Abstract
Objective
Adhesion molecules, including intercellular adhesion molecule-1 (ICAM-1), vascular cell adhesion molecule-1 (VCAM-1), and E-selectin, are important inflammatory mediators which are elevated in the serum of patients following aneurysmal subarachnoid hemorrhage (SAH). The authors previously found that 6-mercaptopurine (6-mp) was effective in preventing and reversing arterial narrowing in a rodent SAH model. The present study was to examine whether levels of adhesion molecules were altered after treatment with 6-mp in this animal model.
Materials and methods
Animals were each injected with autologous blood into the cisterna magna, and intraperitoneal treatment with 6-mp (2 mg/kg) was initiated 1 h before (prevention) or later (treatment). The compound was subsequently administered at 24 and 48 h post-SAH. Blood samples were collected at 72 h post-SAH to measure ICAM-1, VCAM-1, and E-selectin levels. The basilar arteries were harvested and sliced, and their cross-sectional areas were measured. Morphologically, convolution of the internal elastic lamina, distorted endothelial wall, and myonecrosis of the smooth muscle were prominently observed in the SAH only and vehicle-treated SAH groups, but not in the 6-mp-treated SAH group or in healthy controls. No significant differences were found in the levels of VCAM-1 among all groups. However, the levels of E-selectin were increased in all animals subjected to SAH (SAH only and SAH plus vehicle groups) compared with healthy controls (no SAH), but not in the 6-mp group (SAH plus 6-mp treatment and preventive treatment with 6-mp).Likewise, the levels of ICAM-1 in the SAH only and SAH plus vehicle groups were significantly elevated (p < 0.001), and pretreatment and treatment with 6-mp reduced ICAM-1 to control levels.
Conclusion
These results show that ICAM-1 and E-selectin may play a role in mediating SAH-induced vasospasm and that a reduction of both adhesive molecules after SAH may partly contribute to the antispastic effect of 6-mp.
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Abbreviations
- BA:
-
Basilar artery
- ICAM-1:
-
Intercellular adhesion molecule-1
- IEL:
-
Internal elastic lamina
- PBS:
-
Phosphate-buffered saline
- PECAM:
-
Platelet-endothelial adhesion molecule
- SAH:
-
Subarachnoid hemorrhage
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CZC and ALK contributed equally to this work.
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The authors have carefully built an animal study trying to find out the effects 6-mp may have in the levels of adhesion molecules resulting from the inflammation associated with SAH and vasospasm. Their results seem to demonstrate that when 6-mp is administered to rats prior or immediately after SAH, the levels of two of the three tested adhesion molecules (ICAM-1 and E-Selectin) are diminished. No explanation is given as to why no effect was found with VCAM-1.
This is yet another laboratory study pursuing the key to the resilient latch of SAH. Since inflammation is likely to play a determinant role in the process of vasospasm, results from studies such as these may prove to be rather important in the design of drugs designed to fight this treacherous complication of SAH. The effort is to be commended and we wait for further developments
Manuel Cunha e Sá, M.D.
Lisbon, Portugal
This is an interesting paper adding another valuable piece of information on the role of inflammation in the pathogenesis of post-SAH vasospasm. Given the validity of the model, the soundness of results, and the long-lasting expertise of the senior author in this field, I recommend the authors to produce more experimental work in this setting.
Domenico d’Avella
Padova, Italy
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Chang, CZ., Lin, CL., Kassel, N.F. et al. 6-Mercaptopurine attenuates adhesive molecules in experimental vasospasm. Acta Neurochir 152, 861–867 (2010). https://doi.org/10.1007/s00701-010-0602-0
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DOI: https://doi.org/10.1007/s00701-010-0602-0