Nerve and epidermal growth factors induce the release of the Alzheimer amyloid precursor from PC 12 cell cultures

Biochemical and Biophysical Research Communications
L M RefoloN K Robakis

Abstract

Antisera against specific sites of the Alzheimer beta Amyloid protein precursor (beta APP) were used to study the effects of nerve and epidermal growth factors on the expression and processing of this protein in PC12 cell cultures. Two major beta APP proteins (140 and 105 kDa) both containing the Kunitz-protease inhibitor insert (KPI), were detected in cell extracts of naive PC12 cells. Treatment of these cultures with nerve growth factor (NGF) induced the release of two beta APP species 125 and 120 kDa, both of which contained the KPI domain and lacked the carboxy-terminal portion of the precursor. The released beta APP contained O-linked sugars. Only one of the released beta APP proteins bound to the lectin Concanavalin A indicating that they differ in their glycosylation. Epidermal growth factor (EGF) also induced the release of beta APP proteins into the culture medium with similar electrophoretic mobilities as those released by NGF.

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Citations

May 1, 1992·Journal of Neuroscience Research·M MizuguchiS U Kim
Oct 1, 1992·Journal of Neuroscience Research·K SambamurtiN K Robakis
Oct 1, 1994·Journal of Neuroscience Research·J A RipellinoN K Robakis
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May 20, 2000·Annals of the New York Academy of Sciences·D K LahiriM R Farlow

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