Retained Extracellular Matrix Changes After Transient Profibrotic Exposure: A Feasibility Framework for Investigating Tumour Susceptibility

This conceptual research framework proposes a staged investigation of extracellular matrix changes retained after transient profibrotic exposure and their effects on previously unexposed mammary epithelial cells. The proposed design distinguishes two intervals: the period between stimulus withdrawal and matrix collection, during which producer cells remain present, and the acellular retention period before recipient-cell introduction. Matrix characterization is combined with assessment of residual TGF-β activity, processing effects and epithelial responses under common culture conditions. A factorial comparison evaluates whether an intervention on an established candidate matrix property, performed before introducing recipient cells, selectively attenuates the effect associated with exposure history. The framework distinguishes retained biochemical signals, structural or mechanical contributions, continued producer-cell activity and persistence subsequently acquired by recipient cells. The manuscript includes three tables covering selected experimental evidence, the principal experimental groups, and expected outcomes with interpretation criteria. It builds on published decellularized-matrix and mechanobiology studies, including a close precedent using matrix from TGF-β1-activated mammary fibroblasts. Its proposed contribution concerns temporal resolution and causal attribution, rather than introducing matrix transfer as a new method. The initial endpoint concerns epithelial organization and polarity. Potential relevance to tumour susceptibility is discussed as a subsequent research question requiring transformation-specific evidence. Changes in proliferation, migration or signalling are not treated as proof of tumour initiation. This document reports no original experimental results. It is a conceptual research proposal, not a validated laboratory protocol, diagnostic method or therapeutic recommendation. Experimental conditions and analytical procedures require laboratory validation before confirmatory testing.