Evolution of cooperation among tumor cells - PubMed (original) (raw)
Review
Evolution of cooperation among tumor cells
Robert Axelrod et al. Proc Natl Acad Sci U S A. 2006.
Abstract
The evolution of cooperation has a well established theoretical framework based on game theory. This approach has made valuable contributions to a wide variety of disciplines, including political science, economics, and evolutionary biology. Existing cancer theory suggests that individual clones of cancer cells evolve independently from one another, acquiring all of the genetic traits or hallmarks necessary to form a malignant tumor. It is also now recognized that tumors are heterotypic, with cancer cells interacting with normal stromal cells within the tissue microenvironment, including endothelial, stromal, and nerve cells. This tumor cell-stromal cell interaction in itself is a form of commensalism, because it has been demonstrated that these nonmalignant cells support and even enable tumor growth. Here, we add to this theory by regarding tumor cells as game players whose interactions help to determine their Darwinian fitness. We marshal evidence that tumor cells overcome certain host defenses by means of diffusible products. Our original contribution is to raise the possibility that two nearby cells can protect each other from a set of host defenses that neither could survive alone. Cooperation can evolve as by-product mutualism among genetically diverse tumor cells. Our hypothesis supplements, but does not supplant, the traditional view of carcinogenesis in which one clonal population of cells develops all of the necessary genetic traits independently to form a tumor. Cooperation through the sharing of diffusible products raises new questions about tumorigenesis and has implications for understanding observed phenomena, designing new experiments, and developing new therapeutic approaches.
Conflict of interest statement
Conflict of interest statement: No conflicts declared.
Figures
Fig. 1.
Tumor progression can reach full malignancy before any one cell accumulates each of the necessary mutations. (a) Traditional view of tumor progression: Competition. Genetically unstable partially transformed cells (●) proliferate. The cells compete for limited oxygen, essential nutrients, and GFs; therefore, many die (). Eventually, one cell accumulates sufficient mutations to express all of the functions required for a clone of fully malignant cells to emerge (●). (b) Hypothesis of tumor progression: Cooperation. Genetically unstable partially transformed cells (●) proliferate and yield different mutant cell types (, ). The different cell types cooperate with each other, enabling them to survive and proliferate. The concept of cooperation among partially transformed cells is added to the traditional view of tumor progression. As in the traditional view, eventually one cell may accumulate sufficient mutations to express all of the functions required for a clone of fully malignant cells to emerge (●). An example of cells that cooperate by producing different GFs is shown in Fig. 2.
Fig. 2.
Intratumor cooperation can occur among partially transformed mutant cells that have complementary needs, such as two different GFs. Some cells () produce only GF A, and other cells () produce only GF B, but together they produce both GFs. Crossfeeding is a form of cooperation that enables each cell type to survive and proliferate.
Comment in
- 'Tit-for-tat' in cell biology.
Green DR. Green DR. Nat Rev Mol Cell Biol. 2011 Feb;12(2):73. doi: 10.1038/nrm3054. Nat Rev Mol Cell Biol. 2011. PMID: 21252991 No abstract available.
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