Bioprosthetic ovaries produced mouse pups in otherwise infertile mice
The brave new world of 3-D printed organs now includes implanted ovary structures that, true to their design, actually ovulate, according to a Northwestern Medicine study published in Nature Communications.
By removing a female mouse’s ovary and replacing it with a bioprosthetic ovary, the mouse was able to not only ovulate but also give birth to healthy pups. The moms were even able to nurse their young.
The bioprosthetic ovaries are constructed of 3-D printed scaffolds that house immature eggs, and have been successful in boosting hormone production and restoring fertility in mice, which was the ultimate goal of the research.
“This research shows these bioprosthetic ovaries have long-term, durable function,” said Teresa Woodruff, ’89 PhD, chief of Reproductive Science in Medicine in the Department of Obstetrics and Gynecology. “Using bioengineering, instead of transplanting from a cadaver, to create organ structures that function and restore the health of that tissue for that person, is the holy grail of bioengineering for regenerative medicine.”
How is this research different from other 3-D printed structures?
What sets this research apart from other labs is the architecture of the scaffold and the material, or “ink,” the scientists are using, said Ramille Shah, PhD, assistant professor of Surgery in the Division of Organ Transplantation and of Materials Science and Engineering at the McCormick School of Engineering.
That material is gelatin, which is a biological hydrogel made from broken-down collagen that is safe to use in humans. The scientists knew that whatever scaffold they created needed to be made of organic materials that were rigid enough to be handled during surgery and porous enough to naturally interact with the mouse’s body tissues.
“Most hydrogels are very weak, since they’re made up of mostly water, and will often collapse on themselves,” Shah said. “But we found a gelatin temperature that allows it to be self-supporting, not collapse, and lead to building multiple layers. No one else has been able to print gelatin with such well-defined and self-supported geometry.”
That geometry directly links to whether or not the ovarian follicles, organized hormone-producing support cells surrounding an immature egg cell, will survive in the ovary, which was one of the bigger findings in the study.
“This is the first study that demonstrates that scaffold architecture makes a difference in follicle survival,” Shah said. “We wouldn’t be able to do that if we didn’t use a 3-D printer platform.”
How does this impact humans?
The scientists’ sole objective for developing the bioprosthetic ovaries was to help restore fertility and hormone production in women who have undergone adult cancer treatments or those who survived childhood cancer and now have increased risks of infertility and hormone-based developmental issues.
“What happens with some of our cancer patients is that their ovaries don’t function at a high enough level and they need to use hormone replacement therapies in order to trigger puberty,” said Monica Laronda, ’11 PhD, co-lead author of this research and a former post-doctoral fellow in the Woodruff lab, now an assistant professor of Pediatrics in the Division of Endocrinology. “The purpose of this scaffold is to recapitulate how an ovary would function. We’re thinking big picture, meaning every stage of the girl’s life, so puberty through adulthood to a natural menopause.”
Additionally, the successful creation of 3-D printed implants to replace complex soft tissue could significantly impact future work in soft tissue regenerative medicine.
How does biological 3-D printing work?
3-D printing an ovary structure is similar to a child using Lincoln Logs, said Alexandra Rutz, PhD, co-lead author of the study and a former biomedical engineering graduate fellow in Shah’s Tissue Engineering and Additive Manufacturing (TEAM) lab at the Simpson Querrey Institute for BioNanotechnology. Children can lay the logs at right angles to form structures. Depending on the distance between the logs, the structure changes to build a window or a door, etc.
“3-D printing is done by depositing filaments,” said Rutz, who is now a Whitaker International Postdoctoral Scholar at École Des Mines De Saint-Étienne in Gardanne, France. “You can control the distance between those filaments, as well as the advancing angle between layers, and that would give us different pore sizes and different pore geometries.”
In Northwestern’s lab, the scientists call these 3-D printed structures “scaffolds,” and liken them to the scaffolding that temporarily surrounds a building while it undergoes repairs.
“Every organ has a skeleton,” said Woodruff, who is also the Thomas J. Watkins Memorial Professor of Obstetrics and Gynecology and a member of the Robert H. Lurie Comprehensive Cancer Center of Northwestern University. “We learned what that ovary skeleton looked like and used it as model for the bioprosthetic ovary implant.”
In a building, the scaffolding supports the materials needed to repair the building until it’s eventually removed. What’s left is a structure capable of holding itself up. Similarly, the 3-D printed “scaffold” or “skeleton” is implanted into a female and its pores can be used to optimize how follicles, or immature eggs, get wedged within the scaffold. The scaffold supports the survival of the mouse’s immature egg cells and the cells that produce hormones to boost production. The open structure also allows room for the egg cells to mature and ovulate, as well as blood vessels to form within the implant, enabling the hormones to circulate within the mouse bloodstream and trigger lactation after giving birth.
The all-female McCormick-Feinberg collaboration for this research was “very fruitful,” Shah said, adding that it was motivational to be part of an all-female team doing research towards finding solutions to female health issues.
“What really makes a collaboration work are the personalities and being able to find the humor in the research,” Shah said. “Teresa and I joked that we’re grandparents of these pups.”
This research was conducted in partnership with the Stanley Manne Children’s Research Institute at Ann & Robert H. Lurie Children’s Hospital of Chicago.