Abstract
Schizophrenia (SCZ), a major mental disease, is associated with reduced risk for different types of cancers, with the exception of breast, endometrial and pancreatic cancers. The lower risk of cancer in first-degree relatives of SCZ patients rules out the drug effects as the cause of reduced cancer risk in SCZ. While genetic polymorphisms were attributed to the reduced cancer risk in SCZ, since hundreds of genes have been linked to SCZ and the effect size of each gene is small (< 1 %), the reduced cancer risk cannot be due to specific genetic polymorphisms. The same is true in cancer, as specific genetic changes are correlated to only 5–10 % of all cancers.
In post-mortem brain studies we found abnormal DNA methylation of the regulatory regions of several genes such as RELN, MB-COMT, MAOA, 5-HTT and HTR2A associated with corresponding altered expression in SCZ patients. As a subset of these epigenetic alterations (e.g. MB-COMT, HTR2A, and 5-HTT) are retained in DNA derived from the saliva of drug naïve SCZ patients, these alterations are not limited to brain and are independent of drug use. In addition to RELN, MB-COMT and MAOA, dysfunctionality of TGFβ, immune system, VGEF, FOXO and specific miRNAs are linked to both SCZ and cancer. Interestingly, the changes in SCZ are often opposite in nature to those observed in cancer suggesting that they may predispose to SCZ, but reduce cancer risk. Therefore, knowledge from one disease may help to understand the molecular basis of the other disease and assist the implementation of therapeutic strategies.
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Abbreviations
- 5-HTT:
-
5-hydroxytryptamine (serotonin) transporter
- BD:
-
Bipolar Disorder
- BMP:
-
Bone Morphogenetic Protein
- COMT:
-
Catechol-O- Methyltransferase
- DNMT1:
-
DNA Methyltransferase 1
- DRD1:
-
Dopamine Receptor type 1
- DRD2:
-
Dopamine Receptor type 2
- FOXO:
-
O subclass of the Forkhead Family of Transcription Factors
- GABA:
-
Gamma Amino Butyric Acid
- GAD1:
-
Glutamate decarboxylase 1
- HAP1:
-
Huntingtin Associated Protein 1
- HD:
-
Huntington’s Disease
- HIP:
-
Huntingtin Interacting Protein
- HTR2A:
-
Hydroxytriptamine (serotonin) type 2 receptor
- MAOA:
-
Mono Amine Oxidase A
- MB-COMT:
-
Membrane-Bound Catechol-O-Methyltransferase
- MDD:
-
Major Depressive Disorder
- MHC:
-
Major Histocompatibility Complex
- MIA:
-
Maternal Immune Activation
- PD:
-
Parkinson’s Disease
- RELN:
-
Reelin
- SCZ:
-
Schizophrenia
- SSRIs:
-
Serotonin Specific Reuptake Inhibitors
- TGF-β:
-
Transforming growth factor beta
- VEGF:
-
Vascular Endothelial Growth Factor
- VEGFR2:
-
VEGF receptor 2
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Eskandari, M., Abdolmaleky, H., Zhou, JR., Thiagalingam, S. (2015). Reduced Risk of Cancer in Schizophrenia, a Bridge Toward Etio-Pathology and Therapy of Both Diseases. In: Mehdipour, P. (eds) Epigenetics Territory and Cancer. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-9639-2_5
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