Navigation Links
Functional characteristics of antitumor T cells change w increasing time after therapeutic transfer
Date:3/21/2013

PHILADELPHIA Scientists have characterized how the functionality of genetically engineered T cells administered therapeutically to patients with melanoma changed over time. The data, which are published in Cancer Discovery, a journal of the American Association for Cancer Research, highlight the need for new strategies to sustain antitumor T cell functionality to increase the effectiveness of this immunotherapeutic approach.

Early clinical research has indicated that cell-based immunotherapies for cancer, in particular melanoma, have potential because patients treated with antitumor T cells frequently have an initial tumor response; however, those responses are often transient.

"The cell-based immunotherapy we utilized was that of genetically engineered T cells," said James R. Heath, Ph.D., Elizabeth W. Gilloon Professor of Chemistry at the California Institute of Technology in Pasadena, Calif. "This approach is the most widely applicable way to generate large numbers of highly functional antitumor T cells."

Different T cell functions are associated with distinct proteins. Heath and colleagues took a closer look at how genetically engineered T cells functioned or failed after being transferred into patients. To do this, they used a recently developed, multiplexed technology that gave them a high-resolution view of which function-associated proteins individual cells expressed.

The researchers analyzed T cells isolated from blood samples taken from three patients with melanoma at several time points after treatment with genetically engineered antimelanoma T cells. Each of the patients from whom samples were taken had exhibited a different level of response to the immunotherapy.

The most highly functioning genetically engineered antimelanoma T cells made up about 10 percent of the total population of transferred T cells.

"However, they dominated the immune response," Heath said. "In other words, 10 percent of the cells are putting out 100 times more protein than the other cells."

Although these highly functioning genetically engineered T cells had high tumor-killing capabilities when a patient first received them, those capabilities disappeared within two to three weeks.

"The genetically engineered T cells did recover their high functional capacity, but those functions no longer included tumor-killing," Heath said. "However, there was another population of T cells that emerged at around one month that did exhibit tumor-killing characteristics."

These new T cells appeared to be a byproduct, through a process known as epitope spreading, of the original genetically engineered, tumor-killing T cells the patient received, Heath explained. The researchers also discovered one potential cause for the transient response to T cell therapy. Results showed that as the patient's own immune system recovered, after its initial depletion prior to therapy, those recovering T cells appeared to inhibit the antitumor immune response.


'/>"/>

Contact: Jeremy Moore
jeremy.moore@aacr.org
215-446-7109
American Association for Cancer Research
Source:Eurekalert

Related medicine news :

1. SiliconMesa Partners with DrFirst to Add E-prescribing and Medication Adherence Functionality to SiliconMesa EHR
2. Patient Prompt Announces Advanced Text Messaging Functionality at 2013 Annual AMGA in Orlando, Florida
3. Researchers Describe 1st Functional Cure of HIV in Baby
4. Functional electrical stimulation cycling promotes recovery in chronic spinal cord injury
5. Toddler functionally cured of HIV infection, NIH-supported investigators report
6. Researchers describe first functional HIV cure in an infant
7. Gut microbiota plays important role in functional bowel disorders
8. Does the functionality of your small finger determine your ability to master the violin?
9. Easy On Hold Reviews Latest Small Business Phone Systems for Music On Hold Ease and Functionality
10. Popular Medical Tourism Portal, myMEDholiday.com, Expands Its Functionality by Adding RSS Feeds
11. Noise protection - multifunctional and aesthetical
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/12/2016)... ... February 12, 2016 , ... Mystic Buddha Publishing House presents Valentine’s Day tips ... biography of Rama - Dr. Frederick Lenz. , According to Publisher Roger ... Buddhist teacher for teaching and helping others. Valentine’s Day celebrates love in all ...
(Date:2/12/2016)... VA (PRWEB) , ... February 12, 2016 , ... CDRH Enforcement Trends: , Back to ... , As Winston Churchill said, “Those who don’t learn from history ... show what to expect when they come knocking this year. But that takes time. ...
(Date:2/12/2016)... California (PRWEB) , ... February 12, 2016 , ... Coco ... their participation in Red Carpet Events LA GRAMMY’s Style Lounge Event. Coco Libre will ... way to stay hydrated before the big event. The invitation-only gifting suite, held this ...
(Date:2/12/2016)... ... ... Every winter, someone is killed, injured or loses a home in an ... part of the Allegheny Health Network, has partnered with Etna Volunteer Fire Department, and ... campaign. , “Space Heaters Need Space” aims to bring awareness to the ...
(Date:2/12/2016)... ... , ... Vail knee specialist Robert LaPrade, MD, PhD was named ... list consists of physicians establishing, leading and partnering with ambulatory surgery centers across the ... Surgery Center, also known as an ASC, is a modern health care facility focused ...
Breaking Medicine News(10 mins):
(Date:2/12/2016)... SAO PAULO , Feb. 12, 2016 /PRNewswire/ ... has commenced a cash tender offer (the "Tender ... U.S.$312.6 million outstanding aggregate principal amount of its ... P5246AAF0 and ISIN Nos. US44915JAA88/ USP5246AAF05) (the "Notes"). ... also soliciting (the "Consent Solicitation") consents (the "Consents") ...
(Date:2/12/2016)... --  HeartWare International, Inc . (NASDAQ: HTWR ) ... its financial results for the three and 12 months ... at 8:00 a.m. ET.  The company plans to release ... webcast.  On the conference call and webcast, management will ... quarter and business outlook.   --> ...
(Date:2/12/2016)... , Feb. 12, 2016 On Thursday, Feb. ... Surgery at St. David,s North Austin Medical Center successfully ... ® Xi ® Surgical System with Trumpf ... Thiru Lakshman , M.D., colorectal surgeon at ... proctocolectomy utilizing Integrated Table Motion technology, which seamlessly combines ...
Breaking Medicine Technology: