Vesilute

Vesilute is a synthetic short peptide supplied as a research compound within the Khavinson class of peptide bioregulators — the family of ultrashort (2–7 residue) peptides developed in the St. Petersburg Institute of Bioregulation and Gerontology program and studied for tissue-directed regulation of gene expression. Within that series it is the member conventionally associated with the urinary bladder and lower urogenital tract, and its name is usually traced to the Latin vesica (bladder). Sources disagree on its exact composition — some describe a Glu-Asp dipeptide, others a Lys-Glu-Asp tripeptide — and no compound record resolves in PubChem under the name Vesilute, so this listing deliberately publishes no sequence, formula, molecular weight, or CAS number; identity should be taken from the lot-specific certificate of analysis. This material is supplied for research use only and is not for human consumption.

No peer-reviewed mechanistic study of Vesilute itself has been identified, so any account of its activity is framed by the wider ultrashort-peptide literature rather than by direct evidence for this compound. That literature proposes that short peptides act as intracellular regulatory signals: reviews of the class describe peptides of 2–7 residues entering cell nuclei and interacting with nucleosomes, histone proteins, and single- and double-stranded DNA, with effects on transcription and DNA methylation status. Transport analyses for the same class suggest that di- and tripeptides can be carried into cells by proton-coupled oligopeptide (POT/PEPT) and L-type amino-acid (LAT) transporters, a route proposed to underlie the tissue selectivity these peptides are reported to show. In bladder-directed work these ideas are tested against urothelial and detrusor endpoints — barrier and tight-junction proteins, contractile gene programs, inflammatory signaling — in in-vitro and preclinical models only.

Gene-Expression Framework for Short Peptide Bioregulators

Khavinson and colleagues (2021) published a systematic review of peptide regulation of gene expression, reporting that short peptides of 2–7 amino-acid residues can penetrate cell nuclei and nucleoli, interact with nucleosomes, histones, and single- and double-stranded DNA, and influence DNA methylation status. The review establishes the theoretical framework for the peptide class to which Vesilute is assigned; it reviews the class as a whole and does not present data on Vesilute [1].

Cellular Transport of Ultrashort Peptides

Khavinson et al. (2022) reviewed transport of biologically active ultrashort peptides by POT-family carriers (PEPT1, PEPT2, PHT1, PHT2) and LAT carriers, concluding from molecular-modeling and physicochemical data that di- and tripeptides can be moved into cells of various tissues by these transporters, and proposing this as a basis for the tissue specificity attributed to such peptides. The analysis addresses the ultrashort-peptide class generally rather than Vesilute specifically [2].

Urothelial Signaling and Bladder Wall Biology

Birder and Andersson (2013) reviewed urothelial signaling in Physiological Reviews, describing the urothelium as both a high-resistance barrier and a sensory tissue that releases ATP, nitric oxide, and acetylcholine and expresses P2X3 purinergic, muscarinic, nicotinic, and TRP channels linking it to interstitial cells, afferent nerves, and detrusor muscle. This is a bladder-physiology review with no connection to peptide bioregulators; it is cited here because it defines the urothelial and detrusor endpoints used in bladder-directed peptide research [3].