Abstract
The mechanisms of neurodegeneration that result in human immunodeficiency virus (HIV) type 1 dementia have not yet been identified. Here, we report that HIV-infected macrophages secrete the zymogen matrix metalloproteinase-2 (MMP-2), which is activated by exposure to MT1-MMP on neurons. Stromal cell–derived factor 1α (SDF-1), a chemokine overexpressed by astrocytes during HIV infection, was converted to a highly neurotoxic protein after precise proteolytic processing by active MMP-2, which removed the N-terminal tetrapeptide. Implantation of cleaved SDF-1(5–67) into the basal ganglia of mice resulted in neuronal death and inflammation with ensuing neurobehavioral deficits that were abrogated by neutralizing antibodies to SDF-1 and an MMP inhibitor drug. Hence, this study identifies a new in vivo neurotoxic pathway in which cleavage of a chemokine by an induced metalloproteinase results in neuronal apoptosis that leads to neurodegeneration.
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Acknowledgements
This work is dedicated to the memory of I. Clark-Lewis (1955–2002). We thank J. Ethier, S. Henry and A. Hood for technical assistance and V.W. Yong and S. Robbins for helpful discussions. K.Z. is a Henri Toupin Medical Foundation Fellow. G.A.M. was supported by a National Cancer Institute of Canada studentship and J.B.J. was supported by an Alberta Heritage Foundation for Medical Research (AHFMR) studentship. I.C.L. was a Canadian Institutes of Health Research (CIHR) Investigator. C.M.O. holds a Canada Research Chair in Metalloproteinase Biology. C.P. is an AHFMR Scholar/CIHR Investigator. These studies were supported by the CIHR, Canadian Arthritis Network of Centers of Excellence, and Canadian Foundation for AIDS Research.
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Zhang, K., McQuibban, G., Silva, C. et al. HIV-induced metalloproteinase processing of the chemokine stromal cell derived factor-1 causes neurodegeneration. Nat Neurosci 6, 1064–1071 (2003). https://doi.org/10.1038/nn1127
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DOI: https://doi.org/10.1038/nn1127