Tissue memory relies on stem cell priming in distal undamaged areas

Area of Science:

• Stem cell biology
• Tissue regeneration
• Epigenetics

Background:

• Epithelial cells develop enhanced responses to future injuries after wound repair, a phenomenon traditionally considered localized.
• The spatial extent and cellular mechanisms underlying this 'wound memory' are not fully understood.

Purpose of the Study:

• To investigate the spatial impact of localized tissue damage on cell adaptation and wound memory.
• To identify the specific cell populations and mechanisms responsible for long-lasting wound memory.
• To explore the consequences of wound memory on subsequent tissue repair and tumorigenesis.

Main Methods:

• Analysis of stem cell populations distant from the initial injury site.
• Assessment of chromatin and transcriptional changes in memory cells.
• Epigenetic perturbation studies to mimic memory cell states.
• Evaluation of tumor development in the context of wound memory.

Main Results:

• Localized injury induces a wide-ranging spatial adaptation, impacting distant stem cells.
• A distinct stem cell population, not involved in the initial healing, forms long-lasting 'wound memory progenitors' in a separate niche.
• These memory cells are intrinsically pre-activated via priming, maintaining a specific chromatin and transcriptional state.
• This pre-activated state enhances future wound repair and, importantly, exacerbates tumorigenesis, establishing an 'epigenetic field cancerization.'

Conclusions:

• Sub-organ-scale adaptation to injury involves spatially organized, memory-dedicated progenitors with an actionable cell state.
• Wound memory, mediated by epigenetically primed progenitors, enhances repair but carries long-term risks, including increased susceptibility to cancer.
• The study reveals a novel mechanism of injury adaptation with significant implications for regenerative medicine and cancer research.