Navigation Links
Cancer cell 'bodyguard' turned into killer
Date:11/25/2008

CORVALLIS, Ore. If you're a cancer cell, you want a protein called Bcl-2 on your side because it decides if you live or die. It's usually a trusted bodyguard, protecting cancer cells from programmed death and allowing them to grow and form tumors. But sometimes it turns into their assassin.

Scientists knew it happened, but they didn't know how to actually cause such a betrayal. Now they do. And it may lead to the development of new cancer-fighting drugs.

Researchers at Oregon State University and the Burnham Institute for Medical Research in La Jolla, Calif., have developed a peptide that converts the Bcl-2 protein from a cancer cell's friend to a foe.

"Now we can force this protein to backstab the cancer cell where it resides," said Siva Kolluri, an assistant professor of cancer biology in the environmental and molecular toxicology department at OSU. He's also the lead author of an article that reported the discovery in the Cancer Cell journal in October.

The key to the conversion is peptide NuBCP-9, a string of nine amino acids that bind to Bcl-2 and attack the mitochondria, the powerhouse of cells. Researchers derived it from Nur77, a nuclear receptor that can cause cells to die. To see if it worked outside the petri dish, researchers injected the peptide and its mirror-image molecule into cancer tumors in mice and found that the cancer cells died and the tumors shrank. To their surprise, they also found that a structurally mirrored-image stable peptide worked as well as the original peptide.

The findings could lead to the development of cancer-fighting drugs that target Bcl-2, Kolluri said. He explained that Bcl-2 is an attractive drug target because its levels are elevated in a majority of human cancers and it is responsible for cancer cells' resistance to many chemotherapeutic drugs and radiation.

Michael Melner, a scientific program director at the American Cancer Society in Atlanta, Ga., said the research Kolluri and his team did "will cause a lot of attention in the cancer field."

"These investigators have done a nice job of combining findings of a basic nature as well as the preliminary studies needed to move to a preclinical evaluation. It's unusual for one single paper to make such a large step forward," he said.

Now one of the next steps, Melner said, is for researchers to determine what types of cancer and what stages of the disease this deadly Bcl-2 converter would combat.

Linda Wolff, a leukemia researcher at the National Institutes of Health's Center for Cancer Research in Bethesda, Md., said the researchers' discovery is "rare" in the world of cancer research. She added that it's important for two reasons.

"First, it may lead to a therapy that could potentially be used against many types of cancer," she said. "The reason for that is because it targets Bcl-2, and Bcl-2 is expressed in many types of cancers. So it could be useful in breast cancer and other carcinomas and leukemia, for example.

"The second reason it's important is that although the peptide they studied causes cancer cells to die, its effect on normal cells seems to be quite minimal," Wolff said. "A big problem in cancer research has been getting therapies that don't kill normal cells."

Dr. David Hockenbery, a member of the Clinical Research Division at the Fred Hutchinson Cancer Research Center in Seattle, Wash., said that this new way of altering a protein so it injures a cell rather than merely disables it "is very unusual." He added that this finding would spur researchers to develop drugs or stable peptides that act on Bcl-2 at the Nur77 binding site.

"Quite conceivably, individual cancers may respond better to one type of Bcl-2 inhibitor than another," he said. "In the future, the availability of several targeting approaches against Bcl-2 should be useful in personalized cancer therapies."


'/>"/>

Contact: Siva Kolluri
siva.kolluri@oregonstate.edu
541-737-2940
Oregon State University
Source:Eurekalert

Related biology news :

1. Green tea boosts production of detox enzymes, rendering cancerous chemicals harmless
2. A study by the MUHC and McGill University opens a new door to understanding cancer
3. ESF EURYI award winner aims to stop cancer cells reading their own DNA
4. Protein chatter linked to cancer activation
5. Newly created cancer stem cells could aid breast cancer research
6. Western diet linked to increased risk of colon cancer recurrence
7. Obesity and lack of exercise could enhance the risk of pancreatic cancer
8. Low levels of key protein may indicate pancreatic cancer risk
9. Birth records hold pancreatic cancer clue
10. Many parents at-risk for cancer disclose genetic test results to children
11. A new radiation therapy treatment developed for head and neck cancer patients
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/12/2016)... 12, 2016 WearablesResearch.com , a brand ... overview results from the Q1 wave of its quarterly ... was consumers, receptivity to a program where they would ... health insurance company. "We were surprised to ... Michael LaColla , CEO of Troubadour Research, "primarily ...
(Date:4/26/2016)... and LONDON , ... Finacle, part of EdgeVerve Systems, a product subsidiary ... Onegini today announced a partnership to integrate the ...      (Logo: http://photos.prnewswire.com/prnh/20151104/283829LOGO ) ... provide their customers enhanced security to access and ...
(Date:4/14/2016)... 2016 BioCatch ™, the ... announced the appointment of Eyal Goldwerger as ... Goldwerger,s leadership appointment comes at a time of ... deployment of its platform at several of the world,s ... discerns unique cognitive and physiological factors, is a winner ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... ... June 23, 2016 , ... ... announce the launch of their brand, UP4™ Probiotics, into Target stores nationwide. The ... is proud to add Target to its list of well-respected retailers. This list ...
(Date:6/23/2016)... , June 23, 2016 Houston Methodist ... the Cy-Fair Sports Association to serve as their ... agreement, Houston Methodist Willowbrook will provide sponsorship support, ... connectivity with association coaches, volunteers, athletes and families. ... the Cy-Fair Sports Association and to bring Houston ...
(Date:6/23/2016)... SAN FRANCISCO , June 23, 2016   ... it has secured $1 million in debt financing from ... to ramp up automation and to advance its drug ... for its new facility. "SVB has been ... goes beyond the services a traditional bank would provide," ...
(Date:6/23/2016)... , June 23, 2016 Apellis Pharmaceuticals, ... 1 clinical trials of its complement C3 inhibitor, ... and multiple ascending dose studies designed to assess ... of subcutaneous injection in healthy adult volunteers. ... either as a single dose (ranging from 45 ...
Breaking Biology Technology: