Scientific publications

MRP1-CD28 bi-specific oligonucleotide aptamers: target costimulation to drug-resistant melanoma cancer stem cells

Soldevilla MM (1,2), Villanueva H (1,2), Casares N (2,3), Lasarte JJ (2,3), Bendandi M (4), Inoges S (2,5), López-Díaz de Cerio A (2,5), Pastor F (1,2).

(1) Program of Molecular Therapies, Aptamer Unit, Centro de Investigación Médica Aplicada (CIMA), Pamplona, Spain.
(2) Instituto de Investigación Sanitaria de Navarra (IDISNA), Recinto de Complejo Hospitalario de Navarra, Irunlarrea, Pamplona, Spain.
(3) Program Immunology and Immunotherapy, Centro de Investigación Médica Aplicada (CIMA), Pamplona, Spain.
(4) Ross University School of Medicine, Roseau, Portsmouth, Commonwealth of Dominica.
(5) Clínica Universidad de Navarra, Pamplona, Spain.

Magazine: Oncotarget

Date: Apr 2, 2016

Cell Therapy Area [SP]

ABSTRACT

In this work we show a clinically feasible strategy to convert in situ the own tumor into an endogenous vaccine by coating the melanoma cancerous cells with CD28 costimulatory ligands.

This therapeutic approach is aimed at targeting T-cell costimulation to chemotherapy-resistant tumors which are refractory and been considered as untreatable cancers.

These tumors are usually defined by an enrichment of cancer stem cells and characterized by the higher expression of chemotherapy-resistant proteins. In this work we develop the first aptamer that targets chemotherapy-resistant tumors expressing MRP1 through a novel combinatorial peptide-cell SELEX.

With the use of the MRP1 aptamer we engineer a MRP1-CD28 bivalent aptamer that is able to bind MRP1-expressing tumors and deliver the CD28 costimulatory signal to tumor-infiltrating lymphocytes. The bi-specific aptamer is able to enhance costimulation in chemotherapy-resistant tumors. Melanoma-bearing mice systemically treated with MRP1-CD28 bivalent aptamer show reduced growth, thus proving an improved mice survival.Besides, we have designed a technically feasible and translational whole-cell vaccine (Aptvax).

Disaggregated cells from tumors can be directly decorated with costimulatory ligand aptamers to generate the vaccine Aptvax. CD28Aptvax made of irradiated tumor cells coated with the CD28-agonistic aptamer attached to MRP1 elicits a strong tumor- cell immune response against melanoma tumors reducing tumor growth.

CITATION  Oncotarget. 2016 Apr 26;7(17):23182-96. doi: 10.18632/oncotarget.8095

you maybe interested

WHAT TECHNOLOGY
DO WE USE?

The Clínica is the greater private hospital with technological equipment of Spain, all in a single center.

Imagen de un PET, tecnología de vanguardia en la Clínica Universidad de Navarra

OUR
PROFESSIONALS

The professionals of the Clínica perform continuous research and training, always to the benefit of the patient.

Imagen profesionales de la Clínica Universidad de Navarra

WHY CHOOSE
THE CLINICA?

Learn why we are different from other healthcare centers. Quality, speed, comfort and results.

Imagen del edificio de la Clínica Universidad de Navarra