Infradian Rhythm in Proliferative Activity of a Culture of Embryonic Fibroblast-Like Cells from C57BL/6 Mice

2020 ◽  
Vol 169 (5) ◽  
pp. 714-717
Author(s):  
M. A. Diatroptova ◽  
E. A. Ponomarenko ◽  
M. E. Diatroptov
Keyword(s):  
Proliferative Activity ◽  
Infradian Rhythm ◽  
Embryonic Fibroblast

scholarly journals About 4-day Rhythm of Proliferative Activity of Fibroblast-like Cell Cultures Depends on the Environmental Factor

2021 ◽  
Author(s):  
Marina A. Diatroptova ◽  
Anna M. Kosyreva ◽  
Mikhail E. Diatroptov
Keyword(s):  
Cell Cultures ◽  
Proliferative Activity ◽  
Simultaneous Increase ◽  
Embryonic Cells ◽  
Logarithmic Growth Phase ◽  
Infradian Rhythm ◽  
Cell Proliferative Activity ◽  
Embryonic Fibroblast ◽  
Logarithmic Growth

Abstract A study of the 4-day rhythm of the proliferative activity of the embryonic fibroblast-like cells in the logarithmic growth phase was carried out. It was shown that in cell cultures obtained on different days from embryos of different ages, the phase of the 4-day rhythm coincides. In vitro the maxima of the proliferative activity were consistent with the minima of the motor activity of mice. Freezing the culture for 2 or 6 days does not cause a shift in the phase of the 4-day rhythm of cell proliferative activity compare with the unfreezing culture. That indicates the existence of an external synchronizer, which determines the 4-day infradian rhythm of the proliferative activity of embryonic cells. Then we daily thawed samples of single L-929 culture of mice fibroblast-like cells for 22 and 17 days and researched the dynamics of its proliferative activity. We also showed 4-day rhythm of the simultaneous increase in the number of cells for all thawed samples. Taking into account that deep freezing of a culture leads to the cessation of all life processes, the fact we obtained indicates an exogenous mechanism of the formation of about a 4-day rhythm of the proliferative activity of cell culture.

Dischidia nummularia – a potential plant for cytotoxicity and anti-proliferative activity

2019 ◽  
Author(s):  
M Khalil-ur-Rehman ◽  
EM Pferschy Wenzig ◽  
N Kretschmer ◽  
O Kunert ◽  
F Hofer ◽  
...  
Keyword(s):  
Proliferative Activity

Proliferative activity, p53 expression and apoptosis in pituitary adenomas: relationship to tumor behaviour

2003 ◽  
Vol 111 (06) ◽  
Author(s):  
C Tanase ◽  
E Codorean ◽  
C Ardeleanu ◽  
D Terzea ◽  
G Butur ◽  
...  
Keyword(s):  
Pituitary Adenomas ◽  
Proliferative Activity ◽  
P53 Expression

Some Aspects of the Polyhexamethyleneguanidine Salts Effect on Cell Cultures

2014 ◽  
Vol 1 (1) ◽  
pp. 62-67 ◽  
Author(s):  
M. Mandygra ◽  
A. Lysytsia
Keyword(s):  
Proliferative Activity ◽  
Cell Monolayer ◽  
Eukaryotic Cell ◽  
Culture Methods ◽  
Cellular Processes ◽  
Negative Effect ◽  
Membrane Bound ◽  
Membrane Bound Enzymes ◽  
Anion Type ◽  
Cell Culture Methods

Aim. To investigate the effect of polyhexamethyleneguanidine (PHMG) to eukaryotic cell culture. Methods. The passaged bovine tracheal cells culture (TCC) and primary culture of chicken embryo fi broblasts (FCE) were used in the experiments. TCC and FCE monolayers were treated with aqueous solutions of PHMG chloride or succinate. The method of PHMG polycation adsorption to the cells’ plasma membrane together with microscopy were applied. Results. The dependence of PHMG effect on the eukaryotic cells on the agent concentration, duration of exposure and the anion type has been fi xed. The PHMG concentration of 10 –5 per cent (0.1 μg/ml) never causes degradation of the previously formed cell monolayer, while the higher concentrations damage it. The conditions of the PHMG chloride and succinate’s negative effect on cell proliferation and inhibition of monolayer formation were determined. The hypothesis that under certain conditions PHMG stimulates the proliferative activity of the cells has been confi rmed. Stimulation may be associated with non-specifi c stress adaptation of cells. In this case, it is due to modifi cations of the cell membrane after PHMG adsorption to it. Conclusions. PHMG polycation binds with the membrane’s phosphoglycerides fi rmly and irreversibly. A portion of the lipids are removed from participation in the normal cellular processes at that. At the same time, the synthesis of new lipids and membrane-bound enzymes is probably accelerated. The phospholip ids’ neogenesis acceleration can stimulate mitosis under certain conditions. The obtained results can be used in the biotechnologies.

Evaluation of Proliferative Activity in Oral Squamous Cell Carcinoma by the AgNOR Staining Method

Odonto ◽  
2011 ◽  
Vol 19 (38) ◽  
pp. 115-121
Author(s):  
S.O. Silva ◽  
K.P. Gatto ◽  
J.P. De Carli ◽  
P.H.C. Souza ◽  
C.S. Busin
Keyword(s):  
Squamous Cell Carcinoma ◽  
Oral Squamous Cell Carcinoma ◽  
Cell Carcinoma ◽  
Squamous Cell ◽  
Proliferative Activity ◽  
Staining Method ◽  
Agnor Staining

Cytotoxic Effect of Pseudomonas aurogenosa Protease on Cancer Cells

2019 ◽  
Vol 10 (03) ◽  
Author(s):  
Ghanyia J. Shanyoor ◽  
Fatima R. Abdul ◽  
Nehad A. Taher ◽  
Ihsan A. Raheem
Keyword(s):  
Cell Line ◽  
Normal Cell ◽  
Cytotoxic Effect ◽  
Human Cancer ◽  
Skim Milk ◽  
Exchange Chromatography ◽  
Protease Production ◽  
Normal Cell Line ◽  
Protease Enzyme ◽  
Embryonic Fibroblast

About (20) Pseudomonas rogenosa isolate were experienced for their ability of protease production by calculating the diameter of lysis area after developing on skim milk agar medium (qualitatively ) and the results exhibited that only isolate no (5), was higher isolate for protease making of (26mm) of lysis area. Then, the protein concentration also identified by Bradford method and it was found of 0.16 mg/ ml , then purification was done by using an ion- exchange chromatography with DEAE sephadex G- 100 column and the results showed the presence of 1 peak of enzyme with 50 Kd of molecular weight 2 peaks of other proteins . we tried to investigate the invitro Cytotoxic effect of purified enzyme against two human cancer lines, HeP2 (Human larynx epidermed carcinoma ) , RD ( Rabdo- Sarcoma ) , and one normal cell line Ref ( Rat embryonic fibroblast ) . The cancer and normal cells were treated with different concentrations of protease enzyme ranging from ( 0.05, 0.1, 0.2, 0.4,0.8and 0.16 mg/ml) then incubated for additional 48h at 37C0 and the results showed highest toxicity ( 80.28%) of protease enzyme on RD , moderate cytotoxicity (45.52%) on Hep andslight toxicity ( 37.12% ) on normal cell line (Ref) in a concentration (0.8mg/ml).

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