Microglial upregulation of progranulin as a marker of motor neuron degeneration |
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Authors: | Philips Thomas De Muynck Louis Thu Hoai Nguyen Thi Weynants Bea Vanacker Peter Dhondt Joke Sleegers Kristel Schelhaas Helenius J Verbeek Marcel Vandenberghe Rik Sciot Raf Van Broeckhoven Christine Lambrechts Diether Van Leuven Fred Van Den Bosch Ludo Robberecht Wim Van Damme Philip |
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Institution: | Vesalius Research Center, VIB, Leuven, Belgium. |
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Abstract: | Frontotemporal lobar degeneration (FTLD) and amyotrophic lateral sclerosis (ALS) are overlapping neurodegenerative disorders. Mutations in the growth factor progranulin (PGRN) gene cause FTLD, sometimes in conjunction with ALS; such mutations are also observed in some ALS patients. Most PGRN mutations underlying FTLD are null mutations that result in reduced PGRN levels. We investigated PGRN expression in human ALS and in mouse models of motor neuron degeneration. Progranulin plasma or CSF levels in newly diagnosed ALS patients did not differ from those in healthy or disease controls (PGRN mutation-negative FTLD and Alzheimer disease patients). In the mutant SOD1 mouse model of ALS, spinal cord PGRN levels were normal in presymptomatic animals but increased during the degenerative process. This increase in PGRN correlated with enhanced expression of PGRN in microglia. In CSF, PGRN levels were normal in presymptomatic and early symptomatic animals, but with disease progression, a raise in PGRN was detectable. These data indicate that upregulation of PGRN is a marker of the microglial response that occurs with progression in motor neuron diseases. |
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