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Antisense oligomers and methods for inducing immune tolerance and immunosuppression

an antibody and immunosuppression technology, applied in the field of antibodies and immunosuppression, can solve the problems of immunosuppressive agents with severe side effects, high risk and drawbacks of allogeneic transplantation, and high debilitating or lethal side effects, so as to reduce the capacity for antigen-specific activation of t cells, enhance the expression of extracellular il-10, and increase the production of extracellular il-10

Inactive Publication Date: 2005-10-20
AVI BIOPHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0035] The invention includes, in one aspect, a method of inducing human dendritic cells to a condition of reduced capacity for antigen-specific activation of T cells, and, in mature dendritic cells, increased production of extracellular IL-10. The method includes exposing a population of human dendritic cells to a substantially uncharged antisense compound containing 12-40 subunits and a base sequence effective to hybridize to an expression-sensitive region of a preprocessed or processed human CD-86 transcript identified, in its processed form, by SEQ ID NO:33, to form, between the compound and transcript, a heteroduplex structure having a Tm of at least 45° C. The heteroduplex formation blocks expression of full-length CD86 in the cells, which in turn, produces inhibition of the expression of full-length CD86 on the surface of dendritic cells, and produces enhanced expression of extracellular IL-10 by mature dendritic cells.
[0037] The compound may be covalently linked, at one compound end, to an arginine-rich peptide effective to enhance uptake of the compound into the dendritic cells. Exemplary arginine-rich peptides are those having the sequences SEQ ID NOS: 1 or 2. Where the dendritic cells include a mixture of immature and mature dendritic cells, the arginine-rich peptide may be an rTAT peptide having the sequence identified by SEQ ID NO: 1. This peptide is effective to achieve a greater level of intracellular uptake of the antisense compound into the mature dendritic cells than is achieved (i) in the immature dendritic cells, or (ii) by exposing the mature dendritic cells to the antisense compound in the absence of the rTAT polypeptide.
[0042] For use in treating an autoimmune condition in a human subject, the compound may be administered to the subject, in an amount effective to reduce the severity of the autoimmune condition. The compound may be administered over an extended period of time, as needed, to control the severity of the autoimmune condition in the subject.

Problems solved by technology

However, allogeneic transplantation involves significant risks and drawbacks, including graft rejection, complications from immunosuppressive therapy and graft-versus host disease which are frequently highly debilitating or lethal.
Although immunosuppressive drugs such as cyclosporine may be used in an attempt to modulate rejection, these immunosuppressive agents have severe side effects and often fail to prevent continued rejection episodes.

Method used

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  • Antisense oligomers and methods for inducing immune tolerance and immunosuppression
  • Antisense oligomers and methods for inducing immune tolerance and immunosuppression
  • Antisense oligomers and methods for inducing immune tolerance and immunosuppression

Examples

Experimental program
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Effect test

example 1

Arginine-Rich Peptides Enhance Uptake of Oligomers into Mature Dendritic Cells

[0171] Delivery of antisense molecules without substantial manipulation of the cellular membrane has been an impediment to targeting gene expression in DCs and other immune cell types. These procedures often result in extensive damage to the membrane allowing for only short lived experiments to be conducted. Numerous arginine-rich peptides were examined as to their ability to deliver oligomers to various cell types with no manipulation beyond direct addition to cells cultured under normal conditions. The PMO chemical structure and peptides used in this study are shown in FIG. 4. PMO synthesis and conjugation of peptides and or fluorescein were carried out at AVI BioPharma as previously described (Summerton and Weller 1997; Moulton, Hase et al. 2003; Moulton, Nelson et al. 2004). The arginine-rich peptides shown in FIG. 4 are among several that have been shown to enhance cellular uptake. Fluorescein can be...

example 2

Antisense Inhibition of CD86 Expression Also Alters CD80 Expression

[0174] To determine if the enhanced uptake of the PMO into DCs provided by the peptide conjugates would translate into functional antisense activity we chose to synthesize oligomers targeting the translational start site of CD86 (B7-2 AUG1, SEQ ID NO:15) and a sequence scrambled control oligomer (5′-CGTGGTGCACTGCGTGTGGC-3′). A considerable reduction in the level of CD86 (B7-2) was observed in cultured DCs after treatment with the sequence-specific oligomer and LPS compared to controls (FIG. 6, top histogram). However, when a measure of the level of CD80 (B7-1) was made under the same conditions it was observed that a significant reduction was produced in the cultures treated with antisense to CD86 compared to controls (FIG. 6, bottom histogram). This was unexpected since the CD86 sequence shares little homology with that of CD80 and considerably low levels of homology around the translational start site. Nearly iden...

example 3

Increased DC IL-10 Production is Linked to Diminished CD86 Expression and Not Ligand Interaction

[0176] In light of the results seen in Example 2 we examined the cytokine production profile of the CD86 antisense treated DCs. IL-4 and IL-12 production was not significantly altered in the DCs receiving the B7-2 AUG1 CD86 antisense oligomer (SEQ ID NO:15) compared to controls (data not shown). However, IL-10 production was evident when DCs were treated with a maturation stimulus such as LPS in conjunction with the CD86 antisense oligomer-P002 conjugate (SEQ ID NO:15) and not the P002 peptide alone or a scrambled control sequence conjugated to P002 as shown in Table 3 below. The same result was seen when other delivery peptides were used with SEQ ID NO:15 or alternate sequences targeting the translational start site (SEQ ID NO:16). Furthermore, IL-10 staining was detectable when the DCs were not permeabilized indicating that IL-10 was being secreted from the cells where it could exert a...

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Abstract

A method and composition for inducing human dendritic cells to a condition of reduced capacity for antigen-specific activation of T cells, and, in mature dendritic cells, increased production of extracellular IL-10 is disclosed. A population of dendritic cells is exposed to a substantially uncharged antisense compound containing 12-40 subunits and a base sequence effective to hybridize to an expression-sensitive region of a preprocessed or processed human CD86 transcript identified, in its processed form, by SEQ ID NO:33, to form a duplex structure between said compound and transcript having a Tm of at least 45° C. Formation of the duplex blocks expression of full-length CD86 in said cells, which in turn leads to reduced capacity for antigen-specific activation of T cells, and, in mature dendritic cells, increased production of extracellular IL-10.

Description

[0001] This application claims priority to U.S. Provisional Application No. 60,538,655, filed Jan. 23, 2004, which is incorporated herein by reference in its entirety.FIELD OF THE INVENTION [0002] The present invention relates to compounds and methods of inducing immunological tolerance using a peptide-antisense conjugate to selectively limit costimulation of naïve T-cells by mature dendritic cells and formation of a cytokine microenvironment that augments tolerized T-cells. REFERENCES [0003] Agrawal, S., et al., Proc Natl Acad Sci USA 87(4):1401-5, (1990). [0004] Akhtar, S., et al., Nucleic Acids Res 19(20):5551-9, (1991). [0005] Anderson, C. M., et al., J Neurochem 73(2):867-73, (1999). [0006] Anderson, K. P., et al., Antimicrob Agents Chemother 40(9):2004-11, (1996). [0007] Bonham, M. A., et al., Nucleic Acids Res 23(7):1197-203, (1995). [0008] Borriello, F., et al., J Immunol 155(12):5490-7, (1995). [0009] Boudvillain, M., et al., Biochemistry 36(10):2925-31, (1997). [0010] Cham...

Claims

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Application Information

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IPC IPC(8): A01N43/04A61K31/675A61K48/00C07H21/04C12N15/113
CPCA61K31/675C12N15/1138C12N2310/3513C12N2310/3233C12N2310/11
Inventor MOURICH, DANIVERSEN, PATRICK
Owner AVI BIOPHARMA
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