AB160. Intracavernous transplantation of bone marrow-derived mesenchymal stem cells restores erectile function of streptozocin-induced diabetic rats

INTRODUCTION Erectile dysfunction (ED) is a frequent complication of diabetes mellitus. The efficacy of common ED therapies is low for diabetes-associated ED. AIM To explore the effects of transplantation of bone marrow-derived mesenchymal stem cells (BM-MSCs) on improving erectile function of streptozocin (STZ)-induced diabetic rats. METHODS Male Sprague Dawley rats were injected either with STZ to induce diabetes or with citrate buffer as controls. Rat BM-MSCs were harvested and labeled with CM-DiI (Chloromethylbenzamido derivatives of 1,1'-dioctadecyl-3,3,3',3'-tetramethylindocarbocyanine perchlorate), and then transplanted into corporal cavernosum of STZ-induced diabetic rats. Four weeks after transplantation, all rats were analyzed for erectile function and penile histology. MAIN OUTCOME MEASURES Erectile function was evaluated by the ratio between intracavernous pressure (ICP) and mean arterial pressure (MAP) during electrostimulation of cavernous nerve. Fate of transplanted BM-MSCs was identified using immunofluorescence staining. Smooth muscle and endothelium in corpora cavernosum were assessed using immunohistochemistry. RESULTS After BM-MSCs transplantation, the ICP/MAP ratio was increased significantly compared with diabetic controls. Content of smooth muscle and endothelium in corporal cavernosa of BM-MSCs transplanted rats was significantly increased compared to diabetic controls. Immunofluorescence analysis demonstrated that CM-DiI-labeled BM-MSCs could stay in corporal cavernosa for at least 4 weeks and some of them expressed von Willebrand Factor, CD31, calponin, or α-smooth muscle actin, cells markers for endothelial cells or smooth muscle cells, respectively. CONCLUSION Intracavernous transplantation of BM-MSCs had beneficial effects on erectile function of diabetic rats and increased the content of endothelium and smooth muscle in corporal cavernosum.