arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2104.13694q-bio.CBphysics.bio-phphysics.comp-ph
收藏

在肿瘤生长的空速恒温动力学理论模型中免疫系统细胞数的振荡

Oscillations of the number of immune system cells in a space-velocity thermostatted kinetic theory model of tumor growth

Léon Masurel, Carlo Bianca, Annie Lemarchand

摘要:

在恒温动力学理论的框架内,在细胞尺度上描述了在非均匀条件下癌细胞和免疫系统细胞之间的竞争。细胞学习通过在有利的相互作用期间增加细胞活性来再现。细胞活动的波动是由恒温器控制的。细胞速度的方向根据模仿致密流体的随机规则而改变。我们开发了一个动力学Monte Carlo算法的启发,直接模拟Monte Carlo(DSMC)方法最初用于稀释气体。分析最初局部肿瘤的演变。随着场调节活动波动的减少,观察到质量上不同的行为。对于高场值,即有效热化,癌症得到控制。对于小的视野值,癌症快速且单调地逃脱免疫监视。对于分离这两个域的临界场值,免疫疗法的3E被再现,具有癌症的明显初始消除、长的准平衡期随后是大的波动、以及癌症的最终逃逸,甚至对于免疫系统细胞的有利产生。对于略小于临界值的场值,自发观察到与临床观察一致的免疫系统细胞数量的更有规律的振荡。免疫系统的刺激可能对肿瘤发生的拮抗作用在模型中通过免疫系统细胞和癌细胞的自催化产物的活性加权速率常数再现。在波动的非均匀系统中满足了启动振荡的局部有利条件,能够产生一小群免疫系统细胞,其活性大于周围癌细胞的活性。

英文摘要:

The competition between cancer cells and immune system cells in inhomogeneous conditions is described at cell scale within the framework of the thermostatted kinetic theory. Cell learning is reproduced by increased cell activity during favorable interactions. The cell activity fluctuations are controlled by a thermostat. The direction of cell velocity is changed according to stochastic rules mimicking a dense fluid. We develop a kinetic Monte Carlo algorithm inspired from the direct simulation Monte Carlo (DSMC) method initially used for dilute gases. The evolution of an initially localized tumor is analyzed. Qualitatively different behaviors are observed as the field regulating activity fluctuations decreases. For high field values, i.e. efficient thermalization, cancer is controlled. For small field values, cancer rapidly and monotonously escapes from immunosurveillance. For the critical field value separating these two domains, the 3E's of immunotherapy are reproduced, with an apparent initial elimination of cancer, a long quasi-equilibrium period followed by large fluctuations, and the final escape of cancer, even for a favored production of immune system cells. For field values slightly smaller than the critical value, more regular oscillations of the number of immune system cells are spontaneously observed in agreement with clinical observations. The antagonistic effects that the stimulation of the immune system may have on oncogenesis are reproduced in the model by activity-weighted rate constants for the autocatalytic productions of immune system cells and cancer cells. Local favorable conditions for the launching of the oscillations are met in the fluctuating inhomogeneous system, able to generate a small cluster of immune system cells with larger activities than those of the surrounding cancer cells.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑