Video Experimental Relacionado
Updated: Jul 6, 2026

06:53
A Simple Alternative to Stereotactic Injection for Brain Specific Knockdown of miRNA
Published on: December 26, 2015
El silenciamiento del microARN mediado por LNA en primates no humanos
Joacim Elmén1, Morten Lindow, Sylvia Schütz
1Santaris Pharma, Bøge Allé 3, DK-2970 Hørsholm, Denmark.
Nature
|March 28, 2008
Resumen
La administración sistémica de oligonucleótidos modificados con ácido nucleico bloqueado (LNA-antimiR) silenciará efectivamente los microARN expresados en el hígado (miRNA) en primates no humanos. Este enfoque reduce el colesterol plasmático sin toxicidad observada, mostrando un potencial terapéutico.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Molecular Biología Molecular
- Farmacología Farmacología.
Sus antecedentes:
- Los microARN (miARN) son reguladores cruciales en los procesos biológicos y las enfermedades.
- La orientación terapéutica de los miARN es un desafío, especialmente en los primates.
- Los métodos de silenciamiento de miRNA existentes tienen limitaciones para aplicaciones in vivo.
Objetivo del estudio:
- Investigar la eficacia y seguridad de los oligonucleótidos modificados por ácido nucleico bloqueado (LNA-antimiRs) administrados sistémicamente para el antagonismo del miRNA en primates no humanos.
- Evaluar el potencial de los LNA-antimiRs como estrategia terapéutica para enfermedades que involucran miRNAs específicos.
Principales métodos:
- Administración intravenosa sistémica de antimiRs de LNA a monos verdes africanos. administrado por vía intravenosa en monos verdes africanos. administrado por vía intravenosa en monos verdes africanos. administrado por vía intravenosa en monos verdes africanos.
- Análisis de la captación de LNA-antimiR en hepatocitos y formación de heterodúplex con miR-122.
- Medición de los niveles de miR-122 y las concentraciones plasmáticas de colesterol.
- Examen histopatológico para la detección de toxicidades asociadas con el LNA.
Principales resultados:
- Antagonismo efectivo de la miR-122 expresada en el hígado en primates no humanos.
- Reducción dosis-dependiente en los niveles de colesterol en el plasma.
- Disminución duradera y reversible del colesterol total en el plasma.
- No hay evidencia de toxicidad asociada a LNA o cambios histopatológicos adversos.
Conclusiones:
- Los LNA-antimiR administrados sistémicamente son efectivos para el antagonismo de miRNA específico de la secuencia en primates.
- Los LNA-antimiR demuestran potencial como una nueva clase terapéutica para enfermedades relacionadas con el miRNA.
- Este estudio valida LNA-antimiRs para explorar la función de miRNA en todas las especies.
Videos de Conceptos Relacionados
MicroRNAs
MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
MicroRNAs
MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA ends...
MicroRNAs
MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA ends...
Experimental RNAi
RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
RNA Interference
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
siRNA - Small Interfering RNAs
Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
