# Cytoskeletal prestress homeostasis is a biological principle that governs living cell structure and function

## TL;DR

This paper argues that cytoskeletal prestress homeostasis is a fundamental biological principle that governs cell structure and function, going beyond physical laws.

## Contribution

The paper proposes cytoskeletal prestress homeostasis as a new biological principle essential for living cells.

## Key findings

- Cytoskeletal prestress regulation is essential for cell structure and function.
- Cytoskeletal prestress homeostasis is proposed as a unique biological principle of living cells.
- Understanding biological principles can lead to better therapeutic interventions for human health.

## Abstract

Over the last few decades, physical principles have been proposed to explain some biological processes and functions. However, biological principles remain elusive. A biological principle is a governing rule that guides the structure and functions of cells. Biological principles are built upon the laws of physics and chemistry, but they go beyond these laws and are unique to living matter. Here, we discuss what differentiates a biological principle from a physical principle and discuss candidates for biological principles. We review evidence from literature that regulation of cytoskeletal prestress (endogenous cytoskeletal pre-existing tensile stress) is essential for governing biological structures and functions of living cells. We propose that, in addition to the biological principles of Central Dogma and metabolism, cytoskeletal prestress homeostasis is a biological principle of a living cell across all domains of life. We propose that living cells regulate their stress and modulus to limit maximum strain on the cells. Homeostasis of endogenous energy-dependent, stress-supported systems that use cytoskeletal (CSK) prestress (the force of life) to stabilize structure represents a biological principle of a living cell that is not observed in inorganic systems, whereas other basic principles (e.g., self-assembly) are required for living systems but are also found in simpler nonliving systems. Leveraging biological principles of cells may have far-reaching implications in understanding the essence of cell life and designing effective interventions for therapeutics to advance medicine and enhance human health.

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•This review presents evidence that cytoskeletal prestress is critical for the structure and functions of living cells.•This review proposes that cytoskeletal prestress homeostasis is a biological principle governing cell structure and function.•Biological principles that are built upon but go beyond physical and chemical principles are the keys to advancing human health.

This review presents evidence that cytoskeletal prestress is critical for the structure and functions of living cells.

This review proposes that cytoskeletal prestress homeostasis is a biological principle governing cell structure and function.

Biological principles that are built upon but go beyond physical and chemical principles are the keys to advancing human health.