Peptide nucleic acid (PNA) is known to bind with extraordinarily high

Other , 0 Comments

Peptide nucleic acid (PNA) is known to bind with extraordinarily high affinity and sequence-specificity to complementary nucleic acid sequences and can be used to suppress gene manifestation. purely synthetic, it is usually resistant to degradation by nucleases and proteases [18], and thus these molecules may remain in cells for extended time periods [19]. Second, the thermal stability of PNAoligonucleotide complexes is usually significantly higher than corresponding oligonucleotide duplexes. This high stability when bound to its target oligonucleotide should enhance the ability of PNA to suppress protein or gene manifestation. Numerous studies have sought to develop PNA as an antisense agent to suppress protein manifestation by targeting an mRNA sequence [20]. In this way, PNA inhibits translation by sterically blocking translation start sites along mRNA [21]. More recently, PNA has been used as an antigene agent that suppresses gene manifestation by targeting a DNA sequence [22]. The work of the Corey group [23] has elegantly exhibited that PNA designed to target the transcription initiation sites of genes may effectively suppress overall manifestation; by targeting the transcription start site of the gene, the whole gene is usually inhibited, including all splicing forms of the protein, making antigene PNA a powerful inhibitor. To date, only a few genes buy 11021-13-9 have been CD95 targeted using this approach. A key hurdle in the development of PNA as an antisense or antigene agent is usually the effective delivery of PNA to cells [24]. While some cellular systems are permeable to PNA, many cells lines are not [15], [17], [21], so various systems have been developed to deliver PNA to cells. Most of these systems involve covalent conjugation of PNA to another molecule that facilitates delivery into a cell, such as a lipid buy 11021-13-9 or cell-penetrating peptide [22], [25]C[30]. Others chemically change the PNA backbone with multiple arginine side chains to gain entry [31]. Unfortunately, there is usually no delivery system currently available that works with all cells. Therefore, a universally applicable system could facilitate the therapeutic use of PNA. To that end, we investigated the simian computer virus 40 (SV40) packaging systems, no viral genetic material or packaging signal sequence is usually required to form these pseudovirions. To date, SV40 pseudovirions have been shown to deliver reporter genes such as GFP, suicide genes such as and tissues results suggest that delivery of PNA via the SV40 delivery system would be a promising technique to treat certain cancers that exhibit gene as described by Ueda [36]. A detailed BLAST summary of the two sequences indicates that P maps only to the delivery of PNA accomplished by Corey and colleagues [23] used a liposome-based system that packaged DNA/PNA complexes. Although protein manifestation was inhibited using 200 nM concentrations of DNA/PNA, multiple transductions were used. Another strategy that has been employed to deliver PNAs into cells is usually to use antisense or antigene PNA-peptide conjugates, which have several positively charged amino acids linked to the N-terminus of the PNA [22], [28], [37], [38]. These conjugates were shown to effectively silence a protein product, although PNA concentrations between 1C10 M were needed, comparable to the concentrations used in this report. Another strategy reported in the books to boost the inhibitory effect of PNA-peptide conjugates was to add calcium ions [30] or chloroquine [38], [39], which aids in endosome disruption, to the media. These brokers improved the potency of PNA-peptide conjugates but also increased cell death [28]. One of the most significant advantages of the SV40 delivery system used in our studies is usually the high efficiency with which these pseudovirion particles deliver constructs to a broad range of cells [40], [41]. Our studies buy 11021-13-9 demonstrate that by antigene PNA delivered via the SV40 system..