Associate Professor Scott Mueller

Scott is internationally recognised for his work on T cell responses to viral infections, and his work on the biology of lymphoid stromal cells during infection. He has led the development of a confocal and in vivo 2-photon imaging facility in the Department of Microbiology and Immunology. Scott is now recognised as a leader in the field of intravital imaging to study the immune system.

Priming of T Cell responses to viral infection

Much of our understanding of the complex series of events that occur during the priming of immune responses to infections or following vaccination have been gained via static methods such as flow cytometry, histology and cell culture. These methods provide limited information on when, where and how different cells interact during the different phases of immunity. Scott’s group now has the ability to follow immune cells within living tissues and animals to determine their behaviour in real time using intravital 2-photon microscopy. A major goal is to understand how T cells are activated in response to viral infections. T cells (both CD4+ and CD8+) are first activated in draining lymph nodes via interactions with dendritic cells (DC) presenting viral antigens. Using well-established models of localised or systemic viral infection, they are directly examining T cell responses by 2-photon microscopy in the skin, lymph nodes and spleen. They have assembled an array of powerful tools, including recombinant viruses and transgenic mice expressing fluorescent molecules in various compartments.Much of our understanding of the complex series of events that occur during the priming of immune responses to infections or following vaccination have been gained via static methods such as flow cytometry, histology and cell culture. These methods provide limited information on when, where and how different cells interact during the different phases of immunity. Scott’s group now has the ability to follow immune cells within living tissues and animals to determine their behaviour in real time using intravital 2-photon microscopy. A major goal is to understand how T cells are activated in response to viral infections. T cells (both CD4+ and CD8+) are first activated in draining lymph nodes via interactions with dendritic cells (DC) presenting viral antigens. Using well-established models of localised or systemic viral infection, they are directly examining T cell responses by 2-photon microscopy in the skin, lymph nodes and spleen. They have assembled an array of powerful tools, including recombinant viruses and transgenic mice expressing fluorescent molecules in various compartments.
Tissue-resident memory T cells in the skin

Protection from viral infections that target peripheral tissues such as the skin requires coordinated recruitment of pathogen-specific T lymphocytes into the tissue where they function to defeat the virus. Following the resolution of HSV-1 infection or inflammation in the skin, tissue-resident memory (Trm) CD8+ T cells reside for long periods in the epidermis where they can provide enhanced protection from reinfection. These tissue-resident T cells display a unique dendritic morphology and a slow pattern of tissue surveillance. Scott’s group is examining how these Trm cells are formed, persist and respond following secondary infection.
Nervous regulation of T cell migration and anti-viral immunity

The lymphoid organs are innervated by fibres of the sympathetic nervous system (SNS), which release SNS neurotransmitters during times of chronic stress. SNS neurotransmitters bind to beta-adrenoceptors (βARs) on multiple cell types to induce genomic and functional changes. However, little is known about the impact of SNS neurotransmitters on immune cell function or their role in anti-viral immunity. Studies have shown that viral immunity is compromised during times of chronic stress raising the possibility that SNS signalling impairs anti-viral immunity by impacting T cell activation, migration or effector functions. This project is examining the effect of adrenergic receptor signalling in T cells on their migration within tissues such as the lymph nodes and subsequent immune responses to viral infections.
Lymphoid stromal cell responses to infection

The lymphoid tissues (spleen and lymph nodes) are constructed of a complex microarchitecture that is supported by networks of endothelial and mesenchymal stromal cells. The T cell zones in the spleen and lymph nodes are supported by a network of stromal cells known as fibroblastic reticular cells (FRC). Little is known of the phenotype of these stromal cell subsets and how they can influence the immune cells they regularly interact with. Scott’s group is examining how FRC contribute to the expansion and contraction of secondary lymphoid organs during immune responses to acute and chronic viral infections, as well as following recall infection. The phenotypic changes that occur in the secondary lymphoid organ stromal cells after infection will reveal how FRC function changes and whether pathogens can differentially influence the functions of these critical cells and how this influences immunity.
T cell responses during experimental malaria infection

T cells play key roles in protection against Plasmodium berghei infection. The mechanisms underlying T cell activation in the spleen and migration to the brain where they can cause disease are not well understood. To address this, Scott’s group have developed a novel system to image the brain in live animals undergoing malarial infection using 2-photon laser scanning microscopy. This allows temporal assessment of the immune response occurring in the brain. Using tools including TCR transgenic mice generated by the Heath group, they are examining the role of malaria-specific CD8 T cells in disease.

Mueller Group

Research in Scott’s group is focused on examining immune responses to both acute and chronic viral infections. A particular emphasis on T cell responses and interactions with antigen presenting cells and lymphoid tissue stromal cells is currently driving the group, as well as an interest in neuro-immune interactions.

Lab Team
- Dr Yannick Alexandre
  
  Post-Doc
- Dr Sapna Devi
  
  Research Officer
- Jyh Liang Hor
  
  PhD Student
- Keit Loi
  
  PhD student
- Dr Gayle Davey
  
  Senior Research Officer
- Dr Claerwen Jones
  
  Senior Research Officer
- Yu (Alex) Kato
  
  PhD student (co-supervised with Heath Lab)
- Melanie Damtsis
  
  Research Assistant
- Ming Li
  
  Research Assistant
- Dana Piovesan

Associate Professor Scott Mueller

Associate Professor Scott Mueller

Mueller Group

Lab Team