
Thomas Graeber
Professor, Molecular and Medical Pharmacology
About
Thomas Graeber is faculty in the Department of Molecular and Medical Pharmacology and a member of the Crump Institute for Molecular Imaging at UCLA, and is a Melanoma Research Alliance Established Investigator and an American Cancer Society Research Scholar. His background includes physics, cancer biology, signal transduction, metabolism, computational biology, proteomics, and metabolomics. His work builds experimental and computational approaches to studying cancer signaling and metabolism from a systems perspective. His work in cancer biology started with the discovery that hypoxia, a common feature of solid tumors, induces p53 protein levels, and that p53 deficient cells are less prone to undergo apoptosis in low oxygen conditions, conferring a survival advantage. These findings led to a model of hypoxia as a physiological selective force against apoptosis-competent cells in developing tumors, thus explaining the previously unaccounted for high frequency of p53 mutations in cancer. In computational biology, he developed an algorithm to identify potential autocrine signaling loops in cancer using gene expression microarray data. The algorithm integrates biological data (in this case, cognate ligand-receptor partners) into the analysis of raw gene expression data, and a number of leads from this method have been verified to play critical roles in cell signaling. His work in integrated signaling and metabolic networks has repeatedly pointed to the importance of negative and positive feedback loops in cancer phenotypes, and he is investigating approaches to therapeutically disrupting cancer-specific reliance on these feedback mechanisms.
Education and Degree(s)
- Ph.D.
Publications
- Graham NA, Tahmasian M, Kohli B, Komisopoulou E, Zhu M, Vivanco I, Teitell MA, Wu H, Ribas A, Lo RS, Mellinghoff IK, Mischel PS, Graeber TG. Glucose deprivation activates a metabolic and signaling amplification loop leading to cell death. Mol Syst Biol. 2012 Jun 26;8:589.
- Poulikakos PI, Persaud Y, Janakiraman M, Kong X, Ng C, Moriceau G, Shi H, Atefi M, Titz B, Gabay MT, Salton M, Dahlman KB, Tadi M, Wargo JA, Flaherty KT, Kelley MC, Misteli T, Chapman PB, Sosman JA, Graeber TG, Ribas A, Lo RS, Rosen N, Solit DB. RAF inhibitor resistance is mediated by dimerization of aberrantly spliced BRAF(V600E). Nature. 2011 Dec 15;480(7377):387-90.
- Rubbi L, Titz B, Brown L, Galvan E, Komisopoulou E, Chen SS, Low T, Tahmasian M, Skaggs B, Muschen M, Pellegrini M, Graeber TG. Global phosphoproteomics reveals crosstalk between Bcr-Abl and negative feedback mechanisms controlling Src signaling. Sci Signal. 2011 Mar 29;4(166):ra18.
- Fang C, Wang Y, Vu NT, Lin WY, Hsieh YT, Rubbi L, Phelps ME, Muschen M, Kim YM, Chatziioannou AF, Tseng HR, Graeber TG. Integrated microfluidic and imaging platform for a kinase activity radioassay to analyze minute patient cancer samples. Cancer Res. 2010 Nov 1;70(21):8299-308. Epub 2010 Sep 13
- Plaisier SB, Taschereau R, Wong JA, Graeber TG. Rank-rank hypergeometric overlap: identification of statistically significant overlap between gene-expression signatures. Nucleic Acids Res. 2010 Sep;38(17):e169. Epub 2010 Jul 21