Related Experiment Video
Updated: Jul 10, 2026
09:06
Intra-lymph Node Injection of Biodegradable Polymer Particles
Published on: January 2, 2014
Delivery systems for immunomodulatory proteins and peptides
1Department of Pediatrics and Adolescent Medicine, Mayo Clinic, Rochester, Minnesota, USA.
Summary
Drug delivery systems enhance the effectiveness of protein and polypeptide immunomodulators. Various carriers, including liposomes and engineered cells, improve immune system interactions and therapeutic outcomes.
Area of Science:
- Immunology
- Biotechnology
- Drug Delivery Systems
Background:
- Polypeptide and protein immunomodulators face challenges with absorption, biodistribution, metabolism, and degradation, limiting their effectiveness.
- Drug carrier technology offers solutions to overcome these limitations and improve therapeutic interactions.
Purpose of the Study:
- To explore various drug delivery systems for enhancing the immunomodulatory potential of polypeptides and proteins.
- To review methods for improving the delivery and efficacy of immunomodulatory agents.
Main Methods:
- Utilizing liposomes to increase delivery of immunomodulators to lymphatic tissues and macrophages.
- Employing polypeptides for enhanced immunostimulation, oral delivery, and depot effects.
- Investigating biodegradable carriers like polysaccharide microspheres.
- Developing genetically engineered bacteria, viruses, and mammalian cells as delivery vehicles.
- Using attenuated Salmonella strains for targeted delivery to lymphoid tissues, liver, and spleen.
- Employing tumor cells engineered to produce granulocyte-macrophage colony-stimulating factor (GM-CSF) to elicit immune responses.
Main Results:
- Liposome-associated Interleukin-2 (IL-2) demonstrates reduced toxicity and enhanced immunotherapeutic effects in preclinical models and human trials.
- Aerosol delivery of liposomal immunomodulators is effective for lung targeting.
- Polysaccharide microspheres serve as effective biodegradable carriers.
- Genetically engineered bacteria and cells successfully deliver immunomodulators to specific tissues.
- GM-CSF-producing tumor cells induce potent cell-mediated immune responses, including tumor elimination and memory responses.
Conclusions:
- Drug delivery systems significantly enhance the immunomodulatory potential of polypeptides and proteins.
- Liposomes, engineered cells, and microspheres are promising platforms for immunomodulator delivery.
- Targeted delivery strategies can improve therapeutic efficacy and reduce toxicity of immunomodulatory agents.
Related Concept Videos
01:28Parenteral Drug Delivery Systems: Injectables, Implants, and Infusion Devices
Parenteral drug delivery systems play a crucial role in modern therapeutics by enabling the direct administration of drugs into the systemic circulation, bypassing the gastrointestinal tract. These systems are particularly valuable for poorly absorbed oral medications that are unstable in the digestive environment or require rapid onset or sustained therapeutic levels. Delivery is achieved through intravenous, intramuscular, or subcutaneous routes, each selected based on the drug's properties...
01:24Site-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...
01:24Modified-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.
01:29Drug 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.
There are three primary parenteral routes: intravenous (IV), intramuscular (IM), and subcutaneous (SC). The IV route introduces the drug directly into the bloodstream, ensuring immediate action. The IM route...
There are three primary parenteral routes: intravenous (IV), intramuscular (IM), and subcutaneous (SC). The IV route introduces the drug directly into the bloodstream, ensuring immediate action. The IM route...
01:25Routes of Drug Administration: Parenteral
The administration of drugs via parenteral routes allows for direct drug introduction into the systemic circulation, resulting in high bioavailability because the medication bypasses the harsh conditions of the gastrointestinal tract and hepatic metabolism.
The intravenous route (IV) of drug administration can be further categorized into two types. The bolus injection administers the entire dose rapidly, while an intravenous infusion slowly delivers smaller doses steadily.
The IV route is often...
The intravenous route (IV) of drug administration can be further categorized into two types. The bolus injection administers the entire dose rapidly, while an intravenous infusion slowly delivers smaller doses steadily.
The IV route is often...
01:27Drug Delivery Systems: Different Types
Conventional oral drug products, termed immediate-release (IR) formulations, are engineered to promptly release their active pharmaceutical ingredient (API) upon ingestion, typically in tablets or capsules. This rapid release often results in swift drug absorption and consequent pharmacodynamic effects, although the timing and intensity can vary depending on the drug's properties. Prodrugs within these formulations require metabolic conversion to activate their pharmacodynamic effects,...