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Review
. 2021 Feb 7;13(4):670.
doi: 10.3390/cancers13040670.

Recent Advancements in Stimuli Responsive Drug Delivery Platforms for Active and Passive Cancer Targeting

Affiliations
Review

Recent Advancements in Stimuli Responsive Drug Delivery Platforms for Active and Passive Cancer Targeting

Muhammad Abdur Rahim et al. Cancers (Basel). .

Abstract

The tumor-specific targeting of chemotherapeutic agents for specific necrosis of cancer cells without affecting the normal cells poses a great challenge for researchers and scientists. Though extensive research has been carried out to investigate chemotherapy-based targeted drug delivery, the identification of the most promising strategy capable of bypassing non-specific cytotoxicity is still a major concern. Recent advancements in the arena of onco-targeted therapies have enabled safe and effective tumor-specific localization through stimuli-responsive drug delivery systems. Owing to their promising characteristic features, stimuli-responsive drug delivery platforms have revolutionized the chemotherapy-based treatments with added benefits of enhanced bioavailability and selective cytotoxicity of cancer cells compared to the conventional modalities. The insensitivity of stimuli-responsive drug delivery platforms when exposed to normal cells prevents the release of cytotoxic drugs into the normal cells and therefore alleviates the off-target events associated with chemotherapy. Contrastingly, they showed amplified sensitivity and triggered release of chemotherapeutic payload when internalized into the tumor microenvironment causing maximum cytotoxic responses and the induction of cancer cell necrosis. This review focuses on the physical stimuli-responsive drug delivery systems and chemical stimuli-responsive drug delivery systems for triggered cancer chemotherapy through active and/or passive targeting. Moreover, the review also provided a brief insight into the molecular dynamic simulations associated with stimuli-based tumor targeting.

Keywords: chemotherapy; prodrugs; stimuli-responsive drug delivery systems; tumor.

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Conflict of interest statement

The authors declare that there are no conflicts of interest.

Figures

Figure 1
Figure 1
Renowned Stimuli-Responsive Drug Delivery Systems for Cancer Chemotherapy.
Figure 2
Figure 2
Cancer Cell-Specific Cytotoxicity by Active and Passive Targeting of Chemotherapeutic Agent(s).
Figure 3
Figure 3
Molecular Transitions in Stimuli-Responsive Lipid-based Drug Delivery Systems used for Cancer Chemotherapy (“L.T” represents Lipophilic Tail, “H.H” represents Hydrophilic Head, “DPPC” represents 1,2-dipalmitoyl-sn-glycero-3-phosphocholine, “DSPC” represents 1,2-distearoyl-sn-glycero-3-phosphocholine, “HSPC” represents hydrogenated soy phosphatidylcholine, “MSPC” represents 1-myristoyl-2-stearoyl-sn-glycero-3-phosphocholine, “HOPC” represents 1-hexadecenyl-2-oleoyl-sn-glycero-3-phosphocholine, “DPPG” represents 1,2-dipalmitoyl-sn-glycero-3-phosphatidylglycerol, “DSPG” represents 1,2-distearoyl-sn-glycero-3-phosphatidylglycerol, “DMPG” represents 1,2-dimyristoyl-sn-glycero-3-phosphatidylglycerol, “DSPE-PEG2000” represents 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[amino (polyethylene glycol)-2000], “DMPE” represents 1,2-dimyristoyl-sn-glycero-3-phosphoethanolamine, “DOPE” represents 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine).
Figure 4
Figure 4
General Concept Regarding Stimuli-Responsive Lipid-Based Drug Delivery Systems Used for Cancer Chemotherapy.
Figure 5
Figure 5
Stimuli-Responsive Prodrugs for Cancer Chemotherapy. “mPEG5000-b-(HPMAmLac2-r-AzEMA)-DOX-PropGA3” represents poly(ethylene glycol)5000-b-poly[N-(2-hydroxypropyl) methacrylamide-lactate]2-2-azidoethyl methacrylate-doxorubicin propargyl glucuronide A3 prodrug, “mPEG-b-PLA-g-DOX” represents mPolyethyleneglycol-b-norbornene functionalized polylactic acid-grafted doxorubicin.
Figure 6
Figure 6
Stimuli-Responsive Carrier/Polymer-based Nanoparticle for Cancer Chemotherapy.
Figure 7
Figure 7
Molecular Dynamic Simulation of (A) siRNA-based dendrimers, (B) interaction between 4 20-mer chitosan (CS) and 9 exendin-4 molecules in the absence/presence of Fe3+ at pH 6.5, (C) docking scheme 2D model representing the affinity and (D) selectivity of nanoparticles towards healthy and cancerous cells (adopted with Copyright permission).

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