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- W2549659475 abstract "Abstract The ability to safely and effectively neutralize anticoagulant activity is of particular importance in the case of long acting drugs. While antisense oligonucleotides (ASOs) benefit from their slow clearance rate from liver (t1/2 approx 10 days in mice) which permits infrequent dosing, the potential necessity to reverse ASO drug activity presents a challenge. ISIS 401025 is a second generation ASO targeting prothrombin RNA that has previously been shown to reduce thrombin generation and prolong PT and aPTT as a result of depleting prothrombin mRNA levels in mice. To explore the possibility of developing an “antidote” strategy for ASO-mediated anticoagulation, we designed a sense oligonucleotide, ISIS 405277, complementary to the ISIS 401025 sequence and examined its ability to reverse the effects of prior treatment with ISIS 401025 in mice. A PT-INR of 3.0 was established after 3 weeks of treatment with ISIS 401025 at a weekly dose of 60 mg/kg, corresponding to a reduction of prothrombin mRNA transcript levels of 96%. A single injection of the sense oligonucleotide, ISIS 405277, resulted in a dose-dependent reversal of INR to 1.6, 1.1, and 0.9 three days after injection of 30, 60, and 90 mg/kg, respectively. Corresponding prothrombin transcript levels in liver tissue were returned to 18.4%, 27.8%, and 38.9% of normal levels, respectively. Results from a study designed to determine the kinetics of reversal of anticoagulation indicated that a 50% reduction of PT-INR 4.3, established following 3 weeks of treatment with ISIS 401025, required 11 days in the absence of subsequent treatment, while the reduction was achieved in 2.2 days following a single administration of 90 mg/kg of sense oligonucleotide. When mice were pretreated with an ASO targeting prothrombin that was not complementary to the sense oligonucleotide (ISIS 40527), sense oligonucleotide treatment was unable to reverse either target depletion or anticoagulation, indicating a sequence-specific antidote effect. These results demonstrate for the first time that subsequent administration of a sense strand oligonucleotide can neutralize ASO mediated target RNA degradation in animals, and demonstrates its potential utility in reversing ASO-based activity for anticoagulation." @default.
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- W2549659475 date "2007-11-16" @default.
- W2549659475 modified "2023-10-16" @default.
- W2549659475 title "A Sense Oligonucleotide Specifically Reverses the Prothrombin Depletion and Anticoagulation Caused by ISIS 401025, an Antisense Oligonucleotide Targeting Prothrombin RNA in Mice." @default.
- W2549659475 doi "https://doi.org/10.1182/blood.v110.11.926.926" @default.
- W2549659475 hasPublicationYear "2007" @default.
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