Abstract
Various proteins are involved in the generation and maintenance of the membrane complex known as the Golgi apparatus. We have used mutant Chinese hamster ovary (CHO) cell lines Lec4 and Lec4A lacking N-acetylglucosaminyltransferase V (GlcNAcT-V, MGAT5) activity and protein in the Golgi apparatus to study the effects of the absence of a single glycosyltransferase on the Golgi apparatus dimension. Quantification of immunofluorescence in serial confocal sections for Golgi α-mannosidase II and electron microscopic morphometry revealed a reduction in Golgi volume density up to 49 % in CHO Lec4 and CHO Lec4A cells compared to parental CHO cells. This reduction in Golgi volume density could be reversed by stable transfection of Lec4 cells with a cDNA encoding Mgat5. Inhibition of the synthesis of β1,6-branched N-glycans by swainsonine had no effect on Golgi volume density. In addition, no effect on Golgi volume density was observed in CHO Lec1 cells that contain enzymatically active GlcNAcT-V, but cannot synthesize β1,6-branched glycans due to an inactive GlcNAcT-I in their Golgi apparatus. These results indicate that it may be the absence of the GlcNAcT-V protein that is the determining factor in reducing Golgi volume density. No dimensional differences existed in cross-sectioned cisternal stacks between Lec4 and control CHO cells, but significantly reduced Golgi stack hits were observed in cross-sectioned Lec4 cells. Therefore, the Golgi apparatus dimensional change in Lec4 and Lec4A cells may be due to a compaction of the organelle.
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Abbreviations
- GlcNAcT-I:
-
N-acetylglucosaminyltransferase I
- GlcNAcT-V, MGAT5:
-
N-acetylglucosaminyltransferase V
- CHO:
-
Chinese hamster ovary cells
- GlcNAc:
-
N-acetylglucosamine
- Man:
-
Mannose
- L-PHA:
-
Leukoagglutinating Phaseolus vulgaris lectin
- Dig:
-
Digoxigenin
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Acknowledgments
We are grateful to Kelley Moremen for the Golgi α-mannosidase II antibody. This work was supported by the Swiss National Science Foundation (to J. R.) and the National Cancer Institute RO1 36434 (to P. S.) and partially supported by the Albert Einstein Cancer Center NCI PO1 13330 (to P. S.). P. S. thanks Subha Sundaram for technical assistance.
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Dong, Z., Zuber, C., Pierce, M. et al. Reduction in Golgi apparatus dimension in the absence of a residential protein, N-acetylglucosaminyltransferase V. Histochem Cell Biol 141, 153–164 (2014). https://doi.org/10.1007/s00418-013-1146-1
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DOI: https://doi.org/10.1007/s00418-013-1146-1