CP and Hydrocephalus: The main findings of this study were: (a) OX-6 (+) cells are predominately located in the stroma of CP in control rats; (b) in contrast, most of them appeared on the CP apical surface after Prx2 injection with an increased number; (c) the OX-6(+) cells in CP were reduced when Prx2 was co-injected with clodronate liposomes; (d) co-injecting Prx2 with clodronate liposomes attenuated neutrophil infiltration, hydrocephalus and ventricular wall damage.