Cell Sequence and Mitosis Affect Fibroblast Directional Decision-Making During Chemotaxis in Microfluidic Mazes

Fibroblast movement is vital in tissue repair and development. Yet, how individual fibroblasts influence each other's direction during chemotaxis remains unclear. Prior research has shown that fibroblasts respond to chemoattractant gradients. But this work explores how interactions within confined spaces affect directional choices. Classical models assume cells follow global gradients. However, recent studies suggest local factors may override global cues. This gap motivated investigating microfluidic environments. No prior work had resolved how cell sequence and division affect path selection. The study addresses this by observing fibroblasts in mazes. It proposes that local PDGF-BB consumption alters expected behaviors.

This study aimed to examine how fibroblasts modify each other's migration paths in microfluidic mazes. The specific problem is understanding how cell sequence and mitosis influence directional decisions. The motivation stems from gaps in classical chemotaxis theory. The research focuses on PDGF-BB-induced migration in confined spaces. The study tests whether local consumption affects path selection. It also explores how daughter cells choose opposite directions after division. The goal is to reveal mechanisms beyond global gradient models. These findings could improve engineered tissue design.

The researchers used microfluidic mazes to study fibroblast migration. The mazes had two paths: short with steeper gradients and long with weaker gradients. Platelet-derived growth factor-BB (PDGF-BB) was used as a chemoattractant. Image-based modeling simulated PDGF-BB diffusion, consumption, and decay. Cell sequence effects were observed by tracking leading and following cells. Mitosis effects were analyzed by monitoring daughter cell directions. The study compared expected and observed path choices. Data collection included tracking cell movement and chemoattractant distribution.

Cells often chose opposite paths when facing a bifurcation. Leading cells took the steeper gradient path. Following cells then selected the weaker gradient path. This alternation contradicted global gradient expectations. Image modeling suggested local PDGF-BB consumption caused this. Daughter cells from mitosis moved in opposite directions. They migrated against the chemoattractant gradient. This occurred even with on-going cell traffic. The findings show local interactions override global cues. The results challenge classical chemotaxis assumptions.

The authors suggest that local PDGF-BB consumption affects directional decisions. Cell sequence and mitosis influence path selection in unexpected ways. These effects are not captured by classical chemotaxis models. The findings imply that fibroblasts modify each other's behavior in confined spaces. This could improve understanding of tissue generation in vivo. It may also enhance engineered tissue products in vitro. The study proposes that local interactions are critical. These insights could inform future tissue engineering strategies.