Technology Bundle ID
NCI-E-136-2019

SMAD3 Reporter Mouse for Assessing TGF-ß/Activin Pathway Activation

Applications
Research Materials
Lead Inventors
Lalage Wakefield (NCI)
Co-Inventors
Caroline Hill ()
Sushil Rane (NIDDH)
Yuan Yang (NCI)
Development Status
Pre-clinical (in vivo)
ICs
NCI

The Transforming Growth Factor Beta (TGF-ß) ligands (i.e., TGF-ß1, -ß2, -ß3) are key regulatory proteins in animal physiology. Disruption of normal TGF-ß signaling is associated with many diseases from cancer to fibrosis. In mice and humans, TGF-ß activates TGF-ß receptors (e.g., TGFBR1), which activates SMAD proteins that alter gene expression and contribute to tumorigenesis.  Reliable animal models are essential for the study of TGF-ß signaling. A previously developed animal model for TGF-ß signaling utilizes a luciferase expression system under the control of SMAD protein responsive promoter elements (Lin et al., 2005, J. Immunol). The luciferase-based reporter mouse requires administering luciferin for bioluminescence detection. Another previously developed model is a SMAD protein-responsive, green fluorescent protein (GFP)-based reporter mouse (Neptune et al., 2003, Nat. Genet.); however, the model is no longer available. Thus, there remains a need for novel reporter animal models to study TGF-ß signaling.

NCI investigators designed an enhanced GFP (eGFP)-based reporter construct that is more sensitive to SMAD3 activation than other existing reporter constructs. Expression of eGFP is driven by an artificial enhancer element consisting of six repeats of a strong SMAD3 binding element. This reporter was greater than ten times more sensitive in vitro than the CAGA12-based reporter, another commonly used construct to detect TGF-ß signaling.  Using CRISPR/Cas9 technology, the inventors knocked this reporter construct into the Rosa26 locus, a ubiquitously expressed gene in most cells of the mouse. This strategy allows identification of tissues and cells in which signaling of TGF-βs are endogenously active during normal development, tissue homeostasis, and disease.

The mouse model is currently undergoing further validation using genetic and pharmacological approaches. It is available for licensing.

Commercial Applications
  • Development of oncology therapeutics
  • Developing of fibrosis therapeutics
  • Pre-clinical in vivo model to study TGF-β signaling and pathway antagonists
  • Pre-clinical model for TGF-β/SMAD3 disease states
Competitive Advantages
  • No requirement for luciferin injections
  • Higher sensitivity for SMAD3 activation than other reporters

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