End-to-end anastomosis between tissue-engineered intestine and native small bowel

Area of Science:

• Regenerative Medicine
• Gastroenterology
• Biomaterials Science

Background:

• Tissue engineering offers potential solutions for intestinal defects.
• Developing functional, implantable intestinal tissue remains a significant challenge.
• Surgical connection (anastomosis) to native bowel is critical for integration and growth.

Purpose of the Study:

• To assess the feasibility of creating an end-to-end anastomosis between engineered intestine and native small bowel.
• To evaluate the impact of this anastomosis on the growth and development of the engineered intestinal tissue.

Main Methods:

• Biodegradable polymer tubes (polyglycolic acid/polylactic acid) were fabricated.
• Intestinal organoids from Lewis rats were seeded onto the polymer scaffolds.
• Constructs were implanted into the omentum of adult Lewis rats for 3 weeks.
• Anastomosis to the native jejunum was performed in a subset of rats.
• Tissue-engineered intestine was harvested 10 weeks post-implantation for analysis.

Main Results:

• A moderately high anastomosis patency rate of 78% was achieved.
• The engineered intestine maintained its size, with lengths of 1.80 cm at 3 weeks and 1.93 cm at 10 weeks.
• Histological analysis revealed a well-developed neomucosa continuous with the native intestinal lining.

Conclusions:

• End-to-end anastomosis between tissue-engineered intestine and native small bowel is feasible.
• The anastomosis positively influences the size maintenance and neomucosal development of the engineered intestine.
• This approach shows promise for future intestinal regeneration strategies.