Navigation Links
Stress may hasten the growth of melanoma tumors
Date:1/30/2009

COLUMBUS, Ohio For patients with a particularly aggressive form of skin cancer malignant melanoma stress, including that which comes from simply hearing that diagnosis, might amplify the progression of their disease.

But the same new research that infers this also suggests that the use of commonly prescribed blood pressure medicines might slow the development of those tumors and therefore improve these patients' quality of life.

The study, the third by Ohio State University scientists in the last two years that looked for links between stress hormones and diseases like cancer, is published in the the journal Brain, Behavior and Immunity.

Eric V. Yang, a research scientist at the Institute for Behavioral Medicine Research (IBMR), exposed samples of three melanoma cell lines to the compound norepinephrine, a naturally occurring catecholamine that functions as a stress hormone. In times of increased stress, levels of norepinephrine increase in the bloodstream.

Yang and colleague Ronald Glaser were looking for changes in the levels of three proteins released by the cells. Glaser is a professor of molecular virology, immunology and medical genetics, member of the university's Comprehensive Cancer Center and director of the IBMR.

One of the proteins vascular endothelial growth factor, or VEGF plays a key role in stimulating the growth of new blood vessels needed to feed a growing tumor, a process called angiogenesis. The other two proteins, Interleukin-6 and Interleukin-8, are both involved in fostering tumor growth.

All three of the cell lines were grown from tissues taken from secondary tumors that had metastasized from a primary site and they signify aggressive forms of cancer. But one of them C8161 represented the most aggressive and advanced form of melanoma.

"We noticed that all three of these proteins increased in response to the norepinephrine," Yang explained, adding that in the C8161 cells, "we got a 2,000 percent increase in IL-6. In untreated samples from this cell line, you normally can't detect any IL-6 at all.

"What this tells us is that stress might have a worse effect on melanoma that is in a very aggressive or advanced stage, and that one marker for that might be increased levels of IL-6," he said.

The researchers ruled out cell proliferation an increase in the number of cells present as a reason for the increase in all three proteins. That meant that the only other answer was that the cells were increasing their expression of the genes responsible for producing these compounds.

The researchers showed that the norepinephrine molecule binds to receptors on the surface of cancer cells and once this linkage occurs, it stimulates the release of the proteins that support angiogenesis and tumor growth.

Yang and Glaser first confirmed that the receptors were present on cells in all three cell lines and then tested what would happen when the receptors were blocked by common blood pressure medicine the so-called "beta-blockers."

When the beta-blockers did bind to the receptors, the production of the three proteins reduced significantly, suggesting that in patients with melanoma, using these types of medications might be used to slow the progression of the disease in patients.

While the study was restricted to tumor cell lines, rather than using animal models or human patients, the findings are still exciting. The researchers found strong evidence that the same receptors are expressed on the surface of tumor cells from biopsies that were taken from melanoma patients. That supports the clinical importance of the results.

Two earlier studies on different tumor cell lines one prepared from a multiple myeloma and the other from a nasopharyngeal carcinoma also showed that exposure to norepinephrine increased the levels of proteins responsible for accelerating tumor growth.

The research is showing not only that different forms of cancer react differently to stress hormones but also that those reactions can vary within a specific form of the disease, with the possibility of a more aggressive form of the disease reacting more strongly to the stressors.

For melanoma patients, that can be very important since these tumors are able to metastasize, or spread, when they are much smaller than most other solid cancers. The American Cancer Society estimates that nearly 48,000 cases of melanoma are diagnosed each year and nearly 8,000 people are killed each year by the disease.


'/>"/>

Contact: Ronald Glaser
glaser.1@osu.edu
614-292-5526
Ohio State University
Source:Eurekalert

Related biology news :

1. Stress disrupts human thinking, but the brain can bounce back
2. Understanding how oxidative stress impairs endothelial progenitor cell function
3. Children distressed by family fighting have higher stress hormones
4. In child care, relationships with caregivers key to childrens stress levels
5. Stress may make you itch
6. Exposing chicks to maternal stress leads to long-term reproductive success
7. University professor stresses links between US Navy sonar and whale strandings
8. Plants in forest emit aspirin chemical to deal with stress; discovery may help agriculture
9. Early parenting plays key role in infants physiological response to stress
10. Oxidative stress: Mechanism of cell death clarified
11. Water: stressed-out and overheated
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/15/2016)... 2016 Recent publicized breaches in cyber security ... ways to ensure data security and user authentication in ... Android that ties a user,s mobile number ... a hardware authorization token. Customer service agents who employ ... their KodeKey enabled device to verify their identity.  Companies ...
(Date:1/11/2016)... 11, 2016 Synaptics Incorporated (NASDAQ: SYNA ... announced that its ClearPad ® TouchView ™ ... two separate categories in the 8 th Annual ... Technology Breakthrough. The Synaptics ® TDDI solution enables ... chain, thinner devices, brighter displays and borderless designs. ...
(Date:1/8/2016)... NXTD ), a company focused ... a privately held leading direct seller of vacation and ... fastest-growing company announced that on December 31, 2015, that ... Nxt-ID to develop a proprietary new wireless smart card ... a unique smart wallet that serves to securely store ...
Breaking Biology News(10 mins):
(Date:2/4/2016)... (PRWEB) , ... February 04, 2016 , ... ... talent development and compliance training, today announced an interactive FDA compliance training ... The RAPS (Regulatory Affairs Professional Society) accredited interactive course on Morf Playbook—now ...
(Date:2/4/2016)... -- Beike Biotechnology, the Shenzhen ... in late 2015 to mark their successful combined efforts ... --> --> The signing, ... Therapy" was hosted by the Shenzhen Cell Bank and ... Beike Biotechnology Co., Ltd. Shenzhen,s ...
(Date:2/4/2016)... , Feb. 4, 2016  Spherix Incorporated (Nasdaq: ... fostering and monetization of intellectual property, today provided an ... in the Northern District of Texas ... Inter Partes Re-examination ("IPR") proceedings ... Office.  The IPR was initiated on only certain claims ...
(Date:2/3/2016)... , Feb. 3, 2016   ViaCyte, Inc ... the first pluripotent stem cell-derived islet replacement therapy ... clinical-stage development, today announced that ViaCyte and Janssen ... of Johnson & Johnson, have agreed to consolidate ... ViaCyte.  The agreement provides ViaCyte with an exclusive ...
Breaking Biology Technology: