agonist-antibodies
(2)
Diagonal Therapeutics
Diagonal Therapeutics is a Watertown, Massachusetts biotech building 'clustering antibodies' - multi-specific, agonist antibodies that bind two or more cell-surface receptors at once to switch broken signaling pathways back on. Its DIAGONAL Product Engine combines computational and experimental screening to sift billions of antibody combinations for the rare ones that restore receptor activity. The lead program, DIAG723, restores dysregulated ALK1 signaling to address the root cause of hereditary hemorrhagic telangiectasia (HHT) and pulmonary arterial hypertension (PAH). Founded by Alex Lugovskoy with Atlas Venture, the company launched in 2024 with a $128M Series A and raised an oversubscribed $125M Series B in January 2026 to push DIAG723 into the clinic.
Alexey Lugovskoy
Alexey 'Alex' Lugovskoy is the co-founder and CEO of Diagonal Therapeutics, a Watertown/Cambridge, Massachusetts biotech building 'clustering' antibodies that switch cellular signaling back on rather than block it. A Harvard-trained biophysicist who left physics after deciding green leaves were more interesting than tau neutrinos, he spent two decades in antibody R&D at Biogen, Merrimack, Morphic, and Dragonfly before launching Diagonal in 2022. He has co-invented an FDA-approved cancer drug, authored more than 100 patents and papers, and edits the antibody journal mAbs. In January 2026 Diagonal closed an oversubscribed $125M Series B co-led by Sanofi Ventures and Janus Henderson to push its lead program, DIAG723, into human trials for hereditary hemorrhagic telangiectasia.