title: Twenty-four hours hypothermia has temporary efficacy in reducing brain infarction and inflammation in aged rats.
abstract: Stroke is a major cause of disability for which no neuroprotective measures are available. Age is the principal nonmodifiable risk factor for this disease. Previously, we reported that exposure to hydrogen sulfide for 48 hours after stroke lowers whole body temperature and confers neuroprotection in aged animals. Because the duration of hypothermia in most clinical trials is between 24 and 48 hours, we questioned whether 24 hours exposure to gaseous hypothermia confers the same neuroprotective efficacy as 48 hours exposure. We found that a shorter exposure to hypothermia transiently reduced both inflammation and infarct size. However, after 1 week, the infarct size became even larger than in controls and after 2 weeks there was no beneficial effect on regenerative processes such as neurogenesis. Behaviorally, hypothermia also had a limited beneficial effect. Finally, after hydrogen sulfide-induced hypothermia, the poststroke aged rats experienced a persistent sleep impairment during their active nocturnal period. Our data suggest that cellular events that are delayed by hypothermia in aged rats may, in the long term, rebound, and diminish the beneficial effects.
authors.affiliation: University of Medicine and Pharmacy, Craiova, Romania.
authors.forename: Raluca Elena
authors.initials: RE
authors.lastname: Sandu
authors.affiliation: University of Medicine and Pharmacy, Craiova, Romania.
authors.forename: Ana-Maria
authors.initials: AM
authors.lastname: Buga
authors.affiliation: University of Medicine and Pharmacy, Craiova, Romania.
authors.forename: Adrian Tudor
authors.initials: AT
authors.lastname: Balseanu
authors.affiliation: Division of Physiology and Fundamental Neuroscience, "Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania; Neuroscience and Pharmacology, Panum, University of Copenhagen, Copenhagen, Denmark.
authors.forename: Mihai
authors.initials: M
authors.lastname: Moldovan
authors.affiliation: University of Medicine and Pharmacy, Craiova, Romania; Department of Psychiatry, Aging & Psychiatric Disorders Group, University of Medicine Rostock, Germany. Electronic address: aurel.popa-wagner@med.uni-rostock.de.
authors.forename: Aurel
authors.initials: A
authors.lastname: Popa-Wagner
mesh_terms: D000375:Aging; D000818:Animals; D020520:Brain Infarction / Q000517:prevention & control*; D004569:Electroencephalography; D004660:Encephalitis / Q000517:prevention & control*; D005740:Gases; D006862:Hydrogen Sulfide; D007036:Hypothermia, Induced; D008297:Male; D055495:Neurogenesis; D017207:Rats, Sprague-Dawley; D012307:Risk Factors; D012890:Sleep / Q000502:physiology; D013997:Time Factors
chemical_list: D005740:Gases; D006862:Hydrogen Sulfide
keywords: Aging; EEG; H(2)S; Hypothermia; Inflammation; Neurogenesis; Neuroprotection; Phagocytosis; Sleep; Stroke