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Volume 17, Number 12,
Issue of June 15, 1997
pp. 4722-4733
Copyright ©1997 Society for Neuroscience
RNA Transport in Dendrites: A cis-Acting Targeting
Element Is Contained within Neuronal BC1 RNA
Received Jan. 21, 1997; revised March 28, 1997; accepted March 31, 1997.
Ilham A. Muslimov1,
Elisabetta Santi1,
Peter Homel3,
Sean Perini4,
Dennis Higgins4, and
Henri Tiedge1, 2
Departments of 1 Pharmacology and
2 Neurology, and 3 Scientific/Academic
Computing Center, State University of New York, Health Science Center
at Brooklyn, Brooklyn, New York 11203, and 4 Department of
Pharmacology and Toxicology, State University of New York at Buffalo,
Buffalo, New York 14214
In nerve cells, a select group of RNAs has been localized to
dendritic domains. Here we have examined dendritic RNA transport in
sympathetic neurons in primary culture, using a microinjection protocol
with neuronal BC1 RNA and with BC1-derived sequence segments. After
cytoplasmic microinjection, full-length BC1 RNA was selectively transported to dendrites; in contrast, control RNAs such as nuclear RNAs and random-sequence irrelevant RNAs remained restricted to cytoplasmic areas proximal to the injection sites. Chimeric RNAs were
constructed that contained the full-length BC1 sequence inserted upstream or downstream of the coding regions of nondendritic mRNAs. After microinjection, such chimeric RNAs were specifically targeted to
dendrites; microinjected corresponding nonchimeric mRNAs were not.
Dendritic transport of BC1 RNA was rapid: the average dendritic delivery rate within the first hour after microinjection was 242 ± 25 µm/hr. Whereas a 5 -BC1 segment of 62 nucleotides was
transported to dendrites to extents and at levels similar to
full-length BC1 RNA, a 3 -BC1 segment of 60 nucleotides did not exit
injected somata to any significant degree. A cis-acting
dendritic targeting element is thus contained in the 5 part of
neuronal BC1 RNA. These results demonstrate that mechanisms exist in
neurons for fast and specific transport of selected RNAs to
dendrites.
Key words:
neuronal BC1 RNA;
RNA transport;
dendrites;
targeting
element;
sympathetic neurons;
primary cultures of nerve cells;
microinjection
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