Advances in peptidic and peptidomimetic-based approaches to inhibit STAT signaling in human diseases.

Abstract:

:STATs promote fundamental cellular processes, marking them as convergence points of many oncogenic and inflammatory pathways. Therefore, aberrant activation of STAT signaling is implicated in a plethora of human diseases, like cancer, inflammation and auto-immunity. Identification of STAT-specific inhibitors is the topic of great practical importance, and various inhibitory strategies are being pursued. An interesting approach includes peptides and peptide-like biopolymers, because they allow the manipulation of STAT signaling without the transfer of genetic material. Phosphopeptides and peptidomimetics directly target STATs by inhibiting dimerization. Despite that a large number of efficient peptide- based STAT3-specific inhibitors have been reported to date, none of them was able to meet the pharmacological requirements to serve as a potent anti-cancer drug. The existing limitations, like metabolic instability and poor cell permeability during in vivo tests, excluded these macromolecules from further clinical development. To overcome these liabilities, in the last five years many advances have been made to develop next generation STAT-specific inhibitors. Here we discuss the pitfalls of current STAT inhibitory strategies and review the progress on the development of peptide-like prodrugs directly targeting STATs. Novel strategies involve screening of high-complexity libraries of random peptides, as specific STAT3 or STAT5 DNA-binding inhibitors, to construct cell permeable peptide aptamers and aptides for cancer therapy. Another new direction is synthesis of negative dominant α-helical mimetics of the STAT3 N-domain, preventing oligomerization on DNA. Moreover, construction of phosphopeptide conjugates with molecules mediating cellular uptake offers new therapeutic possibilities in treatment of cancer, asthma and allergy.

journal_name

Curr Protein Pept Sci

authors

Szelag M,Wesoly J,Bluyssen HA

doi

10.2174/1389203716666151102103706

subject

Has Abstract

pub_date

2016-01-01 00:00:00

pages

135-46

issue

2

eissn

1389-2037

issn

1875-5550

pii

CPPS-EPUB-71505

journal_volume

17

pub_type

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