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Abstract <p>In the world of cellular dynamics, adaptability is paramount. Cells, embedded in constantly changing environments, have evolved mechanisms to detect and respond to both internal and external forces. These adaptive responses, shaped by natural selection, allow cells to maintain function and structural integrity amid shifting conditions. This delicate task hinges upon the coordinated involvement of specialized adhesion proteins strategically positioned at sites where cells attach to their extracellular matrix or neighbouring cells. These proteins serve as the sentinel gatekeepers of an intricate signalling network, activated by their environment. Once triggered, certain signaling cascades initiate a sequence of events that can lead to significant changes in the structure and organization of the actin cytoskeleton—a dynamic scaffold within the cell. These specific signals enable precise rearrangement of actin, supporting processes like cell movement and adaptation to environmental cues. This metamorphosis is coordinated primarily through the action of actin polymerization—a process through which actin protein subunits align and fuse, generating new filaments or enhancing existing ones. However, the significance of this process is magnified by the fact that the collective force generated by the actin network exceeds the simple sum of forces exerted by individual filaments. In this context, force refers to the mechanical push or pull exerted by actin filaments on cellular membranes or other structures, driving processes like cell movement and shape changes. A cooperative phenomenon thus emerges, where these individual forces coalesce, giving rise to a cumulative force that stands as a testament to the synergy of the system. In this mini review article, we go straight into the interactions between actin polymerization and force generation, un-ravelling the detailed mechanisms that explain this synergy. This article provides new insights into the molecular mechanism of actin polymerization, highlighting recent discoveries in how specific signaling pathways interconnect and the unique role of adhesion proteins in orchestrating this process.</p>

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Actin Polymerization: Mechanistic Insights into Cellular Adaptation Processes

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • Neelabh Datta

摘要

Abstract

In the world of cellular dynamics, adaptability is paramount. Cells, embedded in constantly changing environments, have evolved mechanisms to detect and respond to both internal and external forces. These adaptive responses, shaped by natural selection, allow cells to maintain function and structural integrity amid shifting conditions. This delicate task hinges upon the coordinated involvement of specialized adhesion proteins strategically positioned at sites where cells attach to their extracellular matrix or neighbouring cells. These proteins serve as the sentinel gatekeepers of an intricate signalling network, activated by their environment. Once triggered, certain signaling cascades initiate a sequence of events that can lead to significant changes in the structure and organization of the actin cytoskeleton—a dynamic scaffold within the cell. These specific signals enable precise rearrangement of actin, supporting processes like cell movement and adaptation to environmental cues. This metamorphosis is coordinated primarily through the action of actin polymerization—a process through which actin protein subunits align and fuse, generating new filaments or enhancing existing ones. However, the significance of this process is magnified by the fact that the collective force generated by the actin network exceeds the simple sum of forces exerted by individual filaments. In this context, force refers to the mechanical push or pull exerted by actin filaments on cellular membranes or other structures, driving processes like cell movement and shape changes. A cooperative phenomenon thus emerges, where these individual forces coalesce, giving rise to a cumulative force that stands as a testament to the synergy of the system. In this mini review article, we go straight into the interactions between actin polymerization and force generation, un-ravelling the detailed mechanisms that explain this synergy. This article provides new insights into the molecular mechanism of actin polymerization, highlighting recent discoveries in how specific signaling pathways interconnect and the unique role of adhesion proteins in orchestrating this process.