Multiple forms of beta-amyloid peptide precursor RNAs in a single cell type

• Published in: Neurobiology of aging Vol. 9; no. 4; pp. 333 - 338
• Main Authors: Donnelly, R.J., Rasool, C.G., Bartus, R., Vitek, S., Blume, A.J., Vitek, M.
• Format: Journal Article
• Language: English
• Published: London Elsevier Inc 1988; Elsevier Science
• Subjects: Alzheimer's disease; Amyloid - genetics; Amyloid beta-Protein Precursor; Amyloid peptide precursor RNA; Animals; Base Sequence; Beta amyloid peptide; Biological and medical sciences; Degenerative and inherited degenerative diseases of the nervous system. Leukodystrophies. Prion diseases; Diversity; DNA; DNA sequencing Northern analysis; Humans; Medical sciences; Molecular Sequence Data; Neurology; Nucleic Acid Hybridization; Protein Precursors - genetics; Rats; RNA, Messenger - metabolism; Beta amyloid peptide; Amyloid peptide precursor RNA; DNA sequencing Northern analysis; Alzheimer's disease; Diversity; Chromosomal aberration; Human; Molecular hybridization; Nervous system diseases; Pathophysiology; RNA; Alzheimer disease; Glycoproteins; Down syndrome; Precursor; Northern blotting; Complementary DNA; Blotting assay; Amyloid; Molecular probe; Molecular cloning; Deposition
• ISSN: 0197-4580; 1558-1497
• DOI: 10.1016/S0197-4580(88)80078-2

The longest open reading frames (ORFs) of three different cDNAs ([10, 12, 18, 261, and this report) contain the exact 42 amino acid (aa) sequence of the beta-amyloid peptide (BAP) which is selectively deposited in Alzheimer's diseased (AD) brains. Each of the three cDNAs for the putative amyloid peptide precursor (APP) has been cloned from a different cell type. Using an HL 60 library, we have cloned two of these three APP cDNAs from a single cell type. The sequences of the HL 60 cDNAs are identical to the APP 751 and to the APP 770 forms of APP cDNAs. Northern blots show that oligonucleotide probes drawn from unique regions of the APP 751 and APP 770 cDNAs both hybridize to 4.0 Kilobase (Kb) and to 1.6 Kb APP RNAs from HL 60 cells. In human adult brain, an oligonucleotide probe drawn from the unique region of the APP 751 cDNA hybridizes to a 3.5 Kb APP RNA. However, a DNA probe drawn from the BAP region, which is common to the 695, 751, and 770 forms of APP cDNAs, hybridizes to 3.5, 3.2 and 1.6 Kb APP RNAs. Taken together, these results shgw that at least two forms of APP RNAs can exist within a single cell type and that the diversity of possible APP RNAs and complexity of their expression may have been underestimated. Thus, in addition to identifying the cells which produce BAP, a new challenge consists of determining which form of forms of APP RNAs and hence APP proteins are associated with BAP deposition in AD and Down syndrome (DS).