidney, and intestine in mice after intra-peritoneal injection. This research suggests that LPIN-CPP could be used in a drug delivery system to deliver therapeutic biomolecules including peptides, proteins, DNA, and RNA and without the limitations of non-human originated CPPs such as TAT-CPP.
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Lim, S., Kim, Wj., Kim, Yh. et al. Identification of a novel cell-penetrating peptide from human phosphatidate phosphatase LPIN3. Mol Cells 34, 577–582 (2012). https://doi.org/10.1007/s10059-012-0284-y
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DOI: https://doi.org/10.1007/s10059-012-0284-y