Health

How obesity promotes breast cancer

Sunday, October 22, 2017

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OBESITY leads to the release of cytokines into the bloodstream, which impact the metabolism of breast cancer cells, making them more aggressive as a result.

Scientists from Helmholtz Zentrum München, Technische Universität München (TUM), and Heidelberg University Hospital report on this in Cell Metabolism, a release issued on Friday said.

The team has already been able to halt this mechanism with an antibody treatment, the release said.

The number of people with obesity is increasing rapidly worldwide. The German Cancer Research Center (DKFZ) recently reported that, according to the World Health Organization, the number of children and adolescents with obesity increased tenfold between 1975 and 2016. Severe overweight can lead to various health impairments. Besides inducing cardiovascular diseases, obesity, for example, also promotes the development of cancer and metastases, the release said.

The current study elucidates an as yet unknown mechanism making breast cancer more aggressive. The enzyme ACC1 — which stands for acetyl-CoA-carboxylase 1 — plays a central role in this process, said Dr Mauricio Berriel Diaz, deputy director of the Institute for Diabetes and Cancer (IDC) at Helmholtz Zentrum München.

He led the study together with Stephan Herzig, director of the IDC and professor for molecular metabolic control at TUM and Heidelberg University Hospital.

“ACC1 is a key component of fatty acid synthesis,” said Berriel Diaz. “However, its function is impaired by the cytokines leptin and TGF-.”

The levels of these cytokines are increased particularly in the blood of severely overweight subjects, the release continued.

Fatty acid precursors promote metastases

The scientists demonstrated that the described inhibition of ACC1 leads to the accumulation of the fatty acid precursor acetyl-CoA. This precursor is transferred to certain gene “switches”, according to the release, that in turn increase the metastatic capacity of cancer cells by activating a specific gene programme.

“Using human tissue from breast cancer metastases, we were able to show that ACC1 was significantly less active there,” said Marcos Rios Garcia, first author of the study. When the scientists blocked the as yet unknown signalling pathway with an antibody (directed against the leptin receptor), this led to a significantly reduced metastatic spread of breast cancer tumours in an experimental model, the release explained.

In the future, the researchers want to substantiate the data on the newly discovered mechanism in further studies. In addition, they are also considering related intervention points that could possibly be exploited therapeutically. “Blocking the signalling pathways and switching off the metastasis-related genes could be a therapeutic target,” Herzig said. “As part of the so-called neoadjuvant therapy, the risk of metastases or the recurrence of tumours could be reduced prior to the surgical removal of the tumour.”

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