Our laboratory previously found that protein-energy malnutrition (PEM) existing prior to brain ischemia impaired functional outcome measured in an open field test, and one-third of animals showed a marked increase in reactive gliosis. It was hypothesized that PEM worsened stroke outcome by increasing inflammation via increased activation of the transcription factor, nuclear factor kappa B (NFκB). Mongolian gerbils (11-12 wk old) were randomly assigned to a control diet (12.5% protein) or a protein-deficient diet (2%) for 28 days. The control group on average gained 4.9g and the PEM group lost 7.4g. PEM gerbils had significantly decreased food intake (P<0.001; unpaired t-test). Animals were then subjected to global ischemia or sham surgery, resulting in four experimental groups. Global ischemia was achieved by a 5 min bilateral common carotid artery occlusion with tympanic temperature regulated at 36.5 ± 0.2C. PEM independently increased hippocampal NFκB activation by three times higher than control diet animals at 6hr after surgery (p=0.014; 2-factor ANOVA) detected by electrophoretic mobility shift assay (EMSA). There was no significant effect of ischemia on NFκB activation and there was no interaction of diet and ischemia. Serum glucose and serum cortisol were also measured since both variables can be affected by PEM and can influence stroke outcome, but there was no significant effect of diet or ischemia. Because of the increased NFκB activation observed in PEM-Sham animals, a second experiment investigated if PEM also increased NFκB activation in the absence of surgery. Gerbils of the same age were randomly assigned to either control diet or PEM for 28 days but did not receive any surgery. PEM consistently increased NFκB activation. Since PEM exists in 16% of elderly stroke patients at admission, the data suggest that PEM may worsen stroke outcome through increased activation of NFκB. Because increased NFκB activation was also observed in PEM independent of ischemia, the data also have implications for the inflammatory response of protein-energy malnourished elderly in general.
| Identifer | oai:union.ndltd.org:USASK/oai:usask.ca:etd-12082006-104640 |
| Date | 11 December 2006 |
| Creators | Ji, Liang |
| Contributors | Nazarali, Adil J., Bandy, Brian, Paterson, Phyllis G. |
| Publisher | University of Saskatchewan |
| Source Sets | University of Saskatchewan Library |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://library.usask.ca/theses/available/etd-12082006-104640/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to University of Saskatchewan or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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