pH/Thermo-Dual Responsive Tunable In Situ Cross-Linkable Depot Injectable Hydrogels Based on Poly(N-Isopropylacrylamide)/Carboxymethyl Chitosan with Potential of Controlled Localized and Systemic ... View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2019-04

AUTHORS

Samiullah Khan, Naveed Akhtar, Muhammad Usman Minhas, Syed Faisal Badshah

ABSTRACT

In the current study, cytocompatible in situ cross-linkable pH/thermo-dual responsive injectable hydrogels were prepared based on poly(N-isopropylacrylamide) and carboxymethyl chitosan, i.e., poly(CMCS-g-NIPAAm). The prepared formulations were aimed to be used as drug depot of 5-fluorouracil (5-FU) after subcutaneous administration in vivo. The phase transition from sol-gel state under physiologic temperature range was analyzed and confirmed by tube titling and optical transmittance measurements. The viscoelastic properties of gel formulations were confirmed by rheology determination via time sweep, temperature, and continuous ramp test. Oscillatory swelling cycles confirmed temperature effect and structural changes. pH and temperature sensitivity of dual responsive gels were analyzed at different pH and temperature programs. In vitro drug release profile displayed that developed formulations have the highest release in acidic pH at 25°C. The safety of blank gel formulations was evaluated against L929 cell lines via MTT assay and confirmed cytocompatibility with no detectable toxicity. In vitro cytotoxic potential of drug-loaded gels against HeLa and MCF-7 cancer cell lines confirmed that 5-FU has controlled cytotoxic potential in depot form in comparison to free 5-FU solution. The IC50 values for free 5-FU (21 ± 05 μg/ml and 18 ± 66 μg/ml) were found higher in comparison to the loaded form. The copolymer structure formation was confirmed by NMR and FTIR spectroscopic analysis. TG and DSC analysis proved the thermal stability and phase transition temperatures of pure and copolymer samples, while SEM analysis showed the porous nature of in situ formed hydrogels. It was concluded from the results that the developed formulations have pH/temperature sensitivity with potential of systemic and intratumoral controlled drug delivery properties. More... »

PAGES

119

Identifiers

URI

http://scigraph.springernature.com/pub.10.1208/s12249-019-1328-9

DOI

http://dx.doi.org/10.1208/s12249-019-1328-9

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1112292196

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30790143


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310 schema:name College of Pharmacy, University of Sargodha, Sargodha, Pakistan
311 Faculty of Pharmacy and Alternative Medicine, The Islamia University of Bahawalpur, 63100, Bahawalpur, Punjab, Pakistan
312 rdf:type schema:Organization
 




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