Department of Surgery, Division of Traumatology, Surgical Critical Care and Emergency Surgery, Perelman School of Medicine at the University of Pennsylvania, The Trauma Center at Penn, 3400 Spruce Street, Maloney Building, 5th Floor, Philadelphia, PA 19104, USA.
Am J Surg. 2013 Dec;206(6):840-5; discussion 845-6. doi: 10.1016/j.amjsurg.2013.07.016. Epub 2013 Oct 7.
Progesterone (PRO) may confer a survival advantage in traumatic brain injury (TBI) by reducing cerebral edema. We hypothesized that PRO reduces edema by blocking polymorphonuclear (PMN) interactions with endothelium (EC) in the blood-brain barrier (BBB).
CD1 mice received repeated PRO (16 mg/kg intraperitoneally) or vehicle (cyclodextrin) for 36 hours after TBI. Sham animals underwent craniotomy without TBI. The modified Neurological Severity Score graded neurologic recovery. A second craniotomy allowed in vivo observation of pial EC/PMN interactions and vascular macromolecule leakage. Wet/dry ratios assessed cerebral edema.
Compared with the vehicle, PRO reduced subjective cerebral swelling (2.9 ± .1 vs 1.2 ± .1, P < .001), PMN rolling (95 ± 1.8 vs 57 ± 2.0 cells/100 μm/min, P < .001), total EC/PMN adhesion (2.0 ± .4 vs .8 ± .1 PMN/100 μm, P < .01), and vascular permeability (51.8% ± 4.9% vs 27.1% ± 4.6%, P < .01). TBI groups had similar a Neurological Severity Score and cerebral wet/dry ratios (P > .05).
PRO reduces live pericontusional EC/PMN and BBB macromolecular leakage after TBI. Direct PRO effects on the microcirculation warrant further investigation.
孕酮(PRO)通过减少脑水肿可能在创伤性脑损伤(TBI)中提供生存优势。我们假设 PRO 通过阻断多形核(PMN)与血脑屏障(BBB)内皮细胞(EC)的相互作用来减少水肿。
CD1 小鼠在 TBI 后接受重复 PRO(16 mg/kg 腹腔内)或载体(环糊精)治疗 36 小时。假手术动物接受颅骨切开术而不进行 TBI。改良神经严重程度评分对神经恢复进行分级。第二次颅骨切开术允许在体内观察脑膜 EC/PMN 相互作用和血管大分子渗漏。干湿比评估脑水肿。
与载体相比,PRO 减少了主观脑肿胀(2.9 ±.1 对 1.2 ±.1,P <.001)、PMN 滚动(95 ± 1.8 对 57 ± 2.0 细胞/100 μm/min,P <.001)、总 EC/PMN 粘附(2.0 ±.4 对.8 ±.1 PMN/100 μm,P <.01)和血管通透性(51.8% ± 4.9% 对 27.1% ± 4.6%,P <.01)。TBI 组的神经严重程度评分和脑干湿比相似(P >.05)。
PRO 减少 TBI 后活的periocontusional EC/PMN 和 BBB 大分子渗漏。PRO 对微循环的直接作用值得进一步研究。