This tiny peptide could help stop brain damage after injury

A four–amino acid peptide called CAQK has shown powerful brain-protective effects in animal models of traumatic brain injury. Delivered through a standard IV, it zeroes in on injured brain tissue, calming inflammation and reducing cell death while improving recovery. The peptide worked in both mice and pigs, whose brains are closer to humans in structure. Researchers are now preparing to move toward early human clinical trials.

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A global research team led by the company Aivocode, working with scientists from the Institute for Advanced Chemistry of Catalonia (IQAC) of the Spanish National Research Council (CSIC), reports that a small compound has a strong protective effect in mouse models of traumatic brain injury. The compound is a peptide made from four amino acids called CAQK.

In animal tests (mice and pigs), researchers gave CAQK through an IV soon after injury. The peptide was drawn to damaged parts of the brain because it is attracted to a protein that becomes unusually abundant in injured tissue after trauma. CAQK built up where this protein was concentrated and helped reduce inflammation, cell death, and harm to brain tissue. In mice, the treatment also improved functional recovery and showed no obvious toxicity.

The findings were published in EMBO Molecular Medicine and point to new ways to treat injured brain regions. The work was led by Aivocode (a spin-off of the Sanford Burnham Prebys Institute) in San Diego, California, in partnership with IQAC-CSIC and the University of California, Davis.

Aivocode was founded by researchers Aman P. Mann, Sazid Hussain, and Erkki Ruoslahti (authors of the study). The company says it plans to seek permission from the U.S. Food and Drug Administration (FDA) to begin Phase I clinical trials in humans. No timeline has been announced, but CAQK's small size matters because it is a short peptide that is easier to manufacture and can penetrate tissue well, making it a promising drug candidate.

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