Welcome! You have reached the homepage for the laboratory of Dr. Bryan Heit. Our lab is part of the Department of Microbiology and Immunology at Western University, and we are members of the Center for Human Immunology, the lead centre for the CIHR Human Immunology Network.
Our interests surround the function of phagocytes – white blood cells which ingest (phagocytose) pathogens, particles, and dead cells. We focus on the cellular and molecular processes which control the function of these cells during the maintenance of homeostasis, infection and chronic inflammatory disease. Central to most of our studies is the study of efferoctyosis – the phagocytic removal of apoptotic (dying) cells, and how failures in this process lead to inflammation, autoimmunity and infection.
Phagocytes are a class of white blood cells which have the capacity to engulf large particles such as bacterial and fungal pathogens, and subsequently destroy the engulfed material. The term phagocyte literally translates to “cell that eats”, which is an apt description of the primary function of these cells in our bodies. While there are many types of phagocytes, the Heit lab focuses primarily on macrophages, which play key roles in both maintaining our bodies and in fighting infections.
We use a combination of advanced microscopy techniques, gene expression analysis and functional assays to investigate the activity of macrophages. Some examples of the methods we employ can be found on our YouTube channel.
We would like to thank NVIDIA and their GPU Grant Program for awarding the Heit lab a free GPU for our computational work. This program furnishes academic labs with free GPU’s, for use in developing new analytical frameworks and to enable data analysis. This NVIDIA GPU will allow the Heit lab to continue our development of the next generation of image analysis routines, building upon or MIiSR and SPT frameworks. In addition, this GPU will increase our capacity to engage in SRRF super-resolution imaging.
Programs such as these are critical for the on-going development of new image analysis methods, and to ensure that all labs can utilise leading-edge computational technologies. We at the Heit lab are looking forward to receiving this GPU and for the work it will enable in our lab.
The Heit lab is recruiting a new PhD student, to start in either May or September of 2019. This student will explore the changes in macrophage gene expression and function which occur early in atherosclerosis, thus probing the biological processes which initiate this devastating disease. This is a patient-centred project, which will make extensive use of patient samples and human-derived cells. The student taking on this project will develop expertise in the biology of macrophages and atherosclerosis, develop advanced skills in functional, live cell and super-resolution microscopy, and learn a variety of molecular and cell biology techniques. The skills and knowledge learned in this project will be applicable to a range of academic, governmental and industrial careers. This PhD position is fully funded for the first two years.
The successful applicant will be highly motivated and a self-directed learner. Prior molecular biology and microscopy experience is an asset, but it not required. Applicants should have a BSc (or equivalent) in one of: cell biology, biochemistry, immunology, or a related field. Please ensure that you meet the Admission Requirements for the Department of Microbiology and Immunology at the University of Western Ontario prior to applying. This position is open to domestic (Canadian) and international applicants; international applicants should confirm that they qualify for entry into Canada prior to applying for this position.
To apply for this position send Dr. Heit an email containing:
If you have already been accepted into the Microbiology & Immunology graduate program and are searching for a supervisor, please send me an email informing my that you’ve been accepted into the program and are interested in this position. The cover letter, grades and CV are not required in this situation.
Applications missing this information will not be considered.
One of the best parts of science is bringing new techniques and technologies into your lab. Our newest technique is SRRF imaging, which can more than double the resolution of nearly any widefield microscope, and can even be employed on living samples. The improvement this technology adds can be seen in the images of bovine aortic epithelial cells on the left, which have been stained for actin (yellow), DNA (cyan) and mitochondria (magenta).
SRRF imaging uses a specialised deconvolution approach which relies on the mapping of radial symmetry to resolve the positions of fluorophores with high precision. This process is repeated over a number of frames (10-100), with the convergence of signals between images used to refine fluorophore positions and non-convergence used to remove noise. The result is a dramatic improvement in both resolution and signal-to-noise ratios.
This amazing advance in microscopy was made possible by the work and free NanoJ plug-in for ImageJ/FIJI produced by Ricardo Henriques’s group at University College, UK. SRRF imaging will soon be available to approved users via our widefield core.
Additional papers and resources on SRRF Imaging: