Artificial antigen presenting cells

Artificial antigen presenting cells (aAPCs) are a new technology and approach to cancer immunotherapy. Immunotherapy aims to utilize the body’s own defense mechanism—the immune system—to recognize mutated cancer cells and to kill them the way the immune system would recognize and kill a virus. Antigen presenting cells are the sentinels of the immune system and patrol the body for pathogens. When they encounter foreign pathogens, the antigen presenting cells alert the T cells—“the soldiers of the immune system”—that there is something foreign in the body with specific cell surface molecules. aAPCs are synthetic versions of these sentinel cells and are made by attaching the specific T-cell stimulating signals to various macro and micro biocompatible surfaces. This can potentially reduce the cost while allowing control over generating large numbers of functional pathogen-specific T cells for therapy. Activated and stimulated T cells can be studied in this biomimetic contex and used for adoptive transfer as an immunotherapy.

Essential components of an aAPC

Signal 1

A general schematic of an artificial antigen presenting cell (aAPC). aAPCs are made by conjugating both T cell stimulatory Signals to material platforms.

Modeled after APCs, aAPCs need to have at least two signals to stimulate antigen specific T cells. The first signal is the major histocompatibility complex (MHC), which in humans is also called the human leukocyte antigen (HLA). This is the molecule which is loaded with the specific antigen. MHC class I are found on all cells and stimulate cytotoxic T cells (CD8 cells), and MHC class II are found on APCs and stimulate helper T cells (CD4 cells). It is the specific antigen or epitope that is loaded into the MHC determines the antigen-specificity. The peptide-loaded MHC engages with the cognate T cell receptor (TCR) found on the T cells.

Signal 2

T cells need another signal to become activated in addition to Signal 1, this is done by co-stimulatory molecules such as the proteins CD80 (B7.1) or CD86 (B7.2), although other additional co-stimulation molecules have been identified. When Signal 2 is not expressed, but T cells receive Signal 1, the antigen-specific T cells become anergic and do not perform effector function.

Signal 3

Signal 3 is the APC secretion of stimulatory cytokines such as IL-2 which enhances T cell stimulation, though this is not required for T cell activation.

Types of aAPCs

Cell-based aAPCs have been produced by transfecting murine fibroblasts to express specific peptide-loaded HLA molecules with co-stimulatory signal B7.1, and cell adhesion molecules ICAM-1 and LFA-3.^[1]

Many microparticle systems have been developed as microparticles represent physiologically similar sizes to cells. Microparticle curvature and shape has also been shown recently to play an important role in effective T cell stimulation.^[2]

Nanoparticles have also recently been used. Nanoparticles have the additional advantage of enhanced transport once injected into the body as compared to microparticles. Nanoparticles are able to be transported through the porous extracellular matrix much easier and reach the lymph nodes where the T cells reside.^[3] Also, iron oxide nanoparticles have been used to take advantage of the superparamagnetic properties and to cluster both Signals to enhance T cell stimulation.^[4]

Materials which have been used include poly (glycolic acid), poly(lactic-co-glycolic acid), iron-oxide, liposomes, lipid bilayers, sepharose, and polystyrene.^[5]

Uses

aAPCs remove the need to harvest patient specific APCs such as dendritic cells (DCs) and the process of activating the DCs in the stimulation of antigen-specific T cells. As specific cancer antigens have been discovered, these antigens can be loaded to aAPCs to successfully stimulate and expand tumor-specific cytotoxic T cells. These T cells can be then re-infused or adoptively transferred into the patient for effective cancer therapy. This technology is currently being tested within laboratories for potential use in cancer therapy and to study the mechanisms of endogenous APC signaling.

References

1. "Induction of human cytotoxic T lymphocytes by artificial antigen-presenting cells." Nature biotechnology 18, no. 4 (2000): 405-409.
2. "Particle shape dependence of CD8+ T cell activation by artificial antigen presenting cells." Biomaterials 35, no. 1 (2014): 269-277.
3. "Nanoscale artificial antigen presenting cells for T cell immunotherapy." Nanomedicine: Nanotechnology, Biology and Medicine 10, no. 1 (2014): 119-129.
4. "Magnetic field-induced T cell receptor clustering by nanoparticles enhances T cell activation and stimulates antitumor activity." ACS nano 8, no. 3 (2014): 2252-2260.
5. "Linking form to function: Biophysical aspects of artificial antigen presenting cell design." Biochimica et Biophysica Acta (BBA)-Molecular Cell Research (2014):Sep 6. pii: S0167-4889(14)00326-7. doi: 10.1016/j.bbamcr.2014.09.001.