"We believe that this peptide has great potential for becoming a new, effective imaging and therapeutic agent for patients with lymphoid cancers," said Kit Lam, professor and chief of hematology and oncology at UC Davis Cancer Center and senior author of the paper.
The peptide named LLP2A by Lam binds to a receptor found on the surface of lymphocytes. In the Nature Chemical Biology paper, Lam reports that LLP2A is attracted specifically to malignant lymphocytes, not healthy ones.
The next step will be to evaluate the binding of LLP2A in a larger number of human lymphoma biopsy samples. If those results are positive, Lam plans to test the peptide as a lymphoma imaging agent in patients. Experiments are already under way at the UC Davis School of Veterinary Medicine to evaluate LLP2A in dogs with naturally occurring non-Hodgkin's lymphoma. In addition, Lam and his colleagues have begun testing the peptide as a drug-delivery vehicle for lymphoma tumors in mice.
LLP2A is intended to work like a monoclonal antibody but a peptide is much smaller than an antibody and has the potential to infiltrate cancer cells more successfully. Monoclonal antibodies, engineered to lock onto a specific target molecule, are used to carry radioactive isotopes or anti-cancer drugs directly to a tumor. Three monoclonal antibodies, rituximab (Rituxan), ibritumomab tiuxetan (Zevalin), and tositumomab (Bexxar), have already been approved by the Food and Drug Administration for the treatment of B-cell lymphoma. These antibodies have drawbacks, however: They bind to healthy lymphocytes along with malignant ones; in addi
Contact: Claudia Morain
University of California, Davis - Health System