Phosmet induces up-regulation of surface levels of the cellular prion protein.
Chronic (2 day) exposure of human neuroblastoma cells to the organophosphate pesticide phosmet induced a marked concentration-dependent increase in the levels of PrP present on the cell surface as assessed by biotin labelling and immunoprecipitation. Levels of both phospholipase C (PIPLC)-releasable and non-releasable forms of PrP were increased on the plasma membrane. These increases appear to be due to post-transcriptional mechanisms, since PrP mRNA levels as assessed by Northern blotting were unaffected by phosmet treatment. These data raise the possibility that phosmet exposure could increase the susceptibility to the prion agent by altering the levels of accessible PrP.
Gordon
I
I
Department of Neuroscience, Institute of Psychiatry, London, UK.
Abdulla
E M
EM
Campbell
I C
IC
Whatley
S A
SA
D002462:Cell Membrane / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects*; D006801:Humans; D007306:Insecticides / Q000494:pharmacology*; D007700:Kinetics; D008565:Membrane Proteins / Q000096:biosynthesis; D009447:Neuroblastoma; D010706:Phosmet / Q000494:pharmacology*; D011328:Prions / Q000096:biosynthesis*; D014407:Tumor Cells, Cultured
D007306:Insecticides; D008565:Membrane Proteins; D011328:Prions; D010706:Phosmet