Chemical control of protein stability and function in living mice.
Conditional control of protein function in vivo offers great potential for deconvoluting the roles of individual proteins in complicated systems. We recently developed a method in which a small protein domain, termed a destabilizing domain, confers instability to fusion protein partners in cultured cells. Instability is reversed when a cell-permeable small molecule binds this domain. Here we describe the use of this system to regulate protein function in living mammals. We show regulation of secreted proteins and their biological activity with conditional secretion of an immunomodulatory cytokine, resulting in tumor burden reduction in mouse models. Additionally, we use this approach to control the function of a specific protein after systemic delivery of the gene that encodes it to a tumor, suggesting uses for enhancing the specificity and efficacy of targeted gene-based therapies. This method represents a new strategy to regulate protein function in living organisms with a high level of control.
Banaszynski
Laura A
LA
Department of Chemistry, Radiology and Microbiology & Immunology, Stanford University, 318 Campus Drive, Stanford, California 94305, USA.
Sellmyer
Mark A
MA
Contag
Christopher H
CH
Wandless
Thomas J
TJ
Thorne
Steve H
SH
D000818:Animals; D045325:HCT116 Cells; D006801:Humans; D007376:Interleukin-2 / Q000378:metabolism; D051379:Mice; D016513:Mice, SCID; D009368:Neoplasm Transplantation; D009374:Neoplasms, Experimental / Q000188:drug therapy* / Q000276:immunology; D017434:Protein Structure, Tertiary; D022021:Tacrolimus Binding Proteins / Q000737:chemistry* / Q000502:physiology*; D014183:Transplantation, Heterologous; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism
D007376:Interleukin-2; D014409:Tumor Necrosis Factor-alpha; D022021:Tacrolimus Binding Proteins