Abstract
Background
Delayed deterioration associated with vasospasm (DDAV) after aneurismal subarachnoid hemorrhage (SAH) is a major cause of morbidity. We have previously shown that myeloid cell depletion before experimental SAH in a murine model ameliorates DDAV. In this study, we address whether systemic administration of lipopolysaccharide (LPS) worsens DDAV in a myeloid cell-dependent fashion.
Methods
We challenged mice in our experimental SAH model with LPS before hemorrhage and evaluated the degree of vasospasm on day 6 with India ink angiography; behavioral deficits by rotorod, Y-maze, and Barnes maze testing; microglial activation early after SAH by immunohistochemistry; and the brain levels of the chemokines CCL5 and KC at the time of vasospasm. Another group of animals were given the myeloid cell-depleting antibody against the neutrophil antigen Ly6G/C prior to LPS administration and SAH.
Results
LPS followed by SAH significantly worsens angiographic vasospasm as well as performance on the Barnes maze but not the Y-maze or rotorod tests. There was an increased activation of microglia in animals with LPS before SAH compared to SAH alone. Depletion of myeloid cells before LPS administration inhibited the development of vasospasm, improved the performance on behavioral tests, and reduced microglial activation. The chemokines CCL5 and KC were incrementally elevated in SAH and LPS SAH, but suppressed in animals with myeloid cell depletion.
Conclusions
LPS administration before SAH worsens DDAV through a myeloid cell-dependent mechanism supporting studies in humans which show that systemic inflammation increases the likelihood of developing DDAV.
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Acknowledgments
The authors would like to thank James Bena for the statistical assistance. This work was supported by a grant from the NIH (K08-NS051350 JJP) and the Cleveland Clinic Cerebrovascular Center (Institutional Support JJP).
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The authors declared that they have no conflicts of interest.
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Smithason, S., Moore, S.K. & Provencio, J.J. Systemic Administration of LPS Worsens Delayed Deterioration Associated with Vasospasm After Subarachnoid Hemorrhage Through a Myeloid Cell-Dependent Mechanism. Neurocrit Care 16, 327–334 (2012). https://doi.org/10.1007/s12028-011-9651-3
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DOI: https://doi.org/10.1007/s12028-011-9651-3