Intracellular Targeting of Calmodulin mRNAs in Primary Hippocampal CellsElod Kortvelya, Szilvia Varszegia, Arpad Palfia, and Karoly Gulyaaa Department of Zoology and Cell Biology, University of Szeged, Szeged, Hungary Correspondence to: Karoly Gulya, Dept. of Zoology and Cell Biology, University of Szeged, 2 Egyetem St., POB 659, Szeged H-6722, Hungary. E-mail: gulyak@bio.u-szeged.hu We investigated the intracellular distribution of the mRNAs corresponding to the three non-allelic CaM genes in cultured hippocampal cells by in situ hybridization with digoxigenin-labeled gene-specific riboprobes. In neurons the perikaryon was heavily stained and strong dendritic mRNA targeting was detected for all three CaM genes. The color labeling exhibited a punctate distribution, suggesting that CaM mRNAs are transported in RNA granules. Immunocytochemistry for S100 demonstrated that glial cells express CaM mRNAs at a very low level. A minority of the cultured cells were negative for either labeling. (J Histochem Cytochem 51:541544, 2003) Key Words: calmodulin, mRNA localization, hippocampal cell culture, S100 immunocytochemistry, dendritic, intracellular
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