About the Project
Recent studies from us and others have revealed a key role for the Ca2+-permeable TRPM2 channel in Aβ-induced AD-related neuroinflammation and neurotoxicity (Ostapchenko et al., 2015; Syed Mortadza et al., 2018; Li and Jiang, 2018, Cell Death Dis). The TRPM2 channel is highly expressed in microglial cells and essential for Aβ42-induced microglial activation and generation of TNF-α (Syed Mortadza et al., 2018), a key proinflammatory cytokine strongly implicated in AD pathogenesis. TNF-α is known to act as an autocrine/paracrine signal in inducing microglial activation and neuronal death and thus amplify Aβ-induced neuroinflammation and neurotoxicity. Our preliminary study suggests a role for the TRPM2 channel in both TNF-α induced microglial activation and neurodegeneration. This PhD project aims to investigate the mechanisms by which the TRPM2 channel mediates the dual (microglial and neuronal) signalling roles of TNF-α in Aβ-induced neuroinflammation and neurodegeneration.
Specifically, the project will use multiple techniques that are well established in our lab (Ye et al., 2015; Jiang et al., 2017; Li et al., 2017; Syed Mortadza et al., 2017, 2018; Li and Jiang, 2018), including patch-clamp recording, singe cell imaging, real-time RT-PCR, immunofluorescent microscopy, western blotting, ELISA, and cell death assay, and combine with genetic and pharmacological interventions to address the following:
(1) The signalling mechanisms by which TNF-α activates the TRPM2 channel in microglial cells, leading to microglial activation and generation of proinflammatory mediators (IL-1β, TNF-alpha and ROS) following exposure of wild-type (WT) and TRPM2-knockout (TRPM2-KO) microglial cells to TNF-α;
(2) The signalling mechanisms by which TNF-α activates the TRPM2 channel in hippocampal neurons, resulting in neurotoxicity in WT and TRPM2-KO hippocampal neurons, including synaptic loss, axon degeneration and neuronal death induced by TNF-α;
(3) The role of the TRPM2 channel in mediating contribution of Aβ-induced neuroinflammation by generation of TNF-α, by examining neurotoxicity in WT hippocampal neurons induced by culture media conditioned by WT or TRPM2-KO microglial cells that are prior exposed to Aβ42.
This study is anticipated to provide novel insights into the mechanisms underlying Aβ-induced AD-related neuroinflammation and neurotoxicity.
 Selkoe, D.J. and Hardy, J. (2016) EMBO Mol Med 8:595.
 Wes, P.D., Sayed, F.A., Bard, F. and Gan, L. (2016) Glia 64:1710.
 Colonna, M. and Butovsky, O. (2017) Ann Rev Immunol 35: 441.
 Wolf, S.A., … and Kettenmann, H. (2017) Ann Rev Physiol 79:619.
 Ostapchenko, V.G., … and Jackson, M.F. (2015) J Neurosci 35: 15157.
 Ye, M.,…Luo, J.H. and Jiang, L.-H. (2014) Cell Death Dis 5:e1541.
 Syed Mortadza, S., … and Jiang, L.-H. (2017) Sci Rep 7:45032.
 Jiang, Q., …, Jiang, L.-H., Yang, W. and Han, F. (2017) Antioxid Redox Signal 27:1297.
 Li, X., Yang, W. and Jiang, L.-H. (2017) Front Mol Neurosci 10:414
 Syed Mortadza, S.A., … and Jiang, L.-H. (2018) Glia 66:562.
 Li, X. and Jiang, L.-H. (2018) Cell Death & Disease 9:195
Candidates should have, or be expecting, a 2.1 or above at undergraduate level in a relevant field. If English is not your first language, you will also be required to meet our language entry requirements. The PhD is to start in October 2021.
Instructions on submitting an application are available on the following webpage: https://biologicalsciences.leeds.ac.uk/research-degrees/doc/how-to-apply
 Syed Mortadza, S., Sim, J.A., Stacey, M. and Jiang, L.-H. (2017) Signalling mechanisms mediating Zn2+-induced TRPM2 channel activation and death cell in microglial cells. Scientific Reports 7: 45032
 Jiang, Q., Gao, Y., Wang, C., Liao, M., Wu, Y., Zhan, K., Lu, N., Tao, R., Lu, Y., Wilcox, C.S., Luo, J., Jiang, L.-H., Yang, W. and Han, F. (2017) Nitration of TRPM2 as a molecular switch induces autophagy during brain pericyte injury. Antioxidants and Redox Signaling 27:1297-1316
 Li, X., Yang, W. and Jiang, L.-H. (2017) Alteration in intracellular Zn2+ homeostasis as a result of TRPM2 channel activation contributes to ROS-induced hippocampal neuronal death. Frontiers in Molecular Neuroscience 10: 414
[5 Syed Mortadza, S.A., Sim, J.A., Neubrand, V.E. and Jiang, L.-H. (2018) A critical role of TRPM2 channel in Aβ42-induced microglial activation and generation of tumour necrosis factor-α. Glia 66:562-575
[6 Li, X. and Jiang, L.-H. (2018) Multiple molecular mechanisms form a positive feedback loop driving amyloid β42 peptide-induced neurotoxicity via activation of the TRPM2 channel in hippocampal neurons. Cell Death & Disease 9:195
 Jiang, L.-H. et al (2018) The TRPM2 channel nexus from oxidative damage to Alzheimer’s pathologies: an emerging novel intervention target for age-related dementia. Aging Research Review 47:67-79
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