Orally Active Peptides: Is There a Magic Bullet?

Angewandte Chemie
Andreas F B RäderHorst Kessler

Abstract

For decades, the development of peptides as potential drugs was aimed solely at peptides with the highest affinity, receptor selectivity, or stability against enzymatic degradation. However, optimization of their oral availability is highly desirable to establish orally active peptides as potential drug candidates for everyday use. A twofold optimization process is necessary to produce orally active peptides: 1) optimization of the affinity and selectivity and 2) optimization of the oral availability. These two steps must be performed sequentially for the rational design of orally active peptides. Nevertheless, additional knowledge is required to understand which structural changes increase oral availability, followed by incorporation of these elements into a peptide without changing its other biological properties. Considerable efforts have been made to understand the influence of these modifications on oral availability. One approach is to improve the oral availability of a peptide that has been previously optimized for biological activity, as described in (1) above. The second approach is to first identify an intestinally permeable, metabolically stable peptide scaffold and then introduce the functional groups necessary for ...Continue Reading

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