TY - JOUR
T1 - Dose-dependent induction of mRNAs encoding brain-derived neurotrophic factor and heat-shock protein-72 after cortical spreading depression in the rat
AU - Rangel, Yolanda M.
AU - Karikó, Katalin
AU - Harris, Valerie A.
AU - Duvall, Monica E.
AU - Welsh, Frank A.
N1 - Funding Information:
We would like to thank Dr. Joel Greenberg for his advice and helpful suggestions in manuscript preparation. We gratefully acknowledge Jason M. Keller for his excellent critical revision of the manuscript. National Institutes of Health grants NS29331, NS08803 and EY06644 supported this study.
PY - 2001/3/31
Y1 - 2001/3/31
N2 - Previous studies have demonstrated that cortical spreading depression (CSD) increases the expression of putative neuroprotective proteins. The objective of the present study was to elucidate the relationship between the number of episodes of CSD and steady-state levels of mRNAs encoding brain-derived neurotrophic factor (BDNF), heat-shock protein-72 (hsp72) and c-fos. Wistar rats were administered one, five, or twenty-five episodes of CSD evoked by application of 2 M KCl to the frontal cortex of one hemisphere. Animals were permitted to recover for 30 min, 2 h or 24 h prior to sacrifice. Total RNA was isolated from the parietal cortex of each hemisphere and analyzed using Northern blots. At 30 min recovery, levels of BDNF mRNA were not significantly elevated after 1 episode of CSD, but were increased 4-fold after five episodes of CSD and 11-fold after twenty-five episodes of CSD, relative to levels in the contralateral hemisphere. At 2 h recovery, BDNF mRNA levels increased 2-, 3- and 9-fold, respectively. At 24 h, BDNF mRNA had returned to control levels in all groups. Thus, CSD increased levels of BDNF mRNA in a dose-dependent fashion at the early recovery times. Hsp72 mRNA was below the level of detection after 1 and 5 episodes of CSD. However, after twenty-five episodes of CSD, hsp72 mRNA levels were increased in the ipsilateral hemisphere at 30 min and 2 h recovery. Unlike levels of BDNF and hsp72 mRNA, levels of c-fos mRNA were increased nearly to the same extent at 30 min and 2 h after one, five or twenty-five episodes of CSD before returning to control by 24 h recovery. These results demonstrate that CSD triggers a dose-dependent increase in the expression of genes encoding neuroprotective proteins, which may mediate tolerance to ischemia induced by CSD.
AB - Previous studies have demonstrated that cortical spreading depression (CSD) increases the expression of putative neuroprotective proteins. The objective of the present study was to elucidate the relationship between the number of episodes of CSD and steady-state levels of mRNAs encoding brain-derived neurotrophic factor (BDNF), heat-shock protein-72 (hsp72) and c-fos. Wistar rats were administered one, five, or twenty-five episodes of CSD evoked by application of 2 M KCl to the frontal cortex of one hemisphere. Animals were permitted to recover for 30 min, 2 h or 24 h prior to sacrifice. Total RNA was isolated from the parietal cortex of each hemisphere and analyzed using Northern blots. At 30 min recovery, levels of BDNF mRNA were not significantly elevated after 1 episode of CSD, but were increased 4-fold after five episodes of CSD and 11-fold after twenty-five episodes of CSD, relative to levels in the contralateral hemisphere. At 2 h recovery, BDNF mRNA levels increased 2-, 3- and 9-fold, respectively. At 24 h, BDNF mRNA had returned to control levels in all groups. Thus, CSD increased levels of BDNF mRNA in a dose-dependent fashion at the early recovery times. Hsp72 mRNA was below the level of detection after 1 and 5 episodes of CSD. However, after twenty-five episodes of CSD, hsp72 mRNA levels were increased in the ipsilateral hemisphere at 30 min and 2 h recovery. Unlike levels of BDNF and hsp72 mRNA, levels of c-fos mRNA were increased nearly to the same extent at 30 min and 2 h after one, five or twenty-five episodes of CSD before returning to control by 24 h recovery. These results demonstrate that CSD triggers a dose-dependent increase in the expression of genes encoding neuroprotective proteins, which may mediate tolerance to ischemia induced by CSD.
KW - Brain-derived neurotrophic factor
KW - Cortical spreading depression
KW - Heat-shock protein-72
KW - Tolerance to ischemia
KW - c-Fos
UR - http://www.scopus.com/inward/record.url?scp=0035977976&partnerID=8YFLogxK
U2 - 10.1016/S0169-328X(01)00037-7
DO - 10.1016/S0169-328X(01)00037-7
M3 - Article
C2 - 11295236
AN - SCOPUS:0035977976
VL - 88
SP - 103
EP - 112
JO - Molecular Brain Research
JF - Molecular Brain Research
SN - 0169-328X
IS - 1-2
ER -