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:6/23/2017)... ... ... By scoring 100% for fiscal management and accountability, the Arthritis National Research ... Charity Navigator, validating ANRF's work as a top charity in America. , This achievement ... earns ANRF a spot on their “ 10 Charities Worth Watching ” list as ...
(Date:6/23/2017)... ... June 23, 2017 , ... The Military Officers Association ... for deputy secretary of Veterans Affairs, retired Marine Col. Thomas G. Bowman. , Bowman ... , Bowman brings an intimacy with the issues and challenges veterans face with ...
(Date:6/23/2017)... ... June 23, 2017 , ... Everybody has their own personal preference when ... read it, and some people don't like it at all. FindaTopDoc took a look ... , Erotic literature can give readers a taste of their deepest, darkest fantasies and ...
(Date:6/23/2017)... ... June 23, 2017 , ... Ensuring meat products have reached ... the importance of correctly using a meat thermometer. The videos feature University of ... on consumer food safety habits. Dr. Bruhn explains the variety of meat thermometers ...
(Date:6/23/2017)... FL (PRWEB) , ... June 23, 2017 , ... ... Pinecrest, Florida. This is MD Now’s 28th facility overall and marks the urgent care ... Highway, located one mile North of The Falls shopping mall. The new clinic offers ...
Breaking Medicine News(10 mins):
(Date:5/30/2017)... 2017 DarioHealth Corp. (NASDAQ: DRIO), a leading global digital ... that it will be presenting at the 7th annual LD Micro ... Erez Raphael , CEO, of DarioHealth will be giving the presentation ... on June 6th & 7th, 2017 at the Luxe Sunset Bel ... micro-cap space. About LD Micro ...
(Date:5/30/2017)... , May 30, 2017 Therapix Biosciences ... Company specializing in the development of cannabinoid-based drugs, ... a company overview at three upcoming scientific and ... Annual LD Micro Invitational: ... Date:                     ...
(Date:5/26/2017)... , May 26, 2017  Endo International plc (NASDAQ: ... , President and CEO, will represent the Company in a ... Healthcare Conference on Tuesday, June 13, 2017 at 10:40 a.m. ... at Terranea Resort in Rancho Palos Verdes, CA. ... for the event will be available on the Company,s website ...
Breaking Medicine Technology: