Abstract:
:Colon is an ideal absorptive site for oral protein and peptide drug (insulin), and yet it poses multiple barriers against the drug absorption, such as the barriers against the drug diffusion from colon lumen toward the absorptive mucosa and permeation across colon epithelium. In this study, modified nanoparticles (Tat-CS-NPs) with cell-penetrating peptide (Tat) and amphipathic chitosan derivative (a-CS) were used as carriers to improve colonic absorption of the drug. With a-CS as emulsifier and poly(lactic-co-glycolic acid) as matrix material, Tat-CS-NPs were prepared and evaluated in vitro/vivo. Using Caco-2 cell monolayers to imitate the colonic epithelial cells, it was found that the cellular uptake amount and transcellular transportation performance of Tat-CS-NPs were much enhanced compared with those of CS-NPs and PVA-NPs. The efficacy evaluation on diabetic rat models demonstrated that the hypoglycemic effect of Tat-CS-NPs loaded with insulin was 6.89 times higher than that of PVA-NPs, and 1.79 times higher than that of CS-NPs. By gavage of [(99m)Tc] isotope labeled Tat-CS-NPs in mini-pigs and single-photon emission computed tomography (SPECT) on pigs' gastrointestinal tract, it was further proved that the nanoparticles could reach colon and produce pharmacological effect. In conclusion, Tat-CS-NPs as vehicles for colon-specific drug delivery may be an efficient approach to improve oral bioavailability of protein and peptide drugs.
journal_name
Drug Delivjournal_title
Drug deliveryauthors
Guo F,Zhang M,Gao Y,Zhu S,Chen S,Liu W,Zhong H,Liu Jdoi
10.3109/10717544.2015.1048489subject
Has Abstractpub_date
2016-07-01 00:00:00pages
2003-14issue
6eissn
1071-7544issn
1521-0464journal_volume
23pub_type
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