First time at Proteopedia? Click on the green links: they change the 3D image. Click and drag the molecules. Proteopedia is a 3D, interactive encyclopedia of proteins, RNA, DNA and other molecules. With a free user account, you can edit pages in Proteopedia. Visit the Main Page to learn more.
Molecular Playground/Targeting Peptide
The RGD peptide is a popular peptide targeting motif used in experimental, nanoscale drug delivery vehicles (such as liposomes, micelles, dendrimers, nanoparticles, etc.) The RGD peptide binds specifically with cell adhesion molecules on the cell surface. Upregulation/overexpression of cell surface markers (such as this integrin) on certain kinds of cancer cells leads to selective accumulation of nanomaterial drug carriers within cancerous tissues, and targeted delivery of their payloads (drugs, contrast agents for imaging, etc.). Shown is the cyclic analogue of the RGD peptide complexed with alpha 5 Integrin.
Targeted Drug Delivery
Drugs are exogenous compounds administered to organisms to generate therapeutic effects. However, drugs exhibit complex and, often, unintended side effects. Targeted drug delivery systems can ameliorate the problem of drug toxicity by concentrating drugs exclusively at sites of their intended activity. Furthermore, targeted drug vehicles can deliver molecules (DNA/RNA) with known therapeutic value, but which, by themselves, are incapable of reaching tissues and cells in their therapeutic form. Aided by the vast knowledge of biological systems made available over the last fifty years by discoveries in the fields of Molecular Biology, Genomics, Biochemistry, and Physiology, advances in Materials Science hold great promise in bringing about a pharmacological revolution.
I am very grateful to NIH Chemistry-Biology Interface (CBI) Training Program, whose funding has made this work possible.