A peptide (FNLRMQ) derived from pufferfish skin collagen showed ACE-inhibiting activity and protected blood vessel cells from damage through Nrf2/HO-1 and PI3K/Akt/eNOS pathways.
Dual pathway protectionFNLRMQ activated both Nrf2/HO-1 antioxidant and PI3K/Akt/eNOS vascular protective signaling
What the researchers found
The collagen-derived peptide FNLRMQ inhibits ACE activity and protects blood vessel endothelial cells from angiotensin II-induced injury through Nrf2/HO-1 and PI3K/Akt/eNOS signaling pathways.
Why it matters
High blood pressure affects over a billion people worldwide. Natural ACE-inhibiting peptides from marine sources could provide alternatives to synthetic ACE inhibitor drugs with potentially fewer side effects.
The numbers in context
Peptide FNLRMQ; ACE inhibition confirmed; Nrf2/HO-1 and PI3K/Akt/eNOS pathways activated
How the study worked
Molecular docking to identify ACE-inhibitory peptides from pufferfish collagen hydrolysate, followed by in vitro testing on angiotensin II-induced HUVECs for cell viability, apoptosis, and signaling pathway analysis.
Who was studied
Human umbilical vein endothelial cells (HUVECs) in culture
What this study cannot tell us
In vitro study only using human cell lines. No animal or human trial data. Single peptide tested. Bioavailability and stability in the body not assessed.
How to read the evidence
In vitro study with human endothelial cells and clear mechanistic data. Preliminary evidence requiring animal model validation.
When this study was published
Published in 2021, part of growing interest in marine-derived bioactive peptides.
The bigger picture
Marine-derived bioactive peptides are an expanding area of pharmaceutical research. This study demonstrates that fish skin, often discarded as waste, can yield peptides with genuine therapeutic potential for cardiovascular health.
Questions still open
- Would FNLRMQ lower blood pressure in animal models?
- How does this peptide's ACE inhibition compare to established drugs like lisinopril?
- Can the peptide survive digestion to reach the bloodstream?
Common questions
What is ACE and why does blocking it help blood pressure?
Could a fish skin peptide really become a blood pressure medication?
Read the original research
ACE Inhibitory Peptide from Skin Collagen Hydrolysate of Takifugu bimaculatus as Potential for Protecting HUVECs Injury.
Marine drugs, 19(12)
Citation
Cai, Shuilin; Pan, Nan; Xu, Min; Su, Yongchang; Qiao, Kun; Chen, Bei; Zheng, Bingde; Xiao, Meitian; Liu, Zhiyu. (2021). ACE Inhibitory Peptide from Skin Collagen Hydrolysate of Takifugu bimaculatus as Potential for Protecting HUVECs Injury.. Marine drugs, 19(12). https://doi.org/10.3390/md19120655