ISSN:
1432-0428
Schlagwort(e):
Keywords Insulin analogues
;
albumin binding
;
prolonged action
;
basal insulin
;
fatty acids
;
tetradecanoic acid
;
myristic acid
;
lysineB29
;
acylation
;
receptor affinity.
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Medizin
Notizen:
Summary We have synthesized insulins acylated by fatty acids in the ɛ-amino group of LysB29. Soluble preparations can be made in the usual concentration of 600 nmol/ml (100 IU/ml) at neutral pH. The time for 50 % disappearance after subcutaneous injection of the corresponding TyrA14(125I)-labelled insulins in pigs correlated with the affinity for binding to albumin (r = 0.97), suggesting that the mechanism of prolonged disappearance is binding to albumin in subcutis. Most protracted was LysB29-tetradecanoyl des-(B30) insulin. The time for 50 % disappearance was 14.3 ± 2.2 h, significantly longer than that of Neutral Protamine Hagedorn (NPH) insulin, 10.5 ± 4.3 h (p 〈 0.001), and with less inter-pig variation (p 〈 0.001). Intravenous bolus injections of LysB29-tetradecanoyl des-(B30) human insulin showed a protracted blood glucose lowering effect compared to that of human insulin. The relative affinity of LysB29-tetradecanoyl des-(B30) insulin to the insulin receptor is 46 %. In a 24-h glucose clamp study in pigs the total glucose consumptions for LysB29-tetradecanoyl des-(B30) insulin and NPH were not significantly different (p = 0.88), whereas the times when 50 % of the total glucose had been infused were significantly different, 7.9 ± 1.0 h and 6.2 ± 1.3 h, respectively (p 〈 0.04). The glucose disposal curve caused by LysB29-tetradecanoyl des-(B30) insulin was more steady than that caused by NPH, without the pronounced peak at 3 h. Unlike the crystalline insulins, the soluble LysB29-tetradecanoyl des-(B30) insulin does not elicit invasion of macrophages at the site of injection. Thus, LysB29-tetradecanoyl des-(B30) insulin might be suitable for providing basal insulin in the treatment of diabetes mellitus. [Diabetologia (1996) 39: 281–288]
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00418343
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