Abstract: Anti-CD148 antibodies and antigen-binding regions thereof, as well as pharmaceutical compositions comprising such antibodies and antigen-binding regions, are described. Also described are methods of using such antibodies and antigen-binding regions to bind CD148 epitopes and activate CD148 function, such as inhibition of angiogenesis. Epitopes that can be used to activate CD148 function and anti-angiogenesis activity are also described, as well as methods of identifying compounds that can bind them.

Abstract: The present invention provides compositions and methods relating to anti-CD148 receptor antibodies. Methods provided include inhibiting angiogenesis and, thereby, vascularization of solid tumors in human patients. The present invention also provides compositions and methods for in vivo imaging of tumors expressing CD 148. Compositions of the invention include: anti-CD148 antibodies, antigen binding regions of anti-CD148 antibodies, polynucleotides encoding anti-CD148 antibodies or binding regions thereof, vectors comprising these polynucleotides, host cells, and pharmaceutical compositions. Methods of making and using each of these compositions is also provided.