The human cyclic AMP-specific phosphodiesterase PDE-46 (HSPDE4A4B) expressed in transfected COS7 cells occurs as both particulate and cytosolic species that exhibit distinct kinetics of inhibition by the antidepressant rolipram.

The Journal of Biological Chemistry
Elaine HustonMiles D Houslay

Abstract

Transfection of COS7 cells with a plasmid encoding the human cyclic AMP-specific PDE4A phosphodiesterase PDE-46 (HSPDE4A4B) led to the expression of a rolipram-inhibited PDE4 activity, which contributed approximately 96% of the total COS cell PDE activity. A fusion protein was generated which encompassed residues (788-886) at the extreme C terminus of PDE-46 and was used to generate an antiserum that detected PDE-46 in transfected COS7 cells. Immunoblotting studies identified PDE-46 as a approximately 125-kDa species that was associated with both the soluble and particulate fractions. The relative Vmax of particulate PDE-46 was approximately 56% that of cytosolic PDE-46. Particulate PDE-46 was not solubilized using Triton X-100 or high NaCl concentrations. Immunofluorescence analysis by laser scanning confocal microscopy showed that PDE-46 was located at discrete margins of the cell, indicative of association with membrane cortical regions. The human PDE4A species, h6.1 (HSPDE4A4C), which lacks the N-terminal extension of PDE-46, was found as an entirely soluble species when expressed in COS7 cells. h6.1 was shown to have an approximately 11-fold higher Vmax relative to that of PDE-46. In dose-response studies rolipram inhibite...Continue Reading

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Jun 19, 1998·Cell Biochemistry and Biophysics·M J PerryR J Owens
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