The overall organizing hypothesis of this Program posits that bioactive sphingolipids function as important regulators of several key tumor cell attributes, including tumor initiation, differentiation, growth, apoptosis, senescence, inflammation, invasion, and metastasis. As a corollary, enzymes of sphingolipid metabolism are emerging as specific and novel targets in modulating these important cancer attributes. Unfortunately, the study of bioactive lipids is rife with complications, both conceptual and technical and thus the study of lipids necessitates the collaborative interactions of various disciplines and specialized cores. Thus, we have evolved 4 distinct projects that collaborate to investigate the overall hypothesis: Project 1 will address the specific hypothesis that acid sphingomyelinase defines a novel pathway of cancer cell biology involving two specific mediators, the chemokine RANTES and the cytokine IL6, with important roles in cancer inflammation and metastasis. Project 2 will test the specific hypothesis that alkaline ceramidase 1 acts as a tumor suppressor in non-melanoma skin cancers and its downregulation promotes skin tumorigenesis by stimulating hyperproliferation of epidermal keratinocytes. Project 3 will test the hypothesis that loss of Sphingosine Kinase 1 is a key event in mediating the tumor suppressor effects of P53, especially on the induction of senescence. Project 4 will test the hypothesis that BCR-ABL1 transcriptionally regulates SMS1 and that elevated SMS1 activity sustains the tumorigenic potential of BCR-ABL1 positive cells. These 4 projects will be supported by two unique research cores: The Lipidomics Core which will provide analytical and synthetic lipid chemistry, and by a Sphingolipid Animal Cancer Pathobiology Core that focuses on mutants/knock outs in enzymes of sphingolipid metabolism and models of in vivo carcinogenesis. This Program group has been highly integrated and productive and has advanced significantly our understanding of sphingolipids (one of the last frontiers of basic research) in caner biology and therapeutics. We are now poised to advance pre-clinical studies and translational research based on our understanding of these novel pathways. These studies continue to identify novel targets and strategies for cancer therapeutics.
The Program focuses on the study of novel molecules that derive from the metabolism of fat molecules present in the cell. We have been working on discovering these molecules, how they work, and what they do in the regulation of cancer cell growth, aging, and metastasis. We bring together 4 highly collaborative groups that work closely with each other with a primary focus on understanding the pathways that regulate these molecules and their functions in human cancer. We particularly aim at defining vulnerable points in these pathways as novel targets for the development of rational and new therapies. We have also developed two outstanding shared resources that support these projects and many other investigators across the nation: a lipid core focused on developing novel molecules and on measuring the various lipid molecules, and an animal pathobiology core that allows us to begin translating our novel results into specific human diseases.
|Chen, Jennifer Y; Newcomb, Benjamin; Zhou, Chan et al. (2017) Tricyclic Antidepressants Promote Ceramide Accumulation to Regulate Collagen Production in Human Hepatic Stellate Cells. Sci Rep 7:44867|
|Janecke, Andreas R; Xu, Ruijuan; Steichen-Gersdorf, Elisabeth et al. (2017) Deficiency of the sphingosine-1-phosphate lyase SGPL1 is associated with congenital nephrotic syndrome and congenital adrenal calcifications. Hum Mutat 38:365-372|
|Xu, Ruijuan; Garcia-Barros, Monica; Wen, Sally et al. (2017) Tumor suppressor p53 links ceramide metabolism to DNA damage response through alkaline ceramidase 2. Cell Death Differ :|
|Espaillat, Mel Pilar; Kew, Richard R; Obeid, Lina M (2017) Sphingolipids in neutrophil function and inflammatory responses: Mechanisms and implications for intestinal immunity and inflammation in ulcerative colitis. Adv Biol Regul 63:140-155|
|McCracken, A N; McMonigle, R J; Tessier, J et al. (2017) Phosphorylation of a constrained azacyclic FTY720 analog enhances anti-leukemic activity without inducing S1P receptor activation. Leukemia 31:669-677|
|Pulkoski-Gross, Michael J; Uys, Joachim D; Orr-Gandy, K Alexa et al. (2017) Novel sphingosine kinase-1 inhibitor, LCL351, reduces immune responses in murine DSS-induced colitis. Prostaglandins Other Lipid Mediat 130:47-56|
|Coant, Nicolas; Sakamoto, Wataru; Mao, Cungui et al. (2017) Ceramidases, roles in sphingolipid metabolism and in health and disease. Adv Biol Regul 63:122-131|
|Hernández-Corbacho, María José; Salama, Mohamed F; Canals, Daniel et al. (2017) Sphingolipids in mitochondria. Biochim Biophys Acta 1862:56-68|
|Bai, Aiping; Mao, Cungui; Jenkins, Russell W et al. (2017) Anticancer actions of lysosomally targeted inhibitor, LCL521, of acid ceramidase. PLoS One 12:e0177805|
|Lin, Chih-Li; Xu, Ruijuan; Yi, Jae Kyo et al. (2017) Alkaline Ceramidase 1 Protects Mice from Premature Hair Loss by Maintaining the Homeostasis of Hair Follicle Stem Cells. Stem Cell Reports 9:1488-1500|
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