Fu, Zheng John""
Associate Professor, Pharmacology
- BS, Molecular Biology, NanKai University, Tianjin, P. R. China
- PhD, Cell and Developmental Biology, University of Florida, Gainesville, FL
Biochemistry, Cancer Biology, Cell and Developmental Biology
Signaling mechanism of protein kinases in development and disease
My broad research interest is the molecular and cellular basis of human disease, with a focus on aberrant signal transduction of protein kinases and phosphorylation. Protein kinases comprise one of the largest and most abundant gene families in humans. Both inherited germ-line and somatic mutations in kinase genes have been associated with many human diseases. Research in my lab is currently focused on the signaling mechanism and pathophysiologic functions of ciliogenesis associated kinase 1 (CILK1), formerly known as intestinal cell kinase (ICK). CILK1/ICK is a highly conserved serine/threonine protein kinase that restricts cilia biogenesis and cilia length. We are using both in vitro cell model systems and in vivo transgenic mouse models and a wide spectrum of experimental approaches in the areas of biochemistry, cell and developmental biology, and cancer biology to address the role of CILK1/ICK in development, ciliopathies, tissue injury repair and regeneration, and colon cancer/drug resistance.
Project 1: Elucidate the molecular basis of CILK1 dysfunction in human ciliopathies
CILK1 is an essential gene in development. Loss-of-function mutations in human CILK1 gene are associated with ciliopathies such as human ECO (endocrine-cerebral-osteodysplasia) syndrome. A major research focus in my lab is to elucidate the cellular and molecular basis underlying the developmental defects that lead to the perinatal lethality phenotype of ECO ciliopathy using Cilk1 mutant knock-in mouse models.
Project 2: Elucidate the role of ICK in intestinal epithelial injury repair and regeneration
ICK localizes specifically in the intestinal crypt where intestinal stem and progenitor cells reside. In vitro, we have demonstrated that ICK is important for intestinal epithelial cell proliferation and survival. Given that ICK expression is strongly induced in the intestine following radiation injury or malnutrition, we are using an intestine-specific Ick knockout mouse model to interrogate the role of ICK in intestinal epithelial injury repair and regeneration and restoration of intestinal epithelial integrity following radiation injury or malnutrition.
Project 3: Investigate a novel ICK-GSK3 signaling mechanism in Colon Cancer and Drug Resistance
A major challenge in current cancer therapy is the development of drug-resistance over time as a result of unexpected complexities in biological responses to drug treatment, such as compensatory and feed-back regulatory effects. Combinatory inhibition of multiple signaling pathways has emerged as an effective therapeutic strategy for the long-term cancer treatment. Developing novel targets toward key signaling molecules that inter-connect between synergistic or compensatory signaling cascades thus becomes essential for the combination therapy. Another major focus in the lab is to understand the biological significance of ICK over-expression in human colon cancer specimens and the oncogenic role of a newly-identified ICK-GSK3 signaling axis in CRC and rapamycin-resistance.