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The researchers embedded a peptide, melittin, derived from European honey bee venom, into the membrane of the engineered RBCs. Melitin normally causes RBCs to rupture, but the scientists modified it so that it would only release a therapeutic agent when illuminated with a certain wavelength of light. They loaded the peptide with thrombin, which promotes blood clotting in the presence of a particular enzyme, and then injected the engineered RBCs into mice. When the team shone a laser light over parts of the mouse, they observed clotting only at those sites where the peptide had been exposed to the thrombin-releasing light.
Ruijun He and Baichuan Wang contributed equally as co-first authors. The peptide LPP (DHLSDNYTLDHDRAIH) was synthesized by standard solid phase peptide synthesis and characterized by electrospray ionization mass spectrometry. See Supplementary Material for the quality report of this synthetic peptide.