Fruit flies reveal features of human intestinal cancer

Fruit flies reveal features of human intestinal cancer
A 4-week-old Drosophila gut with a large Apc-Ras tumor (in green) Credit: Andreu Casali

Researchers in Spain have determined how a transcription factor known as Mirror regulates tumour-like growth in the intestines of fruit flies. The scientists believe a related system may be at work in humans during the progression of colorectal cancer due to the observation of similar genes and genetic interactions in cultured colorectal cancer cells. The results are reported in the journal EMBO Reports.

Colorectal cancer leads to more than half a million deaths worldwide each year. The disease originates in the of the gastrointestinal track mainly due to aberrations in the molecular signaling activities of cells.

"We have been able to use flies as a model system to study molecular events that are very similar to the steps that take place in in humans and we have been able to use this system to identify new genetic regulations relevant to human disease," says Andreu Casali, lead author of the study and a research associate at the Institute for Research in Biomedicine in Barcelona.

Mutations in two signalling pathways – the Wnt and EGFR/Ras pathways – are known to activate tumour-like growths in the intestines of fruit flies. In Drosophila, the researchers were able to show that activity of the Decapentaplegic (Dpp) pathway suppresses the growth of these intestinal tumours but that this suppression is counteracted by the Mirror transcription factor, a specific type of Irx transcription factor.

Fruit flies reveal features of human intestinal cancer
A 4-week-old Drosophila gut where the expression of Mirror transcription factor interference RNA blocks the growth of the Apc-Ras tumor. Credit: Andreu Casali

In humans, the equivalent of Dpp is , a component of the Transforming Growth Factor-beta signaling pathway. "Our results in lead us to think that Irx such as Mirror might play a similar role in flies and humans, namely reducing the ability of tumour cells to respond to Transforming Growth Factor-beta in the transition from a benign adenoma to more aggressive carcinoma in the human colon," says Casali. Transforming Growth Factor-beta typically acts as a brake on cell growth in the signaling system of the cell. Therefore Irx transcription factors like Mirror may be responsible under certain conditions for favouring and leading to cell proliferation that is consistent with the hallmarks of cancer in flies and humans. It may now be possible to test possible interventions for these cancer-like processes using the fly as a model system.

More information: Iro/Irx transcription factors negatively regulate Dpp/TGF-beta pathway activity during intestinal tumorigenesis, EMBO Reports, 2014.

Journal information: EMBO Reports
Provided by EMBO
Citation: Fruit flies reveal features of human intestinal cancer (2014, October 8) retrieved 17 April 2024 from
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