Glycyl-L-histidyl-L-lysine-Cu2+ (GHK-Cu) Attenuates CuSO4 or LPS induced-inflammation in Zebrafish larvae model
Hu J, Zhang C, Wang F
European Journal of Pharmacology (2026)
In a zebrafish larvae inflammation model, GHK-Cu suppressed neutrophil and macrophage migration, downregulated TNF-α, IL-1β, and IL-6, upregulated IL-10, and attenuated JAK1 signalling — extending the cosmetic-skin GHK-Cu literature into a whole-organism inflammation readout.
Hu, Zhang, and Wang at Yunnan Botanee Bio-Technology and Shanghai Jiyan Bio-pharmaceutical report on the anti-inflammatory and anti-oxidant activities of the tripeptide-copper complex GHK-Cu in zebrafish larvae exposed to either copper sulfate (CuSO4) or lipopolysaccharide (LPS) — two complementary acute inflammation models. Zebrafish larvae are increasingly used as an intermediate whole-organism screening platform between cell culture and rodent work because transparency allows direct fluorescence-based tracking of immune cell migration, and the innate immune system is functionally conserved with mammals.
GHK-Cu treatment reduced migration of neutrophils and macrophages to the inflammatory focus in both CuSO4- and LPS-induced models. At the cytokine level, the peptide suppressed mRNA expression of pro-inflammatory TNF-α, IL-1β, and IL-6, and elevated the anti-inflammatory cytokine IL-10. Oxidative-stress markers shifted in parallel: nitric oxide and reactive oxygen species declined and superoxide dismutase activity rose. KEGG pathway analysis attributed the effect at least in part to downregulation of the JAK1 signalling axis. The authors frame the work as theoretical support for GHK-Cu's continued use as a functional cosmetic ingredient.
The paper sits adjacent to the older Pickart 2018 gene-data review and the Maquart 1988 collagen-fibroblast work — both of which established GHK-Cu's tissue-repair and gene-expression-modulating effects in cell culture and human tissue. The zebrafish data adds a whole-organism layer to the otherwise cell-culture-dominated mechanistic corpus. It does not address chronic systemic exposure, dosing relevant to human topical or injectable use, or any disease model — only acute chemically- and pathogen-induced inflammation in a larval vertebrate.
This is a zebrafish-larvae mechanistic study, not a clinical or even mammalian-disease-model paper. The inferential chain from larval zebrafish to topical human dermatologic outcomes — let alone injectable or systemic use — is long. The CuSO4 model has the specific awkwardness that copper itself is the inflammatory stimulus; the authors are administering a copper-containing peptide to attenuate a copper-driven response, which raises questions about whether the protective signal reflects GHK-Cu-specific bioactivity or buffered copper kinetics. The LPS arm of the experiments is the cleaner inflammation readout.
The authors are employed by Yunnan Botanee Bio-Technology and affiliated cosmetic-ingredient laboratories, and the paper closes with an explicit framing of GHK-Cu as a functional cosmetic ingredient. There is no declared external commercial sponsorship beyond the institutional affiliation, but the editorial reader should note that this is industry-internal mechanistic research published in a peer-reviewed pharmacology journal, not independent academic work. Dose-ranging and pharmacokinetic data are not the focus of the paper; the abstract reports qualitative cytokine shifts and pathway analysis rather than concentration-response curves or comparison against a positive-control anti-inflammatory.
JAK1 pathway downregulation is reported via pathway-enrichment analysis; the abstract does not specify whether functional JAK1 knockdown or inhibitor experiments were performed to test causation. Read the JAK1 result as a candidate mechanism flagged by gene-expression analysis rather than a demonstrated mechanistic chain.
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