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Transgenic mouse lines expressing synaptopHluorin in hippocampus and cerebellar cortex
Author(s) -
Araki Rikita,
Sakagami Hiroyuki,
Yanagawa Yuchio,
Hikima Takuya,
Ishizuka Toru,
Yawo Hiromu
Publication year - 2005
Publication title -
genesis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.093
H-Index - 110
eISSN - 1526-968X
pISSN - 1526-954X
DOI - 10.1002/gene.20125
Subject(s) - hippocampus , neuroscience , genetically modified mouse , cerebellar cortex , biology , transgene , cortex (anatomy) , cerebellum , genetics , gene
Abstract We generated six transgenic mouse lines in which synaptopHluorin (SpH), one of green fluorescent protein‐based sensors of vesicular exocytosis, was expressed under the control of neuron‐specific Thy‐1.2 promoter. In situ hybridization study revealed that SpH mRNA was expressed in a broad spectrum of brain regions in four of them, whereas in others it was expressed in the specific regions of the hippocampus. In one particular line, SpH immunoreactivity was specifically observed in the mossy fiber presynaptic terminals of both hippocampus and cerebellar cortex. The fluorescence intensity of these presynaptic terminals was somewhat decreased by acidic buffer superfusion and greatly increased by vesicular neutralization of pH, indicating that the SpH molecules are mainly distributed in the synaptic vesicles. The exocytosis‐dependent fluorescence increment was measured upon activation of a single presynaptic terminal. These transgenic lines are expected to facilitate morphological and physiological studies of presynaptic terminals in a variety of regions of the brain. genesis 42:53–60, 2005. © 2005 Wiley‐Liss, Inc.