US20060014289A1 - Methods and compositions for enhancing delivery of double-stranded RNA or a double-stranded hybrid nucleic acid to regulate gene expression in mammalian cells - Google Patents

Methods and compositions for enhancing delivery of double-stranded RNA or a double-stranded hybrid nucleic acid to regulate gene expression in mammalian cells Download PDF

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US20060014289A1
US20060014289A1 US11/107,371 US10737105A US2006014289A1 US 20060014289 A1 US20060014289 A1 US 20060014289A1 US 10737105 A US10737105 A US 10737105A US 2006014289 A1 US2006014289 A1 US 2006014289A1
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canceled
sirna
cholesteryl
cholesterol
spermidine
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Mohammad Ahmadian
Kunyuan Cui
Lishan Chen
Shu-Chih Chen
Michael Houston
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Marina Biotech Inc
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MDRNA Inc
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Assigned to NASTECH PHARMACEUTICAL COMPANY INC. reassignment NASTECH PHARMACEUTICAL COMPANY INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CUI, KUNYUAN, AHMADIAN, MOHAMMAD, CHEN, LISHAN, HOUSTON, JR., MICHAEL E., CHEN, SHU-CHIH
Publication of US20060014289A1 publication Critical patent/US20060014289A1/en
Priority to US12/013,274 priority patent/US20080261304A1/en
Priority to US12/870,989 priority patent/US8940857B2/en
Priority to US14/566,695 priority patent/US20150252369A1/en
Priority to US14/970,529 priority patent/US20160206749A1/en
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Definitions

  • RNA interference is the process of sequence-specific post transcriptional gene silencing in cells initiated by double-stranded RNA (dsRNA) that is homologous in sequence to a portion of a targeted mRNA.
  • dsRNA double-stranded RNA
  • Introduction of dsRNA into cells leads to the destruction of the endogenous RNAs that share the same sequence as the dsRNA.
  • the dsRNA molecules are cleaved by an RNase III family nuclease called Dicer into short-interfering RNAs (siRNA), which are 19-23 nucleotides (nt) in length.
  • siRNAs are incorporated into a multicomponent nuclease complex (RISC, RNA-induced silencing complex), which identifies mRNA substrates through their homology to the siRNA, binds to and destroys the targeted mRNA.
  • RISC RNA-induced silencing complex
  • dsRNAs longer than 30 base pairs can activate the dsRNA-dependent kinase PKR and 2′-5′-oligoadenylate synthetase, normally induced by interferon.
  • synthetic siRNA avoids activation of the interferon response.
  • the activated PKR inhibits general translation by phosphorylation of the translation factor eukaryotic initiation factor 2 ⁇ (eIF2 ⁇ ), while 2′-5′-oligoadenylate synthetase causes nonspecific mRNA degradation via activation of RNase L.
  • eIF2 ⁇ translation factor eukaryotic initiation factor 2 ⁇
  • 2′-5′-oligoadenylate synthetase causes nonspecific mRNA degradation via activation of RNase L.
  • siRNA can mediate selective gene silencing in the mammalian system
  • Hairpin RNA with a short loop and 19 to 27 base pairs in the stem also selectively silences expression of genes that are homologous to the sequence in the double-stranded stem.
  • Mammalian cells can convert short hairpin RNA into siRNA to mediate selective gene silencing.
  • RISC mediates cleavage of single stranded RNA having sequence complementary to the antisense strand of the siRNA duplex. Cleavage of the target RNA takes place in the middle of the region complementary to the antisense strand of the siRNA duplex.
  • siRNA duplexes are most active when containing two nucleotide 3′-overhangs. Furthermore, complete substitution of one or both siRNA strands with 2′-deoxy (2′-H) or 2′-O-methyl nucleotides abolishes RNAi activity, whereas substitution of the 3′-terminal siRNA overhang nucleotides with deoxy nucleotides (2′-H) was shown to be tolerated.
  • RNA interference is emerging as a promising means for reducing the expression of specific gene products, and thus may be useful for developing therapeutic drugs to treat viral infections, cancers, autoimmune diseases, and other diseases and conditions amenable to treatment by down-regulation of mRNA expression.
  • FIG. 1 illustrates serum effects on cellular uptake of a cholesterol-conjugated siRNA in complex with a delivery enhancing agent (comprising a permeabilizing peptide, PN73), and on an unconjugated siRNA in complex with PN73—expressed as percentage uptake.
  • a delivery enhancing agent comprising a permeabilizing peptide, PN73
  • FIG. 2 illustrates serum effects on cellular uptake of a cholesterol-conjugated siRNA in complex with PN73, and on an unconjugated siRNA in complex with PN73—expressed as mean fluorescence intensity (MFI).
  • MFI mean fluorescence intensity
  • FIG. 3 illustrates the effects of increasing concentrations of serum on cellular uptake of a cholesterol-conjugated siRNA in the presence or absence of a second delivery enhancing agent, lipofectamine—expressed as percentage uptake.
  • FIG. 4 illustrates the effects of increasing concentrations of serum on cellular uptake of a cholesterol-conjugated siRNA in the presence or absence of a second delivery enhancing agent, lipofectamine—expressed as MFI.
  • the present invention fulfills these needs and satisfies additional objects and advantages by providing double-stranded nucleic acids conjugated to a cholesterol moiety to facilitate delivery of the nucleic acids into a selected target cell or tissue.
  • the present invention is directed towards methods and compositions to administer double-stranded ribonucleic acid to a mammal so as to effectuate transfection of the double-stranded RNA into a desired tissue of the mammal.
  • the double-stranded RNA has 30 or fewer nucleotides, and is a short interfering RNA (siRNA).
  • siRNA/cholesterol moiety constructs increase the silencing effect of the targeted mRNA in comparison to siRNA having no cholesterol conjugated to it:
  • constructs listed above are embodiments of the present invention, as well as those constructs in which the ds nucleic acid is a siHybrid in which the sense strand is a DNA molecule.
  • the term “inverted repeat” refers to a nucleic acid sequence comprising a sense and an antisense element positioned so that they are able to form a double stranded siRNA when the repeat is transcribed.
  • the inverted repeat may optionally include a linker or a heterologous sequence such as a self-cleaving ribozyme between the two elements of the repeat.
  • the elements of the inverted repeat have a length sufficient to form a double stranded RNA.
  • each element of the inverted repeat is about 15 to about 100 nucleotides in length, preferably about 20-30 base nucleotides, preferably about 20-25 nucleotides in length, e.g., 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 nucleotides in length.
  • “Silencing” refers to partial or complete loss-of-function through targeted inhibition of gene expression in a cell and may also be referred to as “knock down”. Depending on the circumstances and the biological problem to be addressed, it may be preferable to partially reduce gene expression. Alternatively, it might be desirable to reduce gene expression as much as possible. The extent of silencing may be determined by any method known in the art, some of which are summarized in International Publication No. WO 99/32619. Depending on the assay, quantitation of gene expression permits detection of various amounts of inhibition for example, greater than 10%, 33%, 50%, 90%, 95% or 99%.
  • inhibitors expression of a target gene refers to the ability of a siRNA of the invention to initiate gene silencing of the target gene.
  • samples or assays of the organism of interest or cells in culture expressing a particular construct are compared to control samples lacking expression of the construct.
  • Control samples (lacking construct expression) are assigned a relative value of 100%. Inhibition of expression of a target gene is achieved when the test value relative to the control is about 90%, preferably 50%, more preferably 25-0%.
  • Suitable assays include, e.g., examination of protein or mRNA levels using techniques known to those of skill in the art such as dot blots, northern blots, in situ hybridization, ELISA, immunoprecipitation, enzyme function, as well as phenotypic assays known to those of skill in the art.
  • Nucleic acid refers to deoxyribonucleotides or ribonucleotides and polymers thereof in single- or double-stranded form.
  • the term encompasses nucleic acids containing known nucleotide analogs or modified backbone residues or linkages, which are synthetic, naturally occurring, and non-naturally occurring, which have similar binding properties as the reference nucleic acid, and which are metabolized in a manner similar to the reference nucleotides. Examples of such analogs include, without limitation, phosphorothioates, phosphoramidates, methyl phosphonates, chiral-methyl phosphonates, 2-O-methyl ribonucleotides, peptide-nucleic acids (PNAs).
  • PNAs peptide-nucleic acids
  • “Large double-stranded RNA” refers to any double-stranded RNA having a size greater than about 40 base pairs (bp) for example, larger than 100 bp or more particularly larger than 300 bp.
  • the sequence of a large dsRNA may represent a segment of a mRNA or the entire mRNA. The maximum size of the large dsRNA is not limited herein.
  • the double-stranded RNA may include modified bases where the modification may be to the phosphate sugar backbone or to the nucleoside. Such modifications may include a nitrogen or sulfur heteroatom or any other modification known in the art.
  • the double-stranded structure may be formed by self-complementary RNA strand such as occurs for a hairpin or a micro RNA or by annealing of two distinct complementary RNA strands.
  • “Overlapping” refers to when two RNA fragments have sequences which overlap by a plurality of nucleotides on one strand, for example, where the plurality of nucleotides (nt) numbers as few as 2-5 nucleotides or by 5-10 nucleotides or more.
  • One or more dsRNAs refers to dsRNAs that differ from each other on the basis of sequence.
  • Target gene or mRNA refers to any gene or mRNA of interest. Any of the genes previously identified by genetics or by sequencing can be implemented as a target. Target genes or mRNA can include developmental genes and regulatory genes, as well as metabolic or structural genes or genes encoding enzymes. The target gene may be expressed in cells in which a phenotype is being investigated, or in an organism in a manner that directly or indirectly impacts a phenotypic characteristic. The target gene may be endogenous or exogenous. Such cells include any cell in the body of an adult or embryonic animal or plant including gamete or any isolated cell such as occurs in an immortal cell line or primary cell culture.
  • siRNA means a small interfering RNA that is a short-length double-stranded RNA that are not toxic in mammalian cells. The length is not limited to 21 to 23 bp long. There is no particular limitation in the length of siRNA as long as it does not show toxicity. “siRNAs” can be, for example, 15 to 49 bp, preferably 15 to 35 bp, and more preferably 21 to 30 bp long. Alternatively, the double-stranded RNA portion of a final transcription product of siRNA to be expressed can be, for example, 15 to 49 bp, preferably 15 to 35 bp, and more preferably 21 to 30 bp long.
  • the double-stranded RNA portions of siRNAs in which two RNA strands pair up are not limited to the completely paired ones, and may contain nonpairing portions due to mismatch (the corresponding nucleotides are not complementary), bulge (lacking in the corresponding complementary nucleotide on one strand), and the like. Nonpairing portions can be contained to the extent that they do not interfere with siRNA formation.
  • the “bulge” used herein preferably comprise 1 to 2 nonpairing nucleotides, and the double-stranded RNA region of siRNAs in which two RNA strands pair up contains preferably 1 to 7, more preferably 1 to 5 bulges.
  • the “mismatch” used herein is contained in the double-stranded RNA region of siRNAs in which two RNA strands pair up, preferably 1 to 7, more preferably 1 to 5, in number.
  • one of the nucleotides is guanine, and the other is uracil.
  • Such a mismatch is due to a mutation from C to T, G to A, or mixtures thereof in DNA coding for sense RNA, but not particularly limited to them.
  • the double-stranded RNA region of siRNAs in which two RNA strands pair up may contain both bulge and mismatched, which sum up to, preferably 1 to 7, more preferably 1 to 5 in number.
  • the terminal structure of siRNA may be either blunt or cohesive (overhanging) as long as siRNA enables to silence the target gene expression due to its RNAi effect.
  • the cohesive (overhanging) end structure is not limited only to the 3′ overhang as reported by Tuschl et al. (ibid.), and the 5′overhanging structure may be included as long as it is capable of inducing the RNAi effect.
  • the number of overhanging nucleotides is not limited to the reported 2 or 3, but can be any numbers as long as the overhang is capable of inducing the RNAi effect.
  • the overhang may be 1 to 8, or 2 to 4 nucleotides.
  • the total length of siRNA having cohesive end structure is expressed as the sum of the length of the paired double-stranded portion and that of a pair comprising overhanging single-strands at both ends. For example, in the case of 19 bp double-stranded RNA portion with 4 nucleotide overhangs at both ends, the total length is expressed as 23 bp. Furthermore, since this overhanging sequence has low specificity to a target gene, it is not necessarily complementary (antisense) or identical (sense) to the target gene sequence.
  • the siRNA may comprise a low molecular weight RNA (which may be a natural RNA molecule such as tRNA, rRNA or viral RNA, or an artificial RNA molecule), for example, in the overhanging portion at its one end.
  • a low molecular weight RNA which may be a natural RNA molecule such as tRNA, rRNA or viral RNA, or an artificial RNA molecule
  • the terminal structure of the “siRNA” is necessarily the cut off structure at both ends as described above, and may have a stem-loop structure in which ends of one side of double-stranded RNA are connected by a linker RNA.
  • the length of the double-stranded RNA region (stem-loop portion) can be, for example, 15 to 49 bp, preferably 15 to 35 bp, and more preferably 21 to 30 bp long.
  • the length of the double-stranded RNA region that is a final transcription product of siRNAs to be expressed is, for example, 15 to 49 bp, preferably 15 to 35 bp, and more preferably 21 to 30 bp long.
  • the linker portion may have a clover-leaf tRNA structure.
  • the linker portion may include introns so that the introns are excised during processing of precursor RNA into mature RNA, thereby allowing pairing of the stem portion.
  • either end (head or tail) of RNA with no loop structure may have a low molecular weight RNA.
  • this low molecular weight RNA may be a natural RNA molecule such as tRNA, rRNA or viral RNA, or an artificial RNA molecule.
  • Antisense RNA is an RNA strand having a sequence complementary to a target gene mRNA, and thought to induce RNAi by binding to the target gene mRNA.
  • Sense RNA has a sequence complementary to the antisense RNA, and annealed to its complementary antisense RNA to form siRNA. These antisense and sense RNAs have been conventionally synthesized with an RNA synthesizer.
  • RNAi construct is a generic term used throughout the specification to include small interfering RNAs (siRNAs), hairpin RNAs, and other RNA species which can be cleaved in vivo to form siRNAs.
  • RNAi constructs herein also include expression vectors (also referred to as RNAi expression vectors) capable of giving rise to transcripts which form dsRNAs or hairpin RNAs in cells, and/or transcripts which can produce siRNAs in vivo.
  • the siRNA include single strands or double strands of siRNA.
  • siHybrid molecule is a double-stranded nucleic acid that has a similar function to siRNA.
  • a siHybrid is comprised of an RNA strand and a DNA strand.
  • the RNA strand is the antisense strand as that is the strand that binds to the target mRNA.
  • the siHybrid created by the hybridization of the DNA and RNA strands have a hybridized complementary portion and preferably at least one 3′overhanging end.
  • a cholesterol moiety is a cholesterol molecule, sterol or any compound derived from cholesterol including chlolestanol, ergosterol, stimastanol, stigmasterol, methyl-lithocholic acid, cortisol, corticosterone, ⁇ 5 -pregnenolone, progesterone, deoxycorticosterone, 17-OH-pregnenolone, 17-OH-progesterone, 11-dioxycortisol, dehydroepiandrosterone, dehydroepiandrosterone sulfate, androstenedione, aldosterone, 18-hydroxycorticosterone, tetrahydrocortisol, tetrahydrocortisone, cortisone, prednisone, 6 ⁇ -methylpredisone, 9 ⁇ -fluoro- 16 ⁇ -hydroxyprednisolone, 9 ⁇ -fluoro- 16 ⁇ -methylprednisolone, 9 ⁇ -fluoro
  • a cholesterol-conjugated siRNA or siHybrid is formulated with, or delivered in a coordinate administration method with, one or more secondary delivery-enhancing agent(s) that is/are further effective to enhance delivery of the cholesterol-conjugated siRNA or siHybrid into mammalian cells.
  • the second delivery-enhancing agent(s) is/are effective to facilitate delivery of the cholesterol-conjugated siRNA or siHybrid across the plasma membrane and into the cytoplasm of a targeted mammalian cell.
  • the targeted cell may be any cell for which delivery of a cholesterol-conjugated siRNA or siHybrid into the cell for regulation of gene expression is desired.
  • target cells in this context include pulmonary alveolar or other airway cells, skin cells, hepatic cells, renal cells, pancreatic cells, endothelial cells, nucleated blood cells (e.g., lymphocytes, monocytes, macrophages, or dendritic cells), muscle cells (e.g., cardiac or smooth muscle cells), mammary cells, peripheral or central nervous system (CNS) cells, cells of the stomach or intestinal tract, tumor cells, and other cells that are amenable to gene regulation for therapeutic purposes according to the methods and compositions of the invention.
  • nucleated blood cells e.g., lymphocytes, monocytes, macrophages, or dendritic cells
  • muscle cells e.g., cardiac or smooth muscle cells
  • mammary cells e.g., peripheral or central nervous system (CNS) cells
  • CNS central nervous system
  • the cholesterol-conjugated siRNA or siHybrid are targeted for delivery to mucosal epithelial cells, for example nasal mucosal epithelial cells.
  • the secondary delivery-enhancing agent(s) may be selected from one or any combination of the following:
  • a membrane penetration-enhancing agent selected from (i) a surfactant, (ii) a bile salt, (iii) a phospholipid additive, mixed micelle, liposome, or carrier, (iv) an alcohol, (v) an enamine, (vi) an NO donor compound, (vii) a long-chain amphipathic molecule (viii) a small hydrophobic penetration enhancer; (ix) sodium or a salicylic acid derivative; (x) a glycerol ester of acetoacetic acid (xi) a cyclodextrin or beta-cyclodextrin derivative, (xii) a medium-chain fatty acid, (xiii) a chelating agent, (xiv) an amino acid or salt thereof, (xv) an N-acetylamino acid or salt thereof, (xvi) an enzyme degradative to a selected membrane component, (xvii) an inhibitor of fatty acid synthesis, or (xviii) an enzyme de
  • the delivery-enhancing agent(s) comprise(s) any one or any combination of two or more of the foregoing delivery-enhancing agents recited in (a)-(k), and the formulation of the cholesterol-conjugated siRNA or siHybrid with the delivery-enhancing agents provides for increased delivery of the cholesterol-conjugated siRNA or siHybrid into the cytoplasm of target cells for gene regulation by the cholesterol-conjugated siRNA or siHybrid.
  • any one or combination of the foregoing secondary delivery-enhancing agents may be added to a pharmaceutical composition comprising a cholesterol-conjugated siRNA or siHybrid as described herein, to yield a combinatorial formulation providing greater delivery enhancement in comparison to intracellular delivery of the cholesterol-conjugated siRNA or siHybrid without the secondary delivery-enhancing agent(s).
  • the cholesterol-conjugated siRNA or siHybrid is administered to a target cell, tissue, or individual in combination with one or more secondary delivery-enhancing agents in a coordinate administration protocol.
  • the cholesterol-conjugated siRNA or siHybrid is administered to the same cell, tissue, or individual as the secondary delivery-enhancing agent(s), prior to, simultaneous with, or after administration of the secondary delivery-enhancing agent(s), which similarly may be selected from any one or combination of the following:
  • a membrane penetration-enhancing agent selected from (i) a surfactant, (ii) a bile salt, (iii) a phospholipid additive, mixed micelle, liposome, or carrier, (iv) an alcohol, (v) an enamine, (vi) an NO donor compound, (vii) a long-chain amphipathic molecule (viii) a small hydrophobic penetration enhancer; (ix) sodium or a salicylic acid derivative; (x) a glycerol ester of acetoacetic acid (xi) a cyclodextrin or beta-cyclodextrin derivative, (xii) a medium-chain fatty acid, (xiii) a chelating agent, (xiv) an amino acid or salt thereof, (xv) an N-acetylamino acid or salt thereof, (xvi) an enzyme degradative to a selected membrane component, (xvii) an inhibitor of fatty acid synthesis, or (xviii) an enzyme de
  • the coordinate administration of the cholesterol-conjugated siRNA or siHybrid and secondary delivery-enhancing agent(s) provides for increased uptake of the cholesterol-conjugated siRNA or siHybrid into the cytoplasm of targeted cells, typically enhancing gene regulation (e.g., increasing knockdown of mRNA translation to thereby reduce expression of one or more selected protein(s), such as TNF- ⁇ , in the target cell.
  • a delivery-enhancing peptide is employed as the secondary delivery-enhancing agent.
  • the delivery-enhancing peptide may be conjugated to, combinatorially formulated with, or coordinately administered with, the cholesterol-conjugated siRNA or siHybrid to enhance intracellular uptake of the cholesterol-conjugated siRNA or siHybrid and improve gene regulation results achieved thereby.
  • Delivery-enhancing peptides in this context may include natural or synthetic, therapeutically or prophylactically active, peptides (comprised of two or more covalently linked amino acids), proteins, peptide or protein fragments, peptide or protein analogs, peptide or protein mimetics, and chemically modified derivatives or salts of active peptides or proteins.
  • delivery-enhancing peptide will often be intended to embrace all of these active species, i.e., peptides and proteins, peptide and protein fragments, peptide and protein analogs, peptide and protein mimetics, and chemically modified derivatives and salts of active peptides or proteins.
  • the delivery-enhancing peptide comprises a mutein that is readily obtainable by partial substitution, addition, or deletion of amino acids within a naturally occurring or native (e.g., wild-type, naturally occurring mutant, or allelic variant) peptide or protein sequence (e.g., a sequence of a naturally occurring “cell penetrating peptide” or peptide fragment of a native protein, such as a tight junction protein).
  • a naturally occurring or native e.g., wild-type, naturally occurring mutant, or allelic variant
  • biologically active fragments of native peptides or proteins are included. Such mutant derivatives and fragments substantially retain the desired cell penetrating or other delivery-enhancing activity of the corresponding native peptide or proteins.
  • biologically active variants marked by alterations in these carbohydrate species are also included within the invention.
  • the delivery-enhancing peptides, proteins, analogs and mimetics for use within the methods and compositions of the invention are may be conjugated to, or formulated with, the cholesterol-conjugated siRNA or siHybrid to yield a pharmaceutical composition that includes a delivery-enhancing effective amount of the delivery-enhancing peptide, protein, analog or mimetic (i.e., an amount of the peptide sufficient to detectably enhance intracellular delivery of the cholesterol-conjugated siRNA or siHybrid).
  • Exemplary delivery-enhancing peptides for use within the methods and compositions of the invention include any one or combination of the following peptides, or active fragments, muteins, conjugates, or complexes thereof: RKKRRQRRRPPQCAAVALLPAVLLALLAP; (SEQ ID NO:1) RQIKIWFQNRRMKWKK; (SEQ ID NO:2) GWTLNSAGYLLGKINLKALAALAKKIL; (SEQ ID NO:3) KLLALKLALKALKAALKLA; (SEQ ID NO:4) KLWSAWPSLWSSLWKP; (SEQ ID NO:7) AAVALLPAVLLALLAPRKKRRQRRRPPQ; (SEQ ID NO:8) LLETLLKPFQCRICMRNFSTRQARRNHRRRHRR; (SEQ ID NO:9) RRRQRRKRGGDIMGEWGNEIFGAIAGFLG; (SEQ ID NO:10) KETWWETWWTEWSQPGRKKRRQRRRPPQ; (SEQ ID NO
  • Delivery-enhancing peptides of the invention may further include various modifications known in the art, e.g., for modifying the charge, membrane permeability, half-life, degradative potential, reactivity (e.g., to form conjugates), immunogenicity, or other desired properties of the subject peptide.
  • exemplary modified delivery-enhancing peptides in this context may include, for example, peptides modified by incorporation of one or more selected amino- or carboxy-terminal chemical modifications.
  • amino- and/or carboxy-terminal amide, BrAc, or maleimide groups may be included, as exemplified by the modified delivery-enhancing peptides shown in Table 1.
  • the + and ⁇ notations indicated in Table 1 for the listed peptides relate to activity of the peptides to enhance permeation of across epithelial monolayers—as determined by measurement of peptide-mediated changes in trans-epithelial electrical resistance (TEER).
  • TEER trans-epithelial electrical resistance
  • a + notation indicates that the subject peptide enhances epithelial permeation of macromolecules.
  • the peptides that exhibit permeation-enhancing activity can be tested and selected according to the methods herein to determine their utility for enhancing delivery of cholesterol-conjugated siRNA or siHybrid into the cytoplasm of targeted cells to enhance gene regulation
  • Unmodified siRNAs were synthesized according to the general strategy for solid-phase oligonucleotide synthesis. The syntheses proceeded from the 3′- to 5′-direction [current protocols in nucleic acid chemistry, chapter 3]. The first step involved attachment of a mononucleoside/tide to the surface of an insoluble solid support through a covalent bond. All unmodified siRNAs described here were synthesized starting with a CPG-bound deoxythymidine (purchased from Glen Research, Sterling Va.). The thymidine nucleoside is covalently attached to the solid support through 3 ′-hydroxyl group using a base labile linker.
  • the terminal-protecting group (dimethoxytrityl, DMT) on the nucleoside is removed. This exposes a free 5′-OH group where the next nucleotide unit can be added.
  • An excess of reagents is used to force the coupling reaction to occur on as many of the immobilized nucleotides as possible.
  • excess reagents are washed away.
  • the reaction is followed by a c capping step, to block off non-extended sites, and an oxidation step.
  • the process of terminal-protecting group removal and chain extension is then repeated using different bases until the desired sequence has been assembled.
  • Some or all of the protecting groups may optionally be removed, and then the covalent attachment to the support is hydrolyzed to release the product. Removal of the protecting groups were carried out with 3:1 mixture of concentrated ammonia:ethanol. After removal of any remaining protecting groups, the oligonucleotide is ready for purification and use.
  • RNA syntheses were carried out by Applied Biosystems 3400 using standard phosphoramidite chemistry.
  • 5′-dimethoxytrityl-N-dimethylformamidine-guanosine 2′-O-(t-butyldimethylsilyl)-3′-[(2-cyanoethyl)-(N,N-diisopropyl)]-phosphoramidite(dmf-G-CE phosphoramidite) (II)
  • CPG Controlled Pore glass
  • VI deoxytimidine
  • Other reagents and solvents were purchased from Glen Research (Sterling, Va.) and/or Applied Biosystems (Foster City, Calif.).
  • 3′-cholestery-labelled siRNAs was carried out using the modified support strategy.
  • a new modified solid phase synthesis support must be prepared for ach 3′-reporter group or conjugate.
  • the solid phase support for attaching cholesteryl group to the 3′-termini of oligonucleotides is commercially available.
  • the synthesis of the 3′-cholesteryl-labelled oligonucleotides were accomplished using 1-dimethoyxytrityloxy-3-O-(N-cholesteryl-3-aminopropyl)-triethyleneglycol-glyceryl-2-O-succinoyl-long-chain-alkylamino-CPG (VII, Glen Research, Sterling Va.).
  • the designed 21 nucleotide sequence was then assembled on this modified solid support using standard phosphoramidite protocols for RNA synthesis as described herein above.
  • a protected oligonucleotide with a free hydroxyl group at the 5′-end, immobilized on the solid support may easily be obtained by solid phase synthesis using either methodologies described herein above.
  • the 5′-terminal hydroxyl can then be reacted with phosphoramidites.
  • Phosphoramidites often obtained from a molecule having a hydroxyl functionality allow the direct introduction of a functional group or ligand to the chain after oxidation and deprotection.
  • dimethoxytrityloxy-3-O-(N-cholesteryl-3-aminopropyl)-triethyleneglycol-glyceryl-2-O-(2-cyanoethyl)-(N,N,-diisopropyl)-phosphoramidite was purchased from Glen Research (Sterling, Va.).
  • the 5′-dimethoyxtrytyl protecting group was cleaved and VIII was coupled to the grown chain
  • Syntheses of 3′,5′-dicholesteryl-labeled siRNAs were accomplished using a combination of the methods described above.
  • the synthesis of such a molecule started with using VII as the “modified solid support”, and elongation and incorporation of the 5′-cholesteryl moiety were carried out as described above.
  • the transfection was performed with either regular siRNA or cholesterol-conjugated siRNA with lipofectamine (Invitrogen) on 9L/beta-gal cells.
  • the siRNA was designed to specifically knock down beta-galactosidase mRNA and activities are expressed as percentage of beta-gal activities from control (transfected cells by lipofectamine alone).
  • Table 1 above provides results of transfection and mRNA silencing experiments using the siRNA constructs made using sense and antisense strands designated above.
  • the transfection and silencing assay results show cholesterol-enhanced delivery of exemplary siRNAs of the invention, and demonstrate silencing of the beta-galactosidase mRNA by the cholesterol-conjugated siRNAs.
  • the “Activity (% of control)” indicates the beta-galactosidase activity remaining after the transfection. The lower the percentage, the greater was the efficacy of the siRNA construct.
  • the double letters represent a double-stranded siRNA.
  • the exemplary constructs, BE, AF, BA, CA, CF, and AE are representative of the nature and activity of cholesterol conjugated dsRNAs of the present invention. These constructs show greater silencing efficacy than the corresponding unconjugated siRNAs.
  • siRNA constructs CE, AG, BF, DA, BG, DF, DE, CG and DG showed lower efficacy than the unconjugated siRNA construct AA.
  • AA is a siRNA construct with no cholesterol conjugated to any of the ends of the sense or antisense RNA strands. This construct was transfected into the cells resulting in silencing of the beta-galactosidase mRNA so that 23.12% of the activity of the beta-galactosidase mRNA remained.
  • BE is a siRNA construct having a cholesterol moiety linked to the 5′ end of the sense strand and a cholesterol moiety linked to the 5′ end of the antisense strand, and no cholesterol moiety linked to the other ends of the siRNA.
  • This construct was transfected into the cells resulting in silencing the beta-galactosidase mRNA so that only 10.27% of the activity of the beta-galactosidase mRNA remained. This is unexpectedly superior to the unconjugated siRNA.
  • AF is a siRNA construct having a cholesterol moiety linked to the 3′ end of the antisense strand and no cholesterol moiety linked to the other ends of the siRNA strands. This construct was transfected into the cells resulting in silencing the beta-galactosidase mRNA so that only 11.99% of the activity of the beta-galactosidase mRNA remained. This is unexpectedly superior to the unconjugated siRNA.
  • BA is a siRNA construct having a cholesterol moiety linked to the 5′ end of the sense strand and no cholesterol moiety linked to the other ends of the siRNA strands. This construct was transfected into the cells resulting in silencing the beta-galactosidase mRNA so that only 12.09% of the activity of the beta-galactosidase mRNA remained. This is unexpectedly superior to the unconjugated siRNA.
  • CA is a siRNA construct having a cholesterol moiety linked to the 3′ end of the sense strand and no cholesterol moiety linked to the other ends of the siRNA strands. This construct was transfected into the cells resulting in silencing the beta-galactosidase mRNA so that only 16.18% of the activity of the beta-galactosidase mRNA remained. This is unexpectedly superior to the unconjugated siRNA.
  • CF is a siRNA construct having a cholesterol moiety linked to the 3′ end of the sense strand, a cholesterol moiety linked to the 3′ end of the antisense strand, and no cholesterol moiety linked to the other ends of the siRNA strands.
  • This construct was transfected into the cells resulting in silencing the beta-galactosidase mRNA so that only 16.76% of the activity of the beta-galactosidase mRNA remained. This is unexpectedly superior to the unconjugated siRNA.
  • AE is a siRNA construct having a cholesterol moiety linked to the 5′ end of the antisense strand and no cholesterol moiety linked to the other ends of the siRNA strands. This construct was transfected into the cells resulting in silencing the beta-galactosidase mRNA so that only 19.02% of the activity of the beta-galactosidase mRNA remained. This is unexpectedly superior to the unconjugated siRNA.
  • constructs listed below showed lower ability to silence the beta-galactosidase reporter than was determined for the corresponding, unconjugated siRNA.
  • CE is a siRNA construct having a cholesterol moiety linked to the 3′ end of the sense strand, a cholesterol moiety linked 5′ end of the antisense strand, and no cholesterol moiety linked to the other ends of the siRNA strands.
  • This construct was transfected into the cells resulting in silencing the beta-galactosidase mRNA so that 27.62% of the activity of the beta-galactosidase mRNA remained. This silencing effect was lower than that observed for the corresponding, unconjugated siRNA.
  • siRNA construct having a cholesterol moiety linked to the 3′ end of the antisense strand, a cholesterol moiety linked to the 5′ end of the antisense strand, and no cholesterol moiety linked to the other ends of the siRNA strands.
  • This construct was transfected into the cells resulting in silencing the beta-galactosidase mRNA so that 29.87% of the activity of the beta-galactosidase mRNA remained. This silencing effect was lower than that observed for the corresponding, unconjugated siRNA.
  • BF is a siRNA construct having a cholesterol moiety linked to the 5′ end of the sense strand, a cholesterol moiety linked to the 3′ end of the antisense strand, and no cholesterol moiety linked to the other ends of the siRNA strands.
  • This construct was transfected into the cells resulting in silencing the beta-galactosidase mRNA so that 32.02% of the activity of the beta-galactosidase mRNA remained. This silencing effect was lower than that observed for the corresponding, unconjugated siRNA.
  • DA is a siRNA construct having a cholesterol moiety linked to 5′ end of the sense strand, a cholesterol moiety linked to the 3′ end of the sense strand, and no cholesterol moiety linked to the other ends of the siRNA strands.
  • This construct was transfected into the cells resulting in silencing the beta-galactosidase mRNA so that 33.99% of the activity of the beta-galactosidase mRNA remained. This silencing effect was lower than that observed for the corresponding, unconjugated siRNA.
  • BG is a siRNA construct having a cholesterol moiety linked to 5′ end of the sense strand, a cholesterol moiety linked to the 3′ end of the antisense strand, a cholesterol moiety linked to the 5′ end of the antisense strand, and no cholesterol moiety linked to the 3′ end of the sense strand.
  • This construct was transfected into the cells resulting in silencing the beta-galactosidase mRNA so that 46.39% of the activity of the beta-galactosidase mRNA remained. This silencing effect was lower than that observed for the corresponding, unconjugated siRNA.
  • DF is a siRNA construct having a cholesterol moiety linked to 5′ end of the sense strand, a cholesterol moiety linked to the 3′ end of the sense strand, a cholesterol moiety linked to the 3′ end of the antisense strand, and no cholesterol moiety linked to the 5′ end of the antisense strand.
  • This construct was transfected into the cells resulting in silencing the beta-galactosidase mRNA so that 65.40% of the activity of the beta-galactosidase mRNA remained. This silencing effect was lower than that observed for the corresponding, unconjugated siRNA.
  • DE is a siRNA construct having a cholesterol moiety linked to 5′ end of the sense strand, a cholesterol moiety linked to the 3′ end of the sense strand, a cholesterol moiety linked to the 5′ end of the antisense strand and no cholesterol moiety linked to the 3′ end of the antisense strand.
  • This construct was transfected into the cells resulting in silencing the beta-galactosidase mRNA so that 77.12% of the activity of the beta-galactosidase mRNA remained. This silencing effect was lower than that observed for the corresponding, unconjugated siRNA.
  • BG is a siRNA construct having a cholesterol moiety linked to 3′ end of the sense strand, a cholesterol moiety linked to the 3′ end of the sense strand, a cholesterol moiety linked to the 3′ end of the antisense strand, a cholesterol moiety linked to the 5′ end of the antisense strand, and no cholesterol moiety linked to the 5′ end of the sense strand.
  • This construct was transfected into the cells resulting in silencing the beta-galactosidase mRNA so that 77.80% of the activity of the beta-galactosidase mRNA remained. This silencing effect was lower than that observed for the corresponding, unconjugated siRNA.
  • DG is a siRNA construct having a cholesterol moiety on the 5′ end of the sense strand, a cholesterol moiety on the 3′ end of the sense strand, a cholesterol moiety on the 3′ end of the antisense strand, and a cholesterol moiety on the 5′ end of the antisense strand.
  • This construct was transfected into the cells resulting in silencing the beta-galactosidase mRNA so that 98.84% of the activity of the beta-galactosidase mRNA remained. This silencing effect was lower than that observed for the corresponding, unconjugated siRNA.
  • PBMC Peripheral blood mononuclear cells
  • MILTENYI BIOTEC GmbH Germany
  • the purity of the monocytes was greater than 95%, judged by flow cytometry stained with anti-CD14 antibody (BD Biosciences, CA). Purified human monocytes were maintained overnight in complete media before induction and knockdown assay.
  • Fluorescence activated cell sorting analysis were performed using Beckman Coulter FC500 cell analyzer (Fullerton, Calif.). The instrument was adjusted according to the fluorescence probes used (FAM or Cy5 for siRNA and FITC and PE for CD14). Propidium iodide (Fluka, St Lois, Mo.) and Annexin V (R&D systems, Minneapolis, Minn.) were used as indicators for cell viability and cytotoxicity.
  • siRNA uptake analysis cells were washed with PBS, treated with trypsin (attached cells only), and then analyzed by flow cytometry. Uptake of the siRNA designated BA, described above, was also measured by intensity of Cy5 or FAM fluorescence in the cells and cellular viability assessed by addition of propidium iodide or Annexin V-PE. In order to differentiate the cellular uptake from the membrane insertion of fluorescence labeled siRNA, trypan blue was used to quench the fluorescence on the cell membrane surface. TABLE 2 Higher MFI with PN73 compared with cholesterol siRNA alone Unconjugated siRNA with Serum Cholesterol siRNA alone 20 ⁇ M PN73 0 24.8 32.9 5% 1.55 11.5 10% 1.34 6.39 20% 1.19 5.85
  • FIGS. 1 and 2 illustrate the effects of 5% serum on cellular uptake of a cholesterol-conjugated siRNA according to the invention in complex with a permeabilizing peptide delivery enhancing agent, PN73 (cholesterol siRNA+PN73), and on an unconjugated siRNA in complex with PN73 (siRNA+PN73).
  • PN73 cholesterol-conjugated siRNA and siRNA/PN73 complex were transfected into human monocytes in Opti-MEM®) media (Invitrogen) as described above, with serum added in fixed or varied concentration(s).
  • the final concentration of siRNA for both cholesterol and complex were 0.2 ⁇ M.
  • the uptake efficiency and Mean fluorescence intensity were assessed by flow cytometry.
  • the cellular uptake values shown in FIGS. 1 and 2 were determined with variation of PN73 concentrations in the presence of a fixed, 5% concentration of serum.
  • FIGS. 3 and 4 illustrate the effects of varying concentrations of serum on cellular uptake of a cholesterol-conjugated siRNA in the presence or absence of a second delivery enhancing agent, lipofectamine, as determined by flow cytometry.
  • a permeabilizing peptide to a delivery formulation comprising a siRNA conjugated to a cholesterol moiety reduces the inhibitory effects of serum on cholesterol-siRNA uptake in a dose dependent manner.
  • additional delivery-enhancing agents including, but not limited to, Lipofectamine and PN73, can further enhance siRNA delivery to mammalian cells and tissues in vitro and in vivo.

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WO2006019430B1 (en) 2006-10-26
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US20150252369A1 (en) 2015-09-10
US8940857B2 (en) 2015-01-27
JP4635046B2 (ja) 2011-02-16
US20100316707A1 (en) 2010-12-16
CA2564616C (en) 2016-08-30
CA2564616A1 (en) 2006-02-23
WO2006019430A2 (en) 2006-02-23
EP1773998A2 (de) 2007-04-18
WO2006019430A3 (en) 2006-06-01
JP2007533323A (ja) 2007-11-22
EP2145957A1 (de) 2010-01-20
MXPA06012076A (es) 2007-01-25
US20080261304A1 (en) 2008-10-23

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