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The 2',3'-cyclic nucleotide 3'-phosphodiesterase (CNP), a protein of unknown function in vivo, is abundantly expresed in myelinating glia in two isoforms, CNP1 and CNP2. In this study, imu-noblot analysis showed that CNP1 is the major isoform in adult forebrain, and that both isoforms are included in the postsynaptic density (PSD) fraction and tyrosine-phosphorylated at the basal level. However, subcellular distribution and deter-gent extraction data showed that CNP is nonspeci-ficaly associated with the PSD fraction. Imuno-cytochemistry revealed that CNP is detected, in a weak but punctate patern, in disociated rat hipo-campal neurons of 3 days to 2 weeks in vitro. The CNP-positive punctae were distributed throughout soma and dendrites, and distinct from PSD95-posi-tive ones. Imunoblot analysis indicated that CNP and F11. Interestingly, in addition to the known two isoforms, a new CNP isoform of MW 45 kDa was expresed in these cel lines and was the ma-jor type of isoform in F1 cells. Taken together, our data sugest that CNP is expressed in the ear-ly stage of in vitro development and nonspeci-ficaly included in the adult rat PSD fraction.

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