GHRP-6
Growth Hormone Releasing Peptide-6, Growth hormone-releasing hexapeptide, His-D-Trp-Ala-Trp-D-Phe-Lys-NH2
Early Detection of Growth Hormone Secretagogue Receptor Antagonists Exploiting Their Atypical Behavior in Competitive Assays.
Danila. George Madalin GM; Puiu. Mihaela M; Zamfir. Lucian-Gabriel LG; Bala. Camelia C
Key Findings
- A new bio‑affinity assay can detect GHS‑R1a antagonists in urine samples.
- At low antagonist concentrations, the blockers surprisingly enhance the ghrelin‑receptor interaction.
- The assay can calculate affinity constants for both ghrelin‑receptor and antagonist‑receptor binding and works with optical, electrochemical, and mass‑sensitive readouts.
Practical Outcomes
- For most biohackers, this study doesn’t change how you would use GHRP‑6 or similar peptides, but it shows that some GHS‑R1a blockers can behave unexpectedly in tests. The method could be useful for labs that want to screen for doping agents or monitor unintended antagonist exposure, not for personal dosing protocols.
Summary
Scientists created a lab test that can spot chemicals that block the growth‑hormone‑releasing receptor (GHS‑R1a) in urine. They found that, oddly, these blockers actually make the natural hormone ghrelin stick to the receptor better when only tiny amounts are present. The test can measure how tightly both the hormone and the blockers bind to the receptor and works with several detection methods.
Abstract
We report the proof-of-concept of a bioaffinity format designed for the early detection of growth hormone secretagogue receptor (GHS-R1a) antagonists in urine samples. We exploit here their atypical behavior in competitive experiments with labeled ghrelin (GHR), namely, the strong promoting effect on the GHR/GHS-R1a interaction at low molar ratios GHR/antagonist. The antagonists potentiate the GHR/GHS-R1a interaction, and they display the same effect on the interaction of GHS-R1a with other agonists listed as doping agents. The developed assay allows the estimation of affinity constants of ligand/receptor and antagonist/receptor binding and is amenable to optical, electrochemical, and mass-sensitive detection. The estimated affinity constants for GHR/GHS-R1a and antagonist/GHS-R1a in the absence of G proteins are in good agreement with recently reported data.
Study Information
pubmed
2019
2019-11-14T00:00:00.000Z
10.1021/acs.analchem.9b03845
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