1. Y12 nitration of human calcitonin (hCT): A promising strategy to produce non-aggregation bioactive hCT.
- Author
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Ye, Huixian, Li, Hailing, and Gao, Zhonghong
- Subjects
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NITRATION , *CALCITONIN , *DRUG design , *PEPTIDE hormones - Abstract
Irreversible aggregation can extremely limit the bioavailability and therapeutic activity of peptide-based drugs. There is therefore an urgent demand of effective strategy to control peptide aggregation. Recently, we found that tyrosine nitration at certain sites of peptide can effectively inhibit its aggregation. This minor modification may be an ideal strategy to the rational design of peptide-based drugs with low aggregation propensity yet without loss of bioactivity. Human calcitonin (hCT) is such a peptide hormone known for its hypocalcaemic effect but has limited pharmaceutical potential due to a high tendency to aggregate. In this study, by using multiple techniques including Fluorescence, TEM, Nu-PAGE and CD, we demonstrated that Y12 nitration of hCT would significantly inhibit its self-assembles, and we also found that this modification would not only reduce the cytotoxicity induced by peptide aggregation, but also had little effect on its potency. This finding may provide a novel strategy for clinically application of hCT instead of sCT. Tyr12 nitration of hCT could be a useful strategy for inhibiting its aggregation but not reducing the hypocalcaemic activity. Image 1 • Tyrosine nitration could effectively inhibit the formation of hCT fibril. • The low aggregation propensity of hCT (3 N) makes it less cytotoxicity than hCT. • hCT (3 N) could still maintain the approximately equally potency compared with hCT. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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