A novel method for preserving human lungs using a super-cooling system.

PURPOSE: To ensure the suitable preservation of isolated lungs, a super-cooling system was used to cool water to temperatures as low as -5 degrees C without freezing. DESCRIPTION: After lung tissues were obtained from patients with lung cancer, they were kept at -5 degrees C or 4 degrees C for as many as 5 days, and then they were histologically and biochemically examined. To evaluate biochemical stability, tissues after storage were passively sensitized with immunoglobulin E and then incubated with anti-immunoglobulin-E antibody. EVALUATION: Although tissues preserved at -5 degrees C for 5 days had an almost normal appearance with intact cilia on bronchial epithelium and normal endothelium, tissues stored at 4 degrees C showed degradation of these structures. Single-stranded DNA, a sign of DNA cleavage, was frequently noted in tissues stored at 4 degrees C, but only rarely observed at -5 degrees C. A significant amount of cysteinyl-leukotrienes was generated from tissues stored at -5 degrees C for 3 days, but there was no response to antibody stimulation from tissues stored at 4 degrees C.
CONCLUSIONS: Super-cooling systems may provide useful applications as a novel preserving method.