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Perspective

Metal–Organic Frameworks (MOFs) for Cancer Therapy

by
Mohammad Reza Saeb
1,
Navid Rabiee
2,3,*,
Masoud Mozafari
4,
Francis Verpoort
5,6,7,
Leonid G. Voskressensky
8 and
Rafael Luque
8,9,*
1
Department of Polymer Technology, Faculty of Chemistry, Gdánsk University of Technology, G. Narutowicza 11/12, 80-233 Gdánsk, Poland
2
Department of Physics, Sharif University of Technology, Tehran P.O. Box 11155-9161, Iran
3
School of Engineering, Macquarie University, Sydney, NSW 2109, Australia
4
Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, University of Toronto, Toronto, ON M5G 1X5, Canada
5
Laboratory of Organometallics, Catalysis and Ordered Materials, State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
6
National Research Tomsk Polytechnic University, Lenin Avenue 30, 634050 Tomsk, Russia
7
Global Campus Songdo, Ghent University, 119 Songdomunhwa-Ro, Ywonsu-Gu, Incheon 21985, Korea
8
Department of Chemistry, Peoples Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya Str., 117198 Moscow, Russia
9
Departamento de Química Orgánica, Universidad de Córdoba, Campus de Rabanales, Edificio Marie Curie (C-3), Ctra Nnal IV-A, Km 396, E14014 Cordoba, Spain
*
Authors to whom correspondence should be addressed.
Materials 2021, 14(23), 7277; https://doi.org/10.3390/ma14237277
Submission received: 8 October 2021 / Revised: 15 November 2021 / Accepted: 19 November 2021 / Published: 28 November 2021
(This article belongs to the Special Issue Feature Collection on Porous Materials)
Browse Figure
Versions Notes

Abstract

:
MOFs exhibit inherent extraordinary features for diverse applications ranging from catalysis, storage, and optics to chemosensory and biomedical science and technology. Several procedures including solvothermal, hydrothermal, mechanochemical, electrochemical, and ultrasound techniques have been used to synthesize MOFs with tailored features. A continued attempt has also been directed towards functionalizing MOFs via “post-synthetic modification” mainly by changing linkers (by altering the type, length, functionality, and charge of the linkers) or node components within the MOF framework. Additionally, efforts are aimed towards manipulating the size and morphology of crystallite domains in the MOFs, which are aimed at enlarging their applications window. Today’s knowledge of artificial intelligence and machine learning has opened new pathways to elaborate multiple nanoporous complex MOFs and nano-MOFs (NMOFs) for advanced theranostic, clinical, imaging, and diagnostic purposes. Successful accumulation of a photosensitizer in cancerous cells was a significant step in cancer therapy. The application of MOFs as advanced materials and systems for cancer therapy is the main scope beyond this perspective. Some challenging aspects and promising features in MOF-based cancer diagnosis and cancer therapy have also been discussed.

1. MOFs for Cancer Therapy: So Far, So Close!

Scientists are continuously seeking new types of treatments, early diagnosis, and early detection in order to combat diseases such as cancer [1,2,3]. The potential of MOFs as advanced materials and systems for cancer therapy is the main scope beyond this perspective [4,5,6]. Some challenging aspects and promising features in MOF-based cancer diagnosis and cancer therapy are also discussed (Figure 1). This is an interesting field of science with progressive advancements that need much focused attention in order to make a full transition from bench to bedside; however, till now, there are limited successful case studies able to provide a phase change to clinics. This is an important aspect to diagnose the limitations and inhibiting factors regarding the use of advanced materials including MOFs for therapy for cancer progressing to clinical stages.

2. MOFs in Detecting Cancer Biomarkers

Imaging and photofunctional technologies are rapidly developing to provide scientists with a visual tool for cancer diagnosis. Biological markers, or briefly biomarkers, function as an index to quantitatively express the state of the biological microenvironments for the sake of detection and diagnostic purposes [7,8]. Medical therapeutic approaches benefiting from biomarkers work on the basis of blood, urine, or soft tissues. The use of biomarkers makes possible the examination of biological processes working properly such as pharmacologic response of soft tissue to a therapeutic protocol [9,10]. In other words, biomarkers enable medical researchers and doctors to find and deepen the understanding of an interrelationship between the risk of human disease and a therapeutic protocol [11,12,13,14,15]. Indeed, high surface area and tunable micro- and nanoporous structure are key enabling features in the use of MOFs as biomarkers (Table 1; classification of MOF applications in bioimaging). In this regard, efficient recognition of elements is prioritized in MOFs optimization. Additional features including high thermal stability would be necessary, e.g., applying hyperthermia in cancer immunotherapy. MOFs are widely employed for luminescence sensing or photofunctionality as well as chemical detection of species in cancer therapy. MOFs’ inherently induced optical and photonic properties are fueled by both organic ligands and metal ions and dyes or markers encapsulated in MOFs. Correspondingly, mechanisms including metal-to-ligand or ligand-to-metal charge transfer as well as ligand-ligand and metal-metal charge transfer are liable for luminescence emission.
A variety of nanoparticles hybridized with MOFs have been developed for chemical sensing. For example, lanthanide-functionalized MOFs are exceptional structures, each representing a specific luminescence color, all detectable in the visible region. Each lanthanide has its distinctive signatures to be taken into account for a targeted detection mission. Manipulation of porosity gives rise to the development of complex biomarkers for early detection of the tumor as well as visual monitoring of anticancer drug loading and release. Detection of nucleic acids and proteins and small physiological molecules is known as a route for MOF-based cancer diagnosis. For example, ovarian and some gynecological cancers can be diagnosed at early stages by exploring a correlation between fluorescence intensity and dosage of lysophosphatidic acid as a biomarker [15].

3. MOFs for Enhanced Cancer Therapy

Cancer is a complex phenomenon arising from RNA damage. Effective and rational cancer therapy is pertinent to the degree of success in understanding the mechanisms controlling the regeneration and proliferation of cancerous cells [27,28,29]. Targeted cancer therapy seeks to address the causation and visualize the generation and distribution of the cancerous cells [30,31,32]. The focus in targeted therapeutics is placed on exploring highly efficient noninvasive pathways to make it possible to precisely attack the region from which cancer cells are generated and proliferated [33]. Nanomedicine, the use of nanoparticles in medicine, makes good use of nanochemotherapeutics for cancer treatment. This field has been experiencing a progressive growth period since the early 21st century. Attention has been paid to treating cancer by changing attitudes in a worldwide shift from disparate to clinical investigations. Because of the aforementioned beneficial features, MOFs are widely used as tailorable theranostic platforms for both cancer diagnosis and cancer treatment, including monomodal therapeutics such as photodynamic therapy (PDT), photothermal therapy (PTT), chemotherapy, radiography, and immunotherapy, as well as multimodal/combined imaging, thermal, and chemotropic treatments [34]. An overview of the literature on the use of MOF in individual cancer therapy is summarized in Table 2.
PDT-based treatment works on the bedrock of administration of a photosensitizer supported via irradiation of cancerous cells at a wavelength in the vicinity of the absorbance band of the sensitizing agent. It is a clinically approved therapeutic with a very low possibility of invasion. PTT in the oxygen atmosphere enables one to directly attack the tumor cells and induces a local inflammatory reaction, which appears promising at the early stages of cancer [61]. MOFs are successfully applied in PDT in vivo. The strategy is based on modification and/or functionalization of MOFs to make them photosensitizers working efficiently under a specified laser irradiation wavelength. For example, in situ polymerization of dopamine with Mn, Co, or UiO-66 frameworks resulted in hybrid photosensitizing agents inducing cancer cell apoptosis [62,63]. A wide variety of MOFs, including Pt-MOF, Co(Hmim)2 (ZIF-67), Coordination Polymer of Oslo (CPO-27)–M (M = Zn, Ni, and Mg), Hong Kong University of Science and Technology (HKUST)-1, Fe– Materials Institute Lavoisier (MIL)-101–NH2, Universitetet i Oslo (UiO)-66–NH2, and Isoreticular Metal-organic Framework (IRMOF)-3 possessing absorption bands in the range of light emission have been applied as photosensitizing agents in cancer therapy [64]. For instance, UiO-66@PAN, possessing uniform size and dispersibility in aqueous solution, is localized via endocytosis and revealed excellent PTT effect in vitro, significantly inhibiting colon cancers’ growth in vivo [48].
Chemotherapeutic techniques, with and without radiography as their complements, have been reported in literature. Nevertheless, clinical data seems necessary to assess their efficiency compared to PTT and PDT techniques. For instance, in bowel cancer, chemotherapy could very limitedly be supported by radiotherapy, to reduce locoregional relapse [65]. A core/shell, namely persistent luminescence-sensitive UiO-66 NMOFs hybridized with mesoporous carbon, is applied in imaging-guided chemotherapy. Particle size is as small as ca 70 nm with a tunable pore size (∼4.8–16.2 nm) in the shell and NIR luminescence from the core. Three model drugs used revealed enhanced delivery and tumor therapy [66]. The encapsulation of Adriamycin as a model anticancer drug in Zn-MOF hybridized with folic acid resulted in the development of a promising drug delivery system (DDS) as well as tumor-targeted chemotherapy of cervical cancer, as evidenced both in vitro and in vivo [67].
Application of MOFs for bone cancer therapy is based on radiotherapy-accelerated tumor ablation and prevention of lung metastasis, which is featured by the reduction in hypoxia-inducible factor [68]. A combined radiotherapy/radiodynamic therapy with the aid of NMOFs ended in a successful clinical treatment by eliminating lung metastases, which resulted from reactivating antitumor immunity and inhibiting myeloid-derived suppressor cells [69]. MOFs are also used in immunotherapy of cancer, individually or in combination with other therapeutics. Site-specific ZIF-8 modified with hyaluronic acid resulted in enhanced immunotherapy, particularly when aided by photothermal agents, but still, the activation of immune response was inadequate [70]. To overcome such a low efficiency in immunotherapy, lysosome-targeting Zn-NMOFs coupled with a lysosome-targeting aptamer (CD63-aptamer) with pH-sensitive character and high capacity for protein encapsulation are examined with improved antitumor effect of T cells [71]. Some RNA interference (RNAi) techniques benefit from sequence-specific and/or post-transcriptional gene silencing to regulate the expression of proteins.
When used individually, cancer therapeutics can kill cancer cells limitedly. The combination of two or more therapeutics reduces side effects and synergistically enhances anticancer efficacy. MOF-based combined therapeutic methods such as chemophototherapy or PTT/PDT have also been carried out in order to increase the effectiveness of treatments. For example, highly tailorable core/shell nanoplatforms based on porphyrinic MOF-coated gold nanorods used in PTT/PDT/chemotherapy enhanced drug-loading capacity as well as showed near-infrared (NIR) light sensitivity for imaging; moreover, they generated reactive oxygen and provided the tumor with photothermal activity in cancer treatment [72]. There have been some more complex cases such as dual-mode and photoacoustic imaging as well as gas therapy combined with PTT and chemotherapy based on Fe (Ⅲ)-based NMOF (MIL-100) nanocarriers used by the NIR-based drug/gene delivery to kill cancer cells [73,74]. Stimuli-responsive hybrid NMOFs with precisely tailored structure and modulated release are also used successfully in treating breast cancer cells by applying combined PDT/chemotherapy [75].

4. Multifunctional MOFs for Cancer Theranostics

Over the past decade, a great deal of attention has been directed to the modification and functionalization of NMOFs through different methods to enhance their therapeutic efficiency. In this regard, multifunctional NMOFs are developed which rely on targeted cancer therapy. Surface modification of MOFs occurring in the course of self-assembly and post-synthetically occurring modifications are two major classes that trigger the outside surface of MOFs. Polymer-coated or polymer-wrapped MOFs are a class of functionalized MOFs by which one can enlarge the biomedical application window of NMOFs. Attachment of polymers possessing reactive groups like carbohydrate polymers to MOFs leads to enhanced stability and dispersion. For instance, UiO-66 MOFs functionalized with biomacromolecules follow an enhanced cell endocytosed mechanism. NMOFs can also be polymer functionalized by GraftFast methodology, e.g., PEGylated MIL-100(Fe); besides, the radical polymerization mechanism is frequently applied in developing polymer-wrapper NMOFs [76]. Molecularly imprinted polymer (MIP)-coated MOFs with on/off luminescent behavior have been developed for the selective detection of species in biological environments. Several MIP-wrapped NMOFs have also been developed as DDS, representing controlled release behavior and merit for oral administration [77].
Magnetic bio-MOFs are a broad class of NMOFs employed for cancer therapy. This group of NMOFs can be distinguished based on its mechanism, which supports higher relaxivity and enhanced sensitivity in MRI with respect to unmodified magnetic (MOF-free) nanoparticles. There are several examples, including gold-incorporated MOFs for magnetic resonance imaging (MRI) and PTT for breast cancer treatment [78], target-specific anticancer ZIF-8/enzyme hybrid MOFs with minimal damage to the healthy cells [79], Fe3O4@bio-MOF-folic-acid-chitosan conjugate (FC) hybrid structures as theranostic in breast cancer [80], Zr-MOF@glucose-6-phosphate applied in kidney cancer treatment [81], highly selective and sensitive Cu-MOFs for liver cancer therapy [82], Fe3O4@nickel-cadmium quantum dots (QDs)/MOFs as a biosensor for prostate cancer diagnosis [83], and Fe3O4@5-aminolevulinic-acid-Zn MOF for MRI and brain tumor therapy [84]. There are also several disparate papers on the design, synthesis, and application of complex core-shell MOFs and flexible MOF-based theranostic nanoplatforms, mainly for multimodal imaging technologies.

5. Conclusions, Challenging Features, and Future Perspectives

MOFs are highly porous biocompatible tailorable hybrid structures with therapeutic effects on cancerous cells and tumors as a result of their ability to encapsulate cargos (drugs, proteins, genes, etc.). The use of MOFs in cancer therapy is experiencing an early stage of development because their immune response activation is still inadequate for efficient cancer treatment. Despite the potential of using a bewildering array of materials and elements (individually or in the form of core/shell, hybrid, and functionalized multiple structures) to be employed in MOF synthesis, optimizing such structures for targeted therapy requires the examination of a variety of scenarios. This challenge is, in a complex manner, compounded with the inadequate efficacy of drugs encapsulated in MOFs when it comes to being encapsulated in large amounts within the framework, and difficulties associated with targeting cargos under modulated release rate at the cancerous zone.
In other words, therapeutic drugs can partially attack tumor sites; moreover, distinguishing cancer cells from normal cells without damage to the healthy tissues and organs is not easily achievable. The use of NOMFs to an acceptable level compensates for such an inability. Traditional therapeutics such as radiotherapy and chemotherapy principally suffer from an uncontrolled attack on cancer cells. In contrast, phototherapeutics, to a large extent, are targeted at cancer sites. PTT and PDT techniques are widely used in cancer therapy, while chemotherapy, radiotherapy, and combined methodologies have also been implemented to treat cancer, mainly bone, breast, and colon cancers. Nevertheless, a long road must be traveled to overcome the limited translation of NMOFs to clinical therapies by designing target-specific tailored NMOFs for targeted actions, which we hope to witness in the near future.

Author Contributions

Conceptualization, M.R.S., N.R., F.V., L.G.V. and M.M.; Writing—original draft, M.R.S.; Writing—Review and Editing, M.R.S., N.R., M.M., R.L., F.V. and L.G.V.; Supervision, M.R.S., N.R. and R.L. All authors have read and agreed to the published version of the manuscript.

Funding

This paper has been supported by RUDN University Strategic Academic Leadership Program (L.G.V.).

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

Not applicable.

Conflicts of Interest

The authors declare no conflict of interest.

Abbreviations

Metal-organic frameworks: MOFs; nano-MOFs: NMOFs; magnetic resonance imaging: MRI; optical imaging: OI; computed tomography: CT; positron emission tomography: PET; photodynamic therapy: PDT; photothermal therapy: PTT.

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Materials 14 07277 g001 550
Figure 1. Main scope of this perspective regarding the use of MOFs-based nanomaterials for advanced cancer therapy.
Figure 1. Main scope of this perspective regarding the use of MOFs-based nanomaterials for advanced cancer therapy.
Materials 14 07277 g001
Table
Table 1. MOF classification for bioimaging and related applications.
Table 1. MOF classification for bioimaging and related applications.
Type of MOFImaging Method and Biomedical ApplicationRef.
UCNP@Fe-MIL-101-NH2Optical Imaging (OI)/magnetic resonance imaging (MRI)- Cancer therapy- Tumor imaging[16]
DOX@NPMOFsOI- Tumor imaging- Cancer diagnosis- Cancer therapy[17]
DOX@Gd-MOFs-GluComputed tomography (CT)/MRI- Cancer therapy- Tumor imaging- Targeted delivery of cancer drug[18]
TPZ/Hf/TCPP/PEGCT—Cancer therapy- Tumor imaging- Targeted delivery of cancer drug[19]
Eu, Gd-NMOF@SiO2MRI- Cancer therapy- Tumor imaging[20]
Fe3O4@IFMOF-3/FAMRI- Cancer therapy- Tumor imaging[21]
UiO-66@DOPA-LBOI- Tumor imaging- Cancer diagnosis- Cancer therapy[22]
Fe3O4-ZIF-8MRI- Cancer therapy- Tumor imaging- Early detection of tumor sites[23]
MOF@HA@ICG NPsMRI- Cancer therapy- Tumor imaging- Early detection of tumor sites[24]
Au@MIL-88 (Fe)CT/MRI- Cancer therapy- Tumor imaging- Targeted delivery of cancer drug[25]
89Zr-UiO-66/Py-PGA-PEG-F3Positron emission tomography (PET) imaging- Cancer therapy- Tumor imaging- Targeted delivery of cancer drug[26]
Table
Table 2. A literature survey on NMOFs in individual cancer therapy.
Table 2. A literature survey on NMOFs in individual cancer therapy.
MethodNMOFsIn Vitro Cell LinesIn Vivo ModelsRef.
ChemotherapyCisplatin@NMOF-1/DOX@NMOF-1HeLa-[35]
DOX@NMOF-VEGF responsiveMDA-MB-231-[36]
ZIF-8/FA@UCNPHeLa-[37]
UiO-67/UiO-66U-87 MG/HSC-3-[38]
Fe-MIL-53-NH2-FA-5-FAM@5-FUMGC-803-[39]
UiO-68-FA@DOXHepG2Mice with HepG2 tumors[40]
Gd-MOF-Glu@DOXHeLaMice with HeLa tumors[18]
IRMOF-3@Fe3O4/FAHea-[21]
ZIF-8@PMDA-MB-231-[41]
ZIF-8@Fe3O4MCF-7-[42]
89Zr-UiO-66@Py-PGA-PEG@F3MDA-MB-231Mice with MDA-MB-231 tumors[26]
Fe3O4@IFMOF-3@OCMP@FAHeLa-[43]
DPB-UiO-based NMOFsHeLa, MCF-7 and etc.Mice with HeLa and MCF-7 tumors[44,45]
RT-RDTW18@Hf12-DBB-IrMC38/CT26Mice with MC38/CT26 tumors[46]
DBB-Ru-HfMC38/CT26Mice with MC38/CT26 tumors[47]
PTTUiO-66@PANCT26/HCT116Mice with CT26 tumors[48]
Mn-IR822@PEG-PDA4T1Mice with 4T1 tumors[49]
MOF@ICG@HAMCF-7Mice with MCF-7 tumors[24]
PDTTi-TBPCT26Mice with CT26 tumors[50]
PCN-FA-224A549/HeLa-[51]
UiO-DBCHT29/CT26Mice with HT29/CT26 tumors[52]
MB@THA-MOF-76@cRGDA549-[53]
MOF-FA@PSHeLa-[54]
UiO-DBPSQ20BMice with SQ20B tumors[55]
PCN-224 (Pt)4T1/HeLaMice with H22 tumors[56]
NP-1HCT116/HepG2Mice with HCT116 tumors[57]
ZnDTPP-I2@UiO-66HepG2-[58]
TPP-SH@UiO-66HeLa-[59]
Ru(bpy)32+@(UiO-67)A549-[60]
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Saeb, M.R.; Rabiee, N.; Mozafari, M.; Verpoort, F.; Voskressensky, L.G.; Luque, R. Metal–Organic Frameworks (MOFs) for Cancer Therapy. Materials 2021, 14, 7277. https://doi.org/10.3390/ma14237277

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Saeb MR, Rabiee N, Mozafari M, Verpoort F, Voskressensky LG, Luque R. Metal–Organic Frameworks (MOFs) for Cancer Therapy. Materials. 2021; 14(23):7277. https://doi.org/10.3390/ma14237277

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Saeb, Mohammad Reza, Navid Rabiee, Masoud Mozafari, Francis Verpoort, Leonid G. Voskressensky, and Rafael Luque. 2021. "Metal–Organic Frameworks (MOFs) for Cancer Therapy" Materials 14, no. 23: 7277. https://doi.org/10.3390/ma14237277

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