Shi H et al. - Collectively, these data establish 1) an autoregulatory circuit of GDNF-induced GDNF expression in renal MSC; 2) induction of GDNF expression in postischemic kidneys; 3) the ability of exogenous GDNF to ameliorate ischemic renal injury; and 4) a possible contribution of GDNF-induced motility and improved survival of MSC to renoprotection