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New front opened in fight against common cancer driver
20 February 2020
Walter and Eliza Hall Institute researchers have revealed a new vulnerability in lymphomas that are driven by one of the most common cancer-causing changes in cells.
been discovered by (from left) Dr Hai Vu Nguyen, Professor
Suzanne Cory and Dr Cassandra Vandenberg.
The team revealed that the protein MNT is required for the survival of lymphoma cells that are driven by the protein MYC. Up to 70 per cent of human cancers – including many blood cancers – have high levels of MYC, a protein which forces cells into abnormally rapid growth.
The research, led by Professor Suzanne Cory, Dr Hai Vu Nguyen and Dr Cassandra Vandenberg, suggests that potential therapies targeting MNT could be effective new treatments for MYC-driven cancers.
At a glance
- The majority of human cancers are driven by high levels of the protein MYC, but it has been challenging to develop new medicines that directly inhibit MYC.
- Our researchers revealed that MYC-driven lymphoma cells rely on the protein MNT for their survival, and without MNT the cells rapidly die.
- The results suggest that inhibiting MNT might be an effective new approach for treating MYC-driven cancers.
A new target
High levels of the MYC protein are found in up to 70 per cent of human cancers. MYC controls hundreds of genes, driving rapid cell production, said Professor Cory, who has studied MYC-driven cancers since the early 1980s.
“For many years we hoped for a drug that could directly target MYC as a potential cancer treatment, but to date such inhibitors have been disappointing in the clinic,” she said. “It became clear we needed to look for other vulnerabilities in MYC-driven cancers.”
The team successfully identified a new target for tackling MYC-driven cancers by homing in on the role of a protein related to MYC, called MNT. Their research was published today in the journal Blood.
By deleting the gene encoding MNT from MYC-driven lymphocytes – the type of immune cell from which lymphomas arise – we found that MNT played a significant role in MYC-driven lymphoma development, Dr Vandenberg said.
“In our laboratory models, the incidence of MYC-driven lymphomas was greatly reduced when MNT was absent. This showed us that MNT had a vital role at some stage during lymphoma development,” she said.
“That role became clear when we found that pre-cancerous cells lacking MNT had high levels of apoptotic cell death,” said Dr Nguyen. “Thus, MNT is required to keep MYC-driven cells alive.”
Towards better treatments
Dr Nguyen said that the team went on to examine the impact of depleting MNT from fully malignant MYC-driven lymphomas. “When we did this, we saw that the tumour cells rapidly died,” he said. “This suggests MNT could well be a promising new therapeutic target for MYC-driven lymphomas.”
Professor Cory said the researchers would now look at whether MNT was important in other MYC-driven cancers.
“Inhibiting MNT may also make tumours more susceptible to other drugs such a BH3-mimetics which directly target the cell’s death machinery.
“Although a lot of work remains to be done to develop and test a new MNT-inhibiting therapy, our discovery opens up a new front in tackling MYC-driven cancers,” Professor Cory said.
The research was supported by the Australian National Health and Medical Research Council, the US-based Leukemia and Lymphoma Society, philanthropic support to the Walter and Eliza Hall Institute and the Victoria Government.
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Super Content:
Our researchers have discovered a promising strategy for treating cancers that are caused by one of the most common cancer-causing changes in cells.
Institute researchers have discovered that targeting a cell ‘survival’ protein could help treat some lymphomas, including those that are resistant to existing therapies.
WEHI has a strong history of significant discoveries of clinical importance and an outstanding international reputation.
Explore the current opportunities to join our team.