Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

A chemotherapy drug packs a one-two punch

22.02.2007
Cancer can be wily, and those who treat the disease have amassed a wide array of weapons with which to fight it and kill tumors. Radiation therapy and various forms of chemotherapy were all thought to be separate but equal treatments.

Now, however, new research is beginning to show that it’s not just killing the cancer cells that matter. How they’re killed may turn out to be just as important and could play a role in marshalling the body’s immune response.

New research by Rockefeller University associate professor Madhav Dhodapkar, head of the Laboratory of Tumor Immunology and Immunotherapy, shows that one form of chemotherapy — a drug called bortezomib — kills tumor cells in such a way that it may allow the immune system to recognize them.

In a first edition paper published online this week by the journal Blood, Dhodapkar, postdoctoral fellow Radek Spisek, and their colleagues show that unlike radiation or other chemical therapies, bortezomib can kill multiple myeloma cells in culture in such a way that it elicits a response by memory and killer T cells. The results suggest the drug has the potential to enhance patients’ immunity to tumors, helping their bodies fight the disease more effectively.

Multiple myeloma is a cancer of immune cells in the bone marrow. Dhodapkar’s experiments show that when treated with bortezomib in tissue culture, multiple myeloma cells die in such a way that a heat shock protein, called hsp90, migrate to their surface. When another group of immune cells, called dendritic cells, encounter hsp90 on the dying tumor cells, the protein acts as a signal for their activation. The dendritic cells then ingest them for presentation to memory and killer T cells, a progression that — in humans — could potentially lead to enhanced immunity. “If you could directly target the drug to these cells,” Dhodapkar says, “it may be sufficient enough to create a vaccine. The exposure of heat shock proteins on dying cells represents an immunogenic form of cell death.”

When the researchers tested other standard treatments for multiple myeloma, such as radiation or the corticosteroid dexamethasone, the therapies failed to increase levels of hsp90 on the surface of dying cells, and so couldn’t activate dendritic cells to the degree that bortezomib did. And their findings aren’t limited to a single cancer: After treatment with bortezomib, dying lymphoma and breast cancer cells experienced the same increase in hsp90.

How well this research will translate to increased survival rates depends on how applicable these tissue culture studies are to the actual immune system response in people. So Dhodapkar plans to determine whether the enhanced T-cell effect he witnessed in tissue culture holds true in patients treated with this drug. If it does, the next move will be to directly target tumors in patients. “A simple experiment that hasn’t been done yet is simply injecting bortezomib directly into tumors. By directly targeting the tumor, rather than injecting the drug intravenously, we may be able to take better advantage of bortezomib’s distinct properties,” he says.

Kristine Kelly | EurekAlert!
Further information:
http://www.rockefeller.edu

Further reports about: Bortezomib Dhodapkar Hsp90 chemotherapy immune cell

More articles from Life Sciences:

nachricht Show me your leaves - Health check for urban trees
12.12.2017 | Gesellschaft für Ökologie e.V.

nachricht Liver Cancer: Lipid Synthesis Promotes Tumor Formation
12.12.2017 | Universität Basel

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Long-lived storage of a photonic qubit for worldwide teleportation

MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.

Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...

Im Focus: Electromagnetic water cloak eliminates drag and wake

Detailed calculations show water cloaks are feasible with today's technology

Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...

Im Focus: Scientists channel graphene to understand filtration and ion transport into cells

Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.

To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...

Im Focus: Towards data storage at the single molecule level

The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.

Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...

Im Focus: Successful Mechanical Testing of Nanowires

With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong

Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

AKL’18: The opportunities and challenges of digitalization in the laser industry

07.12.2017 | Event News

 
Latest News

Long-lived storage of a photonic qubit for worldwide teleportation

12.12.2017 | Physics and Astronomy

Multi-year submarine-canyon study challenges textbook theories about turbidity currents

12.12.2017 | Earth Sciences

Electromagnetic water cloak eliminates drag and wake

12.12.2017 | Power and Electrical Engineering

VideoLinks
B2B-VideoLinks
More VideoLinks >>>