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Neuronal pentraxin (NP) is a potential receptor for the snake venom toxin, taipoxin. The highest levels of NP mRNA are found in the cerebellum and the CA3 region of the hippocampus. More specifically, NP mRNA is expressed at high levels in Purkinje and granule neurons of the cerebellum and CA3 neurons of the hippocampus. Moderate levels are present in neurons of the hilus, dentate gyrus, CA1, cerebral cortex, medial habenula, anterior hypothalamic nuclei, olfactory cortex, and inferior olivary nuclei. NP mRNA is not expressed in glia of white or gray matter. It is thought that NP serves as a receptor for taipoxin and, after binding, NP-taipoxin is taken into presynaptic terminals. Alternatively, the binding of taipoxin by NP may represent a nonspecific mechanism to sequester toxins from synapses.
