Bioengineered uteri support pregnancy

Date:
June 29, 2020
Source:
Wake Forest Baptist Medical Center
Summary:
Scientists were able to show that bioengineered uteri in an animal
model developed the native tissue-like structures needed to support
normal reproductive function.



FULL STORY ==========================================================================
In new research from the Wake Forest Institute for Regenerative
Medicine (WFIRM), scientists have shown that bioengineered uteri
supported fertilization, fetal development, and live birth with normal offspring. With further development, this approach may someday provide
a regenerative medicine solution for women with the inability to get
pregnant due to uterine dysfunctional infertility

========================================================================== Published today in the journal Nature Biotechnology, the scientists
were able to show that bioengineered uteri in an animal model developed
the native tissue-like structures needed to support normal reproductive function.

"The study shows that engineered uterine tissue is able to support normal pregnancies, and fetal development was normal, with offspring size and
weight being comparable to those from a normal uterus," said Anthony
Atala, MD, study principal investigator and director of WFIRM. "With
further development, this approach may provide a pathway to pregnancy for
women with an abnormal uterus." WFIRM scientists are world leaders in
the field of regenerative medicine and a number of the basic principles
of tissue engineering and regenerative medicine were first developed at
the institute. Their strategy to bioengineer functional tissues using
a patient's own cells seeded onto biodegradable scaffolds has been
effectively explored in preclinical studies and applied successfully in
human patients to restore function in tubular and in hollow non-tubular
organs.

Regenerative medicine and tissue engineering technologies have emerged
as an attractive option for overcoming donor organ shortages and other limitations of transplantation from donors. The scientists used the same bioengineering strategy to engineer the uterus, a more complex organ with higher functional requirements involving support of embryo implantation
and fetal development.

For this study, rabbits were randomly assigned to four groups: (1)
a tissue- engineered uteri group that received a cell-seeded scaffold
using the animals' own cells; (2) a non-seeded scaffold group, that
received a polymer scaffold only; (3) a subtotal uterine excision-only
control group, where the subtotal excision was repaired by suturing and
(4) a normal control group, where animals underwent a sham laparotomy.

Rabbits have long been used in reproductive biology research and are
ideal for uterine tissue regeneration studies as they have a relatively
large uterus compared with other laboratory animals. The female rabbit's
uterus is formed by two separated, functional uterine horns and cervices,
each with a capacity to carry a pregnancy.

The biodegradable polymer scaffold constructs were custom-made for
each animal.

The cells needed to regenerate the uterine tissue and seed the scaffolds
were cultured and grown from the uterine structures of each rabbit. Six
months after undergoing the scaffold implantation procedure, the rabbits
were naturally mated with fertile male rabbits.

"The rabbits with cell-seeded constructs had normal pregnancies in the reconstructed segments of the uteri," said co-author Renata S. Magalhaes,
MD, PhD, BCMAS. "This research introduces new avenues for potentially
creating tissue substitutes derived from a patient's own cells to treat
uterine defects." Uterine transplantation from deceased and living
donors to patients has shown promise as a treatment for permanent uterine infertility although it requires the use of anti-rejection therapies.

To date, there have been about 70 uterus transplants performed
worldwide. In the United States, fewer than 10 babies have been born via
a transplanted uterus. This proposed strategy, creating uterine tissue
with a patient's own cells, avoids the need for a transplanted organ
from a deceased or living donor, and avoids the risk of rejection and
the need for antirejection drugs.

"Our results indicate that the tissue-engineered uteri responded to
the expansion and mechanical strains that occur during pregnancy," said co-author Koudy Williams, DVM. "Further preclinical studies are being
planned before clinical trials are contemplated."

========================================================================== Story Source: Materials provided by
Wake_Forest_Baptist_Medical_Center. Note: Content may be edited for
style and length.


========================================================================== Journal Reference:
1. Renata S. Magalhaes, J. Koudy Williams, Kyung W. Yoo, James J. Yoo,
Anthony Atala. A tissue-engineered uterus supports live births in
rabbits. Nature Biotechnology, 2020; DOI: 10.1038/s41587-020-0547-7 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2020/06/200629120217.htm

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