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412 N. Nomikou et al.
https://t.me/med1917
in a site-specic manner has also been developed with applications in the treatment of cardiovascular disease (Chorny et al. 2010).
Instead of polymers, gold can be used as a shell for the magnetite nanoparticles, based on its biocompatibility and capacity to chemically bind a variety of molecules (Fig.
15.10b). One characteristic example is the system composed of gold-coated
nanoparticles loaded with doxorubicin, the amine group of which binds to the
Fe
3O4
gold shell (Kayal and Ramanujan 2010). A novel approach has been designed for an innovative application called directed enzyme prodrug therapy (Gwenin et al. 2011). This approac h involves conjugating a genetically modied prodrug-activating enzyme onto the surface of gold-coated Fe
nanoparticles. The direction of the
3O4
enzyme-carrying nanoparticles to the target site using a magnetic eld can afford activation of the prodrug at the site of the disease. A system with an alternative to polymer or gold coating ha s been developed for theranostic applications in cancer, and it is described as a mesoporous nanostructure with both upconversion lumines­cence and magnetic properties, consisting of a SiO by rare-earth-doped NaYF
shell and carrying doxorubicin (Zhang et al. 2012). The
4
-coated Fe3O4 core surrounded
2
system signicantly improved doxorubicin targeting in murine tumours in the presence of an applied magnetic eld.
One of the major attributes of magnetic nanoparticle-based systems is the multifunctionality that they can offer. Magnetic guidance for targeted drug delivery can be combined with magnetic hyperthermia for either hyperthermic ablation or controlled drug release, as well as with imaging, since the nanoparticles can serve as a contrast agent for magnetic resonance imaging (MRI), in vivo. Hence, these systems are most commonly developed as theranostics. Core-shell type nanoparticles, consisting of superparamagnetic iron oxide nanopar ticles (SPIONs) coated with mesoporous silica and/or lipid and carrying doxorubicin have been developed for theranostic applications in drug delivery, magnetic hyperthermia, and as contrast agents (Patil-Sen et al. 2020). The nanoplatforms in this study enhanced the quality of MRI imaging, induced ablative hyperthermia upon the application of an oscillating magnetic eld, and served as doxorubicin carriers. However, the design of the nanostructures described in the study afforded only passive release of doxorubicin, at 37 °C, as distinct from magnetic eld-triggered release. The use of thermosensitive polymers (e.g. crosslinked PNIPAM hydrogels) or lipids with reachable phase transition temperatures for carrying the chemothera­peutic agent can equip such magnetically responsive systems with the additional attribute of on-demand hypert hermia-induced drug release (Satarkar and Zach Hilt
2008; Veloso et al. 2021). Importantly, the release rate of the entrapped therapeutic
agent can be controlled by the duration, intensity, and/or pulse mode of the applied magnetic eld.
A promising category of magnetic nanoparticles with a wide range of applications in theranostics is the magnetoliposomes or magnetoresponsive hybrid liposomes
15.10c). These are liposomes carrying magnetic nanoparticles, which can be
(Fig. incorporated in the hydrophilic core as a single nanoparticle or nanoparticle cluster (Rodrigues et al. 2016; Calle et al. 2015), imbedded in the lipid bilayer (Choi et al.
2019; Shirmardi Shaghasemi et al. 2017), or conjugated on the surface of the
15 Stimulus-Responsive Nanoparticles for Drug Delivery 413
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liposomal membrane (Acharya and Chikan 2020; Ma et al. 2021). The latter approach allows to make the entire liposomal core available for drug loading, improving loading efciency. The magnetic behaviour of magnetoliposomes strongly depends on the size of the embedded magnetic nanoparticles and the functionalization of liposomes with magnetic nanoparticles larger than 5 nm in diameter with high efciency is of considerable interest. Incorporating magnetic
pos
nanoparticles of sizes larger than 3.4 nm in the lipid bilayer of li
chall
is a major
enge, and for this reason, multiple studies have focused on develop-
omes, however,
ing methods to make this possible, including for magnetic particles as large as 15 nm (Choi et al.
2019).
Based on current progress, magnetic guidance for achieving spatial control in drug delivery is a concept that has not been adequately explored and optimi zed for clinical translation. Most published studies in this context describe innovative systems that have only been tested in vitro, using either cell-free or cell-based experimentation. Some studies have provided stronger proof of concept results, exploring the translational potential of such systems by means of in vivo experimen­tation, mainly in small rodents. Despite the positive outcomes in these early in vivo studies, magnetic guidance is achieved by simply placing a strong magnet against a supercial tumour or defective site, a setting that would not be feasible for the treatment of deep-seated tumours or diseased sites in clinical applications. Essen­tially, extensive and strategic preclinical in vivo and/or early-phase clinical investi­gation needs to be completed to verify the clinical feasibility of the magnetic targeting concept, mainly with respect to the biodistribution and bioavailability of the drug-carrying magnetic nanoparticles, their long-term safety after repeated treatments, as well as a variety of critical aspects related to the externally applied magnetic eld, such as the required technological platform and the exposure param­eters, in order to achieve site-specic nanoparticle accumulation, in a minimally invasive manner.
An important matter for consideration is also the extent of spatial guidance or targeted accumulation afforded with the application of an externally applied mag­netic eld. Non-specic accumulation in healthy organs and tissues remains an issue, since magnetite causes oxidative stress disrupting normal cellular function, as well as inammation and neurobehavioral alterations in animal models. The polymeric and other coatings used for rendering these nanosystems biocompatible are biode­gradable and, moreover, they can be removed in the acidic endolysosomal condi­tions upon cellular uptake, exposing the reactive surface of Fe
3O4
.
15.3.4 Ultrasound-Responsive Nanoparticles
Ultrasound is among the safest and most promising stimuli for the spatiotemporal control of drug release, since it is not associated with ionizing radiation, it can be applied in a non-invasive manner, and it can be transmitted efciently through tissue allowing locoregional drug release even in deep-seated sites. The frequency of
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Fig. 15.11 (a) A nanoemulsion droplet forming microbubble upon ultrasound exposure, (b) Non-inertial and inertial cavitation under an ultrasonic eld
ultrasound can be adjusted to optimize exposure at different depths in the body. More specically, for targeting supercial lesions/defects, an ultrasound frequency at 5 MHz is normally employed, while frequencies 0.5–1 MHz are used for the treatment of deep-seated regions or when transmission of ultrasound to the target is impeded by attenuating structures, such as the skull. The acoustic energy deposited
adjust
at the target site for activating drug release can be tuned by intensity and
duty cycle. The formulations that have been developed as ultrasound-
ing the ultrasound
responsive nanocarriers are nanobubbles, liquid peruorocarbon droplets, MSNs, and micelles/liposomes. These nanocarriers exploit the ultrasound-induced mechan­ical effects, such as cavitation, or the high-intensity ultrasound-induced heating effect for on-demand drug release in a site-specic manner.
Peruorocarbon (PFC) nanoemulsions offer an efcient system for low-intensity ultrasound-mediated drug delivery (Zhong et al. 2019). They can serve as carriers of hydrophobic drugs and can accumulate in tumour tissues via the EPR effect. PCF nanoemulsions offer the attribute of forming microbubbles through acoustic droplet vaporization under an ultrasonic eld (Fig. 15.11a). When the formed microbubbles are further exposed to ultrasound, they are forced to oscillate in size or shape, a phenomenon called non-inertial cavitation (Fig.
15.11b). When microbubble diam-
eter during non-inertial cavitation grows to at least twice its original diameter, it violently collapses and fragments to smaller bubbles, a phenomenon called inertial cavitation (Fig.
15.11b), with subsequent drug release. Both non-inertial and inertial
cavitation cause microstreaming, which can generate transient pores on membranes of cells that are in close proximity increasing their permeability. Essentially, when the formed microbubbles are subjected to cavitation, they can promote cellular uptake and/or release of the entrapped drugs in a site-specic manner. Similarly, drug-containing echogenic liposomes enclose nanoemulsions (Fig. 15.12a), pockets
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Fig. 15.12 (a) Ultrasound-responsive liposomes, containing a. nanoemulsion in the core, and (b) pocket of air in the shell
of air (Fig. 15.12b), or nanobubbles within their core and can respond to an ultrasonic eld facilitating drug release and cellular uptake (Huang and MacDonald
2004; Kopechek et al. 2008; Batchelor et al. 2020; Ezekiel et al. 2021).
The responsiveness of MSNs to ultrasound makes them a suitable drug carrier for on-demand drug release using low-intensity ultrasound. The hydrophobic internal channels/cavities of these porous nanosystems can accommodate hydrophobic drugs, such as paclitaxel, as well as store gas in the form of nanobubbles, with the nanosystems promoting drug release upon exposure to an ultrasonic eld, in a site­specic manner (Wang et al. 2018; Ho et al. 2020). More recently, metal–organic frameworks (MOFs) have gained signicant attention as drug nanocarriers due to their advantageous physicochemical properties, including their responsiveness to low-intensity ultrasound. The release of chemotherapeutic agents accommodated in the porous structure of these nanocarriers can be triggered by ultrasound, which accelerates percolation of the drug molecules through the pores via low-frequency oscillations and cavitation effects (Ahmed et al. 2021; Wan et al. 2021).
The application of high-intensity focused ultrasound (HIFU), as distinct from low-intensity ultrasound, induce s hyperthermic effects and when used in combina­tion with thermosensitive drug carriers, enables spatiotemporally controlled drug release. One example is the combination of HIFU with the liposomal doxorubicin formulation ThermoDox (Celsion Corp.), currently investigated in clinical trials for the treatment of hepatic tumours, sarcoma, and bone metastasis. Other types of thermoresponsive nanocarriers, such as micelles, solid–lipid nanoparticles, or core­shell nanoparticles, utilizing thermosensitive lipids and polymers, are being inves­tigated in combination with HIFU for on-demand drug release.
In an innovative approach, carboxyl-calcium coordination bonds were incorpo­rated in the sodium alginate coating of MSNs, which blocked the pores of MSNs and prevented the cargo from being released before stimulation. The coordination bonds would break upon exposure to low-intensity ultrasound (at 20 kHz) or HIFU (at 1.1 MHz), leading to rapid payload release. When ultrasound exposure is paused,
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the coordination bonds can be reformed, suspending the payload release process (Li et al. 2019). This controllable drug release system demonstrates the potential of ultrasound to serve as an on–off switch in a remote and site-specic manner.
15.4 Conclusions
The array of stimulus-responsive nanosystems designed and developed, thus far, holds signicant potential to improve the efcacy and targeted effects of therapeutic modalities for different disease types, by providing spatiotemporally controlled drug release. Importantly, using combinations of the smart design and structural func­tionality approaches described in this chapter, nanosystems that are responsive to more than one stimulus can be constructed for multimodal or multidrug delivery (An et al. 2016; Hegazy et al. 2017; You et al. 2018). Using these dual- or multi­responsive systems, different agents can be released from nanocarriers at different times and/or the timing of payload release from a nanoparticle does not need to coincide with payload activation. It is impo rtant to note that this chapter focuses on the responsiveness of the actual nanocarrier systems and does not cover the concepts of photodynamic and sonodynamic therapies, which involve the activation of non-toxic agents, called sensitizers, using light and ultrasound, respectively (McHale et al. 2016; Kwiatkowski et al. 2018). The stimulus-responsive nanocarriers described here still carry chemotherapeutic or other toxic-to-healthy tissue agents, which off-target tissues/organs, such as liver, kidneys, and spleen, are heavily exposed to, with subsequent side effects. Importantly, drug delivery using nanoparticles in the treatment of solid tumours still heavily depends on the hyperpermeable vasculature and suppressed lymphatic clearance characteristic of tumour tissues, known as the EPR effect. This effect can guarantee the accumulation of only a small proportion of the nanoparticles within the tumour mass, while there is signicant accumulation in peripheral organs and tissues. The endogenous and exogenous stimuli can provoke drug release from nanoparticles that have already accumulated in the tumour mass through the EPR effect. Hence, the dose, frequency, and duration of systemic administration are still restricted, despite the spatiotemporal control that stimulus-responsive systems offer. One additional aspect to consider in terms of the clinical translation of each system is the fact that the nanocarriers and their drug release mode alter drug efciency and consequently, doses of drugs need to be recalibrated.
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