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Protein-bound paclitaxel, also known as nanoparticle albumin–bound paclitaxel or nab-paclitaxel, is an injectable formulation of paclitaxel used to treat breast cancer, lung cancer and pancreatic cancer, among others. Paclitaxel kills cancer cells by preventing the normal breakdown of microtubules during cell division.
Albumin-bound paclitaxel (brand name Abraxane, also called nab-paclitaxel) is an alternative formulation where paclitaxel is bound to albumin nanoparticles. Much of the clinical toxicity of paclitaxel is associated with the solvent Cremophor EL in which it is dissolved for delivery.
The bound portion may act as a reservoir or depot from which the drug is slowly released as the unbound form. Since the unbound form is being metabolized and/or excreted from the body, the bound fraction will be released in order to maintain equilibrium. Since albumin is alkalotic, acidic and neutral drugs will primarily bind to albumin.
Once injected into the patient's body, the albumin nanoparticles can cross the BBB more easily, bind to the proteins and penetrate glioma cells, and then release the contained drugs. This nanoparticle formulation enhances tumor-targeting delivery efficiency and improves the solubility issue of hydrophobic drugs. [ 18 ]
Microtubules are composed of two globular protein subunits, α- and β-tubulin. These two subunits combine to form an α,β-heterodimer which then assembles in a filamentous tube-shaped structure. The tubulin hetero-dimers arrange themselves in a head to tail manner with the α-subunit of one dimer coming in contact with the β-subunit of the ...
Simple blood tests are also available for dose optimization of methotrexate, [32] 5-FU, paclitaxel, and docetaxel. [33] [34] The serum albumin level immediately prior to chemotherapy administration is an independent prognostic predictor of survival in various cancer types. [35]
In other cases, topical is defined as applied to a localized area of the body or to the surface of a body part regardless of the location of the effect. [4] [5] By this definition, topical administration also includes transdermal application, where the substance is administered onto the skin but is absorbed into the body to attain systemic ...
The most promising drug delivery system is using nanoparticle delivery systems, these are systems where the drug is bound to a nanoparticle capable of traversing the blood–brain barrier. The most promising compound for the nanoparticles is Human Serum Albumin (HSA).