2013 Fiscal Year Final Research Report
Not only angiogenesis but also inflammation participate in the pathophysiology of brain radiation necrosis
| Project/Area Number |
24659658
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Cerebral neurosurgery
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| Research Institution | Osaka Medical College |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
SASAKI Ryohei 神戸大学, 医学部, 教授 (30346267)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | 脳放射線壊死 / ＶＥＧＦ / bevacizumab / 炎症 / 虚血 |
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| Research Abstract |
Surgical specimens of symptomatic RN in the brain were retrospectively reviewed by histological and immunohistochemical analyses using hematoxylin and eosin (H&E) staining as well as immunohistochemical staining.The most prominent vasculature was identified as thin-walled leaky angiogenesis, i.e., telangiectasis surrounded by prominent interstitial edema.Two major cell phenotypes infiltrated the perinecrotic area: GFAP-positive reactive astrocytes and CD68/hGLUT-5-positive cells (mainly microglias). VEGF caused leaky angiogenesis followed by perilesional edema in RN. GFAP-positive cells expressing CXCL12 might attract CXCR4-expressing CD68/hGLUT5-positive cells into the perinecrotic area. These accumulated CD68/hGLUT5-positive cells expressing pro-inflammatory cytokines seemed to aggravate the RN edema. Both angiogenesis and inflammation might be caused by the regulation of HIF-1a, which is well known as a transactivator of VEGF and of the CXCL12/CXCR4 chemokine axis.
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