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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1985 Nov;82(21):7419–7423. doi: 10.1073/pnas.82.21.7419

Nasal absorption of insulin: enhancement by hydrophobic bile salts.

G S Gordon, A C Moses, R D Silver, J S Flier, M C Carey
PMCID: PMC391356  PMID: 3903753

Abstract

We demonstrate that therapeutically useful amounts of insulin are absorbed by the nasal mucosa of human beings when administered as a nasal spray with the common bile salts. By employing a series of bile salts with subtle differences in the number, position, and orientation of their nuclear hydroxyl functions and alterations in side chain conjugation, we show that adjuvant potency for nasal insulin absorption correlates positively with increasing hydrophobicity of the bile salts' steroid nucleus. As inferred from studies employing various concentrations of unconjugated deoxycholate and a constant dose of insulin, insulin absorption begins at the aqueous critical micellar concentration of the bile salt and becomes maximal when micelle formation is well established. These and other data are consistent with the complementary hypotheses that bile salts act as absorption adjuvants by producing high juxtamembrane concentrations of insulin monomers via solubilization in mixed bile salt micelles and forming reverse micelles within nasal membranes, through which insulin monomers can diffuse through polar channels from the nares into the blood stream.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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