Sperm Grown in Lab for First Time If it works in humans, it could help with men's infertility By John Johnson, Newser Staff Posted Mar 23, 2011 6:28 PM CDT Updated Mar 27, 2011 3:37 PM CDT 37 comments Comments File image: Scientists have grown sperm for the first time in the laboratory. (Shutterstock) (Newser) – Japanese researchers have grown sperm in the laboratory for the first time, reports Nature. If the breakthrough with mice transfers to humans, it could open up IVF treatments for infertile men, notes the Guardian. Scientists created the sperm from the testicular tissue of mice and successfully produced a dozen baby mice with it. The tissue worked even after being frozen, suggesting that men—or even boys too young to produce sperm—could freeze tissue for later use if they were undergoing chemotherapy or other treatments that can cause infertility. "The report is quite exciting because it represents the fulfillment of a goal held by many reproductive biologists over many years," says an expert in the field at the Jackson Laboratory in Bar Harbor, Maine.