ARA-290: A Molecular Probe for Innate Repair Receptor Signaling

Reviewed for accuracy by the Gorilla Research Labs research team · 2026-07-04

PEPTIDE RESEARCH REFERENCE ARA-290: A Molecular Probe for Innate Repair Receptor Signaling ARA-290 is a synthetic peptide utilized in laboratory research as a selective ligand for the innate repair receptor (IRR), a heteromeric complex involved in cellular signaling pathways.

Overview & Classification

ARA-290, also identified in chemical literature as cibinetide, is a synthetic eleven-amino-acid peptide. It is structurally derived from the helix B domain of erythropoietin (EPO). Unlike the parent protein, ARA-290 is engineered to lack hematopoietic activity, making it a distinct tool for investigating non-erythropoietic signaling pathways in cellular models. As a peptide, its molecular structure is defined by its specific sequence of amino acids. For precise data regarding its molecular weight, chemical formula, and structural configuration, researchers should refer to the batch-specific Certificate of Analysis (COA) or public chemical databases such as PubChem. • Class: Synthetic peptide • Ligand Type: Innate Repair Receptor (IRR) agonist • Molecular Characteristics: Non-hematopoietic derivative

Molecular Target & Mechanism

The primary mechanism of ARA-290 involves its interaction with the innate repair receptor (IRR). This receptor is a heteromeric complex composed of the erythropoietin receptor (EPOR) and the common beta receptor (βcR). In laboratory models, ARA-290 has been reported to bind selectively to this complex, distinct from the binding affinity associated with traditional erythropoietic signaling. Upon binding to the IRR, the peptide is hypothesized to influence intracellular signaling cascades, such as the activation of the JAK2/STAT5 pathway or the modulation of NF-κB signaling. These interactions are studied in vitro to observe how receptor activation modulates cellular responses to environmental stressors or inflammatory signaling markers within a controlled laboratory environment.

Why Researchers Use It

In laboratory research, ARA-290 serves as a specialized tool for probing the function of the IRR. Because it does not induce the production of red blood cells, it allows investigators to isolate and examine the IRR-mediated pathways without the confounding variables associated with systemic erythropoiesis. Researchers utilize this compound to characterize the role of the IRR in various cell lines, particularly those involved in neuronal, glial, and endothelial research. By employing ARA-290, scientists can manipulate the activation state of the IRR to observe changes in cellular gene expression, cytokine release, or intracellular protein phosphorylation patterns in a strictly controlled experimental setting.

Research Context

Scientific inquiry involving ARA-290 generally focuses on the fundamental biology of cell-signaling receptors. Laboratory studies have investigated the presence and density of the IRR across different tissue types and how the administration of a selective ligand alters the signaling profile of these cells. The peptide is frequently employed in research models investigating how signaling via the IRR influences cellular homeostasis and the modulation of inflammatory mediators. By observing these interactions in vitro, researchers aim to map the downstream signaling consequences of IRR activation, contributing to a broader understanding of how heteromeric receptor complexes contribute to cellular signal transduction.

Handling, Stability & Storage for Laboratory Use

For laboratory applications, ARA-290 should be handled in accordance with standard biosafety protocols. The peptide is typically supplied as a lyophilized powder. To maintain structural integrity, it is recommended to store the lyophilized material at -20°C or -80°C in a desiccated environment. When preparing stock solutions for in-vitro assays, the peptide should be reconstituted in an appropriate solvent, such as deionized water or a buffered aqueous solution, depending on the specific experimental requirements. Once in solution, the peptide should be aliquoted and stored at -80°C to minimize freeze-thaw cycles. Researchers should avoid exposure to extreme pH or high temperatures, which may lead to degradation or aggregation of the peptide chain.

Purity & Analytical Verification

The utility of ARA-290 in research is dependent upon its chemical purity and structural accuracy. Analytical verification is typically conducted using High-Performance Liquid Chromatography (HPLC) to ensure the absence of truncated sequences or contaminants, and Mass Spectrometry (MS) to confirm the molecular mass. Researchers must verify the purity levels of their specific supply by reviewing the provided Certificate of Analysis (COA). High-purity standards are essential to ensure that observed cellular effects are attributable to the interaction between ARA-290 and the IRR, rather than the presence of synthesis byproducts or impurities.

How it Relates to Other Compounds in its Research Class

ARA-290 is part of a broader class of research peptides designed to target the innate repair receptor. It is often compared in literature to other EPO-derived peptides or small-molecule agonists that interact with the EPOR/βcR complex. The primary distinction between ARA-290 and other ligands in this class is its high selectivity for the IRR and its lack of interaction with the homodimeric EPO receptor, which is responsible for erythropoiesis. By comparing ARA-290 with other IRR ligands, researchers can differentiate between the signaling pathways triggered by different receptor configurations. This comparative approach is fundamental for isolating the specific contributions of the βcR component to the overall signaling complex.

Frequently Asked Research Questions

What is the primary difference between ARA-290 and erythropoietin? While both interact with components of the EPO receptor, ARA-290 is a synthetic derivative specifically engineered to bind to the heteromeric IRR complex without activating the homodimeric EPOR, thereby avoiding the hematopoietic effects associated with EPO. How is ARA-290 selectivity verified in vitro? Selectivity is generally assessed through competitive binding assays and by measuring the absence of downstream hematopoietic markers in cell lines that express the homodimeric EPOR versus those that express the heteromeric IRR. Can ARA-290 be used in all cell culture media? Compatibility depends on the specific additives in the culture media. Researchers should ensure that the media does not contain inhibitors that might interfere with peptide binding or induce rapid degradation of the peptide sequence. What is the role of the common beta receptor (βcR) in ARA-290 research? The βcR is a critical component of the IRR. Research into ARA-290 often involves studying the βcR to understand how its association with the EPOR changes the signaling outcomes compared to signaling through the EPOR alone. Research use only — no structure/function or human-use claims are made. All information provided is for educational purposes regarding laboratory research and chemical characterization.