Neuro-oncology

Study provides better understanding of how brain tumors ‘feed’

All cancer tumors have one thing in common – they must feed themselves to grow and spread, a difficult feat since they are usually in a tumor microenvironment with limited nutrients and oxygen. A study at The University of Texas MD Anderson Cancer Center has revealed new details about how an enzyme called acetyl-CoA synthetase 2 (ACSS2) allows brain tumors to grow despite their harsh surroundings.

Zhimin Lu, Ph.D., professor of Neuro-Oncology.
Zhimin Lu, Ph.D., professor of Neuro-Oncology.
Source: MD Anderson Cancer Center

The findings portends ACSS2 as a potential player in new approaches to treating this often deadly disease. ACSS2 provides tumors a competitive edge by enhancing their ability to use a cellular salt called acetate as a carbon-based food source rather than the more desirable glucose which is often in short supply in cancer cells. This lifeline allows cancer cells at the core of the tumor to survive and even grow as it battles with nutrient deficiency.

Current therapies and the body’s own immune system are not efficient at stopping this vital nutrient pathway in cancer cells, and little is known about how these life-giving proteins are transported from cytosol, a liquid cell component, into the nucleus via a process called nuclear translocation. The ability to halt nuclear translocation of ACSS2 would cut off the cancer cell’s self-maintaining ability at its most basic level. The study, led by Zhimin Lu, Ph.D., professor of Neuro-Oncology, provided new information about nuclear translocation and how ACSS2 may offer a new approach for therapy. “Overcoming metabolic stress is a critical step in solid tumor growth. Acetyl coenzyme A (CoA) generated via glucose and acetate uptake is a key carbon source for important cellular processes such as histone acetylation and gene expression,” said Lu. “However, how acetyl CoA is produced under nutritional stress is unclear. Our study explains the underlying mechanics of how this occurs, with ACSS2 as a novel and important method for gene expression under these circumstances.”

Using a CRISPR gene editing process, Lu’s team revealed what roles ACSS2 plays in histone acetylation by generation of nuclear acetyl-CoA from acetate within the cell’s nucleus. It also demonstrated the significance of histone modification via a metabolic enzyme in maintaining cell stability and tumor development. Histones are proteins that act as spools around which DNA winds and are crucial to gene regulation, while histone acetylation is a modification process critical to gene expression.

In essence, ACSS2 gives genetic permission for the production of lysosomes, cellular structures that serve as the cell’s waste disposal system, thus ridding the cell of unwanted materials, while recycling digested products for protein, DNA, and lipid synthesis. Lysosomes are recognized as a contributing factor in tumor development. ACSS2 also promotes a cannibalistic cell-feeding mechanism called autophagy, allowing lysosomes to receive, digest, and recycle much-needed nutrients. When nutrients located outside of the cell are limited, ACSS2 is able to reprogram cancer cell metabolism by increasing autophagy and reusing lysosome-digested products from unwanted or stored materials for cell survival and growth. “These findings elucidate an instrumental interplay between reprogramming of metabolism and gene expression in cancer cells,” said Lu. “Inhibition of both ACSS2’s nuclear function and the metabolic pathway known as glycolysis, which converts glucose to tumor-feeding energy, appears to be an efficient approach for cancer treatment.”

 

Source: University of Texas M. D. Anderson Cancer Center

31.05.2017

Read all latest stories

Related articles

Photo

News • From nanotechnology

A better prognostic tool for brain cancer

A new nano-fabricated platform for observing brain cancer cells provides a much more detailed look at how the cells migrate and a more accurate post-surgery prognosis for brain cancer (glioblastoma)…

Photo

News • Bioelectronics for cancer screening

Smart devices to capture and release tumour cells

Basque researchers propose a bioelectronic device consisting of gold electrodes coated with a smart polymer capable of capturing and releasing cells in a non-invasive, controllable way.

Photo

News • Intratumoral approach for hard-to-treat glioma

Microdevices implanted into tumor to help treat brain cancer

A new type of microdevice could offer new ways to treat brain cancer. The shape and size of a grain of rice, it is implanted into a tumor to study the effects of ongoing therapies.

Related products

Mindray · BC-6200 / 6000 Auto Hematology Analyzer

Blood Cell Couner

Mindray · BC-6200 / 6000 Auto Hematology Analyzer

Shenzhen Mindray Bio-Medical Electronics Co., Ltd
Mindray · BC-6800Plus Auto Hematology Analyzer

Blood Cell Couner

Mindray · BC-6800Plus Auto Hematology Analyzer

Shenzhen Mindray Bio-Medical Electronics Co., Ltd
Promega · Maxwell CSC Instrument

Extraction

Promega · Maxwell CSC Instrument

Promega GmbH
SARSTEDT · BIOFLOAT™ cell culture plates

Pipette Tips

· SARSTEDT · BIOFLOAT™ cell culture plates

SARSTEDT AG & CO. KG
Sarstedt · Cell Culture Products

Specialties

Sarstedt · Cell Culture Products

SARSTEDT AG & CO. KG
Subscribe to Newsletter