Nanostructured lipid carriers with exceptional gastrointestinal stability and inhibition of P-gp efflux for improved oral delivery of tilmicosin

Qian Zhang; Haifeng Yang; Benazir Sahito; Xinyu Li; Lin Peng; Xiuge Gao; Hui Ji; Liping Wang; Shanxiang Jiang; Dawei Guo

doi:10.1016/j.colsurfb.2019.110649

Nanostructured lipid carriers with exceptional gastrointestinal stability and inhibition of P-gp efflux for improved oral delivery of tilmicosin

Colloids Surf B Biointerfaces. 2020 Mar:187:110649. doi: 10.1016/j.colsurfb.2019.110649. Epub 2019 Nov 17.

Authors

Qian Zhang¹, Haifeng Yang², Benazir Sahito¹, Xinyu Li¹, Lin Peng¹, Xiuge Gao¹, Hui Ji¹, Liping Wang¹, Shanxiang Jiang¹, Dawei Guo³

Affiliations

¹ Laboratory of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, PR China.
² Laboratory of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, PR China; Department of Animal Pharmacy, Jiangsu Agri-Animal Husbandry Vocational College, Taizhou 225300, PR China.
³ Laboratory of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, PR China. Electronic address: gdawei0123@njau.edu.cn.

PMID: 31767412
DOI: 10.1016/j.colsurfb.2019.110649

Abstract

Tilmicosin (TMS) is widely applied to treat porcine bacterial respiratory diseases in veterinary medicine. However, oral administration of TMS is greatly limited due to its physicochemical properties, such as poor water solubility, gastric acid sensitivity and bitterness. Therefore, nanostructured lipid carriers (NLCs) were developed as an oral delivery system for TMS by the high shear method combined with ultrasonic techniques in this study. The results showed that TMS-NLCs were approximately spherical with a hydrodynamic diameter of 283.03 nm and a zeta potential of -30.04 mV. TMS was almost entirely encapsulated in the NLCs by interacting with the lipid matrix, as characterized by differential scanning calorimetry and fourier transform infrared spectroscopy. Thus, TMS-NLCs had an excellent encapsulation efficiency and loading capacity with values of 93.46% and 9.23%, respectively. TMS-NLCs maintained good stability not only during storage at 4 ℃, 25 ℃ and 40 ℃ for 90 days but also in stimulated gastrointestinal (GI) fluids at 37 ℃ for 7 days. Therefore, TMS-NLCs displayed low and sustained release in vitro without an initial burst release in stimulated GI fluids. Furthermore, TMS-NLCs showed higher oral bioavailability in piglets compared to the API suspension. Subsequently, Caco-2 cell monolayers were utilized to analyze the mechanism of NLC-enhanced oral adsorption of TMS. The data revealed that NLCs not only increased cellular uptake of TMS but also inhibited the efflux of P-gp in Caco-2 cells. Additionally, TMS-NLCs mainly entered Caco-2 cells via the caveolae/lipid raft-mediated endocytosis pathway. Moreover, nanoparticles were transported across Caco-2 cell monolayers in the intact form to the basolateral side, as identified by transmission electron microscopy, indicating that TMS-NLCs escape lysosome degradation. Taken together, these results indicate that NLCs are a potential delivery carrier for improving the solubility, permeability and oral bioavailability of TMS.

Keywords: Caco-2 cells; Nanostructured lipid carriers; Oral bioavailability; Permeability; Piglets; Solubility; Tilmicosin.

MeSH terms

ATP Binding Cassette Transporter, Subfamily B, Member 1 / metabolism*
Animals
Caco-2 Cells
Cell Membrane Permeability / drug effects
Drug Carriers / chemistry*
Drug Delivery Systems*
Drug Liberation
Gastrointestinal Tract / drug effects*
Humans
Lipids / chemistry*
Nanostructures / chemistry*
Nanostructures / ultrastructure
Protein Transport / drug effects
Swine
Tylosin / analogs & derivatives*
Tylosin / pharmacokinetics
Tylosin / pharmacology

Substances

ATP Binding Cassette Transporter, Subfamily B, Member 1
Drug Carriers
Lipids
tilmicosin
Tylosin