Dickens, JA;
Ordonez, A;
Chambers, JE;
Beckett, AJ;
Patel, V;
Malzer, E;
Dominicus, CS;
... Marciniak, SJ; + view all
(2016)
The endoplasmic reticulum remains functionally connected by vesicular transport after its fragmentation in cells expressing Z-alpha(1)-antitrypsin.
FASEB Journal
, 30
(12)
pp. 4083-4097.
10.1096/fj.201600430R.
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Abstract
α1-Antitrypsin is a serine protease inhibitor produced in the liver that is responsible for the regulation of pulmonary inflammation. The commonest pathogenic gene mutation yields Z-α1-antitrypsin, which has a propensity to self-associate forming polymers that become trapped in inclusions of endoplasmic reticulum (ER). It is unclear whether these inclusions are connected to the main ER network in Z-α1-antitrypsin-expressing cells. Using live cell imaging, we found that despite inclusions containing an immobile matrix of polymeric α1-antitrypsin, small ER resident proteins can diffuse freely within them. Inclusions have many features to suggest they represent fragmented ER, and some are physically separated from the tubular ER network, yet we observed cargo to be transported between them in a cytosol-dependent fashion that is sensitive to N-ethylmaleimide and dependent on Sar1 and sec22B. We conclude that protein recycling occurs between ER inclusions despite their physical separation.—Dickens, J. A., Ordóñez, A., Chambers, J. E., Beckett, A. J., Patel, V., Malzer, E., Dominicus, C. S., Bradley, J., Peden, A. A., Prior, I. A., Lomas, D. A., Marciniak, S. J. The endoplasmic reticulum remains functionally connected by vesicular transport after its fragmentation in cells expressing Z-α1-antitrypsin.
| Type: | Article |
|---|---|
| Title: | The endoplasmic reticulum remains functionally connected by vesicular transport after its fragmentation in cells expressing Z-alpha(1)-antitrypsin |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1096/fj.201600430R |
| Publisher version: | http://dx.doi.org/10.1096/fj.201600430R |
| Language: | English |
| Additional information: | © The Author(s). This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | Science & Technology, Life Sciences & Biomedicine, Biochemistry & Molecular Biology, Biology, Cell Biology, Life Sciences & Biomedicine - Other Topics, Er Stress, Homotypic Fusion, Serpin, Snare, Unfolded Protein Response, Nf-Kappa-B, Alpha(1)-Antitrypsin Deficiency, Mammalian-Cells, Russell Bodies, Er, Alpha-1-Antitrypsin, Accumulation, Polymers, Fusion |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > VP: Health |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1517631 |
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