GHK Peptide Effectively Neutralizes Toxic Acrolein Through Chemical Sequestration

Acrolein is a highly reactive and toxic aldehyde, a byproduct of lipid peroxidation and environmental exposure, strongly implicated in the pathogenesis of various diseases such as atherosclerosis, neurodegeneration, and respiratory disorders. Its potent electrophilic nature causes significant cellular damage by reacting with proteins and DNA. Understanding how endogenous compounds can naturally neutralize acrolein is crucial for developing protective and therapeutic strategies against its harmful effects.

The study successfully identified and characterized the specific conjugation products formed between GHK and acrolein. Mass spectrometry data revealed that acrolein primarily reacted with the lysine side chain and the N-terminal amino group of the GHK peptide. They observed the formation of both mono-adducts (one acrolein molecule bound) and di-adducts (two acrolein molecules bound), demonstrating GHK's capacity for multiple binding events. The most significant finding was the confirmation that GHK effectively forms stable covalent bonds with acrolein via a Michael addition mechanism, thereby neutralizing its electrophilic reactivity. This chemical sequestration was robust across the tested conditions, indicating a strong affinity and protective potential. The theoretical calculations supported these experimental findings, providing insights into the stability and favored reaction pathways of the adducts.