Journal
NEUROBIOLOGY OF DISEASE
Volume 62, Issue -, Pages 286-295Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.nbd.2013.10.009
Keywords
Apoptosis; HIF-1 alpha; Ischemic stroke; Neuronal cell death; Notch
Categories
Funding
- National Research Foundation of Korea [2012R1A2A2A01047551, 2012R1A1A2009093]
- Korea Healthcare technology R&D project from the Korean Government [A092042]
- National Heart Foundation of Australia [G 09B 4272]
- Australian National Health and Medical Research Council [NHMRC APP1008048]
- Australian Research Council Future Fellowship [ARCFT100100427]
- Intramural Research Program of the National Institute on Aging
- National Research Foundation of Korea [2012R1A1A2009093, 2012R1A2A2A01047551] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Ask authors/readers for more resources
Recent findings suggest that Notch-1 signaling contributes to neuronal death in ischemic stroke, but the underlying mechanisms are unknown. Hypoxia inducible factor-1 alpha (HIF-1 alpha), a global regulator of cellular responses to hypoxia, can interact with Notch and modulate its signaling during hypoxic stress. Here we show that Notch signaling interacts with the HIF-1 alpha pathway in the process of ischemic neuronal death. We found that a chemical inhibitor of the Notch-activating enzyme, gamma-secretase, and a HIP-1 alpha inhibitor, protect cultured cortical neurons against ischemic stress, and combined inhibition of Notch-1 and HIP-1 alpha further decreased neuronal death. HIP-1 alpha and Notch intracellular domain (NICD) are co-expressed in the neuronal nucleus, and co-immunoprecipitated in cultured neurons and in brain tissue from mice subjected to focal ischemic stroke. Overexpression of NICD and HIP-1 alpha in cultured human neural cells enhanced cell death under ischemia-like conditions, and a HIP-1 alpha inhibitor rescued the cells. RNA interference-mediated depletion of endogenous NICD and HIP-1 alpha also decreased cell death under ischemia-like conditions. Finally, mice treated with inhibitors of gamma-secretase and HIF-1 alpha exhibited improved outcome after focal ischemic stroke, with combined treatment being superior to individual treatments. Additional findings suggest that the NICD and HIP-1 alpha collaborate to engage pro-inflammatory and apoptotic signaling pathways in stroke. (C) 2013 Elsevier Inc. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available