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Melatonin alters the metabolism of the β-amyloid precursor protein in the neuroendocrine cell line PC12

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Abstract

The deposition of amyloid plaques in brain parenchyma is one of the major pathological hallmarks of Alzheimer’s disease (AD). The amyloid in senile plaques is composed of the amyloid β-peptide (Aβ) of 39–43 amino acid residues derived from a larger β-amyloid precursor protein (βAPP). Soluble derivatives of βAPP (sAPP) lacking the cytoplasmic tail, transmembrane domain, and a small portion of the extracellular domain are generated proteolytically by “secretases.” Using cell cultures, the authors analyzed the level of sAPP in neuroblastoma and pheochromocytoma (PC12) cells by immunoblotting samples from conditioned media and cell lysates. Normal levels of secretion of sAPP into conditioned media were severely inhibited by treating cells with melatonin (3–4 mM). The inhibitory effect of melatonin on the secretion of sAPP can be reversed. When the cells that were pretreated with melatonin for 10 h were washed, the normal level of secretion of sAPP was restored. Northern blot analyses indicated that the treatment of PC12 cells with melatonin resulted in a significant decrease in the level of mRNA encoding βAPP, β-actin, and glyceraldehyde-3-phosphate dehydrogenase, and that the treatment of a human neuroblastoma cell line with melatonin resulted in no change in levels of these messages. The secretion of sAPP into the conditioned medium was substantially reduced in the differentiated cells similar to reductions observed in melatonin-treated undifferentiated PC12 cells. Melatonin was found to potentiate the nerve growth factor-mediated differentiation in PC12 cells at 24 h. Taken together, these data suggest that melatonin regulates the metabolism of βAPP and other housekeeping genes in a cell-type specific manner, and that melatonin accelerates the early process of neuronal differentiation.

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  1. Weihong Song

    Present address: Department of Neurology, Children’s Hospital, Harvard Medical School, 300 Longwood Avenue, 02115, Boston, MA

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  1. Laboratory of Molecular Neurogenetics, Program In Medical Neurobiology, Institute of Psychiatric Research, Department of Psychiatry, Indiana University School of Medicine, 791 Union Drive, 46202, Indianapolis, IN

    Weihong Song & Debomoy K. Lahiri

  2. Medical and Molecular Genetics, Indiana University School of Medicine, 791 Union Drive, 46202, Indianapolis, IN

    Debomoy K. Lahiri

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Song, W., Lahiri, D.K. Melatonin alters the metabolism of the β-amyloid precursor protein in the neuroendocrine cell line PC12. J Mol Neurosci 9, 75–92 (1997). https://doi.org/10.1007/BF02736852

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