PMID- 8611030 OWN - NLM STAT- MEDLINE DCOM- 19960524 LR - 20191210 IS - 0003-9861 (Print) IS - 0003-9861 (Linking) VI - 326 IP - 2 DP - 1996 Feb 15 TI - Suppression of Alzheimer amyloid precursor protein (APP) expression by exogenous APP mRNA. PG - 243-51 AB - To establish a cell line expressing enhanced levels of beta-amyloid precursor protein (beta-APP), we constructed plasmid DNAs expressing beta-APP-751 mRNA and transfected them into COS-1 cells. Using a modified version of the reverse transcriptase polymerase chain reaction which is RNA sensitive to study the beta-APP iso-RNAs, we have made the unexpected observation that enhanced expression of beta-APP-751 mRNA resulted in a significant reduction of beta-APP-770 and -695 mRNA levels. Suppression of beta-APP-770 and -695 was also observed in cells expressing truncated and chimeric beta-App-751 mRNAs. Similar observations were made in P19 cells expressing a chimeric beta-APP-751 mRNA where endogenous beta-APP-751 mRNA levels also were decreased. Also, suppression of beta-APP-770 and -751 mRNAs was observed in human kidney cells expressing exogenous beta-APP-695 mRNA. FAU - Ramakrishna, N AU - Ramakrishna N AD - NYS Institute for Basic Research in Developmental Disabilities, Staten Island 10314, USA. FAU - Smedman, M AU - Smedman M FAU - Gillam, B AU - Gillam B LA - eng GR - AGO4221/AG/NIA NIH HHS/United States PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Research Support, U.S. Gov't, P.H.S. PL - United States TA - Arch Biochem Biophys JT - Archives of biochemistry and biophysics JID - 0372430 RN - 0 (Amyloid beta-Protein Precursor) RN - 0 (RNA, Messenger) RN - 0 (Recombinant Fusion Proteins) RN - 9007-49-2 (DNA) SB - IM MH - Amyloid beta-Protein Precursor/biosynthesis/*genetics MH - Animals MH - Base Sequence MH - Cell Line MH - Chlorocebus aethiops MH - DNA/genetics MH - Gene Expression MH - Humans MH - Molecular Sequence Data MH - Plasmids/genetics MH - Polymerase Chain Reaction MH - RNA, Messenger/genetics/*metabolism MH - Recombinant Fusion Proteins/biosynthesis/genetics MH - Transfection EDAT- 1996/02/15 00:00 MHDA- 1996/02/15 00:01 CRDT- 1996/02/15 00:00 PHST- 1996/02/15 00:00 [pubmed] PHST- 1996/02/15 00:01 [medline] PHST- 1996/02/15 00:00 [entrez] AID - S0003-9861(96)90072-7 [pii] AID - 10.1006/abbi.1996.0072 [doi] PST - ppublish SO - Arch Biochem Biophys. 1996 Feb 15;326(2):243-51. doi: 10.1006/abbi.1996.0072.