Scientists Discover Achilles' Heel of Cancer Cells

The Achilles' heel of cancer cells has been identified by scientists. Several substances inhibiting so-called HDAC enzymes have been studied in trials in recent years.

"Trials have shown that HDAC inhibitors are very effective in arresting growth of cultured cancer cells. But apart from a very rare type of lymphoma, these drugs unfortunately do not clinically affect malignant tumours," said Prof. Dr. Olaf Witt, who heads a research department at DKFZ and is pediatrician at the Center for Child and Adolescent Medicine of Heidelberg University Hospital.

Cancer Key Facts and Statistics
Cancer is an abnormal cell growth and it can destroy other body tissues. 1 in 6 deaths that occur in the world is due to cancer. Here are some key facts and statistics about cancer

In the cell, histone deacetylases (HDAC) are responsible for removing small chemical tags called acetyl groups from histone proteins. Histones serve as coils the genetic material wraps around in the nucleus. The presence or absence of acetyl tags determines where genetic material is accessible and can get transcribed.

Now this is where Witt and his colleagues suspect the reason for the problems in clinical application of HDAC inhibitors. Currently available substances equally block all members of the large family of HDAC enzymes. Thus, they interfere with vital cellular functions and also harm healthy cells. This can lead to severe side effects preventing their administration at a sufficient dosage.

Searching for a solution to this dilemma, Witt's team came across a member of the HDAC family, HDAC11, which was identified only recently.

Quiz on Breast Cancer
Breast cancer is one of the leading causes of cancer deaths among women. It is often said that a woman who breast-feeds is at a lower risk of developing cancer compared to another who does not .Are these mere old wives tales or is there some truth in it? This quiz on breast cancer has all the details.

The researchers could show that many cancer cells, including cells of breast, liver and renal cancers, produce extraordinary high levels of HDAC11. This has not been observed in healthy cells, and hardly any specific functions of HDAC11 are known there.

"It therefore seemed obvious that a specific HDAC11 inhibitor would specifically target tumour cells, where this enzyme appears to play a critical role," said Dr. Hedwig Deubzer, first author of the article.

World Cancer Death Clock
World Cancer Death Clock is a dynamic calculator that constantly updates the number of people in the world dying due to various cancers.

As there are no specific HDAC11 inhibitors available yet, the team took a different approach to verify their hypothesis. Using molecular techniques, they turned off production of HDAC11 in breast, colon, prostate and ovarian cancer cell lines and likewise in control cells of healthy tissues.

The result: Cancer cells without HDAC11 were impaired in viability and more often underwent cell death (apoptosis). By contrast, loss of HDAC11 did not cause any noticeable changes in normal cells.

Associated With Higher Risk of Local Recurrence Is Triple-Negative Breast Cancer
Women with triple-negative breast cancer and no more than three positive lymph nodes following a mastectomy have a higher risk of local recurrence shows research.

"The result suggests that selective blocking of HDAC11 would act exclusively on tumour cells," said Hedwig Deubzer.

Numerous highly specific inhibitors against various cancer-relevant enzymes have been developed in recent years, with some of them already approved as drugs. This encourages the Heidelberg research team, jointly with Bayer Healthcare, to look for a suitable substance that specifically targets HDAC11.

Source-ANI