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http://dx.doi.org/10.11620/IJOB.2021.46.3.119

Expression of vesicular glutamate transporter in transient receptor potential vanilloid 1-positive neurons in the rat trigeminal ganglion  

Han, Hye Min (Department of Anatomy and Neurobiology, School of Dentistry, Kyungpook National University)
Cho, Yi Sul (Department of Anatomy and Neurobiology, School of Dentistry, Kyungpook National University)
Bae, Yong Chul (Department of Anatomy and Neurobiology, School of Dentistry, Kyungpook National University)
Publication Information
International Journal of Oral Biology / v.46, no.3, 2021 , pp. 119-126 More about this Journal
Abstract
Activation of transient receptor potential vanilloid 1 (TRPV1), a calcium permeable channel expressed in primary sensory neurons, induces the release of glutamate from their central and peripheral afferents during normal acute and pathological pain. However, little information is available regarding the glutamate release mechanism associated with TRPV1 activation in primary sensory neurons. To address this issue, we investigated the expression of vesicular glutamate transporter (VGLUT) in TRPV1-immunopositive (+) neurons in the rat trigeminal ganglion (TG) under normal and complete Freund's adjuvant (CFA)-induced inflammatory pain conditions using behavioral testing as well as double immunofluorescence staining with antisera against TRPV1 and VGLUT1 or VGLUT2. TRPV1 was primarily expressed in small and medium-sized TG neurons. TRPV1+ neurons constituted approximately 27% of all TG neurons. Among all TRPV1+ neurons, the proportion of TRPV1+ neurons coexpressing VGLUT1 (VGLUT1+/TRPV1+ neurons) and VGLUT2 (VGLUT2+/TRPV1+ neurons) was 0.4% ± 0.2% and 22.4% ± 2.8%, respectively. The proportion of TRPV1+ and VGLUT2+ neurons was higher in the CFA group than in the control group (TRPV1+ neurons: 31.5% ± 2.5% vs. 26.5% ± 1.2%, VGLUT2+ neurons: 31.8% ± 1.1% vs. 24.6% ± 1.5%, p < 0.05), whereas the proportion of VGLUT1+, VGLUT1+/TRPV1+, and VGLUT2+/TRPV1+ neurons did not differ significantly between the CFA and control groups. These findings together suggest that VGLUT2, a major isoform of VGLUTs, is involved in TRPV1 activation-associated glutamate release during normal acute and inflammatory pain.
Keywords
Transient receptor potential vanilloid 1; Vesicular glutamate transporter; Glutamate; Pain; Trigeminal ganglion;
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