LRP1 activation attenuates white matter injury by modulating microglial polarization through Shc1/PI3K/Akt pathway after subarachnoid hemorrhage in rats
Jianhua Peng,
Jinwei Pang,
Lei Huang,
Budbazar Enkhjargal,
Tongyu Zhang,
Jun Mo,
Pei Wu,
Weilin Xu,
Yuchun Zuo,
Jun Peng,
Gang Zuo,
Ligang Chen,
Jiping Tang,
John H. Zhang,
Yong Jiang
Affiliations
Jianhua Peng
Department of Neurosurgery, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China; Department of Physiology and Pharmacology, Loma Linda University, Loma Linda, CA 92350, USA
Jinwei Pang
Department of Neurosurgery, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China; Department of Physiology and Pharmacology, Loma Linda University, Loma Linda, CA 92350, USA
Lei Huang
Department of Physiology and Pharmacology, Loma Linda University, Loma Linda, CA 92350, USA
Budbazar Enkhjargal
Department of Physiology and Pharmacology, Loma Linda University, Loma Linda, CA 92350, USA
Tongyu Zhang
Department of Physiology and Pharmacology, Loma Linda University, Loma Linda, CA 92350, USA
Jun Mo
Department of Physiology and Pharmacology, Loma Linda University, Loma Linda, CA 92350, USA
Pei Wu
Department of Physiology and Pharmacology, Loma Linda University, Loma Linda, CA 92350, USA
Weilin Xu
Department of Physiology and Pharmacology, Loma Linda University, Loma Linda, CA 92350, USA
Yuchun Zuo
Department of Physiology and Pharmacology, Loma Linda University, Loma Linda, CA 92350, USA
Jun Peng
Department of Physiology and Pharmacology, Loma Linda University, Loma Linda, CA 92350, USA
Gang Zuo
Department of Physiology and Pharmacology, Loma Linda University, Loma Linda, CA 92350, USA
Ligang Chen
Department of Neurosurgery, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China
Jiping Tang
Department of Physiology and Pharmacology, Loma Linda University, Loma Linda, CA 92350, USA
John H. Zhang
Department of Physiology and Pharmacology, Loma Linda University, Loma Linda, CA 92350, USA; Department of Anesthesiology, Loma Linda University, Loma Linda, CA 92350, USA; Department of Neurosurgery, Loma Linda University, Loma Linda, CA 92350, USA; Correspondence to: Department of Physiology and Pharmacology, Loma Linda University, School of Medicine, Risley Hall, Room 219, 11041 Campus St, Loma Linda, CA 92354, USA.
Yong Jiang
Department of Neurosurgery, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China; Neurosurgery Clinical Medical Research Center of Sichuan Province, Luzhou, Sichuan 646000, China; Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Luzhou, Sichuan 646000, China; Corresponding author at: Department of Neurosurgery, The Affiliated Hospital of Southwest Medical University, NO.25 of Taiping Street, Luzhou, Sichuan 646000, China.
White matter injury (WMI) is associated with motor deficits and cognitive dysfunctions in subarachnoid hemorrhage (SAH) patients. Therapeutic strategy targeting WMI would likely improve the neurological outcomes after SAH. Low-density lipoprotein receptor-related protein-1 (LRP1), a scavenger receptor of apolipoprotein E (apoE), is able to modulate microglia polarization towards anti-inflammatory M2 phenotypes during inflammatory and oxidative insult. In the present study, we investigated the effects of LRP1 activation on WMI and underlying mechanisms of M2 microglial polarization in a rat model of SAH. Two hundred and seventeen male Sprague Dawley rats (weight 280–330 g) were used. SAH was induced by endovascular perforation. LPR1 ligand, apoE-mimic peptide COG1410 was administered intraperitoneally. Microglial depletion kit liposomal clodronate (CLP), LPR1 siRNA or PI3K inhibitor were administered intracerebroventricularly. Post-SAH assessments included neurobehavioral tests, brain water content, immunohistochemistry, Golgi staining, western blot and co-immunoprecipitation. SAH induced WMI shown as the accumulation of amyloid precursor protein and neurofilament heavy polypeptide as well as myelin loss. Microglial depletion by CLP significantly suppressed WMI after SAH. COG1410 reduced brain water content, increased the anti-inflammatory M2 microglial phenotypes, attenuated WMI and improved neurological function after SAH. LRP1 was bound with endogenous apoE and intracellular adaptor protein Shc1. The benefits of COG1410 were reversed by LPR1 siRNA or PI3K inhibitor. LRP1 activation attenuated WMI and improved neurological function by modulating M2 microglial polarization at least in part through Shc1/PI3K/Akt signaling in a rat model of SAH. The apoE-mimic peptide COG1410 may serve as a promising treatment in the management of SAH patients. Keywords: Subarachnoid hemorrhage, White matter injury, apoE, LRP1, Microglia
