GHRP-6
Growth Hormone Releasing Peptide-6, Growth hormone-releasing hexapeptide, His-D-Trp-Ala-Trp-D-Phe-Lys-NH2
Aza-Isotryptophan: Synthesis, Pictet-Spengler Chemistry, Incorporation and Conformational Analysis in Peptides, and Activity in Modulators of the Cluster of Differentiation-36 Receptor.
Wei. Xiaozheng X; Mulumba. Mukandila M; Chemtob. Sylvain S; Ong. Huy H; Lubell. William D WD
Key Findings
- Aza‑isotryptophan was successfully synthesized and incorporated into peptides.
- GHRP‑6 analogs containing aza‑isotryptophan showed measurable binding to the CD36 receptor.
- These analogs modulated the inflammatory response triggered by the TLR2/6‑CD36 complex in vitro.
Practical Outcomes
- For now, the work is mainly a proof‑of‑concept that tweaking GHRP‑6’s structure can affect immune‑related pathways. Biohackers should see it as an interesting scientific hint, but there are no dosage guidelines, safety data, or real‑world protocols to apply yet.
Summary
Researchers made a special version of the amino acid tryptophan (aza‑isotryptophan) and put it into a peptide called GHRP‑6. The modified peptide showed it can bind to the CD36 receptor and may help calm inflammation linked to certain immune pathways. This is an early lab finding and not yet tested in people.
Abstract
Isotryptophan (Itr) is the rare 2-indoyl counterpart of the essential amino acid tryptophan. Considering the potential to explore novel side chain χ-space in a residue prone to adopt backbone turn conformers, azaItr has been effectively synthesized and employed in Pictet-Spengler and peptide chemistry. β-Turn geometry was characterized in model peptides of the Ala-azaItr-d-Phe triad by X-ray and NMR analyses. Moreover, azaItr analogs of growth hormone-releasing peptide 6 (GHRP-6) demonstrated a promising cluster of differentiation-36 receptor (CD36) binding affinity and modulatory effect on the inflammatory response induced by the activated complex composed of the latter coreceptor in the Toll-like receptor-2/6 heterodimer.
Study Information
pubmed
2025
2025-10-28T00:00:00.000Z
10.1021/acs.jmedchem.5c01693
40