scholarly journals Visualization of Peroxynitrite-Induced Changes of Labile Zn2+in the Endoplasmic Reticulum with Benzoresorufin-Based Fluorescent Probes

2013 ◽  
Vol 135 (36) ◽  
pp. 13512-13520 ◽  
Author(s):  
Wei Lin ◽  
Daniela Buccella ◽  
Stephen J. Lippard
Keyword(s):  
Endoplasmic Reticulum ◽  
Fluorescent Probes ◽  
Induced Changes

scholarly journals Environmentally induced changes in mitochondria and endoplasmic reticulum of Saccharomyces carlsbergensis yeast.

1976 ◽  
Vol 71 (1) ◽  
pp. 123-135 ◽  
Author(s):  
C H Damsky
Keyword(s):  
Endoplasmic Reticulum ◽  
Surface Density ◽  
Volume Density ◽  
Sharp Reduction ◽  
Inner Mitochondrial Membrane ◽  
Large Fluctuations ◽  
Mitochondrial Volume ◽  
Culture Environment ◽  
Induced Changes

The effects of culture environment on the volume density and surface density of mitochondria and endoplasmic reticulum in a facultative yeast were studied. When compared with cells grown aerobically on a nonrepressive substrate, cells grown in the absence of oxygen showed a sharp reduction in both volume density of mitochondria and surface density of the inner mitochondrial membrane (imm) in the remaining mitochondrial profiles. Use of fermentable (repressive) substrates under aerobic conditions restricted the volume density of mitochondria to a much greater extent than the surface density of imm. The range of mitochondrial volume densities in these experiments was 4-11%. Surface density of endoplasmic reticulum (ER) was sensitive to growth rate and in particular to changes in oxygen tension, showing large fluctuations during both anaerobic and aerobic adaptation. These fluctuations in ER are discussed in relation to the known role of this organelle in lipid metabolism.

Why fluorescent probes for endoplasmic reticulum are selective: an experimental and QSAR-modelling study

2003 ◽  
Vol 78 (6) ◽  
pp. 323-332 ◽  
Author(s):  
J Colston ◽  
Rw Horobin ◽  
F Rashid-Doubell ◽  
J Pediani ◽  
Kk Johal
Keyword(s):  
Endoplasmic Reticulum ◽  
Fluorescent Probes ◽  
Qsar Modelling ◽  
Modelling Study

scholarly journals Endoplasmic reticulum targeting fluorescent probes to image mobile Zn2+

2019 ◽  
Vol 10 (47) ◽  
pp. 10881-10887 ◽  
Author(s):  
Le Fang ◽  
Giuseppe Trigiante ◽  
Rachel Crespo-Otero ◽  
Chris S. Hawes ◽  
Michael P. Philpott ◽  
...  
Keyword(s):  
Endoplasmic Reticulum ◽  
Fluorescent Probes ◽  
Biological Processes ◽  
Er Targeting ◽  
Endoplasmic Reticulum Targeting

Two endoplasmic reticulum (ER) targeting probes were developed to image mobile Zn2+ to help understand Zn2+ related biological processes in the ER.

scholarly journals Target of rapamycin signaling mediates vacuolar fission caused by endoplasmic reticulum stress in Saccharomyces cerevisiae

2015 ◽  
Vol 26 (25) ◽  
pp. 4618-4630 ◽  
Author(s):  
Bobbiejane Stauffer ◽  
Ted Powers
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Endoplasmic Reticulum ◽  
Er Stress ◽  
Intracellular Localization ◽  
Downstream Effectors ◽  
Genome Wide ◽  
Genetic Perturbations ◽  
Response To Stress ◽  
Induced Changes ◽  
Yeast Mutants

The yeast vacuole is equivalent to the mammalian lysosome and, in response to diverse physiological and environmental stimuli, undergoes alterations both in size and number. Here we demonstrate that vacuoles fragment in response to stress within the endoplasmic reticulum (ER) caused by chemical or genetic perturbations. We establish that this response does not involve known signaling pathways linked previously to ER stress but instead requires the rapamycin-sensitive TOR Complex 1 (TORC1), a master regulator of cell growth, together with its downstream effectors, Tap42/Sit4 and Sch9. To identify additional factors required for ER stress–induced vacuolar fragmentation, we conducted a high-throughput, genome-wide visual screen for yeast mutants that are refractory to ER stress–induced changes in vacuolar morphology. We identified several genes shown previously to be required for vacuolar fusion and/or fission, validating the utility of this approach. We also identified a number of new components important for fragmentation, including a set of proteins involved in assembly of the V-ATPase. Remarkably, we find that one of these, Vph2, undergoes a change in intracellular localization in response to ER stress and, moreover, in a manner that requires TORC1 activity. Together these results reveal a new role for TORC1 in the regulation of vacuolar behavior.

Interrelations between the Parasitophorous Vacuole ofToxoplasma gondiiand Host Cell Organelles

2005 ◽  
Vol 11 (2) ◽  
pp. 166-174 ◽  
Author(s):  
Rodrigo Cardoso Magno ◽  
Lorian Cobra Straker ◽  
Wanderley de Souza ◽  
Marcia Attias
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Endoplasmic Reticulum ◽  
Host Cell ◽  
Fluorescent Probes ◽  
Parasitophorous Vacuole ◽  
Laser Scanning Microscopy ◽  
Cell Organelles ◽  
Apical Side ◽  
Transmission Electron

Toxoplasma gondii, the causative agent of toxoplasmosis, is capable of actively penetrating and multiplying in any nucleated cell of warm-blooded animals. Its survival strategies include escape from fusion of the parasitophorous vacuole with host cell lysosomes and rearrangement of host cell organelles in relation to the parasitophorous vacuole. In this article we report the rearrangement of host cell organelles and elements of the cytoskeleton of LLCMK2 cells, a lineage derived from green monkey kidney epithelial cells, in response to infection byT. gondiitachyzoites. Transmission electron microscopy made on flat embedded monolayers cut horizontally to the apical side of the cells or field emission scanning electron microscopy of monolayers scraped with scotch tape before sputtering showed that association of mitochondria to the vacuole is much less frequent than previously described. On the other hand, all parasitophorous vacuoles were surrounded by elements of the endoplasmic reticulum. These data were complemented by observations by laser scanning microscopy using fluorescent probes from mitochondria and endoplasmic reticulum and reinforced by three-dimensional reconstruction from serial sections observed by transmission electron microscopy and labeling of mitochondria and endoplasmic reticulum by fluorescent probes.

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