title: Effects of FK506 on the translocation of protein kinase C and CaM kinase II in the gerbil hippocampal CA1 neurons.
abstract: To explore biochemical basis for cerebroprotective effect of immunosuppressant FK506, we studied changes in subcellular distribution of protein kinase C gamma (PKC gamma) as well as calcium/calmodulin-dependent protein kinase II (CaMKII) after ischemia. Male Mongolian gerbils were subjected to 5 min forebrain ischemia. FK506 (1 or 3 mg kg-1) was administered at 1 min after recirculation, which was confirmed to be cerebroprotective by histological examination at seven days after ischemia. At the designated time points (before ischemia, 5 min ischemia, 1 and 24 h recovery), heads were frozen and samples were taken from CA1 subfield of hippocampus. Western blot analysis was carried out. Persistent translocations of PKC gamma and CaMKII to synaptosomal P2 fraction were observed in vehicle-treated group. FK506 significantly decreased levels of PKC gamma and CaMKII in P2 fraction at 24 h of recovery. The present results suggest FK506 downregulates translocated PKC gamma and CaMKII, which may contribute to its survival promoting effect after cerebral ischemia.
authors.affiliation: Second Department of Internal Medicine, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-Ku, Tokyo 113-8603, Japan. k-katsur@nms.ac.jp
authors.forename: Ken-ichiro
authors.initials: K
authors.lastname: Katsura
authors.forename: Junichi
authors.initials: J
authors.lastname: Kurihara
authors.forename: Tomoharu
authors.initials: T
authors.lastname: Hiraide
authors.forename: Kumiko
authors.initials: K
authors.lastname: Takahashi
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Kato
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Katayama
mesh_terms: D000818:Animals; D054732:Calcium-Calmodulin-Dependent Protein Kinase Type 2; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000378:metabolism*; D005849:Gerbillinae; D006624:Hippocampus / Q000166:cytology; D007166:Immunosuppressive Agents / Q000494:pharmacology*; D002546:Ischemic Attack, Transient / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D008297:Male; D009474:Neurons / Q000201:enzymology*; D018696:Neuroprotective Agents / Q000494:pharmacology; D011493:Protein Kinase C / Q000378:metabolism*; D016559:Tacrolimus / Q000494:pharmacology*
chemical_list: D007166:Immunosuppressive Agents; D018696:Neuroprotective Agents; D011493:Protein Kinase C; D054732:Calcium-Calmodulin-Dependent Protein Kinase Type 2; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D016559:Tacrolimus