Background:The pathology of Marfan syndrome is caused by insufficient fibrillin-1 microfibril formation in connective tissues. Results: Successful improvement of Marfan syndrome manifestations are induced by the direct administration of recombinant ADAMTSL6. Conclusion: This study demonstrated critical importance of microfibril regeneration in preventing Marfan syndrome. Significance: Our current data support a new concept that the regeneration of microfibrils using ADAMTSL6 is essential for improving Marfan syndrome.