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Volume 16, Number 22,
Issue of November 15, 1996
pp. 7182-7192
Copyright ©1996 Society for Neuroscience
Detection of Ligands in Regions Anatomically Connected to Neurons
Expressing the Eph Receptor Bsk: Potential Roles in Neuron-Target
Interaction
Received April 19, 1996; revised Aug. 19, 1996; accepted Aug. 21, 1996.
Jian-Hua Zhang1,
Douglas P. Cerretti2,
Tian Yu1,
John G. Flanagan3, and
Renping Zhou1
1 Laboratory for Cancer Research, Department of
Chemical Biology, College of Pharmacy, Rutgers University, Piscataway,
New Jersey 08855, 2 Immunex Research and Development
Corporation, Seattle, Washington 98101, and 3 Department of
Cell Biology, Harvard Medical School, Boston, Massachusetts 02115
Neuron-target interaction is a key feature in the
establishment of neuronal networks. However, the underlying mechanism
remains unclear. We have shown that at the time of target innervation,
Bsk, an eph family receptor, is expressed at high levels in several
brain regions including the hippocampus, olfactory bulb, and retina. To
study whether the ligands are expressed in the target tissues, we
investigated the expression of Bsk ligands using a ligand-affinity
probe, Bsk-AP, which consisted of the extracellular domain of Bsk fused
in frame with a human placental alkaline phosphatase. These analyses
showed that the ligands were expressed at high levels in the developing
septum, hypothalamus, olfactory neural epithelium, and tectum.
In situ hybridization studies revealed that at least
three different factors were responsible for the Bsk-AP binding. In the
septum, Elf-1, Lerk3 (Efl-2), and AL-1/Lerk7 were transcribed. In the
hypothalamus, AL-1/Lerk7 was the ligand detected by Bsk-AP. In the
olfactory system, high levels of Lerk3 were detected in the sensory
neurons. Both Elf-1 and AL-1/Lerk7 were present in the tectum. These
ligand-positive areas are known to be anatomically connected to
Bsk-expressing regions. These observations strongly suggest that Bsk
and the ligands participate in neuron-target interactions in multiple
systems and provide support for their involvement in topographic
projection.
Key words:
brain-specific kinase;
growth factor receptor;
eph
family;
alkaline phosphatase tagging;
neuronal targeting;
topographic
projection
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