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• W2014340217 abstract "Monoamine-activated α2-macroglobulin (α2M) has recently been shown to inhibit the growth and survival of cholinergic neurons of the basal forebrain (Liebl and Koo: J Neurosci Res 35:170–182, 1993). The mechanism of this inhibitory effect is believed to involve the regulation of growth factor activities by α2M. The objectives of this study are to determine whether monoamine-activated α2M can inhibit choline acetyltransferase (ChAT) activity of cholinergic basal forebrain neurons, and whether some common neurotrophins in the CNS can reverse the inhibition. This study demonstrates that both methylamine-activated α2M (MA-α2M) and serotonin-activated α2M (5HT-α2M) can dose-dependently suppress the expression of normal basal levels of ChAT activity in embryonic rat basal forebrain cells in vitro, while normal α2M has little or no effect. As little as 0.35 μM monoamine-activated α2M can suppress the ChAT activity, whereas either nerve growth factor (NGF) or brain-derived neurotrophic factor (BDNF), but not neurotrophin-3 (NT-3), stimulates ChAT expression of these cells. The addition of either NGF or BDNF to the α2M-suppressed cells can increase ChAT activity back to its normal levels, while NT-3 can not. These results demonstrate that (1) monoamine-activated α2M is a potent non-cytotoxic inhibitor of the ChAT activity in cholinergic basal forebrain neurons, and (2) NGF and BDNF are capable of not only stimulating the ChAT activity but can also specifically reverse the α2M inhibition. The potential physiological role of monoamine-activated α2M and neurotrophins in the degeneration and regeneration of cholinergic neurons is discussed. In addition, we propose that α2M may serve as an important tool for evaluating the roles of growth factors in the nervous system. © 1994 Wiley-Liss, Inc." @default.
• W2014340217 created "2016-06-24" @default.
• W2014340217 creator A5041103765 @default.
• W2014340217 creator A5067425254 @default.
• W2014340217 date "1994-07-01" @default.
• W2014340217 modified "2023-10-12" @default.
• W2014340217 title "Monoamine-activated ?2-macroglobulin inhibits choline acetyltransferase of embryonic basal forebrain neurons and reversal of the inhibition by NGF and BDNF but not NT-3" @default.
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• W2014340217 doi "https://doi.org/10.1002/jnr.490380406" @default.
• W2014340217 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/7523691" @default.
• W2014340217 hasPublicationYear "1994" @default.
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