Heidi J Clarris

Learn More
The chondroitin sulfate proteoglycans neurocan and phosphacan are believed to modulate neurite outgrowth by binding to cell adhesion molecules, tenascin, and the differentiation factors heparin-binding growth-associated molecule and amphoterin. To assess the role of these chondroitin sulfate proteoglycans in the olfactory system, we describe here their(More)
Each primary olfactory neuron stochastically expresses one of approximately 1000 odorant receptors. The total population of these neurons therefore consists of approximately 1,000 distinct subpopulations, each of which are mosaically dispersed throughout one of four semi-annular zones in the nasal cavity. The axons of these different subpopulations are(More)
Recent studies have shown that the binding of the amyloid protein precursor (APP) of Alzheimer's disease to heparan sulfate proteoglycans (HSPGs) can modulate a neurite outgrowth-promoting function associated with APP. We used three different approaches to identify heparin-binding domains in APP. First, as heparin-binding domains are likely to be within(More)
Primary olfactory axons expressing the same odorant receptor gene sort out and converge to fixed sites in the olfactory bulb. We examined the guidance of axons expressing the P2 odorant receptor when they were challenged with different cellular environments in vivo. In the mutant extratoes mouse, the olfactory bulb is lacking and is replaced by a(More)
Primary olfactory neurons expressing the same odorant receptor protein typically project to topographically fixed olfactory bulb sites. While cell adhesion molecules and odorant receptors have been implicated in guidance of primary olfactory axons, the postsynaptic mitral cells may also have a role in final target selection. We have examined the effect of(More)
The expression of the amyloid protein precursor (APP) of Alzheimer's disease (AD) was examined in the olfactory system of the developing rat. Two monoclonal antibodies were used to detect APP: Alz-90, which specifically recognizes APP, and 22C11 which recognizes both APP and the structurally related protein APLP-2. Very similar patterns of immunoreactivity(More)
Alzheimer's disease (AD) is characterized by the deposition of amyloid in the extracellular and intracellular compartments of the cerebral cortex. The extracellular amyloid consists of a protein (beta A4) which is derived from a larger precursor, the amyloid protein precursor (APP). Several studies have implicated APP in the regulation of neurite outgrowth(More)
The main olfactory and the accessory olfactory systems are both anatomically and functionally distinct chemosensory systems. The primary sensory neurones of the accessory olfactory system are sequestered in the vomeronasal organ (VNO), where they express pheromone receptors, which are unrelated to the odorant receptors expressed in the principal nasal(More)
The neurexins are a large family of neuronal cell-surface proteins believed to be involved in intercellular signalling and the formation of intercellular junctions. To begin to assess the role of these proteins in the olfactory bulb, we describe here the expression patterns of their transmembrane and secreted ligands, the neuroligins and neurexophilins,(More)
  • 1