Navigation Links
Moffitt researchers say effective immunotherapy for melanoma hinges on blocking suppressive factors
Date:12/10/2012

Researchers at the Moffitt Cancer Center have found that delayed tumor growth and enhanced survival of mice bearing melanoma were possible by blocking the reconstitution of myeloid-derived suppressor cells and Tregs (suppressors of anti-tumor activity) after total body irradiation had eliminated them. Blocking myeloid-derived suppressor cells and regulatory T-cell reconstitution improved adoptive T-cell therapy, an immunotherapy designed to suppress tumor activity.

The study appears in the December issue of The Journal of Immunology.

"Melanoma is a leading cause of cancer mortality," said Shari Pilon-Thomas, Ph.D., assistant member of the Immunology Program at Moffitt. "With few nonsurgical options for treating melanoma, immunotherapy, which focuses on the induction of immunity against cancer cells, is a promising approach. However, a major hurdle in developing effective immunotherapies is tumor-induced suppression that can limit the effectiveness of tumor-specific T-cells used in immunotherapy."

Chemotherapy or radiation can induce lymphopenia, the condition of having an abnormally low level of white blood cells. This condition is optimal for adoptive T-cell therapeutic strategies. However, after the induction of lymphopenia, suppressor populations that favor tumor progression begin reconstitution, including regulatory T cells (Tregs) and myeloid derived suppressor cells (MDSC). According to the researchers, tumor-induced suppression can stem from quickly reconstituted Tregs and MDSC.

This knowledge led to their research question, whether blocking the reconstitution of suppressor populations - such as Tregs and myeloid derived suppressor cells - could lead to better immunotherapy in mice bearing melanoma. Mice were treated with docetaxel, a chemotherapeutic drug that targets MDSC, followed by adoptive T cell therapy. In brief, the study demonstrated that when myeloid-derived suppressor cells and Treg reconstitution are blocked, immunotherapy with adoptive T cell transfer is more effective.

"It was important to understand the role of these suppressor populations after the induction of lymphopenia so that we can design more effective immunotherapeutic treatments for melanoma aimed at achieving complete tumor regression," concluded Dr. Pilon-Thomas.


'/>"/>

Contact: Kim Polacek
kim.polacek@moffitt.org
813-745-7408
H. Lee Moffitt Cancer Center & Research Institute
Source:Eurekalert

Related medicine news :

1. Moffitt Cancer Center researchers identify novel metabolic programs driving aggressive brain tumors
2. Moffitt Researchers find genetic predictors of fatigue for some prostate cancer patients
3. Moffitt researcher investigates 2-drug synergy to treat drug-resistant chronic myeloid leukemia
4. Moffitt researchers identify unique immune gene signature across thousands of patients solid tumors
5. Moffitt Cancer Center researcher receives $2.1 million grant from NCI for answering Provocative Question
6. Moffitt cancer center researchers find novel predictor for MDS progression risk
7. Moffitt researchers say race affect likelihood of finding suitable stem cell donor
8. Moffitt Cancer Center researchers study childhood melanoma characteristics
9. Moffitt Cancer Center researchers find acidic pH microenvironments in tumors aid tumor cell survival
10. Review finds some evidence for chemo brain in breast cancer survivors, Moffitt Cancer Center says
11. Moffitt Cancer Center researchers and colleagues identify PHF20, a regulator of gene P53
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:12/9/2016)... ... 09, 2016 , ... MEDI+SIGN®, a provider of fully-automated patient ... solution for Emergency Departments (ED) has been added to their portfolio. Housed in ... rooms, and with a simplified pallet of information available to the patient, the ...
(Date:12/9/2016)... ... 2016 , ... The Pennsylvania Athletic Trainers’ Society (PATS) aired ... of 2016. The program was made possible by a Pennsylvania Department of Health ... and Human Services Administration. The broadcast, Use Your Head: Properly Managing Sport ...
(Date:12/8/2016)... ... 2016 , ... The Florida Hospital Tampa Wound Healing Institute ... (UHMS), the leading authority in hyperbaric medicine. This accreditation identifies the Institute as ... facilities have earned this distinction. This is the second time the Florida Hospital ...
(Date:12/8/2016)... Pennsylvania (PRWEB) , ... December 08, 2016 , ... ... Duck Donuts Franchising Company LLC, announced the first national #QuackGivesBack campaign which ... , “This was our first franchise-wide Quack Gives Back initiative, ...
(Date:12/8/2016)... ... December 08, 2016 , ... ... County, a Property owned by an affiliate of Seavest, has won a prestigious ... Medicine Southern Chester County ambulatory care center (ACC) was named “Best New Development, ...
Breaking Medicine News(10 mins):
(Date:12/8/2016)... , Dec. 8, 2016 Australia Ophthalmic ... new report, "Australia Ophthalmic Lasers Market Outlook to 2022", ... market. The report provides value, in millions of US ... market segements - Excimer Lasers, Femtosecond Lasers and YAG ... distribution shares data for each of these market segements, ...
(Date:12/8/2016)... , Dec. 8, 2016 Global Interventional ... on the global interventional radiology market analyzes the ... report comprises an elaborate executive summary, including a ... segments and sub-segments. The research is a ... formed the bulk of our research efforts along ...
(Date:12/8/2016)... Dec. 8, 2016 Allergy Diagnostics Market: ... and tests that are used to determine the ... milk, or drugs etc. in the samples by ... immune system. The report on global allergy diagnostics ... the market. The report consists of an executive ...
Breaking Medicine Technology: