Molecular pathways in cardiac development

This programme of work is a close collaboration between myself and Dr Bill Chaudhry. To date, the research has centred on determining the embryological and molecular mechanisms that underlie cardiac development, focussing on the outflow tract of the heart. These mechanisms are frequently disrupted to result in congenital heart defects. Using a range of mouse mutants, we have established both that proper polarisation of neural crest and second heart field cells is critical for outflow development, and that the non-canonical Wnt, planar cell polarity (PCP), signalling pathway is crucial to this process. This signalling pathway appears to be unique in the extent to which different components have been shown to be essential to outflow tract development; our hypothesis that the PCP pathway signalling is critical has recently been confirmed by several other groups. As we progress with these studies we are beginning to confirm our data in human material.

Experience gained over the past 10 years has placed us in an enviable position with respect to further unravelling the mechanisms underlying outflow tract formation, septation and remodelling. We have a range of mouse models with mutations in different polarity genes and their downstream effectors. Recently (led by Dr Bill Chaudhry), we have also established the zebrafish as a model system for studying the early stages and functional aspects of cardiac development. Together with studies utilising cardiac and embryonic stem cell lines, we thus have a range of tools available for analysing the importance of cell polarity in cardiac development. We have long term collaborations with scientists studying PCP signalling in other developmental systems and with groups studying other aspects of cardiac development.

Our core research activities use transgenic and knock out mice to investigate the role of Wnt signalling pathways in cardiac malformation. We have long standing expertise in these approaches and we are making our own transgenic mice in order to address specific issues. Expertise in mouse cardiac developmental morphology and gene expression are inherent with this approach. Our early studies have focussed on the upstream components of the planar cell polarity pathway (Vangl2, Scrib). This has now expanded to incorporate potential downstream effectors of this pathway, including RhoA, ROCK, Rac and JNK, which regulate key developmental processes such as migration, proliferation and cell death. Thus, we are beginning to understand the complex relationship between gene expression patterns, cell behaviour (e.g. shape, adhesive properties, proliferation, death, differentiation, migration) and the shaping (morphogenesis) of specific cardiac structures. Further unravelling these complex relationships during development, and relating them to regeneration of the damaged adult heart, are our future goals.
Robert Anderson BSc, MD, FRCPath, FESC, FECTS
Visiting Professor
Alina Andras, BSC, PhD
Newcastle Hospitals Trust JRE Research Associate
Michael Baker
Newcastle University
PhD Student
Veronica Boczonadi BSc, MSc
BHF Research Associate
Bill Chaudhry MB BS MRCP PhD
Senior Lecturer in Biophysics and Cardiac Development
Nicholas Child MB BS MRCP
BHF Clinical Research Training Fellowship
Darren Hoyland BSc, PhD
BHF Research Assistant
Tania Papoutsi BSc
BHF PhD Student
Helen Phillips BSc, PhD
Newcastle University Faculty of Medical Sciences Fellow
Hong Jun Rhee BSc, PhD
BHF Research Associate