Colon Cancer protects itself by changing the VDR and CYP3A4 genes
Correlated downregulation of VDR and CYP3A4 in colorectal cancer
Mol Biol Rep . 2022 Dec 5. doi: 10.1007/s11033-022-08141-2 PDF is behind a paywall
Hossein Sadeghi 1 , Veys Hashemnia 2 , Ehsan Nazemalhosseini-Mojarad 3 , Mohammad Reza Ghasemi 2 , Reza Mirfakhraie 4 5
Background: The evidence obtained from experimental studies suggests the tumor-suppressive effects of vitamin D by controlling the differentiation, proliferation, and apoptosis in cancerous cells. Furthermore, the deregulation of genes involved in vitamin D metabolism has been reported in several types of cancer.
Methods: In the present study, we investigated the expression level of vitamin D metabolic pathway genes, including VDR, CYP3A4, RXRa, and GC, in colorectal cancer (CRC) samples compared with the adjacent tissues by using quantitative RT-PCR.
Results: The results indicated significant downregulation of CYP3A4 and VDR genes in CRC tissues compared with the adjacent control tissues (p < 0.01). RXRA and GC expression levels did not show any significant alteration among the studied samples. Moreover, a positive correlation was observed between the expression level of CYP3A4 and VDR genes (p < 0.0001). ROC curve analysis also revealed the potential diagnostic power of CYP3A4 and VDR genes in CRC samples.
Conclusion: Reduction in the expression of both CYP3A4 and VDR plays an important role in CRC due to the possible impairment in vitamin D metabolism. Further studies concerning the relationship between the expression of these genes and colorectal cancer pathogenesis and treatment are recommended.
Butyrate upregulates VDR in the colon
14th activator of the Vitamin D Receptor – Butyrate (from gut bacteria, or supplement)
VitaminDWiki -Some diseases reduce vitamin D getting to blood or cells
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VitaminDWiki - Vitamin D Receptor deactivated by some health problems - many studies
VitaminDWiki - Genetics chart shows the vitamin D genes

CYP3A4 (7 as of Dec 2022)
VitaminDWiki - studies in both categories Colon Cancer and Vitamin D Receptor
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92 VitaminDWiki VDR pages have CANCER in title (as of Aug 2025)
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VitaminDWiki - studies in both categories Colon Cancer and Genetics
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VitaminDWiki - Cancer - Colon category contains
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