Article
Differential addressing of 5-HT1A and 5-HT1B receptors in epithelial cells and neurons
Journal of Cell Science
(1999)
Abstract
The 5-HT1A and 5-HT1B serotonin receptors are expressed in a variety of neurons in the central nervous system. While the 5-HT1A receptor is found on somas and dendrites, the 5-HT1B receptor has been suggested to be localized predominantly on axon terminals. To study the intracellular addressing of these receptors, we have used in vitro systems including Madin-Darby canine kidney (MDCK II) epithelial cells and primary neuronal cultures. Furthermore, we have extended these studies to examine addressing in vivo in transgenic mice. In epithelial cells, 5-HT1A receptors are found on both apical and basolateral membranes while 5-HT1B receptors are found exclusively in intracellular vesicles. In hippocampal neuronal cultures, 5-HT1A receptors are expressed on somatodendritic membranes but are absent from axons. In contrast, 5-HT1B receptors are found on both dendritic and axonal membranes, including growth cones where they accumulate. Using 5-HT1A and 5-HT1B knockout mice and the binary tTA/tetO system, we generated mice expressing these receptors in striatal neurons. These in vivo experiments demonstrate that, in striatal medium spiny neurons, the 5-HT1A receptor is restricted to the somatodendritic level, while 5-HT1B receptors are shipped exclusively toward axon terminals. Therefore, in all systems we have examined, there is a differential sorting of the 5-HT1A and 5-HT1B receptors. Furthermore, we conclude that our in vivo transgenic system is the only model that reconstitutes proper sorting of these receptors.
Keywords
- Intracellular addressing,
- MDCK II cell,
- Hippocampal neuron,
- Striatum,
- Transgenic mouse,
- Axonal transport
Disciplines
Publication Date
1999
Citation Information
Ghavami A, Stark KL, Jareb M, Ramboz S, Segu L, Hen R. Differential addressing of 5-HT1A and 5-HT1B receptors in epithelial cells and neurons. J Cell Sci. 1999;112:967-976.