4.7 Article

Cyclic mimetics of kinase-inhibitory region of Suppressors of Cytokine Signaling 1: Progress toward novel anti-inflammatory therapeutics

Journal

EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
Volume 221, Issue -, Pages -

Publisher

ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ejmech.2021.113547

Keywords

Mimetic peptides; Cytokine signaling; JAK/STAT; SOCS1; Oxidative stress; Inflammation

Funding

  1. POR CAMPANIA FESR 2014/2020 Combattere la resistenza tumorale: piattaforma integrata multidisciplinare per un approccio tecnologico innovativo alle oncoterapie-Campania Oncoterapie [B61G18000470007]
  2. Spanish Ministry of Science, Innovation and Universities (MICINN/FEDER) [RTI2018098788-B-I00]
  3. Ministry of Health (FIS) [DTS17/00203, DTS19/00093]

Ask authors/readers for more resources

This study investigated the cellular effects of a cyclized JAK2 inhibitor, PS5, mimicking the SOCS1 protein. Through structural modifications, high affinity candidates towards the JAK2 catalytic domain were produced, which demonstrated inhibitory effects on JAK-mediated signaling pathways. The research provides insights into the development of low-molecular-weight proteomimetics with improved cellular effects.
Herein we investigated the structural and cellular effects ensuing from the cyclization of a potent inhibitor of JAK2 as mimetic of SOCS1 protein, named PS5. The introduction of un-natural residues and a lactam internal bridge, within SOCS1-KIR motif, produced candidates that showed high affinity toward JAK2 catalytic domain. By combining CD, NMR and computational studies, we obtained valuable models of the interactions of two peptidomimetics of SOCS1 to deepen their functional behaviors. Notably, when assayed for their biological cell responses mimicking SOCS1 activity, the internal cyclic PS5 analogues demonstrated able to inhibit JAK-mediated tyrosine phosphorylation of STAT1 and to reduce cytokine-induced proinflammatory gene expression, oxidative stress generation and cell migration. The present study well inserts in the field of low-molecular-weight proteomimetics with improved longtime cellular effects and adds a new piece to the puzzled way for the conversion of bioactive peptides into drugs. (C) 2021 Elsevier Masson SAS. All rights reserved.

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