Implications of Cellular Mechanical Memory in Bioengineering.

Area of Science:

• Bioengineering
• Cell Biology
• Biomaterials Science

Background:

• Cell culture on stiff substrates induces mechanical stress, leading to persistent phenotypic changes in cells.
• This phenomenon, termed "mechanical memory," affects cell behavior even after transfer to new environments.
• Mechanical memory was first observed in pulmonary fibroblasts cultured on stiff substrates.

Purpose of the Study:

• To review the mechanisms underlying stiffness-induced mechanical memory in cells.
• To discuss the impact of mechanical memory on cell expansion and tissue regeneration in bioengineering.
• To propose alternative culture substrates for mitigating mechanical memory.

Main Methods:

• Review of existing literature on cellular mechanical memory.
• Analysis of cytoskeleton, transcription factor, and epigenetic modifier roles.
• Examination of bioengineering applications affected by mechanical memory.

Main Results:

• Stiffness-induced mechanical memory involves structural changes in the cytoskeleton and altered transcription factor/epigenetic modifier activity.
• Mechanical memory negatively impacts cell expansion and tissue regeneration in applications like stem cell therapies and disease models.
• Prolonged 2D plastic culture exacerbates the effects of mechanical memory.

Conclusions:

• Mechanical memory poses a significant challenge in cell-based bioengineering applications.
• Alternative cell culture substrates can potentially mitigate or erase mechanical memory.
• Overcoming mechanical memory is crucial for enhancing the efficiency of downstream bioengineering applications.