A new way to restrict the ability of cancer to use glucose for energy has been identified; and it could be one main therapeutic strategy.
Cancer cells consume exorbitant amounts of glucose, a key source of energy, and shutting down this glucose consumption has long been considered a logical therapeutic strategy.
Cancer Immunotherapy
Cancer immunotherapy is a new advancement in cancer treatment that uses certain components of a person''s immune system to fight against cancer cells.
Advertisement
‘Treating cancer cells with drugs that block both CDK8 and glycolysis slowed the growth of the tumor more effectively than either approach alone.’
Tweet it Now
However, good pharmacological targets to stop cancers' ability to uptake and metabolize glucose are missing. In a new study published in Cell Reports, a team of University of Colorado Cancer Center researchers, led by Matthew Galbraith, and Joaquin Espinosa, finally identifies a way to restrict the ability of cancer to use glucose for energy.
Over-expression of the gene CDK8 is linked to the development of many cancers including colorectal cancer, melanoma, and breast cancer, where it regulates pathways that drive the growth and survival of cancer cells.
![Skin Disease]( "Skin Disease")
Skin diseases also known as dermatologic disorders are many in number and so are their causes. The common skin diseases or skin disorders are usually related to the epidermal layer of skin.
Although a number of drugs aimed at blocking CDK8 activity are currently being developed, it is not yet clear how effective they are at treating various cancers.
Galbraith and Espinosa have been working to better understand the role of CDK8 in cancer biology in the hopes of aiding the introduction of CDK8-based therapies as cancer treatments.
Their most recent study, which was funded in part by the Cancer League of Colorado and the Mary Miller and Charlie Fonfara-Larose Leukemia in Down Syndrome Fund, demonstrates that CDK8 plays a critical role in allowing cancer cells to use glucose as an energy source.
The finding takes place against the backdrop of the tissue conditions in which tumors grow - as cancer cells rapidly multiply, their growth often outstrips their blood supply, leading to depletion of oxygen (i.e. hypoxia) and other nutrients such as glucose.
In 2013, the group published a paper showing that CDK8 is important for activation of many genes switched on in hypoxic conditions. During adaptation to these conditions, cancer cells must alter their metabolism to consume more glucose through a process called glycolysis.
In fact, many cancer cells have permanent increases in glycolysis, maintained even in conditions of plentiful oxygen, a phenomenon known as the Warburg effect, which was described as far back as 1924. Consequently, many cancers are heavily dependent on glucose metabolism for their growth and survival.
This is true to the point that doctors use glucose isotopes and PET scans to pinpoint the exact location of a tumor and its metastases within the human body - where there are abnormally high levels of glucose being used, chances are there is a cancerous growth.
When Galbraith used a sophisticated chemical genetics approach to specifically switch off CDK8 activity in colorectal cancer cells, he saw that the cells failed to activate glycolysis genes and took up much less glucose. He confirmed this in experiments showing that blocking CDK8 activity leads to a lower rate of glucose use.
"Because of this role of CDK8 in glycolysis, I reasoned that the cells with impaired CDK8 activity should be more susceptible to drugs that block glycolysis," Galbraith says. Sure enough, treating cancer cells with drugs that block both CDK8 and glycolysis slowed their growth more effectively than either approach alone.
"These are very exciting discoveries. The Warburg effect and consequent addiction to glucose is a hallmark of cancerous tissues, something that distinguishes cancer cells from most normal tissues. Therefore, combining drugs that block CDK8 activity with those that block glycolysis may enable specific targeting of cancer cells without harmful effects on normal cells," says Espinosa, the paper's senior author.
Source: Eurekalert
Skin Disease
Skin diseases also known as dermatologic disorders are many in number and so are their causes. The common skin diseases or skin disorders are usually related to the epidermal layer of skin.
Advertisement
Although a number of drugs aimed at blocking CDK8 activity are currently being developed, it is not yet clear how effective they are at treating various cancers.
Galbraith and Espinosa have been working to better understand the role of CDK8 in cancer biology in the hopes of aiding the introduction of CDK8-based therapies as cancer treatments.
Their most recent study, which was funded in part by the Cancer League of Colorado and the Mary Miller and Charlie Fonfara-Larose Leukemia in Down Syndrome Fund, demonstrates that CDK8 plays a critical role in allowing cancer cells to use glucose as an energy source.
The finding takes place against the backdrop of the tissue conditions in which tumors grow - as cancer cells rapidly multiply, their growth often outstrips their blood supply, leading to depletion of oxygen (i.e. hypoxia) and other nutrients such as glucose.
In 2013, the group published a paper showing that CDK8 is important for activation of many genes switched on in hypoxic conditions. During adaptation to these conditions, cancer cells must alter their metabolism to consume more glucose through a process called glycolysis.
In fact, many cancer cells have permanent increases in glycolysis, maintained even in conditions of plentiful oxygen, a phenomenon known as the Warburg effect, which was described as far back as 1924. Consequently, many cancers are heavily dependent on glucose metabolism for their growth and survival.
This is true to the point that doctors use glucose isotopes and PET scans to pinpoint the exact location of a tumor and its metastases within the human body - where there are abnormally high levels of glucose being used, chances are there is a cancerous growth.
When Galbraith used a sophisticated chemical genetics approach to specifically switch off CDK8 activity in colorectal cancer cells, he saw that the cells failed to activate glycolysis genes and took up much less glucose. He confirmed this in experiments showing that blocking CDK8 activity leads to a lower rate of glucose use.
"Because of this role of CDK8 in glycolysis, I reasoned that the cells with impaired CDK8 activity should be more susceptible to drugs that block glycolysis," Galbraith says. Sure enough, treating cancer cells with drugs that block both CDK8 and glycolysis slowed their growth more effectively than either approach alone.
"These are very exciting discoveries. The Warburg effect and consequent addiction to glucose is a hallmark of cancerous tissues, something that distinguishes cancer cells from most normal tissues. Therefore, combining drugs that block CDK8 activity with those that block glycolysis may enable specific targeting of cancer cells without harmful effects on normal cells," says Espinosa, the paper's senior author.
Source: Eurekalert
Maxillary Sinus Cancer
Cancers of paranasal sinuses are rare but if they arise, the most common sites affected are the maxillary sinuses.
Advertisement
 Cancers of the Ear / Ear CancersSkin cancer is the most common type of ear cancer. Cancer of the ear canal can be cured if limited to the canal and diagnosed early. The canal, eardrum, and hearing bones may need removal. | Advertisement
|
Advertisement
Recommended Readings
Latest Cancer News
Researchers found a pathway linked to allergies that, when blocked, triggers antitumor immunity in lung cancer mouse models.
The occurrence of epimutations early in pregnancy challenges traditional theories related to carcinogenesis and the risk of developing breast cancer.
More affected relatives, higher lung cancer risk; participants with affected mothers or siblings faced increased risk.
Colorectal cancer can be lowered by up to 7% by increasing dietary consumption of folate rich foods like spinach, broccoli or taking folate supplements.
The effects and mechanisms of microRNA-451a (miR-451a), which hinders the progression of gemcitabine-resistant biliary tract cancers, are under study.