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Dual Inhibitors-Loaded Nanotherapeutics that Target Kinase Signaling Pathways Synergize with Immune Checkpoint Inhibitor

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Abstract

Introduction

Immune checkpoint inhibitors that boost cytotoxic T cell-based immune responses have emerged as one of the most promising approaches in cancer treatment. However, it is increasingly being realized that T cell activation needs to be rationally combined with molecularly targeted therapeutics for a maximal anti-tumor outcome. Currently, two oncogenic drivers, MAPK and PI3K-mTOR have emerged as the two main molecular targets for combining with immunotherapy. However, there are major challenges in enabling such combinations: first, such combinations can result in high rates of toxicity. Second, while, these molecular targets could be driving tumor progression, they are essential for activation of the immune cells. So, the kinase inhibitors and immunotherapy can antagonize each other.

Objectives

We rationalized that the synergistic combination of kinase inhibitors and immunotherapy could be enabled by dual inhibitors-loaded supramolecular nanotherapeutics (DiLN) that can co-deliver PI3K- and MAPK-inhibitors to the cancer cells and activate immune response by T cell-modulating immunotherapy, resulting in greater anti-tumor efficacy while minimizing toxicity.

Methods

We engineered DiLNs by designing the amphiphilic building blocks (both drugs and co-lipids) that enables supramolecular nanoassembly. DiLNs were tested for their physiochemical properties including size, morphology, stability and drug release kinetics profiles. The efficacy of DiLNs was tested in drug-resistant cells such as BRAFV600E melanoma (D4M), Clear cell ovarian carcinoma (TOV21G) cells. The tumor inhibition efficiency of DiLNs in combination with immune checkpoint inhibitor antibody was studied in syngeneic D4M animal model.

Results

DiLNs were stable for over a month and released the drugs in a sustained manner. In vitro cytotoxicity studies in D4M and TOV21G cells showed that DiLNs were significantly more effective than free drugs. In vivo studies showed that the combination of DiLNs with anti PD-L1 antibody resulted in superior antitumor effect and survival.

Conclusion

This study shows that the rational combination of DiLNs that target multiple oncogenic signaling pathways with immune checkpoint inhibitors could emerge as an effective strategy to improve immunotherapeutic response against drug resistant tumors.

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Abbreviations

PI3K:

Phosphoinositide 3-kinase

mTOR:

Mammalian target of rapamycin

MAPK:

Mitogen-activated protein kinase kinase

SNP:

Supramolecular nanoparticles/nanotherapeutics

EGFR:

Epidermal growth factor receptor

D4M:

Dartmouth murine mutant malignant melanoma-3A

Akt:

Protein kinase B

RTK:

Receptor tyrosine kinase

PD-L1:

Programed death ligand 1

MAPK:

Mitogen-activated protein kinases

Erk:

Extracellular signal-regulated kinase

mAb:

Monoclonal antibody

FDA:

Food and drug administration

PD-1:

Programmed death protein 1

CTLA-4:

Cytotoxic T-lymphocyte-associated protein 4

OCCC:

Ovarian clear cell carcinoma

PBMCs:

Peripheral blood monomorphonuclear cells

PBS:

Phosphate buffered saline

TUNEL:

Terminal deoxynucleotidyl transferase (TdT) dUTP nick-end labeling

NiR:

Near infra-red

OCT:

Optimal cutting temperature

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Acknowledgments

We are extremely grateful for the support offered by the Brigham & Women’s Hospital Young Investigator Award, Melanoma Research Alliance Young Investigator Award (510283) and Cancer Research Institute (118-1501) Technology Impact Award to A. K. We would like to thank the BWH animal facility for their help with in vivo imaging. We thank the Biophysical Characterization Core at the Institute for Applied Life Sciences (IALS), University of Massachusetts Amherst for lending their expertise in regards to characterization experiments. We would also like thank Light Microscopy Core facility at University of Massachusetts Amherst for their help and consultation while performing confocal imaging.

Conflict of interest

Anujan Ramesh, Siva Kumar Natarajan, Dipika Nandi and Ashish Kulkarni declare that they have no conflicts of interest.

Research Involving in Human and Animal Studies

All institutional and national guidelines for the care and use of laboratory animals were followed and approved by the appropriate institutional committees. No human studies were carried out by the authors for this article.

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Correspondence to Ashish Kulkarni.

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Ashish Kulkarni is an Assistant Professor in the Department of Chemical Engineering at the University of Massachusetts Amherst. Prior to this, he was an Instructor of Medicine at Harvard Medical School and Associate Bioengineer at Brigham & Women’s Hospital. He obtained his B. Tech. in Chemical Technology from Institute of Chemical Technology, University of Mumbai and a PhD in Chemistry from University of Cincinnati, Ohio. He completed his postdoctoral training with Prof. Shiladitya Sengupta at Harvard Medical School and MIT. In Prof. Sengupta’s laboratory, his research efforts were focused on the development of structure–activity relationship-inspired nanomedicine for cancer therapy. His lab is currently working on the development of tools and platform technologies for immunotherapy applications. His work has been published in Nature Biomedical Engineering, Nature Communications, PNAS, ACS Nano and Cancer Research, and featured in several science media outlets. He was recently selected as one of the top 12 rising researchers (‘Talented 12′) by American Chemical Society’s (ACS) Chemical & Engineering News and ‘NextGen Star’ in Cancer Research by American Association for Cancer Research (AACR). He is a recipient of several awards including American Cancer Society Research Scholar Award, Melanoma Research Alliance Young Investigator Award, Cancer Research Institute Technology Impact Award, Hearst Foundation Young Investigator Award, Harvard Cancer Center Career Development Award, AACR Scholar-in-training Award, American Society of Pharmacology and Experimental Therapeutics (ASPET) Young Scientist Award and Brigham & Women’s Hospital Junior Faculty Mentor Award.

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Ramesh, A., Natarajan, S.K., Nandi, D. et al. Dual Inhibitors-Loaded Nanotherapeutics that Target Kinase Signaling Pathways Synergize with Immune Checkpoint Inhibitor. Cel. Mol. Bioeng. 12, 357–373 (2019). https://doi.org/10.1007/s12195-019-00576-1

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