.Three different preparation methods were used to make three distinct siRNA nanosome samples (Fig. 1). For the first preparation method, freshly prepared protamine sulfate solution in DEPC-treated water was added drop wise to an aqueous solution of siRNA while vortexing the solution at a moderate speed. siRNA and protamine sulfate condensation was continued for 40 min at room temperature. Following siRNA-protamine sulfate condensation, freshly-prepared, pre-warmed liposome was added to the mixture. The final preparation was mixed rapidly by pipetting up and down 30 times. Freshly-prepared trehalose solution in DEPC-treated water was added and vortexed to allow thorough mixing of the nanosomes and trehalose. This first prepared sample was designated siRNA nanosomes. The siRNA nanosomes were aliquoted into several tubes; each containing 15 μg of siRNA entrapped in the siRNA nanosomes. The different tubes corresponded to the different storage time periods for the sample. All of these siRNA nanosome samples were kept at −80 °C for 2 h followed by lyophilization for 5 days. After lyophilization, the samples were collected, sealed and kept in a desiccator at 4 °C. The stored samples were removed at each storage time: Day 1 (D1), Month 1 (M1), Month 2 (M2), and Month 3 (M3). At each time point, the lyophilized siRNA nanosome powder was reconstituted with DEPC-treated water
.Three different preparation methods were used to make three distinct siRNA nanosome samples (Fig. 1). For the first preparation method, freshly prepared protamine sulfate solution in DEPC-treated water was added drop wise to an aqueous solution of siRNA while vortexing the solution at a moderate speed. siRNA and protamine sulfate condensation was continued for 40 min at room temperature. Following siRNA-protamine sulfate condensation, freshly-prepared, pre-warmed liposome was added to the mixture. The final preparation was mixed rapidly by pipetting up and down 30 times. Freshly-prepared trehalose solution in DEPC-treated water was added and vortexed to allow thorough mixing of the nanosomes and trehalose. This first prepared sample was designated siRNA nanosomes. The siRNA nanosomes were aliquoted into several tubes; each containing 15 μg of siRNA entrapped in the siRNA nanosomes. The different tubes corresponded to the different storage time periods for the sample. All of these siRNA nanosome samples were kept at −80 °C for 2 h followed by lyophilization for 5 days. After lyophilization, the samples were collected, sealed and kept in a desiccator at 4 °C. The stored samples were removed at each storage time: Day 1 (D1), Month 1 (M1), Month 2 (M2), and Month 3 (M3). At each time point, the lyophilized siRNA nanosome powder was reconstituted with DEPC-treated water
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