Engineering function in lung biology: integrating imaging, regenerative constructs, and functional biodesign.

The lung is a uniquely demanding target for regeneration because its function depends on the coordinated integration of cellular diversity, three-dimensional architecture, cyclic mechanical forces, vascular perfusion, immune surveillance, and extracellular matrix remodeling. Although single-cell and spatial profiling, lineage tracing, and induced pluripotent stem cell (iPSC)-derived models have transformed our understanding of lung cell states and developmental potential, these descriptive approaches have also highlighted a central bottleneck: the field still lacks broadly adopted platforms to test whether engineered tissues and regenerative interventions restore "function" under physiological load. In this review, we focus on emerging technologies that enable functional biodesign in the lung biology by coupling engineered constructs to measurement systems that approximate native mechanics, flow, and immune dynamics. We highlight lung-scale experimental systems including engineered whole lung scaffolds, and we examine dynamic imaging platforms, exemplified by crystal ribcage approaches, that allow us to quantify alveolar mechanics, capillary perfusion, immune-cell behavior, and matrix remodeling in real time. We then discuss regenerative constructs as design problems defined by region-specific constraints and disease-associated transitional states, and we survey cell-based, molecular, and subcellular interventions that shift repair strategies from replacement toward targeted functional augmentation. Finally, we draw lessons from medical device translation, durability, infection resistance, and mechanical integrity, as nonnegotiable benchmarks for regenerative success. Together, these platforms establish an evidence framework, in which lung regeneration is evaluated by physiological performance rather than inferred from molecular or structural endpoints, accelerating progress from descriptive biology to reproducible, clinically actionable repair.