Navigation Links
EGFR protects cancer cells from starvation via a kinase-independent mechanism
Date:5/5/2008

Scientists have uncovered a previously unrealized mechanism by which the epidermal growth factor receptor (EGFR), a tyrosine kinase, promotes survival of cancer cells through a kinase-independent mechanism. The research, published by Cell Press in the May issue of the journal Cancer Cell, provides a rationale for the less than impressive results of recent clinical trials aimed solely at interfering with kinase activity and suggests new directions for potential therapeutic strategies.

The EGFR is closely associated with cell proliferation and survival and excessive expression, and activation of the EGFR is often observed in cancers of epithelial origin. Until now, it was believed that most of EGFRs functions were mediated by its kinase activity, and several compounds that specifically inhibit the kinase activity of the EGFR were developed with the aim of treating these cancers. However, the clinical experience so far has been that blockade of the EGFR tyrosine kinase activity alone does not elicit significant clinical outcomes in most patients.

The expression level of EGFR in cancer tissues is correlated with prognosis, but not with responsiveness to EGFR tyrosine kinase inhibitor treatment, suggesting that, independent of its kinase activity, EGFR may contribute to the progression of cancer, explains study author Dr. Isaiah J. Fidler from the Department of Cancer Biology at The University of Texas M.D. Anderson Cancer Center. Dr. Fidler and colleagues designed a series of studies to investigate the kinase-independent prosurvival function of the EGFR in cancer cells.

The researchers found that the EGFR enables human cancer cells to maintain adequate intracellular glucose levels by stabilizing the sodium/glucose transporter 1 (SGLT1) via a kinase-independent mechanism. Glucose is a major energy substrate for all cells, and without appropriate amounts, cells essentially starve to death through a process called autophagic cell death. Cancer cells are very active metabolically and consume more glucose than normal tissues; moreover, the EGFR overexpression and the associated enhanced stability of SGLT1 allow tumor cells to survive under conditions that would be less than optimal, even for normal cells.

Our results suggest that EGFR, independent of its kinase activity, maintains the basal intracellular glucose level and thereby prevents cancer cells from succumbing to autophagic death. It is possible that this function of the EGFR may even increase the survival capacity of cancer cells in the presence of chemotherapeutic agents, offers study author Dr. Mien-Chie Hung. The researchers suggest that inhibition of both EGFR-mediated SGLT1 stabilization and EGFR kinase activity may be necessary for eradication of epithelial tumors.


'/>"/>

Contact: Cathleen Genova
cgenova@cell.com
617-397-2802
Cell Press
Source:Eurekalert

Related medicine news :

1. What gives us sunburn protects crayfish against bacteria
2. Broccoli sprout-derived extract protects against ultraviolet radiation
3. Early HRT Protects a Womans Heart
4. Regular Walking Protects the Aging Brain
5. Ovary Removal Protects Some High-Risk Women
6. Cell recycling protects tumor cells from anti-cancer therapy
7. Fasting Before Chemo Protects Healthy Cells
8. Injectable Antibiotic Protects Against Lyme Disease in Mice
9. New Drug Protects Against Radiation Damage
10. Gene Variant Protects Black Heart Failure Patients
11. Treating Stomach Infection Early Protects Against Cancer
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/20/2017)... ... 2017 , ... Doctor C LLC, a company based out of Arizona that ... continue the marketing and distribution of its product, The Right C. , The Right ... absorption than traditional vitamin C supplements. At the trade show, Doctor C had the ...
(Date:1/20/2017)... ... January 20, 2017 , ... Michael and Betsy Brauser celebrated ... Institute. For Betsy, the clinical trial has been life-saving as she has been ... , Betsy Brauser was diagnosed with ovarian cancer in 2009. She underwent standard ...
(Date:1/20/2017)... ... ... account following a man who went on to support his country and serve the Lord. ... Haven, Florida and at the age of 5, his family moved to Pensacola Florida. In ... and got married right out of boot camp. , He and his wife raised ...
(Date:1/20/2017)... ... January 20, 2017 , ... “Knowledge is God’s Lighthouse”: a moving ... is God’s Lighthouse” is the creation of published author, Gene Gaapf, a retired truck ... , “I have been writing since high school and have many different titles,” ...
(Date:1/19/2017)... , ... January 19, 2017 , ... Next week after ... be repealed by Congressional political games that circumvent health needs of over 30 million. ... capture the human anxieties and needs government public servants were suppose to prioritize. Interviews ...
Breaking Medicine News(10 mins):
(Date:1/20/2017)... Research and Markets has announced the addition of the ... Amplifiers, Diagnostic Instruments), Sales Volume, Company Analysis and Forecast to ... ... Volume, Company Analysis and Forecast to 2022 provides a comprehensive ... The growing prevalence of hearing impairment coupled with an expanding ...
(Date:1/20/2017)... -- Wells Specialty Pharmacy announces the acquisitions and merger of ... Winter Park, Florida and Pharm-EZ Medical, LLC, ... been consolidated into the 3796 Howell Branch Road Facility. ... Chad Tomlinson , former Vice President of Operations, has ... Tomlinson is a Graduate of Florida State University and has ...
(Date:1/19/2017)... -- Report Details What can be expected ... to grow at the fastest rates? This visiongain report ... opportunities and prospects. Our 190-page report provides 124 ... in the industry and the future market prospects. Our ... all the major categories of the ophthalmic devices market. ...
Breaking Medicine Technology: