Role of matrix metalloproteinase-9 in apoptosis of hippocampal neurons in rats during early brain injury after subarachnoid hemorrhage (original) (raw)

Abstract

This study investigated the possible involvement of matrix metalloproteinase 9 (MMP-9) in early brain injury (EBI) of subarachnoid hemorrhage (SAH) in rats. MMP-9 activities in hippocampus were examined at 6, 12, 24, 48 and 72 h after SAH. Laminin was detected by immunohistochemistry. Apoptosis of neurons in hippocampus was observed by TUNEL. Brain water content was also examined. MMP-9 activity and the number of apoptotic neurons increased from 12 to 72 h with a peak at 24 h. Laminin was found to decrease at 12 h, reached minimum at 24 h and began to increase from 48 h, which had a negative correlation with apoptotic neurons. The changes of brain water content were found to be coincidence with that of neuronal apoptosis. Our findings suggest that MMP-9 is probably involved in the pathophysiological events of EBI after SAH, through degrading laminin which leads to neuronal anoikis of hippocampus.

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Acknowledgments

This research was supported in part by the Foundation for Excellent Doctoral Dissertation of Chongqing Medical University (0200101174). The authors are appreciative of John H. Zhang from Loma Linda University Medical Centre for his helpful discussions in conducting this study.

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Authors and Affiliations

  1. Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, 400016, Chongqing, People’s Republic of China
    Zongduo Guo, Xiaochuan Sun, Zhaohui He & Xiaodong Zhang
  2. Department of Neurosurgery, The First Affiliated Hospital of Luzhou Medical College, 646000, Luzhou, People’s Republic of China
    Yong Jiang

Authors

  1. Zongduo Guo
  2. Xiaochuan Sun
  3. Zhaohui He
  4. Yong Jiang
  5. Xiaodong Zhang

Corresponding author

Correspondence toXiaochuan Sun.

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Guo, Z., Sun, X., He, Z. et al. Role of matrix metalloproteinase-9 in apoptosis of hippocampal neurons in rats during early brain injury after subarachnoid hemorrhage.Neurol Sci 31, 143–149 (2010). https://doi.org/10.1007/s10072-009-0192-x

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