Evaluation of UW solution for preservation of small intestinal transplants in the rat.

Simple cold preservation was evaluated in the rat model of small intestinal transplantation. Lewis rats received a syngeneic heterotopic graft of the jejunum either immediately (SI) or after preservation for 24 hr in Euro-Collins (SPE24), for 48 hr in EC (SPE48), for 24 hr in University Wisconsin solution (SPW24), or for 48 hr in UW (SPW48). The survival rates of SI, SPE24, SPE48, SPW24, and SPW48 were 100%, 78%, 0%, 100%, and 33%, respectively. Physiologic and pharmacologic properties of the grafts and native intestine were evaluated in vitro between 8 and 12 days after transplantation. Smooth muscle in all specimens contracted in response to cholinergic agonists, phenylephrine, and substance P, and was relaxed by isoproterenol. Excitatory innervation was present in 100%, 100%, 100%, and 67% of SI, SPE24, SPW24, and SPW48, respectively, while inhibitory innervation in each group was 50%, 29%, 60%, and 0%. Thus, smooth muscle function was preserved in all groups, but neural activity was impaired by some of the storage conditions. Preservation was best in SPW24, which had physiologic responses similar to those of SI. The rat jejunum can, therefore, be preserved in good condition for up to 24 hr before transplantation using simple cold storage in UW solution.