From iPSC-Macrophage Biology Towards Regenerative Therapies Targeting Respiratory Infections

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Tissue resident macrophages (TRMs) can be found in various organs and fulfil important functions in host defence and tissue homeostasis. Recent studies in the murine system suggest profound tissue plasticity and self-renewal capacity of TRMs, rendering this cell population highly suitable for new cell-based therapies. Mycobacterial infections represent a serious health problem, for which new therapies are highly needed. Given the important role of alveolar macrophages (MΦs) in pulmonary host defence, I propose a cutting-edge MΦ based therapy using induced pluripotent stem cell (iPSC) technology. The unique features of iPSC will allow to investigate important regulators for the development and regenerative potential of human MΦs with the overall aim to apply these cells as an innovative treatment for pulmonary (non)tuberculous mycobacterial infections. I go beyond current knowledge and envision to enhance or exchange the endogenous alveolar MΦ cell pool by iPSC-MΦs, thereby introducing a completely new cell therapy concept. This ground-breaking cell transfer concept will have broad application potential to combat life threatening infectious diseases of the lower respiratory tract and may even be expanded to Mycobacterium tuberculosis infections. Using different knock-out iPSC lines, I will unravel important regulators for the regenerative potential of iPSC-MΦs following intra-pulmonary transfer. State-of the-art genome editing will be combined with innovative single cell RNAseq tools to understand and enhance the regenerative properties of human iPSC-MΦs. Using established cell depletion and cell transfer techniques, I will decipher the therapeutic potential of mature human iPSC-derived MΦ in vitro and in vivo using humanized mouse models and pre-clinical mycobacterial infections scenarios. The iPSC2Therapy proposal will provide an innovative anti-mycobacterial treatment with broad implications to infectious diseases and beyond.