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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.
Cellular Membranes and Drug Transport01:24

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.
Phospholipids arrange themselves into a bilayer, with hydrophilic heads oriented outward and hydrophobic tails facing inward.
Modified-Release Drug Delivery Systems: Overview01:19

Modified-Release Drug Delivery Systems: Overview

Modified-release dosage forms are designed to address the limitations of drugs with short biological half-lives. These forms maintain stable therapeutic drug concentrations over extended periods, reducing the need for frequent dosing. A consistent drug level helps minimize peak-trough fluctuations, which can reduce adverse effects, lower the risk of drug resistance, and improve overall treatment effectiveness.One common type of modified-release form is the extended-release (ER) formulation. ER...
Mechanisms of Drug Absorption: Paracellular, Transcellular, and Vesicular Transport01:23

Mechanisms of Drug Absorption: Paracellular, Transcellular, and Vesicular Transport

Drugs need to permeate cell membranes to reach their target sites after administration. Orally administered drugs must transcend intestinal epithelial membrane barriers to infiltrate the systemic circulation. Drugs with a molecular weight of less than 500 Daltons diffuse through gaps between neighboring cells, called paracellular pathways.
However, most drugs use the transcellular route, traversing directly through the cell membranes via two mechanisms: passive and active transport. Passive...
Drug Delivery: Overview01:16

Drug Delivery: Overview

The selection of a drug's delivery route depends upon its physicochemical properties, including lipid or water solubility and ionization, as well as the therapeutic requirement, such as immediate or sustained effect. These routes can be divided into three primary categories: enteral, parenteral, and topical.
Enteral delivery involves administering drugs directly through swallowing, sublingual placement, or buccal application. Orally administered drugs predominantly navigate the gastrointestinal...
Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

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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Targeted Plasma Membrane Delivery of a Hydrophobic Cargo Encapsulated in a Liquid Crystal Nanoparticle Carrier
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Cell-mediated drug delivery.

Elena V Batrakova1, Howard E Gendelman, Alexander V Kabanov

  • 1Center for Drug Delivery and Nanomedicine, Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, NE 68198-5830, USA. ebatrako@unmc.edu

Expert Opinion on Drug Delivery
|February 26, 2011
PubMed
Summary

Immune cells (immunocytes) can be engineered as Trojan horses for targeted drug delivery, improving treatment efficacy for various diseases while minimizing toxicity. This cell-mediated approach enhances drug transport and circulation times.

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Targeted Plasma Membrane Delivery of a Hydrophobic Cargo Encapsulated in a Liquid Crystal Nanoparticle Carrier
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Area of Science:

  • Pharmaceutical Sciences
  • Immunology
  • Nanotechnology

Background:

  • Effective drug delivery aims to target sites of injury, tumors, or infection with minimal toxicity.
  • Immunocytes, such as phagocytes and lymphocytes, are mobile and can migrate across barriers to deliver drugs.
  • Exploiting immunocytes as Trojan horses offers a promising strategy for targeted drug delivery.

Purpose of the Study:

  • To review the use of drug-laden immunocytes for treating diseases.
  • To explore the potential of cell-mediated drug delivery across blood-brain and blood-tumor barriers.
  • To discuss the advantages and challenges of using immunocytes for therapeutic purposes.

Main Methods:

  • Literature review of cell-mediated drug delivery strategies.
  • Analysis of immunocyte migration and drug release mechanisms.
  • Examination of therapeutic applications in infectious diseases, cancer, and inflammatory conditions.

Main Results:

  • Cell-mediated drug delivery facilitates transport across critical biological barriers.
  • Immunocytes enhance drug targeting, prolong circulation, and reduce toxicity.
  • Harnessing immunocytes can improve therapeutic outcomes in various disorders.

Conclusions:

  • Cellular drug delivery vehicles offer targeted transport and prolonged circulation.
  • This strategy represents a novel approach to combating a range of human diseases.
  • Designing nanocarriers for cell-mediated delivery may require different approaches than conventional systems, opening new avenues for active drug delivery.