Published online Aug 15, 2023. doi: 10.4251/wjgo.v15.i8.1342
Peer-review started: May 11, 2023
First decision: May 31, 2023
Revised: June 11, 2023
Accepted: July 11, 2023
Article in press: July 11, 2023
Published online: August 15, 2023
Processing time: 91 Days and 13.2 Hours
Curcumin is a natural compound with a diketone structure, which can control the growth, metastasis, recurrence, neovascularization, invasion, and drug resistance of gastrointestinal tumors by inhibiting nuclear factor κB, overexpression of tumor cells, vascular endothelial growth factor, etc. However, due to the low bioavailability of curcumin formulation, it did not fully exert its pharmacological effects, and its application and development in the treatment of various malignant tumors are still limited. This review summarizes the research on drug delivery systems of curcumin combating digestive tract tumors in order to further reduce the toxic side effects of curcumin-containing drugs and fully exert their pharmacological activities, and improve their bioavailability and clinical value.
Core Tip: Curcumin can control the growth, metastasis, recurrence, neovascularization, invasion, and drug resistance of gastrointestinal tumors by inhibiting nuclear factor κB, overexpression of tumor cells, and vascular endothelial growth factor. It is important to clarify the application value of curcumin by different drug delivery systems to optimize the treatment of gastrointestinal tumors.
- Citation: Wu X, Yang Y. Research progress on drug delivery systems for curcumin in the treatment of gastrointestinal tumors. World J Gastrointest Oncol 2023; 15(8): 1342-1348
- URL: https://www.wjgnet.com/1948-5204/full/v15/i8/1342.htm
- DOI: https://dx.doi.org/10.4251/wjgo.v15.i8.1342
As the detection rate of advanced gastrointestinal tumors continues to rise, combination chemotherapy regimens, such as paclitaxel, capecitabine, and cisplatin, have become necessary to prolong patient survival[1,2]. However, many chemotherapy drugs have poor tumor selectivity and often have severe toxic side effects, which can damage the immune system's defense and regulatory functions and even make patients unable to tolerate subsequent treatments or develop drug resistance[3,4]. Moreover, the cost of chemotherapy combined with molecular targeted therapy is high, and patients have a low acceptance rate, making it unsuitable for widespread clinical use[5]. Compared with conventional chemo
Drug delivery system | Structure | Advantage | Disadvantage | Common types |
Polymer | Shell-core structure | Hydrophobic, high and precise drug concentration with low side effects | Poor water solubility | Bioadhesive micelles, active targeting micelles, etc. |
Liposome | Lipid bilayer microvesicle carriers | Diversity, targeting, lymphatic targeting, liver protection, etc. | High cost | Unilamellar liposomes, multilamellar liposomes, liposome gel, etc. |
Microsphere | Shell-core structure | Covering bad odors, avoiding incompatible combinations, high stability and safety | Relatively short duration and relatively large drug dosage | Conventional injection microspheres, occlusive microspheres, magnetic microspheres, etc. |
Nanoparticle (NPs) | Shell-core structure | Amphiphilic, controllable loading effect, long half-life, etc. | Low solubility of inorganic NPs | Lipophilic NPs, nanocapsules, nanospheres, and inorganic NPs, etc. |
Nanogel | Intramolecular cross-linked polymer | Anti-fouling, antibacterial, targeting, small size, easily penetrating cells, etc. | No obvious disadvantage | pH-responsive hydrogels, hyaluronic acid hydrogels, copolymer hydrogels |
Cyclodextrin | Bimolecular complex | High water solubility, low toxicity, high stability | No obvious disadvantage | α-cyclodextrin, β-cyclodextrin, partially methylated-β-cyclodextrin, etc. |
Micelles polymer micelles are a thermodynamically stable colloidal solution with a shell-core structure. The core can carry hydrophobic drugs and effectively reduce the degradation loss of drugs, enhance the drug permeability and retention, and thus increase the concentration of drugs in the target site or accumulate the drugs in specific areas, thereby strengthening their killing effect on tumor cells and significantly reducing the toxic side effects on normal cells and tissues[10,11]. Compared with traditional drug delivery systems, curcumin micelles can not only improve the uptake rate of drugs by tumor cells but also select appropriate micelles based on the specific conditions and related symptoms of tumor patients, such as bioadhesive micelles, active targeting micelles, pH-sensitive micelles, and reversal of multidrug-resistant micelles[12]. In immunotherapy of osteosarcoma, Jin et al[13] found that dichloroacetic acid mitochondrial-targeted polymer micelles could induce cell apoptosis by initiating the mitochondrial oxidative stress response, enhancing immunity, and inhibiting the tumor microenvironment. In addition, by designing the hydrophobic core of polymer micelles and the hydrophobic membrane of the vesicles, the shell-core structure becomes a photocatalyst, which can effectively avoid the attack of photodynamic oxygen on enzymatic substances, keep the enzyme in an active state, and thus enhance the biocompatibility and activity of the delivery system[14]. It should be noted that comprehensive tests on encapsulation efficiency, particle size, drug loading, and drug release rate within 48 h are required to prepare curcumin polymer micelles to the fullest extent possible to overcome its poor water solubility and maximize its anti-tumor effects.
Liposomes are lipid bilayer microvesicle carriers that can encapsulate multiple drugs and have good targeting and lymphatic directionality. Compared with ordinary carriers, they can not only delay renal metabolism, reduce drug toxicity but also serve as passive targeted drugs for the reticuloendothelial system, thus protecting the liver and improving drug efficacy[15]. In a mouse experiment, Li et al[16] compared several different curcumin drug delivery systems and found that mice given curcumin liposomes had greater improvements in hepatic steatosis than control group mice or mice given curcumin suspensions, and smaller abdominal adipocytes. In the study of digestive tract tumors, curcumin analogs, unlike non-steroidal anti-inflammatory drugs, have important value in regulating the cancer gene pathway, and cause fewer adverse reactions such as mucosal bleeding and gastrointestinal ulcers[17]. When curcumin acts on gastric or colorectal cancer, it can regulate the cell's anti-inflammatory, anti-cell apoptosis and antioxidant mechanisms through signal pathways such as DNA methylation, nuclear factor-erythroid 2-related factor 2, and histone modification, thus regulating the transcription of factors, such as heme oxygenase-1, Bcl-2, Bcl-xL, delaying tumor progression, and achieving multi-organ protection[18,19].
Microspheres, also known as microcapsules, are miniature spherical capsules made of polymeric materials that encapsulate or adsorb solid or liquid drugs. Their outer shell can mask the unpleasant odor of drugs, prevent contraindications in complex formulations, and reduce the stimulatory effects of chemotherapy drugs on the gastrointestinal mucosa[20]. The most commonly used microencapsulation method in clinical practice is to develop sustained-release and targeted drugs to control disease progression or symptoms. Some microspheres can also embed live cells and biologically active blood substances to prevent them from denaturing or becoming ineffective[21]. Researchers extracted proteins from lotus seeds and used them to encapsulate curcumin[22]. They found that at a concentration of 50mg/mL, the encapsulation rate of curcumin was 86.32%. After digestion in the gastrointestinal tract, the cumulative release rate of curcumin-LSP was 64.3%, while that of curcumin-LSP-pectin particles was 72.4%. Moreover, the dissolution rate of curcumin-LSP-pectin particles was relatively higher. Thus, microencapsulated compounds have a higher application value.
Nanoparticles (NPs) can penetrate into membrane cells, spread along nerve synapses and lymphatic vessels, and selectively accumulate in different cells and some cell structures[23]. According to their different shell-core structures and materials, NPs are divided into multiple drug delivery systems, such as lipophilic NPs, nanocapsules, nanospheres, and inorganic NPs. Their carriers can be hydrophobic or hydrophilic compounds, as well as small molecules, biomacromolecules, proteins, and vaccines[24]. Moreover, by adjusting the composition, stability, reactivity, and surface charge of NPs and carriers, the loading effect and release kinetics of drugs can be precisely controlled[25]. Lushchak et al[26] pointed out that nanoparticles carrying various plant bioactive compounds had a longer half-life than traditional formulations and could improve the permeability of epithelial cells and delayed cellular aging. Nabila et al[27] used nanolipid technology to prepare nano-curcumin and compared it with curcumin solution, proving that nano-curcumin had greater antiviral potential. It is worth noting that inorganic NPs synthesized from materials, such as gold, iron oxide, and silicon dioxide, have unique value in diagnosis, arterial imaging, photothermal therapy, and sonodynamic therapy. However, due to their toxicity and low solubility, the clinical application of such NPs still has certain limitations[28]. Dutta et al[29] coated the anionic surfactant sodium dodecyl sulfate (SDS) on the surface of hydrophobic Fe3O4 (oleic acid modified) nanoparticles to prepare a surface-active agent-stabilized, highly water-dispersible Fe3O4 magnetic nanocarrier (SMNC) capable of simultaneously carrying hydrophobic and hydrophilic anticancer drugs. Doxorubicin is adsorbed onto the surface of the nanocarrier by electrostatic interactions, while curcumin is encapsulated in the hydrophobic intermediate layer between oleic acid and SDS. The drug carrier has high drug loading capacity, good sustained release performance, and good cellular uptake ability. In addition, the drug carrier exhibits excellent heating ability under an alternating magnetic field and can be used as an effective heat source for hyperthermia.
Nanogel is a type of intramolecular cross-linked polymer with a particle size generally within 1000 nm. It has an internal network structure and can be dispersed into nanoscale hydrogel particles in aqueous solutions[30]. It can also be used as anti-fouling and antibacterial surface coatings, reducing the adhesion of bacteria and viruses on medical materials. The pH in the normal physiological environment of the body differs significantly from that outside the tumor cells, resulting in a significant redox potential difference between the inside and outside of the cells. However, monodispersed nanoscale hydrogels can respond specifically and accurately to the pH and redox potential differences between tumor tissues and normal tissues, creating conditions for targeted delivery of drugs to cancer sites[31,32]. Chemotherapy combined with immunotherapy is currently a popular method for treating mid-to-late-stage tumors. Its main goal is to promote the death of immunogenic cells, activate the powerful function of the immune system, and achieve the purpose of inhibiting tumor growth and improving the immunosuppressive tumor microenvironment[33]. Ma et al[34] prepared mannitol nanogels based on polyβ-amino esters to treat breast cancer and found that it could overcome the limitations of immunotherapy. Therefore, nanogels can achieve specific co-delivery of tumor drugs.
Cyclodextrin is a cyclical oligosaccharide derived from starch. By appropriately modifying it chemically, amorphous or partially crystalline derivatives such as α-cyclodextrin, β-cyclodextrin, partially methylated-β-cyclodextrin, etc., can be formed, which can significantly improve its water solubility and greatly reduce its gastrointestinal toxicity[35]. Among them, the inclusion complex of hydroxypropyl-β-cyclodextrin and curcumin has not only a high inclusion rate and high solubility, but also a 2.8-fold increase in bioavailability compared to ordinary curcumin preparations, and the concentration in the brain increases by 38.7-fold, showing a significant antiepileptic effect[36]. In addition, Chen et al[37] showed that curcumin-cyclodextrin complex has a protective effect on H2O2-induced LO2 cell damage, can effectively inhibit the overexpression of caspase-3, and alleviate liver, kidney, brain and skeletal muscle damage. This indicates that preparing curcumin-cyclodextrin inclusion complexes according to the chemical and biological properties of drugs can alleviate liver, kidney, and nerve toxicities during anti-tumor chemotherapy. In the study of curcumin solubility, the antioxidant activity of curcumin inclusion complexes formed with β-cyclodextrin and polyvinylpyrrolidone (PVP) was (96.02 ± 2.46)%, while the antioxidant activity of pure curcumin was only (58.02 ± 2.21)%. This shows that designing curcumin-β-cyclodextrin complexes with PVP can further improve the in vivo activity of curcumin[38].
Developing drug delivery systems for curcumin, such as micelles, complexes, solvent-free pH-driven capsules, and gels, to fully enhance its effectiveness and develop therapeutic or functional products, has become one of the choices to promote overall health and increase tumor remission rates[39]. However, despite the current clinical research in gastrointestinal tumors, the efficacy of curcumin remains uncertain (Table 2)[40-43]. In addition to the studies shown in the table, Hipólito-Reis et al[44] demonstrated that by reducing the release and production of inflammatory mediators using curcumin, curcumin can lower cell proliferation, blood vessel growth, invasion, and adhesion, or regulate cell apoptosis, lipid metabolism mechanisms, etc., which can effectively improve the occurrence and development of endometriosis and achieve long-term control or clinical cure[45,46]. Meanwhile, the invasion and proliferation of tumor cells can also promote the secretion of multifunctional chemokines such as TNF-α, IL-6, IL-8, IL-10, decrease pain thresholds, and promote inflammatory exudation and necrosis of local lesions. Therefore, Nanavati et al[47] believe that supplementing 90-5000 mg curcumin daily can effectively improve subjective pain perception and increase the body's antioxidant capacity.
Cancer type | Study category | No. | Dosage regimen | Results |
Colorectal cancer[37] | Phase II, randomized double-blind study | 22 | Capecitabine 825 mg/m2, Bid; curcumin 4 g, Bid | Curcumin does not increase the remission rate of patients |
Esophageal cancer[38] | Controlled trial | 1 | Group A: 20 µg/mL curcumin-containing culture; Group B: 2 µg/mL Vincristine-containing culture; Combined group: 20 µg/mL curcumin+2 µg/mL vincristine-containing culture | Curcumin reverses multidrug resistance of esophageal cancer cells |
Metastatic colorectal cancer[39] | Phase IIa, randomized controlled trial | 28 | Control group: FOLFOX1; Research Group: FOLFOX + curcumin 2 g/d | Curcumin plus FOLFOX regimen significantly improves chemotherapy tolerance and safety |
Advanced gastric cancer[40] | Randomized controlled trial | 56 | Control group: FOLFOX; Research Group: FOLFOX + curcumin 25 µmol/L, 1/d | Curcumin plus FOLFOX regimen significantly improves clinical remission rate and reduces toxic side effects |
The anti-tumor effect of curcumin is closely related to multiple mechanisms. When it acts on the signaling pathway of various cytokines, it can exert different regulatory functions, thereby regulating immunity and inflammation, protecting cells, and inhibiting tumor growth. For specific cancer patients, the development of curcumin delivery systems can significantly enhance the targeting and long-circulating effects of the drugs. Polymer micelles, liposomes, and microspheres have considerable advantages, but this article did not provide a detailed analysis of their drawbacks, and it is not entirely clear how to choose the material and type of drug delivery systems. Therefore, in future research, the application value of curcumin by different drug delivery systems needs to be further analyzed to optimize the treatment of gastrointestinal tumors.
Provenance and peer review: Unsolicited article; Externally peer reviewed.
Peer-review model: Single blind
Specialty type: Oncology
Country/Territory of origin: China
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P-Reviewer: Iruarrizaga-Lejarreta M, Spain; Sledzinski T, Poland S-Editor: Yan JP L-Editor: A P-Editor: Yan JP
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