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298 Nicole Remaliah Samantha Sibuyi et al.
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activities and the extracellul ar environment, such temperature changes inside cells are usually on a small scale and transient, making them difficult to measure. As a re­sult, developing customized thermo-responsive CDs carriers based on these internal temperature differences remains uncertain. Along these lines, heat-susceptible car­riers can be created by using an external heat source [81]. Exogenous stimuli, such as photo- and ultrasound-responsive NPs that destabilize when exposed to a specific wavelength of light, were also explored. Many studies have emphasized the delivery of drugs via dual- or multi-responsive nanocarriers, with the combination of stimuli working synergistically and methodically for efficient drug release, such as pH/redox-, pH/enzyme-, and pH/light-responsive drug carriers [79].
13.7.1 Stimuli-responsive drug release from CDs
13.7.1.1 pH stimuli-responsive drug release
pH discrepancy is prevalent in many parts of the human body as summarized in Table 13.3, and is critical to CDs’ functionality and often explored for controlled drug release. This distinction, particularly the lower pH levels in tumour cells under cer­tain conditions such as increased glycolic pathway and lactic acid production, has been used to develop pH-sensitive CDs. These pH susceptibilities were processed through the disruption of certain bonds that the CDs are equipped with, resulting in the release of the drug that is normally protected under physiological environment. Evidently, DOX release from CD–DOX was higher at lower pH (pH 5.0, 82%) compared to pH 6.8 and 7.4 [10].
Table 13.3: pH pertaining to different human body parts.
Body part pH
Stomach – Colon Lysosomes .– Endosomes .– Cytosol .
pH sensing is considered a highly beneficial property of CDs. CD–DOX pH-responsive nanoconjugate resulted in approximately 12% of the DOX released from the CDs in vitro at pH 7.2, while 4% of the drug was released at pH 5.8. Using a pH that mimics the tu­mour environment as a trigger for drug release ensures that the drug reaches the target site in its intact form and that the drug effects are confined to the tumour site [82]. In a similar strategy, DOX loaded in HCDs demonstrated an improved DOX release profile
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from HCD-based nanocarriers at pH 5.0 which mimics the acidic environment of intra­cellular lysosomes when compared to the physiological environment (pH 7.4). The HCD nanocarriers only released 4% of the drug at pH 7.4, while 70% of the drug was released at pH 5.0 [70]. The CDs produced from Daucus carota subsp. sativus (carrot) roots used hydrogen bonding to couple mitomycin, a chemotherapy drug used to treat cancers; breakage of the hydrogen bonding at the mildly acidic tumour extracellular microenvi­ronment (pH ~ 6.80) caused the release of mitomycin [83].
CDs@MSN-DOX nanohybrid also demonstrated the ability to increase DOX release under slightly acidic conditions (pH 5.0) at 37 °C. The CDs@MSN-DOX nanohybrid was internalized by HeLa cells after 2 h and was found primarily in the lysosomes, where the low pH (pH 5.0) triggered DOX release from the nanocarrier, resulting in cell death [84]. CD–DOX resulting from electrostatic interaction between positively and negatively charged functional groups on CDs and DOX also dissociated as the pH value decreased. The carboxyl groups on the surface of CDs were gradually protonated, and the electro­static interaction between DOX and CDs was gradually weakened, increasing the rate and amount of DOX released [71]. The surface charge of the CDs can be controlled using pH. This behaviour has been reported to alter drug release at different pH levels. pH­responsive CDs were produced by modifying their surface with zwitterionic molecules, which have a positive charge at low or acidic pH and change to a negative charge when exposed to high or basic pH. As a result of the CDs changing conformation in the acidic environment of the tumour cells (pH 6.5–6.9), the therapeutic agents were released [38, 85]. Notably, the CDs-MSN nanohybrid loaded with DOX and capped with a zwitterionic antibiofouling layer allowed DOX release when subjected to a pH of the tumour extra­cellular fluid. In this way, DOX release was controlled and occurred only at pH 6.8 after enzymatic removal of polycaprolactone (PCL); the MSN gate keeper prevented early drug release. This was evident because nothing happened for 5 days, and when esterase was added on day six, 90% of the drug was released within 3 days. To prove that the DOX release was dependent on both pH and enzyme, when the MSN-CDs were subjected to pH 7.4 in the presence of the enzyme or pH 6.8 buffer without the enzyme, ~ 15% of the drug was released after 28 days [38].
In addition to chemotherapy, CDs can be used to deliver and release other thera­peutic agents such as antibiotics [54, 55] and antipsychotic drug [53]. CD-coated alginate beads (CA-CDs) were produced by electrostatic interactions between the positively charged CDs and negatively charged alginate, and used as nanocarriers for tetracycline (TC) and TC associated with β-cyclodextrin. After 96 h at pH 1, the CA-CDs released 70% of TC, indicating their applicability in the gastrointestinal tract [54]. In another study, CDs loaded with the broad-spectrum antibiotic ciprofloxacin (Cipro@CDs) could release the antibiotic under physiological conditions (pH 7.4); the release profile was sustained for 24 h. Cipro@CDs demonstrated time-dependent and controlled release of Cipro as well as potent antibacterial activity against both gram-positive and gram-negative strains [55]. Furthermore, CDs were used to deliver HaLO; a constant HaLO release from the nanocarrier was achieved for more than 40 h under physiological conditions
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(pH 7.4). The HaLO release profile from CDs was found to have an initial burst in the first 4–5 h, followed by a sustained release for up to 40 h [53].
13.7.1.2 Redox stimuli-responsive drug release
Normal cells have a significantly lower redox potential than tumour cells, and this dif­ference exists between the intracellular and extracellular environments. The cellular redox environment is known to be primarily regulated by GSH levels. GSH is a thiol compound found in high concentrations, ranging between 5 and 10 mM, in the cyto­plasm of mammalian cells. GSH deficiency always increases susceptibility to oxidative stress, whereas GSH excess generally increases antioxidant capacity and oxidative stress resistance [79]. As a result, intracellular GSH may be a promising stimulus for triggering drug release from CDs.
A redox-responsive MSN capped by fluorescent CDs showed controlled DOX re­lease by exploiting their sensitivity towards the intracellular GSH. The CDs that were electrostatically anchored onto the surface of the MSNs blocked the pores of the MSNs and prevented the leakage of DOX. When GSH was added to the physiological environ­ment, the integrity of the system was disrupted due to the breakage and detachment of the disulphide bonds, resulting in the rapid release of DOX [86].
13.7.1.3 Temperature stimuli-responsive drug release
CDs are often used with other systems to create thermo-responsive nanohybrid car­riers; most times, thermosensitive polymers such as poly(N-isopropyl acrylamide) and poly(methyl vinyl ether) [2] and other nanosystems [87] are used in conjugation with CDs to prevent drug leakage and ensure controlled release. A thermo-responsive CD­hydrogel nanocarrier for diclofenac demonstrated controlled drug release mediated by an external source. Drug release relied on the thermo-susceptible hydrogels after topi­cal administration in the eyes of the rabbits. CDs fluorescent in various ocular tissues (cornea, crystalline lens, sclera, and conjunctiva) was an indication that diclofenac was distributed in these tissues [87]. Thus, in situ or external temperature variation from other systems, and not directly from the CDs, can also be exploited in the development of thermo-responsive CD-based DDS.
13.7.1.4 Light stimuli-responsive drug release
Light-responsive DDS that operate at different wavelengths have been reported. UV light has poor tissue penetration, so it is generally replaced by NIR wavelengths, which not only ensure better tissue penetration but are also safe for in vivo use [88].
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Owing to the intrinsic photothermal conversion ability of CDs, NIR laser irradiation could also be used to enhance drug release from the nanocarriers. The increase in temperature in the local tissues will help with the detachment of the drug. CD–DOX exhibited strong absorbance in the NIR region with higher photothermal conversion efficiency. The NIR light-stimulated DOX release, allowing for drug accumulation in the cancer cells, and increasing the drug’s effectiveness in killing the cancer cells. Wang et al. created a CD– -nanohybrid loaded with DOX; the nanohybrid was com­posed of magnetic iron oxide (Fe
) nanocrystals and fluorescent CDs, with the Fe3O
3O4
nanocrystals clustered in the core and the CDs implanted in the porous carbon shell. DOX release profile from Fe
@CDs was monitored in the dark und er NIR irradia-
3O4
tion. The kinetics of DOX release from the nanocarrier proceeded slowly and almost steadily. Irradiation with NIR light significantly increased the rate of DOX release from the hybrid nanocarrier [89].
Another photo-responsive system, the nitrogen-doped and PEG200-coated CDs initi­ated delivery of DOX in human breast cancer (MCF-7) cells via NIR two-photon excitation. Under NIR laser irradiation, DOX was successfully released from the CDs, subsequently contributing to enhanced cell death. These findings implied that NIR could be used to control the rate of DOX release from the CD nanocarriers [90]. Other light sources have been investigated in addition to NIR irradiation. Qucbl-CDs demonstrated light-controlled
−2
drug release mediated by W light (≥365 nm, Hg-vapour lamp, 120 mW cm
−2
laser (5 mW cm
). Approximately 73% and 20% of Qucbl was released after 30 min of
)andHe–Ne
irradiation with W light and He–Ne laser, respectively [91].
4
13.7.1.5 Multiple stimuli-responsive CDs for drug release
To create potent formulatio ns, multiple stimuli-responsive agents have been used to trigger drug release. These triggers can be a combination of endogenous stimuli, exog­enous stimuli, or a combination of both endogenous and exogenous stimuli. This is currently being investigated to improve the efficiency of these systems [92]. pH- and enzyme-responsive CD-MSN-DOX hybrid relied on the tumour pH to remove the zwit­terionic layer that prevented formation of protein corona on the surface, and the es­terases to degrade the PCL and release DOX from the MSNs. The low pH was the first and vital trigger which then allowed esterase an access to the PCL and controlled DOX release. On the contrary, the enzyme at high pH conditions failed to degrade the PCL and no drug release was observed, thus indicating a highly selective drug release per­formance to tumour tissue [38].
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13.8 Biocompatibility and cytotoxicity of CDs
CDs are smaller in size, with a diameter less than 10 nm and can easily interact with vari­ous cellular organelles and induce cellular damage. They are presumed to be biocompati­ble and have reduced toxicity compared to other QDs synthesized from semiconducting materials [93] and toxic metal compounds, because they are synthesized from carbon, one of the building blocks of nature [56, 94, 95]. Thus, CDs are biocompatible and safer for the living organisms and the environment. Several in vitro and in vivo studies have been done to evaluate the toxicity of CDs using mammalian (normal vs cancerous) cell lines, as well as animal models with remarkable results. The biocompatibility and safety of CDs are dependent on factors such as the methods of synthesis, surface composition, and surface charge. CDs synthesized through hydrothermal methods were shown to be non-toxic to normal breast (MCF-10A) cell line compared to calcination- and microwave­based CDs. The latter showed time-dependent cytotoxicity effects, while the hydrother­mal synthesized CDs remained non-toxic up to 72 h at concentrations ≤4mgmL CDs synthesized by the hydrothermal treatment of folic acid and kappa-carrageenan (FKC-CDs) had negligible haemolytic effect of 2.71% (haemolysis values <10% are in the
–1
accepted range) at 600 μgmL FKC-CDs up to 600 μgmL
, and thus have good overall blood biocompatibility. The
–1
showed no visible reduction in the viability of HeLa and nor­mal fibroblast cells, suggesting that the FKC-CDs have no cytotoxic and no anticancer ac­tivities [97]. CDs synthesized by the hydrothermal treatment of
phenylenediamine with
p-
various metal ions as catalysts produced non-toxic CDs: pPCDs, Ag−pPCDs, Cu−pPCDs, Pt−pPCDs, Fe−pPCDs, Pd−pPCDs, and Ni−pPCDs. The metal ions were undetected in the final products, and the CDs were considered as biocompatible as they did not contain metal elements which tend to be cytotoxic. Out of all the CDs, the Ni−pPCDs showed better phy sicochemical and PL properties than the rest, with cell viabilities ~ 80%
–1
at ≤50 μgmL
of Ni−pPCDs in both normal (AT II) and lung cancer (A549) cells. In a mouse model, the Ni−pPCDs accumulated mostly in the tumour site and had no notable accumulation in the major organs such as the heart, liver, spleen, lungs, and kidneys [98]; further certifying the biocompatibility of the CDs. Many other studies also demon­strated the non-cytotoxic nature of CDs synthesized through different methods in both normal and cancer cell lines [93, 99–101]. The unloaded CDs did not show any toxicity on both normal (HL-7702, H9C2, HUVEC) and cancer (HeLa, HepG2, MCF-7) cells at con-
–1
centrations up to 100 µg mL
from 0–96 h [3]. Similarly, CDs were shown to have no
cytotoxic effects on the mouse fibroblast (L929) and MCF-7 cells at concentrations up to
0.5 mg per mlat 24 and 48 h [10].
–1
[96].
13.8.1 Selective toxicity of drug-loaded CDs
Due to their non-cytotoxic and biocompatible nature, CDs were used in drug delivery applications to improve the performance and the therapeutic index of certain drugs.
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Anticancer drugs such as DOX are non-selective in their action towards both cancer and normal cells. However, when they are loaded into CDs their cytotoxicity to nor­mal cells was significantly reduced, while their anticancer activity was enhanced. To demonstrate this effect, the D OX-loaded CDs (CD–DOX) compared to unloaded CDs
–1
had no cytotoxic effect in L929 cells at ≤600 µg mL
for 24–72 h of treatment. The un­loaded CDs had negligible cytotoxicity towards L929 cells, while the free DOX and the CD–DOX at 1.5 μM DOX showed differential activities. The free DOX significantly re­duced cell viability in the L929 cells compared to the treatment with the CD–DOX at all the time points. This suggested that the cytotoxic effect of DOX was reduced when it was loaded into the CDs and could potentially mean that the side effects exhibited by free DOX onto normal cells can be minimized when the drug is loaded on CDs. Also, in the cancerous ACC-2 cells, CD–DOX exhibited a higher antitumor activity than free DOX at all the time points. This effect was more pronounced in the 72 h treatment resulting in 5% ACC-2 cell viability after treatment with the CD–DOX. The antitumor effect as well as the minimal cytotoxicity effect was attributed to the slow release of DOX from the CD– DOX [95]. Similarly, in an other study, CD–DOX at ≤500 µg mL
–1
showed no cytotoxic effect in the L929 cells at all time points. Moreover, no notable cytotoxicity or anticancer activity was observedinboththeL929andMCF-7cells treated with the unloaded CDs, at all investigated concentrations and time points. On the contrary, free DOX and CD–DOX reduced the viability of the MCF-7 cells. The re­duction was more pronounced in the CD–DOX treatments compared to the free DOX, with the IC tively, which were further reduced to be 0.652 and 0.356 µg mL
values of 0.983 and 0.939 µg mL–1of free DOX at 24 and 48 h, respec-
50
–1
at 24 and 48 h for
CD–DOX, respectively [10].
The cytotoxicity of CD–DOX was reported to be time- and concentration-dependent,
and showed similar or superior effects to free DOX. Their effects were significant from
–1
0.0625 µg mL
at 24 h and increased to 0.15625 µg mL–1at 48 h for the CDs-DOX in the cancer cells. Both the unloaded CDs and CD–DOX were shown to be equally taken in by the normal and cancer cells, and the CDs were able to offer some protection to the non­cancer cells. Their cytotoxicity was significantly reduced than that of free DOX [3]. The cytotoxicity of the CDs is also dependent on their biodistribution. Large amounts of CD–DOX intravenously injected in HepG2 tumour-bearing mice were located by the CDs fluorescence in the tumour and the kidneys after 24 h, with negligible amounts in the liver, spleen, heart, and lungs. This was an indication that the nanomaterials have some degree of biocompatibility and could be safe to use in vivo [3]. The CDs might not have long-term toxic effects on mice, as the histological analysis of vital tissues at the base­line, 7 and 21 days showed no changes in the morphology of these tissues [9].
The selectivity of drug-loaded CDs was also reported for other drugs such as epiru­bicin, temozolomide [102], mitoxantrone (MTO) [103], coptisine [94], and FAC [56]. In these four studies, it was evident that unloaded CDs had no cytotoxicity against the test cell lines, normal and diseased alike. The drug-loaded CDs also demonstrated some se­lective toxicity towards diseased cells [94, 102, 103]; with the exception of CD–FAC [56]
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and CD–temozolomide [102] which were non-toxic to both normal and diseased cells. Moreover, the drug-loaded CDs showed a significant cytotoxic effect on the cells than the free drugs in a dose-dependent manner [84, 93, 94]. In vivo studies showed no ap­parent changes in the size of the tumour as well as the weight of the mice treated with both free coptisine and CD-coptisine, indicating their biocompatibility and non-toxic ef­fect. Furthermore, the CD-coptisine only accumulated in the tumour site as opposed to other organs such as the spleen, heart, kidneys, and liver, further confirming the biocompatibility and non-toxic nature of the CD-coptisine [94]. In a study by Hettiar­achchi et al., multi-drug (epirubicin and temozolomide)-loaded CDs with or without targeting moiety (transferrin) compared to single drug-loaded-CDs with or without transferrin and the free drugs had enhanced cytotoxicity towards several cancerous (SJGBM2, CHLA266, CHLA200, and U87) cells lines. Of the single drug-loaded-CDs, only the CD-epirubicin reduced cell viabilitiesto17%and30%inallcellsat10μM while the CD-temozolomide had no notable cytotoxic effect at all tested concentra­tions in all the cancer cells. A targeting ligand (transferrin) enhanced the efficacy of the drug-loaded CDs even at lower drug concentrations [102].
From these studies, it is quite evident that decorating CDs with various biomole­cules can improve the selectivity of the CDs as well as the performance and delivery of the loaded drug [104]. Functionalization of CD–DOX with 4-carboxybenzylboro nic acid (CBBA; DOX/CBBA-CDs) reduced the cell viability in a concentration-dependent manner in HeLa cells, while the unloaded CDs and CBBS-CDs were non-cytotoxic up to
–1
400 µg mL
[71]. Furthermore, the use CDs with other DDS was shown to improve the delivery, performance, biocompatibility, and efficacy of the drugs. This was demon­strated by a CDs nanohybrid containing hyaluronic acid, disulphide bonds, and hMSNs (hMSN-SS-CD
@HA) for the delivery of DOX. The hMSN-SH and hMSN-SS-CD
PEI
PEI
@HA had no notable cytotoxic effect on both normal mouse fibroblast (NIH-3T3) and A549 cells. The hMSN-SS-CD
@ showed selectivity cytotoxicity towards the cancer cells
PEI
[105]. A number of studies can attest to the non-toxicity and potential biocompatibility of the unloaded CDs, and their ability to enhance drug effects.
13.9 Conclusion
CDs hold promise as an effective DDS, mainly due to the fact that they are made from biocompatible carbon precursors. Moreover, their exceptional physicochemical proper­ties encourage their dual bio-applications for construction of smart diagnostic and ther­apeutic agents. CDs have been timeously proven to be non-toxic an d biocompatible towards cells and animals. These desirable properties make CDs excellent DDS. They can transport their cargoes without exhibiting any bystander effects on neighbouring cells. Their flexibility to encapsulate or load drugs on their surface is especially appeal­ing and can be exploited for multiplexing. Additionally, CDs can be tailored to be
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stimuli-responsive and only release their cargoes in specified targets for more control over the drug kinetics. Thus, CDs as DDS can minimize bystander effects on the normal cells while inhibiting the growth and killing the targeted cells. All these events can be monitored in real time due to their PL and fluorescent prop erties. However, much work remains to be done to translate this technology into clinically viable systems.
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