ARA-290 vs Cerluten

Non-hematopoietic EPO analogue; activates innate repair receptor (IRR/EPOR/CD131 complex) without erythropoietic effects; promotes tissue repair and nerve healing

ARA 290 (cibinetide) is a synthetic 11-amino-acid peptide derived from the helix B region of erythropoietin (EPO), engineered to activate the innate repair receptor (IRR) — a tissue-protective heteroreceptor complex comprising the EPO receptor and the β-common receptor (CD131) — without engaging the classical erythropoietic EpoR homodimer, thereby separating EPO's tissue-protective signaling from its hematopoietic effects. By selectively engaging the IRR rather than the erythropoietic receptor, cibinetide activates anti-inflammatory and anti-apoptotic intracellular pathways in neurons, endothelium, and other metabolically active tissues without causing erythrocytosis, hypertension, or thrombosis, making it a candidate for neuropathy and inflammatory tissue injury contexts. Randomized, double-blind Phase 2 clinical trials have demonstrated that cibinetide improves metabolic control and neuropathic symptom scores in patients with type 2 diabetes, and a separate study demonstrated improved corneal nerve fiber abundance in patients with sarcoidosis-associated small fiber neuropathy — providing human proof-of-concept for both diabetic and inflammatory peripheral neuropathy applications. Cibinetide (ARA 290) is an investigational compound that has not received FDA approval for any indication; Phase 2 data supports further investigation in peripheral neuropathies, but no Phase 3 completion or regulatory filing has occurred as of 2025.

CNS-targeted peptide complex that modulates neuronal gene expression. Shown in Russian clinical studies to improve memory consolidation, attention, and protect against neurodegeneration.

Cerluten is a synthetic short peptide classified as a Khavinson-class bioregulator targeted at cerebral and central nervous system tissue, investigated for neuroprotective and anti-aging properties in neuronal cell populations through proposed gene expression regulatory mechanisms. Like other Khavinson bioregulator peptides, cerluten is proposed to reach target neuronal cells via amino acid transporter uptake — including proton-coupled oligopeptide transporters (POT) and large amino acid transporters (LAT) — and to modulate transcriptional activity in aging or damaged neural tissue. Published research on Khavinson-class ultrashort peptides has characterized intracellular transport via POT and LAT carriers and demonstrated gene expression regulatory effects across multiple tissue types, providing the class-level mechanistic framework within which cerluten's neuronal effects are proposed. Cerluten has no FDA approval or regulatory approval in any major Western jurisdiction; evidence derives from Khavinson-series preclinical and class-level studies with no independent clinical trials published in Western-indexed journals. Cerluten dosing and respiratory applications Cerluten is classified as a bronchial tissue bioregulator in the Khavinson peptide research tradition, proposed to act on bronchial epithelial cells via amino acid transporter uptake and modulate gene expression related to respiratory tissue maintenance and oxidative stress response in aging airways. Preclinical and observational research in Eastern European clinical settings has examined cerluten in contexts of chronic bronchitis, age-related decline in respiratory function, and COPD support, with proposed mechanisms including anti-inflammatory gene regulation and bronchial epithelial cell cytoprotection. Standard Khavinson-class dosing protocols use oral capsule formulations in 10–20 day cycles at 5–10mg per cycle (divided doses), followed by rest intervals — consistent with the gene-regulatory rather than continuous-receptor-occupancy mechanism proposed for this peptide class. Independent peer-reviewed clinical trial evidence specific to cerluten is limited; efficacy data comes primarily from Khavinson Institute publications and observational reports. Cerluten is available from specialty Eastern European supplement and peptide vendors and is not approved by the FDA or EMA as a pharmaceutical. It is distinct from Chonluten, which targets lung parenchyma rather than bronchial epithelial tissue.