Oxygenation by Intravascular Photosynthesis Reduces Kidney Damage During ex Vivo Preservation

Area of Science:

• Biomedical Engineering
• Cellular Biology
• Transplantation Science

Background:

• Clinical issues arise from reduced tissue oxygen delivery due to impaired vascular perfusion.
• Organs for transplantation face severe hypoxia during preservation, necessitating alternative oxygenation strategies.
• Intravascular photosynthesis, utilizing microorganisms to produce oxygen, is a promising research area.

Purpose of the Study:

• To develop photosynthetic perfusable solutions for organ preservation in transplantation.
• To evaluate the efficacy of *Chlamydomonas reinhardtii* in meeting the oxygen demands of ex vivo tissues.
• To assess the safety and impact of algae-perfused solutions on organ viability.

Main Methods:

• Developed a biocompatible physiological solution with *Chlamydomonas reinhardtii*.
• Assessed the solution's ability to meet the metabolic oxygen demand of rat kidney slices in vitro.
• Administered the solution intravascularly in rats to evaluate tissue compatibility.
• Incubated algae-perfused kidney slices under hypoxic conditions with light exposure for 24 hours.

Main Results:

• The photosynthetic solution fulfilled the metabolic oxygen demand of rat kidney slices.
• Intravascular administration of the solution did not cause tissue damage in rat kidneys.
• Kidney slices from algae-perfused organs showed improved preservation, reduced damage, and better metabolic status after hypoxic incubation.

Conclusions:

• Perfusable photosynthetic solutions using microalgae are a viable strategy for tissue oxygenation.
• This approach offers a promising alternative for organ preservation in transplantation.
• Further development supports the use of intravascular photosynthesis for enhancing organ viability.