Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C0038358 (gastric ulcer)
 5,179 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Background: The gastroretentive drug delivery system is an effective administration route, which can improve the bioavailability of the drug and the therapeutic effect by prolonging the release time of the drug and controlling the release rate in the stomach. Methods: Inspired by the excellent adhesion properties of mussel protein, we prepared novel catechol-grafted chitosan alginate/barium sulfate microcapsules (Cat-CA/BS MCs) with mucoadhesive properties and computed tomography (CT) imaging function for gastric drug delivery. First, barium sulfate nanoclusters used as CT contrast agent were synthesized in situ in the Cat-CA/BS MCs through a one-step electronic spinning method. Next, catechol-grafted chitosan as the mucoadhesive moiety was coated on the surface of Cat-CA/BS MCs by polyelectrolyte molecule self-assembly. Results: The prepared Cat-CA/BS MCs could effectively retained in the stomach for 48 hours and successively released ranitidine hydrochloride, which could be used for the treatment of gastric ulcer. Cat-CA/BS MCs exhibited superior CT contrast imaging properties for real-time tracking in vivo after oral administration. Conclusion: These findings demonstrate that Cat-CA/BS MCs serving as multifunctional oral drug carriers possess huge potential in gastroretentive drug delivery and non-invasive visualization.
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PMID:Construction of catechol-grafted chitosan alginate/barium sulfate microcapsules for computed tomography real-time imaging and gastroretentive drug delivery. 3144 54

Aphthous stomatitis is induced by chemotherapy and radiotherapy. It has been reported that 100% of patients administered high-dose chemotherapy and 80% of patients receiving radiotherapy develop stomatitis. The most serious cases are accompanied by pain and bleeding of the ulcers, which cause significant suffering and reduce patients' quality of life. Rebamipide (RB) was developed in Japan as a treatment for gastric ulcer. In this study, we prepared and evaluated a mouthwash for stomatitis taking into consideration the solubilization of RB. RB nanoparticles were prepared by the wet-milling technique using various forms of hydroxypropyl cellulose (HPC-L, -SL, and -SSL) and sodium lauryl sulfate (SLS). RB nanoparticles sized between 126.6 and 286.8 nm were obtained under various conditions. From the results of zeta potential measurement and evaluation of their dispersibility, it appeared that the prepared nanosuspensions were stable. Furthermore, adhesion of the nanoparticles to the mucous membrane in the oral cavity was evaluated using quartz crystal microbalance with dissipation monitoring (QCM-D) technology. From the changes in the thickness of the gold sensor observed in QCM-D measurement, it was suggested that HPC-SSL molecules interact with mucin mounted on the gold sensor. It appears feasible to utilize RB nanoparticles dispersed in HPC-SSL solution in mouthwash to prevent stomatitis.
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PMID:[Development of Hospital Formulations Based on Medical Need]. 3158 12


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