Simultaneous Purification of Merozoites and Schizonts of Eimeria tenella (Apicomplexa) by Percoll Flotation and Assessment of Cell Viability with a Double Fluorescent Dye Assay

1991 ◽  
Vol 77 (6) ◽  
pp. 989 ◽  
Author(s):  
Johan Geysen ◽  
Jannie Ausma ◽  
Hugo Vanden Bossche
Keyword(s):  
Cell Viability ◽  
Eimeria Tenella ◽  
Fluorescent Dye

scholarly journals Mechanism of a methylxanthine drug theophylline-induced Ca2+ signaling and cytotoxicity in AML12 mouse hepatocytes

2020 ◽  
Vol 9 (6) ◽  
pp. 790-797
Author(s):  
Gwo-Ching Sun ◽  
Wei-Zhe Liang
Keyword(s):  
Endoplasmic Reticulum ◽  
Cell Viability ◽  
Respiratory Diseases ◽  
Fluorescent Dye ◽  
Protective Effects ◽  
Free Medium ◽  
Fura 2 ◽  
Mouse Hepatocytes ◽  
The Impact ◽  
Ca2 Channels

Abstract Theophylline is a methylxanthine drug used in therapy for respiratory diseases. However, the impact of theophylline on Ca2+ signaling has not been explored in liver cells. This study examined whether theophylline affected Ca2+ homeostasis and its related cytotoxicity in AML12 mouse hepatocytes. Cell viability was measured by the cell viability reagent (WST-1). Cytosolic Ca2+ concentration ([Ca2+]i) was measured by the Ca2+-sensitive fluorescent dye fura-2. Theophylline (25–125 μM) induced [Ca2+]i rises and cause cytotoxicity in AML12 cells. This cytotoxic response was reversed by chelation of cytosolic Ca2+ with BAPTA/AM. In Ca2+-free medium, treatment with the endoplasmic reticulum Ca2+ pump inhibitor thapsigargin abolished theophylline-induced [Ca2+]i rises. Conversely, treatment with theophylline also abolished thapsigargin-induced [Ca2+]i rises. However, inhibition of PLC failed to alter theophylline-evoked [Ca2+]i rises. In Ca2+-containing medium, modulators of store-operated Ca2+ channels inhibited 30% of the [Ca2+]i rises, whereas the PKC modulators had no effect. Furthermore, theophylline-induced Ca2+ influx was confirmed by Mn2+-induced quench of fura-2 fluorescence. Together, in AML12 cells, theophylline caused Ca2+-associated cytotoxicity and induced Ca2+ entry through PLC-independent Ca2+ release from the endoplasmic reticulum and PKC-insensitive store-operated Ca2+ channels. BAPTA-AM with its protective effects may be a potential compound for prevention of theophylline-induced cytotoxicity.

3-Dimensional immunolabeling and in situ hybridization detection using fluorescence photooxidation and intermediate-voltage Electron Microscopy

1994 ◽  
Vol 52 ◽  
pp. 164-165
Author(s):  
Thomas J. Deerinck ◽  
Maryann E. Martone ◽  
Varda Lev-Ram ◽  
David P. L. Green ◽  
Roger Y. Tsien ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Reactive Oxygen ◽  
Confocal Laser Scanning Microscope ◽  
Fluorescent Dye ◽  
Confocal Laser ◽  
3 Dimensional ◽  
Voltage Electron ◽  
Dimensional Distribution ◽  
Electron Microscopes ◽  
New Generation

The confocal laser scanning microscope has become a powerful tool in the study of the 3-dimensional distribution of proteins and specific nucleic acid sequences in cells and tissues. This is also proving to be true for a new generation of high contrast intermediate voltage electron microscopes (IVEM). Until recently, the number of labeling techniques that could be employed to allow examination of the same sample with both confocal and IVEM was rather limited. One method that can be used to take full advantage of these two technologies is fluorescence photooxidation. Specimens are labeled by a fluorescent dye and viewed with confocal microscopy followed by fluorescence photooxidation of diaminobenzidine (DAB). In this technique, a fluorescent dye is used to photooxidize DAB into an osmiophilic reaction product that can be subsequently visualized with the electron microscope. The precise reaction mechanism by which the photooxidation occurs is not known but evidence suggests that the radiationless transfer of energy from the excited-state dye molecule undergoing the phenomenon of intersystem crossing leads to the formation of reactive oxygen species such as singlet oxygen. It is this reactive oxygen that is likely crucial in the photooxidation of DAB.

Cytoprotective Effect of Tocotrienol-Rich Fraction and α-Tocopherol Vitamin E Isoforms Against Glutamate-Induced Cell Death in Neuronal Cells

2014 ◽  
Vol 84 (3-4) ◽  
pp. 0140-0151 ◽  
Author(s):  
Thilaga Rati Selvaraju ◽  
Huzwah Khaza’ai ◽  
Sharmili Vidyadaran ◽  
Mohd Sokhini Abd Mutalib ◽  
Vasudevan Ramachandran ◽  
...  
Keyword(s):  
Vitamin E ◽  
Cell Viability ◽  
Neuronal Cells ◽  
Positive Control ◽  
Post Treatment ◽  
Mitochondrial Activity ◽  
Before And After ◽  
Pre Treatment ◽  
Tocotrienol Rich Fraction ◽  
Major Mediator

Glutamate is the major mediator of excitatory signals in the mammalian central nervous system. Extreme amounts of glutamate in the extracellular spaces can lead to numerous neurodegenerative diseases. We aimed to clarify the potential of the following vitamin E isomers, tocotrienol-rich fraction (TRF) and α-tocopherol (α-TCP), as potent neuroprotective agents against glutamate-induced injury in neuronal SK-N-SH cells. Cells were treated before and after glutamate injury (pre- and post-treatment, respectively) with 100 - 300 ng/ml TRF/α-TCP. Exposure to 120 mM glutamate significantly reduced cell viability to 76 % and 79 % in the pre- and post-treatment studies, respectively; however, pre- and post-treatment with TRF/α-TCP attenuated the cytotoxic effect of glutamate. Compared to the positive control (glutamate-injured cells not treated with TRF/α-TCP), pre-treatment with 100, 200, and 300 ng/ml TRF significantly improved cell viability following glutamate injury to 95.2 %, 95.0 %, and 95.6 %, respectively (p < 0.05).The isomers not only conferred neuroprotection by enhancing mitochondrial activity and depleting free radical production, but also increased cell viability and recovery upon glutamate insult. Our results suggest that vitamin E has potent antioxidant potential for protecting against glutamate injury and recovering glutamate-injured neuronal cells. Our findings also indicate that both TRF and α-TCP could play key roles as anti-apoptotic agents with neuroprotective properties.

Assessment of the properties of the essential oil from Ridolfia segetum Moris (Portugal) on cancer cell viability

Planta Medica ◽  
2014 ◽  
Vol 80 (16) ◽  
Author(s):  
J Poças ◽  
M Lemos ◽  
C Cabral ◽  
C Cavaleiro ◽  
MT Cruz ◽  
...  
Keyword(s):  
Essential Oil ◽  
Cell Viability ◽  
Cancer Cell

Effects of novel phenolic chalcone derivatives upon MCF-7 Cell viability

Planta Medica ◽  
2016 ◽  
Vol 81 (S 01) ◽  
pp. S1-S381
Author(s):  
A Hussain ◽  
M Grootveld ◽  
R Arroo ◽  
K Beresford ◽  
K Ruparelia ◽  
...  
Keyword(s):  
Cell Viability ◽  
Chalcone Derivatives ◽  
Mcf 7
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