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Method of modulating gene expression with reduced immunostimulatory response

  • US 5,968,909 A
  • Filed: 08/04/1995
  • Issued: 10/19/1999
  • Est. Priority Date: 08/04/1995
  • Status: Expired due to Term
First Claim
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1. A method of reducing an immunostimulatory response of a mammal to a phosphorothioate oligonucleotide which comprises:

  • a. modifying at least one chemical structure in the phosphorothioate oligonucleotide to produce an immunostimulatory response-reducing phosphorothioate oligonudeotide, wherein the chemical modification is selected from the group consisting of introducing non-phosphorothioate linkages into the oligonucleotide, altering the degree of substitution with phosphorothioate internucleotide linkages in the oligonucleotide, substituting ribonucleotides for deoxyribonucleotides on the sugar backbone, modifying the terminal ribose, deoxyribose, and phosphate groups to cleave or crosslink to the opposite chains or to associated enzymes or other proteins which bind to the target genome, adding a cholesteryl or diamine compound to the internucleotide linkage group, modifying the sugar to attach at one or both of its 3'"'"' and 5'"'"' positions a chemical group other than hydroxyl or phosphate, capping the oligonucleotide with a nuclease resistance-conferring bulky substituent at one or both of the 3'"'"' and 5'"'"' ends, and substituting one or both nonbridging oxygens in a nucleotide;

    b. administering a therapeutic formulation containing the immunostimulatory response-reducing phosphorothioate oligonucleotide to the mammal; and

    c. monitoring the immune response of the mammal for a reduced immunostimulatory response.

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