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Related Concept Videos

Modified-Release Drug Delivery Systems: Site-Targeted01:24

Modified-Release Drug Delivery Systems: Site-Targeted

Site-targeted drug delivery systems enhance therapeutic efficacy while minimizing systemic toxicity and treatment costs. Unlike conventional methods, these systems ensure precise drug delivery, improving bioavailability and reducing side effects. Targeted drug delivery is classified into three levels. First-order targeting directs drugs to the capillary beds of specific organs or tissues. Second-order targets specific cell types, such as tumor cells, using receptor-mediated interactions.
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Carrier-Mediated Transport

Carrier-mediated transport is a pivotal process in drug absorption, particularly for lipid-insoluble drugs, and encompasses facilitated diffusion and active transport. Facilitated diffusion allows drugs to move along their concentration gradient without energy expenditure, while active transport utilizes ATP to drive drug movement against this gradient.
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Cellular Membranes and Drug Transport

Drugs must traverse multiple biological barriers, such as multi-layered skin, single-layered intestinal epithelium, and the plasma membrane, to reach their target sites within the body. The plasma membrane, a highly structured composite of phospholipids, carbohydrates, and proteins, is the cell's protective boundary, facilitating selective substance exchange.
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Site-Targeted Drug Delivery Systems: Polymeric Carriers

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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Drug Delivery: Parenteral Route

The parenteral route is a critical method of drug administration. It delivers compounds directly into the systemic circulation and bypasses the gastrointestinal tract. This approach is particularly advantageous for drugs that exhibit poor absorption or instability when administered orally.
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Regioselective Biolistic Targeting in Organotypic Brain Slices Using a Modified Gene Gun
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Programming Brain Cell-Type-Selective Delivery In Vivo with Transporter-Guided Therapeutics.

Roshan W Gunasekara, Lejie Zhang, Lei Tong

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    |June 29, 2026
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    Summary
    This summary is machine-generated.

    Researchers developed a novel platform for targeted drug delivery, ExACT (Exogenous Cellular Targeting), enabling precise intracellular delivery to specific cell types by leveraging natural cell transporters. This breakthrough promises enhanced therapeutic efficacy and reduced side effects for various diseases.

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    Area of Science:

    • Pharmacology
    • Cell Biology
    • Neuroscience

    Background:

    • Many diseases stem from specific cell population dysfunction.
    • Current therapeutics often lack cell-type specificity, leading to limited efficacy and increased toxicity.
    • Targeted intracellular delivery remains a significant challenge in pharmacotherapy.

    Purpose of the Study:

    • To develop a platform for cell-type-selective intracellular drug delivery.
    • To identify and utilize endogenous membrane transporters for targeted uptake.
    • To demonstrate the potential of this platform for precision pharmacotherapy.

    Main Methods:

    • Developed the ExACT (Exogenous Cellular Targeting) platform for cell-type-selective intracellular delivery.
    • Conducted in vivo screening of small-molecule libraries in mouse brains to identify transporter-mediated uptake.
    • Utilized humanized mouse models and human iPSC-derived cells to validate transporter selectivity.
    • Engineered neurons with ectopic transporter expression to create synthetic entry ports.
    • Created bifunctional conjugates linking transporter-targeting motifs to therapeutic payloads (ASOs, small molecules).

    Main Results:

    • Identified small molecules with preferential uptake in neurons, astrocytes, pericytes, and endothelial cells based on endogenous transporter expression.
    • Discovered a series of compounds with high selectivity for brain and retinal endothelium mediated by Slco1a4.
    • Demonstrated conserved selectivity of the human orthologue SLCO1A2 in humanized mouse models and human oligodendrocytes.
    • Showcased successful targeted delivery to gene-therapy-modified neurons expressing SLCO1A2.
    • Confirmed retention of pharmacological activity in bifunctional conjugates, achieving transporter-dependent cell-type selectivity.

    Conclusions:

    • The ExACT platform effectively achieves cell-type-selective intracellular delivery by exploiting membrane transporters.
    • Transporter diversity can be harnessed for precision pharmacotherapy, enabling targeted drug delivery to specific cell populations.
    • This approach holds significant potential for developing more effective and safer therapeutics with reduced off-target effects.