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Related Concept Videos

Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

Site-Targeted Drug Delivery Systems: Polymeric Carriers

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Polymeric carriers enhance targeted drug delivery by increasing efficacy while minimizing off-target effects. These carriers comprise a biodegradable polymeric backbone integrated with functional elements that enable targeting, improve physicochemical properties, and regulate drug release.Targeting MechanismsThe targeting ability of polymeric carriers is mediated by a homing device, which is a molecular recognition component designed to selectively bind to specific tissues or cells. Monoclonal...
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siRNA - Small Interfering RNAs02:30

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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.
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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.
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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...
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Porous Silicon Microparticles for Delivery of siRNA Therapeutics
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Biodegradable Multiamine Polymeric Vector for siRNA Delivery.

Yuanyuan Yuan, Faming Gong, Yang Cao

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    |August 28, 2015
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    This summary is machine-generated.

    A novel biodegradable polymer vector effectively delivers small interfering RNA (siRNA) for cancer therapy. This new vector, unlike non-biodegradable options, shows promise for efficient gene silencing and cancer cell apoptosis induction.

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    Area of Science:

    • Biomaterials Science
    • Nanotechnology
    • Molecular Biology

    Background:

    • Small interfering RNA (siRNA) holds therapeutic potential for diseases but requires efficient and safe delivery vectors.
    • Poly(ethylenimine) (PEI) is a promising nucleic acid vector, yet its non-biodegradability limits clinical use.
    • Developing biodegradable vectors with high siRNA delivery efficiency and low toxicity is crucial for therapeutic applications.

    Purpose of the Study:

    • To synthesize and characterize a novel biodegradable diblock copolymer for efficient siRNA delivery.
    • To evaluate the copolymer's potential as a non-PEI based vector for cancer therapy.
    • To demonstrate the vector's ability to mediate gene silencing, induce apoptosis, and inhibit cancer cell growth.

    Main Methods:

    • Synthesis of a PEG-PAsp(DIP-DETA) diblock copolymer via ring-opening polymerization and aminolysis.
    • Characterization of the copolymer's multiamine structure and proton buffering capacity.
    • In vitro evaluation of siRNA complexation, cellular uptake, gene silencing, and cancer cell growth inhibition.

    Main Results:

    • The synthesized PEG-PAsp(DIP-DETA) copolymer effectively complexes siRNA at neutral pH and facilitates endosomal escape via proton buffering.
    • The poly(L-aspartic acid) backbone provides biodegradability, addressing a key limitation of PEI.
    • Intracellular delivery of BCL-2 siRNA using the novel vector led to significant gene silencing, apoptosis, and cancer cell growth inhibition.

    Conclusions:

    • The novel diblock copolymer PEG-PAsp(DIP-DETA) represents a promising, biodegradable alternative to PEI for siRNA delivery.
    • This vector exhibits efficient proton buffering and biodegradability, crucial for safe and effective nucleic acid therapeutics.
    • The demonstrated efficacy in cancer cells highlights its potential for developing advanced siRNA-based cancer therapies.