Featured Research

from universities, journals, and other organizations

More accurate markers identified for detecting response to epigenetic drugs for myelodysplastic syndromes

Date:
April 7, 2013
Source:
American Association for Cancer Research (AACR)
Summary:
Researchers have identified and validated two DNA methylation markers that could help physicians to more accurately determine a patient's response to epigenetic drugs for treatment of myelodysplastic syndromes (MDS), new research suggests.

Researchers have identified and validated two DNA methylation markers that could help physicians to more accurately determine a patient's response to epigenetic drugs for treatment of myelodysplastic syndromes (MDS), according to Xiaojing Yang, Ph.D., a postdoctoral fellow at the University of Southern California, Los Angeles, who presented the data at the AACR Annual Meeting 2013, held in Washington, D.C., April 6-10.

"The current feedback from physicians is that they cannot tell if a patient is really getting the epigenetic drug they are being treated with or not, which makes it difficult for them to decide whether to stop treatment or increase the dosage of the drug," said Yang. "This pushed us to think, why? Why didn't the current marker work and should we try to seek a better one?"

These drugs, called DNA methyltransferase inhibitors (DNMTi), work by turning on genes that suppress cancer development, according to Yang. In patients with MDS, these genes are often silenced by the attachment of chemicals called methyl groups to the DNA backbone of the gene (an epigenetic modification made through a process called methylation), and DNMTi prevent methyl group attachment to DNA.

Currently, measuring methylation changes in DNA sequences known as LINE-1 elements is widely used as a predictor of whether or not DNMTi are working, but recent research has found that LINE-1 remethylation after a DNMTi is withdrawn occurs faster than in other regions. This implies that LINE-1 methylation changes may not reflect overall demethylation effects of DNMTi, according to Yang.

Yang and colleagues sought to find improved markers of DNA methylation status. Using the Infinium DNA methylation platform, they assessed the methylation profile of 27,000 genomic regions. The team tested this methylation profile on both normal and tumor bladder tissue samples and on white blood cells from healthy donors. They identified 1,429 regions that were consistently methylated in all three samples.

They then tested the methylation profile of these 1,429 regions in T24 bladder cancer and HL60 leukemia cell lines treated with a DNMTi for 24 hours. Of these, 79 significantly responded to demethylation treatment and remained demethylated beyond 30 days. Further analysis focused on the top two regions, which showed consistent hypermethylation in normal and tumor samples.

To verify their findings, Yang and colleagues studied the DNA demethylation levels of those two markers in urine samples from seven patients with MDS treated with the DNMTi azacitidine. They found that the two markers were significantly demethylated, in contrast to LINE-1 methylation, which showed no clear decreasing trend.

According to Yang, these findings could lead to the use of a simple urine test for detecting response to a DNMTi.


Story Source:

The above story is based on materials provided by American Association for Cancer Research (AACR). Note: Materials may be edited for content and length.


Cite This Page:

American Association for Cancer Research (AACR). "More accurate markers identified for detecting response to epigenetic drugs for myelodysplastic syndromes." ScienceDaily. ScienceDaily, 7 April 2013. <www.sciencedaily.com/releases/2013/04/130407090634.htm>.
American Association for Cancer Research (AACR). (2013, April 7). More accurate markers identified for detecting response to epigenetic drugs for myelodysplastic syndromes. ScienceDaily. Retrieved July 30, 2014 from www.sciencedaily.com/releases/2013/04/130407090634.htm
American Association for Cancer Research (AACR). "More accurate markers identified for detecting response to epigenetic drugs for myelodysplastic syndromes." ScienceDaily. www.sciencedaily.com/releases/2013/04/130407090634.htm (accessed July 30, 2014).

Share This




More Health & Medicine News

Wednesday, July 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Health Insurers' Profits Slide

Health Insurers' Profits Slide

Reuters - Business Video Online (July 30, 2014) Obamacare-related costs were said to be behind the profit plunge at Wellpoint and Humana, but Wellpoint sees the new exchanges boosting its earnings for the full year. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
Concern Grows Over Worsening Ebola Crisis

Concern Grows Over Worsening Ebola Crisis

AFP (July 30, 2014) Pan-African airline ASKY has suspended all flights to and from the capitals of Liberia and Sierra Leone amid the worsening Ebola health crisis, which has so far caused 672 deaths in Guinea, Liberia and Sierra Leone. Duration: 00:43 Video provided by AFP
Powered by NewsLook.com
At Least 20 Chikungunya Cases in New Jersey

At Least 20 Chikungunya Cases in New Jersey

AP (July 30, 2014) At least 20 New Jersey residents have tested positive for chikungunya, a mosquito-borne virus that has spread through the Caribbean. (July 30) Video provided by AP
Powered by NewsLook.com
Generics Eat Into Pfizer's Sales

Generics Eat Into Pfizer's Sales

Reuters - Business Video Online (July 29, 2014) Pfizer, the world's largest drug maker, cut full-year revenue forecasts because generics could cut into sales of its anti-arthritis drug, Celebrex. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins