Hanselmann Rainer G, Welter Cornelius
Institute of Human Genetics, Saarland UniversityHomburg, Germany; Beratungszentrum für HygieneFreiburg, Germany.
Institute of Human Genetics, Saarland University Homburg, Germany.
Front Cell Dev Biol. 2016 Nov 17;4:121. doi: 10.3389/fcell.2016.00121. eCollection 2016.
Cells are open, highly ordered systems that are far away from equilibrium. For this reason, the first function of any cell is to prevent the permanent threat of disintegration that is described by thermodynamic laws and to preserve highly ordered cell characteristics such as structures, the cell cycle, or metabolism. In this context, three basic categories play a central role: energy, information, and matter. Each of these three categories is equally important to the cell and they are reciprocally dependent. We therefore suggest that energy loss (e.g., through impaired mitochondria) or disturbance of information (e.g., through mutations or aneuploidy) or changes in the composition or distribution of matter (e.g., through micro-environmental changes or toxic agents) can irreversibly disturb molecular mechanisms, leading to increased local entropy of cellular functions and structures. In terms of physics, changes to these normally highly ordered reaction probabilities lead to a state that is irreversibly biologically imbalanced, but that is thermodynamically more stable. This primary change-independent of the initiator-now provokes and drives a complex interplay between the availability of energy, the composition, and distribution of matter and increasing information disturbance that is dependent upon reactions that try to overcome or stabilize this intracellular, irreversible disorder described by entropy. Because a return to the original ordered state is not possible for thermodynamic reasons, the cells either die or else they persist in a metastable state. In the latter case, they enter into a self-driven adaptive and evolutionary process that generates a progression of disordered cells and that results in a broad spectrum of progeny with different characteristics. Possibly, 1 day, one of these cells will show an autonomous and aggressive behavior-it will be a cancer cell.
细胞是开放的、高度有序的系统,处于远离平衡的状态。因此,任何细胞的首要功能是防止热力学定律所描述的解体的永久威胁,并维持高度有序的细胞特征,如结构、细胞周期或新陈代谢。在这种情况下,三个基本类别起着核心作用:能量、信息和物质。这三个类别对细胞同样重要,且相互依存。因此,我们认为能量损失(例如通过线粒体功能受损)、信息干扰(例如通过突变或非整倍体)或物质组成或分布的变化(例如通过微环境变化或有毒物质)会不可逆地干扰分子机制,导致细胞功能和结构的局部熵增加。从物理学角度来看,这些通常高度有序的反应概率的变化会导致一种状态,这种状态在生物学上是不可逆的失衡,但在热力学上更稳定。这种与引发因素无关的初始变化,现在引发并驱动了能量可用性、物质组成和分布以及不断增加的信息干扰之间的复杂相互作用,这种信息干扰取决于试图克服或稳定这种由熵描述的细胞内不可逆紊乱的反应。由于热力学原因,细胞不可能恢复到原来的有序状态,因此细胞要么死亡,要么处于亚稳态。在后一种情况下,它们进入一个自我驱动 的适应性和进化过程,产生一系列无序细胞,并导致具有不同特征的广泛后代。也许有一天,这些细胞中的一个会表现出自主和侵袭性的行为——它将成为一个癌细胞。