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Novel Complexation Hydrogels For Oral Peptide Delivery: In Vitro Evaluation Of Their Cytocompatibility And Insulin-transport Enhancing Effects Using Caco-2 Cell Monolayers.

H. Ichikawa, N. Peppas
Published 2003 · Medicine, Materials Science

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Poly[methacrylic acid-grafted-poly(ethylene glycol)] [P(MAA-g-EG)] is a complexation hydrogel molecularly designed for oral peptide delivery. In this work, the cytotoxicity and insulin-transport enhancing effect of P(MAA-g-EG) microparticles on intestinal epithelial cells were evaluated using Caco-2 cell monolayers. A series of P(MAA-g-EG) microparticles with different polymer compositions were prepared by a photo-initiated free radical solution polymerization and subsequent pulverization. The hydrogel microparticles were preswollen in either Ca2+-containing (CM+) or Ca2+-free medium (CM-; pH 7.4) and applied to the apical side of the Caco-2 monolayers. No significant cytotoxic effects, as determined by a calorimetric assay with P(MAA-g-EG) microparticles preswollen in the CM+, were observed at doses ranging from 3 to 31 mg/cm2 of cell monolayer. Transepithelial electrical resistance (TEER) measurements showed that the P(MAA-g-EG) microparticles induced a Ca2+ concentration-dependent lowering in TEER values. The reduction effect in CM- media was greater than that in CM+ media (17 +/- 2% reduction in CM+ and 45 +/- 3% reduction in CM-, respectively). Insulin transport in the presence of the preswollen P(MAA-g-EG) microparticles was also strongly depended on the Ca2+ concentration in the medium. The respective estimated permeability for insulin alone and the insulin with hydrogels in CM+ were 0.77 and 1.16 x 10(-8) cm/s, whereas those in CM- were 1.18 and 24.78 x 10(-8) cm/s. The results demonstrate that the P(MAA-g-EG) hydrogel microparticles could be used as a cytocompatible carrier possessing the transport-enhancing effect of insulin on the intestinal epithelial cells.
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