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Summary
Pregnancy and cancer share immune tolerance mechanisms for foreign tissues. This review suggests that the evolution of sexual reproduction created an immune tolerance system that also allows cancers to evade detection.
Area of Science:
- Reproductive Biology
- Oncologic Immunology
- Evolutionary Biology
Background:
- Sexual reproduction necessitates tolerance to HLA-incompatible tissues.
- Cancer involves the development of neoantigens, which are foreign to the host immune system.
- Both pregnancy and cancer present challenges to the maternal/host immune system.
Purpose of the Study:
- To review and compare the immune tolerance mechanisms observed in pregnancy and cancer.
- To explore the evolutionary origins of immune tolerance in the context of sexual reproduction and oncogenesis.
- To propose a link between the immune adaptations for reproduction and cancer immune evasion.
Main Methods:
- Literature review of reproductive biology and cancer immunology.
- Comparative analysis of immune tolerance mechanisms.
- Phylogenetic discussion of sexual reproduction and cancer development.
Main Results:
- Striking similarities exist in the tolerance of neoantigens during pregnancy and in cancer.
- Mechanisms evolved for accommodating HLA-incompatible fetal tissue may be co-opted for cancer tolerance.
- An evolutionary perspective highlights a potential shared pathway for immune evasion.
Conclusions:
- The immune tolerance developed for successful sexual reproduction may inadvertently facilitate cancer progression.
- Understanding these shared mechanisms could offer new therapeutic strategies for cancer treatment.
- Further research into the evolutionary immunology of reproduction and cancer is warranted.