TY - JOUR

T1 - A neural cell adhesion molecule-derived peptide reduces neuropathological signs and cognitive impairment induced by Abeta25-35

AU - Klementiev, B

AU - Novikova, T

AU - Novitskaya, V

AU - Walmod, P S

AU - Dmytriyeva, O

AU - Pakkenberg, B

AU - Berezin, V

AU - Bock, E

N1 - Keywords: Amyloid beta-Protein; Animals; Antigens, CD11b; Cerebral Cortex; Cognition Disorders; Drug Administration Routes; Glial Fibrillary Acidic Protein; Glycogen Synthase Kinase 3; Hippocampus; Immunohistochemistry; Injections, Intraventricular; Male; Memory, Short-Term; Neural Cell Adhesion Molecules; Neurodegenerative Diseases; Neuroprotective Agents; Neuropsychological Tests; Peptide Fragments; Rats; Rats, Wistar; Scopolamine; tau Proteins

PY - 2007

Y1 - 2007

N2 - By means of i.c.v. administration of preaggregated oligomeric beta-amyloid (Abeta)25-35 peptide it was possible in rats to generate neuropathological signs related to those of early stages of Alzheimer's disease (AD). Abeta25-35-administration induced the deposition of endogenously produced amyloid protein. Furthermore, quantitative immunohistochemistry demonstrated time-related statistically significant increases in amyloid immunoreactivity, tau phosphorylation, microglial activation, and astrocytosis, and stereological investigations demonstrated statistically significant increased neuronal cell death and brain atrophy in response to Abeta25-35. Finally, the Abeta25-35-administration led to a reduced short-term memory as determined by the social recognition test. A synthetic peptide termed FGL derived from the neural cell adhesion molecule (NCAM) was able to prevent or, if already manifest, strongly reduce all investigated signs of Abeta25-35-induced neuropathology and cognitive impairment. The FGL peptide was recently demonstrated to be able to cross the blood-brain-barrier. Accordingly, we found that the beneficial effects of FGL were achieved not only by intracisternal, but also by intranasal and s.c. administration of the peptide. Furthermore, FGL-treatment was shown to inhibit the activity of GSK3beta, a kinase implicated in signaling regulating cell survival, tau phosphorylation and the processing of the amyloid precursor protein (APP). Thus, the peptide induced a statistically significant increase in the fraction of GSK3beta phosphorylated on the Ser9-position, a posttranslational modification known to inhibit the activity of the kinase. Hence, the mode of action of FGL with respect to the preventive and curative effects on Abeta25-35-induced neuropathological manifestations and cognitive impairment involves the modulation of intracellular signal-transduction mediated through GSK3beta.

AB - By means of i.c.v. administration of preaggregated oligomeric beta-amyloid (Abeta)25-35 peptide it was possible in rats to generate neuropathological signs related to those of early stages of Alzheimer's disease (AD). Abeta25-35-administration induced the deposition of endogenously produced amyloid protein. Furthermore, quantitative immunohistochemistry demonstrated time-related statistically significant increases in amyloid immunoreactivity, tau phosphorylation, microglial activation, and astrocytosis, and stereological investigations demonstrated statistically significant increased neuronal cell death and brain atrophy in response to Abeta25-35. Finally, the Abeta25-35-administration led to a reduced short-term memory as determined by the social recognition test. A synthetic peptide termed FGL derived from the neural cell adhesion molecule (NCAM) was able to prevent or, if already manifest, strongly reduce all investigated signs of Abeta25-35-induced neuropathology and cognitive impairment. The FGL peptide was recently demonstrated to be able to cross the blood-brain-barrier. Accordingly, we found that the beneficial effects of FGL were achieved not only by intracisternal, but also by intranasal and s.c. administration of the peptide. Furthermore, FGL-treatment was shown to inhibit the activity of GSK3beta, a kinase implicated in signaling regulating cell survival, tau phosphorylation and the processing of the amyloid precursor protein (APP). Thus, the peptide induced a statistically significant increase in the fraction of GSK3beta phosphorylated on the Ser9-position, a posttranslational modification known to inhibit the activity of the kinase. Hence, the mode of action of FGL with respect to the preventive and curative effects on Abeta25-35-induced neuropathological manifestations and cognitive impairment involves the modulation of intracellular signal-transduction mediated through GSK3beta.

U2 - 10.1016/j.neuroscience.2006.11.060

DO - 10.1016/j.neuroscience.2006.11.060

M3 - Journal article

C2 - 17223274

VL - 145

SP - 209

EP - 224

JO - Neuroscience

JF - Neuroscience

SN - 0306-4522

IS - 1

ER -