Lab-Grown Sperm Created Using Mouse Kidney Nurturing

Scientists have successfully created immature human sperm from stem cells, a development detailed in a study published online on July 10, 2026, in Nature. This breakthrough involves a novel technique where the stem cells are nurtured on a mouse's kidney. The research represents a significant step forward in the quest for new fertility treatments and a potential solution for infertility.

The procedure, described as sci-fi-like, involves coaxing human stem cells to develop into sperm cells. The use of a mouse's kidney as a nurturing environment provides the necessary biological support and conditions for this complex differentiation process. While the sperm created are immature, this achievement demonstrates the feasibility of generating human gametes outside the body. This could have profound implications for individuals and couples facing infertility challenges.

This advancement builds upon previous research in the field of reproductive biology and stem cell technology. The ability to grow sperm in a laboratory setting opens up possibilities for understanding sperm development and function more deeply. It also offers a potential avenue for preserving fertility in individuals undergoing treatments that may affect their reproductive capabilities, such as chemotherapy. The researchers aim to further refine the process to achieve mature, functional sperm.