Navigation Links
MicroRNA molecule may serve as biomarker, target for brain metastases in breast cancer patients
Date:2/5/2013

PHILADELPHIA Researchers have identified two molecules that could potentially serve as biomarkers in predicting brain metastases in patients with breast cancer, according to data published in Cancer Research, a publication of the American Association for Cancer Research.

Currently, most deaths from breast cancer are a result of metastatic disease. New research shows that cancer stem-like cells commonly defined as cells within a tumor with the capacity to initiate a new tumor, proliferate rapidly, differentiate and cause chemotherapy resistance may play a role in breast cancer metastasis.

"Recent research has shown that microRNAs are involved in tumor initiation and progression, and we hypothesized that they also may play a role in metastasis, particularly in relation to cancer stem-like cells," said Kounosuke Watabe, Ph.D., associate director for basic science at the University of Mississippi Medical Center in Jackson, Miss.

Watabe and colleagues performed microRNA profile analysis on RNA extracted from cancer stem-like cells isolated from a human breast cancer cell line and two highly metastatic variants of this cell line.

"We found that miR-7 is a metastasis suppressor in cancer stem-like cells," Watabe said. "When we increased expression of miR-7 in cancer stem-like cells from metastatic human breast cancer cell lines, it suppressed their metastatic properties."

Next, the researchers examined the molecular pathway downstream of miR-7 to find its targets and discovered that miR-7 suppressed expression of KLF4.

"High expression of KLF4 was inversely associated with brain metastasis-free survival but was not associated with bone metastasis," Watabe said. "This was confirmed in an animal model when we found that expression of miR-7 significantly suppressed the ability of cancer stem-like cells to metastasize to the brain but not the bone."

Finally, the researchers tested tumor samples from patients with breast cancer whose disease metastasized to the brain. Results showed that miR-7 was downregulated and KLF4 was upregulated. The miR-7/KLF4 axis played a critical role in cancer stem-like cell brain metastasis, according to Watabe.

Few treatments currently exist for brain metastasis because few drugs can penetrate the bloodbrain barrier, which prevents chemotherapy from reaching the brain.

"Cancer cells find the brain to be a kind of sanctuary where they can survive longer," Watabe said. "It is possible that miR-7 and KLF4 may serve as diagnostic or prognostic markers, or therapeutic targets for the prediction of, or treatment of, brain metastasis."


'/>"/>

Contact: Jeremy Moore
jeremy.moore@aacr.org
215-446-7109
American Association for Cancer Research
Source:Eurekalert

Related medicine news :

1. A microRNA prognostic marker identified in acute leukemia
2. Pint-size microRNAs show promise against weighty problem, researchers say
3. MicroRNAs can convert normal cells into cancer promoters
4. Hepatitis B virus promotes oncogenesis through microRNA modulation
5. Molecule movements that make us think
6. Prions in the brain eliminated by homing molecules
7. Researchers identify a life-and-death molecule on chronic leukemia cells
8. Inhibitors of shuttle molecule show promise in acute leukemia
9. Mayo Clinic: Molecule thought cancer foe actually helps thyroid tumors grow
10. Cleveland Clinic researchers discover molecule that may prevent atherosclerosis
11. Molecule found that inhibits recovery from stroke
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/22/2017)... ... ... Walk Away”: a captivating and romantic sequel to the romantic story of a ... creation of published author, Larry R. Sherman, a retired chemistry professor from the University ... well as four novels. , Though the book opens in 1947, when Edward ...
(Date:8/22/2017)... ... ... “Glimpses Of Light”: is a unique and thought inspiring guide toward self-discovery and ... author, J.M. Shepherd, a writer, teacher, traveler, and metaphysician, the author has spent most ... “Love is one of the least understood and yet most sought-after pleasures known to ...
(Date:8/22/2017)... (PRWEB) , ... August 22, 2017 , ... Although Labor ... of July, many communities have begun providing weekend displays, and numerous households celebrate the ... humans, they can be downright terrifying for pets. , Kris Zambo, owner of ...
(Date:8/21/2017)... ... 21, 2017 , ... Los Angeles area medical group Beverly ... year 2017-2018, Christina M. Busuito, M.D. and Lukasz Swistun, M.D. This one year ... Reconstructive Surgery. The candidate will have the opportunity to work with leading ...
(Date:8/21/2017)... ... 2017 , ... Marathon running has surged in popularity in ... running increases exposure to ultraviolet radiation, a carcinogen that promotes skin cancer. Studies ... half may be adequately protecting themselves with proper clothing and sunscreen. , ...
Breaking Medicine News(10 mins):
(Date:8/4/2017)... Aug. 3, 2017  Agragen, LLC, a ... in the biopharmaceutical, nutraceutical, and aquacultural feed sectors, ... its lead drug candidates, AGR131.  This drug is ... from the blood of patients suffering from inflammatory ... bowel disease. ...
(Date:8/2/2017)... Aug. 2, 2017 CaryRx, a next-generation full-service pharmacy, ... service for patients in the Washington D.C. ... pharmacy by providing delivery of medications through the convenience of ... delivery or delivered within one hour to any location in ... to bring this invaluable service to Washington D.C. ...
(Date:7/28/2017)... 2017 Hill-Rom Holdings, Inc. ("Hill-Rom") (NYSE: HRC), ... ended June 30, 2017, and updated its financial outlook ... For the fiscal third quarter, Hill-Rom reported earnings ... diluted share in the prior-year period. These results reflect ... diluted share primarily related to the non-cash write-down of ...
Breaking Medicine Technology: