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Biomedical Nanosystems for In Vivo Detoxification: From Passive Delivery Systems to Functional Nanodevices and Nanorobots
T. N. Pashirova1*, Z. M. Shaihutdinova1,2, V. F. Mironov1, P. Masson2
1Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, Kazan, 420088 Russian Federation
2Kazan (Volga Region) Federal University, Kazan, 420008 Russian Federation *E-mail: [email protected]
Received February 15, 2023; in final form, March 21, 2023 DOI: 10.32607/actanaturae.15681
Copyright © 2023 National Research University Higher School of Economics. This is an open access article distributed under the Creative Commons Attribution License,which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
ABSTRACT The problem of low efficiency of nanotherapeutic drugs challenges the creation of new alternative biomedical nanosystems known as robotic nanodevices. In addition to encapsulating properties, nanodevices can perform different biomedical functions, such as precision surgery, in vivo detection and imaging, biosensing, targeted delivery, and, more recently, detoxification of endogenous and xenobiotic compounds. Nanodevices for detoxification are aimed at removing toxic molecules from biological tissues, using a chemical- and/or enzyme-containing nanocarrier for the toxicant to diffuse inside the nanobody. This strategy is opposite to drug delivery systems that focus on encapsulating drugs and releasing them under the influence of external factors. The review describes various kinds of nanodevices intended for detoxification that differ by the type of poisoning treatment they provide, as well as the type of materials and toxicants. The final part of the review is devoted to enzyme nanosystems, an emerging area of research that provides fast and effective neutralization of toxins in vivo.
KEYWORDS detoxification, nanodevices, delivery systems, enzyme.
ABBREVIATIONS LE - lipid emulsions; RM-PL - erythroliposome; LSPD - peritoneal dialysis with liposomes; OP - organophosphorus compounds; E - enzyme; T - toxicant.
INTRODUCTION
For a long time, human disease prevention and treatment had mostly been based on the administration of chemical or biological drugs. Since the discovery of first liposomal systems in 1964, the current nano-medicine strategy has focused on encapsulating and stabilising small molecule drugs or macromolecules in various types of nanocarriers to overcome biological barriers, increase bioavailability, reduce unwanted toxicity to healthy tissues, and target delivery [1, 2]. Despite the fact that a number of nanotherapeutic drugs have already been approved for clinical uses and/or are undergoing clinical studies [3, 4], nanomed-icine still faces low efficiency in many for example, only 0.7% of cytotoxic drugs encapsulated into nano-carriers reach solid tumors [5]. Since 2008, there has been a significant increase in publications describing the production of new-generation nanotherapeu-
tic drugs called "smart nanocarriers" that have been modified with various ligands to provide targeted delivery and sensitivity to various stimuli [6, 7].
Today, there is a demand for alternative biomedical systems such as robotic nanodevices. Unlike traditional passive nanotherapeutic drugs, these robotic nanodevices perform various biomedical functions, including precision surgery, biosensing, in vivo detection and imaging, targeted drug delivery, and, recently, detoxification [8, 9]. For a long time, nanorobot-ics remained a fantasy. The concept of microscopic mechanical surgeons moving through a blood vessel was first put forward in 1959 by Richard Feynman, a Nobel Prize winner in physics. Shortly after, in 1966, the concept of "surgeon" was introduced in the science fiction film Fantastic Voyage. In the film, a miniature submarine was used to remove a clot from a blood vessel. Over the past few decades, science fiction has
become a reality. Nanodevices of various shapes and sizes have been developed using different types of materials, technologies, and control methods. They are often referred to as micro/nanomotors [10], micro/nano swimmers [11], micro/nano machines [12], micro/nano pumps [13], micro/nano rockets [14], etc [15].
There are many definitions for nanodevices. Nanomachines are nanoscale mechanical devices able to transform energy into precise mechanical motion [16]. Micro/nano biomedical devices often characterize structures that can be controlled and propelled within a living organism through chemical or bio-hybrid sources [17]. They are tiny nanomaterial-based integrated structures engineered in a way so that they can move autonomously and perform programmed tasks efficiently even at hard-to-reach organ/tissues/ cellular sites [18]. In summary, robotic nanodevices are next-generation tools propelled and/or guided by endogenous and exogenous stimuli for targeted and personalized therapeutic applications. However, their use for practical clinical applications is still in its infancy [19]. For the development and successful applications and clinical use of biomedical therapeutic nanodevices, the following key factors must be considered:
• biocompatibility with the patient's body;
• ability to load/release drugs, imaging agents, etc.;
• motion control and tracking in real time using medical imaging techniques;
• controlled degradation without any toxic metabolite
formation in the patient's body.
The nomenclature of micro/nanodevices is based on their design, geometry, mechanism of motion and rotation. As a rule, their self-propulsion is provided by:
a) The conversion of chemical and enzymatic [20, 21] reactions into mechanical actions [22]. Such nanodevices move in a certain direction using the energy of enzymatic or various chemical reactions [23, 24]; e.g., i) nanodevices moved by gas-bubble formation (hydrogen, oxygen, etc.); ii) self-electropho-resis-propelled nanodevices operating on the principle of redox potential difference; iii) self-diffusion nanodevices moving thanks to a concentration gradient;
b) The influence of external stimuli (magnetic, acoustic, light field); i.e., they are stimulus-sensitive nanodevices [25];
c) Biological/biohybrid nanodevices, whose movement is generated by microorganisms and cellular components such as cilia, flagella, etc [26-29].
More recently, biomedical nanosystems designed for detoxification/neutralization have started to be explored. They are able to capture toxic molecules and reduce their concentration in an organism thanks
to their large surface area and high affinity for active ingredients. Such systems have been designed to treat tumor and inflammatory diseases [30-32], drug overdoses [33], xenobiotic detoxification, including industrial toxicants and chemical warfare agents, etc. Typically, drug delivery systems aim at encapsulating therapeutic agents and release them in target tissues under external stimuli control. A completely opposite approach is assumed for detoxification nanodevices. These nanocarriers ensure the removal of drugs and xenobiotics from biological tissues [34]. This review provides the proof of concept and potential applications of micro/nanodevices for detoxification.
TYPES OF NANODEVICES FOR DETOXIFICATION IN MEDICINE
Based on the general principles of therapy, detoxification is administered using:
a) antidote therapy or toxic-compound neutralization;
b) accelerated toxin elimination (hemodialysis, peritoneal dialysis, and hemosorption); and
c) symptomatic therapy; i.e., restoration of impaired functions.
Nanosystems as nonspecific antidotes
At present, the so-called antidotes, compounds and formulations capable of preventing or reducing the side effects of an overdose of drugs, are in demand. Nonspecific antidotes such as lipid emulsions, liposomes, and nanosponges are effectively capable of capturing drug molecules through nonspecific interactions (hydrogen bonds, hydrophobic effect, electrostatic interactions). Thus, non-specific antidotes have a broad spectrum of action for detoxification and drug overdose treatment.
Nanoemulsions. Lipid emulsion resuscitation therapy is recommended for the treatment of lipophilic drug overdoses; specifically, lipid emulsions (LE) are administered intravenously as non-specific antidotes, in the form of an "oil-in-water" type of drops [35]. LEs have been used for overdose treatment and to reduce the concentration of lipophilic antiarrhythmic, psycho-tropic, antimalarial drugs, local anesthetics, calcium channel blockers such as propranolol [36], cocaine [37, 38], diltiazem [39], buprenorphine, fentanyl and butor-phanol [40], bupivacaine [41], ivermectin [42, 43], and ropivacaine [44, 45]. LEs rapidly decrease the threshold for seizure activity, amoxapine toxicity [46], and improve cardiac activity during heart transplantation
[47]. They are also administered in cases of acute poisoning with neurotoxic organophosphorus compounds
[48]. In a recent case, active toxic molecules have been
Lipid emulsion
—:>
Blood vessels
Brain
y
Liver
Muscle
Fig. 1. LE action mechanism in human body: the toxins are captured by lipid emulsion in high-perfusion organs, such as the heart and brain, to be transported to the liver and muscles for further redistribution. Adapted from [49]
Red blood cell membrane
Polymeric
Membrane active protein
Fig. 2. Nanosponge structure that consists of a polymer-covered core with an erythrocyte membrane shell. Redrawn and modified from [55]
core
removed from biological tissues using a lipophilic amine nanocarrier that is able to react with the toxin (cargo-aldehyde) inside the LEs, forming a lipophilic imine conjugate in the oil core. Successful elimination of highly toxic aliphatic aldehyde 4-hydroxynonenal from living cells is evidence in favor of the concept of living cells detoxification [34].
LE action mechanism in human body is shown in Fig. 1. The emulsion captures highly lipid-soluble drugs from highly perfused organs such as the heart, brain, and kidneys and then transports them to the liver and muscles, contributing to enhanced toxins redistribution.
Recently, a dynamic multimodal LE action mechanism has been introduced. In this case, LEs capture not only toxins/drugs, but also change their pharmacokinetic profiles, exhibit a post-conditioning effect along with cardiotonic and vasoconstrictive properties, have a positive inotropic effect, reduce the release of nitric oxide, weaken mitochondrial dysfunction, phosphorylation of kinase-3P-glycogen synthase, etc. [50]. The effect of LE on the pharmacokinetic characteristics of drugs could be a guide for their clinical applications [33]. Despite the fact that LEs relieve a wide range of lipophilic drug intoxications, nevertheless, their optimal dosage, duration of administration, treatment initiation and administration have not been determined yet [51].
Nanocapsules. For the purpose of detoxification, na-nocapsules (oil core/silica shell) have been synthesized [52]. The authors of [52] found that nanocapsules of smaller diameter absorbe toxins more efficiently than larger nanocapsules. The distribution of drug/toxin in nanocapsules is proportional to the area of interfacial surface and does not depend on the concentration of oil phase. In addition, the drug distribution decreases
when the thickness of shell increases, since there is a decrease of drug penetration into the nanocapsules with a thicker shell [52]. For the treatment of alcohol intoxication, nanocapsules imitating hepatocyte detoxifying functions were developed to deliver enzymes (alcohol oxidase, catalase, and aldehyde dehydrogenase) to the liver. Alcohol oxidase and catalase contributed to the rapid removal of alcohol. The resulting acetaldehyde was effectively oxidized by aldehyde dehydrogenase. Administration of the developed antidote to mice suffering alcoholic intoxication provided a significant decrease alcohol concentration in the bloodstream without acetaldehyde accumulation [53].
Nanosponges. Nanosponges are a naturally degrada-ble 3D scaffold formed in solution by crosslinkers. [54]. For the first time, nanosponges covered by a natural cell membrane and functioning through bi-omimicry were proposed by Zhang L. in [55]. "The nanosponge acts as a toxin bait in vivo and is a new way to remove toxins from the bloodstream", Zhang L said. "Instead of building specific products to treat individual toxins, we are developing a platform that can neutralize the toxins produced by a wide range of pathogens". The nanosponges developed by Zhang L and colleagues consist of poly(lactic-co-glycolic acid) polymer core (PLGA) and an outer shell of red blood cell membrane that attract toxins like a bait (Fig. 2).
In tests on mice, prophylactic administration of nanosponges reduced mortality down to 11%, compared to 100% mortality without treatment. With nanosponges, mortality in mice dropped to 56% after toxin injection. Suggestively, the nanosponges containing the isolated toxin accumulated in the liver, where, in the absence of any damage, the toxin was safely metabolized and eliminated from the body [55, 56].
Yeast cells
Fe3O4 nanopart|d£s Janus 2-Methylimidazole JYC-robot
Tannic acid
Co2+
FC-yeast
Fig. 3. Designing biomimetic hybrid systems for the neutralization of mycotoxins. Adapted from [73]
Nanosponges were effectively used for detoxification of bacterial toxins [57, 58]. They were able to bind and neutralize low-molecular-weight compounds [59], autoimmune antibodies [60], inflammatory cyto-kines [61], bacteria and viruses [62, 63], and neuro-toxins (tetrodotoxin, botulinum toxin, and saxitoxin) [64]. Nanosponges for the neutralization of neurotox-ins consist of a polymer core covered by a membrane of neurons; namely, neuro-2a cells. The use of this mouse neural crest-derived cell line increased the mice's survival rate in the absence of acute toxicity [64]. Two-modal detoxification with nanosponges that possess an oil core and are coated with an erythrocyte membrane (Oil-NS) was more effective [65]. This Oil-NS construction combines the specific binding capacity of biological receptors on the cell membrane with the non-specific absorption of oil core. Together, they increase the overall detoxification capacity.
A nanosponge-gel hybrid system also neutralizes toxins. Its use for both therapeutic and prophylactic purposes has led to a significant improvement in the treatment of toxin-related skin damage [66]. A subject for further study is a biomimetic detoxification strategy based on the creation of nanoparticles coated with a platelet membrane. Such systems can be promising as additional therapy for patients with a methicillin-resistant Staphylococcus aureus infection [67].
Erythroliposomes. Erythroliposomes (RM-PL) are a biomimetic platform consisting of artificial lipid membranes and natural erythrocyte membranes. Such systems have been successfully used to neutralize various hemolytic pore-forming toxins [68]. The toxins absorbed by RM-PL are transferred to the liver and spleen, where they undergo endocytosis and are digested by macrophages. In mice, administration of RM-PL eliminates initial toxicity in target organs, allowing the animals to survive.
Biomimetic hybrid systems. Janus micromotors are magnesium and gold particles coated with a red blood cell membrane (RBC-Mg) that acts as a bait and absorbs and neutralizes biological toxins in water and biological media. RBC-Mg nanomotors have been used to rapidly detoxify a-toxin and methylparaox-on, models of membrane-damaging toxins and chemical warfare agents, respectively [69, 70]. Hybrid biomembrane nanorobots with an acoustic drive and a membrane consisting of two types of cells (eryth-rocytes and platelets) effectively bind to both toxins and pathogens in the blood. To eliminate simultaneously pathogenic bacteria and toxins the proteins located in the hybrid membrane are used. They bind to pathogens and neutralize pore-forming toxins [71, 72]. There are examples [73] of microrobots with Fe3O4 nanoparticles covering yeast cells and creating a zeolite imidazolate framework-67 (ZIF-67) to neutralize mycotoxins (Fig. 3).
Nanodialysis systems for improved detoxification
Liposomes. Designing liposomal dialysates is an emerging area of research. Liposomes without drugs, "empty liposomes", were used as scavengers for exogenous and endogenous toxic molecules. Some of these studies have reached clinical trials. It is quite possible that liposomes will be medically used as na-noantidotes in the next decade [74]. The introduction of "empty" liposomes contributes to reservoir formation for toxin binding. Liposomes bind toxins through electrostatic interactions and a hydrophobic effect in the membrane or through ion trapping into the hy-drophilic core. Non-ionized molecules penetrate the liposome membrane. They are captured by a hydro-philic, pH-controlled core of liposomes. For example, a weakly basic drug molecule, upon entering a hydro-philic core with an acidic pH value can be ionized and
Fig. 4. pH-gradient liposomes with a pH gradient between the internal and external environments: acidic/basic pH inside, neutral pH outside. Adapted from [82]
B
AH
Base
Acid
Lipophilic compound = PEG-lipid
=Q
=o
=©
Anionic lipid Neutral lipid Cationic lipid
lose its ability to diffuse through the lipid bilayer of liposome membrane (Fig. 4).
For the first time, a hemodialysis method including liposomes and antioxidants has been presented as a unique strategy for removing toxins. Its application in vitro resulted in a further noticeable decrease in the amount of oxidation products and removal of platelets and bilirubin when compared to conventional hemodialysis [75]. In vivo experiments in rats suffering from uremia confirmed that the addition of liposomes to the dialysate as an adjunct to conventional hemodialysis facilitated the removal of protein-bound uremic solutes. The developed nanosystem has unique advantages in comparison with albumin and other alternatives that use sorbents [76]. Modified by linoleic acid [77] and decorated with polyethyleneimine, liposomes demonstrated significantly higher binding rates and rapid clearance of protein-bound uremic toxins [78]. Preclinical evaluation of transmembrane liposomes with a pH gradient for the ammonia concentration confirmed the ability of liposome-supported peritoneal dialysis (LSPD) to reduce plasma ammonia levels in pigs with artificially induced hyperammonemia [79]. LSPD, in particular its peritoneal dialysate, enriched with pH-gradient liposomes, i.e., with a pH gradient between the internal and external environments of liposomes (acid inside, neutral outside), alleviated the symptoms of poisoning in animal models in [80, 81]. An apparent increase in the concentrations of haloperidol, verapamil, and amitriptyline in the di-
alysate using LSPD was observed in rats compared to a peritoneal dialysate without augmentation [80, 81]. LSPD was used to remove toxins/highly plasma protein bound drugs. Amitriptyline was chosen as a drug that highly binds to plasma proteins. It was shown that LSPD increases amitriptyline extraction in vivo in [82].
Polyethylene glycol-modified liposomes encapsulated with phosphate-binding iron (III) citrate trap the circulating phosphate ions into the inner liposo-mal core. These traps reduce the concentration of free phosphate ions in solution and in serum [83] (Table 1).
ENZYME NANODEVICES FOR DETOXIFICATION
A detailed description of nanoparticles with encapsulated enzymes is present in our recently published review [85], where nanoparticle types, materials, results of clinical studies, etc., were considered. Therefore, in this part of this review, we want to focus on such systems as enzymatic nanodevices for neutralizing toxins. Enzyme encapsulation in nanocarriers opens up possibilities for the creation of nanoreactors, nanodevices that contain the molecules needed to support anomalous diffusion and abide by kinetic laws. Such systems are capable of performing single or cascade reactions either for biosynthesis or for degradation of toxic substrates [86]. Nanobiotechnology of enzyme nano-reactors is a new, rapidly developing area of research. For example, recently, alcohol oxidase and catalase enzymes-containing liposomes supporting peritoneal
Table 1. Types of detoxification nanodevices, materials and enzyme/drug library
Nanodevices Material Neutralization In vivo model Ref.
LE Lipoamine Cargo-aldehyde - [34]
Intralipid Propranolol White rabbits [36]
Intralipid Cocaine Clinical trial [37]
Intralipid Cocaine Dog [38]
Intralipid Diltiazem Clinical trial [39]
Intralipid Buprenorphine, fentanyl, butorphanol - [40]
Intralipid Bupivacaine Pigs [41]
Intralipid Ivermectin Pogona vitticeps [42]
Intralipid Ropivacaine Pigs [44]
Intralipid Sevoflurane, isoflurane Rats [45]
Intralipid Amoxapine Clinical trial [46]
Intralipid Organophosphates Clinical trial [48]
Nanocapsules Tetramethoxysiloxane, octadecyltrimethoxysilane, ethyl-butyrate, lecithin, Tween-80 Quinoline - [52]
Acrylamide, APm, N,N'-methylenebisacrylamide, enzymes (Alcohol oxidase, Catalase, Aldehyde dehydrogenase) Ethanol C57BL/6 mice [53]
Nanosponges RBC membrane, PLGA Bacterial toxins (melittin, a-hemolysin, listeriolysin O, streptolysin O) - [57]
RBC membrane, PLGA Bacterial toxins CD-1 mice [58]
RBC membrane, PLGA Bichlorvos CD-1 mice [59]
RBC membrane, PLGA Autoantibodies CD-1 mice [60]
Peripheral blood neutrophils membrane, PGLA Proinflammatory cytokines ICR mice [61]
Bacterial membrane, PLGA Bacteria C57BL/6 mice [62]
Lung epithelial cells membrane/macrophage membrane, PLGA SARS-CoV-2 C57BL/6NHsd mice [63]
Neuro-2a cells membrane, PLGA Tetrodotoxin ICR mice [64]
RBC membrane, olive oil Organophosphates (paraoxon, diisopropyl fluorophosphate, dichlorvos) ICR mice [65]
RBC membrane, PLGA, Pluronic F127 Pore-forming toxins ICR mice [66]
Platelet membrane, PLGA S. aureus CD-1 mice [67]
Erythroliposomes RBC membrane, cholesterol, phosphatidylcholine, mPEG-DSPE EPC, Pore-forming toxins ICR mice [68]
Janus micromotors RBC membrane, Mg, Au, chitosan a-toxin - [69]
RBC membrane, Au, citric acid Melittin - [70]
Hybrid biomembrane nanorobots RBC membrane, Au Pore-forming toxins - [71]
RBC and platelet membrane, Au Pore-forming toxins - [72]
Janus microrobots Yeast cell membrane, Fe3O4, 2-methylimidazole Mycotoxins - [73]
Liposomes Lecithin, cholesterol, deoxysodium cholate Protein-bound uremic toxins Sprague Dawley rats [76]
Lecithin, cholesterol, linoleic acid, Tween-80 Protein-bound uremic toxins - [77]
Lecithin, cholesterol, linoleic acid, polyethylenimine, Tween-80 Protein bound uremic toxins - [78]
LSPD DPPC, cholesterol, mPEG-DSPE, citric acid Ammonia Gottingen minipig [79]
DPPC, cholesterol, DSPE-mPEG Ammonia Sprague Dawley rats [80]
DPPC, cholesterol, DSPE-mPEG Amitriptyline Sprague Dawley rats [81]
DOPG, cholesterol Amitriptyline Sprague Dawley rats [82]
Phosphatidylcholine, cholesterol, DSPE-mPEG, iron citrate Phosphate ions - [83]
DOPE-NHS, ß-octylglucoside, enzymes (Alcohol oxidase, Catalase) Ethanol Sprague Dawley rats [84]
dialysis have been investigated. In this nanoreactor, H2O2 addition accelerates ethanol removal for H2O2 to be rapidly decomposed into O2 by the catalase, while enzymatic liposomes enhance ethanol metabolism. In a model of rodent intoxication with ethanol, enzyme liposomes enhanced ethanol metabolism, as was evidenced by increased production of acetaldehyde, the main metabolite of ethanol [84].
In our laboratory, we focus on the design and development of injectable therapeutic enzyme nanore-actors for the neutralization of toxicants like organo-phosphorous (OP) pesticides [87]. Enzymes capable of detoxifying OPs can be used as bioscavengers. They act either as stoichiometric, pseudocatalytic or catalytic traps for OP molecules [88, 89]. These enzymes, phosphotriesterases and cholinesterases, are the active components of these therapeutic nanodevices. Encapsulation of bioscavengers in such vehicles is first intended to overcome the fast clearance and immune response after injection of soluble heterologous therapeutic enzymes. The aim of enzyme encapsulation into nanoreactors is also to provide a high concentration of reactive enzyme in stable nanocontainers. Determining the concentration of the encapsulated enzyme inside nanocarriers is an important step in designing an efficient in vivo nanoreactor. In presence of an injectable nanoreactor, the toxicant present in the bloodstream diffuses across the nanoreactor's membrane, and the enzyme-mediated detoxification reaction takes place inside the sealed compartment [90]. Enzyme concentration (E) inside a nanobody can be either low or much higher than that of the toxicant (T). The reaction inside the nanoreactor occurs either under first ((E) << (T)) or second-order conditions ((E) « (T)) with respect to toxicant concentration (T). However, partial enzyme encapsulation may occur as well and, in this case, an enzymatic "corona" forms on the outer surface of the nanoreactors, which can complicate the process and lead to the undesirable, rapid clearance and possible adverse immune responses to
heterologous enzymes. Thus, the permeability of the nanoreactor membrane for substrates and reaction products, possible osmotic effects, the effects of viscosity and crowding, and the formation of an enzymatic "corona" are important technological problems that have not yet been fully resolved. [90].
CONCLUSION
The number of publications devoted to the development of alternative, efficient, and multifunctional biomedical systems such as robotic nanodevices for detoxification is on the rise. This review shows that the proposed concept of nanodetoxification requires an interdisciplinary approach and the borrowing of knowledge from many different fields, such as na-nosystem design, biochemistry, biotechnology, micro-and optoelectronics, etc. One of the possible directions in acute poisoning treatment is the development of "empty" nanomedical preparations based on materials and compounds that have been approved for clinical use. In addition, designing nanodevices opens up new opportunities in the treatment of bacterial and viral infections.
However, there is still a long way before highly sensitive, easily controlled, and safe nanodevices are created and such problems as moving in narrow and hard-to-reach places (e.g., capillary blood vessels), performing complex functions, being flexible and cost-effective are resolved.
T.N. Pashirova., Z.M. Shaihutdinova, V.F. Mironov acknowledge the financial support received from the government assignment for FRC Kazan Scientific
Center of Russian Academy of Sciences. The work of P. Masson (Enzyme nanodevices for detoxification) is carried out in accordance with the Strategic Academic Leadership Program "Priority 2030" of the Kazan Federal University of the Government of the Russian Federation
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