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Nasal absorption enhancement of insulin by sodium deoxycholate in combination with cyclodextrins.

Abstract：

AIM:To evaluate the nasal absorption enhancement of insulin by sodium deoxycholate (SDC) in combination with cyclodextrins (CD). METHODS:The concentration of glucose in blood was measured. Scanning electron microscopy technique was used to investigate the effect of enhancers on the nasal mucocilia. The effect of SDC in combination with CD on the leucine aminopeptidase (LAP) activity in the nasal mucosa was observed. RESULTS:Intranasal administration of insulin (4 U/kg) along with 0.75 % SDC/beta-CD at a molar ratio of 1 : 2 slowly decreased the blood glucose levels of rats. The minimal blood glucose level was (72.6 +/- 2.1) % of baseline, and which was lasted for 3 h. Though the decrement of blood glucose in 0.75 % SDC/beta-CD (1 : 2) treated group was less than that in 0.75 % SDC treated group, there was no significant difference between the two groups in AOC0- t values (P > 0.05). SDC (0.01 %) solution did not have any absorption prompting effect. Scanning electron microscopy investigation showed that 0.75 % SDC/beta-CD (1 : 2) solution had no marked damage on rat nasal mucosa 4 h after nasal administration, while 0.01 % SDC still had some damage on the rat nasal mucosa. The inhibitory effect of SDC on the LAP activity was decreased from 89.2 % to 69.2 %, 71.5 %, 60.4 %, and 61.3 % in 0.75 % SDC/beta-CD (1 : 1), 0.75 % SDC/beta-CD (1 : 2), 0.75 % SDC/DM-beta-CD (1 : 1), and 0.75 % SDC/DM-beta-CD (1 : 2) treated group, respectively. CONCLUSION:Combining beta-CD with SDC lowered the serious nasal ciliotoxicity of SDC and had a marked absorption promoting effect, which was not due to low concentration of SDC but was related with the inhibition of LAP activity.

journal_name

Acta Pharmacol Sin

journal_title

Acta pharmacologica Sinica

authors

Zhang Y,Jiang XG,Yao J

subject

Has Abstract

pub_date

2001-11-01 00:00:00

pages

1051-6

issue

11

eissn

1671-4083

issn

1745-7254

journal_volume

22

pub_type

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