While nanoparticles are emerging as drug carriers for targeted nanomedicines, preclinical assays to test nanoparticle efficacy are hampered by the lack of methods to quantitatively determine internalized particles. A novel method is suited to pave the way for preclinical testing of nanoparticles to establish dose-efficacy relationships and to optimize biophysical and biochemical parameters in order to make better drug delivery vehicles. The team demonstrated that it is possible to determine the exact number of nanoparticles inside a cell through a combination of three methods and a mathematical model which they developed to link the data from these three methods.
Under an applied magnetic field, iron oxide nanoparticles trigger cancer cell death by bursting intracellular organelles. These findings offer a new strategy to treat cancer using nanomaterials. Researchers may be able to administer magnetic nanoparticles externally, allow them to accumulate at the tumor site, and then irradiate them with a magnetic field to induce cancer cell death. In the past, antibodies and small molecules were used to trigger apoptosis in cancer cells. However, cancer cells often adapt to resist these treatments. Because iron oxide nanoparticles cause physical damage to cancer cells, it is difficult for them to develop resistance.
Fractals are structures built up from repeated sizings of a simple shape to make a complex one. A fractal is a geometric structure that can repeat itself towards infinity. Zooming in on a fragment of it, the original structure becomes visible again. In biological systems, fractal structures can be found everywhere - bronchial trees, vasculature, and nerve cells. These amazing structures can provide a specific interfacial contact mode that is highly efficient for absorbing sunlight, transporting nutrition, exchanging oxygen and carbon dioxide, and signal transduction. Researchers have now demonstrated the fabrication of programmable fractal gold nanostructured interfaces and their outstanding specific recognition of rare cancer cells from whole blood samples along with their effective release capability.
Nanomaterials hold promise as synthetic vaccines. They have the ability to deliver cargo to specific immune cells and modulate the resulting immune response. Compared to natural vaccine vectors, including engineered viruses or attenuated pathogens, synthetic nanoscale vaccines are safer, more controlled, and have the potential to be more effective. Nanoscale vaccines may also prevent, or even treat a wider range of diseases, including cancer. Researchers now have developed nanoscale polymer micelles that elicit both humoral and cellular immunity. The constructs could help in the fight against infectious diseases and cancer.
Nanotechnology is helping to revolutionize cancer hyperthermia - the treatment of cancer with heat. Certain types of nanoparticles, in particular those made of gold or iron oxide, act as transducers that absorb electromagnetic radiation and generate heat. If the nanoparticles are delivered selectively to a tumour, heat can be generated within the tumour tissue by irradiating it with an external energy source. This results in heat-induced cell death within the tumor, sparing the surrounding healthy tissues. Researchers have now developed gold nanoparticles coated with a temperature-sensitive dye. The constructs allow nanoparticle-induced heating to be monitored locally.
Scientists used a new type of biocompatible nanoparticle known as a 'porphysome' to detect and demarcate prostate tumors as small as 2mm in size. The tumors were imaged using a combination of positron emission tomography (PET) and optical imaging. PET allows doctors to detect, localize, and characterize prostate tumors non-invasively, while optical imaging allows them to find the edges of the tumor(s) during treatment. The porphysomes were also able to detect cancerous cells that had metastasized (spread) to the bone. This may allow doctors to find and treat cancer that has spread from the prostate to other parts of the body.
Carbon nanomaterials such as nanotubes or graphene not only are widely researched for their potential uses in industrial applications, they also are of great interest to biomedical engineers working on nanotechnology applications. These researchers found that incorporating carbon-based nanomaterials is effective not only as injectable nanoscale devices but also as components to enhance the function of existing biomaterials significantly. A recent article highlights different types of carbon-based nanomaterials currently used in biomedical applications.
Computed tomography (CT) scans are an imaging method that use x-rays to create pictures of cross-sections of the body. Many CT scans involve intravenously injected iodinated contrast agents - but they have drawbacks such as fast clearance and side effects. Due to these limitations, nano-sized iodinated CT contrast agents have been developed that can increase the circulation time and decrease the adverse effects. In addition to iodine, nanoparticles based on heavy atoms such as gold, lanthanides, and tantalum are used as more efficient CT contrast agents.