4.7 Article

Further Developments towards a Minimal Potent Derivative of Human Relaxin-2

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MDPI
DOI: 10.3390/ijms241612670

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human relaxin-2; RXFP1; 7BP; B7-33; B9-31; fibrosis; peptide synthesis

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H2 relaxin is a peptide hormone with vasodilatory and anti-fibrotic effects. Researchers have developed B7-33, a derived peptide from H2 relaxin, which showed equivalent potency and anti-fibrotic effects in fibroblasts. B7-33 also reversed organ fibrosis in pre-clinical animal studies.
Human relaxin-2 (H2 relaxin) is a peptide hormone with potent vasodilatory and anti-fibrotic effects, which is of interest for the treatment of heart failure and fibrosis. H2 relaxin binds to the Relaxin Family Peptide Receptor 1 (RXFP1). Native H2 relaxin is a two-chain, three-disulfide-bond-containing peptide, which is unstable in human serum and difficult to synthesize efficiently. In 2016, our group developed B7-33, a single-chain peptide derived from the B-chain of H2 relaxin. B7-33 demonstrated poor affinity and potency in HEK cells overexpressing RXFP1; however, it displayed equivalent potency to H2 relaxin in fibroblasts natively expressing RXFP1, where it also demonstrated the anti-fibrotic effects of the native hormone. B7-33 reversed organ fibrosis in numerous pre-clinical animal studies. Here, we detail our efforts towards a minimal H2 relaxin scaffold and attempts to improve scaffold activity through Aib substitution and hydrocarbon stapling to re-create the peptide helicity present in the native H2 relaxin.

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