A1 Refereed original research article in a scientific journal
Resistance of neurofilaments to degradation, and lack of neuronal death and mossy fiber sprouting after kainic acid-induced status epilepticus in the developing rat hippocampus
Authors: Lopez-Picon F, Puusrinen N, Kukko-Lukjanov TK, Holopainen IE
Publisher: ACADEMIC PRESS INC ELSEVIER SCIENCE
Publication year: 2004
Journal: Neurobiology of Disease
Journal name in source: NEUROBIOLOGY OF DISEASE
Journal acronym: NEUROBIOL DIS
Volume: 17
Issue: 3
First page : 415
Last page: 426
Number of pages: 12
ISSN: 0969-9961
DOI: https://doi.org/10.1016/j.nbd.2004.08.004
Abstract
Neurofilament (NF) proteins, the major constituent of intermediate filaments in neurons, have an important role in cellular stability and plasticity. We have now studied the short-term (hours) and long-term (up to 1 week) effects of kainic acid (KA)-induced status epilepticus (SE) on the reactivity of NF proteins, and mossy fiber (MF) sprouting and neuronal death up to 4 weeks in 9-day-old rats. In Western blotting, the expression of the phosphorylation-independent epitopes of NF-L, NF-M, and NF-H rapidly but transiently increased after the treatment, whereas the phosphorylated NF-M remained elevated for 7 days. However, the treatment did not change the immunoreactivity of NF proteins, and no neuronal death or mossy fiber sprouting was detected at any time point. Our findings indicate seizure-induced reactivity of NF proteins but their resistance to degradation, which could be of importance in neuronal survival and may also prevent MF sprouting in the developing hippocampus. (C) 2004 Elsevier Inc. All rights reserved.
Neurofilament (NF) proteins, the major constituent of intermediate filaments in neurons, have an important role in cellular stability and plasticity. We have now studied the short-term (hours) and long-term (up to 1 week) effects of kainic acid (KA)-induced status epilepticus (SE) on the reactivity of NF proteins, and mossy fiber (MF) sprouting and neuronal death up to 4 weeks in 9-day-old rats. In Western blotting, the expression of the phosphorylation-independent epitopes of NF-L, NF-M, and NF-H rapidly but transiently increased after the treatment, whereas the phosphorylated NF-M remained elevated for 7 days. However, the treatment did not change the immunoreactivity of NF proteins, and no neuronal death or mossy fiber sprouting was detected at any time point. Our findings indicate seizure-induced reactivity of NF proteins but their resistance to degradation, which could be of importance in neuronal survival and may also prevent MF sprouting in the developing hippocampus. (C) 2004 Elsevier Inc. All rights reserved.
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