Targeted Ligand Delivery
Targeted Ligand Delivery - Related Videos
03:36
Pretargeted Radioimmunotherapy: A Method for Targeted Delivery of Therapeutic Radionuclides to Tumors
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2023
This video describes the technique of pretargeted radioimmunotherapy or PRIT, in which immunoconjugates followed by radioligands are administered for treating tumors. This radioimmunotherapy reduces radiation doses to healthy tissues and utilizes radionuclides with very low half-lives incompatible with antibody-based vectors.
05:50
Pharmacophore Modeling for Targets with Extensive Ligand Libraries: A Case Study on SARS-CoV-2 Mpro
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2025
This article presents a protocol for constructing a consensus pharmacophore model by integrating molecular features from multiple ligands. This method is applicable to drug discovery efforts targeting any biological target with known ligand-bound conformations, enabling the identification of key interaction features for virtual screening and rational drug design.
02:40
Ligand Binding Sites
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2020
Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands. Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
02:51
Metal-Ligand Bonds
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2020
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes. In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
00:49
Ligand Binding and Linkage
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2020
Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence the...
FAQs
Selectivity arises when the chosen ligand binds a matching receptor on the surface of intended cells. Cells lacking that receptor are less likely to bind and accumulate the ligand-guided cargo. This molecular recognition can concentrate a therapeutic or imaging agent in receptor-bearing cells, helping distinguish target cells from surrounding non-target tissues.
Binding can initiate receptor-mediated endocytosis, a process in which the cell takes the receptor and associated ligand-cargo complex inward. This step can move a payload beyond the cell surface and into the intracellular environment. Consequently, targeted ligand delivery may influence not only where cargo accumulates, but also whether it reaches an internal cellular location.
The targeted strategy uses selective ligand-receptor recognition to favor cargo accumulation in cells displaying the matching receptor. Nonspecific distribution does not rely on that same molecular address and may expose more non-target tissue. The distinction matters because receptor-guided localization can support cellular specificity while potentially reducing unnecessary exposure outside the intended cell population.
A basic design workflow identifies a receptor on the intended cell type, selects a ligand that binds that receptor, and links or associates the ligand with the therapeutic, imaging agent, or other cargo. Researchers then examine receptor binding, cellular accumulation, and, where relevant, internalization to determine whether the system directs the payload as intended.
Researchers may use this approach when they need to direct a therapeutic or imaging agent toward cells defined by a matching surface receptor. It can support targeted therapy and molecular imaging while also providing a way to study receptor function and intracellular trafficking. These applications connect molecular recognition with measurable cargo distribution and activity.
Observed cargo accumulation and internalization can provide evidence about how a receptor recognizes its ligand and how the resulting complex moves through a cell. In biology research, the method therefore helps investigate receptor function, intracellular trafficking, and the relationship between molecular recognition and therapeutic-agent distribution. The same observations can inform delivery-system performance.