Date of Award
6-1-2012
Document Type
Masters Thesis
Degree Name
M.S.
Organizational Unit
College of Natual Science and Mathematics
First Advisor
John C. Kinnamon, Ph.D.
Second Advisor
Joseph Angleson
Third Advisor
Nancy Lorenzon
Fourth Advisor
Judith Snyder
Fifth Advisor
Dwight Smith
Keywords
Connexin-32, Connexin-43, Electron microscopy, Gap junction, Immunocytochemistry, Taste
Abstract
Studies indicate that ATP is one of the primary neurotransmitters in taste transduction. ATP release occurs from taste cells via specific hemichannels such as pannexin/connexin hemichannels (Huang et al., 2007; Romanov et al., 2007). We hypothesize that Type II (receptor) and possibly Type III (presynaptic) cells release ATP at sites containing pannexin/connexin hemichannels. In this study, we examine the presence of connexin–32–LIR (Like Immunoreactivity) and connexin–43–LIR in rodent taste buds through immunocytochemical analysis and DAB (Di–amino–benzidine) immunoelectron microscopy. We observed that connexin–32–LIR co–localizes with P2X2–LIR in nerve fibers and in a small subset of NCAM–LIR cells. Connexin–32–LIR does not co–localize with α–gustducin–LIR or PLCβ2–LIR. We observed that connexin–43–LIR is present in a subset of PLCβ2–LIR cells and in a subset of α–gustducin–LIR cells. Connexin–43–LIR does not co–localize with NCAM–LIR cells or P2X2–LIR nerve fibers. These results are consistent with our results observed using DAB immunoelectron microscopy. Thus, our results indicate that both connexin–32 is expressed in Type III cells and nerve fibers and connexin–43 is expressed in Type II cells in rodent circumvallate taste buds.
Publication Statement
Copyright is held by the author. User is responsible for all copyright compliance.
Rights Holder
Amanda E. Bond
Provenance
Received from ProQuest
File Format
application/pdf
Language
en
File Size
136 p.
Recommended Citation
Bond, Amanda E., "Connexin-32 and Connexin-43 Immunoreactivity in Rodent Taste Buds" (2012). Electronic Theses and Dissertations. 76.
https://digitalcommons.du.edu/etd/76
Copyright date
2012
Discipline
Neurosciences, Biology