PMID: 9636224Jun 24, 1998Paper

Antisense oligonucleotides against alpha1E reduce R-type calcium currents in cerebellar granule cells

Proceedings of the National Academy of Sciences of the United States of America
E S Piedras-Rentería, R W Tsien

Abstract

Many neurons of the central nervous system display multiple high voltage-activated Ca2+ currents, pharmacologically classified as L-, N-, P-, Q-, and R-type. Of these current types, the R-type is the least understood. The leading candidate for the molecular correlate of R-type currents in cerebellar granule cells is the alpha1E subunit, which yields Ca2+ currents very similar to the R-type when expressed in heterologous systems. As a complementary approach, we tested whether antisense oligonucleotides against alpha1E could decrease the expression of R-type current in rat cerebellar granule neurons in culture. Cells were supplemented with either antisense or sense oligonucleotides and whole-cell patch clamp recordings were obtained after 6-8 days in vitro. Incubation with alpha1E antisense oligonucleotide caused a 52.5% decrease in the peak R-type current density, from -10 +/- 0.6 picoamperes/picofarad (pA/pF) (n = 6) in the untreated controls to -4.8 +/- 0.8 pA/pF (n = 11) (P < 0.01). In contrast, no significant changes in the current expression were seen in sense oligonucleotide-treated cells (-11.3 +/- 3.2 pA/pF). The specificity of the alpha1E antisense oligonucleotides was supported by the lack of change in estimates of the...Continue Reading

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