Abstract
Systemic approaches have gained a prominent role in cancer research, enhancing the possibility of dealing with complex molecular networks and even expanding the focus of research to higher levels of organization above the cell. In this chapter I review some major examples: network models of the cell, with their landscapes of functional states and switch-like transitions, applied to gene expression and cell processes (particularly worthwhile is Laforge et al.’s Autostabilization-Selection Model); dynamic models of the regulatory interactions between cells and the Extra-Cellular Matrix; large scale descriptions of genomic heterogeneity. In systems theory, the whole is more than the sum of its parts, in so far as it has properties that are not encountered in the parts themselves. Also, the parts are transformed once the whole has been integrated. In the end, I will argue, that a Systemic Approach is interested not only in accounting relationally for how systems work, but in how their organization comes about, opening to deeper epistemological, theoretical and experimental challenges.
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Notes
- 1.
- 2.
However, a systemic thought is much more antique in science. In chemistry and thermodynamics such notion of system was already clear and commonly assumed in scientific practice since the end of the nineteenth century. The same can be said about electromagnetic field and electric circuits. In 1952, Tellegen proved a theorem that states the dependence of systems’ behaviours on two independent components: constitutive laws of elements and emergent laws from their relational structure (Tellegen 1952; Penfield et al. 1970). Tellegen’s theorem – and other similar discoveries – have important practical consequences, which are related to the relevance of the relational structure that is irrespective of the single elements that compose the system. I have to thank Alessandro Giuliani for clarifying this and other points, eventually related to what I have called “non-trivial determinism” in the volume (see Chap. 6).
- 3.
Various authors have confronted this subject since the early decades of the twentieth century. Amongst them, we can mention Goldstein, Jonas, Bergson, Simondon, Ruyer, Haldane, Whitehead. Some philosophers, such as Quine or Duhem, developed extreme conclusions in the philosophical sphere. Some form of extreme anti-reductionism is presented as ‘vitalism’. ‘Holistic’ positions can be found in contemporary biology too. Radical view points have been expressed, for example, by biologist Hans Driesch. In general, the systemic perspectives that we consider here are those inspired by the works of L. von Bertalanffy (von Bertalanffy 1968) or other authors like C.H. Waddington and J. Needham or P. Weiss. We will see how a systemic approach can be compatible with reductionist accounts.
- 4.
However, mechanistic accounts are, sometimes, implicitly assumed. The concept of functional state, for example, is implicitly assumed in the definition of some explanatory frameworks (like the concept of stem cell, see Sect. 2.7) but not without epistemological implications, as we will see more specifically in Chap. 7.
- 5.
The model incorporates experimental data from gene expression studies, more specifically about the modulation of the concentration of transcriptional regulators in the cell in relation to differentiation. The model incorporates stochastic gene expression with computer simulation models. It also takes into account similarities with models pertaining to the theories of morphogenesis (cf. with Sect. 1.2.1). One important difference is that in the Autostabilization-Selection Model the molecules only act as stabilizers of a prior state reached stochastically, not as promoters of a change in cellular state, as in morphogenesis. Embryogenesis is the evolution of the first cell, the zygote, as it moves towards the balance mentioned here; instead, cancer is the destruction of the same balance.
- 6.
Mesenchyme is a type of tissue composed of loose cells embedded in the extracellular matrix (a mesh of proteins and fluid) which allows mesenchymal cells to migrate easily and play a crucial role in the origin and development of morphological structures during early development (especially those concerning connective tissues, from bones and cartilage to the lymphatic and circulatory systems). The interactions between mesenchyme and another tissue component, epithelium, help to form nearly every organ in the body.
- 7.
Some discussions pointed out how classical physical science attempts to reduce noise by simply increasing the sample size. However, in complex biological systems this does not solve the issue of heterogeneity, because variability is not simply a “noise” tied to a specific experimental approach (see also Heng et al. 2008).
- 8.
Taking inspiration from evolutionary theory (Serrelli and Gontier 2015), this literature employs the terms “macroevolution” and “microevolution” for demarcating genetic mutations from genomic alterations, punctual events from dynamic processes. In this sense, a macro-evolutionary change would be an overall change of the organizational dynamics, which might give way to cancer (cfr. Heng et al. 2009).
- 9.
A philosophical frame for this problem is proposed in Sect. 6.4, with the idea that “stability wins over specificity” in biological entities. That is, relational stability of a system is the viability condition for causal specificity of specific events (e.g., genetic mutation) within it.
- 10.
For a philosophical discussion of this dimension of causality see Sect. 5.2.
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- 12.
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Bertolaso, M. (2016). The Systemic Approach to Cancer: Models and Epistemology. In: Philosophy of Cancer. History, Philosophy and Theory of the Life Sciences, vol 18. Springer, Dordrecht. https://doi.org/10.1007/978-94-024-0865-2_3
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