Author(s): Saatman KE, Zhang C, Bartus RT, McIntosh TK
Administration of the selective calpain inhibitor AK295 has been shown to attenuate motor and cognitive dysfunction after brain trauma in rats. To explore mechanisms underlying the behavioral efficacy of posttraumatic calpain inhibition, we investigated histologic consequences of AK295 administration. Anesthetized Sprague-Dawley rats received lateral fluid percussion brain injury of moderate severity (2.2 to 2.4 atm) or served as uninjured controls. At 15 minutes after injury, animals were randomly assigned to receive a 48-hour infusion of either 2 mmol/L AK295 (120 to 140 mg/kg) or saline via the carotid artery. At 48 hours and 1 week after injury, spectrin fragments generated specifically by calpain were detected by Western blotting and immunohistochemistry, respectively, in saline-treated, brain-injured animals. Interestingly, equivalent spectrin breakdown was observed in AK295-treated animals when cortical and hippocampal regions were evaluated. Similarly, administration of the calpain inhibitor did not attenuate cortical lesion size or the numbers of apoptotic cells in the cortex, subcortical white matter, or hippocampus, as verified by terminal deoxynucleotidyl transferase-mediated biotinylated deoxyuridine triphosphate nick-end labeling and morphology, at 48 hours after injury. These data suggest that an overt reduction in spectrin proteolysis, cortical lesion, or apoptotic cell death at 48 hours or 1 week is not required for behavioral improvements associated with calpain inhibition by AK295 after experimental brain injury in rats.
Referred From: https://www.ncbi.nlm.nih.gov/pubmed/10616794
Author(s): Decuypere M, Klimo P Jr
Author(s): Blostein PA, Jones SJ, Buechler CM, Vandongen S
Author(s): Crevits L, Hanse MC, Tummers P, Van Maele G
Author(s): Bandtlow CE
Author(s): Brösamle C, Huber AB, Fiedler M, Skerra A, Schwab ME
Author(s): Mott TF, McConnon ML, Rieger BP
Author(s): McCrea M, Pliskin N, Barth J, Cox D, Fink J, et al.
Author(s): van Leeuwen N, Lingsma HF, Perel P, Lecky F, Roozenbeek B, et al.
Author(s): Zhou W, Xu D, Peng X, Zhang Q, Jia J, et al.
Author(s): Jager TE, Weiss HB, Coben JH, Pepe PE
Author(s): Shenton ME, Hamoda HM, Schneiderman JS, Bouix S, Pasternak O, et al.
Author(s): Bigler ED, Maxwell WL
Author(s): Königs M, de Kieviet JF, Oosterlaan J
Author(s): Rohling ML, Binder LM, Demakis GJ, Larrabee GJ, Ploetz DM, et al.
Author(s): Simmons AN, Matthews SC
Author(s): Panayiotou A, Jackson M, Crowe SF
Author(s): Caner H, Can A, Atalay B, Erdogan B, Albayrak AH, et al.
Author(s): Abu-Judeh HH, Parker R, Singh M, el-Zeftawy H, Atay S, et al.
Author(s): Atalay B, Caner H, Can A, Cekinmez M
Author(s): Tymianski M, Tator CH
Author(s): Abrous DN, Rodriguez J, le Moal M, Moser PC, Barnéoud P
Author(s): Büki A, Koizumi H, Povlishock JT
Author(s): Blumbergs PC, Scott G, Manavis J, Wainwright H, Simpson DA, et al.
Author(s): Büki A, Siman R, Trojanowski JQ, Povlishock JT
Author(s): Geddes JF, Vowles GH, Nicoll JA, Révész T
Author(s): Posmantur R, Kampfl A, Siman R, Liu J, Zhao X, et al.
Author(s): Kampfl A, Posmantur R, Nixon R, Grynspan F, Zhao X, et al.
Author(s): Ercan M, Inci S, Kilinc K, Palaoglu S, Aypar U