The antibody bevacizumab (Avastin) has been used clinically to treat intraocular neovascular diseases based on its antivascular endothelial growth factor (VEGF) character. The anti-VEGF strategy for retinal neovascular diseases is limited by the short half-life of bevacizumab and thus requires frequent injections. This Article reports the sustained release of bevacizumab from a biocompatible material that is composed of a triblock copolymer of poly(2-ethyl-2-oxazoline)-b-poly(ε-caprolactone)-b-poly(2-ethyl-2-oxazoline) (PEOz-PCL-PEOz). The amphiphilic PEOz-PCL-PEOz triblock copolymer was synthesized in three steps. First, the PEOz was polymerized by methyl p-toluenesulfonate and 2-ethyl-2-oxazoline (EOz), and the living end was terminated by potassium hydroxide methanolic solution. Subsequently, the hydroxyl-PEOz was used as a macroinitiator for the ring-opening polymerization of ε-caprolactone using a Tin(II) octoate catalyst to synthesize the telechelic hydroxylated PEOz-PCL. Finally, the PEOz-PCL-PEOz ...
The successful applicability of gene therapy approaches will heavily rely on the development of efficient and safe nonviral gene delivery vectors, for example, cell-penetrating peptides (CPPs). CPPs can condense oligonucleotides and plasmid DNA (pDNA) into nanoparticles, thus allowing the t ... more
Dendrimers feature a defined number of terminal groups that may bind RNA or be functionalized with bioactive molecules. These competing uses of terminal groups may create an impasse if the requisite density of ligands depletes the number of terminal groups for binding sufficient RNA, or vic ... more
The development of clay bionanocomposites requires processing routes with nanostructural control. Moreover, moisture durability is a concern with water-soluble biopolymers. Here, oriented bionanocomposite coatings with strong in-plane orientation of clay platelets are for the first time pre ... more
Scientists are reporting discovery of a potential biochemical basis for the apparent cancer-fighting ability of broccoli and its veggie cousins. They found for the first time that certain substances in the vegetables appear to target and block a defective gene associated with cancer. Their ... more
Scientists in Japan are reporting development of a faster, less expensive version of the fabled polymerase chain reaction (PCR) a DNA test widely used in criminal investigations, disease diagnosis, biological research and other applications. The new method could lead to expanded use of PCR ... more
Researchers at Rice University in Texas have developed a new approach to fighting cancer, based on nanoscale particles that can both detect and destroy cancerous cells. The report appears in the American Chemical Society's journal Nano Letters. Current molecular imaging approaches only dete ... more