title: Disease progression in a mouse model of amyotrophic lateral sclerosis: the influence of chronic stress and corticosterone.
abstract: Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease characterized by motor neuron cell loss, muscular atrophy, and a shortened life span. Survival is highly variable, as some patients die within months, while others live for many years. Exposure to stress or the development of a nonoptimal stress response to disease might account for some of this variability. We show in the SOD1(G93A) mouse model of ALS that recurrent exposure to restraint stress led to an earlier onset of astrogliosis and microglial activation within the spinal cord, accelerated muscular weakness, and a significant decrease in median survival (105 vs. 122 d) when compared to nonstressed animals. Moreover, during normal disease course, ALS mice display a cacostatic stress response by developing an aberrant serum corticosterone circadian rhythm. Interestingly, we also found that higher corticosterone levels were significantly correlated with both an earlier onset of paralysis (males: r(2)=0.746; females: r(2)=0.707) and shorter survival times (males: r(2)=0.680; females: r(2)=0.552) in ALS mice. These results suggest that stress is capable of accelerating disease progression and that strategies that modulate glucocorticoid metabolism might be a viable treatment approach for ALS.
authors.affiliation: Genzyme Corporation, 49 New York Ave., Framingham, MA 01701-9322, USA.
authors.forename: Jonathan A
authors.initials: JA
authors.lastname: Fidler
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Treleaven
authors.forename: Ashley
authors.initials: A
authors.lastname: Frakes
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Tamsett
authors.forename: Mary
authors.initials: M
authors.lastname: McCrate
authors.forename: Seng H
authors.initials: SH
authors.lastname: Cheng
authors.forename: Lamya S
authors.initials: LS
authors.lastname: Shihabuddin
authors.forename: Brian K
authors.initials: BK
authors.lastname: Kaspar
authors.forename: James C
authors.initials: JC
authors.lastname: Dodge
mesh_terms: D000690:Amyotrophic Lateral Sclerosis / Q000209:etiology* / Q000235:genetics / Q000378:metabolism; D000818:Animals; D003345:Corticosterone / Q000097:blood / Q000378:metabolism* / Q000494:pharmacology; D004195:Disease Models, Animal; D018450:Disease Progression; D005260:Female; D006801:Humans; D008297:Male; D051379:Mice; D008817:Mice, Mutant Strains; D008822:Mice, Transgenic; D008954:Models, Biological; D050505:Mutant Proteins / Q000235:genetics / Q000378:metabolism; D012149:Restraint, Physical / Q000009:adverse effects; D013312:Stress, Physiological; D013482:Superoxide Dismutase / Q000235:genetics / Q000378:metabolism
chemical_list: D050505:Mutant Proteins; C109415:SOD1 G93A protein; D013482:Superoxide Dismutase; D003345:Corticosterone