Review Article |
Corresponding author: Alexandre Loukanov ( loukanov@gunma.kosen-ac.jp ) Academic editor: Plamen Peikov
© 2022 Alexandre Loukanov, Ayano Kuribara, Chavdar Filipov, Svetla Nikolova.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Loukanov A, Kuribara A, Filipov C, Nikolova S (2022) Theranostic nanomachines for cancer treatment. Pharmacia 69(2): 285-293. https://doi.org/10.3897/pharmacia.69.e80595
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Multifunctional programmed nanomachines with theranostic functions demonstrated great potential in the clinical practice of oncology, as well as the personalized nanomedicine. The reason is because such nanoagents with combined diagnostic and therapeutic functions were found to be highly effective for cancer treatment. The appropriate design of nanomachines allows them to overcome the biological barriers of proliferative tumors and to distinguish the cancer cells from their normal counterparts. Moreover, the use of biocompatible and biodegradable precursors for construction of nanomachines minimize significantly the caused adverse effects to the normal tissue cells, which is a main problem of the chemotherapy. In addition, the utilization of theranostic nanomachines also enables an improved selectivity to the cancer in respect to its intrinsic complexity, heterogeneity, and dynamic evolution. Here we present the programmable functions and performance of the microenvironment-responsive nanomachines at a molecular level for cancer imaging and therapy.
Multiparameter theranostic nanomachines, nanoscale mechanical devices, nanoscale manipulation
The progress of nanomedicine emerges the transition of conventional to personalized treatments and it is expected to have a great impact on the precision health care in near future (
The aptamers are single-stranded RNA or DNA oligonucleotides which have binding and selection affinity to distinguish cancer cells comparable to that of antibodies. They can covalently conjugate to small-molecule drugs (such as doxorubicin), unnatural peptides (Sofroniev and Mintchev et al. 1986; Minchev 1988), biotoxin or radioactive element tags and successfully target the cancer cells with simultaneously improved delivery efficiency and reduced side effects. The therapeutic aptamers may inhibit the activity of cellular receptors and dozens of them are already approved in clinical trials for synergistic treatment of tumors with conventional chemotherapy, thrombosis prevention or immune modulation (
DNA programmed nanorobot functionalized with aptamers for targeting and binding to protein biomarkers expressed on the tumor-associated endothelial cells. The attached antibodies are the key for the mechanism to open the tubular-origami shape and performing of massive blood coagulation at the tumor site.
A multi-parameter DNA-based logic platform have been designed as a base to develop programmable nanomachines for precise targeting and recognition of cancer cells through identification of high-order multiple markers (
A new class antibody-powered DNA-based nanomachine was demonstrated for controlled drug-release, point-of-care diagnostics, and in vivo imaging application (
By the end of 2020 about one thousand nanomaterials have been reported to mimics the mechanisms and biofunctions of natural enzymes. They are called nanozymes. The nanozymes possess unique properties, which provide ideas and platform for creative designs and fabrication of novel theranostic nanomachines. For example, the carbon nanodots-based nanozymes may successfully simulated the structure and function of natural enzymes such as oxidase (
Other multishape nanozymes have also been designed for therapeutic applications, such as core-shell, Janus, yolk-shell, bowl-like or alloy structures. Janus nanomotors are defined as asymmetrical particles with various physical or chemical properties on different hemispheres. Multifunctional Janus nanomachines provide synergistic effects by concentrating multiple properties on a single carrier (
A theranostic DNA nanomachine has been designed, which can simultaneously target, report, and cleave specific RNA at conditions near to the physiological one (
Design of the theranostic nanomachine for targeting and cleavage of RNA. Reaction 1: the nanomachine strand with Dz1 catalytic core (deoxyribozyme) bind to a specific site of the target RNA by Watson-Crick base pairing and cleave the chain. Reaction 2: a binary sensor hybridizes in complementary approach to form Dz2 core, which is able to react with a fluorescent reporter. Reaction 3: Dz2 core cleaves the fluorescent reporter and induces a fluorescent signal with increased intensity.
The assembly of gold nanoparticles (Au NPs) through dynamic DNA-fueled molecular machines can be powerful platform for developing of theranostics medication. In such nanomachine, the aggregation of DNA-functionalized Au NPs may be regulated by a series of strand displacement reactions. The DNA-linkers provide connection between the individual Au NPs and thus numerous nanodevices with unique properties and functions might be fabricated. Such innovative design of a theranostic nanomachine made from gold nanoparticles conjugated to single-stranded DNA (ss DNA) oligonucleotides have been reported (
Schematic illustration of: (A) aggregate formation of gold nanoparticles coated with complementary ss DNA strands; (B) single dispersed gold nanoparticles coated with ss DNA strands and protected with alpha-cyclodextrin to avoid aggregation; and (C) tumor-specific photoacoustic imaging and photothermal therapy.
In the clinical application it must be taken under consideration the stability of the oligonucleotide chain against the presence of deoxyribonucleases enzymes (DNases). DNases might degrade the “intruder” DNA and thus abolish the functionality of the nanomachine (
The promising development in nanotechnology-based theranostics can completely change our targeted drug delivery approach. Over the past decade, significant research efforts have been focused on the design of nanomaterials whose properties and, therefore, behavior is regulated in a programmable fashion. Nowadays, the highly programmed nanomachines are able to identify the challenging cellular targets and to release drugs in a precisely regulated fashion, as well as to broadcast the information about the local microenvironment. In this respect, there is a great interest and significant development progress of those task-specific nanodevices into an all-in-one theranostic platform to afford powerful nanomachines that surpass all state-of-the-art drugs.
The authors are thankful to MEXT/JSPS KAKENHI Grant Number 20K05260 and Jikoshunyu Kyoin-haibun-keihi № T5452 projects for the funding of our research in the field of nanomachines and nanorobots.