Subcellular distribution of choline acetyltransferase by immunogold electron microscopy in non-neuronal cells: placenta, airways and murine embryonic stem cells.

Abstract:

AIMS:Acetylcholine is synthesized in more or less all mammalian cells. However, little is known about the subcellular location of acetylcholine synthesis. Therefore, in the present experiments the subcellular location of the synthesizing enzyme choline acetyltransferase (ChAT) was investigated by anti-ChAT immunogold electron microscopy in human placenta and airways as well as in a murine embryonic stem cell line (CGR8 cell line). MAIN METHODS:Human tissue was obtained as so-called surplus tissue (after delivery/surgical removal because of lung tumor); the CGR8 stem cell line was cultured under standard conditions. For human tissue a monoclonal mouse anti-ChAT antibody (ab) was used and for the CGR8 cell line a polyclonal goat anti-ChAT ab. Immunogold electron microscopy was applied to identify the subcellular location of ChAT. KEY FINDINGS:In trophoblast cells (placenta) specific anti-ChAT immunogold deposition was found within the cell membrane, microvilli, and caveolae but also within the cytosol, for example associated with intermediate filaments. In addition, immunogold deposition was identified within mitochondria and the nuclear membrane. In airway epithelial cells anti-ChAT immunogold was found particularly within the apical cell membrane, cilia, submucosa, cytosol and nuclear membrane. Likewise alveolar macrophages showed positive anti-ChAT immunogold within the nucleus, nuclear membrane and granula. Also in the CGR8 cell line positive anti-ChAT immunogold was identified within the cell nucleus and cytosol. SIGNIFICANCE:The present experiments demonstrate a wide subcellular distribution of ChAT with particular preference of the cell membrane in human epithelial cells.

journal_name

Life Sci

journal_title

Life sciences

authors

Wessler I,Michel-Schmidt R,Brochhausen C,Kirkpatrick CJ

doi

10.1016/j.lfs.2012.05.012

subject

Has Abstract

pub_date

2012-11-27 00:00:00

pages

977-80

issue

21-22

eissn

0024-3205

issn

1879-0631

pii

S0024-3205(12)00286-X

journal_volume

91

pub_type

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