title: Pharmacological induction of the 70-kDa heat shock protein protects against brain injury.
abstract: The 70-kDa heat shock protein (HSP70) is known to protect the brain from injury through multiple mechanisms. We investigated the effect of pharmacological HSP70 induction in experimental traumatic brain injury (TBI). 3-month-old male C57/B6 mice were given 17-N-allylamino-17-demethoxygeldanamycin (17-AAG) intraperitoneally (IP, 2 mg/kg) or intracerebroventricularly (ICV, 1 μg/kg) to determine whether HSP70 could be induced in the brain. Mice were subjected to TBI via cortical controlled impact, and were treated with 17-AAG (or vehicle) IP according to one of two treatment regimens: (1) 2 mg/kg at the time of injury, (2) a total of three doses (4 mg/kg) at 2 and 1d prior to TBI and again at the time of injury. Brains were assessed for HSP70 induction, hemorrhage volume at 3 d, and lesion size at 14 d post-injury. Immunohistochemistry showed that both IP and ICV administration of 17-AAG increased HSP70 expression primarily in microglia and in a few neurons by 24 h but not in astrocytes. 17-AAG induced HSP70 in injured brain tissue as early as 6 h, peaking at 48 h and largely subsiding by 72 h after IP injection. Both treatment groups showed decreased hemorrhage volume relative to untreated mice as well as improved neurobehavioral outcomes. These observations indicate that pharmacologic HSP70 induction may prove to be a promising treatment for TBI.
authors.affiliation: Department of Neurology, University of California, San Francisco and Veterans Affairs Medical Center, San Francisco, CA 94121, USA. Electronic address: nuri@berkeley.edu.
authors.forename: N
authors.initials: N
authors.lastname: Kim
authors.affiliation: Department of Neurology, University of California, San Francisco and Veterans Affairs Medical Center, San Francisco, CA 94121, USA. Electronic address: jongyoul74@gmail.com.
authors.forename: J Y
authors.initials: JY
authors.lastname: Kim
authors.affiliation: Department of Neurology, University of California, San Francisco and Veterans Affairs Medical Center, San Francisco, CA 94121, USA. Electronic address: yenari@alum.mit.edu.
authors.forename: M A
authors.initials: MA
authors.lastname: Yenari
mesh_terms: D000818:Animals; D001253:Astrocytes / Q000187:drug effects / Q000378:metabolism / Q000473:pathology; D016227:Benzoquinones / Q000008:administration & dosage*; D001921:Brain / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D020201:Brain Hemorrhage, Traumatic / Q000188:drug therapy / Q000378:metabolism / Q000473:pathology; D001930:Brain Injuries / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D004195:Disease Models, Animal; D018840:HSP70 Heat-Shock Proteins / Q000378:metabolism*; D047029:Lactams, Macrocyclic / Q000008:administration & dosage*; D008297:Male; D008810:Mice, Inbred C57BL; D017628:Microglia / Q000187:drug effects / Q000378:metabolism / Q000473:pathology; D009474:Neurons / Q000187:drug effects / Q000378:metabolism / Q000473:pathology; D018696:Neuroprotective Agents / Q000008:administration & dosage*; D013997:Time Factors; D016896:Treatment Outcome
chemical_list: D016227:Benzoquinones; D018840:HSP70 Heat-Shock Proteins; D047029:Lactams, Macrocyclic; D018696:Neuroprotective Agents; C112765:tanespimycin
keywords: animal studies; therapeutic approaches; traumatic brain injury