title: Mechanism of subdural effusion evolves into chronic subdural hematoma: IL-8 inducing neutrophil oxidative burst.
abstract: Chronic subdural hematoma (CSDH) is still a mysterious disease. Though great success has been has achieved by neuro-surgery treatment, the origin and development of CSDH remains unknown. Tremendous clinical observations have found the correlation of subdural effusion (SDE) and CSDH. However, systematic elucidation of CSDH's origin and progression is lacking while almost all the current hypothesis only explained partial phenomenon. This hypothesis proposes Interleukin (IL)-8 inducing neutrophil respiratory burst is the crucial impact when SDE evolves into CSDH. IL-8 initially secreted by dural border layer cells, accumulates and the concentration of IL-8 rises in the SDE cavity. Accompanied by the formation of neo-membrane under the dura meninges, IL-8 firstly prompts to establish the neo-vasculature in it, and then attracts lymphocytes aggregation in the neo-membrane. Both the newly recruited lymphocytes and endothelial cells assist the further elevation of local IL-8 concentration. When the IL-8 concentration elevated to a particular level, it attracts neutrophils to the inner wall of neo-vessels and primes them to oxidative burst. Lysosomes and superoxide released by these neutrophils make the fragile neo-capillary became leaky, and subsequently the plasma and blood cells run into SDE. However, as long as the erythrocytes come into the cavity, they shall bind large quantity of IL-8 and decrease IL-8 concentration to a lower level relatively that reduce the neutrophils recruit. When this negative feedback is stagnancy, for example, the SDE space is so large in elder man who is experiencing brain atrophy, the neo-vessels have to release more erythrocytes to bind IL-8, the liquid cavity will expand and the high intracranial pressure symptoms appeared. Our hypothesis holds potential for the proper therapeutic intervention of CSDH. IL-8 antagonist and other anti-inflammation drugs like macrolides antibiotics, glucocorticoid and atorvastatin might be optional to resist the liquid cavity expanding as actually occurs obvious bleeding soon.
authors.affiliation: Department of Neurosurgery, Yiwu Central Hospital, Wenzhou Medical College, Yiwu 32200, Zhejiang Province, People's Republic of China. Electronic address: 266181@163.com.
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Tao
authors.affiliation: Department of Neurosurgery, Renji Hospital, School of Medicine, Shanghai Jiao-Tong University, No. 1630, Dongfang Road, Pudong New District, Shanghai 200127, People's Republic of China.
authors.forename: Yingying
authors.initials: Y
authors.lastname: Lin
authors.affiliation: Department of Neurosurgery, Yiwu Central Hospital, Wenzhou Medical College, Yiwu 32200, Zhejiang Province, People's Republic of China.
authors.forename: Maotong
authors.initials: M
authors.lastname: Hu
authors.affiliation: Department of Neurosurgery, Yiwu Central Hospital, Wenzhou Medical College, Yiwu 32200, Zhejiang Province, People's Republic of China.
authors.forename: Shenghong
authors.initials: S
authors.lastname: Ding
authors.affiliation: Department of Neurosurgery, Yiwu Central Hospital, Wenzhou Medical College, Yiwu 32200, Zhejiang Province, People's Republic of China.
authors.forename: Jianwei
authors.initials: J
authors.lastname: Li
authors.affiliation: Department of Neurosurgery, Renji Hospital, School of Medicine, Shanghai Jiao-Tong University, No. 1630, Dongfang Road, Pudong New District, Shanghai 200127, People's Republic of China.
authors.forename: Yongming
authors.initials: Y
authors.lastname: Qiu
mesh_terms: D000818:Animals; D004194:Disease; D019317:Evidence-Based Medicine; D020200:Hematoma, Subdural, Chronic / Q000209:etiology / Q000276:immunology*; D006801:Humans; D016209:Interleukin-8 / Q000276:immunology*; D008955:Models, Cardiovascular; D018448:Models, Immunological; D009504:Neutrophils / Q000276:immunology*; D016897:Respiratory Burst / Q000276:immunology*; D013353:Subdural Effusion / Q000150:complications / Q000276:immunology*
chemical_list: D016209:Interleukin-8