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125I used for labelling of proteins in an absorption model changes the absorption rate of insulin aspart.

Abstract：

UNLABELLED:The aim of this study is to validate the ability of the disappearance model to predict absorption rates of insulin aspart in pigs. The disappearance model is used as a screening tool to estimate absorption rates after subcutaneous injections in humans or pigs especially of insulin and insulin analogues. The disappearance model measures remaining radioactivity at the injection site and therefore radioactive labelling of the insulin analogue is necessary. The labelling is done with 125I. One of the assumptions for the disappearance model to be reliable is that absorption rates of the labelled and non-labelled molecules are comparable. In this study, we compared disappearance data with absorption calculated from plasma samples of insulin aspart. The calculated absorption is based on non-labelled insulin aspart. The absorption rate from the disappearance data was statistical significant (p = 0.0028) different from the absorption rate based on plasma samples. A control study was carried out where 125I labelled insulin aspart was compared to 127I (the natural non-radioactive isotope) insulin aspart. In this study, absorption rate from the disappearance data and absorption rate based on plasma samples were similar (p = 0.63). CONCLUSION:Iodination of insulin aspart changes the subcutaneous absorption rate.

journal_name

Int J Pharm

journal_title

International journal of pharmaceutics

authors

Sohoel A,Plum A,Frokjaer S,Thygesen P

doi

10.1016/j.ijpharm.2006.09.004

subject

Has Abstract

pub_date

2007-02-07 00:00:00

pages

114-20

issue

1-2

eissn

0378-5173

issn

1873-3476

pii

S0378-5173(06)00738-1

journal_volume

330

pub_type

杂志文章

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