密度-速度关系在上皮单层中是尺度依赖的.
Hengdong Lu1, Tianxiang Ma1, Amin Doostmohammadi1
1Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, Copenhagen 2100, Denmark. doostmohammadi@nbi.ku.dk.
Soft matter
|January 27, 2026
概括
细胞运动速度以尺度依赖的方式取决于密度. 起初,更高的密度会增加速度,但超出典型的长度尺度,增加拥挤会抑制细胞速度.
科学领域:
- 细胞生物学 细胞生物学
- 生物物理学的生物物理.
- 软物质物理学 软物质物理学
背景情况:
- 细胞密度和速度之间的关系是复杂的,一些研究表明负相关性 (拥挤抑制运动),而另一些则是积极的 (密集区域显示增强活动).
- 相互矛盾的观察表明,细胞密度和迁移之间的相互作用尚未完全理解,可能取决于规模或系统特性.
研究的目的:
- 为了研究细胞密度和表皮单层中速度之间的尺度依赖关系.
- 通过识别潜在的机制,调和对密度调节细胞迁移的相互矛盾观点.
主要方法:
- 在多个空间窗口上使用粗粒度测量细胞运动的实验测量.
- 引力显微镜用于评估细胞所施加的机械力.
- 开发一个最小的生物物理模型,包括活动诱导的细胞形状变化.
主要成果:
- 细胞速度大小与小空间尺度上的局部密度正相关.
- 在更大的尺度上观察到交叉,其中细胞速度与局部密度成负相关.
- 这种依赖尺度的行为恰逢机械压力分离的出现,并定义了特有的长度尺度.
结论:
- 表皮单层中的密度-速度关系本质上是尺度依赖的,挑战了简单的负相关性假设.
- 一个特有的长度尺度出现,超出了机械限制和拥挤效应主导了局部密度驱动的活动.
- 这些发现通过突出主动力产生和机械束之间的相互作用作为集体细胞动态的关键调节者来协调相互矛盾的理论.
相关概念视频
Relative Velocity in Two Dimensions
9.1K
Relative velocity is the velocity of an object as observed from a particular reference frame, or the velocity of one reference frame with respect to another reference frame. The concept of relative velocity can be used to describe motion in two dimensions. Consider a particle P and two reference frames S and S′. The position of the origin of S′ as measured in S is , the position of P as measured in S′ is , and the position of P as measured in S is , which can be evaluated by utilizing...
9.1K
Relative Velocity in One Dimension
10.1K
The understanding of the concept of reference frames is essential to discuss relative motion in one or more dimensions. When we say that an object has a certain velocity, we must state the velocity with respect to a given reference frame. In most examples, this reference frame has been Earth. For instance, if a statement reads that a person is sitting in a train moving at 10 m/s east, then it implies that the person on the train is moving relative to the surface of Earth at this velocity,...
10.1K
Relative Motion Analysis - Velocity
726
A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
726
Contact-dependent Signaling
46.9K
Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
In animal cells, gap junctions are formed...
Gap Junctions
In animal cells, gap junctions are formed...
46.9K
pH Scale
79.4K
Hydronium and hydroxide ions are present both in pure water and in all aqueous solutions, and their concentrations are inversely proportional as determined by the ion product of water (Kw). The concentrations of these ions in a solution are often critical determinants of the solution’s properties and the chemical behaviors of its other solutes. Two different solutions can differ in their hydronium or hydroxide ion concentrations by a million, billion, or even trillion times. A common means of...
79.4K
Average Velocity
22.9K
To calculate the other physical quantities in kinematics, we must introduce the time variable. The time variable allows us not only to state the position of the object during its motion, but also how fast it is moving. The speed at which an object is moving is given by the rate at which the position changes with time. For each position xi, we assign a particular time ti. If the details of the motion at each instant are not important, the rate is usually expressed as the average velocity. This...
22.9K


