Rats, Mutant Strains

Publication Title: 
The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences

The discovery that in invertebrates, disruption of the insulin/insulin-like growth factor (IGF)-1 pathway extends life span and increases resistance to oxidative injury led to the hypothesis that IGF-1 signaling may play a role in regulating cellular reactive oxygen species production, oxidative stress resistance, and consequentially, organismal life span in mammals. However, previous studies testing this hypothesis in rodent models of IGF-1 deficiency yielded controversial results.

Author(s): 
Ungvari, Zoltan
Sosnowska, Danuta
Podlutsky, Andrej
Koncz, Peter
Sonntag, William E.
Csiszar, Anna
Publication Title: 
The Journal of Neuroscience: The Official Journal of the Society for Neuroscience

The Long-Evans shaker (les) rat has a mutation in myelin basic protein that results in severe CNS dysmyelination and subsequent demyelination during development. During this time, les oligodendrocytes accumulate cytoplasmic vesicles, including lysosomes and membrane-bound organelles. However, the mechanism and functional relevance behind these oligodendrocyte abnormalities in les have not been investigated. Using high-magnification electron microscopy, we identified the accumulations in les oligodendrocytes as early and late autophagosomes.

Author(s): 
Smith, Chelsey M.
Mayer, Joshua A.
Duncan, Ian D.
Publication Title: 
Hypertension

The association of hypertension with obesity has long been recognized; however, because of the lack of suitable animal models of obesity and hypertension, the pathogenesis of the high blood pressure associated with obesity remains poorly understood. We hypothesized that the Zucker fatty rat, a widely studied model of obesity and insulin resistance, might also be characterized by hypertension.

Author(s): 
Kurtz, T. W.
Morris, R. C.
Pershadsingh, H. A.
Publication Title: 
Journal of Applied Physiology (Bethesda, Md.: 1985)

We hypothesized that a polycystic ovary syndrome (PCOS) background associated with obese-prone genotype, coupled with preconditioning by caloric restriction, would confer a survival benefit in genetically prepubertal obese/PCOS (O/PCOS)-prone rats faced with an unpredictable challenge of food shortage. Female, juvenile JCR:LA-cp rats, O/PCOS- and lean-prone, were exposed to 1.5 h of daily meals and 22.5 h of voluntary wheel-running, a procedure that leads to activity anorexia (AA).

Author(s): 
Diane, Abdoulaye
Vine, Donna F.
Heth, C. Donald
Russell, James C.
Proctor, Spencer D.
Pierce, W. David
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