经头皮-颅骨-硬膜界面调控小鼠脑出血后脑损伤
该研究用胶原酶诱导雄性C57BL/6J小鼠脑出血，通过单细胞RNA测序、流式细胞术和细胞示踪比较颅骨骨髓与股骨骨髓的免疫应答。结果显示颅骨骨髓中性粒细胞具有更强的促炎和迁移特征，并优先迁移至硬膜和脑实质。经头皮下给予CXCR2拮抗剂或硬膜给予抗CCL3抗体均可减少脑内中性粒细胞浸润并减轻脑损伤。
要点
- 颅骨骨髓可能是脑出血后致病性中性粒细胞的主要来源。
- 经头皮-颅骨-硬膜界面给药可减少脑内中性粒细胞浸润并改善神经功能。
- 硬膜中性粒细胞CCL3上调参与颅骨骨髓中性粒细胞活化。
核心结论
- 颅骨骨髓可能是驱动脑出血后神经炎症的致病性中性粒细胞主要来源。
- 经头皮-颅骨-硬膜界面靶向该免疫区室是减轻脑出血后脑损伤的可及策略。
研究设计与样本
- 用胶原酶注射诱导雄性C57BL/6J小鼠脑出血模型。
- 对假手术和脑出血小鼠行单细胞RNA测序比较颅骨骨髓与股骨骨髓免疫格局。
- 用流式细胞术结合细胞示踪实验评估中性粒细胞在颅骨骨髓、硬膜和脑内的时间依赖性聚集。
- 经头皮下给予CXCR2拮抗剂SB225002以验证颅骨骨髓来源中性粒细胞迁移的作用。
- 经硬膜给予抗CCL3中和抗体以确定硬膜CCL3在颅骨骨髓中性粒细胞活化中的作用。
主要发现
- 脑出血使颅骨骨髓和股骨骨髓的造血均向髓系偏移，但颅骨骨髓中性粒细胞表现出更强的促炎和迁移基因特征。
- 颅骨来源中性粒细胞在脑出血后优先迁移至硬膜和脑实质。
- 头皮下给予SB225002减少中性粒细胞浸润，减轻脑水肿和血脑屏障破坏，并改善短期和长期神经功能缺损。
- 脑出血后硬膜中性粒细胞CCL3特异性上调。
- 硬膜给予抗CCL3抗体显著减少脑内中性粒细胞聚集并减轻脑出血后脑损伤，同时抑制颅骨骨髓而非股骨骨髓中的中性粒细胞活化。
关键数值与推荐
- 结局评估包括行为缺损、脑水肿、血脑屏障完整性、血肿清除和脑内中性粒细胞浸润。
临床怎么用
- 经头皮-颅骨-硬膜界面靶向颅骨骨髓来源中性粒细胞可能是脑出血后减轻继发性脑损伤的潜在治疗方向。
局限性
- 该研究仅使用雄性C57BL/6J小鼠，未包含雌性或其他品系动物。
以上解读依据论文摘要（全文未开放获取或许可不允许翻译转载）。
原文
Stroke, Volume 57, Issue 10, Page 3124-3133, October 1, 2026. BACKGROUND:Neuroinflammation critically contributes to secondary brain injury after intracerebral hemorrhage (ICH). The skull-dura interface allows immune trafficking from skull bone marrow (SBM) to the brain, but its role in ICH remains unclear.METHODS:ICH was induced in male C57BL/6J mice by collagenase injection. To compare the immune landscape of SBM and femur bone marrow (FBM), single-cell RNA sequencing was performed on sham-operated and ICH mice. Flow cytometry at serial time points, combined with cell-tracking experiments, was used to assess time-dependent neutrophil accumulation in SBM, dura, and brain, as well as the relative contribution of SBM- versus FBM-derived neutrophils after ICH. To test whether SBM-derived neutrophil migration contributes to neuroinflammation, the CXCR2 (C-X-C motif chemokine receptor 2) antagonist SB225002 was delivered subscalp. Finally, dural delivery of anti-CCL3 (C-C motif chemokine ligand 3) neutralizing antibodies was performed to determine the role of dural CCL3 in SBM neutrophil priming. Outcomes included evaluations of behavioral deficits, brain edema, integrity of the blood-brain barrier, hematoma removal, and brain neutrophil infiltration.RESULTS:Single-cell RNA sequencing revealed that ICH shifted hematopoiesis toward the myeloid lineage in both SBM and FBM; however, SBM neutrophils exhibited significantly stronger proinflammatory and migratory gene signatures than FBM neutrophils. Skull-derived neutrophils preferentially migrated to the dura and brain parenchyma post-ICH. Subscalp delivery of SB225002 reduced neutrophil infiltration, attenuated brain edema and blood-brain barrier disruption, and improved short-term and long-term neurological deficits. In addition, CCL3 was specifically upregulated in dural neutrophils after ICH. Unexpectedly, dural delivery of an anti-CCL3 antibody markedly reduced neutrophil accumulation in the brain and protected against ICH-induced brain injury, accompanied by inhibition of neutrophil activation in SBM but not in FBM.CONCLUSIONS:SBM may serve as a primary source of pathogenic neutrophils driving neuroinflammation after ICH. Targeting this immune compartment through the scalp-skull-dura interface represents an accessible strategy for mitigating ICH-induced brain injury.
引用
- Stroke：Modulation of Brain Injury After Intracerebral Hemorrhage via the Scalp-Skull-Dura Interface in Mice
供执业医师工作参考，不替代临床判断；数值与分级以指南原文为准。