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New Technique To Improve Treatment for Pancreatic Cancer

  • Health

Identifying pancreatic cancer at an early stage and the difficulty in treating it when diagnosed at a later stage makes it a devastating disease.

Although various treatment options such as surgery, radiotherapy, and chemotherapy are available, the mortality rate remains extremely high, so efforts are increasingly being targeted at improving its detection and treatment.

‘Combining these microRNAs and chemotherapy drug gemcitabine helps kill cancer cells effectively and could improve the ability to treat pancreatic cancer.’

In a study reported recently in the journal Scientific Reports, a team centered at Tokyo Medical and Dental University (TMDU) identified two molecules that can improve the response of pancreatic cancer to a common chemotherapy drug and also predict the prognosis of pancreatic cancer patients. These findings could pave the way to novel combined treatments for this disease.

Tumors can develop and spread via various processes, one of which is the epithelial-mesenchymal transition (EMT). In this transition, cells lose the ability to adhere strongly to each other, enabling them to disperse and invade tissues, where they can become established and multiply.

In this new study, researchers employed a cell-based reporter system to screen a collection of over 1000 gene-regulatory factors called microRNAs for the ability to influence this transition and identified some with particularly potent effects.

“Our system is based around a molecule called E-cadherin, which suppresses tumor growth in part by maintaining cells in an epithelial rather than a mesenchymal state,” Tomoki Muramatsu of TMDU says.

“Using this system, we can visualize the expression of a fluorescent protein and monitor the transcriptional activity from the E-cadherin promoter region as fluorescent intensity, allowing the screening of EMT-suppressive miRNAs.”

The team narrowed down the approximately 1000 microRNAs to a handful that induced strong fluorescence in the system, and then reduced these to two that they confirmed could increase E-cadherin expression in pancreatic cancer cells.

Their associations with pancreatic cancer were then confirmed by measuring their levels in 24 pancreatic cancer cell lines, which were lower than in normal cells, suggesting their tumor-suppressive functions.

“When we analyzed these microRNAs in more detail, we found that they reduced cancer cell migration and invasion by targeting genes related to EMT, essentially preventing or reversing this,” Johji Inazawa says.

“This effect was particularly interesting when it was observed alongside the effect of the chemotherapy drug gemcitabine. When these microRNAs were administered, gemcitabine was much more effective at killing cancer cells.”

The findings suggest that therapies combining these microRNAs and gemcitabine could improve our ability to treat pancreatic cancer, and measurement of microRNA levels could also provide a guide to the prognosis in such cases.

Source: Eurekalert

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