Daniel Greenspan

Credentials: PhD

Position title: Professor

Email: dsgreens@wisc.edu

Phone: (608) 262-4676

K4/430 CSC
600 Highland Avenue
Madison, WI 53792

Focus Groups

Cancer Biology

Signal Transduction


PhD, New York University

Research Summary

Extracellular modulators of cellular behaviors in development, homeostasis, and disease

Research Detail

Our focus has been on genes and gene products important to vertebrate development and human disease. We have previously discovered a number of developmentally important genes, and determined their involvement in normal morphogenesis and in genetic abnormalities. For, example, we were involved in isolating and characterizing the locus for the disfiguring and ultimately fatal heritable skin disorder dystrophic epidermolysis bullosa. We’ve also found and helped characterize the locus for classic Ehlers-Danlos syndrome, which occurs in about 1 in 20,000 births and produces individuals with fragile connective tissues.

Much work in the lab currently focuses on extracellular regulatory proteins that control and orchestrate events as diverse as growth factor signaling and formation of the extracellular matrix (ECM). Such events are critical in adult vertebrates (e.g. for maintenance of the cardiovascular system, wound healing, turnover of the skeleton and synaptic plasticity) and are even more dynamic during development. One class of the regulatory molecules that we study comprises small families of proteases that activate and inactivate various growth factors, enzymes and extracellular structural macromolecules. An example is the BMP1/Tolloid-like family of proteinases (see the Figure, below). Another class comprises antagonists of signaling by members of the TGFb superfamily of growth factors. Three additional classes of regulatory molecules under study modify actions of the first two by as yet unclear mechanisms. Molecules we study play central roles in morphogenetic processes and defects in these proteins may underlie human disease. Our studies employ biochemical, genetic and developmental analyses, including characterizing standard and conditional “knockout” mice, and zebrafish and examining possible links between defects in genes of interest and human development and disease.

Current studies in the lab also include roles of extracellular proteins in adipocyte biology, diabetic symptoms, atherosclerosis, and organ transplant rejection. The latter two studies include translational studies of human patients. roteins for in vitro and cell culture assays of protein function; high throughput screens for protein:protein interactions; the production and characterization of standard and conditional “knockout” mice that have altered alleles for the genes of interest, and examination of possible links between defects in the genes we study and human developmental abnormalities.

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