Cell Memory Under Pressure: Mechanotransduction, Chromatin Remodeling and Therapeutic Prospects with Sarah Wickstrom

Summary

The Naked Scientists speak with Sarah Wickstrom about how cells detect physical forces and translate them into changes in gene activity through chromatin remodeling. The discussion covers how mechanical stress at the cell surface triggers signaling to the nucleus, reshapes chromatin, and can create a memory of prior insults that affects future responses. The conversation touches on development, cancer invasion, and fibrotic disease, and explores therapeutic angles including how memory could be erased or redirected using chromatin modifiers. Wickstrom also shares her personal journey, awards, and what comes next for memory in tissue biology.

• Mechanosensing begins at the plasma membrane through mechanosensitive ion channels.
• Stress signals are conveyed to chromatin, altering gene expression and cell behavior.
• Forces influence development and pathogenic states such as cancer and fibrosis.
• Therapeutic potential lies in targeting chromatin readers and writers to rewrite cellular memories.

Overview

The podcast features a detailed interview with Sarah Wickstrom, director at the Max Planck Institute for Molecular Biomedicine, about how cells sense mechanical forces and translate those cues into lasting changes in gene expression through chromatin remodeling. The conversation situates these mechanisms within development, cancer biology, and potential clinical applications, including memory recall in the nucleus and possibilities for erasing maladaptive memories.

From Sensing to Memory: The Core Mechanism

The discussion begins with the idea that tissues experience constant mechanical forces, from skin contact to vascular shear and muscle stretch. Ion channels at the cell surface can be gated by stretch, initiating electrical and chemical signals that are relayed to the nucleus. Wickstrom emphasizes that it is not just a single signaling pathway that changes cell fate; rather, a broad reorganization of the chromatin structure reshapes which genes are accessible to transcription factors. This remodeling allows rapid, robust responses to mechanical cues, enabling cells to adapt to their environment. In developing embryos, such forces provide positional information that helps cells decide between becoming skin, muscle, or heart tissues, illustrating how mechanics complement chemical signals in guiding development.

Chromatin Remodeling and Genomewide Reprogramming

A key insight is that the response to mechanical stress can involve widespread changes to chromatin accessibility. The chromatin remodeling is not limited to a handful of genes; instead, the entire genome can shift toward a state that favors or suppresses broad classes of genes. Wickstrom explains that this makes the response fast and integrated, but also makes it harder to target with drugs compared to pathways regulating a single gene. The remodeling process can, in principle, be memory of previous stress: if a tissue experiences a certain mechanical history, its chromatin landscape may carry traces that alter future responses to similar stimuli.

Implications for Health and Disease

In cancer, cells can become insensitive to normal mechanical cues that restrain growth, and the mechanical environment of a growing tumor can push cancer cells toward more aggressive phenotypes. Wickstrom suggests the memory-like chromatin states could help explain how tumors adapt to changing forces during progression. In development, force-driven cues act as a co-signal with chemical signals to ensure proper tissue patterning, while in disease such as fibrosis, persistent mechanical stress could drive maladaptive remodeling that stiffens tissue and impairs function.

Memory, Biomarkers and Therapeutic Avenues

The potential to identify memory genes as biomarkers is discussed, along with the possibility of rewriting memories by targeting chromatin readers and writers. Bromodomain inhibitors, which affect epigenetic regulation, are highlighted as a class of drugs that could inform how memory is controlled, although their broad actions may complicate precise control of memory states. Wickstrom emphasizes the goal of translating these findings into diagnostics and interventions for diseases where mechanical memory contributes to pathology.

Beyond the Bench: Personal Journey and Future Directions