Trimeric Small Interfering RNAs and Their Cholesterol-Containing Conjugates Exhibit Improved Accumulation in Tumors, but Dramatically Reduced Silencing Activity
Cholesterol derivatives of nuclease-resistant, anti-<i>MDR1</i> small-interfering RNAs were designed to contain a 2’-OMe-modified 21-bp siRNA and a 63-bp TsiRNA in order to investigate their accumulation and silencing activity in vitro and in vivo. The results showed that increasing the...
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MDPI AG
2020-04-01
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| Series: | Molecules |
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| author | Ivan V. Chernikov Daniil V. Gladkikh Ulyana A. Karelina Mariya I. Meschaninova Alya G. Ven’yaminova Valentin V. Vlassov Elena L. Chernolovskaya |
| author_facet | Ivan V. Chernikov Daniil V. Gladkikh Ulyana A. Karelina Mariya I. Meschaninova Alya G. Ven’yaminova Valentin V. Vlassov Elena L. Chernolovskaya |
| author_sort | Ivan V. Chernikov |
| collection | DOAJ |
| description | Cholesterol derivatives of nuclease-resistant, anti-<i>MDR1</i> small-interfering RNAs were designed to contain a 2’-OMe-modified 21-bp siRNA and a 63-bp TsiRNA in order to investigate their accumulation and silencing activity in vitro and in vivo. The results showed that increasing the length of the RNA duplex in such a conjugate increases its biological activity when delivered using a transfection agent. However, the efficiency of accumulation in human drug-resistant KB-8-5 cells during delivery in vitro in a carrier-free mode was reduced as well as efficiency of target gene silencing. TsiRNAs demonstrated a similar biodistribution in KB-8-5 xenograft tumor-bearing SCID mice with more efficient accumulation in organs and tumors than cholesterol-conjugated canonical siRNAs; however, this accumulation did not provide a silencing effect. The lack of correlation between the accumulation in the organ and the silencing activity of cholesterol conjugates of siRNAs of different lengths can be attributed to the fact that trimeric Ch-TsiRNA lags mainly in the intercellular space and does not penetrate sufficiently into the cytoplasm of the cell. Increased accumulation in the organs and in the tumor, by itself, shows that using siRNA with increased molecular weight is an effective approach to control biodistribution and delivery to the target organ. |
| first_indexed | 2024-03-10T20:22:22Z |
| format | Article |
| id | doaj.art-9855b7ac768443a4983228cea32b11ab |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T20:22:22Z |
| publishDate | 2020-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-9855b7ac768443a4983228cea32b11ab2023-11-19T22:03:41ZengMDPI AGMolecules1420-30492020-04-01258187710.3390/molecules25081877Trimeric Small Interfering RNAs and Their Cholesterol-Containing Conjugates Exhibit Improved Accumulation in Tumors, but Dramatically Reduced Silencing ActivityIvan V. Chernikov0Daniil V. Gladkikh1Ulyana A. Karelina2Mariya I. Meschaninova3Alya G. Ven’yaminova4Valentin V. Vlassov5Elena L. Chernolovskaya6Institute of Chemical Biology and Fundamental Medicine SB RAS, Novosibirsk 630090, RussiaInstitute of Chemical Biology and Fundamental Medicine SB RAS, Novosibirsk 630090, RussiaInstitute of Chemical Biology and Fundamental Medicine SB RAS, Novosibirsk 630090, RussiaInstitute of Chemical Biology and Fundamental Medicine SB RAS, Novosibirsk 630090, RussiaInstitute of Chemical Biology and Fundamental Medicine SB RAS, Novosibirsk 630090, RussiaInstitute of Chemical Biology and Fundamental Medicine SB RAS, Novosibirsk 630090, RussiaInstitute of Chemical Biology and Fundamental Medicine SB RAS, Novosibirsk 630090, RussiaCholesterol derivatives of nuclease-resistant, anti-<i>MDR1</i> small-interfering RNAs were designed to contain a 2’-OMe-modified 21-bp siRNA and a 63-bp TsiRNA in order to investigate their accumulation and silencing activity in vitro and in vivo. The results showed that increasing the length of the RNA duplex in such a conjugate increases its biological activity when delivered using a transfection agent. However, the efficiency of accumulation in human drug-resistant KB-8-5 cells during delivery in vitro in a carrier-free mode was reduced as well as efficiency of target gene silencing. TsiRNAs demonstrated a similar biodistribution in KB-8-5 xenograft tumor-bearing SCID mice with more efficient accumulation in organs and tumors than cholesterol-conjugated canonical siRNAs; however, this accumulation did not provide a silencing effect. The lack of correlation between the accumulation in the organ and the silencing activity of cholesterol conjugates of siRNAs of different lengths can be attributed to the fact that trimeric Ch-TsiRNA lags mainly in the intercellular space and does not penetrate sufficiently into the cytoplasm of the cell. Increased accumulation in the organs and in the tumor, by itself, shows that using siRNA with increased molecular weight is an effective approach to control biodistribution and delivery to the target organ.https://www.mdpi.com/1420-3049/25/8/1877siRNATsiRNA2’-O-methyl modificationscholesterol conjugatesDicer-substrate siRNA<i>MDR1</i> |
| spellingShingle | Ivan V. Chernikov Daniil V. Gladkikh Ulyana A. Karelina Mariya I. Meschaninova Alya G. Ven’yaminova Valentin V. Vlassov Elena L. Chernolovskaya Trimeric Small Interfering RNAs and Their Cholesterol-Containing Conjugates Exhibit Improved Accumulation in Tumors, but Dramatically Reduced Silencing Activity Molecules siRNA TsiRNA 2’-O-methyl modifications cholesterol conjugates Dicer-substrate siRNA <i>MDR1</i> |
| title | Trimeric Small Interfering RNAs and Their Cholesterol-Containing Conjugates Exhibit Improved Accumulation in Tumors, but Dramatically Reduced Silencing Activity |
| title_full | Trimeric Small Interfering RNAs and Their Cholesterol-Containing Conjugates Exhibit Improved Accumulation in Tumors, but Dramatically Reduced Silencing Activity |
| title_fullStr | Trimeric Small Interfering RNAs and Their Cholesterol-Containing Conjugates Exhibit Improved Accumulation in Tumors, but Dramatically Reduced Silencing Activity |
| title_full_unstemmed | Trimeric Small Interfering RNAs and Their Cholesterol-Containing Conjugates Exhibit Improved Accumulation in Tumors, but Dramatically Reduced Silencing Activity |
| title_short | Trimeric Small Interfering RNAs and Their Cholesterol-Containing Conjugates Exhibit Improved Accumulation in Tumors, but Dramatically Reduced Silencing Activity |
| title_sort | trimeric small interfering rnas and their cholesterol containing conjugates exhibit improved accumulation in tumors but dramatically reduced silencing activity |
| topic | siRNA TsiRNA 2’-O-methyl modifications cholesterol conjugates Dicer-substrate siRNA <i>MDR1</i> |
| url | https://www.mdpi.com/1420-3049/25/8/1877 |
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