Date of Award

1-1-2012

Document Type

Thesis

Degree Name

M.S.

Department

Biological Sciences

First Advisor

John C. Kinnamon

Keywords

Connexin-32, Connexin-43, Electron Microscopy, Gap Junction, Immunocytochemistry, Taste

Abstract

Author: Amanda E. Bond

Title: CONNEXIN–32 AND CONNEXIN–43 IMMUNOREACTIVITY IN RODENT

TASTE BUDS

Advisor: Dr. John C. Kinnamon

Degree Date: June 2012

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.

Provenance

Recieved from ProQuest

Rights holder

Amanda Elizabeth Bond

File size

136 p.

File format

application/pdf

Language

en

Discipline

Neurosciences, Biology

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