[Promoting mechanism of enhancers and transport pathway of large hydrophilic molecular across nasal epithelium studied by ESR and CLSM technologies].
The aim of this study is to investigate absorption-promoting mechanism of enhancers and the transport pathway of large hydrophilous molecular across rat nasal epithelium by electron spin resonance (ESR) and confocal laser scanning microscopy (CLSM) technologies. In the experiment, recombinant hirudin-2 (rHV2) was chosen as a large hydrophilic molecular model drug. After nasal administration in rats the bioavailability of rHV2 with or without various enhancers was compared. The effects of enhancers on membrane lipid fluidity and protein conformation were measured with 5-deoxyl-stearic acid (5-DSA), 16-deoxyl-stearic acid (16-DSA) and 3-maleidoproxyl (MSL) labeling ESR. The effects of enhancers on cytoskeletal F-actin of rat nasal epithelium and FITC-rHV2 transport pathway across rat nasal epithelium were performed by CLSM combined with fluorescence labeling. 0.5% Chitosan (CS), 5% hydroxyl-propyl-beta-cyclodextrin ( HP-beta-CD) and 1% ammonium glycyrrhizinate (AMGZ) were all able to significantly increase the nasal absorption of rHV2. CS could result in the paracellular pathway transport of FITC-rHV2 which seemed related to a transient effect on tight junctions. HP-beta-CD could cause paracellular and transcellular route transport of FITC-rHV2 by influencing upon membrane protein as well as lipid fluidity. AMGZ seemed to enhance the transcellular route transport of FITC-rHV2, and could exert some influence on membrane protein but not on lipid fluidity. So how it brought out this result needs further research. Present experiment may become a useful reference for promoting mechanism of enhancers and the transport pathway of large hydrophilic molecular across nasal epithelium research.
Zhang
Yu-jie
YJ
School of Chinese Material Medica, Beijing University of Chinese Medicine, Beijing 100102, China. zhyj227@126.com
Zhang
Qiang
Q
Yang
Jie
J
Sun
Ming-jie
MJ
Wang
Xiao-liang
XL
Chen
Ming-xia
MX
Wang
Qi
Q
Jiang
Hao
H
D000073738:2-Hydroxypropyl-beta-cyclodextrin; D000042:Absorption; D000281:Administration, Intranasal; D000818:Animals; D019540:Area Under Curve; D001682:Biological Availability; D001692:Biological Transport / Q000187:drug effects; D048271:Chitosan / Q000494:pharmacology*; D004578:Electron Spin Resonance Spectroscopy; D019695:Glycyrrhizic Acid / Q000494:pharmacology; D006629:Hirudins / Q000097:blood / Q000493:pharmacokinetics*; D008297:Male; D018613:Microscopy, Confocal; D009296:Nasal Cavity; D009297:Nasal Mucosa / Q000378:metabolism*; D011817:Rabbits; D051381:Rats; D017207:Rats, Sprague-Dawley; D011994:Recombinant Proteins / Q000097:blood / Q000493:pharmacokinetics*; D047392:beta-Cyclodextrins / Q000494:pharmacology
D006629:Hirudins; D011994:Recombinant Proteins; D047392:beta-Cyclodextrins; C072299:hirudin HV2; D000073738:2-Hydroxypropyl-beta-cyclodextrin; D019695:Glycyrrhizic Acid; D048271:Chitosan