ARA 290, also known as cibinetide or pyroglutamate helix B surface peptide (pHBSP), is a synthetic linear 11-amino-acid peptide modeled on the three-dimensional surface of erythropoietin helix B. It was engineered to retain tissue-protective signaling while minimizing interaction with the classical erythropoietin receptor homodimer responsible for erythropoiesis.

The peptide is widely investigated as a selective ligand for the innate repair receptor, a heteromeric receptor complex associated with cellular protection and repair responses during injury or inflammation. Research has explored inflammatory signaling, small-fiber and peripheral nerve biology, nociceptive pathways, tissue injury, and repair-associated cellular responses.

Research Mechanism and Scientific Rationale

Published research describes ARA 290 as activating the innate repair receptor formed by the erythropoietin receptor and beta-common receptor subunits. This receptor is reported to be induced in stressed or injured tissues and to initiate anti-inflammatory, cytoprotective, and repair-associated signaling without the hematopoietic activity of conventional erythropoietin signaling.

Additional studies have examined downstream modulation of inflammatory mediators, neuronal hypersensitivity pathways, and TRPV1 channel activity. The precise response varies by tissue, disease model, and experimental conditions, making the peptide particularly useful for receptor-dependence studies.

Importance in Biological and Chemical Research

ARA 290 is a rationally designed peptide tool that separates tissue-protective signaling from erythropoietic signaling. This makes it valuable for studying receptor selectivity, injury-induced cellular responses, neuroimmune communication, and how short-lived ligands can trigger sustained downstream effects.

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• Key Research Applications

  Innate Repair Receptor Research

  Used to investigate receptor activation, beta-common-receptor dependence, and downstream protective signaling.

  Inflammation and Tissue-Stress Models

  Suitable for research on cytokine regulation, cellular stress responses, injury-associated inflammation, and recovery pathways.

  Peripheral Nerve and Small-Fiber Biology

  Applied in experimental studies of neuronal integrity, neuroimmune signaling, hypersensitivity, and nerve-repair markers.

  Nociception and TRPV1 Pathway Research

  Supports mechanistic studies of sensory-neuron signaling, TRPV1 channel modulation, and inflammatory pain pathways.

  Peptide Pharmacology and Bioanalysis

  Useful for receptor-selectivity experiments, stability studies, LC-MS method development, and pharmacokinetic/pharmacodynamic research.

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Why Choose Our ARA 290 (Cibinetide)?

· Defined 11-amino-acid sequence with the required N-terminal pyroglutamate.

· Sequence identity supported by mass spectrometry and chromatographic analysis.

· Research-grade manufacturing focused on reproducibility and controlled impurities.

· Lot-specific analytical documents available according to ordered grade and testing package.

· Flexible supply for discovery research, assay development, and preclinical programs.